Pro/II
Pro/II
Chn thut tonTrong 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.
Chn thut tonSau 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.
Chn thut tonLu tnh ton ca phng php I/O:
Khi chng trnh khng hi t: C nhiu nguyn nhn dn n khng hi t: Thng s
u vo khng chnh xc, d kin b thiu hoc qu cht 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 hp,Do 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 damping.Sai 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 quy
trnh thc t th kim tra tin cy ca kt qu tnh ton bng 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 liu.- Khi 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 cCalculatorCalculator l
mt module rt linh hot, nhiu tin ch v c s dng thng xuyn trong qu
trnh m phng quy trnh cng ngh.Cc thng s cho qu trnh tnh ton c ly t
quy trnh v vic tnh ton s dng ngn ng FORTRAN.Tnh nng c bn ca
Calculator:Tnh ton tnh cht ca cc dng c bit.M phng mt s thit b nh
bnh phn ng.Xc nh iu kin vn hnh.Kt qu tnh ton t s liu ca quy trnh
cng ngh.Tnh ton chi ph hoc li nhun kinh t.Phc v cho cng c
Controller v l hm mc tiu ca cng c Flowsheet optimizers.Tin ch ca
Calculator ph thuc nhiu vo ngi s dng.
CalculatorCalculator gm 2 phn chnh : Setup v Procedure.- Setup:
truy xut thng s ca thit b v dng c t s quy trnh; gn cc hng s; thit
lp cc chui cho dng ra v dng vo; xc nh kch thc ca cc mng ch lm vic v
c th m rng nu mun.Procedure: th hin cc php tnh c vit theo ngn ng
FORTRAN, cho php thc hin cc chc nng tnh ton, m rng hay tnh lp. Mt s
hm c th truy xut thnh phn v tnh cht ca dng t s quy trnh. Cc chng
trnh con c bit gip ta tnh ra kt qu trc tip t dng lu cht. Kt qu t
Calculator c s dng cho vic vn hnh cc thit b khc trong quy trnh.
Calculator
Nhn vo Edit/View Declarations trong ca s Calculator m View
Area.
Parameters nhp cc thng s t s quy trnh cho Calculator. Nhng thng
s ny s c truy cp vo Calculator procedure nh l cc phn t ca ma trn
P.Calculator
Calculator parameter m ca s Definition xc nh r thng s t dng hay
thit b trong quy trnh
Constants nhp cc hng s s dng trong qu trnh tnh ton. Nhng hng s
ny s c truy cp vo Calculator procedure nh l cc phn t ca ma trn C.
Tuy cc hng s c th nhp trc tip trong qu trnh vit code phn Procedure,
nhng ma trn C gip ta tp hp tt c nhng hng s c th thay i khi cn.
Calculator
Results nhp tn cho cc kt qu tnh ton. Nhng gi tr ny s c truy cp
vo Calculator procedure nh l cc phn t ca ma trn R v c dng trong bo
co kt qu u ra.
Arrays khai bo ln cho cc ma trn s dng trong Calculator, bao gm
ma trn P, C, R khai bo trc v ma trn IS c dng trong vic s dng gi cc
bin ca dng lu cht.
Calculator
Stream Sequence thit lp trt t cho cc dng. Bng ny c 2 chc nng
chnh: kt ni thng tin dng chy gia cc Procedure v cc dng trong s quy
trnh; kim sot vng lp trong qu trnh thc hin th tc.Khi hon thnh vic
khai bo trong Setup, click Hide Declarations ng ca s View Area.
Calculator
y l phn bt buc trong vic lp trnh cho Calculator. Cc dng lnh theo
ngn ng FORTRAN c nhp trc tip vo Procedure trong ca s chnh ca
Calculator.* Mt s im lu :- Mi hng lnh cha ti a 80 k t, ta c th s
dng k hiu & t cui hng lnh biu th s ni tip vi hng lnh di tip
theo.- Tt c cc dng lnh, tr lnh PROCEDURE, c th c bt u bng mt dy s t
1 n 99999.- Nhng k t pha sau du $ c xem l ch thch thm.* Cc bin s c
nh ngha sn:Cc bin ny bao gm kch thc cho cc ma trn. Ta c th dng lnh
DIMENSION trong phn Calculator setup t li s phn t ca mi ma trn.* Mt
s dng thng dng: AnTrong A l mt trong cc ma trn C, P, V, R hay B v n
l mt s nguyn ch ra s phn t n ca ma trn . A(index)Trong A l mt trong
cc ma trn C, P, V, R hay B v (index) l mt biu thc c t trong ngoc n.
A(n) AnCalculator procedureCalculator
Calculator procedureVariable Nameand FormDefault Dimension(for
arrays)Description and CommentsCn or C(index)1
