摘要
结合全预混金属纤维表面燃烧器和外部烟气再循环燃烧技术,在350kW卧式燃气锅炉上进行了实验研究.研究了负荷、过量空气系数和烟气再循环率对CO、NOx排放和燃烧稳定性的影响.结果表明:负荷变化对NOx排放无明显影响;过量空气系数越大,NOx排放越低,但系统热效率随之降低;不采用烟气再循环技术时,NOx排放低于30mg/m^3时过量空气系数需大于1.73,此时系统热效率低于92.1%;如采用23%的烟气再循环率,实现上述相同NOx排放水平仅需过量空气系数大于1.3,系统热效率比无烟气再循环时高1.3%;随着烟气再循环率的增大,火焰燃烧不稳定加剧.出现炉膛震动时的烟气再循环率极限值随着负荷的增大而逐渐提高.
This paper combines a premixed metal fiber surface burner with external flue gas recirculation. An experimental study was performed on a 350 kW horizontal gas boiler,and the effects of load,excess air ratio,and flue gas recirculation rate on CO,NOx emissions,and combustion stability were studied. The results showed that changes in load had no significant effect on NOx emissions. The greater the excess air ratio,the lower the NOx emissions. However,the system’s thermal efficiency was also reduced. NOx emissions were lower than 30 mg/m^3 when the excess air ratio was greater than 1.73 in the absence of flue gas recirculation,with the system’s thermal efficiency lower than 92.1%. When the flue gas recirculation rate was 23%,the excess air ratio was greater than 1.3,and NOx emissions of less than 30 mg/m^3 were achieved. Meanwhile,the system’s thermal efficiency was 1.3% higher than that without flue gas recirculation. With the increasing recirculation rate,the flame became unstable. The flue gas recirculation rate limit causing combustion instability increased gradually with increasing load.
作者
安文旗
朱彤
潘登
管坚
于吉明
高乃平
An Wenqi;Zhu Tong;Pan Deng;Guan Jian;Yu Jiming;Gao Naiping(School of Mechanical and Energy Engineering,Tongji University,Shanghai 201804,China;China Special Equipment Inspection and Research Institute,Beijing 100029,China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2019年第4期365-371,共7页
Journal of Combustion Science and Technology
基金
国家重点研发计划资助项目(2017YFF0209801)
关键词
金属纤维表面燃烧器
烟气再循环
过量空气系数
排放特性
热效率
燃烧稳定性
metal fiber surface burner
flue gas recirculation
excess air ratio
emission characteristics
thermal efficiency
combustion stability
