煤反向过滤燃烧波模型与反应−运输控制机制研究  

Reverse filtration combustion wave of coal and kinetic-transport regimes

作　　者：张浩 宋泽阳 赵重保 惠绍棠 党博源 ZHANG Hao;SONG Zeyang;ZHAO Chongbao;HUI Shaotang;DANG Boyuan(College of Safety Science and Engineering,Xi’an University of Science and Technology,Xi’an,710054,China)

机构地区：[1]西安科技大学安全科学与工程学院,陕西西安710054

出　　处：《洁净煤技术》2025年第1期192-200,共9页Clean Coal Technology

基　　金：国家自然科学基金资助项目(51804168);陕西省科技厅面上资助项目(2023-JC-YB-432);陕西省高层次青年科技人才项目和新疆重点研发资助项目(2022B03025-2)。

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

关 键 词：过滤燃烧 燃烧波 地下煤气化 阴燃 控制机制 

分 类 号：TD752[矿业工程—矿井通风与安全]