中国石油大学（北京）本科毕业设计第I页天然气混合制冷液化流程模拟摘要混合制冷剂天然气液化工艺是目前应用最广泛的液化工艺。本文在分析天然气液化装置中常用的混合制冷剂液化循环的几种基本工艺的基础上，根据天然气和混合制冷剂热物性的特点，选择了PR（Peng-Robinson）方程来计算这两种混合物的相平衡特性。利用HYSYS软件研究了混合制冷剂流程的冷箱制冷部分，建立了冷箱模拟计算模型，研究了混合制冷剂组分对液化过程的影响。关键词:混合制冷液化循环；流程模拟；HYSYS；冷箱中国石油大学（北京）本科毕业设计第II页SimulationofMixedRefrigerantCycleforNaturalGasLiquefactionAbstractTheMixed-RefrigerantCycle(MRC)isthemostwidelyusedliquefactionprocessnowadays.SeveralMRCcyclesforLiquefiedNaturalGas(LNG)productionwereanalyzedinthispaper,--Basedonthethermodynamicpropertiesofnaturalgasandmixed-refrigerant,thePeng-Robinson(PR)equationwasselectedtocalculatethephaseequilibrium.ThecoldboxintheliquefactioncyclewassimulatedbyusedHYSYSsoftware,themodelwasestablishedandthecomponentsofthemixedrefrigerantinfluenceonliquefactionprocesswerestudied.Keywords:MRC;simulation;HYSYS;coldbox中国石油大学（北京）本科毕业设计第III页目录第1章前言..................................................................................................11.1工业背景和研究意义.........................................................................11.1.1世界液化天然气工业的发展...................................................21.1.2中国液化天然气工业的发展...................................................21.2国内外研究现状.................................................................................41.3研究内容.............................................................................................5第2章混合制冷液化流程............................................................................62.1混合制冷液化流程.............................................................................62.2混合制冷剂液化流程的分类.............................................................62.2.1闭式混合制冷剂液化流程.......................................................62.2.2开式混合制冷剂液化流程.......................................................82.2.3丙烷预冷混合制冷剂液化流程...............................................92.2.4CII液化流程...........................................................................122.2.5新型两级混合制冷剂液化流程.............................................14第3章冷箱..................................................................................................163.1冷箱简介...........................................................................................163.2冷箱的技术关键...............................................................................163.2液化天然气领域冷箱的应用...........................................................16第4章天然气液化流程模拟软件..............................................................194.1HYSYS简介.....................................................................................194.2HYSYS中各个模块的性质与原理.................................................204.2.1气液分离器.............................................................................204.2.2壳管式换热器.........................................................................214.2.3LNG换热器............................................................................244.2.4阀门...................
