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| Dust migration and settlement law of fully mechanized excavation face and dust reduction technology of segmented water injection in three pressure zones |
| Chen Bao |
| Jinneng Holding Group Yongdingzhuang Coal Industry Co., Ltd., Datong 037003, China |
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Abstract Aiming at the difficult problem of dust control in fully mechanized excavation face of Yongdingzhuang Coal Industry, the Euler-Lagrangian method is used to study the dust deposition and migration law of II1084 air roadway excavation face in the production process by numerical simulation method. According to the field water injection experiment, it is shown that the average increase of coal seam water content is greater than 1.5 % within 1.5 m of the water injection experiment hole, so 1.5 m can be set as the effective wetting radius of water injection. After the comprehensive dust reduction measures of segmented water injection and high-pressure spray in the three-pressure zone of the coal seam, the total dust concentration at 15 m on the return air side of the working face reached 43.2 mg/m3, and the respirable dust concentration reached 8.2 mg/m3.
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