高速射流条件下煤粉燃烧特性的实验研究  

Experimental Study on Characteristics of Pulverized Coal Combustion Under the High-speed Jet Condition

作　　者：黄文仕 张扬[1] 张琦[1] 蒋方舟[1] 吴玉新[1] HUANG Wenshi;ZHANG Yang;ZHANG Qi;JIANG Fangzhou;WU Yuxin(Department of Energy and Power Engineering,Tsinghua University,Bejing 100084,China)

机构地区：[1]清华大学能源与动力工程系,北京100084

出　　处：《工程热物理学报》2022年第8期2119-2126,共8页Journal of Engineering Thermophysics

基　　金：国家自然科学基金项目(No.51761125011);清华大学山西研究院种子基金。

摘　　要：高速射流条件是实现煤粉MILD燃烧状态的重要手段,为了研究高速射流对煤粉着火及燃烧特性的影响,基于Hencken型平焰燃烧系统开展了高速煤粉射流燃烧实验,通过测量煤粉火焰温度及煤颗粒流动行为分析了提高射流速度对煤粉射流燃烧特性的影响。结果表明,射流速度的提高使煤粉火焰峰值温度降低,轴线方向和径向的火焰温度均匀性均提升,趋向于进入MILD燃烧状态,同时燃烧主体区域滞后、辐射散热减弱、颗粒弥散程度增强;高速条件下射流上游的煤粉火焰升温速率提高,体现了湍流对煤粉着火的促进作用。High-speed jet condition is an important means to realize MILD combustion mode of pulverized coal. In order to study the influence of high-speed jet on ignition and combustion characteristics of pulverized coal, pulverized coal combustion experiments in a high-speed jet were carried out with Hencken flat flame combustion experimental equipment. The influence of jet velocity on combustion characteristics of pulverized coal was analyzed by measuring flame temperature and particle dispersion. The results show that high jet velocity reduces the peak temperature of pulverized coal flame and improves the uniformity of flame temperature in both axial direction and radial direction, which are close to the typical characteristics of MILD combustion. At the same time, as the jet velocity increases, the main combustion area lags behind, the radiation heat dissipation is weakened and the dispersion of coal particles is enhanced. The promotion of turbulence in high-speed jet on coal ignition is reflected by accelerating the temperature rise of pulverized coal flame at the initial stage of jet.

关 键 词：煤燃烧 高速射流 Hencken燃烧器 无焰燃烧 

分 类 号：TQ534[化学工程—煤化学工程]