7-能量平衡计算书

四川维尼纶厂15万吨/年醋酸乙烯酯联产20万吨/年醋酸生产项目能量平衡计算书10目 录1 概述12 能量衡算原理33 能量衡算任务44 能量衡算表54.1 EDA合成工段54.1.1浆态床反应器（R0101）54.1.2精馏塔（T0101）54.2.1精馏塔（T0201）64.2.2裂解反应器（R0201）74.2.3精馏塔（T0202）74.3 VAC精制工段84.3.1精馏塔（T0301）84.3.2 精馏塔（T0302）94.3.3 精馏塔（T0303）95总结101 概述本项目是为中国石油化工股份有限公司维尼龙分厂新建一个年产15万吨醋酸乙烯酯的分厂，位于重庆市长寿区长寿经济技术开发区内。原料是来自总厂的合成气以及另分厂的醋酸甲酯，经过EDA合成工段、EDA裂解工段、醋酸乙烯酯精制工段，来生产高纯度醋酸乙烯酯。设计过程中利用Aspen Plus对全流程进行模拟，并在此基础上完成能量衡算，Aspen plus全模拟流程如下图所示。 图1-1EDA合成工段Aspen模拟流程图图1-2EDA裂解工段Aspen模拟流程图 图1-3 VAC精制工段Aspen模拟流程图2 能量衡算原理进行热量衡算书的编制，其中一个主要依据是能量平衡方程：输入系统的能量=输出系统的能量+系统积累的能量对于连续系统，有： Q+W=Hout-Hin其中：Q 设备的热负荷；W 输入系统的机械能；Hout 离开设备的各能量焓之和；Hin进入设备的各能量焓之和。在进行全厂热量衡算时，是以单元设备为基本单位，考虑由机械能转换、化学反应释放和单纯的物理变化带来的热量变化。最终对全工艺段进行系统级的热量平衡计算，进而用于指导节能降耗设计工作。3 能量衡算任务在进行本项目装置的热量衡算中，主要通过定量计算完成下述基本任务： （1）确定工艺单元中物料输送机械（如泵）所需要的功率，以便于进行设备的设计和选型； （2）确定吸收等单元操作中所需要的热量或冷量以及传递速率，计算换热设备的尺寸，确定加热剂和冷却剂的消耗量，为后续设计中比如供汽、供冷、供水等专业提供设备条件； （3）确定为保持一定反应温度所需移除或者加入的热传递速率，指导反应器的设计和选型；（4）提高热量内部集成度，充分利用余热，提高能量利用率，降低能耗； （5）最终计算出总需求能量和能量的费用，并由此确定工艺过程在经济上的可行性。4 能量衡算表4.1 EDA合成工段4.1.1浆态床反应器（R0101）表4-1 浆态床反应器能量衡算表项目单位InOut流股编号010701080109PhaseLiquid PhaseVapor PhaseLiquid PhaseTemperature34.5180.0000174.0000Pressurebar034.500034.5000Molar Vapor Fraction11.00000.0491Molar Liquid Fraction00.00000.9509Molar Solid Fraction34.50.00000.0000Mole Flowskmol/hr500.0489749.9614534.7984Mass Flowskg/hr37042.156014508.979651551.1356Volume Flowcum/hr54.5465833.977086.0462Molar Enthalpycal/mol-100479.1785-16514.9305-141944.3125Mass Enthalpycal/gm-1356.4141-853.6480-1472.5495Molar Entropycal/mol-K-78.760411.3678-94.7146Mass Entropycal/gm-K-1.06320.5876-0.9826Enthalpy Flowcal/sec-13956806.8231-3440433.5842-21086554.8522表4-2 浆态床反应器能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error-3646527.760-17397240.41-21086554.85220.0114.1.2精馏塔（T0101）表4-3精馏塔能量衡算表项目单位InOut流股编号0118011901200121PhaseLiquid PhaseVapor PhaseLiquid PhaseLiquid PhaseTemperature21.833520.122920.1229157.4904Pressurebar2.00002.00002.00002.0019Molar Vapor Fraction0.01281.00000.00000.0000Molar Liquid Fraction0.98720.00001.00001.0000Molar Solid Fraction0.00000.00000.00000.0000Mole Flowskmol/hr506.96427.814519.1320480.0177Mass Flowskg/hr51116.8292221.91211416.100549478.8166Volume Flowcum/hr125.462195.06681.510752.9473Molar Enthalpycal/mol-156381.1755-29740.1791-106259.0205-153955.0911Mass Enthalpycal/gm-1550.9501-1047.2799-1435.5960-1493.5920Molar Entropycal/mol-K-119.93926.8664-94.3310-105.4054Mass Entropycal/gm-K-1.18950.2418-1.2744-1.0226Enthalpy Flowcal/sec-22022125.1846-64556.6895-564707.8586-20528101.0435表4-4精馏塔能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error01222287-22022125.1846-21,157,365.591604.2 EDA裂解工段4.2.1精馏塔（T0201）表4-5 精馏塔能量衡算表项目单位Inout流股编号020102020203PhaseLiquid PhaseLiquid PhaseLiquid PhaseTemperature157.4963 144.9772 197.2792 Pressurebar2.2000 2.2000 2.2066 Molar Vapor Fraction0.0000 0.0000 0.0000 Molar Liquid Fraction1.0000 1.0000 1.0000 Molar Solid Fraction0.0000 0.0000 0.0000 Mole Flowskmol/hr480.0227 235.6557 244.3670 Mass Flowskg/hr49478.9908 14170.0567 35308.9341 Volume Flowcum/hr52.9482 15.6668 40.9943 Molar Enthalpycal/mol-153953.4704 -110681.7990 -193623.5582 Mass Enthalpycal/gm-1493.5868 -1840.6983 -1340.0351 Molar Entropycal/mol-K-105.4051 -64.5922 -142.8039 Mass Entropycal/gm-K-1.0226 -1.0742 -0.9883 Enthalpy Flowcal/sec-20528101.9782 -7245222.1462 -13143114.2445 表4-6 精馏塔能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error03,863,210.08-20528101.9782-20,388,336.39070.0124.2.2裂解反应器（R0201）表4-7裂解反应器能量衡算表项目单位Inout流股编号02060207PhaseVapor PhaseVapor PhaseTemperature171.9485141.0000Pressurebar1.00001.0000Molar Vapor Fraction1.00001.0000Molar Liquid Fraction0.00000.0000Molar Solid Fraction0.00000.0000Mole Flowskmol/hr1234.11781469.3181Mass Flowskg/hr138914.5225138914.5225Volume Flowcum/hr44438.019349229.4797Molar Enthalpycal/mol-145861.0763-120617.1729Mass Enthalpycal/gm-1295.8310-1275.7845Molar Entropycal/mol-K-80.2883-64.1329Mass Entropycal/gm-K-0.7133-0.6783Enthalpy Flowcal/sec-50002708.2499-49229163.9742表4-8裂解反应器能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error0514582.687-50002708.2499-49229163.9742-0.054.2.3精馏塔（T0202）表4-9 精馏塔能量衡算表项目单位Inout流股编号020802090210PhaseVapor PhaseVapor PhaseLiquid PhaseTemperature141.0000130.8372168.2300Pressurebar1.00001.00001.0038Molar Vapor Fraction1.00001.00000.0000Molar Liquid Fraction0.00000.00001.0000Molar Solid Fraction0.00000.00000.0000Mole Flowskmol/hr1469.31811411.286258.0319Mass Flowskg/hr138914.5225130433.56778480.9548Volume Flowcum/hr49229.479746055.95219.4075Molar Enthalpycal/mol-120617.1729-118122.6667-197833.6308Mass Enthalpycal/gm-1275.7845-1278.0827-1353.6992Molar Entropycal/mol-K-64.1329-62.5377-150.0224Mass Entropycal/gm-K-0.6783-0.6767-1.0265Enthalpy Flowcal/sec-49229163.9742-46306912.3844-3189072.6076表4-10 精馏塔能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error00-49229163.9742 -49229163.974204.3 VAC精制工段4.3.1精馏塔（T0301）表4-11 精馏塔塔能量衡算表项目单位Inout流股编号030103020304PhaseLiquid PhaseVapor PhaseLiquid PhaseTemperature80.0000 69.5256 133.6676 Pressurebar1.0000 1.0000 1.0024 Molar Vapor Fraction0.0000 1.0000 0.0000 Molar Liquid Fraction1.0000 0.0000 1.0000 Molar Solid Fraction0.0000 0.0000 0.0000 Mole Flowskmol/hr1411.2862 234.9901 1176.2961 Mass Flowskg/hr130433.5677 19240.8104 111192.7573 Volume Flowcum/hr132.2676 6493.1980 118.1246 Molar Enthalpycal/mol-129549.0432 -67968.5573 -138036.3667 Mass Enthalpycal/gm-1401.7156 -830.1072 -1460.2717 Molar Entropycal/mol-K-91.5840 -62.0117 -88.0291 Mass Entropycal/gm-K-0.9909 -0.7574 -0.9312 Enthalpy Flowcal/sec-50786325.4520 -4436648.8780 -45103232.9210 表4-12 精馏塔塔能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error00-50786325.4520-50786325.452004.3.2 精馏塔（T0302）表4-13精馏塔能量衡算表项目单位Inout流股编号030503100315PhaseLiquid PhaseVapor PhaseLiquid PhaseTemperature35.0000 10.2962 72.2978 Pressurebar1.1000 1.0001 1.0020 Molar Vapor Fraction0.0000 1.0000 0.0000 Molar Liquid Fraction1.0000 0.0000 1.0000 Molar Solid Fraction0.0000 0.0000 0.0000 Mole Flowskmol/hr234.9901 23.4637 211.5263 Mass Flowskg/hr19240.8104 1033.7004 18207.1097 Volume Flowcum/hr21.1860 541.3618 21.0983 Molar Enthalpycal/mol-76686.0078 -12769.4251 -81727.7757 Mass Enthalpycal/gm-936.5744 -289.8503 -949.4959 Molar Entropycal/mol-K-87.8623 -32.1732 -88.1667 Mass Entropycal/gm-K-1.0731 -0.7303 -1.0243 Enthalpy Flowcal/sec-5005680.6242 -83227.3190 -4802104.6774 表4-14精馏塔能量衡算表W（cal/sec）Q（cal/sec）Hin（cal/sec）Hout（cal/sec）Error10,131,709.8762-5005680.6242-4,885,331.99644.01642E-074.3.3 精馏塔（T0303）表4-15精馏塔能量衡算表项目单位Inout流股编号031703180320PhaseLiquid PhaseLiquid PhaseLiquid PhaseTemperature60.0000 118.6979 139