煤氧复合热效应的影响因素分析

煤的氧化放热是引起煤自燃的主要原因。煤氧复合热效应与耗氧速率和表面反应热有关。通过分析得出 ,q(z,n,CO2 ,T,d5 0 ) =h(Z) .g(n) .f (CO2 ) .I(T) .Ψ (d5 0 )。其中主要影响因素为煤结构、温度、氧浓度及粒度。根据威斯化学结构模型、本田化学结构模型及煤分子中包含的 7种表面活性结构 ,推出煤自燃表面分子结构模型 ,并分析其表面活性结构的种类、数量、活泼性 ,它们随煤体不同而千差万别 ;表面活性结构随温度变化的氧化活泼性及反应过程不同 ,造成煤表面氧化反应热 H不同。外在主要影响因素—煤的温度、氧浓度、粒度不同造成了耗氧速率 VO2 不同 ,使煤的放热强度不同。对此 ,通过 XK型煤自然发火实验台及 XKS程序升温实验台进行了实验分析

Analysis on Influential factors of Thermal Effect in Coal Oxidation

Exothermic oxidation of coal is the main cause of spontaneous combustion. The combined thermal effect of coal and oxygen correlates with the rate of oxygen consumption and surface reactive heat. Through analysis it is obtained that q(z，n，CO2，T，d50)=h(Z)*g(n)*f(CO2)*I(T)*Ψ(d50).Among them, the structure of coal, environment temperature, oxygen consumption, and particulate distribution of coal are the main influential factors. According to Waish chemical structure model for coal spontaneous combustion, Bentain model, and the active surface structure, it is found that the spontaneous combustion of coal differs obviously with the kind, number and activity of the active surface structure of coal. Different oxidizing activity and process with different environment temperature produce different surface reactive heat. The external factors, namely the temperature of coal, oxygen concentration, and different particulate distribution, cause the different rate of oxygen consumption VO2 and different exothermic intensity. The results are tested by XK coal spontaneous combustion experiment set and XKS program temperature ascending experiment set.