随着煤炭采深和强度的增加,多数矿井原有的1套抽采系统不能满足采掘平衡及安全生产需求,且由于采用原有系统进行高低负压(预抽、采空区抽采)抽采,导致高、低浓度瓦斯混合,不利于瓦斯的利用。鉴于此,以余吾煤矿为研究对象,将该矿现有西回风井1套地面固定瓦斯抽采系统进行优化,将其服务范围由全矿井缩小到只负责南一、南二采区的瓦斯抽采,扩建新抽采系统,采用2套管路分别建立高、低负压瓦斯抽采系统,实现全矿井高、低浓度瓦斯分源抽采,分区治理瓦斯。结果表明,该措施有效提高了瓦斯抽采率和瓦斯利用率,使高浓度瓦斯并网输送,低浓度瓦斯发电利用;同时有效解决了高瓦斯低透气性煤层采掘工作面瓦斯超限与瓦斯突出问题。

With the coal mining depth and intensity increased, previous one set gas drainage system in major mines could not meet the mining and excavation and the mine safety production requirements.And the previous system with the high and low negative pressure gas drainage (pre-drainage and goaf drainage) would cause t he high and low content gas mixed and would not be favorable to the gas utilization.Based on the circumstances, taking Yuwu Mine as a study object, an optimization w as conducted on the available one set gas drainage system of the West Ventilation Shaft fixed at the surface ground.The service scope of the gas drainage system was reduced and was only responsible for the gas drainages in South No.1 and South No.2 Mining Blocks.A new gas drainage system was established and the two pipelines were applied to build high and low negative pressure gas drainage systems individually and to realize the separated source drainage of the high and low content gas in the whole mine and the gas control of each block. The results showed that the technical measures could effectively improve the gas drainage rate and improve the gas u tlliation rate.The high content gas could be put in the pipeline network and the low content gas could be utlized for the power generation.Meanwhile, the gas content 0 ver limit and gas outburst problems occurred in the mine excavation and mining face in high gas and low permeability seam were effectively solved.