SCR脱硝低负荷投运烟气调温旁路改造设计

doi:10.11930/j.issn.1004-9649.201903067

中国电力 ›› 2019, Vol. 52 ›› Issue (9): 179-184.DOI: 10.11930/j.issn.1004-9649.201903067

• 节能与环保 • 上一篇

SCR脱硝低负荷投运烟气调温旁路改造设计

雷嗣远¹, 李海浩², 李乐田¹, 倪贵东³, 孔凡海¹, 吴国勋¹, 卞子君¹

1. 西安热工研究院有限公司苏州分公司, 江苏苏州 215153;
2. 华能铜川照金煤电有限公司, 陕西铜川 727199;
3. 华能嘉祥发电有限公司, 山东济宁 272000

收稿日期:2019-03-20 修回日期:2019-04-16 出版日期:2019-09-05 发布日期:2019-09-19
作者简介:雷嗣远(1984-),男,硕士,工程师,从事火电厂SCR脱硝运行诊断及催化剂寿命管理技术研究,E-mail:leisiyuan7@163.com
基金资助:
苏州市重点产业技术创新项目（燃煤机组硫酸氢铵堵塞协同防治技术的研发及产业化，SGC201704）。

Design for Modification of Flue Gas Temperature Adjustment Bypass for SCR Denitrification System under Low Load Operation Conditions

LEI Siyuan¹, LI Haihao², LI Letian¹, NI Guidong³, KONG Fanhai¹, WU Guoxun¹, BIAN Zijun¹

1. Xi'an Thermal Power Research Institute Co., Ltd. Suzhou Branch, Suzhou 215153, China;
2. Huaneng Tongchuan Zhaojin Coal and Electricity Co., Ltd., Tongchuan 727199, China;
3. Huaneng Jiaxiang Power Generation Co., Ltd., Jining 272000, China

Received:2019-03-20 Revised:2019-04-16 Online:2019-09-05 Published:2019-09-19
Supported by:
This work is supported by Suzhou Technology Innovation Projects of Major Industries (No.SGC201704).

摘要/Abstract

摘要： 燃煤电厂低负荷运行时SCR脱硝装置入口烟温常达不到要求，某些电厂采用旁路提温方法予以解决，却出现调温旁路提温效果欠佳和烟温偏差较大的问题。以A电厂某 330 MW 机组为例，在现场勘察基础上采用数值模拟方法，找出问题所在：（1）旁路烟道结构不合理，未考虑原烟道结构缺陷；（2）旁路烟道未设置导流元件；（3）旁路接入位置不合理；（4）旁路接入烟道深度不足。在总结脱硝调温旁路烟道设计和运行要点基础上，采用数值模拟手段对B电厂某 330 MW 机组类似改造进行了优化设计，并开展现场试验，对烟气提温效果进行评估。结果表明：B电厂烟气旁路提温改造效果显著且烟温偏差较小。

关键词: 燃煤电厂, SCR脱硝系统, 低负荷投运, 烟气调温旁路改造, 数值模拟优化设计

Abstract: The inlet flue gas temperature of SCR denitrification unit in the coal-fired power plant usually does not meet the requirement at low load. In some power plants the bypass heating method is applied, however, it is not effective to raise the flue gas temperature as expected and the problem of large deviation of flue gas temperature still exists. Taking a 300 MW unit in Power Plant A as an example, based on the field investigation, the problems are analyzed and diagnosed by numerical simulation as follows:(1) unreasonable structure of bypass flue due to the original structural defects; (2) lack of diversion elements installed in bypass flue duct; (3) unreasonable location of bypass access; (4) insufficient depth of bypass access. Therefore, on the basis of summarizing the highlights of design and operation of by-pass flue for denitrification and temperature regulation, the design of a 330 MW unit in Power Plant B is optimized by means of numerical simulation, and then the field tests are carried out to evaluate the effects of flue gas heating. The results demonstrate remarkable effectiveness of the retrofit project on flue gas bypass heating in Power Plant B with minor deviation of flue gas temperature.

Key words: coal-fired power plants, SCR denitrification system, low load operation, modification of flue gas temperature adjustment bypass, numerical simulation optimization design

中图分类号:

TM621.9
X701

雷嗣远, 李海浩, 李乐田, 倪贵东, 孔凡海, 吴国勋, 卞子君. SCR脱硝低负荷投运烟气调温旁路改造设计[J]. 中国电力, 2019, 52(9): 179-184.

LEI Siyuan, LI Haihao, LI Letian, NI Guidong, KONG Fanhai, WU Guoxun, BIAN Zijun. Design for Modification of Flue Gas Temperature Adjustment Bypass for SCR Denitrification System under Low Load Operation Conditions[J]. Electric Power, 2019, 52(9): 179-184.

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https://www.electricpower.com.cn/CN/Y2019/V52/I9/179

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SCR脱硝低负荷投运烟气调温旁路改造设计

Design for Modification of Flue Gas Temperature Adjustment Bypass for SCR Denitrification System under Low Load Operation Conditions

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SCR脱硝低负荷投运烟气调温旁路改造设计

Design for Modification of Flue Gas Temperature Adjustment Bypass for SCR Denitrification System under Low Load Operation Conditions

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