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综合考虑影响煤粉气流着火的主要因素,建立了煤粉气流着火的数学模型.通过对煤粉气流着火的物理过程进行分析和简化,引入燃烧器结构和运行工况等重要参数,推导出1个无量纲准则数Co.计算结果表明:当准则数Co增大时,煤粉气流的着火特性得到改善且污染物排放浓度降低.用热态试验结果对以上结论进行了验证,结果表明:无量纲准则数Co可适用于不同的煤种、燃烧器结构和不同容量的锅炉,为燃烧器的优化设计、燃料的高效利用以及污染物排放的控制提供了参考依据.
Considering the main factors that affect the ignition of pulverized coal airstream, a mathematical model of the ignition of pulverized coal airstream is established.By analyzing and simplifying the physical process of pulverized coal flow, the structure and operating conditions of the burner are introduced, The results show that the ignition characteristics of pulverized coal airstream are improved and the concentration of pollutant emission is reduced when the number of Co increases.The results of the above conclusions are validated by the results of the thermal test.The results show that: The criterion number Co can be applied to different kinds of coal, burner structure and boilers with different capacities, which provides reference for the optimization design of burners, efficient use of fuel and pollutant emission control.