基于轻组分充压的改进型三塔真空变压吸附工艺富集煤矿乏风瓦斯的实验研究

建立了以活性炭为吸附剂的三塔真空变压吸附实验装置，对循环过程中的充压方式和抽真空排放过程进行了实验研究.采用轻组分从吸附塔上端充压可以在排放气甲烷体积分数相同的情况下，延长穿透时间，提高产品气甲烷体积分数；而在循环中引入抽真空排放步骤也可以在不改变吸附与解吸压力的情况下有效提高产品气中甲烷的体积分数.在此基础上，对同时包含排放气充压步骤和抽排步骤的三塔变压吸附循环流程进行了实验研究.实验结果表明，应用该循环可以在吸附和解吸压力分别为140 kPa和20 kPa条件下将甲烷体积分数为0.2%的乏风瓦斯富集至0.654%，同时甲烷回收率在65%.

Experimental study on the improved VPSA process of pressurization with raffinate for VAM upgrading

An improved pressurization step with raffinate and vacuum exhaust step were developed and experimentally studied in a three-bed vacuum pressure-swing adsorption (VPSA) system with activated carbon for ventilation air methane (VAM) upgrading. It is found that pressurization with raffinate from the effluent end can prolong the penetration time and increase the CH₄ concentration in product gas in the case of the same raffinate concentration;but the vacuum exhaust step can increase the CH₄ concentration in product gas without increasing pressure. A three-bed VPSA cycle which contains the two steps was also studied experimentally. The results show that the CH₄ concentration in product gas can increase from 0.4% to 0.654% with the CH₄ recovery of 65% when the CH₄ concentration in feed is 0.2% and the adsorption and desorption pressures are 140 kPa and 20 kPa, respectively.