中文摘要：

采用分别装载活性炭和NA型吸附剂的复合床层的变压吸附工艺来脱除合成气中微量的CO和CO2,并利用Aspen-Adsim软件对其进行模拟和优化。模拟结果表明,吹扫气量对工艺性能有较大的影响,吹扫气由处在顺放步骤的吸附塔提供,因此在顺放步骤将床层压力降至较低压力,可获得较大的吹扫气量,此时的工艺性能也较优。模拟结果还表明,均压次数对工艺性能也有影响。在相同的顺放压降下,将变压吸附过程中的3次均压变为2次均压,可减少吸附剂用量,吸附剂产率更高,但塔底尾气量要相应增加。

英文摘要：

A layered Pressure Swing Adsorption（PSA） process with activated carbon and NA as adsorbents was developed for the removal of CO and CO2 from ammonia synthesis gas.The simulation results with Aspen-Adsim software show that the pressure difference Δp of the Provide Purge（PP） step determines the purge gas amount that has a great effect on the process performance.With the increase of Δp,the process performance would be improved.Besides,the number of pressure equalization used in one PSA cycle can also affect the process performance.Under the same Δp,when the three pressure equalizations in one cycle are reduced to the two ones,less amount of adsorbent would be used,and thus a higher yield is reached,but much more exhaust gas would be produced respectively.