摘要
预热燃烧是气化飞灰资源化处置的有效途径,通常搭配主燃室空气分级以协同实现高效清洁燃烧,因此,研究高温预热燃料的贫氧燃烧火焰特性非常有必要。搭建了250 kW高温预热燃料火焰特性试验平台,通过高温火焰可视化监测及其图像编程处理,研究了主燃室二次风倾斜角度对气化飞灰预热燃烧的贫氧火焰特性的影响规律。试验表明,随着二次风倾斜角度从30°增大到60°,贫氧燃烧火焰逐渐远离热烧嘴出口,脱火距离无量纲值从1.04增大到3.73,火焰宽度无量纲值则从4.09逐渐减小至3.47。当主燃室二次风倾斜角度为30°和45°时,燃烧系统的碳转化率分别为71.6%和70.3%。综合考虑二次风倾斜角度对热烧嘴运行稳定和气化飞灰燃尽的影响,主燃室二次风倾斜角度的优选值为45°。
Preheated combustion is an effective way for the resource disposal of gasification fly ash.It is usually combined with airstaged main chamber to achieve efficient and clean combustion.Therefore,the oxygen-lean combustion flame characteristics of high temperature preheated fuel is crucial.In this paper,a 250 kW combustion flame test platform was built.Through high-temperature flame visual monitoring and image programming treatment,the effect of the secondary air inclination angle of the main chamber on the oxygen-lean flame characteristics of gasification fly ash preheating combustion was studied.The experimental results show that as the secondary air inclination angle increases from 30°to 60°,the oxygen-lean combustion flame gradually moves away from the burner outlet.Meanwhile,the dimensionless value of the lift-off distance increases from 1.04 to 3.73,and the dimensionless value of the flame width gradually decreases from 4.09 to 3.47.When the secondary air inclination angle in the main chamber is 30°and 45°,the carbon conversion rate of the combustion system is 71.6%and 70.3%,respectively.Considering the impact of the secondary air inclination angle on the operation stability of the burner and burnout of the gasification fly ash,an optimal secondary air inclination angle of 45°is recommended.
作者
方能
卢玉
张博文
梁晨
李伟
任强强
FANG Neng;LU Yu;ZHANG Bowen;LIANG Chen;LI Wei;REN Qiangqiang(State Key Laboratory of Coal Conversion,Institute of Engineering Thermophysics,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China;Shanxi Key Laboratory of Coal Flexible Combustionand Thermal Conversion,Datong Institute of Coal Clean and Efficient Utilization,Datong 037000,China)
出处
《洁净煤技术》
CAS
CSCD
北大核心
2024年第S01期191-197,共7页
Clean Coal Technology
基金
中国科学院A类战略性先导科技专项资助项目(XDA29020300,XDA29030100)
关键词
气化飞灰
预热燃烧
贫氧燃烧
二次风倾斜角
火焰特性
gasification fly ash
preheated combustion
oxygen-lean combustion
secondary air inclination angle
flame characteristics
作者简介
方能(1990—),男,湖北应城人,助理研究员,博士。E-mail:fangneng@iet.cn;通讯作者:李伟(1988—),男,江西宁都人,副研究员,博士。E-mail:liwei10@iet.cn
