Control of NO<sub><i>x</i></sub> Ultra-low Emission on Circulating Fluidized Bed Boiler Under Low Load Condition

QU Lili; YANG Zuwang; WANG Yibin; JIN Limei; LV Zhaomin; TAN Houzhang

doi:10.19805/j.cnki.jcspe.2025.240487

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Control of NO_x Ultra-low Emission on Circulating Fluidized Bed Boiler Under Low Load Condition

更新时间：2025-11-28

- Control of NO_x Ultra-low Emission on Circulating Fluidized Bed Boiler Under Low Load Condition
- Chinese Journal of Power Engineering Vol. 45, Issue 9, Pages: 1354-1362(2025)
- 作者机构：
  
  1. 西安交通大学热流科学与工程教育部重点实验室,陕西,西安,710049
  2. 西安热工研究院有限公司,陕西,西安,710054
  3. 西安格瑞电力科技有限公司,陕西,西安,710049
- 作者简介：
- 基金信息：
- DOI：10.19805/j.cnki.jcspe.2025.240487
  CLC：
- Published Online：16 September 2025，
  
  Published：2025
- 稿件说明：
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瞿丽莉,杨祖旺,王毅斌,金立梅,吕钊敏,谭厚章. 低负荷下循环流化床锅炉NO_x超低排放控制动力工程学报, 2025, 45(9): 1354-1362 https://doi.

org/10.19805/j.cnki.jcspe.2025.240487
瞿丽莉,杨祖旺,王毅斌,金立梅,吕钊敏,谭厚章. 低负荷下循环流化床锅炉NO_x超低排放控制动力工程学报, 2025, 45(9): 1354-1362 https://doi. DOI： 10.19805/j.cnki.jcspe.2025.240487.

org/10.19805/j.cnki.jcspe.2025.240487 DOI：

摘要

针对循环流化床(circulating fluidized bed

CFB)锅炉低负荷运行时NO

难以达到超低排放标准的难题

提出增加上层二次风以实现分级送风

再优化播煤风、下层二次风及喷氨格栅结构的方法

并且将该方法应用于某350 MW机组。借助计算流体力学和计算颗粒流体力学方法分别对单根落煤管、二次风喷口、尿素喷枪和全尺寸锅炉进行了数值模拟。通过优化播煤风管封堵裕量改善了煤颗粒的抛洒均匀性和空气分级效果;通过新增二次风层及减小二次风喷口角度进一步降低了NO

排放量。全尺寸模拟结果显示

改造后的NO排放质量浓度由264 mg/m

降低至162 mg/m

降幅达到38.6%

并且燃烧中心上移

炉膛出口烟气温度升高;现场改造结果显示

机组在35%~100%锅炉负荷下均可在不对锅炉效率产生负面影响的基础上实现NO

超低排放

并且受益于炉膛出口烟气温度升高及喷枪改造

尿素耗量可节约40%以上。

Abstract

To solve the problem that it is difficult to achieve the ultra-low emission of NO

from circulating fluidized bed boiler under low load condition

method were proposed with adding an upper secondary air layer to realize air staging at first and then optimizing the coal sowing air

lower secondary air and ammonia spray grid structure. After which

above methods were implemented to a 350 MW unit. Numerical simulation were conducted on a single coal drop pipe

secondary air nozzle

urea guns and a full-size boiler by computational fluid dynamics and computationa

l particle fluid dynamics. The sowing uniformity of coal particles and the intensity of air staging are improved by optimizing the margin of coal sowing air. Meanwhile

by adding the secondary air layer and reducing the angle of secondary air nozzle

emission can be further reduced. Full-size simulation results show that the NO emission mass concentration decreases from 264 mg/m

to 162 mg/m

with a decrease of 38.6%

and with the moving up of flame center

the temperature of flue gas at furnace outlet increases. Field retrofit results show that the boiler can achieve NO

ultra-low emission under 35%-100% boiler load without a negative effect on boiler efficiency

while the urea consumption can be saved by more than 40% due to the increase of flue gas temperature at furnace outlet and the retrofit of urea guns.

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references

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Control of NOx Ultra-low Emission on Circulating Fluidized Bed Boiler Under Low Load Condition

DOI：10.19805/j.cnki.jcspe.2025.240487

摘要

Abstract

关键词

Keywords

references

Control of NO_x Ultra-low Emission on Circulating Fluidized Bed Boiler Under Low Load Condition