Experimental on Symbiotic Disaster Characteristics of Gas Drainage and Coal
SI Junhong1
ZHANG Jiuling2
CHENG Genyin1
CHU Tingxiang1
Abstract：In order to solve the symbiotic disaster of gas drainage and coal spontaneous combustion in goaf, the characteristics and mechanism of symbiotic disaster of gas drainage and coal spontaneous combustion are studied. Adopting the method of temperature programmed experiment, the influence of air leakage and oxygen supply on coal spontaneous combustion and oxidation is analyzed. Furthermore, the influence rules of gas volume fraction, oxygen gas integral fraction and temperature in goaf under gas extraction conditions are obtained by using the field monitoring experiments of S1 working face. The results show that, with the increasing of temperature and gas flow rate, The concentration of CH4 increases as well as the concentration of O2 decreases gradually. The appearance temperature of CO is 110℃ ~ 300℃, and the desorption amount shows an exponential growth trend when the temperature is higher than 300℃. With the increasing of goaf depth, the concentration of CH4 increases in shallow part and tends to be stable in deep part, the oxygen content decreases from 20.8% to 7.7%.and the temperature increases from 22.3% to 24.3%. Finally, the distribution of "three zones" in goaf is divided. The width of heat dissipation band is 85 m. the oxidation band is 85~210 m. and the asphyxiation band is 210 M. The width of oxidation band increases more than twice that of non-gas extraction goaf. It provides theoretical support for the prevention and control of symbiotic disasters of gas-coal spontaneous combustion.
Keywords：gasspontaneous combustion of coalsymbiotic disasterdistribution of & ‘three zones’
Publication Date：2019-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：5( 1-5 )