摘要
以某电厂低氮改造后的600MW亚临界、前后墙对冲燃烧锅炉为研究对象,基于CO在线测量以及燃烧调整试验,通过调节不同的燃尽风开度,改变省煤器出口的CO体积分数、NOx质量浓度,计算出各工况下锅炉效率,并建立了锅炉燃烧优化模型.研究结果表明,CO体积分数与锅炉效率、烟气NOx质量浓度以及综合成本相关性显著,燃料成本对锅炉运行经济性的影响远高于脱硝成本,CO体积分数最低的工况即为综合成本最低的工况.考虑到综合成本最低工况下的烟气NOx质量浓度偏高,以及由此造成的空预器检修周期、催化剂更换周期与机组停炉检修周期的不一致,因此应综合考虑锅炉效率与烟气NOx质量浓度,通过调节合适的CO体积分数,使得在保证锅炉高效率运行的同时满足NOx质量浓度的改造运行要求.
A 600MW sub-critical and front-rear wall opposed combustion boiler used in a power plant,which had been retrofitted using the low NOx combustion technology,was adopted as the research object of this paper. CO online monitoring and combustion adjustment experiments revealed that the concentrations of CO and NOx at the economizer outlet were changed by adjusting different burnout damper openings. The boiler efficiencies under various working conditions were calculated.On this basis,a boiler combustion optimization model was established. Research results show that the CO concentration was significantly correlated with the boiler efficiency, NOx concentration in flue gas,and overall cost.The effect of fuel cost on the economical efficiency of boiler operation was much higher than that of denitrification cost,and the condition with the lowest concentration of CO was the one with the lowest comprehensive cost.Considering the high concentration of NOx in flue gas at the lowest comprehensive cost,as well as the inconsistency among the maintenance cycle of air preheater,catalyst replacement cycle,and the maintenance cycle of unit shutdown,the boiler efficiency and NOx concentration in flue gas should be considered comprehensively.By adjusting an appropriate CO concentration,the requirement of NOx concentration during the retrofit operation can be satisfied while ensuring the high-efficiency operation of the boiler.
作者
张晨浩
苏胜
常寿兵
欧阳朱峰
任强强
江紫薇
王鹏
周敬
崔晓宁
胡松
汪一
向军
Zhang Chenhao;Su Sheng;Chang Shoubing;Ouyang Zhufeng;Ren Qiangqiang;Jiang Ziwei;Wang Peng;Zhou Jing;Cui Xiaoning;Hu Song;Wang Yi;Xiang Jun(State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China;Walsn Energy Technology(Langfang)Co.,Ltd,Langfang 065000,China)
出处
《燃烧科学与技术》
EI
CAS
CSCD
北大核心
2019年第4期347-352,共6页
Journal of Combustion Science and Technology
基金
国家重点研发计划资助项目(2017YFB0601802)
国家自然科学基金资助项目(51576081)
关键词
CO在线监测
锅炉效率优化
烟气NOx浓度优化
综合燃烧优化模型
CO online monitoring
boiler efficiency optimization
optimization of NOx concentration in flue gas
integrated combustion optimization model
