Oxygen distribution in bed and safety analysis during hydrogen purification process from oxygen-containing feed gas  

作　　者：Lingbing Bu Li Guo Yingqi Luo Wenhua Yin Yi Wu Hongyu Zhang 

机构地区：[1]Southwest Institute of Chemical Co.,Ltd.,Chengdu 610225,China

出　　处：《Chinese Journal of Chemical Engineering》2025年第2期24-32,共9页中国化学工程学报(英文版)

基　　金：support provided by the Sichuan Province Science and Technology Achievement Transformation Project(2023ZHCG0063);which was essential for the successful completion of this research。

摘　　要：In order to analysis the oxygen distribution in the adsorption bed during the hydrogen purification process from oxygen-containing feed gas and the safety of device operation, this article established a non-isothermal model for the pressure swing adsorption (PSA) separation process of 4-component (H_(2)/O_(2)/N_(2)/CH_(4)), and adopted a composite adsorption bed of activated carbon and molecular sieve. In this article, the oxygen distribution in the adsorption bed under different feed gas oxygen contents, different adsorption pressures, and different product hydrogen purity was studied for both vacuuming process and purging process. The study shows that during the process from the end of adsorption to the end of providing purging, the peak value of oxygen concentration in the adsorption bed gradually increases, with the highest value exceeding 30 times the oxygen content of the feed gas. Moreover, the concentration multiplier of oxygen in the adsorption bed increases with the increase of the adsorption pressure, decreases with the increase of the oxygen content in the feed gas, and increases with the decrease of the hydrogen product purity. When the oxygen content in the feed gas reaches 0.3% (vol), the peak value of oxygen concentration in the adsorption bed exceeds 10% (vol), which will make the front part of the oxygen concentration peak fall in an explosion limit range. As the decrease of product hydrogen content, the oxygen concentration peak in the adsorption bed will gradually move forward to the adsorption bed outlet, and even penetrate through the adsorption bed. And during the process of the oxygen concentration peak moving forward, the oxygen will enter the pipeline at the outlet of the adsorption bed, which will make the pipeline space of high-speed gas flow into an explosion range, bringing great risk to the device. The preferred option for safe operation of PSA for hydrogen purification from oxygen-containing feed gas is to deoxygenate the feed gas. When deoxygenation is not available, a lower adsor

关 键 词：Pressure swing adsorption HYDROGEN Numerical simulation Safety analysis 

分 类 号：TQ116.2[化学工程—无机化工]