Effect of over fire air rate on boiler combustion performance:a numerical simulation

LYU Xuyang; ZHANG Yongsheng; LI Chunxi; YE Xuemin

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Effect of over fire air rate on boiler combustion performance:a numerical simulation

Thermal Power Generation Vol. 44, Issue 5, Pages: 108-112(2015)

更新时间：2025-09-28

- Effect of over fire air rate on boiler combustion performance:a numerical simulation
- 作者机构：
  
  1. 华北电力大学能源动力与机械工程学院
  2. 国网河北省电力公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC： TM621.2
- Published：2015
- 稿件说明：
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LYU Xuyang, ZHANG Yongsheng, LI Chunxi, et al. Effect of over fire air rate on boiler combustion performance:a numerical simulation[J]. Thermal Power Generation, 2015, 44(5): 108-112.
DOI：

LYU Xuyang, ZHANG Yongsheng, LI Chunxi, et al. Effect of over fire air rate on boiler combustion performance:a numerical simulation[J]. Thermal Power Generation, 2015, 44(5): 108-112. DOI：

摘要

对某电厂330MW机组锅炉低NOx燃烧器改造后存在的受热面过热问题

通过数值模拟与试验相结合的方法

研究燃尽风率变化对炉内温度场、氧气质量浓度分布及NOx排放的影响

并将模拟数据与试验结果进行了对比。结果表明:数值模拟与试验研究结果较为吻合

燃尽风率的增加有利于降低NOx排放

但对锅炉运行的安全性和经济性会产生一定影响

综合考虑NOx排放和锅炉运行安全性

燃尽风率应控制在25%~30%。

Abstract

Over high temperature occurred in heating surface of a 330 MW unit boiler after the low NOx burner retrofitting.To solve this problem

the effect of over fire air(OFA)rate on temperature field

oxygen concentration distribution in furnace and NOxemission were numerically investigated

combining with experiment.The results show that

the simulation results agreed well with the experimental results.An increase in OFA rate was helpful to reduce NOxemissions

but had adverse effect on operation safety and economy of the boiler.Comprehensively considering the NOxemissions and operation safety

the OFA rate should be controlled within the range from 25%to 30%.

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