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《Journal of China Coal Society》 2009-05
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Distribution characteristic of remaining coal oxygen consumption and spontaneous combustion heating-up in goaf

LI Zong-xiang~1,WU Qiang~2,WANG Zhi-qing~3(1.College of Safety Science and Engineering,Liaoning Technical University,Fuxin 123000,China;2.Department of Safety Engineering and Technology,Heilongjiang Institute of Science and Technology,Harbin 150027,China;3.Changcun Coal Mine,Lu'an Environment and Energy Corporation Ltd.,Changzhi 046032,China)  
Gave the factors such as the heterogeneity of caving and oxygenization,working face impelling degree,and dynamic boundary,etc.,the equations of goaf nonlinear seepage,dispersion of multicomponent gas and temperature were solved simultaneously.Token temperature(numerical solution) was used to represent the degree of spontaneous combustion and local distribution characteristic of spontaneous combustion oxygenization in goaf.Based on the theoretical computation,difference of oxygen consumption at caving levels forms double layer flow,and when serious,the flow will concentrate at the return airway boundary and then result the high oxygen concentration zone.The main dangerous zone of spontaneous combustion was located on the upstream inlet side;the distribution of high temperature zone was the equilibrium result of three processes: oxygen supply from one way air leakage,oxygen consumption of coal spontaneous combustion,impelling backward of working face.At this point,drastic oxygenization heating-up zone was located on the front edge of the high temperature zone,and the high temperature zone consumes oxygen intensively with the working face impelling,the highest temperature zone was generally located on the low distribution zone of oxygen concentration.At normal temperature,the "three zones" division of goaf spontaneous combustion was consistent with the method of token temperature field,just the latter was more detailed and definite.
【Fund】: 国家自然科学基金资助项目(50574038)
【CateGory Index】: TD752.2
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