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通过数值计算方法研究了弯管和文丘里管组合结构燃烧器的浓淡分离特性,分析了煤粉颗粒直径和煤粉密度变化对燃烧器出口浓淡分离特性的影响.结果表明:弯管和文丘里管组合结构的燃烧器既可以实现浓淡分离,又可以达到煤粉浓侧气流不贴壁和中间给粉的效果;当煤粉颗粒直径为10μm时,浓淡分离效果不明显;当颗粒直径为50μm时,分离效果较好,并且浓度核心的最大煤粉浓度随着St的增大而增大;当颗粒直径为100μm时,随着St的增大,出现了多个浓度核心.
The numerical simulation method was used to study the light and dark separation characteristics of the combustor with bent pipe and Venturi combustor.The influence of the variation of pulverized coal particle diameter and pulverized coal density on the exit and light separation of the combustor was analyzed.The results showed that: The combustor of the pipe combination structure can not only achieve the shading separation but also achieve the effect that the pulverized coal rich side airflow does not attach to the wall and the middle to the powder; when the coal powder particle diameter is 10 μm, the shading separation effect is not obvious; when the particle diameter is 50 μm , The separation effect is better, and the maximum concentration of pulverized coal in the concentration core increases with the increase of St; when the particle diameter is 100μm, with the increase of St, multiple concentration cores appear.