摘要
循环流化床(CFB)由于煤种适应性好、负荷调节能力强、污染物排放低等优点近些年获得越来越广泛的应用,然而N2O排放浓度较高成为制约循环流化床应用的一大因素,因此对N2O的生成机理以及影响因素进行调研、总结N2O的减排措施是十分必要的。本文探讨了在循环流化床燃煤中N2O的生成机理,并对煤的各项性质、床温、过量空气系数等影响N2O排放的因素进行分析,从各类影响因素出发对现有的N2O减排技术进行归纳总结,最后对反向分级、混燃生物质及CFB解耦燃烧技术进行了前景展望。
Circulating fluidized beds(CFB)have been widely used in recent years due to their good fuel adaptability,strong load regulation ability and low pollutant emissions.However,high N2O concentrations have become a major factor restricting CFB applications.Therefore,the N2O formation mechanism needs to be further studied to identify factors affecting the N2O production and measures to reduce the N2O emissions.This study analyzes the N2O formation mechanisms for coal combustion in a CFB for various coal properties,bed temperatures and excess air rates.N2O emission control technologies are then evaluated for various key factors.Finally,this study analyzes the prospects of reversed air staging,co-combustion of coal and biomass and CFB combustion decoupling methodologies.
作者
苗苗
张缦
吕俊复
杨海瑞
张凯
MIAO Miao;ZHANG Man;Lü Junfu;YANG Hairui;ZHANG Kai(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,State Key Laboratory of Control and Simulation of Power System and Generation Equipment,Department of Energy and Power Engineering,Tsinghua University,Beijing 100084,China;Taiyuan Boiler Group Co.,Ltd.,Taiyuan 030008,China)
出处
《清华大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2020年第6期507-517,共11页
Journal of Tsinghua University(Science and Technology)
基金
国家自然科学联合基金项目(U1810126)。
关键词
N2O
循环流化床(CFB)
生成机理
减排
N2O
circulating fluidized bed(CFB)
formation mechanism
emission reduction
