附录2-物料衡算

扬子石化年产15万吨醋酸乙烯酯生产装置项目太行之巅2019“东华科技-恒逸石化杯”第十三届全国大学生化工设计竞赛扬子石化年产15万吨醋酸乙烯酯生产装置项目团队成员：王励卓沈坤杰王腾乐侯世欣宋 川指导教师：王艳红李同川郭 婧赵慧鹏马忠平物料衡算目录1 物料衡算11.1 概述11.2 物料衡算目的11.3 物料衡算方法11.4 总项目衡算21.4.1 物料衡算任务21.4.2 醋酸乙烯酯合成工段31.4.3 醋酸回收工段71.4.4 原料气回收工段111.4.5 醋酸乙烯酯精制工段151.4.6 总物料衡算191.5 总结2531 物料衡算1.1 概述本项目以醋酸、乙烯、富氧为原料通过Leap法生产纯度为99.93%醋酸乙烯酯，年产量17.6万吨，副产乙醛水溶液和精制CO2。Leap法采用流化床工艺，解决了固定床温度不均，温度难以控制的问题，而且选择性高，处理量大，特别适用本次年产15万吨醋酸乙烯酯项目。从投资费用，原料消耗，原子利用率，能耗高低，三废排放，本质安全，流程繁简等方面考虑后，最终选择Leap法进行醋酸乙烯酯的生产。设计过程中利用Aspen Plus对全流程进行模拟，并在此基础上完成物料衡算，Aspen Plus模拟流程如图1-1所示：图1-1 全流程模拟图本流程主要分为四个工段，分别是醋酸乙烯酯合成工段、醋酸回收工段、原料气回收工段、醋酸乙烯酯精制工段。本场所需主要设备有反应器、气液分离器、吸收塔、精馏塔、泵、压缩机、换热器、蒸发器等，涉及到的原料有乙烯、醋酸和氧气等，输入整个系统的能量主要有电能、加热介质带入的能量等，输出的能量主要有冷却剂带走的能量和输出物料的焓。1.2 物料衡算目的工艺设计中，物料衡算是在工艺流程确定后进行的。目的是根据原料与产品之间的定量转化关系，计算原料的消耗量，各种中间产品、产品和副产品的产量，生产过程中各阶段的消耗量以及组成，进而为热量衡算、其他工艺计算及设备计算打下基础。对于已有装置，物料衡算可以弄清原料的来龙去脉，找出生产中的薄弱环节，为改进生产、完善管理提供可靠的依据和明确方向，并可作为检查原料利用率及三废处理完善程度的一种手段。1.3 物料衡算方法物料衡算是根据质量守恒定律，利用某进出化工过程中某些已知物流的流量和组成，通过建立有关物料的平衡式和约束式，求出其他未知物流的流量和组成的过程。系统中物料衡算一般表达式为：系统中的积累=输入-输出+生产-消耗式中，生成或消耗项是由于化学反应而生成或消耗的量；积累量可以是正值，也可以是负值，当系统中积累量不为零时称为非稳定状态过程；积累量为零时，称为稳定状态过程。稳定状态过程时，可以简化为：输入=输出-生成+消耗对无化学反应的稳定过程，又可表示为：输入=输出物料衡算包括总质量衡算、组分衡算和元素衡算。各种衡算方法的适用情况如表1-1所示：表1-1 各衡算方法适用情况类别物料衡算形式无化学反应有化学反应总衡算式总物流衡算式适用适用总物质的量衡算式适用不适用组分衡算式组分质量衡算式适用不适用组分物质的量衡算式适用不适用元素原子衡算式元素原子质量衡算式适用适用原始原子物质的量衡算式适用适用由于系统中存在化学反应，我们主要采用总质量衡算的衡算方法，同时列出每种物料组分的质量流量便于查找和计算。1.4 总项目衡算本项目的工艺路线可分为如下4个工段：醋酸乙烯酯合成工段、醋酸回收工段、原料气回收工段、醋酸乙烯酯精制工段。1.4.1 物料衡算任务对于本厂，工艺采取年开工8000小时的连续操作。物料衡算的主要任务在于：（1）确定乙酸乙烯酯以及副产品的实际产量以及质量指标；（2）确定醋酸、原料气、乙酸正丁酯、混合胺的循环量及损失率等指标；（3）确定工艺中的“三废”排放量等公共经济指标；（4）汇总全流程物料衡算，数据用于完成物料流程图等后续设计任务。1.4.2 醋酸乙烯酯合成工段醋酸乙烯酯合成工段模拟示意如图1-2所示：图1-2 醋酸乙烯酯合成工段扬子石化年产15万吨醋酸乙烯酯生产装置项目表1-2 反应工段总物流衡算表项目单位进口物料出口物料原料乙烯精制醋酸回收气1回收气2回收气3富氧膜分离废气粗醋酸乙烯酯01010102010801090110011901130116相态VaporLiquidVaporVaporVaporVaporVaporMixed温度15117.081630.07288305308.48837494.98827压力bar20144910410质量流量kg/hr7941.40218715.9113.162333.48376799.146260.2921209.084108969C2H4kg/hr7941.4021.73E-44112.8274238.35354889.060312.264255614.36O2kg/hr01.69E-967.35E-050.0197215230.795422.55259.13585230.867HAckg/hr018658.732.65E-147.07E-050.013752002126.546N2kg/hr01.64E-1013.38E-050.0310716527.25837.7403837.684316527.37VAMkg/hr01.04E-240.0116395.192822107.89260022214.81H2Okg/hr057.172282.22E-070.90695940.8376005405.495CO2kg/hr05.51E-740.16185987.503041.09E-05001753.014METHY-01kg/hr04.89E-211.58E-060.0006070.00851001.964817ETHYLkg/hr04.68E-171.07E-070.0011680.014777004.42126ACETA-01kg/hr01.96E-320.1609070.0867322.5728820088.03763MDEAkg/hr06.08E-06004.33E-07006.16E-06MEAkg/hr00.001464000.000104000.001485HCO3-kg/hr00000000MEACOO-kg/hr00000000MDEA+kg/hr00000000MEA+kg/hr00000000续表1-2CO32-kg/hr00000000H3O+kg/hr00000000OH-kg/hr00000000NBAkg/hr09.55E-075.28E-131.3878850.690565002.07823质量分率C2H419.27E-490.9970440.7147380.71470900.2582650.510369O209.01E-1016.50E-075.91E-050.068110.8661820.048910.048003HAc00.9969452.34E-162.12E-071.79E-07000.019515N208.74E-1062.98E-079.32E-050.2152010.1338180.6928250.15167VAM05.57E-290.0001030.0155710.001405000.203864H2O00.0030551.96E-090.002720.000532000.049606CO202.94E-780.001430.2623911.42E-10000.016087METHY-0102.61E-251.39E-081.82E-061.11E-07001.80E-05ETHYL02.50E-219.44E-103.50E-061.92E-07004.06E-05ACETA-0101.05E-360.0014220.000263.35E-05000.000808MDEA03.25E-10005.64E-12005.66E-11MEA07.82E-08001.36E-09001.36E-08HCO3-00000000MEACOO-00000000MDEA+00000000MEA+00000000CO2-300000000H3O+00000000续表1-2OH-00000000NBA05.10E-114.66E-150.0041628.99E-06001.91E-05体积流量cum/hr295.848619.7967524.8395965.47286972.827499.316249.40919745.8656扬子石化年产15万吨醋酸乙烯酯生产装置项目1.4.3 醋酸回收工段醋酸回收工段模拟示意如图1-3所示：图1-3 醋酸回收工段7扬子石化年产15万吨醋酸乙烯酯生产装置项目表1-3 醋酸回收工段总物流衡算表项目单位进口物料出口物料粗醋酸乙烯酯原料醋酸乙酸正丁酯精制醋酸醋酸水洗塔塔顶气倾析器气体倾析器油相倾析器水相共沸废液011602010229010202130224022502260235相态MixedLiquidLiquidLiquidVaporVaporLiquidLiquidLiquid温度94.988272020117.08169.409532-5-5-577.26639压力bar1011119991质量流量kg/hr10896916563.7325.5517618715.972951.614299.48324798.12907.09123886.208C2H4kg/hr55614.360.00E+0001.73E-4448980.364184.6112431.5240.00524417.86032O2kg/hr5230.8670.00E+000.00E+001.69E-965222.8037.5882380.4676162.56E-050.008145HAckg/hr2126.54616538.890.00E+001.87E+040.3228340.0013554.4565086.09E-052.086503N2kg/hr16527.370.00E+000.00E+001.64E-10116512.3914.550310.4200051.06E-060.014079VAMkg/hr22214.810.00E+0001.04E-240.33383552.4189422160.733.14E-061.395927H2Okg/hr5405.49524.84560.00E+0057.17228542.65591.14422978.43377907.08493843.779CO2kg/hr1753.0140.00E+0005.51E-741.69E+0337.2464629.216280.0007670.083198METHY-01kg/hr1.9648170.00E+000.00E+004.89E-210.0021230.0090961.9446455.19E-080.008956ETHYLkg/hr4.421260.00E+000.00E+004.68E-170.0125720.0081814.3474513.25E-100.053055ACETA-01kg/hr88.037630.00E+0001.96E-321.3110431.90509984.808850.0001350.012507MDEAkg/hr6.16E-060.00E+0006.08E-060.00E+00000.00E+000MEAkg/hr0.001485000.0014642.09E-270000HCO3-kg/hr000000000MEACOO-kg/hr000000000MDEA+kg/hr000000000续表1-3MEA+kg/hr000000000CO3-2kg/hr000000000H3O+kg/hr000000000OH-kg/hr000000000NBAkg/hr2.078230.00E+002.56E+019.55E-074.9541490.0003311.7707174.50E-1520.90685质量分率C2H40.510369009.27E-490.6714090.9732820.0980535.78E-060.004596O20.0480030.00E+0009.01E-1010.0715930.0017651.89E-052.82E-082.10E-06HAc0.0195159.99E-010.00E+009.97E-014.43E-063.15E-070.000186.72E-080.000537N20.1516700.00E+008.74E-1062.26E-010.0033841.69E-051.17E-093.62E-06VAM0.2038640.00E+000.00E+005.57E-294.58E-060.0121920.8936463.46E-090.000359H2O0.0496061.50E-0300.0030550.0074390.0002660.0031630.9999930.989082CO20.01608700.00E+002.94E-780.0231180.0086630.0011788.46E-072.14E-05METHY-011.80E-050.00E+0002.61E-252.91E-082.12E-067.84E-055.72E-112.30E-06ETHYL4.06E-050.00E+000.00E+002.50E-211.72E-071.90E-060.0001753.58E-131.37E-05ACETA-010.0008080.00E+000.00E+001.05E-361.80E-050.0004430.003421.49E-073.22E-06MDEA5.66E-110.00E+0003.25E-100.00E+000000MEA1.36E-080.00E+0007.82E-082.87E-32000.00E+000HCO3-00.00E+00000.00E+00000.00E+000MEACOO-000000000MDEA+000000000MEA+000000000CO3-2000000000续表1-3H3O+000000000OH-000000000NBA1.91E-050.00E+001.00E+005.10E-116.79E-057.69E-087.14E-054.96E-180.00538体积流量cum/hr9745.86515.363630.02900719.7967560039.44344.348228.707930.8871784.14500510扬子石化年产15万吨醋酸乙烯酯生产装置项目1.4.4 原料气回收工段原料气回收工段模拟示意如图1-4所示：图1-4 原料气回收工段11扬子石化年产15万吨醋酸乙烯酯生产装置项目表1-4 原料气回收工段总物流衡算表项目单位进口物料出口物料醋酸水洗塔塔顶气倾析器气体乙醛水洗塔塔顶气混合胺吸收塔废液解析塔废液99%CO2回收气2回收气3021302240406030103120325032601090110相态MixedLiquidLiquidLiquidVaporVaporLiquidLiquidLiquid温度9.409532-5-25.9022205530305压力bar191199449质量流量kg/hr72951.614299.4832405.476862.76541572.554139.90381674.26333.48376799.14C2H4kg/hr48980.364.18E+032306.4150.00E+00321.963310.3079611.7026238.35354889.06O2kg/hr5222.8037.59E+004.68E-010.00E+000.0481651.00E-0601.97E-025230.79HAckg/hr0.3228340.0013551.40E-070.00E+000.2779030.0326107.07E-050.013752N2kg/hr16512.391.46E+014.20E-010.00E+000.0745857.80E-0703.11E-0216527.25VAMkg/hr0.3338355.24E+0167.985460.00E+007.0692690.58352605.19E+00107.8926H2Okg/hr542.65591.1442291.13E+00860.69491239.645124.23400.90695940.8376CO2kg/hr1686.4683.72E+0129.053460.00E+003.31E-092.6996861662.55887.503041.09E-05METHY-01kg/hr0.0021239.10E-031.23E-060.00E+000.0017380.00036406.07E-040.00851ETHYLkg/hr0.0125728.18E-031.54E-070.00E+000.0039570.00085201.17E-030.014777ACETA-01kg/hr1.3110431.91E+000.0004560.00E+000.4930080.06397600.0867322.572882MDEAkg/hr0.00E+000.00E+0001.02E-011.02E-011.20E-0700.00E+004.33E-07MEAkg/hr2.09E-27001.8950761.88E+007.13E-16000.000104HCO3-kg/hr00000.00050.003035000MEACOO-kg/hr00000.0012052.27E-17000MDEA+kg/hr000000000续表1-4MEA+kg/hr0000.0578530.0729523.73E-09000CO3-2kg/hr00000.0055572.16E-10000H3O+kg/hr0001.10E-105.75E-110.000946000OH-kg/hr0000.0158470.0164961.12E-11000NBAkg/hr4.9541493.31E-046.44E-100.00E+000.8992021.97683401.39E+000.690565质量分率C2H40.6714090.9732820.9588190.00E+000.2047390.0736790.006997.15E-010.714709O20.0715931.76E-030.0001940.00E+003.06E-057.18E-090.00E+005.91E-056.81E-02HAc4.43E-063.15E-075.82E-110.00E+001.77E-042.33E-0402.12E-071.79E-07N20.2263470.0033841.75E-040.00E+004.74E-055.58E-090.00E+009.32E-052.15E-01VAM4.58E-061.22E-022.83E-020.00E+004.50E-030.00417101.56E-020.001405H2O0.0074392.66E-040.0004710.99760.78830.88799600.002720.000532CO20.0231180.0086631.21E-020.00E+002.10E-120.0192970.993012.62E-011.42E-10METHY-012.91E-082.12E-065.10E-100.00E+001.11E-062.60E-060.00E+001.82E-061.11E-07ETHYL1.72E-071.90E-066.40E-110.00E+002.52E-066.09E-0603.50E-061.92E-07ACETA-011.80E-054.43E-041.89E-070.00E+003.14E-040.00045702.60E-043.35E-05MDEA0.00E+000.00E+0001.18E-046.47E-058.59E-10005.64E-12MEA2.87E-320.00E+0002.20E-031.20E-035.10E-1800.00E+001.36E-09HCO3-00.00E+00003.18E-072.17E-0500.00E+000MEACOO-00007.66E-071.62E-19000MDEA+000000000MEA+0006.71E-054.64E-052.67E-11000CO3-200003.53E-061.54E-12000H3O+0001.27E-133.66E-146.76E-06000续表1-4OH-0001.84E-051.05E-057.97E-14000NBA6.79E-057.69E-082.68E-1300.0005720.0141300.0041628.99E-06体积流量cum/hr6.00E+043.44E+021.72E+038.63E-011.80E+001.45E-012.34E+026.55E+016972.82714扬子石化年产15万吨醋酸乙烯酯生产装置项目1.4.5 醋酸乙烯酯精制工段醋酸乙烯酯精制工段模拟示意如图1-5所示：图1-5 醋酸乙烯酯精制工段15扬子石化年产15万吨醋酸乙烯酯生产装置项目表1-5 醋酸乙烯酯精制工段总物流衡算表项目单位进口物料出口物料倾析器油相倾析器水相回收气1乙醛水洗塔塔顶气乙醛精制塔塔釜废液热泵塔废液46%乙醛水溶液膜分离废液醋酸乙烯酯022502260108040604280417042604270420相态LiquidLiquidVaporVaporLiquidMixedLiquidLiquid温度-5-530.07288-25.902299.5103100.55743535115.965压力bar994113.6113.6质量流量kg/hr24798.12907.0912113.1622405.476573.074176.88263170.9975317.211622048.4C2H4kg/hr2431.5245.24E-03112.82742.31E+034.74E-061.34E-0812.2867402.73E-08O2kg/hr0.4676162.56E-057.35E-054.68E-015.53E-420.00E+0009.31E-090HAckg/hr4.4565086.09E-052.65E-141.40E-075.75E-050.0038503.18E-054.452629N2kg/hr0.4200051.06E-063.38E-054.20E-015.45E-450.00E+0001.90E-090VAMkg/hr22160.733.14E-060.0116396.80E+011.23E-054.42216649.959685.55E+0022032.8H2Okg/hr78.43377907.08492.22E-071.133125572.916472.4029129.67391308.68310.708889CO2kg/hr29.216287.67E-040.1618592.91E+012.20E-25000.0017310.00E+00METHY-01kg/hr1.9446455.19E-081.58E-061.23E-069.02E-060.0035501.79E-021.92316ETHYLkg/hr4.3474513.25E-101.07E-071.54E-071.61E-070.00070204.65E-034.342095ACETA-01kg/hr84.808851.35E-040.1609074.56E-040.1576680.0494579.077172.9530892.410116MDEAkg/hr0.00E+000.00E+0000.00E+000.00E+000.00E+0000.00E+000.00E+00MEAkg/hr0.00E+000000.00E+000.00E+00000HCO3-kg/hr000000000MEACOO-kg/hr000000.00E+00000MDEA+kg/hr000000000续表1-5MEA+000000.00E+00000CO3-2kg/hr000000.00E+00000H3O+kg/hr0000.00E+000.00E+000000OH-kg/hr000000.00E+00000NBAkg/hr1.7707174.50E-155.28E-136.44E-109.07E-122.82E-0604.87E-061.770709质量分率C2H40.0980535.78E-060.9970449.59E-018.26E-091.74E-100.0718530.00E+001.24E-12O21.89E-052.82E-086.50E-071.94E-049.65E-450.00E+000.00E+002.94E-110.00E+00HAc1.80E-046.72E-082.34E-165.82E-111.00E-075.01E-0501.00E-072.02E-04N21.69E-051.17E-092.98E-071.75E-049.50E-480.00E+000.00E+005.99E-120.00E+00VAM8.94E-013.46E-091.03E-042.83E-022.14E-080.0575180.2921661.75E-020.999292H2O0.0031631.00E+001.96E-090.0004710.9997250.9417330.1735340.9731143.22E-05CO20.0011788.46E-071.43E-031.21E-023.84E-28005.46E-060.00E+00METHY-017.84E-055.72E-111.39E-085.10E-101.57E-084.62E-050.00E+005.65E-058.72E-05ETHYL1.75E-043.58E-139.44E-106.40E-112.82E-109.13E-0601.47E-051.97E-04ACETA-013.42E-031.49E-071.42E-031.89E-072.75E-040.0006430.4624469.31E-031.09E-04MDEA0.00E+000.00E+0000.00E+000.00E+000.00E+00000.00E+00MEA0.00E+000.00E+0000.00E+000.00E+000.00E+0000.00E+000.00E+00HCO3-00.00E+00000.00E+000.00E+0000.00E+000MEACOO-00000.00E+000.00E+00000MDEA+000000000MEA+0000.00E+000.00E+000.00E+00000CO3-200000.00E+000.00E+00000续表1-5H3O+0000.00E+000.00E+000.00E+00000OH-0.00E+000.00E+000.00E+00000000.00E+00NBA7.14E-054.96E-184.66E-152.68E-131.58E-143.67E-080.00E+001.54E-088.03E-05体积流量cum/hr28.707930.88717824.839591721.7820.6237710.08435769.578860.3235127.6847218扬子石化年产15万吨醋酸乙烯酯生产装置项目1.4.6 总物料衡算全流程模拟示意如图1-6所示：图1-6 全流程示意图19扬子石化年产15万吨醋酸乙烯酯生产装置项目表1-6 全流程物料衡算表项目单位进口物料出口物料乙烯原料富氧醋酸原料乙酸正丁酯混合胺膜分离废气共沸废液吸收塔废液解析塔废液99%CO2热泵塔废液46%乙醛水溶液膜分离废液醋酸乙烯酯01010119020102290301011302350312032503260417042604270420相态VaporVaporLiquidLiquidLiquidVaporLiquidLiquidLiquidVaporLiquidMixedLiquidLiquid温48837477.266395530100.55743535115.965压力bar2010111419943.6113.6质量流量kg/hr7941.4026260.29216563.7325.55176862.76541209.0843886.2081572.554139.90381674.2676.88263170.9975317.211622048.4C2H4kg/hr7941.4020.00E+0000.00E+000.00E+003.12E+0217.86032321.96331.03E+0111.70261.34E-0812.2867402.73E-08O2kg/hr05.42E+030.00E+000.00E+000.00E+005.91E+010.0081454.82E-021.00E-060009.31E-090HAckg/hr00.00E+001.65E+040.00E+000.00E+0002.0865032.78E-010.0326100.0038503.18E-054.452629N2kg/hr08.38E+020.00E+000.00E+000.00E+008.38E+020.0140797.46E-027.80E-070001.90E-090续表1-6VAMkg/hr000.00E+000001.3959277.0692690.58352604.42216649.959685.55107522032.8H2Okg/hr00.00E+0024.84560.00E+008.61E+0203843.7791239.6451.24E+02072.4029129.67391308.68310.708889CO2kg/hr00.00E+000.00E+000.00E+000.00E+0000.0831983.31E-092.6996861662.558000.0017310METHY-01kg/hr00.00E+000.00E+000.00E+000.00E+0000.0089561.74E-030.00036400.0035500.0179231.92316ETHYLkg/hr00.00E+0000.00E+00000.0530550.0039570.00085200.00070200.0046534.342095ACETA-01