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考虑到多孔介质中传热传质对松散煤体低温氧化温度场和浓度场的交叉耦合作用,对松散煤体低温氧化过程中氧的扩散与反应、热的传递建立数学模型,并对其无量纲化,得出表征传热传质耦合的无量纲扩散附加热效应准则数DCT和热附加扩散效应准则数STC。根据建立的数学模型可见:DCT与STC有加速热量传递和质量扩散的作用;松散煤体氧化初期,浓度差是热量传递的主要动力;松散煤体内部进入稳定氧化阶段后,热效应是气体的扩散的主要动力。
Taking into account the cross-coupling effect of heat and mass transfer in porous media on the low-temperature oxidation temperature field and concentration field of loose coal, a mathematical model is established for the diffusion and reaction of oxygen and the transfer of heat during the low-temperature oxidation of loose coal, Dimensionless, nondimensional diffusive additional heat effect criterion for characterizing heat and mass transfer coupling. According to the established mathematical model, DCT and STC have the effect of accelerating heat transfer and mass diffusion. At the initial stage of loose coal oxidation, the concentration difference is the main driving force of heat transfer. The thermal effect is the diffusion of gas after the loose coal enters the stable oxidation stage The main driving force.