粒子浓度对富氧气氛下炉膛内烟气黑度计算的影响  

The Effect of Particle Concentration on The Calculation of Flue Gas Emissivity in Oxy-coal Combustion Boiler

作　　者：刘勇 杜军 聂宇宏 LIU Yong;DU Jun;NIE Yu-hong(School of Ship and Marine Engineering,Guangzhou Maritime University,Guangzhou Guangdong 510725,China;School of Energy and Power,Jiangsu University of Science and Technology,Zhenjiang Jiangsu 212003,China)

机构地区：[1]广州航海学院船舶与海洋工程学院,广东广州510725 [2]江苏科技大学能源与动力学院,江苏镇江212003

出　　处：《广州航海学院学报》2018年第2期51-53,62,共4页Journal of Guangzhou Maritime University

基　　金：广州航海学院创新强校工程项目(2017E06)

摘　　要：将描述非灰气体辐射特性的统计窄带模型与描述粒子辐射特性的Mie氏理论结合,计算了不同条件下富氧燃烧炉膛内烟气的总黑度.结果表明,由于富氧燃烧中CO2和H2O比例增大,颗粒的存在对燃烧产物黑度计算影响的规律发生变化.在煤粉炉常见的粒子浓度范围内,当行程为5 m时,气体辐射和粒子辐射占同样重要的地位,而行程较大(L>10 m)时,粒子辐射占主导地位,这时可以不考虑气体辐射对辐射换热的影响;当粒子的浓度较小时,可以不考虑粒子的存在对辐射换热的影响.The total blackness of flue gas in the chamber of oxygen-rich combustion furnace under different conditions is calculated through a statistical narrow-band（ SNB） model describing the radiation characteristics of non-ash gases combined with Mie theory which describes the radiation characteristics of particles. Results show that due to the increase of CO_2 and H_2O ratio in the Oxy-coal Combustion,the existence of particle changes the law of the influence of Flue Gas Emissivity of combustion products. In the range of particle concentrations that are common in pulverized coal boiler,when the path length is 5 m,gas radiation and particles radiation occupy and equally important position.;when the path length is large（ L〉 10 m）,the radiation of particles is dominant,and the effect of gas radiation on the heat transfer can＇t be considered. When the particles concentration is small,the effects of the particle＇s existence on the radiation heat transfer can be ignored.

关 键 词：富氧燃烧 粒子浓度 烟气黑度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]