BO CO NKIM TON NNG LNG NH MY GIY HA KHNH

TM TTVi s h tr ca Ban Gim c Nh my giy Ha Khnh, chng ti tin hnh tm kim v nghin cu cc gii php tit kim nng lng. Cng tc ny nhm phn tch, nhn dng v a ra phng n thc hin cc gii php tit kim nng lng kh thi cho Nh my, nhm nng cao hiu qu s dng nng lng, TKNL, gim chi ph sn xut, gim nhim mi trng. Thi gian thc hin kim ton nng lng ti Nh my t ngy 16/4/2010 22/4/2010 vi s phi hp ca cc cn b k thut ca Nh my. Tt c cc s liu s dng trong bo co kim ton u c thu thp v o lng ti ch bng cc thit b o m, bn cu hi v thng qua tho lun vi cn b vn hnh trong thi gian kho st. Bo co kim ton nng lng tng th ny gip xy dng mt ci nhn tng th v hin trng tiu th nng lng trong cc b phn v cng on sn xut khc nhau trong Nh my. Qua t kim toan nng lng ny, cac c hi tit kim nng lng a c phat hin, nghin cu phn tich. Cc kt qu phn tch nh gi u da trn tnh trng vn hnh v ch hot ng hin nay ca Nh my. Cc gii php a ra u c vn u t thp v thi gian thu hi vn ngn. thc hin trn b cc gii php TKNL ny, vn u t ca Nh my l 617,7 triu ng, trong khi li ch em li hng nm ln n 445,399 triu ng. Nh vy thi gian thu hi vn khong 17 thng. V in nng, mi nm cng ty tit kim c khong 5,92%. Xt v chi ph nng lng, mi nm cng ty tit kim mt khon ln n 10,82%. Vy hiu qu v kinh t l rt ln. Cc gii php v tit kim nng lng nhn dng c trnh by trong bng di y.

1

BNG TM TT CC C HI TIT KIM NNG LNG

STT

Gii php

u t Nng lng tit (triu ng) kim

Chi ph tit kim (triu ng/nm)

Thi gian hon vn n

1 2 3 4

Thay n hunh quang thng thng T10 bng bng tit kim in T5 Lp thit b Powerboss cho ng c my nghin Tn dng nhit khi thi hm nng nc cp cho l hi Thay l hi Tng s

9,7 103 55 450 617,7

7.200 (kWh/nm) 67.160 (kWh/nm) 25,9 Tn than 104 Tn than

8,179 72,9 72 292,32 445,399

13 thng 17 thng 9 thng 19 thng 17 thng

2

I.

THNG TIN CHUNG V DOANH NGHIP

Tn doanh nghip: Nh my giy Ha Khnh a ch lin lc: khu cng nghip Ho Khnh

S cn b cng nhn vin: 150 ngi Nguyn liu chnh: Giy vn cc loi Sn phm chnh: Giy bao b carton

Cng sut thit k: 20.000 tn Sn lng nm c s: 13.482 tn/ nm 986 tn/nm 0 1.256.864 kWh/nm 0

Tiu th nng lng cc loi: Than (tn): Du: in: Gas:

S ca lm vic trong ngy: 3 ca Thi gian vn hnh trong nm (ngy/nm): 300 ngy/nm

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II. TNH HNH V SN XUTII.1. Tnh hnh sn xut thc t Sn lng giy thnh phm ca Nh my cc thng trong nm 2009 c cho bng 1 sau y: Bng 2.1 - Sn lng giy cc thng trong nm 2009 Nm 2009 Thng 1 Thng 2 Thng 3 Thng 4 Thng 5 Thng 6 Thng 7 Thng 8 Thng 9 Thng 10 Thng 11 Thng 12 Giy thnh phm, (tn) 780 900 870 990 900 990 960 1230 1302 1200 1620 1740

4

Biu sn lng giy thnh phm trong nm 20092000 1800 1600 Sn lng giy, tn 1400 1200 1000 800 600 400 200 0 1Thng

2

3

4

5

6

7

8

9

10

11

12

Hnh 2.1 - Biu sn lng giy thnh phm cc thng trong nm 2009 Qua biu , chng ta nhn thy tnh hnh sn xut ca Doanh nghip c nhng bin ng nht nh. Vo nhng thng cui nm (thng 11 v 12) sn lng giy tng ln ti cc i, iu ny l do vo nhng thng cui nm, doanh nghip y mnh sn xut, th trng cn cung nhiu. Ngoi ra, sn lng giy thnh phm trong thng 01 03 t mc ti thiu, iu l do nh my ang trong giai on sa cha bo dng thit b v ngh tt cui nm. II.2. Quy trnh sn xut 2.2.1 S quy trnh sn xut Hot ng sn xut giy cc sn phm giy ca Nh my c thc hin theo quy trnh sau y:

5

Nguyn liu Chn lc Nghin Gung bt

My xeo

Thnh phm Phn loi Nhp kho Hnh 2.2 Quy trnh cng ngh ca nh my

2.2.2 nh gi v tnh trng mi trng Nh my Giy Tn Long sn xut Giy gy nhim mi trng, tuy nhin mc va phi. Cc ngun gy nhim chnh bao gm: - Kh thi: Nh my s dng 03 l hi ng la t than cc, nhit khi sau khi ra ng khi rt cao lm nh hng mi trng v tht thot nhit. - Nc thi: Nc sn xut sau khi qua s dng mt phn s dng li, phn cn li tht thot qua ng nc thi, lan trn ln mt t gy nh hng mi trng. - Cht thi rn: Cht thi rn t Nh my ch yu l x than, cc ph phm t qu trnh la chn v phn loi giy ph liu. X than khng c x l ba bn trn mt t gy mt m quan v gy nhim mi trng.

6

7

III. HIN TRNG S DNG NNG LNGIII.1. H thng cung cp nng lng 3.1.1. H thng cung cp nng lng in Hin nay, Nh my mua in ca EVN cp 6kV thng qua 1 trm bin p l 560 kVA vi n gi tin in c tnh theo n gi mi mc ba gi nh sau: Gi bnh thng : 955 VND/kWh a ) Gm cc ngy t th Hai n th By + T 04h00 n 9h30 (5h30 pht). + T 11h30 n 17h00 (5h30 pht). + T 20h00 n 22h00 (02h). b ) Ngy Ch nht : + T 04h00 n 22h00 (18h) Gi cao im : 1.900 VND/kWh a ) Gm cc ngy t th Hai n th By + T 09h30 n 11h30 (02h). + T 17h00 n 20h00 (03h). b ) Ngy Ch nht : khng c gi cao im. Gi thp im : 540 VND/kWh Tt c cc ngy trong tun: t 22h00 n 04h ngy hm sau 3.1.2. H thng cung cp nng lng than Hin nay, nhu cu nng lng than c Nh my mua trc tip t Cng ty than Nng Sn. Than c vn chuyn bng ng b cung cp n Nh my. Loi than tiu th ti Nh my l than cc 3. n gi than trung bnh l 2.800 VN/kg v lng than tiu th trung bnh hng thng l 80 tn. III.2. Nhu cu nng lng 3.2.1. Nhu cu in nng Nhm kim ton tin hnh o ti Nh my t 10 gi ngy hm trc n 9 gi ngy hm sau. in nng s dng cho cc thit b c phn tch mt cch chi tit v cn k. Vic phn tch ny da trn s kho st o c thc t v nhng thng tin thu thp t cn b qun l v cng nhn lm vic ti Nh my.

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Bng 3.1 - S liu ph ti trong 1 ngy kho st Gi trong ngy (h) 10 11 12 13 14 15 16 17 18 19 20 21 in nng tiu th (kWh) 325 319 297 361 406 288 221 244 220 239 200 159 Gi trong ngy (h) 22 23 24 1 2 3 4 5 6 7 8 9 in nng tiu th (kWh) 163 145 140 130 123 113 135 127 184 203 258 281

Biu in nng tiu th ngy 18-19/4/2010450 400

in nng tiu th, kWh

350 300 250 200 150 100 50 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 1 2 3 4 5 6 7 8 9

Gi trong ngy

Hnh 3.1 - th ph ti ca Nh my mt ngy sn xut in hnh

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Biu ph ti in ch r tnh trng tiu th in ton doanh nghip mt cch tng qut. C th thy rng nhu cu in ca doanh nghip bin i theo tng thi im, ph thuc vo tnh hnh sn xut. 3.2.2. Nhu cu nng lng than Ti Nh my hin c 3 l hi kiu ng t than, hu ht cc l c cng sut nh, tiu hao nhin liu ln, nhit khi thi rt cao. Di y l lng than tiu th trung bnh ca cc l hi ti Nh my. Bng 3.2 - lng than tiu th trung bnh ca cc l hi ti Nh my. TT 1 2 3 Tn gi l hi L hi s 1 L hi s 2 L hi s 3 Cng sut (kg/h) 1.000 1.000 1.200 Lng than tiu th (kg than) 148 162 170

III.3. Tiu th nng lng v sn phm Nh my chuyn sn xut, gia cng v kinh doanh giy cun, thng cartong cc loi. Ngun nng lng s dng ch yu l in, than. Qua qu trnh kho st, chng ti nhn thy lng nc cn thit cung cp cho qu trnh sn xut l khng ln, hu ht Nh my t x l nc thi v a vo ti s dng. V vy, trong phn nh gi chng ti ch i su vo phn tch hin trng s dng in v than ti Nh my. 3.3.1. Tiu th in nng v sn phm in nng tiu th trung bnh hng thng ti Nh my l 104.000kWh. Chi ph tin in trung bnh 113,7 triu ng/thng Sn lng giy thnh phm v lng in tiu th ca cc thng trong nm 2009 c th hin cc bng di y:

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Nm 2009 Thng 1 Thng 2 Thng 3 Thng 4 Thng 5 Thng 6 Thng 7 Thng 8 Thng 9 Thng 10 Thng 11 Thng 12

Bng 3.3 - Sn lng giy v chi ph in trong nm 2009 in Giy thnh phm (tn) kWh Thnh tin, VND 73.008 79.286.688 780 84.896 92.197.056 900 80.832 87.783.552 870 93.408 101.441.088 990 84.332 91.584.552 900 90.928 98.747.808 990 87.664 95.203.104 960 114.832 124.707.552 1230 120.800 131.188.800 1302 111.936 121.562.496 1200 151.248 164.255.328 1620 162.976 176.991.936 1740Biu so snh in nng v sn lng giy trong nm 2009

180000 160000 140000 120000 100000

2000 1800 1600 Sn lng giy, tn 1400 1200 1000

in nng, kWh

80000 800 60000 40000 20000 0 1 Thng in nng tiu th,kWh Sn lng giy, tn 2 3 4 5 6 7 8 9 10 11 12 600 400 200 0

Hnh 3.2 - Biu sn lng giy v chi ph in trong nm 2009 Qua biu , chng ta nhn thy c hai ng c tnh c nhng sai lch nht nh, iu l do khi thng k s liu lng sn phm v lng in nng ti Nh my khng thng nht. 3.3.2. Tiu th than v sn phm11

Lng than tiu th hng thng bnh qun ti Nh my l 80 tn. Chi ph do tiu th than khong 229 triu ng/thng. Sn lng giy thnh phm v lng than tiu th ca cc thng trong nm 2009 c th hin cc bng di y: Bng 3.4 - Sn lng giy v chi ph than trong nm 2009 Nm 2009 Than Giy thnh phm (tn) Tn Thnh tin(ng) Thng 1 Thng 2 Thng 3 Thng 4 Thng 5 Thng 6 Thng 7 Thng 8 Thng 9 Thng 10 Thng 11 Thng 12 48 62 60 66 63 68 72 94 112 98 125 116 134.400.000 173.600.000 168.000.000 184.800.000 176.400.000 190.400.000 201.600.000 263.200.000 313.600.000 274.400.000 350.000.000 324.800.000 780 900 870 990 900 990 960 1230 1302 1200 1620 1740

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Biu so snh than tiu th v sn lng giy trong nm 2009700 140

600

120

500

100

400

80

300

60

Than tiu th, tn

200

40

100

20

0 1 Thng 2 3 4 5 6 7 Sn lng giy, tn 8 9 10 Than tiu th, tn 11 12

0

Hnh 3.3 - Biu sn lng giy v chi ph than trong nm 2009 Qua biu , chng ta nhn thy lng than tiu th v sn lng giy thnh phm ti doanh nghip tng i n nh, iu l do doanh nghip c cc phng php thng k, qun l mt cch hp l vn hnh tt.

III.4.

Cn bng nng lng in

Ti xng sn xut ca Nh my, h thng in c s dng cp in cho cc ng c my nghin, my xeo v cc thit b tiu th in khc, c th theo bng sau:

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Sn lng giy, tn

Bng 3.5 - Danh mc cc thit b sn xut tiu th in Tn thit b ng c my nghin H Lan ng c my nghin thu lc ng c my nghin thu lc ng c my nghin a ng c my nghin a ng c my nghin a ng c my nghin a ng c my gung bt My xeo ng c bm nc l hi ng c bm nc ng c qut gi l hi S lng 04 05 01 01 03 01 01 06 04 02 04 03 Cng sut P1 (kw) 45 30 75 22 37 45 75 7,5 15 2,2 2,5 1,5 Thi gian vn hnh (gi/ngy) 08 18 12 06 06 06 06 20 16 16 16 16

Hnh 3.4 Cn bng nng lng Bng sau y so snh gia phn trm cng sut vn hnh v phn trm in nng tiu th ca tng h s dng in. Bng 3.6 - in nng v cng sut in tiu th trong thi gian kho st Mc ch s dng H thng my nghin H thng my xeo H thng my gung bt H thng l hi Cng sut vn hnh 67% 6% 5% 6%14

in nng tiu th (%) 64% 14% 2% 6%

H thng bm nc Cc thit b thnh phm Ph ti vn phng

7% 8% 1%

6% 6% 2%

Cc h tiu th c cng sut vn hnh b nhng tiu th in nhiu l do chng c thi gian vn hnh di (h thng my xeo). Ngc li cc h tiu th c cng sut vn hnh ln thng c thi gian vn hnh ngn hn (vn hnh gin on khng lin tc) (my nghin).

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IV. CC C HI TIT KIM NNG LNG ECOIV.1. C hi 1 (ECO1): Thay bng n hunh quang thng thng T10

bng bng n hunh quang tit kim in T5a. Hin trng H thng chiu sng tiu th khong 1% tng in nng tiu th ca ton Nh my. Cc b n chiu sng hin nay l loi 40W v chn lu st t. Tng s bng n hin nay l 100 bng. Bng di y thng k chi tit s lng n trong cc khu vc. Bng 4.1 - Thng k n chiu sng trong cc khu vc Stt 01 02 Khu vc Xng sn xut Vn phng Loi n Hunh quang 40W Hunh quang 40W Trung bnh S lng (bng) 88 12 S dng (gi/ngy) 16 8 15

b. Phng n ci thin Cc b n hunh quang truyn thng T10-40W s dng chn lu st t nh hin nay, nn thay chng bng th nhng b n hunh quang T5 28W v chn lu in t c hiu qu chiu sng cao, t tn hao: Nhng u im ca b n hunh quang s dng chn lu in t: - Khng cn chut, khi ng tc th ngay khi bt n. - H s cng sut gn nh bng 1, do dng in chy trn dy dn in b hn, lm dy in mt hn. - Khng c ting n, gim bt s pht tn nhit. - Tiu tn t in nng hn cc b n truyn thng. - Hot ng ngay c trong trng hp in p thp, lm gia tng tui th bng n. c. Li ch chi ph Bng 4.1.2 sau y so snh hiu qu ca n T10-40W s dng chn lu thng v n T5-28W s dng chn lu in t tit kim nng lng.

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Bng 4.2 nh gi li ch v chi ph ca phng n chiu sng STT 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Ch tiu/Thng s S lng bng n S lng chn lu Gi bng n Gi chn lu Gi mt b n Tng tin u t Tng chi phi gia tng Cng sut tiu th mt bng n Cng sut tiu th mt chn lu Cng sut tiu th mt b n S gi s dng trong ngy S ngy s dng trong nm in nng tiu th trong1 nm in nng tit kim Gi in bnh qun S tin tit kim trong 1 nm Thi gian hon vn Chit khu Thi gian kho st Gi tr hin ti thun (NPV) n v Ci Ci VND VND VND VND VND Wh Wh Wh Gi Ngy kW kW VND VND Thng %/nm Nm VND 40 12 52 12 300 18.720 7.200 1.136 8.179.200 13 12% 5 21.584.186 B n (T10) 100 100 10.000 36.000 96.000 9.600.000 B n (T5) 100 100 29.000 65.000 175.000 17.500.000 28 4 32 12 300 11.520

7.900.000

Nh vy, gii php thay th cc bng n hunh quang 40W chn lu st t bng b n hunh quang tit kim nng lng T5-28W vi chn lu in t s gip tit kim mi nm 7.200kWh in, tng ng vi 8,179triu VN. Theo nh tnh ton th thi gian hon vn gin n l 13 thng, nh vy thi gian hon vn nhanh, vn u t thp v lng in nng tit kim c hng nm l ng k.

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IV.2. C hi 2 (ECO2): Lp t thit b Powerboss cho ng c my nghin thu Lc 30kWa. Hin trng Qua kho st, chng ti nhn thy cc ng c my nghin lun hot ng ch non ti, cng sut trung bnh ng c t c l 50% so vi cng sut nh mc, ng c hot ng vi ti thay i v khng s dng ht cng sut ng c. V vy ng c s tiu th mt lng in nng ln, iu ny gy tn hao v in nng, lm cos ng c thp, mt phn in nng s chuyn thnh nhit lm nng cun dy v lm rung roto, dn n ng c pht ra ting n, gi ho cht cch in, mi mn c kh nh hng n tui th ng c. Hin ti Nh my ang s dng nhiu my nghin thu lc trong c 02 my nghin giy ang hot ng 12h/ngy cng sut nh mc mi my l 30kW v 01 my nghin hot ng 24h/ngy c cng sut nh mc l 75kW. Bng 4.3 - Cc thng s o c ng c my nghin Thu Lc Tn thit b ng c my nghin Thu Lc 30 ng c my nghin Thu Lc 75 S lng 02 01 CS nh mc CS thc t in p (V) P1 (kw) P2 (kw) 30 75 14,9 37,8 408 403 Cos 0,72 0,67

Ngoi ra, hin nay ng c s dng phng php khi ng truyn thng (khi ng trc tip, khi ng sao-tam gic), nn khi khi ng xy ra qu trnh qu xut hin dng in chy trong cun dy l rt ln khin cho ng c b git mnh, cc cun dy chu xung dng in tc thi ln gy nguy him cho ng c, nh hng n h thng in chung ton doanh nghip. b. Phng n ci thin H thng iu khin ng c Powerboss l mt thit b dng phn mm iu khin c tnh nng lin tc gim st tnh trng ti ca ng c v cp va in nng cn thit cho ng c thc hin tc v. C th thy iu ny qua vic gim kW/gi ng h o. Bi v trong mt giy, chng trnh iu khin kim tra thay i ca ti ng c 100 ln tn s thc hin 50Hz nn ng c khng bao gi b tn hi. Vy gii php ca chng ti a ra l lp t thit b tit kim in nng POWERBOSS cho ng c my nghin Thu lc.

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trc khi lp t Powerboss sau khi lp t Powerboss Hnh 4.1 S liu kho st ng c my nghin 30kW Lng tit kim tnh ton c : ( 14,9 - 12,3 )/14.9*100% 17,5 %

Hnh 4.2 Thng s o c ca ng c my nghin 75kW Vi ng c my nghin 75kW, ta thy h s cos thp hn so vi ng c my nghin 30kW, do khi lp t Powerboss t l tit kim s cao hn do t l cos tng nhiu so vi khi lp t ti ng c my nghin 30kW. Do , chng ti tm tnh t l tit kim chung cho gii php ny 17,5% c. Li ch chi ph Chi ph u t: C = 103.000.000 VN Powerboss cho ng c my nghin thu lc 30kW 23.700.000 VN/ci * 2 ci = 47.400.000 VN19

Powerboss cho ng c my nghin thu lc 75kW: 55.600.000 VN/ci - Lng tin tit kim: B = 72.000.000 VN o Lng in nng tit kim trong 1 gi: Qua kho st v thu thp thng tin t cn b qun l, chng ti nhn thy mi ngy cc ng c my nghin 30kW hot ng khong 12gi v ng c my nghin 75kW hot ng 24h, 1 nm hot ng 300 ngy Tng lng in tit kim trong 1 nm l: D = (14,9*17,7%*2*12 + 37,8*17,7%*24)*300 = 66.402 kW/h Vy lng tin tit kim trong 1 nm l: B = 66.402* 1086 = 72.000.000 VN/nm (Gi in trung bnh ca Nh my l 1086 ng/kWh) - Thi gian hon vn: T = C/B = 103.000.000 / 72.000.000 17 thng i vi c hi ny li ch khng ch tit kim in m cn l c hi bo v ng c, tng tui th ca thit b. Do vy, chng ti kin ngh nn trin khai gii php ny. IV.3. C hi 3 (ECO3): Tn dng nhit khi thi l hi hm nng nc

cp cho l hia. Hin trng Qua kho st, hin nay cc l hi ti doanh nghip c nhit khi thi rt cao. iu ny gy tn tht nhit v nh hng mi trng. Bng 4.4 - Cc thng s o c ti l hi TT Tn gi l hi Cng sut (kg/h) 1.000 1.000 1.200 Nhit khi thi, oC 268 295 326 Lng than tiu th, kg 148 162 170 Lu lng khi thi (m3/h) 1964 1826 1725

1 2 3

L hi s 1 L hi s 2 L hi s 3

b. Phng n ci thin S dng b trao i nhit ng ng bao quanh ng khi tn dng nhit khi thi hm nng nc cp vo l hi. c. Li ch chi ph20

o Chi ph u t: C = 55.000.000 VN - Vt liu: 53.000.000 ng, trong : o B trao i nhit ng ng: 45.000.000 ng o Bo n: 2.000.000 ng

o Bm nc nng tun hon: 5.000.000 ng - Nhn cng + vt t ph: 3.000.000 ng - Tng chi ph: 55 triu ng o Lng tin tit kim: B = 72.576.000 VN - Tng lu lng khi thi ca 3 l hi l: 5.515 m3/h. - Lng nhit gia nc thnh hi bo ho Q= D*(I2-I1) Trong I2: Entropi ca hi nc p sut bo ho p sut 7bar, tra bng ta c I2= 2771,12 kj/kg I1:Entropi ca nc nhit 300C, tra bng ta c I1= 126,65 kj/kg T tnh c Q= D*(I2-I1)= (2771,12-126)*3200/3600=2267 (Kw) Nhit tr thp nhin liu ca than Qlvt = 28.000 kj/kg Gi s hiu sut ca l hi l 100% khi sut tiu hao nhin liu l B1=Q/Qlvt =2267/2800=0.081 (kg/s) - Khi c thit b trao i nhit nhit nc t 70oC I1:Entropi ca nc nhit 700C, tra bng ta c I1= 293 kj/kg T tnh c Q= D*(I2-I1)= (2771,12-293)*3200/3600=2118 (Kw) Gi s hiu sut ca l hi l 100% khi sut tiu hao nhin liu l B2=Q/Qlvt =2118 /28000 = 0.076 (kg/s) Nh vy khi s dng b hm nc th chnh lch xut tiu hao nhin liu gia hai phng n lB = B2 B1 = 0.005 (kg/s) Vi thi gian hot ng ngy 4 ting th 1 nm s tit kim c 25.920 Kg than. Vi n gi than l 2.800 /kg th mt nm s tit kim c s tin l

= 25.920*2800= 72.576.000 Nh vy sau 10 thng s hon vn C hi ny c vn u t thp v thi gian hon vn n nh hn 2 nm nn khng cn phi nh gi cc ch tiu kinh t khc.

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IV.4. C hi 4 (ECO4): Thay l hi mi a. Hin trng Qua kho st, hin nay cc l hi ti doanh nghip c ch chy khng n nh, nhit khi thi rt cao. iu ny gy tht thot nng lng, tn tht nhit v nh hng mi trng. b. Phng n ci thin u t mi l hi t than kiu nm cng sut 2 tn hi/gi. L hi mi theo thit k: L hi mi cng sut 2 tn/h loi 3pass thay cho 2 l hi 1tn/h. o Do l hi mi c lp thm ng nc pha trc, ng khi i li 3 vng tun hon nn tiu th than t hn. S liu than tiu th: 250kg/h Lu lng kh thi ca l: 2.400 m3/h Nhit kh thi l: 110 0C

-

c. Li ch chi ph Chi ph u t: C = 450.000.000 VN Lng tin tit kim: B = 292.320.000 VN Lng than tiu th ca 2 l 1tnhi/h l: 310 kg/h. Khi l hi mi c u t thay th cho 2 l 1tnhi/h bng 1 l 2tnhi/h, Lng than tiu th ca l mi 2tnhi/h l: 250kg/h. Lng than tit kim trong mt gi (theo thit k) : 310 250 = 60 kg Thi gian hot ng: 6h/ngy Lng than tit kim trong 1 ngy: (310 250) * 6 = 360 kg S ngy hat ng/ nm ca l l: 290 ngy Vy lng than tit kim trong 1 nm l: 360 * 290 = 104.400 kg Lng tin tit kim trong mt nm: B = 104.000 * 2800 = 292.320.000 VN Thi gian hon vn: T = C/B T = 450.000.000 /292.320.000 = 1,53 nm ( 19 thng) i vi c hi ny, vn u t cao, kh nng thu hi vn lu. Tuy nhin, khi u t gii php ny th lng hi cung cp n nh, c th tng cng sut my xeo. Ngoi ra, li ch mang li khng ch tit kim in m cn gim nhim mi trng nn chng ti kin ngh doanh nghip nn u t gii php ny.

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V.

KT LUN V KIN NGH

V.1. Kt lun Nh my giy Tn Long ang c qu trnh sn xut v kinh doanh tt. Doanh nghip ang c cc nh hng m rng quy m sn xut, u t thm dy truyn sn xut giy cun v sinh cao cp nn vn quy hoch s dng nng lng hp l ang rt c doanh nghip ch trng. Nghin cu kim ton nng lng ch ra cc gii php ci thin/hiu chnh c th mang tnh thc tin cao. Bng 5.1 sau y tm tt cc phng n tit kim nng lng c th. Bng 5.1 - Tng hp chi ph v li ch cc gii php tit kim nng lng TT Hng mc C hi 1 (ECO1): Thay bng n hunh quang thng thng T10 bng bng n hunh quang tit kim in T5 C hi 2 (ECO2): Lp t thit b Powerboss cho ng c my nghin C hi 3 (ECO3): Tn dng nhit khi thi hm nng nc cp cho l hi C hi 4 (ECO4): Thay l hi mi Tng cng Tng chi ph u t (VN) Li ch hng nm (VN) Thi gian hon vn

01

7.900.000

8.179.200

13 thng

02

103.000.000

72.900.000

17 thng

03 04

55.000.000 450.000.000 617,700,000

72.576.000 292.320.000 445.966.200

9 thng 19 thng 17 thng

Tng hp cc phng n c th ny cho thy phng n TKNL tng th cho doanh nghip c tng vn u t l 617.700 triu ng, trong khi li ch em li hng nm l 445,966 triu ng. Nh vn thi gian thu hi vn cho phng n TKNL tng th c thi gian thu hi vn 17 thng. V in nng, mi nm cng ty tit kim c khong 5,92%. Xt v chi ph nng lng, mi nm cng ty tit kim mt khon ln n 10,82%. Vy hiu qu v kinh t l rt ln.

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V.2.

Kin ngh

Bo co ny ch ra cc gii php TKNL nhm gip Nh my nh gi hin trng v tim nng TKNL c th m nu u t vo s c th gim thiu chi ph s dng nng lng. Do , thc hin cc bin php c xut trong bo co ny, chng ti c mt s xut sau y: Nh my tin hnh cn nhc v la chn cc phng n c th, d thc hin v nh gi tin hnh thc hin trong bc u. Cc kt qu c th em li s l ng lc Nh my tin hnh xem xt cc phng n cn li.

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VI.

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