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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。
A three-bed vacuum pressure swing adsorption (VPSA) nitrogen methane separation process was studied using coconut shell activated carbon as adsorbent. Under the condition of adsorption and displacement pressure of 0.5 MPa and desorption pressure of -0.08 MPa, the volume fraction of 30% methane is concentrated to 80% -98%, the recovery rate of methane is 65% -96% The effects of the outlet flow rate at the top of the column on the purity and yield of the product gas during the adsorption and displacement steps were studied. Aspen Adsorption software was used to establish the above model. The simulation results are basically consistent with the experimental results. Simulation can provide basic design parameters for the establishment of methane-enriched industrial plants.