STUDY ON NUMERICAL SIMULATION OF DECREASING NO<sub>x</sub> EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA

ZHOU Jun-hu; HE Pei; WANG Zhi-hua; ZHOU Zhi-jun; YANG Wei-juan; LIU Jian-zhong; CENG Ke-faZhejiang University

doi:10.19666/j.rlfd.2008.04.004

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STUDY ON NUMERICAL SIMULATION OF DECREASING NO_x EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA

更新时间：2025-09-28

- STUDY ON NUMERICAL SIMULATION OF DECREASING NO_x EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA
- Thermal Power Generation Issue 4, Pages: 13-17(2008)
- 作者机构：
  
  1. 浙江大学
  2. 浙江大学
  3. 3:浙江大学
  4. 4:浙江大学
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.2008.04.004
  CLC： TK229.6
- Published：2008
- 稿件说明：
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ZHOU Jun-hu, HE Pei, WANG Zhi-hua, et al. STUDY ON NUMERICAL SIMULATION OF DECREASING NO_x EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA[J]. Thermal power generation, 2008, (4): 13-17.
DOI：

ZHOU Jun-hu, HE Pei, WANG Zhi-hua, et al. STUDY ON NUMERICAL SIMULATION OF DECREASING NO_x EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA[J]. Thermal power generation, 2008, (4): 13-17. DOI： 10.19666/j.rlfd.2008.04.004.

摘要

对一台220t/h四角切圆煤粉锅炉采用空气分级燃烧技术改造前后的锅炉燃烧工况进行了数值模拟。结果表明

与改造前相比

改造后炉膛实际切圆直径变小

在分离燃尽风(SOFA)下方的区域氧量较低

煤粉不完全燃烧产生较多的一氧化碳

形成还原性气氛。同时

温度也较低

有效地抑制了NOx的生成

NOx排放量由改造前的618mL/m3降为228mL/m3。炉内煤粉颗粒的运动有一定的随机性

总体上煤粉颗粒喷入高度越低

在炉内停留时间越长。

Abstract

The numerical simulation of combustion performance in the boiler before and after retrofit by adopting air for staged firing technology in one 220 t/h corner tangential firing pulverized coal boiler has been carried out. Results show that the practical diameter of tangential circle in the furnace after retrofit is smaller than that before retrofit

the oxygen cotent in the region below separating over-fired air (SOFA) is lower

and more carbon monoxide being produced from imperfect combustion of the pulverized coal

forming a reductive atmosphere. At the same time

the temperature is also lower

restraining effectively the formation of NOx

the NOx emission has been lowered from 610 mL/m3 before retrofit to 228 mL/m3. The movement of pulverized coal particles has certain randomness

in general

the lower height of injected pulverized coal particles

the longer retaining time of them in the furnace.

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STUDY ON NUMERICAL SIMULATION OF DECREASING NOx EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA

DOI：10.19666/j.rlfd.2008.04.004

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STUDY ON NUMERICAL SIMULATION OF DECREASING NO_x EMISSION THROUGH RETROFITTING CORNER TANGENTIAL FIRING PULVERIIED COAL BOILER WITH SOFA