空隙维度下煤自燃气固耦合换热模拟

Simulation of coal-fired gas-solid coupling heat transfer in porosity dimension

为研究采空区漏风通道内漏风流经微元煤体的热量散失状况,根据传热学、传质学理论,采用气固耦合模型,使用Fluent软件模拟了采空区漏风状况及在空隙维度下风流流经微元煤体表面的流动换热过程。结果表明:微元煤体换热过程与漏风流速有关,并影响着煤自燃蓄热与散热的平衡过程,风流流速慢、煤体温度与风流温差较小时,不利于煤体热量的散失;反之,有利于煤体热量的散失。

Basic on the theory of heat transfer and mass transfer, the heat loss of the wind leakage through the micro-coal in the air leakage channel of the goaf is simulated, using Fluent software. The results show that the micro-body coal heat transfer process is closely related to the air leakage flow rate, and affects the balance process of coal spontaneous combustion heat storage and heat dissipation. Slow wind flow rate and small temperature difference between coal body and air flow is not conducive to the loss of coal heat.