Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (8): 1870-1878.doi: 10.1016/j.cjche.2018.11.022

• Process Systems Engineering and Process Safety • Previous Articles     Next Articles

Modelling and simulation of two-bed PSA process for separating H2 from methane steam reforming

Huiru Li1, Zuwei Liao2, Jingyuan Sun1, Binbo Jiang1, Jingdai Wang2, Yongrong Yang2   

  1. 1 Zhejiang Provincial Key Laboratory of Advanced Chemical Engineering Manufacture Technology, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China;
    2 State Key Laboratory of Chemical Engineering, College of Chemical and Biological Engineering, Zhejiang University, Hangzhou 310027, China
  • Received:2018-08-25 Revised:2018-11-19 Online:2019-08-28 Published:2019-11-16
  • Contact: Zuwei Liao
  • Supported by:
    The financial support from the project of National Natural Science Foundation of China (21822809 & 61590925), the National Science Fund for Distinguished Young Scholars (21525627).

Abstract: Methane steam reforming is the main hydrogen production method in the industry. The product of methane steam reforming contains H2, CH4, CO and CO2 and is then purified by pressure swing adsorption (PSA) technology. In this study, a layered two-bed PSA process was designed theoretically to purify H2 from methane steam reforming off gas. The effects of adsorption pressure, adsorption time and purgeto-feed ratio (P/F ratio) on process performance were investigated to design a PSA process with more than 99.95% purity and 80% recovery. Since the feed composition of the PSA process changes with the upstream process, the effect of the feed composition on the process performance was discussed as well. The result showed that the increase of CH4 concentration, which was the weakest adsorbate, would have a negative impact on product purity.

Key words: Hydrogen, Adsorption, Purity, Recovery, Feed composition