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THIẾT KẾ THÁP CHƯNG CẤT HỖN HỢP ACETONE – NƯỚC LOẠI THÁP ĐỆM NĂNG SUẤT 1500 (Kg-h)
[...]... GR = D x R = 1500 x 0.9 = 1350 (Kg/h) tR = tD = 57.5OC QR = 1.806 x 108 (J/h) = 50.18(kW) Nhit lng do hi mang ra nh thỏp Qy : _ Qy = D (1 +R) x D Trong ú: D : Nhit lng riờng ca hi nh thỏp _ _ D = Acetone x y D + Nc x (1 - y D) _ y D = 0.984 Acetone = rAcetone + tD x CAcetone Nc = rNc + tD x CNc tD = 57.5OC rAcetone = 523.35 (kJ/Kg) rNc = 2426.77 (kJ/Kg) Nc = 2667.59 x 103 (J/Kg) Acetone = 655.42... t1,t2: Nhit vo v ra ca nc lm lnh Chn nhit vo v ra ca nc lm lnh l: t1 = 27OC t2 = 40OC _ t 1,2 = t1 + t 2 = 33.5OC rAcetone = 521.46 (kJ/Kg) 2 rNc = 2425.60 (kJ/Kg) _ _ rD = x D x rAcetone + (1 - x D) x CNc = 551.93 x 103 (J/Kg) Sut lng nc cn tiờu tn: _ Gnl = D x(R + 1)x r D = 1500 x(0.9 +1) x551.963 x1000 = 28940.87 4180.94 x( 40 27) Cn x(t 2 t1) (Kg/h) 3 Cõn bng nhit lng ca thit b lm lnh: Phng... riờng pha hi: Mm = ym x Macetone + (1 ym) x Mnc = 0.336 x 58 + (1 0.336) x 18 = 31.44 (Kg/mol) y = M " xT m 0 2 2 4 x T " y 31.44 x 273 22.4 x (88 + 273) = = 1.061 (Kg/m3) Khi lng riờng pha lng: xm = 0.165 SVTH: Vừ Ngc Tip _ x m " = 0.389 - Trang 17- MSSV:69902203 N MễN HC GVHD : Vừ Th Ngc Ti tx = 65OC " = 739.25(Kg / m acetone " = 980.25(Kg / m 3 nuoc _ 1 x " = xm " acetone _ + " " (1 x... b=2a-1=2x8-1=15 H s cp nhit t sn phm nh n thnh thit b: 1 = 1.284 3 r2 à.t.d td T tt1=57.50C tra c : = 748.75(kg/m3) à = 0.23.10-3(Ns/m2) r=523350(J/kg) : n nhit ngng t acetone C=2296.875(J/kg.o) ọ: nhit dung riờng ca acetone = 0.165W/m.: h s cp nhit ca acetone dtd= D 2 nd 2 0.625 2 187x 0.025 2 = = 0.052 D + nd 0.625 + 187x 0.025 t Chn =30C T ú ta tớnh c 1 = 3151(W / m 2 ) H s cp nhit trung bỡnh ca chựm ng:... : h s khuch tỏn trong pha hi (m2/s) 1/ 2 4.3.10 3.T 3 / 2 1 1 Dy = + 2 P(V1 / 3 + V1 / 3) M A M B A B Trong ú: T = 273 + 76.5 = 349.5OK P = 1 at MA = MAcetone = 58 (g/mol) MB = Mhi nc = 18 (g/mol) VA,VB :th tớch mol ca khớ A,B VA = VAcetone =3 x 14.8 + 6 x 3.7 + 7.4 = 74 (cm3/mol) VNc = 18.9 (cm3/mol) Dy = 1/ 2 4.3.10 3.349.51.5 1 1 + 1/ 3 1/ 3 2 1x(74 + 18.9 ) 58 18 = 0.161(cm 2 / s)... Trong ú: _ F = 2783.13(Kg/h) tF = 62.5OC (Nhit i vo ca hn hp u : trng thỏi lng sụi) CF : Nhit dung riờng: tF = 62.5OC CNc = 4188.265(J/Kg.) CAcetone = 2313.125(J/Kg.) SVTH: Vừ Ngc Tip - Trang 11- MSSV:69902203 N MễN HC GVHD : Vừ Th Ngc Ti _ _ CF = X F x CAcetone + (1 - X F ) x CNc = 0.58 x 2313.125 + (1 0.58) x 4188.265 = 3100.684 (J/Kg.) QF = 2738.13 x 3100.684 x 62.5 = 0.53 x 109 (J/h) = 147.395(kW)... 2667.59 x 103 (J/Kg) Acetone = 655.42 x 103 (J/Kg) D = 687.614 (kJ/Kg) Qy = 1.96 x 109 (J/h) = 544.361 (kW) Nhit lng do sn phm ỏy mang ra QW: _ _ Trong ú : W = 1238.12 (Kg/h) , x W = 0.091 tW = 85OC CAcetone = 2386.25 (J/Kg.) CNc = 4200 (J/Kg.) CW = 4034.054 (J/Kg.) QW = 0.424 x 109 (J/Kg) = 117.93 (kW) Nhit lng tn tht ta ra mụi trng xung quanh QXq2: QXq2 = 5% x QD2 Vy : Lng hi t cn thit un sụi dung... " 65 + 88 ty O O wy = t tb hi = = 2 = 5.24 (m/s) = 76.5 C 2 lg àhh = x1 x lg à1 + x2 x lg à2 Trong ú: à1,à2: nht ng lc ca cỏc cu t thnh phn x1,x2: nng phn mol ca cỏc cu t trong hn hp O t x = 62OC à1 (Acetone) = 0.227.103 (Ns/m2), x1 = 0.03 à2(Nc) = 0.4578.103 (Ns/m2), x2 = 0.97 lg àx = 0.03 lg 0.227.10-3 + 0.97 lg 0.4578.10-3 = -3.348 àx = 0.4483.10-3 (Ns/m2) tOy = 76.5OC à1 = 0.2053.10-3 (Ns/m2),... 57.5OC Nhit vo ca sn phm nh t2= 30OC Nhit ra ca sn phm nh t1 = 27OC Nhit vo ca nc lm lnh O t2 = 40 C Nhit ra ca nc lm lnh ttb = 33.5OC Nhit trung bỡnh ca nc lm lnh Cn = 4176.625 (J/Kg.) 33.5OC CAcetone =2252.19(J/Kg.) t = 57.5 + 30 = 43.75OC 2 Cn = 4177.625 (J/Kg.) t=43.75OC CD = 2283(J / Kg.do) rD = 563168(J / Kg.do) Lng nc cn dựng : _ Gn3 = 4 D x(r D + C D (t1 ' t 2 ' )) C n x(t 2 t1)... Trong ú: MB :Khi lng mol ca dung mụi, MB = 18 (g/mol) T: 273 + 62 = 335OK à : nht ca dung dch (cp) àNc = 0.4578.10-3 (Ns/m2) = 0.4578 (cp) : h s kt hp cho dung mụi = 2.6 VA: th tớch mol ca dung cht VAcetone = 74(cm2/mol) ` Dx = (m2/s) 7.4x10 8 (2.6x18) 0.5 x335 = 2.8 x 10-5(cm2/s) =2.8 x 10-9 0 6 0.4578x 74 Pry : Chun s Pran ca pha hi ày 0.2116 x10 3 = 9.197 (N) Pry = D = y y 1.429 x1.61x10 5 Prx 123doc.vn