_W_型火焰锅炉二次风改造对燃烧影响的试验研究

针对美国FW (Foster Wheeler)技术"W"型火焰锅炉高负荷下飞灰含碳量高,补风困难、屏过易超温等问题和不足,对某电厂一台该类型1 025 t/h锅炉进行了F层二次风入射角下倾25°改造,通过数据模拟及冷热态对比试验结果表明,改造后高负荷效果明显,额定负荷时一次风行程有效延长,补风困难、屏过超温的问题得到了解决,减温水减少20.9%,固体不完全燃烧损失降低了1.5%以上.

Experimental Study of the Influence of the Secondary Air Modification of a "W" Type Flame Boiler on Combustion

In the light of the problems and deficiencies of a "W" type flame boiler of FW (Foster Wheeler) technology at high loads,the authors have reconstructed a 1 025 t/h boiler of the same type in a power plant by decreasing the incidence angle of F-layer secondary air downward by 25 degrees.The problem and deficiencies include:a high combustible content of fly-ash at high operating loads,difficulty in combustion air replenishment and susceptibility to screen type superheater overheating,etc.Through a data simulation and a cold and hot state contrast test,it has been found that the advantages resulting from the reconstruction are evident at boiler high loads.At the rated load,primary air path is effectively lengthened and the above-mentioned problems,such as the air replenishment difficulty and overheating of the screen type superheater,have been solved or eliminated.The desuperheating water requirement is cut by 20.9% and the solid incomplete combustion loss decreases by over 1.5%.