Abstract:

To analyze the gas desorption characteristics of coal in real time, based on the power function representing gas desorption rate, a new parameter n representing coal gas desorption characteristics was proposed. The monitoring system of gas emission was constructed on the basis of the existing mine safety monitoring and control system, which could real-time calculate the n value, analyze the gas desorption characteristics at the front of the working face, and had a field test in Wolonghu coal mine. The results show that the monitoring system of gas emission could calculate the daily n value of heading face, the new parameter n shows the reversing trend to traditional desorption index K1 or ?h2, the parameter n could represent the coal gas desorption characteristics. By comparing the critical value of K1 corresponding to the the danger of outburst, the critical value of n could be obtained, which could provide the foundation for predicting the outburst hazard of working face.

Key words: gas emission, desorption rate, desorption characteristics, outburst hazard