600MW机组锅炉低氮燃烧改造  

Retrofit on low NO_x combustion system of a 600MW unit boiler

作　　者：胡志宏[1] 李德功 邵红军 董信光[1] 郝卫东[1] 

机构地区：[1]山东电力研究院,山东济南250002 [2]华电国际邹县发电厂,山东邹城273522 [3]华能沾化热电有限公司,山东滨州256800

出　　处：《热力发电》2014年第4期131-134,共4页Thermal Power Generation

摘　　要：为降低NO2排放浓度，通过更换低氮燃烧器，增加燃尽风喷嘴，采用分级燃烧技术对一台600MW对冲燃烧锅炉进行了低氮燃烧改造，使NO2排放浓度由750～900mg／m3降低到350mg／m3以下，同时锅炉飞灰含碳量没有明显变化。改造后在燃尽风全关的情况下NO2排放浓度即可降低40％，且随燃尽风量增大NO2排放浓度继续降低。针对改造后过热器减温水量明显增加问题，提出了采用部分低温过执器置换为省煤器的方案．以降低减温水流量．To reduce the NO2emission, transformation on a 600 MW unit opposed firing boiler was performed, by replacing the low NO2burners,adding overfire air （OFA） nozzles and adopting air- staged combustion technology. After the retrofit, the NOx emission decreased from 750--900 mg/m3 to lower than 350 mg/m3 and the spray water flow rate of super-heater in-creased, but the unburned carbon in fly ash had nearly no change. The NOx emission decreased by 40 % even the OFA dampers were fully closed, and it kept on decreasing with the increasing OFA. To reduce the significantly increased spray water flow rate, suggestion that parts of the lower- temperature superheater pipes be replaced by economizer pipes was proposed.

关 键 词：对冲燃烧 低氮燃烧器 锅炉改造 空气分级燃烧 NOX排放 

分 类 号：TK227.1[动力工程及工程热物理—动力机械及工程]