660 MW燃煤机组瞬态过程NOx生成及脱除特性

doi:10.12096/j.2096-4528.pgt.20038

发电技术 ›› 2020, Vol. 41 ›› Issue (5): 527-535.DOI: 10.12096/j.2096-4528.pgt.20038

• 厂界环保岛与数字孪生技术 • 上一篇下一篇

660 MW燃煤机组瞬态过程NO_x生成及脱除特性

范江¹(),张双平^1,²(),孟宇¹(),陈伟雄^1,*(),严俊杰¹()

¹ 西安交通大学能源与动力工程学院, 陕西省西安市 710049
² 大唐西北电力试验研究院, 陕西省西安市 710021

收稿日期:2020-06-09 出版日期:2020-10-30 发布日期:2020-11-02
通讯作者: 陈伟雄
作者简介:范江(1995),男,硕士研究生,主要从事热力系统优化相关研究, 1179988030@qq.com|张双平(1991),男,工程师,主要从事燃煤发电机组污染物生成及治理研究, 2309038586@qq.com|孟宇(1994),男,硕士研究生,主要从事热力系统相关数值模拟工作, 764527980@qq.com|严俊杰(1967),男,教授,博士生导师,主要从事热力系统节能控制与仿真、汽液两相流研究, yanjj@mail.xjtu.edu.cn
基金资助:
国家重点基础研究发展计划项目(2015CB251504)

Characteristics of NO_x Formation and Removal in the Transient Process of a 660 MW Coal-fired Power Unit

Jiang FAN¹(),Shuangping ZHANG^1,²(),Yu MENG¹(),Weixiong CHEN^1,*(),Junjie YAN¹()

¹ School of Energy and Power Engineering, Xi'an Jiaotong University, Xi'an 710049, Shaanxi Province, China
² Datang Northwest Electric Power Test & Research Institute, Xi'an 710021, Shaanxi Province, China

Received:2020-06-09 Published:2020-10-30 Online:2020-11-02
Contact: Weixiong CHEN
Supported by:
National Key Basic Research and Development Program of China(2015CB251504)

摘要/Abstract

摘要：

燃煤机组为完成电网负荷调峰任务，锅炉负荷长期频繁波动，对氮氧化物的生成及脱除效果有显著影响。以某660 MW燃煤机组瞬态过程氮氧化物的生成及脱除特性为研究目标，建立了机组瞬态过程氮氧化物生成预测模型，开展了变负荷过程中氮氧化物生成预测研究。针对燃煤机组变负荷过程燃烧器切换的特点，发现新增燃烧器的负荷点越高时，越能有效避免氮氧化物的生成值增大。另外，分析了选择性催化还原（selective catalytic reduction，SCR）动态特性，分别研究了SCR入口氮氧化物浓度、喷氨浓度、烟气流速和反应温度等阶跃变化对氮氧化物脱除的动态特性影响，为后续瞬态过程喷氨优化控制逻辑提供参考。

关键词: 燃煤机组, NO_x生成预测, 选择性催化还原(SCR)脱硝, 瞬态过程

Abstract:

In order to complete the peak load regulating of power system, coal-fired power units have long-term frequent load fluctuations, which have a significant impact on the formation and removal of nitrogen oxides. In this paper, with the goal of studying the characteristics of nitrogen oxide generation and removal in the transient process of a 660 MW coal-fired unit, a prediction model of nitrogen oxides generation in the transient process was established, and the nitrogen oxides generation prediction study in the process of variable load was carried out. According to the characteristics of the burner switching in the variable load process of the coal-fired unit, it was found that the higher load point of the newly added burner, the more effectively it can avoid the increase of the generation value of nitrogen oxides. In addition, the dynamic characteristics of selective catalytic reduction (SCR) were analyzed, and the effects of the step changes such as nitrogen oxide concentration, NH₃ injection concentration, flue gas flow rate and reaction temperature on the dynamic characteristics of nitrogen oxides removal were studied respectively, which provides a reference for the optimization control logic of NH₃ injection in the subsequent transient process.

Key words: coal-fired power units, NO_x generation forecast, selective catalytic reduction (SCR) denitration, transient process

中图分类号:

TK16

范江,张双平,孟宇,陈伟雄,严俊杰. 660 MW燃煤机组瞬态过程NO_x生成及脱除特性[J]. 发电技术, 2020, 41(5): 527-535.

Jiang FAN,Shuangping ZHANG,Yu MENG,Weixiong CHEN,Junjie YAN. Characteristics of NO_x Formation and Removal in the Transient Process of a 660 MW Coal-fired Power Unit[J]. Power Generation Technology, 2020, 41(5): 527-535.

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660 MW燃煤机组瞬态过程NO_x生成及脱除特性

Characteristics of NO_x Formation and Removal in the Transient Process of a 660 MW Coal-fired Power Unit

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660 MW燃煤机组瞬态过程NOx生成及脱除特性

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660 MW燃煤机组瞬态过程NO_x生成及脱除特性

Characteristics of NO_x Formation and Removal in the Transient Process of a 660 MW Coal-fired Power Unit