A new adding method of foaming agent used for foam dust suppression in underground coal mines
来源期刊：中南大学学报(英文版)2015年第8期
论文作者：LU Xin-xiao WANG De-ming ZHU Chao-bing SHEN Wei ZHONG Xiao-xing Xu Chao-hang
文章页码：3116 - 3122
Key words：coal mines; dust suppression; jet; cavitation; absorption amount; outlet pressure
Abstract: To realize a stable addition of foaming agent used for foam technology, a new adding method using the jet cavitation was introduced, and its performance was investigated experimentally under different operating conditions. Experimental results show that the bubble region in the jet device has a constant vapor pressure, which creates a good condition for liquid absorption, while it shrinks with increasing outlet pressure. The liquid absorption amount keeps unchanged when the outlet pressure is lower than a critical value. The critical outlet pressure increases by 40% with decreasing cavitation absorption amount, which is especially suitable for mini-flow quantitative addition of foaming agent used for foam dust suppression. Its effectiveness on suppressing mine dust was evaluated in a heading face of underground coal mines. Field application indicates that the reliable and simple foaming system adopting the new adding method makes a marked dust suppression effect. The working environment of heading face is signi？cantly improved, ensuring the safe tunneling and personal security.
LU Xin-xiao(陆新晓)1, 2, 3, WANG De-ming(王德明)1, 2, 3, ZHU Chao-bing(朱朝炳)1, SHEN Wei(沈威)1, ZHONG Xiao-xing(仲晓星)1, 2, 3, Xu Chao-hang(徐超航)1
(1. School of Safety Engineering, China University of Mining and Technology, Xuzhou 221116, China;
2. State Key Laboratory of Coal Resources and Safe Mining
(China University of Mining and Technology), Xuzhou 221116, China;
3. Key Laboratory of Gas and Fire Control for Coal Mines of Ministry of Education
(China University of Mining and Technology), Xuzhou 221116, China)
Abstract:To realize a stable addition of foaming agent used for foam technology, a new adding method using the jet cavitation was introduced, and its performance was investigated experimentally under different operating conditions. Experimental results show that the bubble region in the jet device has a constant vapor pressure, which creates a good condition for liquid absorption, while it shrinks with increasing outlet pressure. The liquid absorption amount keeps unchanged when the outlet pressure is lower than a critical value. The critical outlet pressure increases by 40% with decreasing cavitation absorption amount, which is especially suitable for mini-flow quantitative addition of foaming agent used for foam dust suppression. Its effectiveness on suppressing mine dust was evaluated in a heading face of underground coal mines. Field application indicates that the reliable and simple foaming system adopting the new adding method makes a marked dust suppression effect. The working environment of heading face is signi？cantly improved, ensuring the safe tunneling and personal security.
Key words:coal mines; dust suppression; jet; cavitation; absorption amount; outlet pressure
