摘要
为了得到大采高综采工作面PM5和PM10的粉尘分布规律,在工作面布置测点分别在顺风和逆风条件下对采煤机滚筒周围和采煤机下风侧沿程的粉尘浓度进行测定。结果表明:顺风割煤时,后滚筒周围PM5和PM10粉尘起始浓度较高,随后逐渐降低趋于稳定,前滚筒浓度起初较低,70~80 s后急剧升高;逆风割煤时,前滚筒起始浓度波动较大,后滚筒比顺风割煤时的浓度升高点早约10 s;顺风时,PM5、PM10及全尘浓度在采煤机下风侧10 m左右达到最高值,然后逐渐降低至40 m左右趋于稳定,PM5占比起始较高,在采煤机下风侧15 m左右降至最低,随后在风流的作用下再次升高,PM10占比整体呈下降趋势;逆风时,粉尘浓度在采煤机下风侧6m左右达到最高,约20 m时趋于稳定;2种条件下,PM5占比都在60%~80%,而PM10占比高达65%~95%。
In order to obtain the dust distribution of PM5 and PM10 in large mining height fully-mechanized face,the dust concentration around the shearer drum and along the downwind side of the shearer are measured under the conditions of the following wind and upwind respectively.The results show that when coal is cut in following wind,the initial concentration of PM5 and PM10 dust around the rear drum is high,then gradually decreases and becomes stable.The concentration of the front drum is low at first,and rises sharply after 70 to 80 s.When coal is cut in upwind,the initial concentration of the front drum fluctuates greatly,and the concentration of the rear drum rises about 10 s earlier than that in following wind.When coal is cut in following wind,the PM5,PM10 and total coal dust concentration reach the highest at the downwind of shearer around 10 m,then gradually reduce and tend to be stable at 40 m.The PM5 proportion is higher at first,and falls to the lowest at about 15 m,then rises again under the effect of wind.The PM10 proportion is on the decline overall.When coal is cut in upwind,the dust concentration reaches the highest at the downwind of shearer 6 m or so,and is stable about 20 m.PM5 accounts for 60%to 80%,while PM10 accounts for 65%to 95%under both conditions.
作者
苏士龙
郝永江
SU Shilong;HAO Yongjiang(Shanxi Huajin Jining Coal Industry Co.,Ltd.,Xiangning 042100,China;Huajin Coking Coal Co.,Ltd.,Lyuliang 033000,China;College of Environment and Safety,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《煤矿安全》
CAS
北大核心
2020年第7期210-214,220,共6页
Safety in Coal Mines
基金
山西省青年基金资助项目(201801D221357)
国家自然科学基金资助项目(51074008)。
关键词
大采高
顺风割煤
逆风割煤
PM5粉尘
PM10粉尘
粉尘分布
large mining height
coal cutting in following wind
coal cutting in upwind
PM5 dust
PM10 dust
dust distribution
