煤矿乏风瓦斯富集中试试验研究

针对煤矿乏风瓦斯浓度低,无法有效利用,并大量排放这一现状,对乏风瓦斯的富集开展了研究,建立了首套乏风瓦斯富集中试试验装置。试验装置瓦斯处理量为500 m3/h,采用三塔两级分离工艺,并引入了抽排和排放气充压的流程。研究结果表明,利用自主改性的椰壳活性炭可将甲烷浓度为0.2%的乏风瓦斯气体富集到1.2%以上;抽排流程用于乏风瓦斯富集中试系统可有效提高产品气浓度,如抽排比由0增大到0.224时,产品气中的甲烷浓度增大到了原来的1.89倍;吸附剂热效应对乏风瓦斯富集的影响较小,试验过程中吸附塔内温度波动不超过3℃。

Pilot- scale study of ventilation air methane enrichment

Amount of the coal mine ventilation air methane(VAM) is unable to be made effective use and discharges into the atmosphere for the low concentration of methane.It not only pollutes the environment but also results in a waste of energy resource.In this paper，the VAM was enriched experimentally.The first pilot VAM enrichment equipment with the gas processing capacity of 500 m3/h was built.The plant included two- stage VPSA separation system with three parallel connected adsorbers respectively，where we introduced a new process with the effluent gas pressurization step and vacuum exhaust step.By employing a modified coconut active carbon，the VAM concentration can raise from 0.2% to more than 1.2%.The result shows the vacuum emission process could enrich the concentration of the product significantly，when the vacuum exhaust ratio increase from 0 to 0.224，the methane concentration of the product increases 1.89 times.The adsorption heat has little influence on the temperature of the adsorber，and the temperature variation during the VPSA cycle is no more than 3 ℃.