适合于低浓度煤层气的低温液化精馏浓缩的工艺流程模拟与分析  

Simulation and Analysis of Low-temperature Liquefaction and Distillation Process of Low-concentration CBM

作　　者：季中敏[1] 范庆虎[1] 刘晓东[1] 

机构地区：[1]哈尔滨工业大学低温与超导技术研究所,哈尔滨150080

出　　处：《煤炭技术》2010年第6期11-13,共3页Coal Technology

摘　　要：针对大陆矿煤层气气源条件,提出了一种低浓度煤层气低温液化精馏分离的工艺流程。该方法中的液化系统采用混合制冷剂液化工艺,低温部分采用低温精馏的方法从LNG中分离氮氧,运用大型化工流程软件对液化系统进行了模拟计算与比较分析,分析了煤层气中O2含量的变化及精馏塔的再沸比的变化对LNG的组分的影响,以及再沸比的变化对再沸器热负荷的影响。According to the characteristics of conditions in the Dalu mine gas source,the paper presents a cryogenic liquefaction and distillation separation process which is suitable for low concentration CBM containing plentiful nitrogen and oxygen.The liquefaction unit adopts highefficiency mixed refrigerant liquefaction cycle.The low-temperature part adopts the distillation tower to remove the nitrogen and oxygen from LNG.The low concentration CBM liquefaction system is simulated and analyzed using large-scale numerical analysis software.It analyzes the influence of O2 mole fraction in CBM,and the molar boil-up ratio on LNG components,such as CH4 and O2.It also analyzes the influence of the molar boil-up ratio on the distillation tower duty.

关 键 词：低浓度 煤层气 液化技术 模拟 精馏 

分 类 号：TD712[矿业工程—矿井通风与安全]