8m大采高综采工作面风流及呼吸尘分布规律数值模拟
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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.
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.
引文
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[3]杨俊哲.8 m大采高综采工作面关键回采技术研究[J].煤炭科学技术,2017,45(11):9-14.
[4]赵国瑞,亓玉浩,杜毅博,等.8 m以上大采高综采工作面综合防尘关键技术[J].煤炭科学技术,2017,45(11):51-55.
[5]左前明.大采高综采工作面煤尘扩散规律及防治技术研究[D].北京:中国矿业大学(北京),2014.
[6]张广,尚少鹏,武文斐.大采高综采工作面煤尘质量浓度分布特性[J].辽宁工程技术大学学报(自然科学版),2014,33(4):456-460.
[7]牛伟,蒋仲安,刘毅.综采工作面粉尘运动规律数值模拟及应用[J].辽宁工程技术大学学报(自然科学版),2010,29(3):357-360.
[8]汤研,王德明,王和堂.综采工作面粉尘浓度分布研究[J].煤炭技术,2015,34(8):203-205.
[9]谭聪,蒋仲安,陈举师,等.综采割煤粉尘运移影响因素的数值模拟[J].北京科技大学学报,2014,36(6):716-721.
[10]聂百胜,李祥春,杨涛,等.工作面采煤期间PM2.5粉尘的分布规律[J].煤炭学报,2013,38(1):33-37.
[11]时训先,蒋仲安,邓云峰,等.综采工作面粉尘污染状况研究[J].中国安全生产科学技术,2008,4(1):67.
[12]李华炜.煤矿呼吸性粉尘及其综合控制[J].中国安全科学学报,2005,15(7):67-69.