湍流旋流氨气-甲烷预混火焰燃烧特性研究
Study on Combustion Characteristics of Turbulent Rotating Ammonia-Methane Premixed Flame
刘文锋 1帅瑞洋 1王平 2钱伟佳 1王永倩 1杨证淳 1张泽雨 1Antonio Ferrante3
作者信息
- 1. 江苏大学能源研究院,镇江 212013
- 2. 江苏大学能源研究院,镇江 212013;浙江大学能源清洁利用国家重点实验室,杭州 310027
- 3. 江苏大学能源研究院,镇江 212013;能源与环境中心,Gioia del Colle(BA),意大利米兰70023
- 折叠
摘要
为了研究NH3-CH4掺混燃气的燃烧特性,设计了一个可视化的旋流湍流燃烧装置,通过实验对当量比(φ)、氨气掺混比(XNH3)和入口空气流量对燃烧特性的影响进行分析.结果表明:随着当量比增加,燃烧室出口 NO排放先增加后减小,在φ=0.9时达到峰值,对其反应速率和燃烧光谱进行分析,发现NO2和HNO浓度协同影响了 NO的反应速率,NO排放和OH基强度呈正相关,NH2α基和H2O蒸气产生的链式反应促进了 NO的还原.随着XNH3升高,火焰由蓝色逐渐转变为橙黄色,NO排放先增加后减少,在XNH3=0.4附近出现峰值.另外,随着入口空气流量的增加,气流速度增大导致湍流强度增大,贫燃状态下NO排放增加,而在富燃状态下排放减少,文中对其中机理进行了分析.
Abstract
A visualized turbulent swirling combustion device was designed to investigate the com-bustion characteristics of NH3-CH4 mixture.The experiments focused on analyzing the impact of equivalence ratio,ammonia mixing ratio(XNH3),and inlet air flow rate on the combustion pro-cess.The results indicated that as the equivalence ratio increased,nitrogen oxide(NO)emissions at the combustion chamber outlet first increased and then decreased,reaching a peak at φ=0.9.Analysis of the combustion spectrum revealed that a positive correlation between NO emissions and OH radical intensity.Chain reactions generated by NH2α radicals and water vapor promote the reduction of NO.Moreover,as XNH3 increased,the flame transitioned from blue to orange-yellow,with NO emissions showing a similar trend of first increasing and then decreasing,peaking around XNH3=0.4.Furthermore,NO emission was found to increase with inlet air flow rate during lean com-bustion but decrease it during rich combustion.The underlying mechanism for this phenomenon is analyzed.
关键词
氨气燃烧/旋流湍流火焰/一氧化氮排放/实验测量/燃烧特性Key words
ammonia combustion/turbulent swirling flame/nitric oxide emission/experimental measurement/combustion characteristics引用本文复制引用
基金项目
国家自然科学基金(91741117)
浙江大学能源清洁利用国家重点实验室开放基金(ZJUCEU2022020)
出版年
2024
NETL
NSTL
万方数据