低氮改造后再热汽温偏低的燃烧调整研究  

Study on Low Reheat Steam Temperature After Low NO_x Retrofit Based on Combustion Adjustment

作　　者：胡胜林 李源 毛睿 詹胜平 任利明 郭志成 岑可法[2] HU Shenglin;LI Yuan;MAO Rui;ZHAN Shengping;REN Liming;GUO Zhicheng;CEN Kefa(Rundian Energy Science and Technology Co., Ltd., Zhengzhou 450042, Henan Province, China;State Key Laboratory of Clean Energy Utilization (Zhejiang University), Hangzhou 310027, Zhejiang Province, China)

机构地区：[1]润电能源科学技术有限公司,河南省郑州市450042 [2]能源清洁利用国家重点实验室(浙江大学),浙江省杭州市310027

出　　处：《发电技术》2019年第5期475-480,共6页Power Generation Technology

基　　金：国家自然科学基金创新研究群体项目(51621005)~~

摘　　要：针对某330MW燃煤锅炉低氮改造后出现的再热汽温偏低问题,从锅炉燃烧调整策略角度进行对策研究,主要分析了燃烧器摆角、配风方式、燃烧器投运层分布、上层煤种、上层煤粉细度、水平烟道吹灰和机组自动调节品质等因素对再热汽温的影响。结果表明,再热汽温偏低的现象主要出现在锅炉中低负荷(250MW以下)工况,通过增加燃烧器仰角、采用倒宝塔配风方式、提高上层燃烧器利用率、加大上层入炉煤发热量、减小上层入炉煤粉细度、加强水平烟道吹灰和优化机组自动调节品质等手段可改善再热汽温偏低问题。提出的燃烧调整策略对同类锅炉改造问题具有重要借鉴意义。To solve the problem of low reheat steam temperature after low NOx retrofit in a 330MW coal-fired boiler, the countermeasure study was conducted based on combustion adjustment strategies. The effects of burner angle, air distribution mode, burner layer distribution, coal type of upper layer, coal fineness of upper layer, ash blowing of horizontal flue, and automatic control quality on reheat steam temperature were analyzed. The results indicate that the low reheat steam temperature mainly occurs at medium-low load (lower than 250 MW). Increasing burner angle, using inverted tower air distribution, increasing utilization rate of upper burner, improving coal calorific of upper layer, decreasing coal fineness of upper layer, strengthening ash blowing of horizontal flue and optimizing automatic control quality are conducive to improving the reheat steam temperature.The proposed combustion adjustment strategies provide important reference for the similar problem in boiler retrofit.

关 键 词：燃煤锅炉 低氮改造 再热汽温 燃烧调整 

分 类 号：TM621.2[电气工程—电力系统及自动化]