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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%.
A three-tower vacuum pressure swing adsorption experiment device with activated carbon as adsorbent was established, and the pressure-charging mode and evacuation process during the cycle were studied experimentally.Using light components to charge methane from the top of the adsorption tower, In the case of the same volume fraction, the breakthrough time can be prolonged to increase the volume fraction of methane in the product. The introduction of evacuation step in the circulation can also effectively increase the volume fraction of methane in the product gas without changing the adsorption and desorption pressures. On the basis of this, an experimental study on the three-column pressure swing adsorption recycle process, which includes both the step of venting the gas and the step of extracting the exhaust gas, is carried out.The experimental results show that when the adsorption and desorption pressures are 140 kPa and 20 kPa Under the conditions, the methane concentration of 0.2% is enriched to 0.654%, while the methane recovery is 65%.