Combined emission characteristics and control technology of gob gas in ultra-close seams
It is well known that the upper gob gas will gush to working face together with gob gas in mining seam when the lower seam is mined in ultra-close seams. When the layer thickness between two seams is small, the two gobs will become one after the layer collapse, and then the higher concentration gas in upper closed gob will gush out into working face under the negative pressure, which can cause the overrun of gas. The exiting gas problems of lower mining coal in ultra-close seam were analyzed, and then the combined emission characteristic and the reasons of gas overrun were drawn out. In view of this situation, using constant pressurized ventilation (CPV) of windscreen-fan regulator of joint air-pressure, the fans were equipped in haulage roadway and adjustable windscreens were set up in return roadway. In 1001 face, increasing pressure and reducing air volume were implemented by this method; the airflow vectors circuits of before and after using constant pressurized ventilation were analyzed. The practical results showed that the technology of constant pressurized ventilation solved the gas problem successfully, and got the safe effect in this face.
ultra-close seams gas combined emission constant pressurized ventilation
Zhang Shoubao Zhang Hui Xie Shengrong He Fulian
College of Resources & Safety Engineering, China University of Mining & Technology (Beijing), Beijing 100083, China
国际会议
The First International Symposium on Mine Safety Science and Engineering (首届矿山安全科学与工程学术会议)
北京
英文
1329-1334
2011-10-27（万方平台首次上网日期，不代表论文的发表时间）