真空变压吸附提浓煤层气甲烷的均压过程

Pressure equalizing processes in vacuum pressure-swing adsorption for upgrading methane in coal mine gas

采用以活性炭为吸附剂的两床真空变压吸附实验装置,研究了均压过程对煤层气甲烷提浓的影响.结果表明:均压过程可以快速提高吸附塔内压力,提高吸附压力,增大甲烷气体含量;最好的均压方式为既有上均压又有下均压,上均压0.4s、下均压0.2s后,解吸气中甲烷气体的含量达到最大值,此时两吸附塔之间仍有一定压差.分析了从不同均压压力升压到一定吸附压力的能耗情况.均压压力为93.8kPa时比120.4kPa时的能耗降低了31%.

The effect of pressure equalizing processes in vacuum pressure-swing adsorption on concentrating the methane in coal mine gas was studied experimentally.The results show that pressure equalization can increase the pressure of the absorber rapidly,and raise the adsorption pressure and methane content.The optimal pressure equalizing process is equalizing the pressure at both the inlet and outlet ends of the absorber.After pressure equalization at the inlet end for 0.2s and the outlet end for 0.4s,the methane concentration of the desorbed gas reaches maximum.In the meantime there is still a pressure difference between two absorbers.The energy consumption of raising the pressure from different equalizing pressures to a certain adsorption pressure was analyzed.The energy consumption is decreased by 31% when the equalizing pressure increases from 93.8kPa to 120.4kPa.