摘要
燃煤烟气中的大颗粒灰会造成选择性催化还原系统(SCR)催化剂的堵塞与磨损,影响SCR催化剂的使用寿命和脱硝性能。针对上述问题,阐述了大颗粒灰的性质及脱硝催化剂的堵塞、磨损机理。详细介绍了当前预防大颗粒灰影响的两类主要措施:流场改造和安装拦截网装置。流场改造措施捕集大颗粒灰,系统压降损失小,且后期维护工作少,但对电厂空间要求较高;安装拦截网较于流场改造方式更具普适性和推广的潜力,可作为当前防止大颗粒灰堵塞SCR催化剂的主要手段。设计出耐磨性更好、压降更小、不易堵塞且易清灰的拦截网装置是保障SCR系统长期稳定运行的研究重点。最后,例举了国内外机组大颗粒灰拦截网应用实例,为大颗粒灰拦截装置设计提供参考。
The large-particle ash in the flue gas of coal burning will cause the blockage and wear of selective catalytic reduction(SCR)catalyst,which affects the service life and denitration performance of SCR catalyst. In view of the above problems,this paper describes the properties of large-particle ash and the mechanism of blockage and wear of denitration catalyst,and then introduces in detail the two main measures of flow field modification and installation of interceptor net to prevent the influence of large-particle ash. Flow field modification measures capture large-particle ash;the system pressure drop loss is small,and the later maintenance work is less,but the power plant space requirements are high. Compared with the flow field modification method,the installation of interceptor net has more universality and popularization potential,and can be used as the main means to prevent the blockage of SCR catalyst by large-particle ash. To design the interceptor net device with better wear resistance,lower pressure drops,less blockage and easy dust removal is the research focus to ensure the long-term stable operation of SCR system. Finally,the paper presents the application examples of large-particle ash interceptor net at home and abroad,which provides reference for the design of large-particle ash interceptor devices.
作者
岳朴杰
雷彧
周晓辰
陈晟
刘小伟
孟磊
谷小兵
YUE Pujie;LEI Yu;ZHOU Xiaochen;CHEN Sheng;LIU Xiaowei;MENG Lei;GU Xiaobing(Datang Environment Industry Group Co.,Ltd.,Beijing 100097,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan Hubei 430074,China)
出处
《湖北电力》
2022年第3期7-15,共9页
Hubei Electric Power
基金
国家自然科学基金项目(项目编号:52006084)。
关键词
大颗粒灰
选择性催化还原
大颗粒灰拦截
CFD计算
磨损与堵塞
large-particle ash
selective catalytic reduction
large-particle ash interceptor
CFD simulation
blockage and wear
作者简介
岳朴杰(1988),男,河南开封人,博士研究生,研究方向为燃煤电厂环保新技术研究;通讯作者:陈晟(1992),男,浙江杭州人,博士,副研究员,研究方向为燃煤污染物生成与控制研究。
