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1、低温甲醇洗碳吸收塔模拟计算崔静思我，没有学过英语，关键也怕学，所以化工模拟的软件就用不了，做简单的、整套低温甲醇洗工艺设计，不会模拟软件也应该能大概的计算出来。当然，期间遇到太多、太大的难度，前后计算中稍作变动，必须重复计算，反复迭代。其中低温甲醇洗二氧化碳吸收塔的模拟计算困扰了很久，但是可以做出来的。 这里只想把自己的思路分享与你。1.工艺气参数：压力5.43mpa，温度-35C，氢气60%，一氧化碳28%，二氧化碳12%净化气目标参数：二氧化碳12%(不问怎么没有硫，硫已经在脱硫塔脱除。)要求：用尽量少的甲醇(甲醇99.7%，水0.3%)。2.选定参数：出塔甲醇含二氧化碳20%3.如图:图
2、13.1设定吸收塔段数吸收塔分段目的：补充吸收过程所需冷量。吸收塔设置为三段3.2设定每段吸收量，假定为三分之一3.3温度温度决定了甲醇对二氧化碳吸收的效果，且有如下关系物料02、05间关系XCO2=K1*P*Y/PCO2 物料01、05间关系XCO2=K2*P*Y/PCO2 、关系式中的PCO2是该温度下二氧化碳的饱和压力、Y是气体中二氧化碳的含量(m/m)，K1不等于K2且K2小于K1，一般公式中K取0.425，吸收过程中K2、K1的一般经济取值在0.350.40间，两者间差距小表明塔盘吸收效果差，但XCO2就越大，段间塔盘数就应该越多，所需甲醇循环量就越少；反之XCO2就越小，段间塔盘数
3、就应该越少，所需甲醇循环量就越多。出塔甲醇含二氧化碳20%(设计目标值)时，出塔甲醇经济温度应该为-35度。K1=201.20385.4312=0.3695=经过计算，吸收塔分三段，热力学计算上不容易通过，改为四段。(如图2 )图2 热力学参数：二氧化碳吸收放热：16945KJ/Kmol甲醇、富甲醇比热：2.232.306KJ/KG计算结果：16#物料入塔工艺气 物料号16物料叙述工艺气流量 kmol/h13624.17636流量 NM3/h(G)305369.564流量 kg/h196423.4351压力 Mpa(A)5.44温度 ()-52焓变 KJ/h%(mol)Kmol/hkg/hH2
4、2.01659.574573788116.54499616361.98N228.010.29828780840.639256991138.447CO28.0128.078927683825.522625107153.3Ar39.950.13015071817.73196334708.3565CH416.040.10458462314.2487935228.5857CO2(G)44.0111.813475391609.48872170832.79H2S34.0800COS60.7500CH3OH32.0400H2O18.0200CO2(L)44.010合计10013624.17636196423
5、.417#物料过程气物料号17物料叙述工艺气流量 kmol/h13253.7641流量 NM3/h(G)297067.2179流量 kg/h180108.5578压力 Mpa(A)5.42温度 ()焓变 KJ/h%(mol)Kmol/hkg/hH22.01661.229809498115.25451116359.38N228.010.30650832240.62388991138.017CO28.0128.847881643823.430181107094.7Ar39.950.13370625917.72111214707.923CH416.040.10736935714.2304812522
6、8.2919CO2(G)44.019.3107815271234.0290254309H2S34.0800COS60.7500CH3OH32.040.06388.455901498270.9428H2O18.020.00014340.0190058980.342397CO2(L)44.010合计10013253.7641180108.618#物料过程气物料号18物料叙述工艺气流量 kmol/h13063.78309流量 NM3/h(G)292809.0214流量 kg/h171832.8051压力 Mpa(A)5.4温度 ()焓变 KJ/h%(mol)Kmol/hkg/hH22.01662.1
7、14631318114.520716357.9N228.010.31089887540.615154691137.772CO28.0129.258301743822.241075107061.4Ar39.950.13560349317.71494618707.6767CH416.040.10885121614.2200867228.1252CO2(G)44.018.0291177611048.90652846161.85H2S34.0800COS60.7500CH3OH32.040.04255.552107812177.8999H2O18.020.00009560.0124889770.224
8、992CO2(L)44.010合计10013063.78309171832.819#物料过程气物料号19物料叙述工艺气流量 kmol/h12720.3793流量 NM3/h(G)285112.0375流量 kg/h156820.0687压力 Mpa(A)5.38温度 ()焓变 KJ/h%(mol)Kmol/hkg/hH22.01663.781440898113.24120416355.32N228.010.31917231340.59992891137.345CO28.0130.031879353820.168964107003.3Ar39.950.13917983217.7042026707
9、.2475CH416.040.11164756914.20199422227.8349CO2(G)44.015.581200346709.949853431244.54H2S34.0800COS60.7500CH3OH32.040.03544.503014272144.285H2O18.020.00007970.0101381420.182641CO2(L)44.010合计10012720.3793156820.120#物料净化气物料号20物料叙述净化气流量 kmol/h12232.36811流量 NM3/h(G)274173.8524流量 kg/h137467.7117压力 Mpa(A)5.
10、38温度 ()焓变 KJ/h%(mol)Kmol/hkg/hH22.01666.07629048082.69507716293.74N228.010.32895011640.238389051127.217CO28.0130.829428063771.169128105630.8Ar39.950.14265879117.45054852697.1145CH416.040.11266607613.78172914221.0928CO2(G)44.012.5305.809202813458.51H2S34.0800COS60.7500CH3OH32.040.011.22323681139.1947
11、8H2O18.020.000006550.000801220.014434CO2(L)44.010合计10012232.36811137467.7250#物料贫甲醇物料号250物料叙述贫甲醇流量 kmol/h4757.012266流量 NM3/h(G)106622.7215流量 kg/h152223.3472压力 Mpa(A)5.38温度 ()-52焓变 KJ/h%(mol)Kmol/hkg/hH22.01600N228.0100CO28.0100Ar39.9500CH416.0400CO2(G)44.0100H2S34.0800COS60.7500CH3OH32.0499.74742.741
12、229151966.3H2O18.020.314.2710368257.0967CO2(L)44.010合计1004757.012266152223.3251#物料富甲醇物料号251物料叙述富甲醇流量 kmol/h5240.5103流量 NM3/h(G)117459.7498流量 kg/h171431.2366压力 Mpa(A)5.4K0.342温度 ()-31.5P0CO21.336560189焓变 KJ/h%(mol)Kmol/hkg/h亨利系数H22.0160.5828845830.5461264361.57733588.7N228.010.0068989440.36153984710.
13、12799248.9CO28.010.93502031848.999836061372.49172.8Ar39.950.0048402550.25365407910.13297154.7CH416.040.0080195450.4202650816.74208674.9CO2(G)44.017.711856813404.140650617786.03吸收热6848163 H2S34.0800甲醇冷量-6980734 COS60.7500CH3OH32.0490.478173324741.517992151927.1H2O18.020.27230622114.27023558257.0823CO
14、2(L)44.010合计1005240.5103171431.2252#物料富甲醇物料号252物料叙述富甲醇流量 kmol/h5240.5103流量 NM3/h(G)117459.7498流量 kg/h171431.2366压力 Mpa(A)5.4温度 ()-51焓变 KJ/h%(mol)Kmol/hkg/hH22.0160.5828845830.5461264361.57733N228.010.0068989440.36153984710.12799CO28.010.93502031848.999836061372.49Ar39.950.0048402550.25365407910.1329
15、7CH416.040.0080195450.4202650816.742086CO2(G)44.017.711856813404.140650617786.03H2S34.08000COS60.75000CH3OH32.0490.478173324741.517992151927.1H2O18.020.27230622114.27023558257.0823CO2(L)44.010合计1005240.5103171431.2253#物料富甲醇物料号253物料叙述富甲醇流量 kmol/h5585.772955流量 NM3/h(G)125198.3979流量 kg/h186503.4761压力 M
16、pa(A)5.42K0.35温度 ()-36.4P0CO21.140688893焓变 KJ/h%(mol)Kmol/hkg/h亨利系数H22.0160.56976220331.8256230664.15664588.7N228.010.0067450940.37676564310.55452248.9CO28.010.91432192951.071947061430.53172.8Ar39.950.0047334120.26439765710.56216154.7CH416.040.0078477510.4383575647.03233474.9CO2(G)44.0113.3033929574
17、3.097325332703.34吸收热5743621 H2S34.0800甲醇冷量-5771678 COS60.7500CH3OH32.0484.937605314744.421786152020.1H2O18.020.2555913514.2767525257.1997CO2(L)44.010合计1005585.772955186503.5254#物料富甲醇物料号254物料叙述富甲醇流量 kmol/h5585.772955流量 NM3/h(G)125198.3979流量 kg/h186503.4761压力 Mpa(A)5.42温度 ()-45焓变 KJ/h%(mol)Kmol/hkg/hH
18、22.0160.56976220331.8256230664.15664N228.010.0067450940.37676564310.55452CO28.010.91432192951.071947061430.53Ar39.950.0047334120.26439765710.56216CH416.040.0078477510.4383575647.032334CO2(G)44.0113.30339295743.097325332703.34H2S34.08000COS60.75000CH3OH32.0484.937605314744.421786152020.1H2O18.020.255
19、5913514.2767525257.1997CO2(L)44.010合计1005585.772955186503.5255#物料富甲醇物料号255物料叙述富甲醇流量 kmol/h5775.75397流量 NM3/h(G)129456.5943流量 kg/h194779.2288压力 Mpa(A)5.42温度 ()-37P0CO21.130435462焓变 KJ/h%(mol)Kmol/hkg/h亨利系数H22.0160.56372612132.5594338265.63591588.7N228.010.0066744680.38550085510.79922248.9CO28.010.904
20、83517652.261053631463.837172.8Ar39.950.0046844730.27056361710.80848154.7CH416.040.0077695850.4487521117.19908874.9CO2(G)44.0116.07097223928.219816940850.49吸收热3136901 H2S34.08000甲醇冷量-3386903 COS60.75000CH3OH32.0482.194040894747.32558152113.1H2O18.020.24729705414.28326942257.3171CO2(L)44.010合计1005775.
21、75397194779.2256#物料富甲醇物料号256物料叙述富甲醇流量 kmol/h流量 NM3/h(G)0流量 kg/h194779.2288压力 Mpa(A)5.42温度 ()-52焓变 KJ/h%(mol)Kmol/hkg/hH22.0160.56976220332.5594338265.63591N228.010.0067450940.38550085510.79922CO28.010.91432192952.261053631463.837Ar39.950.0047334120.27056361710.80848CH416.040.0078477510.4487521117.19
22、9088CO2(G)44.0113.30339295928.219816940850.49H2S34.0800COS60.7500CH3OH32.0484.937605314747.32558152113.1H2O18.020.2555913514.28326942257.3171CO2(L)44.010合计1005775.75397194779.227#物料出塔富甲醇物料号27物料叙述富甲醇流量 kmol/h6148.820509流量 NM3/h(G)137818.4331流量 kg/h211179.0705压力 Mpa(A)5.44温度 ()-37P0CO21.1215焓变 KJ/h%(m
23、ol)Kmol/hkg/h亨利系数H22.0160.55051075533.849918268.23737588.7N228.010.0065194280.40086793711.22971248.9CO28.010.88396624254.353497561522.447172.8Ar39.950.0045767290.28141482311.24196154.7CH416.040.0075959990.4670643657.49286174.9XCO2=0.37*PCO2/P0CO2CO2(G)44.0121.202107241303.67951857374.28吸收热6362165 H2S34.0800甲醇冷量-6451155 COS60.7500CH3OH32.0477.112642754741.517992151927.1H2O18.020.23208086114.27023558257.0823CO2(L)44.010合计1006148.820509211179.1顺藤摸瓜，假以热力学数据，做整个塔吸收逐层塔盘的计算。这只是计算中的部分数据，限于知识水平低、个人阅历潜，凭兴趣爱好摸索，错误在所难免，希望得到您的指导、更正，先对您表示感谢！