660 MW燃煤机组脱硝系统优化改造
张起¹，张福祥²，李盛平²，景浩林²，杨锐涵²，董志强³，杨祖旺³，田桦³
（1. 国家电投集团电站运营技术（北京）有限公司，北京 100000；2. 青海黄河上游水电开发有限责任公司西宁发电分公司，
青海 西宁 810000；3. 西安格瑞电力科技有限公司，陕西 西安710000）
摘要： 脱硝系统烟气流场分布特性与氨烟混合特性直接影响脱硝效率和氨逃逸。一660 MW 机组原有脱硝系统存在催
化剂入口烟气流速分布不均、喷氨母管氨空混合性差、喷氨格栅后氨烟混合性差、喷氨量控制不够精细等问题。基于数
值模拟结果，提出了脱硝系统内安装导流元件、喷氨母管内加装氨空混合器、喷氨格栅后加装氨烟混合器、喷氨格栅实
施分区控制的优化改造方案。改造后的现场实验结果表明，脱硝系统优化后，催化剂入口烟气流速分布、烟温分布的均
匀性均较好，催化剂进出口NOx的质量浓度分布偏差均较小，660 MW 负荷下喷氨量比改造前下降34.5%。
关键词： 燃煤机组；脱硝改造；流场分布；均匀性
中图分类号： X701.7 文献标志码： A 文章编号： 2095-0802-(2023)02-0099-06
Optimization of Denitrification System for a 660 MW Coal-fired Unit
ZHANG Qi¹, ZHANG Fuxiang², LI Shengping², JING Haolin², YANG Ruihan², DONG Zhiqiang³,
YANG Zuwang³, TIAN Hua³
(1. Power Station Operation Technology (Beijing) Co., Ltd., State Power Investment Corporation, Beijing 100000, China;
2. Xining Power Generation Branch Company, Qinghai Yellow River Upstream Hydropower Development Co., Ltd.,
Xining 810000, Qinghai, China; 3. Xi'an Green Power Technology Co., Ltd., Xi'an 710000, Shaanxi, China)
Abstract: The flow field of the flue gas and the mixing of ammonia with the flue gas affect the efficiency of denitrification and
ammonia escape. The denitrification system of a 660 MW unit met some problems, including the velocity distribution of the flue
gas was ununiform, the mixing of air and ammonia in the main pipe was poor, the mixing of flue gas and ammonia was poor in the
downstream of the injection grid, the control of ammonia injection was not precise enough, etc. Based on the results of the
numerical simulation, this paper proposed to install flow controlling device, mixer of air and ammonia, mixer of flue gas and
ammonia, sub-regional controller to improve the performance of the denitrification system. The experimental results after the
optimization showed that the distribution of the velocity and temperature field of the flue gas at the inlet of the catalyst was
improved, the uniformity of NOx mass concentration distribution at the inlet of the catalyst was decreased, and under 660 MW load
condition, the quantity of ammonia used for the denitrification system was decreased by 34.5%.

Key words: coal-fired units; denitration transformation; flow field distribution; uniformity