摘要
用有限元数值模拟方法,对综放沿采空区侧巷道周围煤体内的漏风流态、氧气消耗及温度升高进行了研究,联立求解了流场中的漏风渗流方程、氧浓度渗流-扩散-消耗方程和传热方程.重点描述了沿空煤柱内的自燃特征和升温过程,得到自然发火期与煤耗氧速度呈反比例关系,而对漏风强度影响不大;漏风强度增大只能使煤体内高温区范围扩大,相对提高自然发火几率.
Finite element based numerical simulation method is adopted to study the air leakage state, oxygen consumption and temperature rise caused by spontaneous combustion in coal body around working roadways along one side of comprehensive mechanized caving mining goaf, and the seepage equation of air leakage, seepage flow-diffusion-consumption equation and heat transfer equation are combined and solved. The spontaneous combustion characters and temperature rise process in pillars of adjacent goafs are discussed emphatically, and we can conclude that there is a inversely-proportional relationship between spontaneous combustion period and oxygen consumption speed of coal while air leakage intensity has little influence on spontaneous combustion period. The range of high temperature zone in coal body will expand with the increment of intensity of air leakage, and the probability will also be higher relatively.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2004年第1期61-65,共5页
Journal of China Coal Society
关键词
煤柱
自然发火
漏风渗流
温度分布
有限元
pillar
spontaneous combustion
seepage flow of air leakage
temperature distribution
finite element
