真空变压吸附分离氮气甲烷模拟与实验研究

采用椰壳活性炭为吸附剂，进行了三床真空变压吸附（VPSA）氮气甲烷分离过程的研究。在吸附和置换压力为0.5 MPa，解吸压力为-0.08 MPa条件下，将体积分数（下同）为30%的甲烷，浓缩至80%～98%，甲烷的回收率达到65%～96%，并研究了吸附和置换步骤下塔顶出口流量对于产品气纯度和收率的影响。运用Aspen Adsorption软件建立上述模型，模拟结果与实验结果基本一致；模拟可以为甲烷富集的工业装置建立提供基本设计参数。

Modeling and Experiment of Vacuum Pressure Swing Adsorption Process for N2 and CH4 Separation

The three bed vacuum pressure swing adsorption experiment for nitrogen and methane separation was studied with the coconut shell activated carbons as adsorbent.The adsorption and replacement pressure was 0.5 MPa,and the desorption pressure was-0.08 MPa.30% Methane was concentrated to 80—98% with the recovery of 65%—96%.The influence of outlet flow rate in the adsorption and replacement steps for the purity and recovery of methane were also studied.Aspen Adsorption software was used to establish the model,the simulation results and the experimental results were approximately the same.Simulation process was able to provide the basic design parameters of the industrial plants for methane enrichment.