近几年在工业、民生所用的燃气锅炉污染物排放居高不下,且这些燃气锅炉具有容量小、数量多等特点,如何降低其NOx排放已经引起关注.继北京2015年颁布燃气锅炉NOx排放质量浓度要求低于30 mg/m3以来,郑州、西安、青岛、成都也相继出台了燃气锅炉NOx排放质量浓度低于30 mg/m3的相关政策.为了满足排放要求,各燃烧器厂家普遍采用低氮燃气燃烧器配合烟气再循环(FGR)技术来降低NQx排放,但与此同时,也出现了NOx排放和CO偏高、燃烧不稳定、火焰喘振及爆燃等问题.对此,本文采用低氮燃烧器+FGR对某化工动力公司120t/h燃气锅炉进行了改造,使NOx排放质量浓度控制在30 mg/m3以下,且未出现脱火、爆燃等问题,为后续市场应用打下坚实基础.%In recent years,the NOx emission from industrial and municipal gas-fired boilers remains at a relatively high level,and these gas-fired boilers usually have small capacity and large numbers.Reducing the NOx emission from gas-fired boilers has attracted much public attentions.In 2015,the Beijing government required that the NOx emission from the gas-fired boilers should be lower than 30 mg/m3.Then,in Zhengzhou,Xi'an,Qingdao and Chengdu,the relevant policies (NOx emission from gas-fired boilers should be below 30 mg/m3) have also been published.In order to meet the emission control requirements,low NOx gas burners equipped with flue gas recirculation (FGR) technology are widely applied to lower the NOx emission.However,this method has the problems of high NOx and CO emissions,unstable combustion,flame surge and deflagration.To solve this problem,this paper modified the low NOx gas burners for a 120 t/h gas-fired boiler based on the FGR technology.The results showed that the NOx emission could remain below 30 mg/m3 and the problem of blow-off and deflagration did not occur.This successful transformation lays a solid foundation for application of the new low NOx gas burner based on the FGR system.
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