煤反向过滤燃烧涉及煤炭清洁燃烧、污染物和灾害防控,深入研究反向过滤燃烧波模型对我国实现碳中和以及可持续发展的目标有重要意义。但目前该模型研究尚存在几个待解决的关键问题:①传统氧气组分运输方程难以解决气固两相之间氧气非均衡的问题。②对于过滤燃烧波反向传播动态过程的动力学和供氧控制机制缺乏深入的分析。基于此,构建包含了五步反应体系的反向过滤燃烧波数值模型。同时采用2种不同煤样(烟煤CC和无烟煤XA)在不同的流量条件下(8、32、64L/min),对反向过滤燃烧进行试验研究。研究结果表明:通过试验对数值模型进行了验证,所构建的模型与试验吻合较好,且其成功预测了反向过滤燃烧波传播过程。随着流量降低,氧气的供应减弱,反应活性减小,峰值温度与传播速率随之减少。同时,峰值温度也受煤样种类的影响,在同一流量条件下,XA煤样的温度要低于CC煤样。随着反应温度增加,反应速率加快,反向过滤燃烧的控制机制由动力学机制向氧气传输机制转变。

Coal reverse filtration combustion involves clean coal combustion,pollutant and disaster prevention and control. In-depthstudy of reverse filtration combustion wave model is of great significance for China to achieve carbon neutrality and sustainabledevelopment. In-depth study of the reverse filtration combustion wave model is of great significance for China to achieve the goal ofcarbon neutrality and sustainable development. However,there are still several key problems to be solved in this model :① The traditionaloxygen component transport equation is difficult to solve the problem of oxygen non-equilibrium between gas and solid phases. ② Thereis a lack of in-depth analysis of the dynamics and oxygen supply control mechanism of the reverse propagation dynamic process offiltration combustion wave. Based on this,a numerical model of reverse filtration combustion wave including five-step reaction system isconstructed. At the same time,two different coal samples ( bituminous coal CC and anthracite XA ) were used to study the reversefiltration combustion under different flow conditions (8,32,64 L/min ). The results show that : The model is in good agreement withthe experiments,and it successfully predicts the propagation process of reverse filtration combustion wave. As the flow rate decreases,thereduction in oxygen supply leads to reduced reactivity,resulting in a decrease in both peak temperature and propagation rate. At the sametime,the peak temperature is also affected by the type of coal sample. Under the same flow condition,the temperature of XA coal sample islower than that of CC coal sample. As the reaction temperature increases,the reaction rate accelerates,and the limiting conditions ofreverse filtration combustion from kinetic mechanism to oxygen transport mechanism.