摘要
为了解决高瓦斯突出煤层综采工作面生产期间粉尘污染严重的问题,利用工作面回风巷现有的瓦斯抽采孔开展了煤层注水减尘实践。根据试验测量和统计分析,对注水过程中钻孔的注水量、注水流量和注水压力随注水时间变化情况进行了分析研究、并对注水前后煤体水分增量及注水降尘后的降尘效果进行了考察。研究表明:高瓦斯突出煤层综采面在实施瓦斯抽采后,利用瓦斯抽采钻孔进行动静压结合注水减尘,工艺可操作性强,可大幅减少煤层注水钻孔的施工量;注水后工作面煤体的水分增量达到了1%以上,司机位置原始总粉尘质量浓度由1 335.5 mg/m3降至681.1 mg/m3,呼吸性粉尘由358.6 mg/m3降至167.1 mg/m3,降尘效率分别为49.0%和53.4%;采煤机下风侧15 m处总粉尘浓度由原始的1 108.9 mg/m3降至526.8 mg/m3,呼吸性粉尘浓度从303.9 mg/m3降至145.8 mg/m3,降尘效率分别为52.5%和52.0%。
In order to solve the serious dust pollution problem occurred in the production period of the fully-mechanized coal mining face in a high gas outburst seam,the available gas drainage boreholes in the air returned gateway of the coal mining face were applied to make the dust control practices with the water injection in the seam. Based on the experiment measurement and statistic analysis,an analysis study was conducted on the variation conditions of the borehole water injection volume,the water injection flow and the water injection pressure in the water injection process. An investigation was conducted on the water content increased before and after the water injection and the dust effect after the water injection and dust control. The study showed that after the gas drainage practiced in the fully-mechanized coal mining face in the high gas and outburst seam,the gas drainage boreholes were applied to the dynamic and static pressure combined water injection and dust control. The gas drainage borehole technology had a strong operability and could highly reduce the construction work load of the seam water injection borehole. After the water injection completed,the water content of the coal in the coal mining face could be increased by over 1%,the original total dust mass concentration at the driver location was reduced from 1 335.5 mg/m3 to681.1 mg/m3,the respirable dust mass concentration was reduced from 358.6 mg/m3 to 167.1 mg/m3 and the dust control efficiency was49.0% and 53.4% individually. The total dust density at the downside with a distance of 15 m of the coal shearer was reduced from the original 1 108.9 mg/m3 to 526.8 mg/m3,the respirable dust mass concentration was reduced from 303.9 mg/m3 to 145.8 mg/m3 and the dust control efficiency was 52.5% and 52.0% individually.
作者
张小涛
ZHANG Xiaotao(Chongqing Research Institute, China Coal Technology and Engineering Group, Chongqing 400037, China;School of Resources and Environmental Science, Chongqing University, Chongqing 400044, China)
出处
《煤炭科学技术》
CAS
CSCD
北大核心
2019年第1期231-236,共6页
Coal Science and Technology
基金
国家重点研发计划资助项目(2017YFC0805200)
关键词
粉尘
瓦斯抽采
煤层注水
降尘效率
dust
gas drainage
water injection in seam
dust control efficiency
