Effect of overfire air on combustion and NO<sub>x</sub> formation characteristics in a 1 000 MW ultra-supercritical boiler

ZHOU Ke; LIU Mingyu; CHEN Shengjun; CHEN Sheng

doi:10.19666/j.rlfd.202212241

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Effect of overfire air on combustion and NO_x formation characteristics in a 1 000 MW ultra-supercritical boiler

更新时间：2025-09-28

- Effect of overfire air on combustion and NO_x formation characteristics in a 1 000 MW ultra-supercritical boiler
- Thermal Power Generation Vol. 52, Issue 9, Pages: 138-146(2023)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华中科技大学煤燃烧国家重点实验室
  3. 华能(浙江)能源开发有限公司玉环分公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202212241
  CLC： X701;TM621.2
- Published：2023
- 稿件说明：
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ZHOU Ke, LIU Mingyu, CHEN Shengjun, et al. Effect of overfire air on combustion and NO_x formation characteristics in a 1 000 MW ultra-supercritical boiler[J]. Thermal power generation, 2023, 52(9): 138-146.
DOI：

ZHOU Ke, LIU Mingyu, CHEN Shengjun, et al. Effect of overfire air on combustion and NO_x formation characteristics in a 1 000 MW ultra-supercritical boiler[J]. Thermal power generation, 2023, 52(9): 138-146. DOI： 10.19666/j.rlfd.202212241.

摘要

针对1台650℃等级超超临界1 000 MW机组旋流对冲锅炉的炉内低氮燃烧问题，建立三维计算流体力学数值模拟，探究其在燃尽风变化的情况下，炉膛内流动、燃烧与传热变化以及燃尽风率对烟气中NO_x体积分数的影响。结果表明：设置错位燃尽风，并将前墙低位燃尽风向下15°喷入炉膛有利于降低NO_x体积分数，提高燃尽率；较低燃尽风率会造成炉内主燃区温度高、范围大，受热面与炉内高温区距离减小；炉膛出口NO_x体积分数随燃尽风率增加呈现先下降再升高的变化规律，最佳燃尽风率约为33.9%。

Abstract

Three-dimensional computational fluid dynamics simulations are performed for a 650 ℃ grade 1 000 MW ultra-supercritical swirl-opposed firing boiler with low NO_x combustion in the furnace. The flow and combustion characteristics in the furnace and the NO_x concentration in the flue gas are investigated under various conditions of overfire air. It is shown that setting a staggered overfire air and injecting the lower OFA with the angle 15° downward into the furnace is helpful to reduce NO_x concentration and improve the burnout rate. A lower overfire air ratio results in a higher temperature in the region of the combustor and a shorter distance between the high-temperature region and the heating surface. As the overfire air ratio increases

the NO_x concentration of the flue gas at the exit of the furnace first decreases and then increases

and the optimal overfire air ratio is around 33.9%.

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Effect of overfire air on combustion and NOx formation characteristics in a 1 000 MW ultra-supercritical boiler

DOI：10.19666/j.rlfd.202212241

摘要

Abstract

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references

Effect of overfire air on combustion and NO_x formation characteristics in a 1 000 MW ultra-supercritical boiler