摘要
联立求解采空区非线性渗流、多组分气体弥散和温度场,用表征温度(数值解)表达自燃程度和氧化区域分布特征,同时考虑垮落层位上氧化的非均匀性、工作面推进度和动态边界等各影响因素.在考虑升温情况下,采空区自燃"三带"划分方法与表征温度场方法具有一致性,温度场方法表达更具体.计算得到,虽然主自燃危险区处在上游进风侧,但因垮落层位的耗氧差异,在回风边界处(上、下双层流汇流)也可能形成局部高氧浓度区.在"定向漏风供氧-煤耗氧-工作面推进"三者综合作用下,激烈氧化升温带位于高温区的前沿,形成趋于平衡的升温分布区;最高升温点处在氧浓度分布低值区.随着高温区的强烈耗氧和工作面推进移动,高氧区与高温区的分离趋势加大.
Gave the factors such as the heterogeneity of caving and oxygenization, working face impelling degree, and dynamic boundary, etc. , the equations of goal nonlinear seepage, dispersion of muhicomponent 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 goal. 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 goal spontaneous combustion was consistent with the method of token temperature field, just the latter was more detailed and deftnite.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2009年第5期667-672,共6页
Journal of China Coal Society
基金
国家自然科学基金资助项目(50574038)
关键词
自燃
采空区
非线性渗流
耗氧双流层
氧分布
表征温度场
spontaneous combustion of goal
nonlinear seepage
double layer flow of oxygen consumption
oxygen distribution
token temperature field
