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采用常压吸附真空解吸的方法对体积分数为12%的低浓度抽排瓦斯开展富集研究.理论分析了吸附塔升压方式和解吸步骤对分离效果的影响,并对原料气充压、排放气充压及抽排3个工艺流程开展了对比实验研究.结果表明:三塔VSA流程可有效地将低浓度煤矿瓦斯富集,在吸附压力为110kPa、解吸压力为10kPa的情况下,可将12%的瓦斯气体富集到26.7%以上;排放气充压流程可以有效地延长气体的穿透时间,在排放气浓度相同的情况下可提高吸附剂的利用效率,提高产品气浓度;抽排工艺流程可以显著地提高产品气浓度,在实验条件不变的情况下抽排步骤由0s增大到6s时产品气体积分数提高了18.7%.
Adopting the method of atmospheric desorption and vacuum desorption, the enrichment study was carried out on the low concentration exhaust gas with a volume fraction of 12% .The theoretical analysis of the effect of the step-up mode and the desorption step of the adsorption tower on the separation efficiency was carried out, Gas charging and pumping three comparative experiments were carried out.The results show that the three-tower VSA process can effectively enrich the gas in low concentration coal mine, under the condition of adsorption pressure of 110kPa and desorption pressure of 10kPa, 12% of the methane gas is enriched to 26.7% or more; the process of charging pressurized gas can effectively extend the gas breakthrough time, and can increase the utilization efficiency of the adsorbent and increase the product gas concentration under the same emission gas concentration; The process can significantly improve the product gas concentration, product gas volume fraction increased by 18.7% when the pumping step increased from 0s to 6s under the same experimental conditions.