doi:10.16186/j.cnki.1673-9787.2020020061

Received:2020/02/28

Revised:2020/06/15

Published:2021/11/15

Experimental study on the optimal wetting time of coal seam water infusion for gas outburst prevention

XIAO Zhiguo1,2,3, ZHANG Hongbing 4, SHI Qingyuan 1, ZHANG Xiaopeng1

1.School of Safety Science and Engineering， Henan Polytechnic University， Jiaozuo  454000 ， Henan， China;2.Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization， Jiaozuo  454000 ， Henan， China;3.Collaborative Innovation Center of Coal Safety Production of Henan Province， Jiaozuo  454000 ， Henan， China;4.Henan College of Industry & Information Technology， Jiaozuo  454000 ， Henan， China

Abstract:Abstract ：Coal seam water infusion is a technical measure to inject pressure water into coal bodly through bore-holes ， which results in a complex three-phase coupling among coal ，gas and water ， and a reduction of coal dust generation and an effect of coal and gas out burst prevention. However ， there is lack of a reliable method to evaluate the optimal wetting time after coal seam water infusion for a long time. In order to solve this technical problem ， the desorption rate curves of pre-adsorption gas coal samples were tested in different wetting times after water injection. According to the principles that both the capillary function and the imhibitory effect of gas desorption was strongest after coal being fully wetted ， with the first minute gas desorption rate V， and gas de-sorption attenuation coefficient hk， as the research indexes ， the optimal wetting times of Chaohua（CH） ， Guhanshan（ CHS） and Sihe（SH） coal samples were determined ， which were 6.44，7.00 ，10.41 h ， respectively. Finally ， combining the characteristics of coal samples and the contact angle with water， the feasibility of this method of the optimal wetting time was verified ， which was of great guiding significance to the optimization of the technical parameters of coal seam water infusin for gas outburst prevention.

Key words:coal seam water infusion;optimal wetting time;parameter optimization;coal and gas outburst prevention

 煤层注水防突最优润湿时间试验研究_肖知国.pdf