TRNG I HC BCH KHOAKHOA K THUT HA HC__oOo__

PHC TRNH BI TP LN TI:CONTROLLER, MULTIVARIABLE CONTROLLER

GVHD:Thy Bi Ngc PhaSinh vin: Phm Hng Phc Sang 61203101 Lm Thun Thnh - 61203391Hong Thin Th 61203733Nm hc: 2014-2015

MC LCTNG QUAN V PRO/IIGii thiu phn mm PRO/II7 bc s dng phn mm PRO/IIV s quy trnh sn xutnh r nhng thnh phnLa chn nhng phng thc tnh ton nhit ngnh r nhng dng c nhp liuCung cp nhng iu kin cho quy trnhChy m phngXem kt quS mt quy trnh dng phn mm PRO/IINhp d liu v chn thut tonNhp d liuChn thut tonKim tra tin cy ca kt quMt s cng c h trCC THIT B V CNG C C S DNGMixerTng quanMixer setupCompressorTng quanCompressor setupHeat exchanger (Simple HX)Tng quanSimple HX setupFlash Drum (Flash)Tng quanFlash setupFeedback Controller (Controller)Tng quanController setupMultiVariable Controller (MVC)Tng quanMVC setupV D H THNG PHN TCH CN BNG LNG HI (FLASH)t vn v bi tonXy dng h thngNhp cu tChn h nhit ngNhp s cc thit bNhp thng s cc dng nhp liu v dng lnhNhp thng s thit b MixerNhp thng s thit b CompressorNhp thng s thit b Simple HXNhp thng s thit b FlashKhai bo cho ControllerKhai bo cho MVCTin hnh m phngChy m phngXut kt qu cn thit cho h thngTI LIU THAM KHO

TNG QUAN V PHN MM PRO/IIGii thiu phn mm PRO/IIPRO/II l phn mm ca cng ty SIMSCI, dn u trong lnh vc m phng cng ngh t nm 1967. Cng ty SIMSCI l thnh vin ca Intelligent Automation Division, thuc cng ty Invensys.(a ch website:http://www.simsci-esscor.com). Cng ty Invensys hot ng trong lnh vc iu khin t ng, cung cp cc phn mm ng dng trong cng ngh lc ho du, thc phm, nng lng,Phin bn mi nht ca PRO/IIl version 9.3.1 nm 2014 . Phn mm PRO/II l phn mm m phmg tr gip cc k s cng ngh ho hc, du kh, PolimerT vic tch ra du v kh n nhng quy trnh chng ct, PRO / II kt hp nhng nhng ti nguyn d liu ca th vin thnh phn ha hc rng ln v phng php d on thuc tnh nhit ng tin tin nht.PRO/II l cng c tnh ton d dng cc cn bng vt cht v nng lng, nhm m phng quy trnh trng thi n nh; theo di, ti u ha, ci thin nng sutC th vo trang chPRO/II bit chi tit v phn mm,cch dng v nhiu h tr khc,c th ng k mua bn PRO/II.7 bc s dng phn mm PRO/IIV s quy trnh sn xut:Click chn biu tng thch hp cn cho quy trnh sn xut trn PFD Palette v click vo phm vi hot ng ln na th biu tng . Click nt Streams trn PFD Palette chn to dng v click vo u vo v ra ca mi biu tng to dng cho n.nh r nhng thnh phn:Click chn biu tng Component Selection vo danh sch tt c thnh phn trong qu trnh. Chn t hn 1,700 thnh phnuc xy dng trong c s d liu ca SIMSCI bng cch nh vo tn thnh phn, cng thc ha hc hoc la chn n t mt danh sch uc xc nh trc .La chn nhng phng thc tnh ton nhit ng:Click chn biu tng Thermodynamic Data vo danh sch chn cc gi nhit ng cho h thng.nh r nhng dng c nhp liu:Double click vo mi dng nhp liu ngoi ( khng c thit b pha trc dng ) v cung cp cc thng s dng ( lu lng, thnh phn, nhit , p sut ).Cung cp nhng iu kin cho quy trnh:Double click vo mi biu tng cn cho quy trnh sn xut to ra t bc 1 v cung cp d liu ( nhng vng mu ). Khi nhp thng tin, vng d liu s chuyn t mu sang xanh.Chy m phng:Sau khi tt c cc vng khng cn mu ( d liu ), click biu tng Run chy m phng.Xem kt qu:Sau khi chy m phng xong, ta c th xem li nhng kt qu v xp thnh bng s dng bo co.S mt quy trnh dng phn mm PRO/II:

Nhp d liu v chn thut tonNhp d liu:Khi nhp d liu cn ch n tnh hp l cc thng s cng ngh thc t, do thit b c th b h hng v cho kt qu sai m khng bit.Chng trnh mun hi t cc thng s phi tng ng v hi ho vi nhau. Mt thng skhng hp l lm qu trnh tnh ton khng hi t lm khng bit nguyn nhn .Qu trnh nhp d liu ch cn nhp mt phn cc gi tr cn thit, cc thng s cn li c tnh ton khi chy chng trnh.C 3 dng thng s:Thng s khng i: l thng s gi c nh trong sut qu trnh tnh ton nh p sut, nhit , thnh phn dng trch ngang Thng s c lng : l thng s phi khai bo hoc khng cn khai bo tu . i vi thng s ny, b tnh ton xem nh l gi tr u ca thut ton lp, kt qu tnh ton c th khc so vi gitr c lng ban u. Tuy nhin kt qu c lng phi gn k vi gi tr kt qu th chng trnh mi hi t.Thng s khng cung cp: l thng s khng cn nhp, c phn mm qui nh.Khi nhp xong d liu vo, thng s chuyn sang mu xanh. Nu d kin vn cn thiu th c mu v cn b xung cho khi no tt c chuyn sang mu xanh th mi c chy chng trnh.Chn thut ton:Trong qu trnh lp, PRO II cn cc gi tr ban u ca thng s, t PRO II t ng c lng bng cng c IEG da trn cc thng s cung cp.IEG ch c s dng hai thut ton lp I/O v Chemdist trong PRO/II. Khi m phng qu trnh chng ct du m th I/O thng c s dng v gii nhanh v ph hp cho cc h Hydrocacbon.Phng php tnh lp I/O (inside/outside): chia cng vic tnh ton thnh hai vng lp, vng lp ni v vng lp ngoi.Vng lp ni PRO/II gii cc phng trnh ca ct chng ct: phng trnh cn bng vt cht, cn bng nhit v iu kin bin. Vng lp ni dng phng php tnh gn ng nn xc nh cc bin s rt nhanh.Sau khi vng lp ni hi t (sai s gia hai ln lp t yu cu) th PRO/II chuyn sang tnh vng lp ngoi.Ti vng lp ngoi, s tnh cc gi tr nh K ( bay hi tng i ), H (enthalpy) da trn kt qu vng lp ni v thnh phn, nhit . Vic tnh ton cc phng trnh nhit ng c th chim ti 80% thi gian tnh ton v y l cc phng trnh phc tp v thnh phn v p sut.PRO/II chia lm hai vng lp ni v ngoi gim s ln gii cc phng trnh nhit ng, trong c vng lp ni tnh ton gn ng.

Lu tnh ton ca phng php I/OKhi chng trnh khng hi t: C nhiu ngyn nhn dn n khng hi t:Thng s u vo khng chnh xc, d kin b thiu hoc qu chc ch nn khng thc hin c.Do m hnh khng hp l nh khng s mm l thuyt, thut ton chn sai, b tnh ton tnh cht khng ph hpDo thng s mc nh cho phn mm khng thch hp: mc d qu trnh hi t nhng khng s vng lp nn khng c p s, do vy cn phi tng thm s vng lp ti a cho php hoc gim h s dampingSai s khc khe, kh t c Kim tra tin cy ca kt quKhi phn tch kt qu v thy m hnh tnh ton ph hp qui trnh thc t th kim tra tin cy ca kt qu tnh tonbng cch sau :Thay i b tnh ton tnh cht (phi ph hp vi h ang m phng).Thay i cu t gi ca dng nhp liuKhi tng s cu t gi m kt qu tnh ton chnh lch khng ng k th phi ly kt qu mi chnh xc hn .Ni chung bc kim tra tin cy khng nht thit phi c thc hin nu khng c mi nghi ng no c.Mt s cng c h trPRO/II c thm mt s cng c h tr gip nghin cu, ti u ho phng n nhanh chng chnh xc nh :case study , calculation, optimizer.Case study :Cng c ny t ng thay i d liu ban u, sau cho bit s nh hng ca s thay i ny ln cc thng s tnh ton c .V d: nh hng ca sut lng hi lu ln nhit ni un, cho khong gii hn ca sut lng .Case study tnh ton nhanh chng nhit ni un ng vi tng sut lng hi lu nm trong gii hn .Calculation:Cng c tnh ton cho nhiu muc ch khc nhau.Tnh ton cht cc dng c bitM phng thit b cng ngh c bit nh thit b phn ng .Xc nh iu kin vn hnh cho cc thit b khcCc tnh ton c bit theo mun ca ngi s dngTnh ton cc hm chi ph v hiu qu kinh t .Tnh ton cc gi tr cho cng c controller hoc hm mc tiu cho optimizerOptimizer:Cng c Flowsheet optimizer ti u ho hm mc tiu bng cch mt hoc nhiu bin lthng s ca quy trnhHm mc tiu l tiu ch vn hnh , nh ti a ho lng cu t thu hi, ti thiu ho phn mt mt; hay tiu ch v hiu qu kinh t nh ti a ho li nhun, ti thiu ho chi phCC THIT B V CNG C C S DNGMixerTng quan

Mixer setup

CompressorTng quan

Compressor setup

Heat exchanger (Simple HX)Tng quan

Simple HX setup

Flash Drum (Flash)Tng quan

Flash setup

Feedback Controller (Controller)Tng quan

Controller setup

MultiVariable Controller (MVC)Tng quan

MVC setup