Low NOxcombustion control mechanism of down-fired boilers

YAN Wanjun; CAO Liang; FANG Fan; ZHOU Hongguang; WEI Tongsheng; XU Dangqi; NIE Jianping

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Low NOxcombustion control mechanism of down-fired boilers

更新时间：2025-09-28

- Low NOxcombustion control mechanism of down-fired boilers
- Thermal Power Generation Vol. 43, Issue 12, Pages: 61-65(2014)
- 作者机构：
  
  1. 西安热工研究院有限公司
  2. 华能平凉发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK224.11
- Published：2014
- 稿件说明：
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YAN Wanjun, CAO Liang, FANG Fan, et al. Low NOxcombustion control mechanism of down-fired boilers[J]. Thermal power generation, 2014, 43(12): 61-65.
DOI：

YAN Wanjun, CAO Liang, FANG Fan, et al. Low NOxcombustion control mechanism of down-fired boilers[J]. Thermal power generation, 2014, 43(12): 61-65. DOI：

摘要

针对FW技术W火焰锅炉存在的NOx排放量高的问题

分析了其炉内燃烧及NOx生成特性

提出了引射回流、多点分级的低氮燃烧控制机理

并基于该控制机理对某台660MW机组FW技术W火焰锅炉进行了低氮燃烧改造。改造后测试结果表明

对于W火焰锅炉

仅通过增设OFA系统

并不能使NOx排放量大幅降低

应同时将拱下二次风移至拱上合适位置送入炉膛

在全炉膛实现引射回流、多点分级的低氮燃烧方式

可将NOx排放量降至理想水平。

Abstract

To solve high nitrogen oxide(NOx)emission problem occurred in Foster Wheeler down-fired boilers

the combustion characteristics and NOxformation properties in the furnace were analyzed.The low NOxcombustion control mechanism applying the "injection-reflux and multipoint-multistage"mechanism was developed.On the basis of this mechanism

the low NOxcombustion retrofitting was carried out on a660 MW unit boiler applying the Foster Wheeler technique.The experimental results after retrofitting indicate that the NOxemissions can not be reduced significantly by simply adding OFA system in down-fired boilers.The secondary air should be shifted from the rear and front wall to the right place of arches to realize the "injection-reflux and multipoint-multistage" mechanism in the whole furnace.Thus the ideal NOxemissions level(≤800mg/m3)can be reached.

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