Experimental study on improving the adaptability of SCR flue gas denitrification equipment for opposite wall fired furnace

XIE Xinhua; HE Jinliang; ZHAO Ningbo; SONG Yubao; LU Chengzheng; WAN Liming; CHANG Xubing

doi:10.19666/j.rlfd.202003147

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Experimental study on improving the adaptability of SCR flue gas denitrification equipment for opposite wall fired furnace

更新时间：2025-09-28

- Experimental study on improving the adaptability of SCR flue gas denitrification equipment for opposite wall fired furnace
- Thermal Power Generation Vol. 49, Issue 11, Pages: 75-81(2020)
- 作者机构：
  
  1. 苏州西热节能环保技术有限公司
  2. 西安热工研究院有限公司
  3. 广州市黄埔区燃气管理所
  4. 广东粤电靖海发电有限责任公司
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.202003147
  CLC： X701
- Published Online：03 November 2020，
  
  Published：2020
- 稿件说明：
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XIE Xinhua, HE Jinliang, ZHAO Ningbo, et al. Experimental study on improving the adaptability of SCR flue gas denitrification equipment for opposite wall fired furnace[J]. Thermal power generation, 2020, 49(11): 75-81.
DOI：

XIE Xinhua, HE Jinliang, ZHAO Ningbo, et al. Experimental study on improving the adaptability of SCR flue gas denitrification equipment for opposite wall fired furnace[J]. Thermal power generation, 2020, 49(11): 75-81. DOI： 10.19666/j.rlfd.202003147.

摘要

燃煤机组墙式燃烧锅炉省煤器出口烟气的速度和NO_x质量浓度分布随机组负荷、磨煤机组合方式变化较大

导致选择性催化还原(SCR)烟气脱硝装置的工况适应性差

空气预热器硫酸氢铵堵塞加重

常规喷氨优化调整难以适应全负荷运行。为此

本文提出了高中低负荷5个磨煤机组合下的喷氨综合平衡调整试验方法

并以某600 MW机组墙式对冲燃烧锅炉为研究对象

进行了SCR喷氨优化调整试验研究。结果表明:在5个常规运行磨煤机组合下

SCR烟气脱硝装置出口截面NO_x质量浓度分布的相对标准偏差CV值分别达到了31%、31%、27%、26%、32%

工况适应性良好;DCS历史数据显示运行14个月后

机组满负荷下的空气预热器烟气侧差压增长甚微。

Abstract

The distributions of gas velocity and NO_x mass concentration at the economizer outlet vary greatly with the unit load and coal mill combination in opposite wall fired furnace. Consequently

the adaptability of the selective catalytic reduction(SCR) denitration device is poor

and the blockage of ammonium hydrogen sulfate in the air preheater is aggravated. Conventional ammonia injection grid(AIG) optimization can not achieve good adaptability to full load operation. To solve this problem

a comprehensive balance adjustment test method was proposed by taking into account 5 operation combinations of 6 coal mills at different unit loads. Moreover

the AIG optimization was studied on a 600 MW unit using this comprehensive balance adjustment test method. The test results showed that

under the 5 conventional running mill combinations

the relative standard deviation CV values of the NO_x mass concentration distribution at the outlet cross section of the SCR flue gas denitration device reached 31%

31%

27%

26% and 32%

respectively. The historical data of DCS showed that

after 14 months operation

the differential pressure of the air preheater at full load has basically not increased.

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