分区分级双P型辐射管喷口结构位置特性.pdfVIP

鄄鄄 工程科学学报,第39卷,第5期:756 761,2017年5月 鄄鄄 ChineseJournal of Engineering,Vol.39,No.5:756 761,May2017 鄄鄄 DOI:10.13374/ j.issn2095 9389.2017.05.014;http:/ / 分区分级双P型辐射管喷口结构位置特性 苣 徐摇 钱,冯俊小 ,周闻华,陈艳梅 北京科技大学能源与环境学院,北京 100083 苣 通信作者,E鄄mail:450554190@ 摘摇 要摇 为了对分区分级双P型燃气辐射管喷口结构、位置进行优化,提高燃烧效率. 首先对分区分级双P型燃气辐射管进 行了实验和数值研究,结果发现,除NO 体积分数的误差为11郾6%外,其他参数的偏差都在1%以内,证明该模型具有可靠性.x 在此基础上,通过研究主管和支管的喷口位置及喷口结构等参数,进行了气体温度和壁面温度的研究分析. 结果显示:随着 主管喷口位置向外移动,分区分级燃气辐射管表面温度的最高值逐渐减小,壁面温度的最低值逐渐增大. 支管喷口位于三通 管与支管交线处时,可以减少高温气体对辐射管管壁的冲击作用,提高支管径向的温度均匀性,延长辐射管使用寿命;主管喷 口的形式为完全预混式喷口时,壁面温差最小;支管喷口的形式为不对称式时,分区分级燃气辐射管壁面温差最小,燃烧热效 率最高. 关键词摇 辐射管;喷嘴;空燃比;结构;氮氧化物控制 分类号摇 TF062 Location characteristics of the nozzle structure in the double P鄄type radiant tube 苣 XUQian,FENGJun鄄xiao ,ZHOU Wen鄄hua,CHEN Yan鄄mei School of Energy and Environmental Engineering,University of Science and Technology Beijing,Beijing 100083,China 苣 Corresponding author,E鄄mail:450554190@ ABSTRACT摇 Tooptimizecombustionefficiency,thestructuralcharacteristicsofthezonedandstageddoubleP鄄typegas鄄firedradiant tubewere improved. The corresponding experimental and numerical studies were performed on the new radiant tube and the results show that deviations inthemonitoringparametersarelessthan 1%,exceptforaNO concentrationof 11郾6%,whichprovestherelia鄄x bility of themodel. Onthisbasis,thegasandwalltemperatureswerecomparedby changingthenozzlepositionandstructureparame鄄 tersof mainandbranchpipes. Theresultsshowthatasthenozzlepositionmovesoutward,thehighestvalueofthesurfacetemperature of the radiant tube gradually decreases and the minimum value of the wall temperature gradually increases. When the nozzle of the branchpipelocatesattheintersectionoftheteeandbranchpipes,ithelpstoreducetheimpactofthehightemperaturegasonthepipe wall,improve the uniformity of the branch radia