摘要
在1∶15冷态模化试验台上对一台350MW英巴W火焰炉进行了不同分级风率（14％、20％和25％）下的冷态模化试验,并在实炉上开展了不同分级风挡板开度（25％、35％和45％）下的大型热态测试.结果表明：冷态模化试验中各工况下炉内均呈现“前长后短”偏斜流场,且随着分级风挡板开度的增大,流场偏斜加剧;3个分级风挡板开度下炉内均呈现前墙侧烟气温度明显高于后墙侧的不对称燃烧特征,这与该炉型拟形成对称W形火焰的燃烧设计理念相悖;炉内烟气温度高、下炉膛空间大和分级燃烧程度低,使得锅炉在维持良好燃尽的同时,NOx排放质量浓度高达1 594～1 707 mg/m^3;综合冷态模化试验结果和工业试验测试,分级风挡板开度以35％为宜,此时分级风率约为18％.
Cold-state airflow tests at different staged-air ratios （14%, 20% and 25%） and industrial-size hot-state experiments at different staged-air damper openings （25 %, 35 % and 45 %） were respectively performed in a 1：15-scaled model furnace and in a real furnace of a 350 MW MBEL W-shaped flame boiler. Results show that a deflected flow field would form in the model furnace under all the cold-modeling conditions, with the downward airflow near front wall penetrating deeper than that near rear wall, and with the rise of damper opening, the deflecting degree would get higher; whereas, under all the three conditions with different damper openings, an asymmetrical combustion pattern is to appear in the rear furnace, where the level of gas temperature near front wall would be clearly higher than that near rear wall, devia- ting from the designed concept of symmetrical W-shaped flame. To keep a high level of burnout rate, the NOx emission may reach 1 594-1 707 mg/m^3 , due to the high in-furnace gas temperature, large space of lower furnace and low level of staged-air combustion. Comprehensively considering the results of both the modeling test and the industrial-size experiment, the damper opening is recommended to be 35%, when the corresponding staged-air ratio is 18%.
出处
《动力工程学报》
CAS
CSCD
北大核心
2015年第8期605-612,618,共9页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金青年资助项目(51306167)
国家自然科学基金委创新研究群体资助项目(51121004)
关键词
英巴W火焰炉
分级风
燃烧特性
流场
MBEL W-shaped flame boiler
staged air
combustion eharacteristic
flow field
