摘要
为改善新桥煤矿综采面难湿润煤层注水效果,基于多孔介质理论建立新桥煤矿综采工作面煤层注水模型,通过Fluent软件对综采工作面注水过程进行模拟研究,得到了不同注水压力下的煤体湿润半径变化规律和煤体中的水流压力分布与速度分布情况,并开展了现场煤层注水应用试验研究。数值模拟结果表明,煤体的湿润半径随着注水压力的增大而增大,注水压力为6 MPa时湿润半径达到了2.39 m,注水压力7 MPa和8 MPa时湿润半径分别为2.45、2.48 m,相比6 MPa注水压力下的湿润半径增量已不是很大;现场试验结果表明,工作面注水压力为6、7、8 MPa时,煤层湿润半径分别为2.34、2.42、2.47 m,现场注水试验结果与数值模拟结果吻合;煤层注水降尘效率测试结果表明,注水过后采煤机逆风割煤和顺风割煤状态下粉尘浓度有大幅度降低,煤层注水过后最佳降尘效率分别达到了60.09%和58.27%,取得了较好的降尘效果。
In order to improve the water injection effect of the difficult to wet coal seam in the fully-mechanized mining face of Xinqiao Coal Mine,the coal seam water injection model of the fully-mechanized mining face of Xinqiao Coal Mine was established based on the porous media theory.The water injection process of the fully-mechanized mining face was simulated by Fluent software,and the change law of the wet half diameter of the coal body under different water injection pressures and the distribution of water pressure and velocity in the coal body were obtained,and the field coal seam water injection application test was carried out.The numerical simulation results show that the wetting radius of coal increases with the increase of water injection pressure.When the water injection pressure is 6 MPa,the wetting radius reaches 2.39 m,and when the water injection pressure is 7 MPa and 8 MPa,the wetting radius is 2.45 m and 2.48 m,respectively.Compared with the wetting radius increment under 6 MPa water injection pressure,the wetting radius increment is not significant.The on-site test results show that when the water injection pressure of the working face is 6,7,and 8 MPa,the wetting radius of the coal seam is 2.34,2.42,and 2.47 m,respectively.The on-site water injection test results are consistent with the numerical simulation results.The test results of coal seam water injection dust reduction efficiency show that after water injection,the dust concentration of the shearer in the state of cutting coal against the wind and cutting coal along the wind is significantly reduced.The optimal dust reduction efficiency after coal seam water injection reaches 60.09%and 58.27%,respectively,achieving good dust reduction effects.
作者
鲁轲
Lu Ke(CCTEG Chongqing Research Institute,Chongqing 400037,China)
出处
《能源与环保》
2024年第1期245-249,258,共6页
CHINA ENERGY AND ENVIRONMENTAL PROTECTION
基金
国家重点研发计划项目(2022YFB4703603)。
关键词
煤层注水
难湿润
湿润半径
多孔介质
数值模拟
coal seam water injecting
difficult to wet
wetting radius
porous media
numerical simulation
