采空区遗煤氧化蓄热的“热-化”耦合过程数值模拟研究  

Numerical simulation of “temperature-chemistry” coupling process of oxidation and heat storage of residual coal in goaf

作　　者：杜斌[1,2,3] DU Bin(China Coal Research Institute,Beijing 100013,China;China Coal Technology&Engineering Group Shenyang Research Institute,Fushun 113122,China;State Key Laboratory of Coal Mine Safety Technology,Fushun 113122,China)

机构地区：[1]煤炭科学研究总院,北京100013 [2]中煤科工集团沈阳研究院有限公司,辽宁抚顺113122 [3]煤矿安全技术国家重点实验室,辽宁抚顺113122

出　　处：《煤矿安全》2023年第6期84-89,共6页Safety in Coal Mines

摘　　要：采空区遗煤在满足某些条件的情况下会发生氧化蓄热升温,以煤氧化蓄热过程中的化学反应场和传热场为研究对象,提出了化学反应场与传热场耦合模型,建立了控制方程并借助数值模拟软件对双因素耦合过程进行了模拟;通过参数扫略(储热系数η=10%、20%、50%、100%),揭示了采空区不同散热条件下遗煤氧化蓄热过程中化学反应速率、煤温随时间的变化特性以及化学反应速率与煤温之间的变化特性。结果表明:耗氧率呈负指数形式变化,煤温依次经历缓慢升温、快速升温等阶段,模拟结果与之前相关学者的研究结果相吻合;化学反应场和传热场在煤氧化蓄热过程中呈现出正向协同作用。Under certain conditions,the residual coal in goaf will be heated up by oxidation and heat accumulation.Taking the chemical reaction field and heat transfer field in the process of coal oxidation as the research objects,the coupling model of chemical reaction field and heat transfer field is proposed,and the control equations have been established;with parameters sweeping(heat storage coefficient η =10%,20%,50%,100%),the change characteristics of chemical reaction rate and coal temperature over time and the change characteristics between chemical reaction rate and coal temperature in the process of coal oxidation heat storage in goaf under different heat dissipation conditions are revealed.The results show that the oxygen consumption rate changes in the form of negative exponential,and the coal temperature successively goes through the stages of slow rising and fast rising,which is consistent with the previous research results by relevant scholars;the chemical reaction field and heat transfer field show a positive synergistic effect in the process of coal oxidation.

关 键 词：氧化蓄热 采空区遗煤 氧化动力学 多场耦合 数值模拟 

分 类 号：TD752.2[矿业工程—矿井通风与安全]