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Authors
Affiliations
1 China University of Mining and Technology Beijing, Beijing 100 083, CN
2 Mine Safety Technology Branch of China Coal Research Institute, Beijing, 100 083, CN
3 Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550 081, CN
Source
Journal of Mines, Metals and Fuels, Vol 65, No 9 (2017), Pagination: 473-478
Abstract
Owing to the gas content is an important indicator in coal and gas outburst prevention, we set up a gas adsorption and desorption experimental system with temperature controlling, and draw out a method combining with experimental analysis, theoretical calculation and project inspection to determine the critical value of gas content in coal and gas outburst prediction. This paper takes D6 coal seam in Pingdingshan No.1 coal mine as an example, sets up the powder function equations among the gas content, gas pressure and gas desorption of drill-cuttings (Δh2 ). The gas content minimum is calculated as 5.04m3 /t as the gas pressure and Δh2 reach their critical values respectively, which is lower than the critical value of gas content (5.19m3 /t) determined by Langmuir formula, considering a deformed coal with a thickness of 0.6m exists in D6 coal seam, the critical value of gas content is determined as 5.0 m3 /t finally, and its accuracy is proved well in engineering application.
Keywords
Coal and Gas Outburst, Critical Value of Gas Content, Gas Adsorption-desorption Experiment, Basic Gas Parameters, Deformed Coal.
