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浙江大学学报(工学版)
浙江大学学报(工学版)
能源工程     
MW燃煤锅炉富氧燃烧改造及NOx排放的数值模拟
游卓,王智化,周志军,胡昕,朱燕群,周俊虎,岑可法
浙江大学 能源清洁利用国家重点实验室,浙江 杭州 310027
Numerical simulation of NOx emission from a 1 000 MW boiler retrofitted to oxy-fuel combustion
YOU Zhuo1, WANG Zhi-hua1, ZHOU Zhi-jun1, HU Xin1, ZHU Yan-qun1, ZHOU Jun-hu1, CEN Ke-fa1
1. State Key Laboratory of Clean Energy Utilization, Zhejiang University, Hangzhou 310027, China
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摘要：

针对燃煤锅炉富氧燃烧改造的可行性以及NOx排放的问题,提出基于CFD数值模拟方法,开展1 000 MW双切圆式燃煤电站锅炉的富氧燃烧改造及其NOx排放的数值模拟研究.结果表明,当氧气体积分数为30%的富氧燃烧条件下模拟的炉膛温度分布、换热结果与改造前空气燃烧时相当.绝热火焰温度一致可以作为改造时氧浓度选择的依据.改造后燃料NOx、热力NOx的生成量均显著降低,总NOx生成量可达改造前的47.3%.大量二氧化碳的存在促进还原区煤焦气化反应和燃料氮的析出,削弱了NOx前驱物的氧化,促进NO还原,从而减少NOx生成量.增大燃烬风风率可降低NOx排放.再循环烟气中的NO的还原使NOx净生成量降低44.6%~71.8%.
Abstract:

 With CFD method, the numerical simulation of retrofit of a 1 000 MW ultra-supercritical boiler to oxy-fuel combustion and the NOx emission were carried out.The results show that, the temperature gradient and heat flux of the furnace are mostly consistent with that of before retrofit under the oxy-fuel combustion with 30% oxygen. Oxygen concentration can be decided when the adiabatic flame temperature of furnace after retrofit is same as that of before retrofit. Both the fuel NOx and thermal NOx decrease remarkably and the total NOx amount after retrofit is reduced to 47.3% of the reference boiler. The decrease of fuel NOx is majorly attributed to the enhancement of coal char gasification and the release of fuel nitrogen during the fuel rich zone, which resulted from the high CO2 concentration. Ehancing the the ratio of over fire air (OFA) would lower the NOx emission. The reduction of recycled NO in flue gasdecreases the net amount of NO by 44.6%~71.8%.
出版日期: 2014-11-01
:  TK 229  
基金资助:

国家“973”重点基础研究发展规划资助项目（2012CB214906）
通讯作者: 王智化，男，教授，博导     E-mail: wangzh@zju.edu.cn
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游卓,王智化,周志军,胡昕,朱燕群,周俊虎,岑可法. MW燃煤锅炉富氧燃烧改造及NOx排放的数值模拟[J]. 浙江大学学报(工学版), 10.3785/j.issn.1008-973X.2014.11.0241 000.

YOU Zhuo, WANG Zhi-hua, ZHOU Zhi-jun, HU Xin, ZHU Yan-qun, ZHOU Jun-hu, CEN Ke-fa. Numerical simulation of NOx emission from a 1 000 MW boiler retrofitted to oxy-fuel combustion. JOURNAL OF ZHEJIANG UNIVERSITY (ENGINEERING SCIENCE), 10.3785/j.issn.1008-973X.2014.11.0241 000.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2014.11.0241 000    或    http://www.zjujournals.com/eng/CN/Y2014/V48/I11/2080

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