Numerical simulation on combustion characteristics of a 660 MW opposed firing boiler with staggered layout of lower over fire air

宋和斌; 郭修文; 韩金克; 夏永俊; 吴建群; 李志华; 方庆艳

doi:10.19666/j.rlfd.202503044

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Numerical simulation on combustion characteristics of a 660 MW opposed firing boiler with staggered layout of lower over fire air

Thermal Power Generation Vol. 54, Issue 8, Pages: 152-159(2025)

更新时间：2026-08-11

- Numerical simulation on combustion characteristics of a 660 MW opposed firing boiler with staggered layout of lower over fire air
- 作者机构：
  
  1. 江西赣能股份有限公司
  2. 江西省工业烟气二氧化碳综合利用(CCUS)工程研究中心
  3. 江西江投能源技术研究有限公司
  4. 国家能源集团江西电力有限公司
  5. 华中科技大学煤燃烧与低碳利用全国重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202503044
  CLC： TM621.2
- Published：2025
- 稿件说明：
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[1]宋和斌,郭修文,韩金克,等.660 MW对冲锅炉下位燃尽风错层布置燃烧特性数值模拟[J],2025,54(08):152-159.
[1]宋和斌,郭修文,韩金克,等.660 MW对冲锅炉下位燃尽风错层布置燃烧特性数值模拟[J],2025,54(08):152-159. DOI： 10.19666/j.rlfd.202503044.

DOI：10.19666/j.rlfd.202503044.

摘要

某660 MW对冲锅炉设计采用下位燃尽风错层布置，投运前墙上层燃烧器时炉膛出口NO

质量浓度高、燃尽效率低，利用数值模拟研究满负荷工况磨煤机组合运行方式和前墙下位燃尽风率、射流角度、喷口高度对锅炉燃烧及NO

排放特性的影响。结果表明：停用前墙上层燃烧器后，NO

排放质量浓度降低了29.49 mg/m

，且飞灰含碳量降低了0.16%，实际运行推荐采用BCDEF层燃烧器组合方式；下位燃尽风总风率不变，前墙下位燃尽风率由10.2%提高到14.2%后NO

排放质量浓度增大，当风率超过13.2%，后墙下位燃尽风不足导致燃尽效率降低，实际运行时前墙下位燃尽风率宜控制在12.2%～13.2%；当前墙下位燃尽风由斜向下15°改为水平喷入后，NO

排放质量浓度降低了18.13 mg/m

，飞灰含碳量增加0.38百分点；前墙下位燃尽风喷口上移对齐后墙下位燃尽风喷口后，NO

排放质量浓度降低了41.78 mg/m

，飞灰含碳量增加0.68百分点。相对常规下位燃尽风喷口对冲布置锅炉，错层布置后深度空气分级燃烧效果减弱，但燃尽率提高，可调节性增强。

Abstract

A 660 MW opposed firing boiler is designed with staggered lower over fire air(OFA) burner arrangement

in response to the problems of high NO

emission and low burn-out efficiency at the furnace outlet caused by the use of upper burners on the front wall

numerical simulation is performed to study the effects of the coal mill combinations

as well as the lower OFA ratios

jection angles

heights of the burners on front wall on the combustion and NO

emission characteristics under full load conditions. The results show that

the NO

emission mass concentration decreased by 29.49 mg/m

and the carbon content in fly ash decreased by 0.16% after the upper burner of the front wall was deactivated. The combined operation mode of BCDEF burners should be selected in actual operation. When keeping the lower OFA ratio unchanged

the NO

emission mass concentration increased after the lower OFA ratio on the front wall was increased from 10.2% to 14.2%. When the air rate exceeded 13.2%

insufficient overfire air at the lower part of the back wall led to a decrease in burnout efficiency. The lower OFA rate on the front wall should be controlled within 12.2%～13.2% during actual operation. The NO

emission mass concentration reduced by 18.13 mg/m

and the carbon content in fly ash increased by 0.38 percentage point after the lower OFA was changed from 15° injection to horizontal injection. When the lower OFA burners on the front wall were moved up to the height of the lower OFA burners on the rear wall

the NO

emission mass concentration decreased by 41.78 mg/m

and the carbon content in fly ash increased by 0.68 percentage point. Compared to the opposed firing boilers with conventional lower OFA burners

the one with staggered layout of lower OFA burners has relatively weak deep air staged combustion effect

but with high burnout rate and better adjustability.

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references

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