变压吸附提氢过程数值模拟研究

Numerical simulation study of PSA-H2 extraction process

关键词:  变压吸附  流程模拟  非等温模型  浓度场 

Key words:  pressure swing adsorption  process simulation  non-isothermal model  concentration field

摘要:

采用非等温模型模拟研究了五床三组分变压吸附提氢过程。研究结论表明,当产品氢纯度为99.999%(y)时,计算条件的氢气收率为81%(y),与工业装置的运行结果吻合。从吸附开始到吸附过程结束,各种气体浓度锋面所围成的图形接近一个“橄榄”形。从吸附结束到顺放结束的顺向降压过程,吸附床下部的杂质开始解吸,各气体的浓度锋面曲线逐渐发散。在整个循环过程中,吸附床出口的氢气摩尔分数一直保持在99.98%以上。 

Abstract:

Five-bed three-component PSA-H₂ extraction process was studied by non-isothermal model. The results showed that the recovery rate of hydrogen was 81% when the hydrogen purity was equal to 99.999%. The concentration front of every component formed an “olive” shape from the start to the finish of adsorption. The impurities at the bottom of the adsorbent bed started desorption and the concentration fronts gradually diverged from adsorption finish to PP finish. The hydrogen molar fraction at adsorbent bed outlet was always above 99.98% in the cycle.