Analysis and experimental study on improving water injection effect of coal seam with permeable rod

doi:10.16265/j.cnki.issn1003-3033.2020.05.009

Abstract

Abstract: In order to improve water infusion effect and reduce harm of dust to miners and equipment, wetting effect of water infusion by permeating rod was analyzed and tested. A mechanical model of water infusion was established, and motion law of dynamic water-gas contact and formula of wetting radius with time, pressure, and permeate coefficient were deduced by using displacement theory. Then, through comparative test between ordinary water infusion and water infusion by permeating rod, wetting effect of the latter was analyzed. The results show that compared to the wetting radius of ordinary water infusion which is 6-8 m, that of water infusion by permeating rod is more than 20 m, 2 to 3 times of the former. It can greatly increase wetting range of coal, reduce number of boreholes in working face as well as cost of water infusion.

Key words: permeating rod, wetting radius, dynamic surface, coal seam water infusion, pressure of water infusion

CLC Number:

X936

GUO Jingzhong, JIN Longzhe, YANG Zhaoxia, ZHAO Qifeng, JIANG Dafeng. Analysis and experimental study on improving water injection effect of coal seam with permeable rod[J]. China Safety Science Journal, 2020, 30(5): 54-59.

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