Comprehensive dust reduction technology of coal mine belt transport tunnel
In order to solve the problem of dust pollution during coal mine transportation and transfer,taking the main in-clined shaft and main transportation roadway of Caojiatan coal mine as the research background,based on the dust pro-duction law and main dust sources of the roadway,and on the basis of the traditional spray dust prevention measures,the comprehensive dust reduction technology of"Transportation belt closed spray dust reduction+transportation belt ground rapid cleaning+roadway section airflow dust reduction"was optimized.Through theoretical analysis and field test,the a-mount of spray water and spray spacing for belt sealing were determined,and belt cleaning devices such as belt cleaning,belt spray washing,and belt rotating brush were developed,the reasonable spacing of spray in roadway section was ana-lyzed.The results show that when the water volume of the closed belt spray is 20 L/min and the spray spacing is slightly greater than 800 m,combined with the belt cleaning device,the dust production during the belt transportation can be sig-nificantly reduced from the source;when the distance between adjacent air flow purification water curtains in the tunnel section is 900 m,the dispersed dust in the tunnel can be effectively purified through a wet dust collection net,and then the water mist in the tunnel can be treated using a corrugated plate defogging device to ensure good visibility.Through the on-site application,dust of the main inclined shaft and main transportation roadway in Caojiatan coal mine was re-duced below 8 mg/m3,the technology had a good effect on dust control,it can provide reference for measures establishing of dust control in similar conditions.
transport transferspray dust suppressionair flow purificationtechnical equipment
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