真空变压吸附氢气纯化的参数研究

本文首先建立了多孔介质传热传质与吸附模型,模拟了多组分气(N2:CO:CO2:CH4:H2=0.007:0.012:0.23:0.021:0.73和N2:CO:CO2:CH4:H2=0.007:0.012:0.17:0.021:0.79)在AC5-KS活性炭吸附床中的穿透曲线和真空变压吸附循环。将实验数据与模拟值进行对比验证后,分析了压力、进气流率对穿透曲线的影响,并研究了压力、进气流率、循环步数、循环操作时间条件对真空变压吸附氢气纯化的影响。结果发现,增大吸附压力,减小进气流率,减少循环步数和吸附时间,增加冲洗和升压时间都会导致产品氢气纯度上升,氢气产率和回收率下降,并且在一般情况下氢气的纯度变化趋势与氢气产率和回收率变化趋势相反。

Parameter Study on Pressure Swing Adsorption Cycles for Hydrogen Purification

The heat and mass transfer model with porous media adsorption is established,the breakthrough curve and the vacuum pressure swing adsorption cycle for the multicomponent gas(N2:CO:C02:CH4:H2=0.007:0.012:0.23:0.021:0.73 and N2:CO:CO2:CH4:H2=0.007:0.012:0.17:0.021:0.79)in activated carbon AC5-KS adsorption bed are simulated.After comparing the experimental data with the simulated values,the effects of pressure,feed flow rate on breakthrough curves are analyzed.Then the effects of pressure,feed flow rate,number of cycles,and cycle operating time on vacuum pressure swing adsorption for hydrogen purification are analyzed.The results show that increasing adsorption pressure,reducing feed flow rate,decreasing the number of cycle steps and adsorption time,increasing purging and pressing time will lead to the raise of hydrogen purity,and decline of the productivity and the recovery.Besides,in the general,the trend of hydrogen purity is opposite to that of the hydrogen productivity and hydrogen recovery.