N MN HCPHN I: TNH TON THIT K H THNG THNG GICHNG I: TNH TON NHIT THAI.Chn thng s tnh ton khng kh bn ngoi v bn trong nh1.a im cng trnh: Nng. 2.Thng s tnh ton ngoi nh. - Nhit tnh ton bn ngoi nh l nhit c trng cho mi a phng m thi gian ko di ca n tng i lu, m nh hng ca n c tc dng mnh n s thay i nhit bn trong nh.a.Ma ng - Nhit tnh ton ngoi nh ma ng l nhit ti thp trung bnh ca thng lnh nht. Theo bng N.2 TCVN 4088-1985 ta tm c ti Nng ctt(D)ngt=18,8 (0C) l nhit ca thng 1 , c m l 85,6% . b.Ma H - Nhit tnh ton ngoi nh ma h l nhit ti cao trung bnh ca thng nng nht. Theo bng N.2 TCVN 4088-1985 ta tm c ti Nng c tt(H)ngt= 34,5 (0C) l nhit ca thng 7, c m l 76,5% .3.Thng s tnh ton trong nh.a.Ma H - Nhit tnh ton trong nh ca ma h c ly cao hn nhit tnh ton ngoi nh ca ma h t 20C-30C, ta chn tt(H)tt= tt(H)ngt+ 1,50C= (34,5+1,5)0C = 36 (0C) b.Ma ng- Nhit tnh ton trong nh ca ma ng c chn theo tin nghi nhit ta chn: tt(D)tt= 22 (0C)+ Theo TCVN 4088 : 1985 .- Bng N .2 Nhit trung bnh ca khng kh (0C)- Bng A.1 m tng i trung bnh ca khng kh (%)- Bng G .2 Vn Tc gi trung bnh (m/s)- Hnh 1.2a Biu I d ca khng kh m( Gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn )- Theo cc s liu thng k ta c bng 1 s liu tnh ton kh hu ti NngBng 1.1 : Thng k cc s liu tnh ton trong v ngoi nh theo hai ma :ttNt

( )0CtttT ( )0C (%) d (g/kg)Ma ng 18,8 22 85,6 12,2Ma h 34,5 36 76,5 18,4Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.511 N MN HCII.Tnh ton h s truyn nhit.1.Kt cu 1.1.Kt cu tng chu lc.+ Kt cu tng chu lc gm ba lp :- Lp 1(va trt mt ngoi) c cc thng s:1 = 15 mm, = 0,65 (kcal/m.h.0C), s = 0,705 (kcal/2m .h.0C).- Lp 2 (tng gch c xy bng va nng) c cc thng s:2 = 220mm, = 0,7 (kcal/m.h.0C), s = 8,3 (kcal/2m .h.0C).- Lp 3(va trt bn trong) c cc thng s:3 = 15 mm, = 0,65 (kcal/m.h.0C), s = 0,705 (kcal/2m .h.0C).1.2.Kt cu ca ra vo v ca s, ca mi,mi.+Caravocutobngthp: c3loi cavolcaravo(4000mm4000mm), Ca s loi 1 (2000mm4000mm), Ca s loi 2 (1000mm2000mm).- Ca ra vo bng thp c cc thng s: = 2 mm , = 49,8 (kcal/m.h.0C)s = 108,5 (kcal/2m .h.0C).+Ca s cu to bng knh : c kch thc1200mm3000mm.- Ca s bng knh c cc thng s = 5mm, = 0,65 (kcal/m.h.0C), s = 9,2 (kcal/2m .h.0C).+Ca mi cu to bng knh cao 1m v chy dc theo chiu di ca nh.- Ca mi bng knh c cc thng s: = 5mm, = 0,65 (kcal/m.h.0C), s = 9,2 (kcal/2m .h.0C).+Mi cu to bng tn Asunam c cc thng s : = 2 mm, = 49,8 (kcal/m.h.0C),s = 108,5 (kcal/2m .h.0C),= 0,65 (kcal/2m.h.0C). - Bn di c mt lp bng thy tinh gi nhit v ma ng c cc thng s: = 10 mm , = 0,05 (kcal/m.h.0C)s = 0,72 (kcal/2m .h.0C).1.3.Kt cu nn.- Nn khng cch nhit v cao hn mt t l 200mm.- Kt cu nn tnh t di ln l: t t nhin, b tng gch v, ct en m cht v lp b tng dy 150mm c h s cch nhit tha m iu kin 1 (kcal/m.h.0C). +Trong :- : B dy lp vt liu (mm).- : H s dn nhit ca vt liu (kcal/m.h.0C).- s : H s hm ca vt liu (kcal/2m.h.0C).- : H s bc x ca kt cu bao che (kcal/2m.h.0C).+ Cc h s ly theo ph lc 2 gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.512 N MN HC2.Kim tra nhit tr yu cu ca kt cu.- Kt cu bao che ngoi yu cu v bn, n nh, kh nng chu la v tui th, to dng kin trc, knh t cn cn phi p ng cc yu cu v nhit k thut. l nhng yu cu v chng lnh cho ma ng, chng nng cho ma h v hin tng ngng t hi nc trn b mt trong kt cu.- T nhng yu cu kt cu bao che c chn da trn tnh cht vt l ca vt liu xy dng v dy ca chng p ng cc tiu chun v nhit tr, y chng ta ch cn quan tm n yu cu chng lnh v ma ng bi v v ma h nc ta nhit b mt cc kt cu hu nh thp hn nhit khng kh v ch cn kim tra cho tng bao v mi.2.1.Xc nh nhit tr ca tng v mi.- Nhit tr ca tng bng tng nhit tr ca cc b mt trong, mt ngoi v ca bn thn kt cu. R0 = RT + RKC + R N = T N + 1 1+ (2m.h.0C/kcal).+Trong : - RT , R N : L nhit tr trong v ngoi ca kt cu. - RKC : L nhit tr ca cc lp kt cu ngn che. - T,N: L h s trao i nhit mt trong v mt ngoi ca kt cu bao che (kcal/2m.h.0C), c ly theo bng 3-2 gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn.- Vi b mt trong ca kt cu T= 7,5(kcal/2m.h.0C). - Vi b mt ngoi ca kt cu N= 20(kcal/2m.h.0C). +Vi kt cu l tng:- i vi kt cu tng tip xc trc tip vi khng kh bn ngoi.101 0,015 0,22 0,015 1 = + + + + 7,5 0,65 0,70 0,65 20R = 0,544 (2m.h.0C/kcal).+Vi kt cu l mi : - i vi kt cu mi tip xc trc tip vi khng kh bn ngoi. m0 1 0,001 0,01= + + + 0,057,5 50 0,05R = 0,383 (2m.h.0C/kcal).2.2.Xc nh nhit tr yu cu ca kt cu.- Tng nhit tr R0 ca kt cu cn phi tha mn cc yu cu iu kin tin nghi nhit v ma ng v iu kin chng ng sng trn b mt trong ca kt cu nh sau: tt ttT Nyc Tbm(-) = t t mR Rt (2m.h.0C/kcal).+Trong : - ttTt: Nhit tnh ton bn trong phn xng (0C). - ttNt : Nhit tnh ton bn ngoi v ma ng dng cho si m (0C). - bmt: Nhit b mt chnh lch cho php (0C). - TR: Nhit tr trong ca tng (2m.h.0C/kcal).Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.513 N MN HC - : H s c k n v tr tng i ca mt ngoi kt cu so vi khng kh ngoi, theo gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn trang 75.- i vi tng hoc mi tip xc vi khng kh bn ngoi =1.- Nu phng m tip xc vi khng kh bn ngoi = 0,7.- Nu phng m khng tip xc vi khng kh bn ngoi =0,4. - m : H s hiu chnh k n nh hng ca nhit qun tnh, c xc nh ph thuc vo ch s qun tnh D ca kt cu bao che.D = 1 1R s+ 2 2R s+3 3R s+ ....... n nR s+Trong : - D : H s nhit qun tnh hay cn gi l dy quy c ca kt cu bao che (khng th nguyn). - 1R,2R,3R......nR : Nhit tr ca tng lp vt liu (2m.h.0C/kcal). - 1s, 2s, 3s........ ns: Nhit tr ca tng lp vt liu (kcal/2m.h.0C).+Vi kt cu l tng.0,015 0,22 0,015D =7,05 +8,3 +7, 050,65 0,70 0,65 = 2,934- Theo gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn trang 86.- Ta c D = 2,934 tng c xem l nh nn m = 1,20.+Vi kt cu l mi. 0,001 0,01D =108 +0,7250 0,05 = 0,146- Theo gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn trang 86.- Ta c D = 0,146 tng c xem l nh nn m = 1,30.+ chnh nhit b mc cho php.- L chnh cho php ti a gia nhit khng kh bn trong phng v nhit mt trong ca kt cu bao che, xc nh t iu kin tin nghi nhit chng lnh v nhit chng ng sng mt trong ca tng i vi loi phng sn xut c m tnh ton bn trong ln hn 60% - 75% khng cho php ng sng b mt trong kt cu.Theo bng 3-4 gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn.- Hiu s nhit bmt = T S-t t+Trong : - Tt : Nhit mt trong ca kt cu bao che v ma ng. - St : Nhit im sng ca khng kh trong nh. - Vi Tt = 22 (0C) v T = 70 (%) tra biu I - d ta c St = 16 (0C).

bmt = T S-t t = 22 - 16 = 6 (0C) - Nh vy ta tnh ton c nhit tr yu cu ca kt cu nh sau:+Vi kt cu l tng.- i vi kt cu tng tip xc trc tip vi khng kh bn ngoi =1.yc0 (22 - 13,3)11,2=0,133 6R = 0,232 (2m.h.0C/kcal).* So snh yc0R= 0,232 < 0R= 0,544 do m bo khng ng sng.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.514 N MN HC+Vi kt cu l mi : i vi kt cu tng tip xc trc tip vi khng kh bn ngoi =1.yc0 (22 - 13,3)11,2=0,133 6R = 0,232 (2m.h.0C/kcal).* So snh yc0R= 0,232 < 0R= 0,383 do m bo khng ng sng.+Kt lun :- Vi c hai kt cu tng v mi u tha mn v cch nhit theo yu cu v nhng trng hp bt li nht v ma ng.3.H s truyn nhit k.- H s truyn nhit k ca kt cu bao che c xc nh theo cng thc tnh.T N01= = + R1k 1 1+ (kcal/2m.h.0C).+Trong :- k : H s truyn nhit ca kt cu bao che, (kcal/2m.h.0C).- 0R: Nhit tr mt trong v mt ngoi ca kt cu (2m.h.0C/kcal).-T: h s trao i nhit trn b mt trong ca kt cu bao che, b mt trong ca tng, sn, trn vi b mt nhn T = 7,5 (kcal/2m .h.0C).- N : h s trao i nhit trn b mt ngoi ca kt cu bao che, b mt tip xc trc tip vi khng kh bn ngoi N = 20 (kcal/2m .h.0C) .- Vi b mt ngoi ca kt cu tip xc vi phng v sinh hoc kho cha th T= N= 7,5(kcal/2m.h.0C). - i : b dy ca lp vt liu th i, (m).- i : h s dn nhit ca lp vt liu th i, (kcal/m.h.0C).+Ring i vi nn khng cch nhit, h s truyn nhit c ly theo trang 90 gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn.- H s truyn nhit k ca kt cu bao che c tnh ton bng 2.2Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.515 N MN HCBng 1.2: H s truyn nhit k ca kt cu bao cheStt Kt cu bao che v cu toCng thc tnhNhit tr 0R(2m.h.0C/kcal)k(kcal/2m.h.0C)T N1 + 1 1+ 1Tng loi 1Tip xc trc tip vi khng kh bn ngoi1 0,015 0,22 0,015 1+ + + +7,5 0,65 0,70 0,65 200,544 1,8382Ca sTip xc trc tip vi khng kh bn ngoi1 0,005 1+ +7,5 0,65 200,191 5,2363Ca ra voTip xc trc tip vi khng kh bn ngoi1 0,002 1+ +7,5 49,8 200,183 5,4644MiTip xc trc tip vi khng kh bn ngoi1 0,001 0,01 1+ + +7,5 50 0,05 200,383 2,6115NnDi 1Di 2Di 3Di 42,551016,70,4000,2000,1000,0604.Din tch truyn nhit. - Din tch truyn nhit c k hiu l F (2m) l din tch truyn nhit tnh theo kt cu bao che.- Ring phn nn chm trong t th c chia lm 3 di c b 2m dc theo tng ngoi ca phng,phn cn li l di th t.+Ch : Din tch ca nn nhng gc nh thuc di I c tnh 2 ln tc l theo c 2 chiu ca hai tng ngoi to nn gc nh.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.516 N MN HCHnh 1.1: Chia di nn* Do phn xng sn xut c din tch nh, tin cho vic tnh ton khng cn chia thnh cc phn xng nh.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.517 N MN HCBng 2.3: Din tch truyn nhit ca kt cu bao che.Stt Hng Kt cu Cng thc tnh F (2m)Phn xng1 BcCa ra vo(2 ca ) 244 32Ca s loi 1(4 ca ) 424 32Ca s loi 2 (6 ca ) 614 24Ca s loi 3(6 ca ) 60,51 3Tng ngoi 5510 91 4592 ng Ca s loi 1(3 ca ) 324 24Ca s loi 2 (3ca ) 314 12Tng ngoi 2610- 38 2223 Nam Ca s loi 1(4 ca ) 424 32Ca s loi 2 (6 ca ) 614 24Ca s loi 3(6 ca ) 60,51 3Tng ngoi 5510 59 4914 Ty Ca ra vo(1 ca ) 144 16Ca s loi 1(2 ca ) 224 16Ca s loi 2 (3 ca ) 314 12Tng ngoi 2610 - 44 2505 Nn Di 1 2622 + 2255 324Di 2 1847 846Di 3 1039 390Di 4 231 326 Mi552 210 3 +574,25.Tnh tn tht nhit qua kt cu.- Do nhit khng kh trong nh thng cao hn ngoi nh nn c s tn tht nhit mt nhit lng t,thQ t trong nh ra ngoi nh v c tnh theo c ng thc: t,th Q = k Ft(kcal/h).+Trong :- k: H s truyn nhit ca kt cu bao che (2 0w/m C) - Theo bng 2.2.- F: Din tch ca kt cu bao che (2m) - Theo bng 2.3.-t : Hiu s nhit tnh ton (0C ) vi tt ttT N=( -) t t t- H l h s c k n v tr tng i ca mt ngoi kt cu so vi khng kh ngoi, theo gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn trang 75.- i vi tng hoc mi tip xc vi khng kh bn ngoi =1.- Nu phng m tip xc vi khng kh bn ngoi =0,7.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.518 N MN HC- Nu phng m khng tip xc vi khng kh bn ngoi =0,4. - Tttt : Nhit tnh ton bn trong nh 22 (0C).- Nttt :Nhit tnh ton bn ngoi nh 18,8(0C).5.1.Tn tht nhit qua kt cu bao che cho ma h.- Tn tht nhit v ma ng c thng k bng 2.4.Bng 2.4 : Tn tht nhit qua kt cu bao che cho Ma ngStt Kt cu k(kcal/2m.h.0C)F(0C)Tttt(0C)Nttt(0C)tt ttT N-t t0C)Dt,thQ(kcal/h)Phn xng 1 Ca s 5,236 182 1 36 34,5 1,51429,42 Ca ra vo 5,464 48 1 36 34,5 1,5393,43 Tng ngoi 1,838 1422 1 36 34,5 1,53920,54 Di 10,400324 1 36 34,5 1,5194,45 Di 20,200846 1 36 34,5 1,5253,86 Di 30,100390 1 36 34,5 1,558,57 Di 40,06032 1 36 34,5 1,52,98 Mi 2,611 574,2 1 36 34,5 1,5 2248,98501,76.Tnh tn tht nhit do a vt liu t ngoi vo.- Nguyn liu trc khi a vo trong phng c nhit khng kh ngoi tri, v vy v ma ng cn cp cho chng mt lng nhit t c nhit khng kh trong phng, cn ma h do chnh lch nhit l b nn b qua v ta ch tnh ton loi nhit ny cho nguyn liu l kim loi m thi, v trong phn xng ny ta quan tm n nguyn liu l st v thp.- Lng nhit tn tht do nung nng nguyn liu c th tnh theo cng thc sau :vl vl c d= -) Q G c (t t (kcal/h)+Trong :- G : lkhi lng nguyn vt liu a vo phng y l st v thp (kg/h).- vlc: T nhit vt liu th vt rn (kcal/kg.h.0C).Theo ph lc 2-2 trang 251 gio trnh Thit K Thng Gi Cng Nghip ca Hong Th Hin nh xut bn xy dng. C vlc= 0,48 (kJ/kg.K) = 0,12 (kcal/kg.h.0C).-ct,dt: Nhit cui cng v nhit ban u ca vt liu (0C), c tnh bng nhit tnh ton bn trong, bn trong v ngoi phng vi ct=22 (0C),dt = 13,3(0C)- : L phn nhit m vt th nhn c, ph thuc vo thi gian sy nng, n gin ta ch xt 1gi u tin, khi lng trao i l ln nht, vi vt liu khi t Bng 2-11gio trnhThng Gi v K Thut X L Kh Thi caTS.Nguyn Duy ng, c = 0,5.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.519 N MN HC- Vi nng sut l 20000 (tn)/nm, mt nm lm vic 300 ngy th khi lng nguyn vt liu a vo phng l.2000024300G = = 2,778 (Tn/h) = 2778 (kg/h)- Tn tht do nung nng nguyn vt liu a t ngoi vo c tnh ton cho ma ng Bng 2.8.Bng 2.8.Tn tht do nung nng nguyn vt liu a t ngoi.Stt Tn kh vc sn xutG(kg)vlc(kcal/kg.h.0C)c d-t t(0C)vlQ(kcal/h)1 Phn xng2778 0,12 3,2 0,5 533,47.Tng tn tht nhit qua kt cu bao che.- Tng kt ton b tn tht do chnh lch nhit bn trong v bn ngoi phn xng, do r gi, nhit b sung v do mt nhit nung nng vt liu mang vo phng c th hin Bng 2.9 sau tnh ton cho c hai ma.Bng 2.9. Tng tn tht nhit qua kt cu bao che c 2 ma.SttKCQVLQt,thQ1 Ma H 8501,7 533,4 9035,1III.Tnh ton ta nhit.1.To nhit do ngi.- Nhit ta do ngi bao gm nhit hin, nhit n v ph thuc vo trng thi lao ng, nhit , vn tc ca khng kh xung quanh v tnh cht gi nhit ca qun o. - Lng nhit hin do conngi ta c xc nh bng cng thc sau :tngQ = Nhq (kcal/h)+Trong :- hq: Lng nhit hin do mt ngi to ra (kcal/h).- N : S ngi trong phn xng.- Nhit trong phn xng l t = 22 (0C) v lao ng trong phn xng l lao ng nng nn.- Tra Bng 2-2 trang 56 gio Trnh K Thut Thng Gi ca Gs.Trn Ngc Chn ta c :t = 25 (0C) q = 80( kcal/h.ngi )t = 30 (0C)q = 45( kcal/h.ngi )- Thc hin ni suy t0= 28 (0C) q = 63 ( kcal/h.ngi )- Nhit ta ra do ngi ch tnh cho ma ng. Ma h th nhit khng kh trong phng thng cao hn 30 0C, ng vi nhit ny lng nhit ta ra thng thp v hu nh khng c.- Lng nhit do ngi ta ra c thng k Bng 2.10.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5110 N MN HCBng 1.10 : To nhit do ngi v Ma ngN (ngi) q (kcal/h.ngi )tngQ (kcal/h)Phn xng 55 63 34652. Ta nhit do thp sng.- Khi thp sng th hu ht nng lng in bin thnh nhit to ra mi trng v lng nhit c tnh theo cng thc:tcsQ= 860 csN (kcal/h)+Trong :- csN : tng cng sut cc thit b chiu sng (kW).- i vinh cng nghip ta ccsN = q F(kW).- q : l cng sut chiu sngq = 18 24 (W/ 2m. Sn) Chn q = 20 (W/ 2m. Sn) = 0,02 (kW/ 2m. Sn) - F : l din tch Chiu sng (2m).- 860 : ng lng nhit ca cng sut in 1(kW) = 860 (kcal/h)+Nhit ta do thp sng c tnh ton Bng 2.11.Bng 2.11 : To nhit do thp sngq (kW/ 2m. Sn)F 2( ) mng lng nhit(kcal)tcsQ(kcal/h)Phn xng 0,02 1430 864 24710,43.Ta nhit do ng c.- Lng nhit tng cng do ng c in v thit b my mc cng ngh chy bng in t trong gian my c xc nh theo cng thc sau :tdcQ = 860dcN 1k 2k31 1- 1 + k _ ,(kcal/h)+Trong :- dcN: Tng cng sut lp t ca ng c (kW).- 1k: H s ti trng ca ng c.- 2k: H s hot ng ng thi cacc ng c. - 3k: H s k n lng nhit c th thi ra ngoi gian my cng vt liu c gia cng hoc lu thng trong thit b. - 860 : ng lng nhit ca cng sut in 1(kW) = 860 (kcal/h)- 1= a - a : H s hiu chnh k n ti trng lm vic ca ng c.- : H s hiu dng ca ng c in, h s ny ly theo s liu katalong ca ng c, trng hp y do khng c s liu katalong, nn c th nhn theo cng sut lpt cangcbngtrang93gioTrnhKThut ThngGica Gs.Trn Ngc Chn.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5111 N MN HC+ Chn cc thng s nh sau:- Vi h s 1k: m1NkN, vi mNl cng sut trung bnh m ng c truyn cho thit b, do khng c s liu c th nn ta c th chn 1k= 0,8 cho tt c cc thit b my mc cng ngh.- Vi h s 3ktheogio Trnh K Thut Thng Gi ca Gs.Trn Ngc Chn trang 93 th i vi cc loi my mc gia cng kim loi v ct gt kim loi ta c th chn 3k= 0,9.- Vi h s a : Ly theo h s 1k th vi 1k= 0,8 th a = 1.- Vi h s : Ph thuc vo cng sut lp t ng c trong phn xng.-Hsa,clybngtrang93gioTrnhKThutThngGica Gs.Trn Ngc Chn.- Ta nhit do ng c v cc thit b my mc c tnh ton cho c 2 ma vi cc h s l nh nhau Bng 2.12.Bng 1.12. Ta nhit do ng c v cc thit b my mc.Thit b in trong phnxngS lngdcN(kW)1k2k3k atdcQ(kcal/h)Phn xng My nn thy lc1 21 0,8 1 0,9 1 0,88 13,3B ti du 2 1,5 0,8 1 0,9 1 0,88 1,9B ti 2 1,50,8 1 0,9 1 0,88 1,9L mui 4 in cc loi 1 2 50 0,8 1 0,9 1 0,9 64,8L mui 4 in cc loi 2 1 40 0,8 1 0,9 1 0,84 24,2L mui in cc 6 in cc 1 55 0,8 1 0,9 1 0,84 33,3L mui thm xianua C1001 85 0,8 1 0,9 1 0,84 51,4L mui chy in 1 100 0,8 1 0,9 1 0,85 61,2L ramH -31 2 26 0,8 1 0,9 1 0,85 31,8L ram bng ti 1 32 0,8 1 0,9 1 0,85 19,6My nh bng 1 6 0,8 1 0,9 1 0,85 3,7My chi sch 1 4 0,8 1 0,9 1 0,88 2,5My mi nhn 1 4,5 0,8 1 0,9 1 0,88 2,9My lm sch li 1 2 0,8 1 0,9 1 0,9 1,3My nn thy lc 8 tn 2 11 0,8 1 0,9 1 0,84 13,3My o cng 2 2 0,8 1 0,9 1 0,84 2,4L bng ti b ti 1 16 0,8 1 0,9 1 0,84 9,7B ti bng ti 1 9 0,8 1 0,9 1 0,85 5,5My ra bng ti 1 6 0,8 1 0,9 1 0,85 3,7L ram bng ti 1 13 0,8 1 0,9 1 0,88 8,2B ti 2 ngn 1 2 0,8 1 0,9 1 0,85 1,2L bung chy inH -12 1 37 0,8 1 0,9 1 0,88 23,4381,2Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5112 N MN HCtdcQ = 860381,2= 327847,8 (kcal/h)4. Xc nh lng nhit ta do sn phm nung nng ngui:- Do khng c s thay i trng thi ca vt liu : tspQ = 0,278cG (dt - ct) (kcal/h)+ Trong :- C: t nhit ca vt liu (kcal/kgoC)-dt: nhit ban u ca vt liu trc khi bt u ngui, 0C-ct: nhit sau khi ngui (ly bng nhit khng kh trong nh), 0C- G: trng lng vt liu chuyn n trong 1 gi , kg/h- : h s k n cng to nhit theo thi gian (= 0,5).Kt qu tnh ton c thng k trong bng 1.13Bng 2.14.Lng nhit to do vt liu nung nng ngui c s chuyn phati cc phn khu lm vic v Ma HH sspG(kg)C(kJ/kg.oC)dt (oC)ct (oC)tspQ (kcal/h)L mui 4 in cc loi 10,278 100 0,48 820 36 0,55230,85L mui 4 in cc loi 20,278 100 0,48 850 36 0,55431,01L mui in cc 6 in cc0,278 100 0,48 930 36 0,55964,77L mui thm xianua C1000,278 100 0,48 830 36 0,55297,57L mui chy in 0,278 100 0,48 700 36 0,5 4430,21L ramH -31 0,278 100 0,48 630 36 0,5 3963,17L bng ti b ti 0,278 1000 0,48 850 36 0,5 5431,01L bung chy in H -120,278 1000 0,4860 6 36 0,54215,37Tng 39963,955.Xc nh lng nhit ta do b- To nhit t b gm hai thnh phn : to nhit t thnh v y b v to nhit t b mt nc ca b-Cu to ca cc b trong phn xng : Kt cu cc b bng btng dy 15 cm v hai lp va trt , mi lp dy 5mm . V th khi tnh ton ta b qua hai lp va trt ny .5.1.MaHa. B Ti Du+ Kch thc b : 21001100850+ Nhit lm vic ca b : 550C+ Th tch b V = 2,11,10,85 = 1,984 (m3)- Nhit ca vng lm vic l: tvlv = 36 0C.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5113 N MN HC- Ta nhn nhit trn b mt bn trong ca thnh b l:tbmt = tb 50C = (55 - 5)0C = 50 0C.+ Gi thit:- Nhit trn b mt ngoi ca thnh b l: tbmn = 45,5 0C- Xc nh h s bc x- Lng nhit to ra t 1 m2 b mt bn ngoi ca b trong 1 gi:q = n (tbmn tvlv), (kcal/m2h) + Trong :- n : h s trao i nhit b mt (kcal/m2h 0C)n = l0,25bmn vlv-) (t t+ qbmn vlv- Ct t4 4bmn vlvT T100 100 1 _ _1 , , 1 ] (kcal/2m.h.oC)+Trong :- l : H s kch thc c trng ,ph thuc vo v tr ca thnh b.i vi mt ng l = 2,2- qC : H s bc x ca vt, ly qCtrang 97 gio Trnh K Thut Thng Gi ca Gs.Trn Ngc Chn ta c qC= 4,2 (kcal/2m.h.0 4K).n = 2,20,25(44,5 - 36) + 4,244,5 - 36 4 4317,5 309100 100 1 _ _ 1 , , 1 ] = 8,92(kcal/2m.h.oC) q = 9,05 (45,5 - 36) = 85,97 (kcal/m2h )- Ta c q, = k (tt - tn)+ Trong : k : h s truyn nhit ca thnh b (kcal/m2h 0C) :

1 41= + k 1 1+ (kcal/2m.h.0C).- Ta c b ch c mt lp b tng ct thp dy 150 (mm) . Do nhit lm vic ca l thp nn ta c th b qua thnh phn (bt) trong khi xc nh (= 0 + bt) = 1,333(kcal/m2h 0C) k = 8,89(kcal/2m .h.0C).- Ta c q, = 8,89(55 45,5) = 84,46(kcal/m2h )+ Ta c q, - q= 85,97 84,46 = 1,51% sai s = 1,51/85,97 = 1,76%Tho mn sai s < 5%.- Do lng nhit to ra trn 1 m2 thnh b :q = kq + q 85,97 + 84,46=2 2= 85,22(kcal/m2h )- Nhit ta ra t thnh v y b+ Nhit ta ra t thnh bthnhtQ= qF = 85,22 2(1,10,85 + 2,10,85)= 463,6 (kcal/h)+ Nhit ta ra t y b - Gi s rng y b khng c t st nn nn c s ta nhit t y b ra bn ngoi mi trng.F = 2,11,1 = 2,31 m2Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5114 N MN HCdtQ = qF = 85,22 2,31 = 196,86 (kcal/h)+ Lng nhit ta do tng v y b :tQ= thnhtQ +dtQ= 463,6 + 196,86 = 660,46 (kcal/h)- Nhit ta b mt t dung dch.- Nhit ta ra t b mt ca dung dch c tnh theo cng thc sau(5, 7 4, 07. ).( )bmddtoa dd xqQ v t t + Fbmdd(kcal/h)+Trong :+ v : Vn tc gi (m/s)- Do b rng b 12 21 1 2N 11 2R s+ ==1 + R S 0,0257,05+ 8,3S = SS 1 + 0,0258,3= 7,903- H s hm nhit b mt bn trong khi dng nhit i t trong ra ngoi:2 2N 1 11N 1R s+ = 1 + R 0,0257,05+ 201 + 0,02520S=14,1622 2S = s v2D= 2,6 >13 332 22T 32R s+ =1+R S 0,0257,05+ 8,3S = SS 1 + 0,0258,3 = 7,903- tr gi ca mi :1 7,5 7,903 =40,5 2, 952 arctg+ arctg157,5+7,05 2 7, 903+ 20 2 _ , = 7,24(gi)* Tnh ton cho ca i :- Do ca i c mt lp vt liu l thp (c 1s = 108,5 (kcal/2m.h.0C), 1D=0,0044- tr gi ca mi :1 7,5 108, 5 =40,5 0, 0044 arctg+ arctg157,5+108,5 2 108,5+ 20 2 _ , = 0,05(gi)+ Nh vy ta thy tr gi ca cc kt cu khc nhan th khc nhau, do khi tnh tng nhit thu do bc x mt tri qua kt cu s khng chnh xc, hn na bc x qua knh tnh ton sau ny li c tr gi bng 0,nh vy ta phi chn mt thi im tnh Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5133 N MN HCton nht nh thin vkt cu m nhit do bc x mt tri l ln nht xt cho trng hp ca knh.Kt cu tha mn iu kin chnh l mi, khi tr gi bng 1,38 gi, trong khi thi im bc x mt tri cc i vo lc 13 gi(theo trc x trn mt bng ), do thi im tnh ton bc x qua ca knh ly lc13 + 0,36 = 13,36 (gi)- Tng ng chng ta ly lc 14 (gi)2.Bc x mt tri truyn qua ca knh - Bc x mt tri xuyn qua ca knh c tnh theo cng thc :kinhbxQ= 1 2 34 bxq KnhF(kcal/h)+Trong :- 1 : H s trong sut ca knh, vi knh mt lp 1= 0,9.- 2: H s mc bn mt knh, vi knh ng mt lp 2= 0,8.-3: H s k n che khut bi khung ca s, vi ca knh thng ng trong khung thp 3= 0,78.- 4: H s che khut bi cc h thng che nng. Vi knh sn trng c c 4= 0,65 0,80 Chn 4 = 0,65Tch cc h s tnh ton 1 2 34= 0,90,80,780,65 = 0,365 Vy kinhbxQ= 0,365bxq KnhF(kcal/h) - bxq: Cng bc x trn mt phng chu bc x ti thi im tnh ton, cng bc x vo thng 7 l bxq (kcal/2m.h). - KnhF: Din tch ca knh chu bc x vo thi im tnh ton (2m).+ Cng bc x bxqly tnh ton cho ca khng phi l trc x xung mt bng na m hi l theo cc hng khc nhau ca ngi nh.Tnh ton cho thng 7 v chn ra gi tr ln nht.- Bc x mt tri truyn vo nh qua ca knh c tnh theo cng thc rt gn sau : kinhbxQ= 0,365bxq KnhF(kcal/h)- V hng ng v hng ty khng c ca s nn ta ch tnh cho hng Bc v hng Nam. Tuy nhin bc x trn mt thng ng hng Nam (ti ph Lin) vo thng 7 khng c s liu nn ta ch tnh cho hng Bc. Do ch c khu Phn xng I v Phn xng II c bc x qua ca knh. Theo bng B.3 TCVN 4088 -1985 th Qung Ninh(ly theo Ph Lin) th bc x mt tri truyn qua ca knh c tnh ton bng 2.23, bng 2.24.Bng 2.23 : Nhit thu do bc x mt tri qua ca s ca Phn xng theo hng Bcs gibxq (kcal/2m.h)1 2 34 KnhF 2( ) mbxKnhQ(kcal/h)6h 60 0,365 91 1992,97h 105 0,365 91 3487,68h 93 0,365 91 3089,09h 63 0,365 91 2092,510h 33 0,365 91 1096,1Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5134 N MN HC11h 15 0,365 91 498,212h 39 0,365 91 1295,413h 33 0,365 91 1096,114h 66 0,365 91 2192,215h 99 0,365 91 3288,316h 114 0,365 91 3786,517h 69 0,365 91 2291,818h 7 0,365 91 232,5Nhit qua ca knh vo lc 16h l ln nht : bxKnhQ= 26439,1 (kcal/h)3.Tng kt nhit thu do bc x mt tri.- Kt qu tnh ton nhit thu do bc x mt tri qua cc kt cu bao che c tng hp bng 2.25.Bng 2.25 : Tng kt nhit thu do bc x mt triStt Tn phn xng sxtbxQ(kcal/hAxbxQ(kcal/h)bxKnhQ (kcal/h)thubxQ(kcal/h)1 Phn xng572,6 6236,5 26439,1 33248,2V.Tng kt nhit tha.- Nhit tha trong phn xng c tnh ton theo cng thc sau :thQ=tQ+thubxQ- t,thQ (kcal/h)- Nhit tha trong phn xng c tnh ton v tng kt bng 2.26.Bng 2.26 : Tng kt nhit tha trong phn xngStt Tn phn xngtQ(kcal/h)thubxQ(kcal/h)t,thQ(kcal/h)thQ(kcal/h)Phn xng I1 Ma ng 549001,9 0 18670,4 530331,52 Ma H 543388,0 33248,2 6786,2 569850Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5135 N MN HCCHNG II: TNH HT CC BI.Tng quan- Ht cc b l ht khng kh b nhim trc tip ngay ti ngun pht sinh ra chng, y l bin php thng gi hiu qu nht i vi cc phn xng sn xut. Nh cc chp ht cc b m kh c hi khng lan ta vo trong phng, xm nhp vo vng lm vic v hiu qu thng gi t c lu lng trao i l nh nht.- Tu thuc vo tng loi phn xng sn xut, tng loi thit b m ta c th b tr tnh ton cc thit b ht cc b khc nhau.- Vi nh my lp rp c khQung Ninh trong c c cc cng ngh trn, ph khun, rt,...v cng ngh nung ta ra rt nhiu nhit, hi kh c v bi. Do bt buc phi trang b cc chp ht bi v hi kh c hi ngay ti ni pht sinh kh thi nguy hi ny, chnh l bin php ht cc b m chng ta xem xt sau y.- C nhiu loi chp ht cc b, mi loi ph hp vi cht thi cng nh cng ngh khc nhau. Tuy nhin nhn chung v cu to chng phi p ng nhng yu cu l:- V tr ta c hi nu c cn phi c chp kn, nu chp ht c ca hoc cn c ca, kch thc ca chng phi ti thiu.- Chp ht khng c cn tr thao tc ca cng nhn hoc lm gim nng sut lao ng.- Cc yu t c hi phi c ht ti v tr pht sinh theo chiu hng chuyn ng t nhin ca chng. Kh v hi nng chuyn ng ln trn, kh lnh v bi chuyn ng xung di. C kh khng kh nng cha c hi cng c th chuyn ng nh ln vng trn ca phn xng.- Chp ht cc b ni chung c th l loi chp kn hon ton, chp na kn v chp h. Chp kn nh t ht kh c, bung ht kh c, chp kn nh hnh ti cc my trn,...l loi c hiu qu nht. Trong trng hp khng th t chp kn, c th dng chp na kn cng nh chp ht mi ua ca l,... y l nhng loi chp ht s dng nhiu nht trong phn xng ny. Do c im ca cng trnh v cng ngh nn thngpdngchpht htkhongcchnhtnhsovivtrngunta. Trng hp ny khng kh xung quanh c th chuyn ng t do t cc pha, do hiu qu thng gi v ht c hi t c vi lu lng khng kh tng i lnII.Tnh ton chp ht cc b .1.Tnh ton ht cc b ti cc b.- Cc b trong phn xng u c nhit cao hn nhit khng kh xung quanh v vy cc b ny thuc loi b nng . Vy ta c cc cng thc tnh ton vi b nng nh sau : + Lu lng ht l thuytxc nh theo cng thc vi trng hp ch c h thng ht.ltL= 13n xq 3xq-T T3600 A lgb3 T _ , (3m/h)+ Trong :- A : H s c trng phu thuc vo cch ht 1 bn hay ht 2 bn.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5136 N MN HC- Ht 1 bn A = 0,35- Ht 2 bn A = 0,50- b: Chiu rng tnh ton (m).- l : Chiu di ca b (m).- g : Gia tc trng trng g = 9,81 (m/2s )- nT, xqT : Nhit tuyt i ca vt liu trong b v khng kh trong phng 0K- : Gc m rng ca lung khng kh khi b ht.- i vi b ng st tng = 2- i vi b ng cnh b khc khng c h thng ht trn thnh = - i vi b ng c lp = 32+ Trong iu kin thc t th khng kh trong phng t nhiu c chuyn ng , ng thi khng kh cn c th b ht vo khe t hai bn thnh ngang ca b . - Cng thc tnh ton chp ht trn thnh da theo gio trnh K Thut Thng gi ca GS.Trn Ngc Chn trang 240.- Cng thc tnh ton.TL= ltLZKTK(3m/h)+ Trong :- ltL: Lu lng ht l thuyt (3m/h).- ZK: H s d tr tnh n nh hng ca gi.-ZK = 1,5 - 1,75 i vi b cha cht t c hai.-ZK = 1,75 - 2 i vi b cha cht c mc c hi cao.- TK: H s tnh n nh hng ca sc ht i vi lung khng kh b ht t hai u ngang ca b. - Trng hp ht mt bn : TK =2b14 l _ ,+- Trng hp ht hai bn : TK =2b18 l _ ,+-Khi ta c cng thc tnh lu lng ht thc t rt gn l : LT = 3600KZKTB (n (tn - txq) b3)1/2(m3/h)+ Trong :- B : hng s c tnh - Ht mt bn : B= 1/22 vHt hai bn :B = 1/15- n : S gc vung gia cc bin ca lung ht . Do b ng st tng n = 1thay s ta c kt qu tnh lu lng ht thc t cho cc b vi b du c b rng l 400mm , b ra bng nc nng co b rng l 700mm ( b axt v b m km ht mt bn thnh cn b ra bng nc nng th ht hai bn thnh ) Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5137 N MN HC- Da vo vn tc v lu lng ht ta chn ng knh D v chp ht l chp ht XAGHI ng c b tr trong ng.2.1.Tnh ton cho Ma ng.Bng Thng k lu lng ht thc t ti cc b B ti du B ti B ti 2 ngn B ti bng tib 1,1 0,8 0,8 0,105l 2,1 1,2 2,0 3,7KZ1,5 1,5 1,5 1,5B 0,045 0,067 0,045 0,045KT1,31 1,29 1,31 1,36n 1 1 1 1tn55 37 37 37txq22 22 22 22TL (3m/h)1600,82 1947,30 882,18 43,55v 7,3 7,0 6,2 1,6D 280 315 225 1002.2.Tnh ton cho Ma H.Bng Thng k lu lng ht thc t ti cc b B ti du B ti B ti 2 ngn B ti bng tib 1,1 0,8 0,8 0,105l 2,1 1,2 2,0 3,7KZ1,5 1,5 1,5 1,5B 0,045 0,067 0,045 0,045KT1,31 1,29 1,31 1,36n 1 1 1 1tn55 37 37 37txq36 36 36 36TL (3m/h)1600,82 333,96 227,78 11,24v 7,3 7,0 6,2 1,6D 280 315 225 100 3.Xc nh kch thc ca chp ht cc l.*Xc nh kch thc ca chp ht trn cc l da theo gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn trang 230 - 231 vi s v cng thc ton cho chp ht kh.- Do cc l nu u c nhit rt cao nn ta chn phng n chp ht lm vic bng sc ht t nhin.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5138 N MN HCHnh 2.7 : Chp ht lm vic bng sc cn t nhin - sc y trng lctrn ming l.+Xc nh kch thc chp.- Xc nh lng nhit i lu to ra t ming l lc trng trong thi gian 15 pht- H s truyn nhit i lu gia thnh l v khng kh xung quanh xc nh theo cng thc sau : 4a xq 2,8 t - t

2 o(kcal / m .h. C)- Lng nhit i lu ta ra t l trong thi gian 1s l:QFt (kcal/s)- Lng khng kh cn ht trong trng hp ny xc nh theo cng thc sau :230L 0,65 QF h (3m/s)+ Trong :- Q : Lng nhit ta ra (kcal/h).- F : Din tch ngun ta (2m).- h : Chiu cao t mp di ca chp n ngun ta kh (m).+ Cng thc ny p dng cho trng hp h < 1,5Ftc l trng hp khng kh b ngun kh nng bc ln cun theo khng ng k v lc tit din ngang ca lung kh bc ln c th xem bng tit din ngang ca ngun ta kh.+Kch thc ng ng thi khng kh:- Chp thot gi cng l mt loi thit b dng thc hin thng gi t nhin trong trng hp nh khng c ca mi.- Ngi ta t chp thot gi trn mi nh, lp trn mt ng ni ng nh ng khi.- p sut tha trong chp thot gi di tc dng ca nhit tha trong phng.N nh th ch ch+p p H ( - ) 2(kG/ m )Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5139 N MN HC+Trong :-thp: p sut tha bn trong ming vo di cng ca ng ni vo chp 2(kG/ m ) v chp ht c t ngay trn mi nn p sut bn trong trc chp. - Nn ly thp = 0,4 2(kG/ m ).-N ch v :Trng lng n v ca khng kh ngoi tri v khng kh trong chp (kg/3m).N1,291,2118,81+273 (kg/3m) v R ch1, 291,194221273 + (kg/3m)-chH: Chiu cao ca chp k c chiu cao ca ng ni (m). - Do chiu cao mi ca phn xng cao 10,0 (m). Nn ming thi chp ht phi c b tr cao hn 1m -2m cho kh thot ra khi phn xng s c khuch tn i xa theo gi. Do l cao khong 1m, chp c t cao hn so vi l l xm v chiu cao ca chp s l y m v chiu cao ca ng ni l nh m.VychH= chh + nh (m)- Ngoi sc ht do nhit tha to ra cn sc ht do gi na v c xc nh bng cng thc sau : 2gg Nvp K 2g2(kG/ m )+ Sc cn thy lc ca chp thot gi gm :1- ming vo ca ng dn n chp.2- Tn tht ma st do ng ni ng.3- Tn tht trong chp thot gi.- Vi K l h s kh ng i vi chp ht tit din trn kiu XAGHI th K = 0,4- Tt c tn tht trn c th biu din theo p sut ng ng vi vn tc trong ng ni l 0v.2gv ch chhdvp ( + + ) 2g2(kG/ m )+Trong :-v,ch: H s sc cn cc b ch ming vo ca ng ni v ca bn thn chp thot gi khi v= 1,2 v ng ng vo c 2 ch ngoc 090 tn tht l 0,7 v tn tht vo l 0,5 v ch= 1,2 i vi chp ht tit din trn kiu XAGHI.- h, d : Chiu cao v ng knh ca on ng ni ng (m).- hd: Tn tht dc ng trn ng ni. + Ta phi c iu kin sau :nhp+gp= 2gv ch chvh( + + ) d 2g 2(kG/ m )Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5140 N MN HC- T ta rt c vn tc gi trong ng ni n chp thot gi l .0v = 4,43 g nhv ch ch+hdp p( + + ) (m/s)3.1.Tnh cho Ma ng.Bng 1: Lu lng khng kh b ht vo chpStt Tn thit btht0Cxqt0C2 o(kcal / m .h. C)F2mQkcal/shm0L(3m/s)1 L mui 4 in cc loai 195 22 8,18 0,391 233,48 1,0 2,142 L mui 6 in cc 95 22 8,18 0,391 233,48 1,0 2,143 L xianua C100 95 22 8,18 0,540 322,46 1,0 2,964 L mui chy in 95 22 8,18 0,700 418,00 1,0 3,835 L ramH -31 95 22 8,18 0,173 103,31 1,0 0,956 L ram bng ti 95 22 8,18 0,36 214,97 1,0 1,977 L bng ti b ti 95 22 8,18 0,600 358,28 1,0 3,288 L bung chy in95 22 8,18 1,040 621,03 1,0 5,699 L mui 4 in cc loai 295 22 8,18 0,299 178,54 1,0 1,64Bng: p sut tha trong chp thot gi di tc dng ca nhit tha trong phng.Stt Tn thit bchh(m)nh(m)chH(m)N(kg/3m)ch(kg/3m)nhp2(kG/ m )1 L mui 4 in cc 1 10 11 1,21 1,194 0,5762 L mui 6 in cc 1 10 11 1,21 1,194 0,5763 L xianua C100 1 10 11 1,21 1,194 0,5764 L mui chy in 1 10 11 1,21 1,194 0,5765 L ramH -31 1 10 11 1,21 1,194 0,5766 L ram bng ti 1 10 11 1,21 1,194 0,5767 L bng ti b ti 1 10 11 1,21 1,194 0,5768 L bung chy in 1 10 11 1,21 1,194 0,576Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5141 N MN HCBng : p sut sc ht ca giStt Tn thit b Kgv(m/s)g(2m/s)N(kg/3m)gp(kG/2m)1 L mui 4 in cc loai 10,4 3,5 9,81 1,21 0,3022 L mui 6 in cc 0,4 3,5 9,81 1,21 0,3023 L xianua C100 0,4 3,5 9,81 1,21 0,3024 L mui chy in 0,4 3,5 9,81 1,21 0,3025 L ramH -31 0,4 3,5 9,81 1,21 0,3026 L ram bng ti 0,4 3,5 9,81 1,21 0,3027 L bng ti b ti 0,4 3,5 9,81 1,21 0,3028 L bung chy in 0,4 3,5 9,81 1,21 0,3029 L mui 4 in cc loai 20,4 3,5 9,81 1,21 0,302Bng : ng knh v vn tc ht ca chpSttTn thit bv hdchch(kg/3m)nhp(kG/2m)gp(kG/2m)0v(m/s)1 L mui 4 in cc loai 11,2 80,020,51,2 1,194 500 0,302 2,462 L mui 6 in cc1,2 80,020,51,2 1,194 500 0,302 2,563 L xianua C100 1,2 80,020,631,2 1,194 630 0,302 2,534 L mui chy in1,2 80,020,711,2 1,194 710 0,302 2,465 L ramH -31 1,2 80,020,3551,2 1,194 355 0,302 2,566 L ram bng ti 1,2 80,020,51,2 1,194 500 0,302 2,537 L bng ti b ti 1,2 80,020,631,2 1,194 630 0,302 2,468 L bung chy in1,2 80,020,81,2 1,194 800 0,302 2,569 L mui 4 in cc loai 21,2 80,020,451,2 1,194 450 0,302 2,53Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5142 N MN HC3.2.Tnh cho Ma H.4.Tnh ton chp ht bi. - Chp ht bi thng l chp kn. Ngoi mc ch ht bi, mt s chp ht ti cc thit b nh my nghin,my sng...cn lm nhim v bo v cng nhn trnh chn thng.4.1.Tang nh bngTa tnh ton chp ht bi cho cc thit b : Tang nh bng , 850 ta dng chp ht bi h vi lu lng l :Lh = 1800D2 = 1800(0,85)2 = 1300,5(m3/h)4.2.My lm sch li- Ta tnh ton chp ht bi cho cc thit b : My lm sch li, 750 ta dng chp ht bi h vi lu lng l :Lh = 1800D2 = 1800(0,75)2 = 1012,5(m3/h)4.3.My mi nhn.theo gio trnh Hng Dn Thit K Thng Gi Nh Cng Nghip Ca Hong Th Hin trang 88 - Lu lng ht : 2503ft /ph trn 12ft din tch b mt h.- Vn tc ti thiu trong ng ht 3500 ft/ph.- Vi 1in = 2,54 cm v 13ft /ph=1,698(3m /h ). Hay L = 1698(3m /h )hL = 1,6982500,850,6 =216,5(m3/h)4.4.Mychi sch.- Lu lng ht : 2503ft /ph trn 12ft din tch b mt h.- Vn tc ti thiu trong ng ht 3500 ft/ph.- Vi 1in = 2,54 cm v 13ft /ph=1,698(3m /h ). Hay L = 1698(3m /h )hL = 1,6982500,850,6 =216,5(m3/h)Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5143 N MN HC III.Thi cc b.- Ht cc b ch c nhim v em mt phn nhit tha t cc ngun to nhiu nhit nhng n khng c tc dng lm mt cho nhng ngi thao tc ti .V vy phng php thi cc b nhm gii quyt vn ny. Phng php ny ch yu b tr cc hoa sen khng kh a khng kh ti t bn ngoi vo phn xng.- Hoa sen khng kh c b tr ti nhng ni c cng bc x cao nh ti cc ca l nung , l nuv cng bc x tc ng ln cng nhn c gi tr t 600 (kcal/2m) tr ln. Coi v tr cng nhn thao tc lun cch l mt khong l = 0,8 (m).- Ta s dng h thng thi mt cc b bng h thng hoa sen khng kh . y l thit b dng to ra lung khng kh c cc thng s cn thit thi trc tip vo v tr lm vic tng i c nh ca ngi cng nhn gn cc ngun ta nhit mnh , c bit l nhng ni c bc x nhit cao nh l nung , l sy - Theo quy nh khi cng bc x nhit ti v tr lm vic vt qu 600 kcal/h th phi b tr h thng hoa sen khng kh - V trong phn xng lm vic c nhiu l c nhit khc nhau nn ta cn phi kim tra thp nu trong l c nhit thp m phi thng gi cc b bng hoa sen khng kh th cc l c nhit cao hn cng phi ht cc b bng hoa sen khng kh .- Nhng do y cc l u c chiu cao thp , ming l u hng ln trn . V vy lng nhit bc x l hng ln trn nn khng nh hng ti nhng ngi cng nhn lm vic , thao tc xung quanh l .V vy trong nhng trng hp ny ta khng cn thit phi b tr hoa sen khng kh cho cc l ny .IV.Tng kt qu trnh x l cc b.- Tng kt ht v thi cc b thng qua vic thng k cc h thng t chc ht cho cc thit b yu cu phi thu trc tip cc cht c hi nh bi, hi kh c, nhit,...- Trong ton b phn xng do c nhiu loi hnh sn xut khc nhau nh cc l nung, l ti, my trn, my bn bi,..nn yu cu phi t chc nhiu h thng ht v thi cc b. Bao gm c ht bi, ht kh c hi, ht nhit... v h thng thi khng kh hoa sen lm mt khu lm vic ca cng nhn lm vic l c nhit cao.- T cc bc tnh ton v s liu tnh ton ti cc khu vc sn xut ta c th a ra c bng tng kt v qu trnh x l cc b ti cc phn xng v n l c s ta tin hnh t chc h thng thng gi chung. Bng 2.28 : Tng kt qu trnh x l cc bStt V tr S lngPhng thc x lhL(3m /h )thL(3m /h )Phn xng 1 My nn thy lc1 0 02 B ti du 2 Chp hi du 1600,82 03 B ti 2 Chp ht nhit, hi nc 1947,30 04 L mui 4 in cc loi 1 2 Chp ht nhit,kh bi 7704 05 L mui 4 in cc loi 2 1 Chp ht nhit,kh bi 5904 06 L mui in cc 6 in1 Chp ht nhit,kh bi 7704 0Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5144 N MN HCcc7 L mui thm xianua C1001 Chp ht nhit,kh bi 10656 08 L mui chy in 1 Chp ht nhit,kh bi 13788 09 L ramH -31 2 Chp ht kh c 3420 010 L ram bng ti 1 Chp ht nhit,kh bi 7092 011 My nh bng 1 Chp ht bi 1300,5 012 My chi sch 1 Chp ht bi 216,5 013 My mi nhn 1 Chp ht bi 216,5 014 My lm sch li 1 Chp ht bi 1012,5 015 My nn thy lc 8 tn 2 0 016 My o cng 2 0 017 L bng ti b ti 1 Chp ht nhit,kh bi 11808 018 B ti bng ti 1 Chp ht nhit,hi nc 43,55 019 B ti 2 ngn 1 Chp ht nhit,hi nc 882,1820L bung chy inH -122 Chp ht nhit,kh bi 20484Tng 130935,970Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5145 N MN HCCHNG III: CN BNG NHIT V CN BNG LU LNGTNH TON LNG THNG GI CHUNGI.Khi qut s thng gi.II.Cn bng nhit v cn bng lu lng . tnh lu lng thng gi chung.1.Phng trnh cn bng nhit.* Nguyn tc tnh.- Tng lng nhit khng khthi mang vo phn xng v lng nhit tha bng tng lng nhit khng kh mang ra khi phn xng trong n v thi gian.- Nu c m h thng thi v n h thng ht, phng trnh cn bng nhit nh sau: m nCBti ti ti th hi hi hi h1 1c L t + Q c L t + Q (kcal/h)+ Trong :- c : T nhit ca khng kh, bng 0,24 (Kcal/kg.0C)- ti, hi : Khi lng ring ca khng kh thi vo v ht ra phn xng ph thuc vo nhit khng kh v c tnh theo cng thc sau:2731, 29273 t +

3(kg/m )- Vi t l nhit ca khng kh tng ng c thng gi, chnh l nhit tng ng tit, hit.- tiL,hiL : Lu lng ca h thng thi th i v ca h thng ht th j 3(m /h).- thQ : Lng nhit tha ca phn xng (kcal/h).- CBhQ: Lng nhit kh do h thng ht cc b trong phn xng(kcal/h).- tit,hit: Nhit khng kh ca h thng thi th i v ca h thng ht th j (0C).2.Phng trnh cn bng lu lng.* Nguyn tc chnh.- Tng lu lng khng kh thi vo phn xng bng tng lu lng khng kh i ra phn xng trong n v thi gian.- Nu c m h thng thi v n h thng ht, phng trnh cn bng nhit nh sau:m nti hi1 1L =L 3(m /h).+ Nhn xt :- Ta c th a phng trnh cn bng nhit v cn bng lu lng v cc phng trnh n gin hn. C C C CB C C C CBt t t t th h h h hcL t + Q +Q = cL t +Q (1)V C CB C CBt t h hL + L = L + L(2) + Trong :- CtL,ChL: Lu lng thi v ht ca cc h thng thng gi chung 3(m /h).- CBtL,CBhL: Lu lng thi, ht cc b 3(m /h).- Ct,Ch: Khi lng ring tng ng ca khng kh thi v ht do h thng thng gi chung 3(kg/m ).Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5146 N MN HC- Ctt: Nhit thi chung (c kh v t nhin ) v C ttt Ntt (0C).- Cht,CBht: Nhit ht chung (c kh v t nhin ) v ht cc b ph thuc vo cao t chp ht, thng chp ht cc b t trong vng lm vic nn CBh vlvtt , cn chp ht chung dt bn trn vng lm vic nn tnh theo cng thc .Cht=vlvt+ (H - 2)(0C)+ Trong : - : l gradien nhit i vi nh cng nghip thng ly = 1- 1,5 0C/m, - Ta ly = 1,1 ( 0C/m) .Theo gio Trnh K Thut Thng Gi ca Gs.Trn Ngc Chn trang 274 vi cng thc 8-28- H l chiu cao ca phn xng t mt sn n trung tm ca ca mi.- vlvt: Nhit vng lm vic (0C)3.Lp h phng trnh cn bng nhit v cn bng lu lng - lu lng thng gi chung.3.1.Tnh ton cho Ma ng.- Tng nhit tha : thQ = 530331,5 (kcal/h)- Tng lu lng ht cc b :CBhL=22104,5 3(m /h)- Ctt= 18,8 (0C) tng ng vi Ct2731, 29273 18,8 + 1,213(kg/m )- CBh vlvtt = 22 (0C) tng ng vi CBh2731, 29273 22 + 1,1943(kg/m )- Mi cch sn 7,2m do : Cht= 22 + 1,1 (10 - 2) = 30,8 (0C) + Tng ng vi : Ch2731, 29273 30,8 + 1,163(kg/m )- T phng trnh cn bng (1) v cn bng lu lng (2) ta c h phng trinh sau : C C C CB C C C CBt t t t th h h h hcL t + Q +Q = cL t +Q (1)V C CB C CBt t h hL + L = L + L(2) + Trong :- thQ = 530331,5 (kcal/h)- nCB CB CB CBh h hi h1Q = c L t= 0,241,194130935,9722 = 825462,2(kcal/h)+ T cc s liu c v tnh ton c thay s vo ta c h phng trnh sau :C Ct h0,241,21 18,8+ 0 + 530331, 5 0,241,16 30,8 L L + 825462,2(1) VC Ct h0L += L+ 130935,97 (2) *Gii h phng trnh (1) v (2)ta c :CtL= 265667,8 3(m /h) v ChL= 134731,9 3(m /h)+ Ta ly lu lng thng gi c kh bng 30%, lu lng thng gi t nhin bng 70% ca lu lng thng gi chung.CKtL = 0,3CtL=0,3265667,8 = 79700,343(m /h)Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5147 N MN HCTNtL = 0,7CtL= 0,7265667,8 = 185967,46 3(m /h)3.2.Tnh ton cho Ma H.- Tng nhit tha : thQ = 569850 (kcal/h)- Tng lu lng ht cc b :CBhL=22104,5 3(m /h)- Ctt= 34,5 (0C) tng ng vi Ct2731, 29273 34,5 + 1,15 3(kg/m )- CBh vlvtt = 34 (0C) tng ng vi CBh2731, 29273 34 +1,147 3(kg/m )- Mi cch sn 10m do : Cht= 34 + 1,1 (10- 2) = 42,8(0C) + Tng ng vi : Ch2731, 29273 42,8 + 1,1153(kg/m )- T phng trnh cn bng (1) v cn bng lu lng (2) ta c h phng trinh sau : C C C CB C C C CBt t t t th h h h hcL t + Q +Q = cL t +Q (1)V C CB C CBt t h hL + L = L + L(2) + Trong :- thQ = 569850(kcal/h)- mCB CB CB CBt t t ti1Q = c L t = 0 (kcal/h)- nCB CB CB CBh h hi h10, 24 1,147 130935, 97 34 Q = c L t 1225497,83 (kcal/h)+ T cc s liu c v tnh ton c thay s vo ta c h phng trnh sau :C Ct h0,241,15 34,5+0 + 569850 = 0,241,115 42,8 L L+1225497,83 (1) VC Ct h+ 0L = L+130935,97 (2)*Gii h phng trnh (1) v (2)ta c :CtL= 437015,13(m /h) v ChL= 306079,13(m /h)+ Ta ly lu lng thng gi c kh bng 30%, lu lng thng gi t nhin bng 70% ca lu lng thng gi chung. CKtL = 0,3CtL=0,3437015,1 = 131104,533(m /h)TNtL = 0,7CtL= 0,7437015,1= 131104,533(m /h)4.Tng kt cn bng lu lng.Bng 2.29 : Tng kt cn bng lu lng cho c 2 ma.Stt Phn xng sn xutCtL3(m /h)ChL3(m /h)CKtL3(m /h)TNtL3(m /h)Phn xng I1 Ma ng 265667,8134731,979700,34 185967,462 Ma H 437015,1 306079,1 131104,53 131104,53Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5148 N MN HCCHNG IV: TNH TON THNG GI T NHINI.Khi qut chung.- Thng gi t nhin trong phn xng l hin tng trao khng kh gia bn trong v bn ngoi nh mt cch c t chc di tc dng tng hp ca nhit tha v gi.- Thng gi t nhin cho php thc hin c qu trnh trao i khng kh vi lu lng rt ln m khng i hi chi ph nng lng. S lu thng khng kh xy ra nh sau : khng kh i vo nhng ca (ca s v ca i) trn tng pha di v thi ra ngoi qua ca mi.+ Cc gi thit tnh ton thng gi t nhin:- Trong iu kin n nh, trng lng ca khng kh vo nh v t ngoi thot ra trong cng n v thi gian phi bng nhau :V RL = L

3(m /h)hay (kg/h)- Lng nhit (hoc nhn t c hi khc) cng vi khng kh vo nh cng vi lng nhit ta ra bn trong nh phi bng lng nhit do khng kh ra mang theo : p p V R thLC t + Q = LC t (kcal/h)- Khng c s lu thng xa trn khng kh gia cc gian.+ Do lng nhit tha ca Ma H ln hn Ma ng nn ta ch tnh ton thng gi t nhin cho Ma H.II.Tnh ton cho Ma H.- Hng gi chnh l hng ng Namv gv = 3,3(m/s) , tn sut 39,5 (%)- V phn xng c a hnh phc tp nn vic tnh ton thng gi t nhin s tnh ton cho tng phn xng nh.1.Tnh ton cho phn xng I.- y l xng sn xut ta ra nhiu nhit nhng ch thao tc ca cng nhn, do m bo iu kin lm vic mt cch tt nht, ta phi thit k mt h thng thi chung c kh cho ton khu sn xut, c bit l ti v tr thao tc ca cng nhn. H thng gm 2 ng ng nm cnh cc tng ca khu sn xut v c chiu cao thch hp so vi mt sn (do phn xng b tr nhiu cu trc nn khng b tr c trn cao trnh nh hng n s lm vic ca cu trc) v b tr 36 chp thi mi chp c lu lng l 4000 3(m /h),- Do vy lu lng thi chung c kh l : CKtL= 36 4000 = 144000 3(m /h) + Khi lu lng thi chung t nhin bng :TNtL = CtL- CKtL= 437015,1 - 144000= 293015,13(m /h)+ Lc ny ta c tng lu lng khng kh trao i nh sau:TNtL = 293015,1 3(m /h)vChL= 306079,13(m /h)Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5149 N MN HC- Tng nhit tha trong phn xng l : - thQ = 569850 (kcal/h)Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5150 N MN HCSinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5151 N MN HC- S thng gi t nhin chu tc dng ca nhit tha v gi nh sau:K33K1L1K2L2Hpx18000K2L2,,VCKRCK11,0LLLHnh 2.13 : Mt ct ngang phn xng Din tch ca:F =cdF+ csF 2 ( ) m+ Trong :- cdF: Din tch ca i 2 ( ) m- csF: Dic tch ca s 2 ( ) m+ Vi- 1F= 1cdF+ 1csF= 36 + 108 = 144 2 ( ) m - 3F= 2cdF+ 2csF= 48 + 108 = 1562 ( ) m - 2F= 4F = cmF= 81 2 ( ) m- Vi cmF : L din tch ca mi.- Khong cch t tm ca s hay ca i n tm ca mi l: H = 12(m)* Khi lng ring ca khng kh ng vi cc nhit trong nh v ngoi nh.- Nt= 32,6 0( ) Ctng ng vi N2731, 29273 32, 6 + 1,152 3(kg/m )- vlvt= 34 0( ) Ctng ng vi vlv2731, 29273 34 = +1,147 3(kg/m )-Rt= 34+1,1 (7,2-2) = 39,80( ) Ctng ng vi :R273 1, 29273 39,8 +1,1253(kg/m )+ Nhit trung bnh bn trong nh : TB R vlvRt + t 34 39,8t36,92 2+ 0( ) C- Vy trng lng trung bnh ca khng kh i ra khi ca :Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5152 N MN HCTBR TBR1,293 1, 29336,9t11+273273 + 3(kg/m ) + Phng trnh cn bng lu lng trong phn xng :CK CKV R 1 3 2 2'L +L + L = L L L + + vi2L= 2'L+ Phng trnh cn bng nhit :

TN TN CK CK TN TN CK CKV V V V R R R R thL t c + L t c + Q =L t c + L t c + Xc nh lu lng khng kh trao i :

CK thV 1 3p R N134891 3600 0, 24 (36, 9- 32, 6)QL + L + L3600C (t - t ) 104,8 (kg/s)CKV1 3p R NL 370815, 2 L + L 104,8 - 104,8 -3600C (t - t ) 3600 0, 24 (42,8-32,6) 62,7 (kg/s)V CKR2 2p R N'248533,33600 0, 24 (42,8- 32, 6)LL L 104,8 - 104,8 -3600C (t - t ) + 76,6(kg/s)* Vi2L= 2'Lth ta c2L= 2'L76, 62 38,3 (kg/s)+ Gi thit1L= 3Lth ta c 1L=3L62,72 31,35 (kg/s)- p sut ng ca ca gi :22g dg Nv3,3P 1,1522g 29,81 0,642(kG/m )- Cc h s kh ng cc ca kt qu thc nghim

1K = + 0,6 ; 2K= - 0,45 ; 3K= - 0,3 ; 2'K = - 0,45+ p sut gi ti tm cc ca s : 1p,2p,3p,2'q- 1p = 1K dgP= 0,60 0,64=0,3842(kG/m )- 2p = 2K dgP = - 0,45 0,64= - 0,288 2(kG/m )- 3p = 3K dgP = - 0,30 0,64= - 0,192 2(kG/m )- 2'p= 2'K dgP = - 0,45 0,64= - 0,288 2(kG/m )- p sut gi quy c ti ca 2 : qu2p= 2p H( N- TBR) = - 0,45 -12(1,152 - 1,133) = - 0,678 2(kG/m ) qu2p= 2'p H( N- TBR) = - 0,45 -12(1,152 - 1,133) = - 0,678 2(kG/m )+ Ta nhn thy cc h s lu lng cho tt c cc ca bng nhau v bng 0,64. p dng cng thc 8 -27 trang 272 gio trnh K Thut Thng Gi ca GS.Trn Ngc Chn th p sut tha bn trong mt phng chun i qua tm cc ca gi vo bn di s l.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5153 N MN HC2 qu1 2x 2 2p +pp + 2(kG/m ) Trong : = 21L 38,3L 31,35 1,22 vgi thit 21F1,5F + Do :( )2 22 2 qu1 2x 2 2 2 20, 678 1,22 0,384 + 1,5 p + pp + 1,22 + 1,5 - 0,2552(kG/m )*Tnh hiu s p sut ti tm mi ca :1p= 1p - xp =0,384 - (- 0,255) = 0,6392(kG/m )3p= 3p - xp= (- 0,192) - (- 0,255) = 0,0632(kG/m )2p= 2p - qu2p= (- 0288) - (- 0,678) = 0,392(kG/m )2'p = 2'p- qu2p= (- 0288) - (- 0,678) = 0,392(kG/m )+ Xc nh din tch ca cc ca :11x N 1L 31,35F0,64 29,811,1520,639 2g(p - p ) 12,9 2(m )22quR 2 2L 38,3F0,64 29,811,1150,39 2g(p - p ) 20,5 2(m )33x N 3L 31,35F0,64 29,811,1520,063 2g(p - p ) 41,12(m )22quR 2 2'''L 38,3F0,64 29,811,1150,39 2g(p - p ) 20,5 2(m )+ Kim tra li t s :21F 20,5=1,6F 12,9 Chnh lch l nh nn c th chp nhn c v ta thy din tch ca tnh ton nh hn nhiu so vi din tch ca thc t do thng gi t nhin hon ton m bo kh ht nhit tha trong xng. Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5154 N MN HCCHNG V: S KHNG GIANH THNG THNG GITNH TON THY LC V CHN THIT BI.S khng gian ca h thng thng gi.1.H thng ht cc b.1.1.H thng ht bi 1.- H thng ht bi 1 c ht cc thit b sau : Boong ke ct v my trn s 1, 2, 3 v s 4, My ph khun v x l ct 1 v 21' 2' 3' 4' 5'1 2 3 4 561.2.H thng ht biv nhit 2 .- H thng ht 2 c ht cc thit b sau : Khu rt vt liu .1.5.H thng ht bi 5.- H thng ht bi 5 c ht cc thit b sau : My phun bi bn quay trong bung vbung phun bi.1 21'2.H thng thi cc b.2.1.H thng thi chung 1Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5155 N MN HCII.Tnh ton thy lc ca h thng thng gi.1.H thng ht cc b.+ Vi cc thng s tnh ton sau :- Vn tc chn trong khong 6 - 15 (m/s).- nhit 13,3 0C tng ng vi Ct273 1, 29273 13,3 + 1,233(kg/m )- nhit 32,6 0C tng ng vi Ct273 1, 29273 32, 6 + 1,152 3(kg/m )- 2vP 2g : Vi :g = 9,81 (m/2s ) v cbP = P,P= Rl + cbPCc h s sc cn cc b ca h thng thiTn thtTht dng t ngt01FFCt 900chc 3 chc 4Loa ni vo qutChp ht trn thit b,mi duaL iu chnh ming htChp ht trn thnh 0,35 0,3 0 0,1 0,2 0,6 0,3Bng 2.30: Bng tnh ton thu lc h thng ht 1SttL3m /hlmvmmDmmRkG/2mRlkG/2mPcbPkG/2mPkG/2m1 2 3 4 5 6 7 8 9 10 11Nhnh 1 on ng chnh1 1800 12,6 225 0,799 9,712 3600 12,9 315 0,549 12,93 7200 12,6 450 0,336 9,714 12600 14,3 560 0,325 12,51Tng 65,17Nhnh 1 on ng ph1' 1800 12,6 225 0,799 9,712' 1800 12,6 225 0,799 9,713' 1800 12,6 225 0,799 9,714' 1800 12,6 225 0,799 9,715' 1800 12,6 225 0,799 9,71Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5156 N MN HCBng 2.31: Bng tnh ton thu lc h thng ht 2SttL3m /hlmvmmDmmRkG/2mRlkG/2mPcbPkG/2mPkG/2m1 2 3 4 5 6 7 8 9 10 11Nhnh 1 on ng chnh1 905,6 3,8 12,6 160 1,22 4,64 1,60 9,71 15,54 12,682 1811,2 9,0 12,7 225 0,811 7,30 0,46 9,86 4,54 10,193 3622,4 9,0 13,0 315 0,557 5,01 0,46 10,34 4,76 10,194 5433,6 18,85 12,1 400 0,361 6,80 1,16 8,95 10,38 12,685 10867,2 12,0 12,0 560 0,244 2,93 0,81 9,25 7,49 0,006 16300,8 12,0 14,6 630 0,292 3,50 0,81 13,04 10,56 14,077 19017,6 18,0 13,4 710 0,213 3,83 1,61 10,98 17,68 21,51Tng 81,32Nhnh 1 on ng ph1' 905,6 2,7 12,6 160 1,22 3,29 1,60 9,71 15,54 18,832' 905,6 3,8 12,6 160 1,22 4,64 1,60 9,71 15,54 20,173' 905,6 3,8 12,6 160 1,22 4,64 1,60 9,71 15,54 20,174' 5433,6 18,85 12,1 400 0,361 6,80 1,60 8,95 14,32 21,125' 5433,6 18,85 12,1 400 0,361 6,80 1,60 8,95 14,32 21,126' 2716,8 18,85 13,0 315 0,557 10,50 1,60 10,34 16,54 27,042.H thng thi cc b.+ Vi cc thng s tnh ton sau :- Vn tc chn trong khong 6 - 15 (m/s).- nhit 13,3 0C tng ng vi Ct273 1, 29273 13,3 + 1,233(kg/m )- nhit 32,6 0C tng ng vi Ct273 1, 29273 32, 6 + 1,152 3(kg/m )- 2vP 2g : Vi :g = 9,81 (m/2s ) v cbP = P,P= Rl + cbPCc h s sc cn cc b ca h thng thiTn thtTht dng t ngt01FFCt 900chc 3 chc 4Loa ni vo qutMing thi L iu chnh Ca ly gi 0,35 0,3 0 0,1 1,8 0,05 0,75Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5157 N MN HCBng 2.35: Bng tnh ton thu lc h thng thng gi thi chungStt L3m/hlmvmmDmmRkG/2mRlkG/2mPcbPkG/2mPkG/2mNhnh 1 on ng chnh1 3000 6,7 400 0,12 2,752 6000 6,8 560 0,081 2,833 9000 6,4 710 0,054 2,514 12000 6,7 800 0,050 2,755 15000 6,6 900 0,042 2,666 18000 7,9 900 0,059 3,827 21000 7,5 1000 0,047 3,44TngNhnh 1 on ng ph1' 1500 6,8 280 0,192 2,832' 1500 6,8 280 0,192 2,833' 1500 6,8 280 0,192 2,834' 1500 6,8 280 0,192 2,835' 1500 6,8 280 0,192 2,833.Tnh ton chn thit b lc bi cho h thng thi.- Thit b lc bi chn cho cc h thng l li lc bi. Li lc bi l thit b lc c ch to di dng tm t mt loi vt liu hoc nhiu loi vt liu khc nhau to ra l hng v li i dch dc bn trong b dy ca n.- Cu to ca khung l loi tm lc g c khung lm bng kim loi xung quanh, hai mt c cng li thp v gia hai lp thp l vt liu m : khu kim loi, khu s, khu nha, si thu tinh, si nha, dy kim loi ri- Nng sut lc ca li lc bi dng tm l :G = 4000 5000 (3m/h. 2m) Chn G = 5000 (3m/h. 2m)- Lu lng khng kh cn lc ca h thng lcl : L(3m/h)- Din tch tm lc tng cng : F = LG (2m)- Kch thc ca tm li lc l 50050080(mm), khu kim loi c kch thc l:13131(mm).- Vy s tm li cn thit cho mi h thng 1 l : N = Ff (tm) - Sc cn thu lc ca tm li lc l: H= P = 8-10 kG/2mChn P =10 kG/2m.3.1.H thng thi3.1.1.H thng thi chung.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5158 N MN HC+ Ta c : L = 60000(3m/h) F = L 60000G 5000= 12 (2m)- Vy s tm li cn thit cho mi h thng 1 l :N = F 12f 0,25= 48 (tm) 3.2.Tnh ton thit bv li lc bi cho h thng ht.3.2.1.H thng ht 1.+ Ta c : L = 16512,5 (3m/h) F = L 16512,5G 5000= 3,3 (2m)- Vy s tm li cn thit cho mi h thng 1 l :N = F 3,3f 0,25= 13,2 (tm) Chn N = 14 (tm )3.2.1.H thng ht 4 v ht 5+ Tnh ton xyclon.Bng 2. phn tn ca bi theo ng knh ht.ng knh ht, m< 5 5 10 10 20 20 40 40 60 > 60 phn tn% 6,0 8,0 22,0 26,0 23,0 15,0- Khi lng n v ca bi: b = 1,93 (g/c3m)+ Lu lng kh cn x l :- H thng ht 4 L = 3786 (3m/h)v h thng ht 5 L = 3600 (3m/h). - Theo tra bng 9-3 trang 324 gio trinh K thut ca GS.Trn Ngc Chn, ta tra c ng knh ca xyclon Liot 4: D = 115 (mm), d = 345 (mm), v = 12 - 18 (m/s) v sc cn thu lc qua xyclon: 22 - 50 kG/2m.- ng knh ng trong : 1,9d = 1,9345 = 655 (mm) - ng knh ng x : 3,24d = 3,24345 = 1118(m) - Chiu cao phn hnh tr xyclon : H = 5d = 5345 = 1725 (m)- ng knh ng x bi: 0,4d = 0,4 345 = 138(m)- Chiu cao t y xyclon n van kha: 1d = 1345 = 345 (m)- Chiu cao phn hnh chp : 4d = 4345 = 1380 (m)- Chiu cao t nh xyclon n u mi phun: 2,4 d = 2,4345 = 828 (m)- Chiu cao phn chp ct : 0,3d = 0,3345 = 104 (m)- Chiu cao phn ch nht : 1,17d = 1,17345 = 404 (m)- Khong cch gia hnh nn ct v phn ch nht : 0,2d = 0,20,345 = 69 (m)- Chiu cao t ng x cn n nh thit b: 11,67d = 11,670,345 = 4026 (m)Chi tit xyclon Liot 4Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5159 N MN HC34534534564340465540261046917251380345138559 55934553982711669161118- Tra biu hnh 2.1 Hiu sut lc bi theo phn tn ht bi trong xyclon chun ta c hiu sut lc theo ng knh ca ht bi ghi di bng sau:ng knh ht, m< 5 5 10 10 20 20 40 40 60 > 60Hiu sut lc,% 60 86 93 95 96 97- Hiu sut lc bi ca xyclon l. i i0 6, 0 60 8, 0 86 22 93 26 95 23 96 15 97 92, 27100 100 + + + + + (%)4.Chn qut v ng c in + Khi chn qut ta phi k n h s d tr ca qut c v lu lng v tn tht vi h s d tr k = 1,2- Ta c bng thng k lu lng tnh ton v tn tht p sut ton phn ca cc h thng l4.1.H thng thi.- Sc cn thu lc ca tm li lc l: H= P = 8-10 kG/2mChn P =10 kG/2m+ Tnh ton cng sut v chn ng c in : Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5160 N MN HC- Cng sut in tiu th trn trc qut khi k n tn tht trong trc, bi :tttr,dKLpN102 (kW)+Trong : - K : h s d tr , vi qut ly tm c cnh un cong ra trc K = 1,1 1,15. - L : lu lng ht ca qut. - p: p sut do qut gy ra. - : hiu sut ca qut.-tr,d: H s truyn ng gia ng c v qut .Vi qut v ng c lp trc tip cng trc nhng qua khp ni th : tr,d= 1Bng 2.42: H thng lu lng thi v p sut ton phnTn h thng L(3m/h)tpPkG/2mkttL3m/httPkG/2mHkG/2mtttpPkG/2mThi chung 1 60000 83,05 1,2 72000 99,66 10 109,66Thi chung 2 60000 83,05 1,2 72000 99,66 10 109,66Thi chung 3 12000 85,15 1,2 14400 102,18 10 112,18Thi chung 4 54000 104,32 1,2 64800 125,18 10 135,18Thi chung 5 54000 104,32 1,2 64800 125,18 10 135,18Thi hoa sen 1 27888 83,65 1,2 33466 100,38 10 110,38Thi hoa sen 2 23904 56,76 1,2 28685 68,112 10 78,114.1.1.H thng thi chung 1 v thi chung 2+ Ta c : L = 72000(3m/h)vtttpP= 109,66 (kG/2m)- Theo ph lc 5 sch Thng Gi ca G.S Trn Ngc Chn trang 409 . Ta chn qut ly tm LI 4 -70 N012 c cc ch s l :-Hiu sut =0,66- p sut ton phn : H = 110 (kG/2m)- ng knh ming thi : 840 (mm)- ng knh ming ht: 1124 (mm)- Lu lng thi l : 72000 (3m/h) = 20 (3m/s)- S vng quay ca qut : 850 (vng/pht)-Vn tc quay ca cnh qut : 54 (m/s)+ Vy sng sut tiu th trn qut l : tttr,dKLp 1,1520110N102 1020,661 = 37,6(kW)- Ta tin hnh chn ng c c cng sut gn nht v v pha ln hn so vi cng sut tnh ton.4.1.3.H thng thi chung 4 v thi chung 5.+ Ta c : L = 64800(3m/h)vtttpP= 135,18 (kG/2m)- Theo ph lc 5 sch Thng Gi ca G.S Trn Ngc Chn trang 409 . Ta chn qut ly tm LI 4 -70 N012 c cc ch s l :Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5161 N MN HC-Hiu sut =0,725- p sut ton phn : H = 136 (kG/2m)- ng knh ming thi : 840 (mm)- ng knh ming ht: 1124 (mm)- Lu lng thi l : 64800 (3m/h) = 18(3m/s)- S vng quay ca qut : 895 (vng/pht)-Vn tc quay ca cnh qut : 55 (m/s)+ Vy sng sut tiu th trn qut l : tttr,dKLp 1,1518136N102 1020,7251 = 38,1(kW)- Ta tin hnh chn ng c c cng sut gn nht v v pha ln hn so vi cng sut tnh ton.4.1.4.H thng thi hoa sen khng kh 1.+ Ta c : L = 33466(3m/h)vtttpP= 110,38 (kG/2m)- Theo ph lc 5 sch Thng Gi ca G.S Trn Ngc Chn trang 409 . Ta chn qut ly tm LI 4 -70 N08 c cc ch s l :-Hiu sut =0,76- p sut ton phn : H = 115 (kG/2m)- ng knh ming thi : 700 (mm)- ng knh ming ht: 904 (mm)- Lu lng thi l : 33466 (3m/h) = 9,3(3m/s)- S vng quay ca qut : 900 (vng/pht)-Vn tc quay ca cnh qut : 47 (m/s)+ Vy sng sut tiu th trn qut l : tttr,dKLp 1,159,3115N102 1020,761 = 15,9(kW)- Ta tin hnh chn ng c c cng sut gn nht v v pha ln hn so vi cng sut tnh ton.4.2.H thng ht.Bng 2.43 : H thng lu lng ht v p sut ton phnTn h thng L(3m/h)tpPkG/2mkttL3m/httPkG/2mHkG/2mtttpPkG/2mHt 1 16512,5 65,17 1,2 19815 78,20 10 88,20Ht 2 19017,6 81,32 1,2 22821 97,58 10 107,58Ht 3 1670,98 45,36 1,2 2005,2 54,43 10 64,43Ht 4 3786 55,92 1,2 4543,2 67,10 30 97,10Ht 5 3600 42,58 1,2 4320 51,09 30 81,09- Sc cn thu lc qua xyclon ca h thng ht 4 v ht 5 : 22 - 50 kG/2m- Chn30 kG/2m4.2.1.H thng ht 1Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5162 N MN HC+ Ta c : L = 19815(3m/h)vtttpP= 88,20 (kG/2m)- Theo ph lc 5 sch Thng Gi ca G.S Trn Ngc Chn trang 409 . Ta chn qut ly tm LI 4 -70 N08 c cc ch s l :-Hiu sut =0,76- p sut ton phn : H = 90 (kG/2m)- ng knh ming thi : 560 (mm)- ng knh ming ht: 720 (mm)- Lu lng htl : 19815 (3m/h) = 5,5 (3m/s)- S vng quay ca qut : 1050 (vng/pht)-Vn tc quay ca cnh qut : 44 (m/s)+ Vy sng sut tiu th trn qut l : tttr,dKLp 1,155,590N102 1020,761 = 7,4(kW)- Ta tin hnh chn ng c c cng sut gn nht v v pha ln hn so vi cng sut tnh ton.4.1.2.H thng ht 2.+ Ta c : L = 22821(3m/h)vtttpP= 107,58 (kG/2m)- Theo ph lc 5 sch Thng Gi ca G.S Trn Ngc Chn trang 409 . Ta chn qut ly tm LI 4 -70 N08 c cc ch s l :-Hiu sut =0,75- p sut ton phn : H = 110 (kG/2m)- ng knh ming thi : 560 (mm)- ng knh ming ht: 720 (mm)- Lu lng ht l : 22821 (3m/h) = 6,4 (3m/s)- S vng quay ca qut : 1120 (vng/pht)-Vn tc quay ca cnh qut : 47 (m/s)+ Tnh ton cng sut v chn ng c in : + Vy sng sut tiu th trn qut l : tttr,dKLp 1,156,4110N102 1020,751 = 10,6(kW)- Ta tin hnh chn ng c c cng sut gn nht v v pha ln hn so vi cng sut tnh ton.4.1.3.H thng ht 3.+ Ta c : L = 2005,2(3m/h)vtttpP= 64,432 (kG/2m)- Theo ph lc 5 sch Thng Gi ca G.S Trn Ngc Chn trang 409 . Ta chn qut ly tm LI 4 -70 N04 c cc ch s l :-Hiu sut =0,72- p sut ton phn : H = 65 (kG/2m)- ng knh ming thi : 285 (mm)- ng knh ming ht: 400 (mm)- Lu lng ht l : 2005,2 (3m/h) = 0,56(3m/s)- S vng quay ca qut : 1500 (vng/pht)Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5163 N MN HC-Vn tc quay ca cnh qut : 31 (m/s)+ Vy sng sut tiu th trn qut l : tttr,dKLp 1,150,5665N102 1020,721 = 0,57(kW)- Ta tin hnh chn ng c c cng sut gn nht v v pha ln hn so vi cng sut tnh ton.Sinh vin thc hin: Trn ng Thi Thnh - Lp : 51DT MS: 7365.5164