O_(2)/CO_(2)和O_(2)/N_(2)气氛下单颗粒煤火焰碱金属光谱辐射特性  

Alkali Metal Spectral Radiation Characteristics of Single Coal Particle Flames During the O_(2)/CO_(2)and O_(2)/N_(2)Atmospheres

作　　者：谢非 李金云 宋旭东 白永辉 王焦飞 苏暐光[1] 吕鹏 于广锁[2] XIE Fei;LI Jinyun;SONG Xudong;BAI Yonghui;WANG Jiaofei;SU Weiguang;LYU Peng;YU Guangsuo(State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering(College of Chemistry and Chemical Engineering,Ningxia University),Yinchuan 750021,Ningxia Hui Autonomous Region,China;Institute of Clean Coal Technology,East China University of Science and Technology,Xuhui District,Shanghai 200237,China)

机构地区：[1]省部共建煤炭高效利用与绿色化工国家重点实验室(宁夏大学化学化工学院),宁夏回族自治区银川市750021 [2]华东理工大学洁净煤技术研究所,上海市徐汇区200237

出　　处：《中国电机工程学报》2023年第8期3100-3108,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(22108132);宁夏重点研发计划项目(2019BCH01001,2019BEB04030,2019BEB04037)。

摘　　要：不同气氛条件对煤颗粒反应特性有着很大的影响,因此本文研究了O_(2)/CO_(2)和O_(2)/N_(2)气氛对单颗粒煤燃烧过程火焰面积、火焰温度及碱金属(Na^(*)和K^(*))光谱辐射特性的影响。基于煤颗粒可视化滴管炉,结合火焰光谱诊断系统,捕捉了火焰图像并采用多波段辐射法计算不同氧浓度为30%、40%和50%下的火焰温度。结果表明,随着反应的进行,火焰温度增加而火焰面积先增加后减小。O_(2)/CO_(2)气氛下,煤颗粒周围出现一层薄薄的“火焰层”,而在O_(2)/N_(2)气氛下没有观察到类似的现象,这源于CO_(2)较高的热容值。随着氧浓度的增加,火焰中Na^(*)和K^(*)的辐射峰值强度增加。另外,O_(2)/N_(2)气氛下Na^(*)和K^(*)峰值强度和火焰温度高于O_(2)/CO_(2)气氛,且Na^(*)和K^(*)峰值强度的与火焰温度呈正相关,可以用碱金属原子辐射光谱来表征火焰温度。The different atmosphere conditions have a great influence on the reaction characteristics of coal particles.Therefore,in this paper the effects of O_(2)/CO_(2)and O_(2)/N_(2)on flame size,flame temperature and spectral radiation characteristics of alkali metals(Na and K)during the combustion of single coal particle is investigated.A visual drop tube furnace combined with flame spectral diagnostic system is employed to capture the flame images and the flame temperature is calculated by the multi-wavelength radiation method at the at oxygen concentrations of 30%,40%and 50%,respectively.The results indicate that as the reaction proceeds,the flame temperature increases monotonously and the flame size first increases and then decreases.In the O_(2)/CO_(2)atmosphere,a thin"flame layer"appears around the single particle flame because of a higher heat capacity of CO2,while no similar phenomenon is observed in the O_(2)/N_(2)atmosphere.With the increase of oxygen concentration,the peak intensities of Na^(*) and K^(*) increase in the single coal particle flame.In addition,the peak intensities of Na^(*) and K^(*) and flame temperature in O_(2)/N_(2)atmosphere are higher than those in O_(2)/CO_(2)atmosphere,and the peak intensities of Na^(*) and K^(*) are positively correlated with flame temperature;thus the flame temperature can be characterized by alkali metal atomic radiation spectrum.

关 键 词：单颗粒煤火焰 火焰温度 O_(2)/N_(2)和O_(2)/CO_(2)气氛 Na^(*)和K^(*) 光谱诊断 

分 类 号：TK43[动力工程及工程热物理—动力机械及工程]