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拱上燃尽风入射角度对W火焰锅炉气固流动特性的影响

DOI: 10.13334/j.0258-8013.pcsee.2015.12.020, PP. 3081-3088

Keywords: FW型W火焰锅炉,拱上布置燃尽风,气固流动特性,低NOx技术

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Abstract:

以一台660MW机组的FW型W火焰锅炉为研究对象,提出了拱上布置燃尽风(OFA)技术及配套高效燃烧措施。建立了1:15气固两相冷态试验台,采用三维激光相位多普勒分析仪研究了OFA入射角度对炉内气固两相的平均速度、脉动速度、颗粒体积流量以及颗粒平均粒径等气固两相流动特性参数的影响。随着OFA入射角度的增加,浓煤粉气流的射流深度有所减小,固相颗粒在下炉膛的停留时间缩短。OFA气流穿透深度随入射角度增加呈先升高后降低的趋势。当入射角度为20°时,OFA气流在水平和竖直方向上的气固两相速度和脉动速度均衰减较慢,而且OFA气流与拱下回流区互不影响,能够与上行气流充分且剧烈的混合。对于拱上布置OFA,认为入射角度为20°较合适。

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