摘要
依据活性炭对各组分吸附选择性差异,提出一种新型真空变压吸附(VPSA)工艺,可以在N2/CH4/CO2的三组分体系中富集CH4,该方法在传统的重组分提浓工序中加入了CH4和CO2产品气置换步骤,适用于对含低浓度CO2的煤层气甲烷富集。利用Aspen Adsorption软件对该过程进行模拟。原料气假设为体积分数9%CH4/6%CO2/85%N2,活性炭吸附剂对N2/CH4/CO2分离因子为1/4.15/10.62。在进料温度为298 K,吸附压力为0.6 MPa,解吸压力为-0.08 MPa条件下,运行稳态后能够将甲烷浓缩到体积分数77.172%,回收率高达97.923%。同时,CH4在轻重尾气中的体积分数分别仅为0.224%和0.673%。
Abstraet：A novel vacuum pressure swing adsorption （VPSA） process is proposed to recovery CH4 from a ternary system （N2/CH4/CO2）,based on their adsorption differences in activated carbon.Comparing with the traditional process of upgrading heavy components,this process develops two new procedures for the replacement of product gas CH4 and CO2.The simulation of the process,in which the composition of the raw gas is assumed to be 9 vol％ CH4/6％ CO2/85％,is fulfilled in Aspen Adsorption.The temperature of the process,adsorption pressure and desorption pressure are 298 K,0.6 MPa and-0.08 MPa,respectively.The separation factor of N2/CH4/CO2 on activated carbons is 1/4.15/ 10.62.The result of the simulation shows that the purity of CH4 in product can reach to 77.172 vol％,while the content of CH4 in light and heavy exhausts is only 0.224 vol％ and 0.673 vol％,respectively.With a recovery of 97.923％ for CH4,this process can be apphed to methane-enrich coal bed methane containing CO2.
出处
《现代化工》
CAS
CSCD
北大核心
2014年第3期147-151,共5页
Modern Chemical Industry
基金
天津市科技支撑项目(2009F3-0005)
