gioi thieu pinch technology (1).pptx

Slide 1

10/29/2014CC VN CN QUAN TM CA NH MY CNG NGHIP

GII THIU K THUT PINCH TECHNOLOGY

1


10/29/2014


10/29/2014

ngha ca k thut Pinch TechnologyK thut Pinch Technology k thut phn tch h thng gim thiu tiu th nng lng ca cc qu trnh cng ngh bng cch tnh ton ti u ha h thng trao i nhit, phng php cung cp nng lng v iu kin vn hnh qu trnh cng ngh.

10/29/2014


PinchHa duLc duThc phmLuyn kimBt giyMc tiuTit kimNng lng tiu th10 35%Lng nc tiu th25 40% Lng H2 tiu th 20% Ha hc4Pinch nng lng Khi nim: Pinch nng lng l k thut phn tch h thng nhm tit kim nng lng s dng trong qu trnh. C s xy dng phng php: Cn bng vt cht v nng lng.ng dng k thut Pinch trong thc t tit kim nng lng ng kLc du : 10-25%Ha du: 15-25%St v thp: 10-30%Ha hc: 15-35%Thc phm v ung: 20-35%Bt giy v giy: 15-30%10/29/2014


Cc khi nim s dng trong k thut phn tch Pinch


ng t hp (Composite curve)L ng tng hp ca tt c cc ng c tnh T - H ca cc dng cng ngh trong qu trnh.C hai dng ng t hp:

ng t hp nngng t hp nguiTminPinch Point DTmin (Tmin)L chnh lch nhit nh nht gia hai ng t hp. im Pinch (Pinch point)L im ng vi gi tr DTmin- ng t hp nngng t hp ngui66Cc khi nim s dng trong k thut phn tch Pinch


Xy dng ng t hpH = m.Cp.(Tcui Tu) = CP.(Tcui Tu) Lng trao i c tnh theo cng thc:ng t hp c xy dng trn gian T H theo nguyn tc tng CP:

Trong :H : Lng nhit trao i (KW) m : Lu lng khi lng (kg/s) Cp : Nhit dung ring khi lng (Kj/kg oC) CP : Nhit dung ring lu lng (KW/oC)Tu (cui) : Nhit u (cui) ca cc dng7Cc khi nim s dng trong k thut phn tch Pinch


TH(1)(2)TH(1)(2)CP1CP1 + CP2CP1Xy dng ng t hp8Cc khi nim s dng trong k thut phn tch Pinch


Xy dng ng t hp

ng t hpB mt truyn nhit S lng HX

Qc minQh minA1A2A3A4A5A6 A = A1 + A2 + A3 + A4 + A5 + A6 =

Hi : Lng nhit trao i trn tng onTi: Chnh lch nhit trung bnh logarit ca tng onKi: H s truyn nhit ca tng thit b

9

Cc khi nim s dng trong k thut phn tch Pinch Gin cc ng cong t hp

Cc thng s ca cc dng cng ngh Nhit vo, ra Bin thin enthalpyng t hp nng:Tng ca cc dng cng ngh nng trong qu trnh ng t hp lnh:Tng ca cc dng cng ngh lnh trong qu trnh Nhu cu gia nhit ti thiuNhu cu lm lnh ti thiuim Pinch10/29/2014


10 im Pinch:

Cc khi nim s dng trong k thut phn tch PinchGin cc ng cong t hpim gn nht gia hai ng cong t hp tng ng vi s chnh lch nhit ti thiu Tmin gia chng.Chia cc ng t hp thnh hai vng: Trn Pinch Sink (Tiu th), Di Pinch Source (Ngun)


Quy tc Pinch:


Gin cc ng cong t hp Nhit khng c truyn qua Pinch Khng c s lm lnh bn ngoi pha trn Pinch Khng c s gia nhit bn ngoi pha di Pinch




QhminQcminTHTminQhminQcminTHTminTminQcmin & QhminChi ph vn hnhLng nhit thu hiB mt trao i nhitChi ph u t13nh hng ca Tmin n chi ph sn xut13 La chn Tmin:

Gi tr Tmin quan h mt thit vi chi ph u t v vn hnh ca mt qu trnh cng ngh.

Cc khi nim s dng trong k thut phn tch PinchChi phDTminDTmin ti uChi ph tng (TAC)Chi ph vn hnh (OC)Chi ph u t (CC)


La chn Tmin da vo: Hnh dng ng cong t hpKinh nghim thc tin: Lc du: 20-40 0CHa du: 10-20 0CCng ngh ha hc: 10-20 0CCc qu trnh nhit thp: 3-5 0C14Cc khi nim s dng trong k thut phn tch Pinchng cong t hp tng

Tmin +1/2 Tmin -1/2 Tmin H, KW T OCng t hp nngng cong t hpT OCH, KW im Pinchng t hp dch chuynT OCH, KW ng cong t hp tng im Pinchng t hp lnhT OCH, KW ng t hp tngT OCH, KW ng t hp tng QH,MIN QC,MINPinch ph trPinch qu trnhLPSHPSCWLa chn mc ph tr thch hp v t mc tiu ti trng nhit ti u cho mc ph tr chn10/29/2014


H thng trao i nhit (HEN): H thng trao i nhit l mt tp hp cc thit b trao i nhit xy ra qu trnh trao i nhit gia cc dng nng v lnh t c nhit mong mun. Dng: Trn s li, dng c th hin l mt ng thng chy di t nhit u n nhit cui. Trong :Cc dng cng ngh (ph tr) nng c biu din bng mu .Cc dng cng ngh (ph tr) lnh c biu din bng mu xanh. Mt s khi nim ca h thng trao i nhitNhnh: Nhnh c chia ra t mt dng nht nh v c t trng bng h s chia dng f: CPnhnh = f.CPdng 1234NhnhDng nngThit b lm lnhThit b gia nhitThit b trao i nhitDng lnhim PinchTIU THNGUN


E1E2E4E5E3Vng ti nhit knng ti nhit hXc nh cc vng v ng ti nhitVng ti nhit kn: Vng ti nhit kn l mt vng kn ni cc thit b trao i nhit. ng ti nhit h: ng ti nhit h l mt ng thng ni mt dy cc thit b trao i nhit m hai u l hai thit b c s dng tc nhn ph tr cp v ly nhit.nh gi h thng trao i nhit:Ci thin thit k nhm gim chi ph h thng10/29/2014


1. Khng tch cc dng c cng tnh cht nhit v ha hc trn s hin c 2. Khng t hp cc dng c nhit khc nhau3. Khai thc d liu ti cc nhit c hiu qu ca cc dng cng ngh4. m bo tnh chnh xc ca d liu khi trch xut5. Khng trch xut d liu ca cc dng ph tr thun ty6. Nhn dng d liu mm khi trch xut Nhit vo, raLu lngCng sut nhitNhit ha hi Khi lng ringCc nguyn tc cn tn trng khi trch xut d liu D liu cn cho qu trnh phn tch Pinch

Cn bng vt cht v nng lng


18 D liu cn thit cho qu trnh phn tch Pinch


19 D liu cn thit cho qu trnh phn tch Pinch


20


V d p dng

Nhit CP1 = 0.4kW.C-1CP2 = 0.5kW.C-1CP3 = 0.3kW.C-1CP4 = 0.65kW.C-121


22


Tmin = 76,67C23


Tmin = 10C

24


ng cong t hp tng - Grand Composite CurveTmin = 10C













29



30



31



32



Mt dng ph tr nng Single hot utility33



a dng ph tr nng Multi hot utility Gim tn tht nhit34


CP1CP2CP3CP4Nhit THIT K H THNG TRAO I NHITHeat Exchanger Network Design35


THIT K H THNG TRAO I NHITHeat Exchanger Network Design

CP1,36


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignK thut Pinch cho php ti a vic thu hi nhit

S thu hi nhit nn thit k vi s lng nh nht cc thit b trao i nhit Bo m tnh kinh t

Nhiu phng n c th c thit lp

TI U HA

37


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignCc nguyn tc cn quan tm khi thit k theo k thut Pinch: Khng s dng dng ph tr nng di im pinch v dng ph tr lnh trn im pinch Khng s dng cc dng c chnh lch nhit ln trong cng 1 thit b Kt hp dng nng v dng ngui c nhit dung lu lng (CP) tng ng Ti a kh nng thu hi nhit Chnh lch nhit trong mi thit b trao i nhit nn bng hoc ln hn im Pinch (dTmin).

38


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignPha Trn PinchKt hp cc dng trong HX theo nguyn tc

CPH < CPC

CPH < CPCCPH > CPC39


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignPha Di Pinch

Kt hp cc dng trong HX theo nguyn tc sau:

CPH > CPC

40



CP1,41


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignCP1,Pha Trn PinchCPH < CPC

42


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignCP1,Pha Trn PinchCPH < CPC

43


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignCP1,Pha Di PinchCPH > CPC44



CP1,Pha Di PinchCPH > CPC45



CP1,H thng trao i nhit cho php ti a lng nhit thu hiTi thiu chi ph vn hnhChi ph sn xut? 46


THIT K H THNG TRAO I NHITHeat Exchanger Network DesignHai thit b trao i nhit trong vng nhit kn nn gim cn mt thit b.

THot, inTCold, inTHot, inTCold, inTHot, outTCold, outTHot, outTCold, out47


48


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGY49


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):1. Nng lng (Energy) 2. Quan h giachi ph u t v Nng lng (Capital and energy)3. Thay i cng ngh (Process modifications) 4. a dng ha ngun ph tr (Multiple utility levels)5. Lp t ng c nhit hay bm nhit (Placement of heat engines and heat pumps) (section 8).50


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):Nng lng - Energy Ti thiu nng lng cung cpNhit khng c truyn qua Pinch Khng c s lm lnh bn ngoi pha trn Pinch Khng c s gia nhit bn ngoi pha di Pinch

51


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):2. Quan h gia chi ph u t v Nng lng - Capital and energy Din tch trao i nhit lp t v Nng lng cn cung cpPh thuc vo DTmin c chn Thit k mi (New Design):Mc tiu din tch b mt lp t ti thiuS lng thit b trao i nhit lp t ti thiuLp t HX b sung (Retrofit): Tit kim nng lng cho cc s cng ngh ang hot ng

52


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):2. Quan h gia chi ph u t v Nng lng - Capital and energy Thit k mi- Mc tiu din tch b mt lp t ti thiu

53


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):2. Quan h gia chi ph u t v Nng lng - Capital and energy Thit k mi- S lng HX lp t ti thiu (Umin): ph thuc ch yu vo tng s dng cng ngh v ph tr (N) c mt trong h thng trao i nhit

- Phng trnh ny p dng ring bit cho tng vng ca Pinch gi l Yu cu nng lng ti thiu (minimum energy Requirement MER network)- Khng c truyn nhit qua Pinch: H thng chia lm 2 vng c lp: Trn Pinch v Di Pinch

54


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):2. Quan h gia chi ph u t v Nng lng - Capital and energy Lp t HX b sung - RetrofitBo m hiu qu b mt trao i nhit ()

55


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):2. Quan h gia chi ph u t v Nng lng - Capital and energy Lp t HX b sung (Retrofit) da trn gin Nng lng Dtmin

56


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):3. Thay i cng ngh - Process modifications Nhu cu nng lng ti thiu ph thuc vo cn bng vt cht v nng lng ca cng ngh (QCmin, QHmin) Thay i cn bng vt cht v nng lng Gim nhu cu nng lngCc thng s vn hnh c th thay i: p sut lm vicT s hi lu bc hi ca nguyn liuLu lng hi lu tun hon chuyn ha 57


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):3. Thay i cng ngh - Process modifications Nguyn tc Cng Tr (Plus-Minus Principle)TRN IM PINCH (above the pinch) Tng Enthalpy ca dng nng Gim Enthalpy ca dng nguiGim tiu hao ph tr nng

DI IM PINCH (below the pinch) Gim Enthalpy ca dng nng Tng Enthalpy ca dng ngui Gim tiu hao ph tr ngui

58


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):4. a dng ha ngun ph tr - Multiple utility levels Nhu cu ph tr c th thng qua cc ngun khc nhau: cc dng hi nc, cc dng lm mt, dng du nng, khi l. Mc tiu: Ti a vic s dng ph tr gi tr thp

59


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYPhn tch Pinch da trn cc mc tiu (targets):

5. Lp t ng c nhit v bm nhit - Placement of heat engines and heat pumps ng c nhit v Bm nhit l cc thnh phn chnh ca h thng ph trng c nhit: Cung cp Nhit qu trnh v Sn xut nng lng Lin kt h thng trao i nhit v ng c nhit Lp t b sung ng c nhit: Hiu qu nng lng ti aBm nhit: Nhn nhit nhit thp v s dng cng c kh mang nhit n nhit caoBin php s dng nhit thi vo cc mc ch cp nhit c ch60



5. Lp t ng c nhit v bm nhit - Placement of heat engines and heat pumpsLP T ng c nhit:

61



5. Lp t ng c nhit v bm nhit - Placement of heat engines and heat pumpsLP T ng c nhit HP L:

KHNG HP LHP LHP L62



5. Lp t ng c nhit v bm nhit - Placement of heat engines and heat pumpsNGUYN L HoT NG bm nhit:

63



5. Lp t ng c nhit v bm nhit - Placement of heat engines and heat pumpsLP T bm nhit HP L:

KHNG HP LKHNG HP LHP L64


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYTch dng trong thit k h thng trao i nhit:

Bo m khng vi phm quy tc CP vng gn PinchCP gia cc dng khng sai bit qu ln

65


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYTch dng trong thit k h thng trao i nhit:

Bo m khng vi phm quy tc CP vng gn PinchCP gia cc dng khng sai bit qu ln

66


THIT K H THNG TRAO I NHIT P DNG PINCH TECHNOLOGYHeat Exchanger Network Design KEY STEPS IN PINCH TECHNOLOGYTch dng trong thit k h thng trao i nhitQUY TC TCH DNG TRONG THIT K H THNG TRAO I NHIT

67

gioi thieu pinch technology (1).pptx

Documents