8m大采高综采工作面风流及呼吸尘分布规律数值模拟  

Numerical Simulation on Distribution Laws of Air and Respirable Dust at Fully Mechanized Face with 8 m Mining Height

作　　者：许圣东 李德文 陈芳 XU Shengdong;LI Dewen;CHEN Fang(China Cod Research Institute,Beijing 100013,China;China Coal Technology and Engineering Group Chongqing Research Institute,Chongqing 400037,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《煤矿安全》2018年第12期160-163,168,共5页Safety in Coal Mines

基　　金：国家重点研发计划资助项目(2017YFC0805201)

摘　　要：针对大采高综采工作面风流及粉尘分布规律不清的问题,基于标准k-ε湍流模型和离散相模型,采用gambit软件建立了8 m大采高综采面顺、逆风割煤时的几何模型,并采用fluent软件模拟出在1.2 m/s的入口风速下巷道中风速及呼吸尘浓度分布情况。结果表明:采煤机正上方2～3 m范围形成了风速大于2 m/s的高风速区,高风速区在采煤机下风侧发生偏移,且高风速区在逆风割煤时比顺风割煤时约长30 m。采煤机机身上方1～2 m范围形成了浓度大于250mg/m3的高浓度呼吸尘区,横向扩散导致人行道3～5 m高度内呼吸尘浓度较大,且顺风割煤时影响区域更大。在采煤机下风侧呼吸带高度、呼吸尘浓度由煤壁向人行道方向减小,且顺风割煤时对人行道污染更严重。移架时产生的呼吸尘主要集中在顶部空间运移,且不易沉降。In order to find out air and respirable dust distribution laws of fully mechanized mining face with large mining height,based on standard k-ε turbulence and disperse phase models, a geometric model of fully mechanized mining face with 8 m mining height is built by gambit software. Air velocity and respirable dust concentration distribution were simulated at 1.2 m/s of inlet air velocity by fluent software. The results showed that a high air velocity area beyond 2 m/s was formed among 2 to 3 m above the shearer, which appeared horizontal migration downwind the shearer. And the high wind speed area is about 30 m longer than that of downwind coal cutting. A high respirable dust concentration area beyond 250 mg/m3 was formed among 1 to 2 m above the shearer. The respirable dust concentration at the height of 3 to 5 m was high in sidewalk due to horizontal diffusion of dust, and the affected area was larger when cutting coal downwind. In the downwind of the shearer, respirable dust concentration at the height of breathing zone declined from coal wall to sidewalk, which caused more pollution to sidewalk when cutting coal downwind. And the respirable dust generated from moving support mainly migrated around the roof, which was hard to settle.

关 键 词：大采高综采 风速分布 呼吸尘 粉尘分布规律 数值模拟 粉尘防治 

分 类 号：TD713[矿业工程—矿井通风与安全]