Control of spontaneous combustion of coal in goaf at high geotemperatureby injecting liquid carbon dioxide: inertand cooling characteristics of coal

International Conference on Energy Engineering and Environmental Protection 2017

能源学;生态环境科学

Liu, Zhenling^1,2 ; Wen, Hu^1 ; Yu, Zhijin^1 ; Wang, Chao^1 ; Ma, Li^1

Key Laboratory of Western Mine Exploitation and Hazard Prevention of Ministry of Education, School of Safety Science and Engineering, Xi'An University of Science and Technology, Xi'an

710054, China^1

Yanzhou Coal Mining Company Limited, Zoucheng, Shandong

272100, China^2

关键词: Apparent activation energy;    Concentration fields;    Cooling characteristics;    Liquid carbon dioxide;    Preexponential factor;    Spontaneous combustion of coals;    Three dimensional geometry;    Variation characteristics;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/121/2/022013/pdf
DOI  :  10.1088/1755-1315/121/2/022013

学科分类：环境科学（综合）

来源: IOP

【 摘 要 】

The spontaneous combustion of coal in goaf at high geo temperatures is threatening safety production in coalmine. The TG-DSC is employed to study the variation of mass and energy at 4 atmospheres (mixed gases of N2, O2and CO2) and heating rates (10°C/min) during oxidation of coal samples. The apparent activation energy and pre-exponential factor of coal oxidation decrease rapidly with increasing theCO2concentration. Furthermore, its reaction rate is slow, its heat released reduces. Based on the conditions of 1301 face in the Longgucoalmine, a three-dimensional geometry model is developed to simulate the distributions stream field and temperature field and the variation characteristics ofCO2concentration field after injecting liquidCO2. The results indicate that oxygen reached to depths of∼120m in goaf, 100m in the side of inlet air, and 10m in the side of outlet air before injecting liquidCO2. After injecting liquidCO2for 28.8min, the width of oxidation and heat accumulation zone is shortened by 20m, and the distance is 80m in the side of working face and 40∼60m in goafin the direction of dip affected by temperature.