1、低溫甲醇洗碳吸收塔模擬計(jì)算崔靜思我，沒有學(xué)過英語，關(guān)鍵也怕學(xué)，所以化工模擬的軟件就用不了，做簡單的、整套低溫甲醇洗工藝設(shè)計(jì)，不會(huì)模擬軟件也應(yīng)該能大概的計(jì)算出來。當(dāng)然，期間遇到太多、太大的難度，前后計(jì)算中稍作變動(dòng)，必須重復(fù)計(jì)算，反復(fù)迭代。其中低溫甲醇洗二氧化碳吸收塔的模擬計(jì)算困擾了很久，但是可以做出來的。 這里只想把自己的思路分享與你。1.工藝氣參數(shù)：壓力5.43mpa，溫度-35C，氫氣60%，一氧化碳28%，二氧化碳12%凈化氣目標(biāo)參數(shù)：二氧化碳12%(不問怎么沒有硫，硫已經(jīng)在脫硫塔脫除。)要求：用盡量少的甲醇(甲醇99.7%，水0.3%)。2.選定參數(shù)：出塔甲醇含二氧化碳20%3.如圖:圖

2、13.1設(shè)定吸收塔段數(shù)吸收塔分段目的：補(bǔ)充吸收過程所需冷量。吸收塔設(shè)置為三段3.2設(shè)定每段吸收量，假定為三分之一3.3溫度溫度決定了甲醇對(duì)二氧化碳吸收的效果，且有如下關(guān)系物料02、05間關(guān)系XCO2=K1*P*Y/PCO2 物料01、05間關(guān)系XCO2=K2*P*Y/PCO2 、關(guān)系式中的PCO2是該溫度下二氧化碳的飽和壓力、Y是氣體中二氧化碳的含量(m/m)，K1不等于K2且K2小于K1，一般公式中K取0.425，吸收過程中K2、K1的一般經(jīng)濟(jì)取值在0.350.40間，兩者間差距小表明塔盤吸收效果差，但XCO2就越大，段間塔盤數(shù)就應(yīng)該越多，所需甲醇循環(huán)量就越少；反之XCO2就越小，段間塔盤數(shù)

3、就應(yīng)該越少，所需甲醇循環(huán)量就越多。出塔甲醇含二氧化碳20%(設(shè)計(jì)目標(biāo)值)時(shí)，出塔甲醇經(jīng)濟(jì)溫度應(yīng)該為-35度。K1=201.20385.4312=0.3695=經(jīng)過計(jì)算，吸收塔分三段，熱力學(xué)計(jì)算上不容易通過，改為四段。(如圖2 )圖2 熱力學(xué)參數(shù)：二氧化碳吸收放熱：16945KJ/Kmol甲醇、富甲醇比熱：2.232.306KJ/KG計(jì)算結(jié)果：16#物料入塔工藝氣 物料號(hào)16物料敘述工藝氣流量 kmol/h13624.17636流量 NM3/h(G)305369.564流量 kg/h196423.4351壓力 Mpa(A)5.44溫度 ()-52焓變 KJ/h%(mol)Kmol/hkg/hH2

4、2.01659.574573788116.54499616361.98N228.010.29828780840.639256991138.447CO28.0128.078927683825.522625107153.3Ar39.95073196334708.3565CH416.040.10458462314.2487935228.5857CO2(G)44.0111.813475391609.48872170832.79H2S34.0800COS60.7500CH3OH32.0400H2O18.0200CO2(L)44.010合計(jì)10013624/p>

5、.417#物料過程氣物料號(hào)17物料敘述工藝氣流量 kmol/h13253.7641流量 NM3/h(G)297067.2179流量 kg/h180108.5578壓力 Mpa(A)5.42溫度 ()焓變 KJ/h%(mol)Kmol/hkg/hH22.01661.229809498115.25451116359.38N228.010.30650832240.62388991138.017CO28.0128.847881643823.430181107094.7Ar39.95072111214707.923CH416.040.10736935714.2304812522

6、8.2919CO2(G)44.019.3107815271234.0290254309H2S34.0800COS60.7500CH3OH32.040.06388.455901498270.9428H2O18.020.00014340.0190058980.342397CO2(L)44.010合計(jì)10013253.7641180108.618#物料過程氣物料號(hào)18物料敘述工藝氣流量 kmol/h13063.78309流量 NM3/h(G)292809.0214流量 kg/h171832.8051壓力 Mpa(A)5.4溫度 ()焓變 KJ/h%(mol)Kmol/hkg/hH22.01662.1

7520716357.9N228.010.31089887540.615154691137.772CO28.0129.258301743822.241075107061.4Ar39.95071494618707.6767CH416.040.10885121614.2200867228.1252CO2(G)44.018.0291177611048.90652846161.85H2S34.0800COS60.7500CH3OH32.040.04255.552107812177.8999H2O18.020.00009560.0124889770.224

8、992CO2(L)44.010合計(jì)10013063.78309171832.819#物料過程氣物料號(hào)19物料敘述工藝氣流量 kmol/h12720.3793流量 NM3/h(G)285112.0375流量 kg/h156820.0687壓力 Mpa(A)5.38溫度 ()焓變 KJ/h%(mol)Kmol/hkg/hH22.01663.781440898113.24120416355.32N228.010.31917231340.59992891137.345CO28.0130.031879353820.168964107003.3Ar39.9507042026707

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合計(jì)10012720.3793156820.120#物料凈化氣物料號(hào)20物料敘述凈化氣流量 kmol/h12232.36811流量 NM3/h(G)274173.8524流量 kg/h137467.7117壓力 Mpa(A)5.

10、38溫度 ()焓變 KJ/h%(mol)Kmol/hkg/hH22.01666.07629048082.69507716293.74N228.010.32895011640.238389051127.217CO28.0130.829428063771.169128105630.8Ar39.95045054852697.1145CH416.040.11266607613.78172914221.0928CO2(G)44.012.5305.809202813458.51H2S34.0800COS60.7500CH3OH32.040.011.22323681139.1947

11、8H2O18.020.000006550.000801220.014434CO2(L)44.010合計(jì)10012232.36811137467.7250#物料貧甲醇物料號(hào)250物料敘述貧甲醇流量 kmol/h4757.012266流量 NM3/h(G)106622.7215流量 kg/h152223.3472壓力 Mpa(A)5.38溫度 ()-52焓變 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合計(jì)1004757.012266152223.3251#物料富甲醇物料號(hào)251物料敘述富甲醇流量 kmol/h5240.5103流量 NM3/h(G)117459.7498流量 kg/h171431.2366壓力 Mpa(A)5.4K0.342溫度 ()-31.5P0CO21.336560189焓變 KJ/h%(mol)Kmol/hkg/h亨利系數(shù)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吸收熱6848163 H2S34.0800甲醇冷量-6980734 COS60.7500CH3OH32.0490.478173324741.517992151927.1H2O18.020.27230622114.27023558257.0823CO

14、2(L)44.010合計(jì)1005240.5103171431.2252#物料富甲醇物料號(hào)252物料敘述富甲醇流量 kmol/h5240.5103流量 NM3/h(G)117459.7498流量 kg/h171431.2366壓力 Mpa(A)5.4溫度 ()-51焓變 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合計(jì)1005240.5103171431.2253#物料富甲醇物料號(hào)253物料敘述富甲醇流量 kmol/h5585.772955流量 NM3/h(G)125198.3979流量 kg/h186503.4761壓力 M

16、pa(A)5.42K0.35溫度 ()-36.4P0CO21.140688893焓變 KJ/h%(mol)Kmol/hkg/h亨利系數(shù)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吸收熱5743621 H2S34.0800甲醇冷量-5771678 COS60.7500CH3OH32.0484.937605314744.421786152020.1H2O18.020.2555913514.2767525257.1997CO2(L)44.010合計(jì)1005585.772955186503.5254#物料富甲醇物料號(hào)254物料敘述富甲醇流量 kmol/h5585.772955流量 NM3/h(G)125198.3979流量 kg/h186503.4761壓力 Mpa(A)5.42溫度 ()-45焓變 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合計(jì)1005585.772955186503.5255#物料富甲醇物料號(hào)255物料敘述富甲醇流量 kmol/h5775.75397流量 NM3/h(G)129456.5943流量 kg/h194779.2288壓力 Mpa(A)5.42溫度 ()-37P0CO21.130435462焓變 KJ/h%(mol)Kmol/hkg/h亨利系數(shù)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吸收熱3136901 H2S34.08000甲醇冷量-3386903 COS60.75000CH3OH32.0482.194040894747.32558152113.1H2O18.020.24729705414.28326942257.3171CO2(L)44.010合計(jì)1005775.

21、75397194779.2256#物料富甲醇物料號(hào)256物料敘述富甲醇流量 kmol/h流量 NM3/h(G)0流量 kg/h194779.2288壓力 Mpa(A)5.42溫度 ()-52焓變 KJ/h%(mol)Kmol/hkg/hH22.0160.56976220332.5594338265.63591N228.010.0067450940.38550085510.79922CO28.010.91432192952.261053631463.837Ar39.950.0047334120.27056361710.80848CH416.040.0078477510.4487521117.199088CO2(G)44.0113.30339295928.219816940850.49H2S34.0800COS60.7500CH3OH32.0484.937605314747.32558152113.1H2O18.020.255591