Che Bien Khi - Chuong2 - Gian Do Pha
Transcript of Che Bien Khi - Chuong2 - Gian Do Pha
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CNG NGH
CH BIN KH
Trng i hc Cng nghip
TS. Nguyn Mnh Hun
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
Gin pha in hnh cho n cht trong h ta P, V, T, gm
Hnh II.1. Gin pha P-V-T cho n cht
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
I. Trng thi pha ca n cht trong h trc p sut- nhit
Hnh II.2. S trng thi pha ca n cht
trong h trc P - T
Cc ng HD, HC v FH:ccng cn bngH: im ba pha
FH:pha rnc ththnghoathnh kh
HD: ng cn bng giapha rn v lng (ng boha rn lnghoccn bngrnlng).
HC: ng cn bng hi lng, ng p sut hi,ng im bong bnghayng im sng.C- im ti hn vi nhit
ti hn (Tc)v p sut ti hn(Pc).
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
Hnh II.3. Ap sut hi ca n-parafin theo im si chun
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
II. Gin pha ca h a cu t
Hnh II.4. Gin pha in hnh cho h acu t
Mt s k hiu:Cricondenbar- im N.Cricondentherm- im M.Vng thoi ha (ngng t
ngc).ng cht lng - % hi cnh, qua C v song song ving bong bng v ng imsng.ng to bong bng - 0% hi
ng im sng - 100% hi.ng ABDE: qu trnh ngng tngc ng
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
III. 1Tc ng ca thnh phn h.
Hnh II.5. nh hng cathnh phnln bao phaca h metan-propan.
Hnh II.6. V tr qu tch tihn ca mt s h nh
nguyn
metan + propan: thnh
phn nh hng n dng
v v tr ca bao pha.Qu tch ti hn - ngni tt c cc nh cabao pha, bt u t Cca metan n C propan
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
III.2 nh hng ca tp cht
Hnh II.7. nh hng caCO2, H2v N2ln bao pha
ca kh thin nhin
a) CO2
c) N2
b) H2S
P
T
P
TP
T
Cc tp cht phihydrocarbon: nc, CO2,H2S v N2.
Nc c p sut hi boha thp v khng trn lntrong hydrocarbon lng
khng nh hng lndng bao phanh hng ca CO2,H2S v N2:
+Thm lng CO2 vH2S: pha cht lng dy
c s c hnh thnh p sut thp+ Etan, propan v butan:
tng t.+ N2: gim kh nng
trn ln.
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
IV. 1 ng dng ca gin pha trong ch bin kh
Hnh II.8. ng dng bao pha biu din cc
loi ging du, kh
Ging (1):ging du en: ch di bo ha. Ti im im bongbng: hn hp du v kh bo ha.Ging (2): ging du nh: bn triim C.T l kh : du > b du en (1).Du c mu sng hn.Ging (3): gia C v M : b kh-condensat: gim Pto cht lng,
vn tc kh c th b thay i .Tiim sng: thnh phn kh trongging kh c th thay i.Ging (4): kh thc: trn imcridentherm: cht lng khng th tothnh bt c p sut no.
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
Hnh II.9. Cc bao pha c trng cho 4 loiging du- kh
IV. 2 ng Bao Pha
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
IV.3 ng dn p sut cao
Hnh II.10. ng dn p sut cao
I v J : iu kin T v P tiu vo ng v ra khi ng.IJ ct ng im sng:
c cht lng hnh thnhTrnh to cht lng trongng dn kh bng hai cch:
+ Loi phn nng trongkh
+ Thay i iu kin u
vo v ra khi ng: IJ MN
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Cng nghchbinkh
Gin pha v ng dng trongch bin kh
IV.4 Bm Cht Lng
Hnh II.11. Bm Cht Lng
B
C
A
...
P
T
Lng
Hi
ng p sut hi
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Cng nghchbinkh
Hng s cn bng pha
I. nh ngha:
- L i lng c trng cho s phn b cc cu tgia cc pha trong iu kin cn bng
Ki = yi/xi
- L hm s phc tp ca p sut, nhit v thnhphn ca cc pha cn bng trong h.
Trng hp l tng: Ki = Pi/P (nh lut Raoult Dalton)
Phng php tnh hng s cn bng pha:+ Bng phng php gii tch+ Bng phng php th
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Cng nghchbinkh
Hng s cn bng pha
II. Phng php gii tch tnh hng s cn bng pha
-Benedict Webb Rubin
-Redl ich Kwong
-LeeErbar Edm ister
-Kalasnicow - Kl imenco
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Cng nghchbinkh
Hng s cn bng pha
III. Phng php th tnh hng s cn bng pha
STT Phngphp lchtrung bnh (%)
1
2
3
4
5
NGPA
Neyrey
Rzaca
Winn
Myers v Lenoir
8.5
7.8
9.3
10.0
7
C h h bi kh
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Cng nghchbinkh
Hng s cn bng pha
IV. ng dng hng s cn bng pha
1. Xc nh im bong bng
2. Xc nh im sng
3. Xc nh im chp chy
4. Xc nh pha ca hn hp (lng, hi,)
C h h bi kh
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Cng nghchbinkh
Hng s cn bng pha
V. Bi tp:
Xc nh hng s cn bng pha theo phng php Neyrey
Nhm % Cut
C1 C2 C3 n-C4 n-C5
Ttc 0.8645 0.0486 0.0472 0.0212 0.0185