富氧燃烧锅炉炉膛内烟气辐射特性计算  

Calculation of Flue Gas Emissivity in Oxy-coal Combustion Boiler

作　　者：张艳伟[1] 葛学利[1] 聂宇宏[2] 

机构地区：[1]上海锅炉厂有限公司,上海200245 [2]江苏科技大学机电与动力工程学院,江苏张家港215600

出　　处：《锅炉技术》2016年第5期51-54,共4页Boiler Technology

摘　　要：用指统计窄带模型结合Mie氏散射理论计算了带有颗粒物的富氧燃烧锅炉炉膛内烟气的黑度,与逐线计算的富氧燃烧气体的黑度以及空燃时烟气黑度结果的比较表明,此方法可以准确地计算富氧燃烧条件下烟气的黑度,并计算了常规燃煤时颗粒物浓度下不同射线行程、不同烟气循环比、不同温度下富氧燃烧烟气的黑度。结果表明:颗粒物对烟气黑度的计算有较大影响;同时,由于富氧燃烧中CO_2和H_2O比例的增大,气体成分对燃烧产物的黑度也存在较大影响。本研究可为富氧燃烧锅炉的设计提供依据。Radiative properties of combustion gases and heat transfer characteristics inside oxy-fuel boiler are different from those found in air-fired boiler. Emissivity of flue gas contai- ning mixtures of water vapor, carbon dioxide and particles are calculated by statistical nar- row-band （SNB） model combined with Mie theory. Comparison with reference calculation based on line by line calculation, and with the emissivity based on experiments shows that the method can be used to calculation the emissivity of flue gas in oxy-eoal combustion boiler. The method is used to calculate the emissivity of oxy-coal combustion flue gas under various path length, various H2O/CO2 radio and various temperature. Results show that the flue gas emissivity is influenced by particles and gas together. Under small path length, gas radiation is strong, but under large path length, the particle radiation is more important.

关 键 词：富氧燃烧 统计窄带模型 颗粒辐射 烟气黑度 

分 类 号：TK124[动力工程及工程热物理—工程热物理]