文献类型：期刊文献

中文题名：热氧喷嘴水煤浆扩散火焰辐射光谱特性研究

英文题名：Experimental Study on the Characteristics of Chemiluminescence in Coal Water Slurry Diffusion Flames Based on Hot Oxygen Burner Technology

作者：胡翀赫[1];郭庆华[1];宋旭东[1];龚岩[1];于广锁[1]

机构：[1]华东理工大学煤气化及能源化工教育部重点实验室,上海200237

年份：2016

卷号：36

期号：10

起止页码：3127

中文期刊名：光谱学与光谱分析

外文期刊名：Spectroscopy and Spectral Analysis

收录：CSTPCD;;EI(收录号：20164202924732);Scopus;WOS:【SCI-EXPANDED(收录号:WOS:000385475500008)】；北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；PubMed;

基金：国家高技术研究发展计划(863计划)项目(2012AA053103);国家自然科学基金项目(51406056);中国博士后科学基金项目(2014M561425);中央高校基本科研业务费专项资金项目(222201414030)资助

语种：中文

中文关键词：光谱辐射;热氧喷嘴;水煤浆;甲烷;扩散火焰

外文关键词：Spectral radiation; Hot oxygen burner; Coal water slurry; Methane; Diffusion flame

摘要：火焰的辐射光谱可为燃烧诊断提供诸多信息,因此目前对简单的气态火焰自由基辐射特性已进行了大量研究,而关于非均相火焰的辐射光谱特性研究则相对较少。采用改进的热氧喷嘴技术在敞开空间下直接点燃水煤浆,并利用光纤光谱仪和紫外成像系统,着重对甲烷和水煤浆火焰的辐射光谱及OH*的二维分布特性进行研究。结果表明:与甲烷火焰的光谱辐射相比,水煤浆火焰不仅存在OH*,CH*和C2*特征辐射,还产生了Na*,Li*,K*和H*的发射谱线,并出现了连续的黑体辐射,这些光谱辐射特征可作为水煤浆气化或燃烧的标志,也可作为水煤浆是否点燃的判据;通入水煤浆后,OH*强度明显下降,而CH*和C2*强度增大。对比甲烷火焰OH*二维分布,水煤浆火焰OH*峰值强度明显下降,化学反应区域面积显著减小;沿着火焰传播方向,甲烷和水煤浆火焰轴向的OH*强度均呈先增大后减小的趋势;甲烷火焰径向的OH*在反应核心区出现了双峰形态分布,而水煤浆火焰OH*径向始终呈单峰分布。随着氧碳当量比增大,水煤浆火焰OH*的存在范围扩大,说明氧气的增加促进了OH*的产生;随水煤浆流量提高,OH*的反应核心区域缩小,峰值强度明显下降,CH*,C2*,Na*,Li*,K*和H*的强度显著增强,连续的黑体辐射强度也明显增大,这些辐射光谱的变化可用于表征操作负荷的变化。
Most published works focused on the characteristics of chemiluminescence in homogeneous flames,but the research about radiation spectrum in heterogeneous flames was still limited.In this paper,improved hot oxygen burner（HOB）technology is applied to ignite coal water slurry（CWS）directly in the open space,for stable combustion.Radiation spectrum and two-dimensional OH＊chemiluminescence in methane and CWS diffusion flames are measured by a fiber optic spectrometer and a highspatial-resolution UV imaging system.The results show that OH＊（309.12nm）,CH＊（431.42nm）and C＊2（463.52-563.43nm）radicals exist in both methane and CWS diffusion flame,but Na＊（589.45nm）,Li＊（670.88nm）,K＊（766.91,770.06nm）,H＊（816.04,819.99nm）radiation spectrum line and continuous black-body radiation have been detected only in the CWS flame.These differences can be used to characterize the combustion or gasification of CWS and distinguish whether CWS is ignited or not.In addition,the injection of CWS into methane flame leads to a significant reduction in OH＊and an increase in C＊2and CH＊radiation intensity.This is because a lot of heat is absorbed in the processes of CWS combustion reactions.Then the generation of CH is inhibited,and the production of OH＊is reduced.The increase of C＊2and CH＊is due to simple substance carbon produce more after injecting CWS.Besides,axial OH＊radiation intensity increases at first then decreases,and the position of peak intensity is closer to outlet of hot oxygen burner compared with methane flames.Radial OH＊radiation distribution is bimodal in methane flame because reactions take place in the thin layer where methane and oxygen meet.However,in CWS flame,radial OH＊radiation distribution is always unimodal since CWS diffuses fiercely and mixes with oxygen sufficiently.As the ratio of oxygen atom to carbon atom（[O/C]e）increases,the reaction region of OH＊radicals becomes larger in methane and CWS flame.This indicates that increasing oxygen can promote reactions and benefit OH＊radicals＇ generation.Moreover,with the increase of CWS flow,reaction center is closer to burner outlet,OH＊distribution range and peak intensity decrease obviously,CH＊,C＊2,Na＊,Li＊,K＊,H＊and black-body radiation intensities markedly rise.And these characteristics can reflect thechanges of operation loads.