溶剂法浓缩煤层气新工艺的模拟研究

A Novel Process Simulation Study of Coalbed Methane Enrichment by Solvent

提出一种以丙醚为吸收剂采用物理吸收的方式浓缩煤层气的新工艺,通过Aspen Plus v7.3从理论上对工艺的合理性进行了分析。工艺模拟选用PSRK物性方法,并逐一考察吸收塔塔板数、操作压力与温度及吸收液用量对煤层气富集效果的影响,并通过分析不同CH/N进料比例的富集效果,确定了最优进料比。模拟结果表明:进料CH和N的物质的量比3∶7时,则经该工艺浓缩后,甲烷产品气浓度为67.44%,甲烷回收率为87.11%,且当进料甲烷浓度增加至50%以上时,经该工艺富集后可浓缩至80%以上,符合煤层气民用及工业利用价值。该浓缩工艺可为现有煤层气浓缩方法提供新思路。

In this paper,a type of novel solvent absorption method with propyl ether as absorbent is proposed which the coalbed methane(CBM) was concentrated and simulated with the way of physical absorption.The reasonable process had been designed and analyzed by Aspen Plus v7.3 aimed at its reasonability in theory.Through the PSRK,a property method used to simulate,the number of theoretical stages and the optimum operating pressure, temperature, amount of fresh absorbent add were studied respectively.By analyzing the different enrichment effects of CH/Nfeed ratio,the optimal one could be confirmed.Simulation results show that when the feed molar ratio of CHand Nwas 3 ∶ 7,then after the concentration,the methane concentration of product gas was 67.44%,and the methane recovery rate was 87.11%.When feeding methane concentrations increased to more than50%,it can be enriched to more than 80%,which was confirmed to the CBM civil and industrial utilization value.The enrichment process designed in this paper can provide a new research idea for the enrichment of CBM.