Experimental study on aerodynamic field and combustion operation of a 600 MW opposed-firing coal boiler with closing-to-wall air

PENG Zonggui; DU Zhihua; LIAN Lingxian; SU Fangwei; LIU Yongsheng; MENG Xinyu; SHAN Hengjie; GUO Wenhai; REN Chongyu; PENG Longfei; SUN Jun; ZHANG Xilai; YAO Wei; YANG Zhongcan

doi:10.19666/j.rlfd.202203067

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Experimental study on aerodynamic field and combustion operation of a 600 MW opposed-firing coal boiler with closing-to-wall air

更新时间：2025-09-28

- Experimental study on aerodynamic field and combustion operation of a 600 MW opposed-firing coal boiler with closing-to-wall air
- Thermal Power Generation Vol. 51, Issue 9, Pages: 132-140(2022)
- 作者机构：
  
  1. 华能沁北发电有限责任公司
  2. 西安热工研究院有限公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202203067
  CLC： TM621.2
- Published：2022
- 稿件说明：
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PENG Zonggui, DU Zhihua, LIAN Lingxian, et al. Experimental study on aerodynamic field and combustion operation of a 600 MW opposed-firing coal boiler with closing-to-wall air[J]. Thermal power generation, 2022, 51(9): 132-140.
DOI：

PENG Zonggui, DU Zhihua, LIAN Lingxian, et al. Experimental study on aerodynamic field and combustion operation of a 600 MW opposed-firing coal boiler with closing-to-wall air[J]. Thermal power generation, 2022, 51(9): 132-140. DOI： 10.19666/j.rlfd.202203067.

摘要

贴壁风技术是缓解燃煤锅炉水冷壁高温结渣和腐蚀问题的有效措施

其原理是通过水冷壁上的空气喷口向结渣腐蚀严重区域通入贴壁风

以达到降低壁面温度、改善还原气氛的目的。在某超临界600 MW机组配套的对冲燃烧锅炉前后墙水冷壁上加装了3层贴壁风喷口

并开展了贴壁风空气动力场冷态工业试验和热态燃烧运行试验。结果表明:贴壁风气流可覆盖至侧墙中部位置

能够实现对炉膛易腐蚀区域的良好覆盖和吹扫;锅炉负荷为600、450、300 MW的工况下

贴壁风投运后水冷壁的贴壁O_2体积分数较投运前平均提高至3.0%以上

贴壁H_2S体积分数平均降低80%以上

且均在200×10~(–6)以下。水冷壁的高温腐蚀问题可以得到有效防控。

Abstract

Closing-to-wall air protection is an effective measure to prevent high-temperature slagging and corrosion of waterwalls of coal-fired boilers. The mechanism is to lower the wall temperature and mitigate the reducing atmosphere by introducing closing-to-wall air to the areas with high slagging and corrosion risks through the air nozzles on the waterwall. In this project

three layers of closing-to-wall air nozzles were installed on the front/rear wall of the opposed-firing boiler of a supercritical 600 MW unit. Subsequently

cold-state industrial test of the closing-to-wall air aerodynamic field and hot-state combustion operation tests were conducted. The results show that

the closing-to-wall airflow could reach the middle of the sidewall and achieve good coverage and purging on the corrosion-prone area in the furnace. At 600 MW

450 MW and 300 MW

after the closing-to-wall air system was put into operation

the average volume fraction of near-wall O_2 increased to over 3.0%

and that of near-wall H_2S reduced to lower than 200×10~(–6)

by more than 80%. The high-temperature slagging and corrosion of the waterwall could be effectively alleviated.

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