660MW燃煤电厂SCR装置喷氨问题优化解决方法分析与实践  

Analysis and Practice of Optimization Solution Method for SCR Ammonia Injection Problem in 660 MW Coal-Fired Power Plant

作　　者：林强 蒋志浩 张富祥 LIN Qiang;JIANG Zhihao;ZHANG Fuxiang(Shanghai Power Equipment Research Institute Co.,Ltd.,Shanghai 200240,China)

机构地区：[1]上海发电设备成套设计研究院有限责任公司,上海200240

出　　处：《锅炉技术》2025年第2期71-76,共6页Boiler Technology

摘　　要：燃煤电厂脱硝系统氨逃逸浓度高与喷氨匹配性差有关,喷氨匹配性又受脱硝系统入口的烟气流速分布、烟温偏差、氨氮摩尔比分布、催化剂性能和喷氨流量控制逻辑方式等因素的影响。分析了影响喷氨匹配性的因素,并针对某氨逃逸高的脱硝系统,介绍了喷氨支阀开度优化思路并进行了实践,提高了该喷氨系统的喷氨匹配性。在兼顾考虑高中低负荷喷氨支阀开度适应性前提下,实施了喷氨支阀开度优化调整,经实测验证,各负荷的平均氨逃逸率降低至保证值3μL/L以下,氨的有效利用率得以提高,为同类机组实施喷氨支阀开度优化提供了良好的实践经验。The high ammonia escape concentration in the denitration system of coal-fired power plants is related to the poor matching of ammonia injection.The matching of ammonia injection is also affected by factors such as the distribution of flue gas flow rate at the inlet of the denitration system,flue gas temperature deviation,ammonia nitrogen molar ratio distribution,catalyst performance,and the logic mode of ammonia injection flow control.This article first analyzes the factors that affect the matching of ammonia injection,and focuses on a denitration system with high ammonia escape.The optimization idea for the opening of the ammonia injection branch valve was introduced and practical measures were taken to improve the ammonia injection adaptability of the ammonia injection system.Under the premise of considering the adaptability of the opening of the ammonia injection branch valve for high,medium,and low loads,optimization and adjustment of the opening of the ammonia injection branch valve were implemented.After actualmeasurement and verification,the average ammonia escape concentration of each load was reduced to the guaranteed value of below 3μL/L,the effective utilization rate of ammonia is improved,providing good practical experience for optimizing the opening of ammonia injection branch valves in similar units.

关 键 词：燃煤电厂 SCR喷氨匹配性 喷氨优化 氨逃逸 

分 类 号：X773[环境科学与工程—环境工程]