200MW锅炉空气分级低NO_x燃烧改造实验研究  

Experimental Study of an Air-staged and Low NO_x Emission-based Combustion Modification to a 200 MW Boiler

作　　者：张晓辉[1] 孙锐[1] 孙绍增[1] 秦明[1] 

机构地区：[1]哈尔滨工业大学能源科学与工程学院,黑龙江哈尔滨150001

出　　处：《热能动力工程》2008年第6期676-681,共6页Journal of Engineering for Thermal Energy and Power

基　　金：2005年度教育部新世纪优秀人才支持计划子基金资助项目(NCET-05-0336);国家自然科学基金资助项目(50576020);黑龙江省科技攻关基金资助项目(WC.04109)

摘　　要：针对北京地区某电厂200MW燃烟煤机组进行低NOx燃烧系统改造,采用了燃尽风(OFA)与水平浓淡低NOx燃烧器相结合的立体分级燃烧低NOx燃烧系统。改造后氮氧化物(NOx)排放浓度有明显改善,采取均等配风方式时,下降幅度达45%～60%;采取合适的燃尽风喷口水平摆动角度,可有效缓解炉膛出口烟温偏差,偏差可控制在50℃范围内;在NOx排放量得到明显改善的同时,锅炉效率提高1%左右。改造后任一工况下的NOx排放浓度均低于400mg/m3,同时为尾部烟气脱硝(SCR)装置提供更为经济的入口条件。To reconstruct the combustion system of a 200 MW bitumite-fired boiler in a power plant in Beijing region for reducing NOx emissions,a cubic-staged low-NOx emission combustion system combining overfired air (OFA) with low-NOx emission burners of horizontal bias-combustion was used.After the modification,the NOx emissions concentration has been improved conspicuously.The above-mentioned concentration can be reduced by 45% to 60% when an equalization air distribution mode was adopted.The use of a proper horizontal swinging angle for the OFA nozzle will effectively lessen the flue gas temperature deviation at the furnace outlet,which can be controlled within a range of 50 ℃.In addition to a marked lowering of NOx emissions,the boiler efficiency can be enhanced by about 1%.After the modification,the NOx emissions concentration at any operating condition is all below 400 mg/m3 and in the meantime,this can provide more favorable inlet conditions for tail portion flue-gas SCR (Selective Catalyst Reduction) device.

关 键 词：燃煤锅炉 分级燃烧技术 OFA 水平浓淡低NOx燃烧器 NOx排放浓度 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]