Study on the Cause of Hypoxia in the Corner of Return Air of Shallow Buried Flammable Coal Seam Group Mining Face and the Coordinated Prevention and Control of Coal Spontaneous Combustion
Source abstract
Abstract
Coal is the main energy source in China, and spontaneous combustion of coal is one of the main disasters in coal mines. Fully mechanized caving top coal mining technology is widely used in coal mines. Under the comprehensive action of multiple factors, gas generated by coal oxidation and low oxygen gas in goaf is easy to rush to working face, resulting in lower oxygen concentration in upper corner and exceeding harmful gas concentration. It seriously threatens the health of underground workers and the normal operation of production. If the oxygen concentration in the upper corner is changed, it is bound to cause the change of the oxygen concentration in the goaf and aggravate the threat of spontaneous combustion of coal in the goaf. In order to solve the double threat of low oxygen in upper corner and coal spontaneous combustion in goaf, based on Coulomb model, this paper uses command flow to conduct numerical simulation tests on the failure law of overlying strata, and obtains the influence of mining of the lower 1 coal seam and the lower 5 coal seam on the overlying strata subsidence and surface penetration. Based on the comprehensive consideration of atmospheric pressure, ore pressure activity, external air leakage and other factors, the mixed model of the source and emission of low oxygen gas in goaf was established, and the formation mechanism of low oxygen problem in the corner of return air of working face was defined. The use of pressure air belt to deal with low oxygen in return air corner is proposed creatively. The comprehensive fire prevention measures such as corner plugging, nitrogen injection and grouting are used to inhibit the oxidation of the left coal and the influx of low oxygen gas to the corner in the goaf, so as to achieve the goal of collaborative prevention and control of low oxygen in the corner of return air and coal spontaneous combustion. The research results have important reference significance for the mine with the risk of spontaneous combustion or the problem of low oxygen in the return air corner.
Source: crossref · Quality: baseline
Research context
OpenAlex topics: Geomechanics and Mining Engineering · Rock Mechanics and Modeling · Coal Properties and Utilization
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Safety Engineering, China University of Mining & Technology, Xuzhou 221000, China
China Coal Technology Engineering Group Chongqing Research Institute, Chongqing 400037, China
National Key Laboratory of Gas Disaster Detecting, Preventing and Emergency Controlling, Chongqing 400037, China
Funding
National Natural Science Foundation of China · Key Project of China Coal Technology Engineering Group Chongqing Research Institute
References (20)
Show source-provided references
1. Cause Analysis and Control Technology of Nitrogen Emission in Goaf of Fully Mechanized Mining Face in Daliuta Mine. Taiyuan University of Technology, Taiyuan, China, 2010.
2. Cause analysis and prevention of low oxygen in return air corner of Fully mechanized mining face
3. Xu, X., Zhang, X., and Wen, H. (2000). Coal-oxygen composite process and its exothermic intensity measurement method. J. China Univ. Min. Technol., 31–35. (In Chinese).
4. Cause analysis and treatment measures of abnormal Oxygen concentration in return air corner of 12612 working face in Daliuta Coal Mine
5. Low oxygen prevention and control technology of Fully-mechanized goaf in shallow and deep coal seam with easy spontaneous combustion
6. Cause analysis and prevention technology of hypoxia in working face
7. Zhang, X., and Lei, Z. (2019). Study on the treatment of low oxygen in the corner of Fully mechanized mining face. Shandong Coal Sci. Technol., 118–119.10.1016/j.compscitech.2018.12.020 ↗
8. Analysis on the Influence of Atmospheric Pressure on abnormal oxygen concentration in return air Corner and its prevention technology
9. Conventional and numerical models of blasting gas behaviour in auxiliary ventilation of mining headings10.1016/j.tust.2012.11.003 ↗
10. Cause analysis and prevention measures of low oxygen level in Fully mechanized mining face with shallow deep and close seam group
11. Cause analysis and prevention technology of low oxygen in return air corner of 22613 Working face in Daliuta Coal Mine
12. Study on prevention and control technology of spontaneous combustion in Fully mechanized caving face of “Three soft” coal seam
13. Numerical simulation of CO emission control in goaf by equal-pressure ventilation technology
14. CO management in corner of fully mechanized face with large mining height in near shallow seam
15. Wang, X. Study on CO Migration Law and Control Technology in Super Large Goaf of Fully Mechanized Coal Seam with Easy Spontaneous Combustion. Taiyuan University of Technology, Taiyuan, China, 2013.
16. Wu, Y. Study and Application of CO Generation and Migration in Goaf Under Normal Temperature in Fully Mechanized Mining Face of Shendong Mining Area. Taiyuan University of Technology, Taiyuan, China, 2015.
17. Cause analysis and treatment measures of CO accumulation in corner of fully mechanized mining face
18. Safety Technology and emergency measures of equal-pressure Ventilation in 22307 Working Face of Bulianta Coal Mine
19. Study on treatment of low oxygen in return air corner of Fully mechanized mining face by equalized pressure technology
20. Prevention and control technology of low oxygen in close seam group mining in Shendong Mining area and its application