旋流数对多通道旋流燃烧器燃烧特性的影响研究  

Research on the effect of swirl number on combustion characteristic of multi-channel swirl burner

作　　者：郑祥玉 ZHENG Xiangyu(Beijing Tiandi Integration&Innovation Technology Corporation Ltd.,Beijing 100013,China)

机构地区：[1]北京天地融创科技股份有限公司,北京100013

出　　处：《煤质技术》2025年第1期24-30,共7页Coal Quality Technology

基　　金：天地科技股份有限公司科技创新创业基金资助项目(2023RCCX-02)。

摘　　要：旋流燃烧器的运行工况调整为煤粉工业锅炉燃烧组织优化的研究重点,即多通道旋流燃烧器中旋流数对其燃烧特性的影响研究可为燃烧器实际运行工况调整以及全工况模拟研究提供理论分析和实际数据支撑。借助燃烧测试平台,采用探入式高温热电偶、烟气气体分析仪和工业高速摄像机3种测量技术分别对该旋流燃烧器预燃室结构内燃烧烟气的温度分布、气体各组分浓度分布及预燃室结构外形成的煤粉火焰进行测量,探究该燃烧器的煤粉组织燃烧过程及不同旋流数的影响。试验结果表明:预燃室内中心轴线区域形成高温低氧强还原性气氛区域,有利于煤粉燃烧初期的着火稳燃及抑制氮氧化物生成;预燃室内壁面处形成低温空气层,有利于该结构长期稳定运行;预燃室外稳定的火焰形态及较长的火焰行程有利于煤粉后续燃尽。在内二次风旋流数逐渐降低的过程中,高温区域温度峰值变化较小,低氧区域范围及还原性气氛强度逐渐减弱,火焰的长度均值降低、最大值和波动度增加,预燃室出口处发散角度和直径呈现先降低后增加的变化趋势。在内二次风旋流数为1.67的工况下,温度峰值及边壁温度变化幅度最小,低氧区域范围和还原性气氛强度较好,火焰行程较长且直径及发散角度适中,有利于保持煤粉燃烧初期的着火稳燃能力以及后续煤粉燃尽效果,同时抑制氮氧化物生成,为运行状况下的合理工况。The adjustment of the operating conditions of swirl burners has become the research focus of the combustion organization optimization for pulverized coal industrial boilers.That is to say,the research on the influence of the swirl number in multi-channel swirl burners on combustion characteristics can provide theoretical analysis and data support for the adjustment of the actual operating conditions of burners and the full-condition simulation research.With the help of the pulverized coal combustion test platform,three measurement techniques,namely the inserted high-temperature thermocouple,the flue gas analyzer and the industrial high-speed camera,are adopted to measure the temperature distribution of the combustion flue gas in the structure of the pre-combustion chamber of the swirl burner,the concentration distribution of each component in the gas and the pulverized coal flame formed outside the structure of the pre-combustion chamber respectively,so as to explore the pulverized coal organized combustion process of the burner and the influence of different swirl numbers.The experiment results show that:in the central axis area of the pre-combustion chamber,a high-temperature,low-oxygen,and strongly reducing atmosphere region is formed,which is conducive to the ignition and stable combustion of pulverized coal in the initial stage of combustion and the suppression of nitrogen oxide generation;a low-temperature air layer is formed on the inner wall surface of the pre-combustion chamber,which is beneficial to the long-term stable operation of this structure;the stable flame shape outside the pre-combustion chamber and the relatively long flame path are conducive to the subsequent burnout of pulverized coal.During the process in which the swirl number of the inner secondary air gradually decreases,the peak temperature in the high-temperature region changes slightly,the range of the low-oxygen region and the intensity of the reducing atmosphere gradually weaken,the average length of the flame decreases,while the ma

关 键 词：旋流燃烧器 旋流数 燃烧特性 煤粉工业锅炉 烟气温度 火焰形态 预燃室 温度峰值 

分 类 号：TK223.23[动力工程及工程热物理—动力机械及工程]