六塔三组分变压吸附提氢过程温度变化模拟

摘要

在比较了温度对甲烷吸附容量的影响基础上,利用非等温模型模拟了六塔三组分变压吸附提氢过程温度的变化.结果显示:随着压力的周期性变化床层内的温度呈同周期变化,从计算开始到建立稳定的温度场需要20个周期,大于产品氢体积分数达到99.9%所需的时间;在吸附床底部的温度变化幅度是吸附床顶部的温度变化幅度的9倍,且温度变化幅度较大的是0.5m以下区域;温度变化最快的步骤是终充和逆放步骤;在变压步骤中床层温度峰值随着传质区的移动而移动.%On the basis of comparing the influence of temerature on methane adsorption capacity, a simulation of the temperature change of the six-beds and three components PSA-H2 was carried out by using the non-isothermal model. The results show that the temperature in the bed varies with the pressure in the same cycle, and the establishment of a stable temperature field go through 20 cycles, requiring a longer time than that for reaching a product hydrogen purity of 99.9%. The temperature change amplitude at the bottom of the bed is 9 times that at the top, and the temperature change is larger below 0.5m. The temperature changes of FR and D steps are fastest, and the peak temperature mobiles with mass transfer zone at the variable pressure steps in bed.