一个简单的DSTWU模拟,结果相差很大,请教原因
attach://20244.bkpattach://20243.bkp1、进料:25℃ 1bar
ETHYL-01 CONV ETHYLBENZENE C8H10-4
STYRE-01 CONV STYRENE C8H8
HYDRO-01 CONV HYDROGEN H2
WATER CONV WATER H2O
kmol/h
ETHYL-01 80.67
STYRE-01 45.764
HYDRO-01 0.026
WATER 0.373
2、uniquac
3、DSTWU条件:
回流比:-1.2
轻组分回收率:0.999(ethyl-01)、重组分回收率:0.001(styre-01)
冷凝器压力:101.325kpa
再沸器压力:121.59kpa
冷凝器:partial condenser with vapour and liquid distillate,V/F=0.0003
附件中的两个模拟的结果相差甚远,原因何在???请指教!
没人回答?资格顶一下! ahhooyang 发表于 2012-9-29 13:55 static/image/common/back.gif
没人回答?资格顶一下!
差3600倍。一个是每小时,一个是每秒。拜托别再浪费大家的流量。
看清楚单位,计算要细心! 比较结果仔细分析,细心很重要啊 进料和出料的结果没有差异,差在塔数据上。
谢谢楼上的几位。虽然单位不同,但是换算结果是一致的。
第一结果:
Temperature C 68.7942018 25 152.506158
Pressure bar 1.01325 1 1.2159
Vapor Frac 0.00030002 5.8615e-06 0
Mole Flow kmol/hr 81.034094 126.833 45.798906
Mass Flow kg/hr 8567.49814 13337.6864 4770.1883
Volume Flow cum/hr 11.0546059 15.2345779 6.12283772
Enthalpy MMBtu/hr -0.3890817 3.37833963 5.6091379
Mole Flow kmol/hr
ETHYL-01 80.58933 80.67 0.08067
STYRE-01 0.045764 45.764 45.718236
HYDRO-01 0.026 0.026 6.0619e-13
WATER 0.373 0.373 2.0397e-11
第二结果
Temperature C 68.796693 25 152.528608
Pressure kPa 101.325 100 121.59
Vapor Frac 0.00030002 5.0582e-06 0
Mole Flow kmol/sec 0.02250947 0.03523138 0.01272191
Mass Flow kg/sec 2.37986061 3.70491293 1.32505231
Volume Flow cum/sec 0.00307073 0.00423112 0.00170083
Enthalpy MMkcal/hr -0.0980211 0.86608305 1.41357147
Mole Flow kmol/sec
ETHYL-01 0.02238592 0.02240833 2.2408e-05
STYRE-01 1.2712e-05 0.01271222 0.01269951
HYDRO-01 7.2222e-06 7.2222e-06 1.6839e-16
WATER 0.00010361 0.00010361 5.6658e-15
而塔数据差异大:
第一个结果:
Minimum reflux ratio: 3.51139282
Actual reflux ratio: 4.21367139
Minimum number of stages: 32.6801353
Number of actual stages: 61.7215643
Feed stage: 32.9928819
Number of actual stages above feed: 31.9928819
Reboiler heating required: 4.4530891 Gcal/hr
Condenser cooling required: 3.98897765 Gcal/hr
Distillate temperature: 68.7942018 C
Bottom temperature: 152.506158 C
Distillate to feed fraction: 0.63890387
第二个结果:
Minimum reflux ratio: 6.70051987
Actual reflux ratio: 8.04062384
Minimum number of stages: 64.5045021
Number of actual stages: 118.916164
Feed stage: 60.6792553
Number of actual stages above feed: 59.6792553
Reboiler heating required: 8472124.71
Condenser cooling required: 7949401.72
Distillate temperature: 68.796693
Bottom temperature: 152.528608
Distillate to feed fraction: 0.63890387
HETP:
希望各位继续赐教。
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