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偏微分质量守恒方程能够简化为一组线性方程组并用以描述煤焦的反应性,但其计算量偏大,且计算结果也不一定收敛。文中根据反应过程中煤焦孔隙率和表面积之间的非线性变化特征,利用一种逼近的方法简化和求解偏微分质量守恒方程,并最终建立在扩散控制条件下预测煤焦反应性的逼近模型。通过与Rafsanjani模型比较发现,该模型计算得到的数值比Rafsanjani模型计算得到的数值更接近实际情况。基于该模型,分析了焦作无烟煤、云浮烟煤和西阳村贫煤在不同温度下O2/CO2燃烧的特性。
The partial differential mass conservation equation can be simplified as a set of linear equations and used to describe the char reactivity, but its calculation is too large, and the calculation results do not necessarily converge. In this paper, according to the non-linear change characteristics of coal coke porosity and surface area during the reaction process, an approximation method is used to simplify and solve the partial differential mass conservation equation. Finally, an approximation model for predicting coal coke reactivity under diffusion control conditions is established . Compared with the Rafsanjani model, it is found that the numerical value calculated by this model is closer to the actual value than the value calculated by the Rafsanjani model. Based on the model, the characteristics of O2 / CO2 combustion at different temperatures of Jiaozuo anthracite, Yunfu bituminous coal and Xiyang village lean coal were analyzed.