配备旋流燃烧器的“W”火焰锅炉着火与稳燃机理研究

以某发电公司1、2号机组锅炉为研究对象,对配备旋流燃烧器的“W”火焰锅炉运行中存在的燃烧不稳、飞灰可燃物偏高的问题进行了试验研究,在对试验现象分析的基础上,对配备旋流燃烧器的“W”火焰锅炉的着火、稳燃机理进行了揭示。试验及理论分析表明,配备旋流燃烧器的“W”火焰锅炉的燃烧系统的实际运行性能与设计预想存在显著不同：① 旋流燃烧器的高温烟气内回流对一次风射流的着火过程并无积极影响,辐射吸热在一次风射流的吸热着火过程中起着重要的作用,煤粉气流的着火是在远离喷口的空间发生的;② 降低燃烧器的旋流强度设置,增加了煤粉气流的下射深度,燃烧稳定性增强,燃烧经济性趋好。

Study on Ignition and Flame Stabilization Mechanism of Down-Shot Firing Boiler with Swirl Burners

The experimental study is conducted on the problems of instable combustion and high combustibles in fly ash which exist in two 600-MW down-shot firing boilers of a power plant equipped with swirl burners. Based on the analysis of the experiment phenomena, the ignition and combustion stabilization mechanisms are discovered, The experimental and theoretical analysis show that: first, it is not the inner gas recirculation of the high temperature flue gas in the swirl burners but the radiation heat absorption plays the important role in the ignition process of the primary air jet, which happens far from the burner nozzle; second, the combustion stability is enhanced and the economics of the combustion is improved with the lower swirl intensity setting and deeper penetration into the lower furnace.