基金项目:国家自然科学基金青年基金(51404195); 陕西省重点科技创新团队计划(2012KCT-09)
通讯作者:于志金(1989-),男,汉,黑龙江双鸭山人,博士研究生,E-mail:yuzhijin0927@126.com
为掌握综放工作面停采回撤期间由于煤氧化升温而产生的温度异常区域的动态演化规律,进而科学地指导防灭火措施的高效应用。以典型工作面为背景,基于煤自燃过程的耦合原理与实验得出的数据参数,利用COMSOL软件对采空区遗煤的氧化升温过程进行了数值模拟。结果 表明:工作面回撤时期,在漏风较为稳定的条件下,煤体持续氧化升温采空区内的高温区域会逐渐形成于靠近漏风源的进、回风两侧距工作面3~10 m范围内,并随着时间推移,温度呈非线性升高的特征。如不采取有效的防治措施,燃烧则会在进风一侧距工作面3~5 m区域内率先发生。通过现场实践,利用模拟得出规律成功地指导了现场工作面的回撤,证明了模拟结果能够正确地反应采空区温度分布的变化趋势。
Grasping the evolutional law of temperature abnormal region due to the self-heating of coal during retreating period of full-mechanized mining face,is a scientific guidance for effective application of fire prevention measures.Taking the typical working face as the background,based on the coupling principle of coal spontaneous combustion and data from experiment,numerical simulation is carried out by COMSOL software.The results show that during retreating period of face,on the conditions of the stability of air leakage,coal will be oxidized with the temperature rising constantly.High temperature zone will be formed gradually on both sides of air intake and return where close to air leakage source and 3~10 m from the face in mining-out area,and with time goes,temperature rises constantly.If not to take effective measures to control,burning will first happy in the side of air intake from working face 3~5 m.The conclusions have been drawn from simulated results to guide the mining face retreat successfully,and the simulated results are validated it,which can correctly reflect the variation tendency of temperature distribution in mining-out area.