低浓度煤层气液化精馏塔运行工况分析  

Analysis of the operation condition of the liquefaction distillation column of low concentration coalbed methane

作　　者：肖露[1,2] XIAO Lu(State Key Laboratory of the Gas Disaster Detecting,Preventing and Emergency Controlling,Chongqing 400037,China;CCTEG Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《矿业安全与环保》2022年第1期100-103,108,共5页Mining Safety & Environmental Protection

基　　金：国家科技重大专项(2016ZX05045-006);天地科技股份有限公司科技创新创业资金专项项目(2019-TD-ZD004)。

摘　　要：低浓度煤层气深冷液化装置的精馏塔的运行工况决定着装置的综合能耗和整体经济性。为了有效优化工艺,降低精馏塔操作负荷,结合实验数据及数值模拟方法,研究了原料气甲烷浓度和精馏塔的回流比对精馏塔设计参数和操作负荷的影响。研究结果表明:随着含氧煤层气气源浓度的增大,精馏塔塔顶冷凝器负荷减小,塔底再沸器负荷增大,为了提高甲烷的回收率,应调节冷剂配比,提高制冷量,使塔顶氮氧尾气中的甲烷充分冷凝;提高精馏塔的操作回流比,可以减小精馏塔的塔板数及高度,但是需要提高综合能耗,实际应用中一般取最小回流比的1.2~2.0倍。The operation condition of distillation column in cryogenic liquefaction unit of low concentration coalbed methane determines the comprehensive energy consumption and overall economy of the unit.In order to effectively reduce the operating load of the distillation column and optimize the process,combined with experimental data and numerical simulation,the effects of feed gas methane concentration and reflux ratio on the design parameters and operating load of the distillation column were studied.The results show that:with the increase of the concentration of oxygen-bearing coalbed methane,the load of condenser at the top of distillation column decreases,and the load of reboiler at the bottom of the column increases.In order to improve the recovery rate of methane,the refrigerant ratio should be adjusted to increase the cooling capacity,so that the methane in the nitrogen and oxygen tail gas at the top of the column can be fully condensed;increasing the reflux ratio of the distillation column can reduce plate number and height of distillation column,but the comprehensive energy consumption needs to be improved.In practical application,the operating reflux ratio is generally 1.2 times to 2.0 times of the minimum reflux ratio.

关 键 词：低浓度煤层气 深冷液化 精馏塔 操作负荷 回流比 综合能耗 

分 类 号：TD712.67[矿业工程—矿井通风与安全] TE645[石油与天然气工程—油气加工工程]