摘要
煤炭的氧化自燃,必须同时具备如下条件:①煤层具有自燃倾向性且呈破碎状态堆积;②连续的通风供氧条件;③持续的蓄热环境;④足够的氧化时间。无论采用留煤柱开采还是无煤柱开采,其工作面后方的采空区都存在漏风,其漏风的范围不仅受顶板岩性、顶板冒落方式的影响,而且受工作面推进速度和采空区冒落岩石压实时间的影响。漏风流速的大小直接影响煤炭的供氧与蓄热条件,氧气浓度的大小决定煤层的氧化自燃能力,而工作面的推进速度决定了浮煤氧化的持续时间,因而对于有自燃倾向性煤层的采空区完全具备了自燃的条件。
The oxidation and spontaneous combustion of coal must meet the following conditions simultaneously:①The coal seam has a tendency towards spontaneous combustion and accumulates in a fragmented state;②Continuous ventilation and oxygen supply conditions;③Continuous thermal storage environment;④sufficient oxidation time.Whether using coal pillar mining or no coal pillar mining,there is always air leakage in the goaf behind the working face.The range of air leakage is not only affected by the lithology of the roof and the method of roof caving,but also by the speed of the working face and the compaction time of the caving rocks in the goaf.The magnitude of air leakage velocity directly affects the oxygen supply and heat storage conditions of coal.The concentration of oxygen determines the oxidation and spontaneous combustion ability of coal seams,while the advancing speed of the working face determines the duration of floating coal oxidation.Therefore,goaf areas with spontaneous combustion tendency fully have the conditions for spontaneous combustion.
作者
骈立超
Pian Lichao(Shanxi Lu'an Group and Shunyi Yuan Coal Industry Co.,Ltd.,Jinzhong 032700)
出处
《石化技术》
CAS
2024年第10期67-69,共3页
Petrochemical Industry Technology
关键词
自燃“三带”
氧化带
负压
COMSOL软件
Spontaneous combustion three zones
Oxidation zone
Negative pressure
COMSOL software
