一种煤粉着火的数学模型——(2)试验验证

A Mathematical Model for Pulverized Coal Ignition (Ⅱ): Experimental Verification

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.

A mathematical model of pulverized coal ignition was established by comprehensively taking account of the main factors that influence the ignition of the pulverized coal stream. Through analysis and simplification for the physical process of pulverized coal ignition, the important parameters such as burner structure, operational condition, etc. were introduced, and a dimensionless criterion number Co was derived. The calculation results indicate that with the increase of Co, the ignition characteristic of pulverized coal stream is improved and the emission concentrations of the pollutants are reduced. The above mentioned conclusion was verified by the hot test. Results show that the dimensionless number Co can be applied to boilers with different burner structures, different coal ranks and different capacities, which offets reference basis for the optimized design of burner, the effective utilization of fuel and control of pollutants emission.