雾化空燃比对精甘油旋流喷雾燃烧与污染物的影响  

Influence of Atomizing Air-to-Liquid Ratio on Combustion and Emission of Pure Glycerol Swirling Spray Flame

作　　者：张振东 谢天 田波 ZHANG Zhendong;XIE Tian;TIAN Bo(China-UK Low Carbon College,Shanghai Jiao Tong University,Shanghai 201306,China;College of Engineering,University of Leicester,Leicester LE17RH,UK)

机构地区：[1]上海交通大学中英国际低碳学院,上海201306 [2]莱斯特大学工程学院,英国莱斯特LE17RH

出　　处：《工程热物理学报》2024年第4期1224-1232,共9页Journal of Engineering Thermophysics

基　　金：科技部国际科技交流项目(21Z010802213)。

摘　　要：在生物燃料制备工艺中,甘油是重要的副产物之一,具有产量大、价格低、同时热值尚可的特点,精炼过后的产品可作为工业中的补充燃料。本文设计了一个可控的旋流喷雾燃烧平台,通过分析不同雾化空燃比(ALR)下精甘油的实际火焰、OH*荧光信号以及燃烧室流场信息,以探究ALR变化对于精甘油喷雾燃烧的影响。此外,对精甘油喷雾燃烧后烟气中的NO、CO和CO_(2)含量随ALR变化的趋势进行分析。结果表明,随着ALR的升高,旋流喷雾火焰的回流区域扩大,甘油火焰中心的OH*信号强度和范围增加,甘油的雾化质量提高。排放方面,NO浓度大体随ALR增加而提升,随当量比增加先升高后下降;CO则是随ALR升高而降低,随当量比增加先降低,后有一定程度升高。提升ALR有利于降低喷雾液滴粒径,促进液滴蒸发及混合,在一定工况范围内能实现低NO_(x)和CO的甘油高效稳定燃烧。Glycerol is one of the most important by-products in biofuel manufacturing process,with high yield,low price and acceptable calorific value.The refined glycerol can be applied as a supplementary fuel in industry.In this paper,a controllable swirling spray burner is designed.The influence of ALR changes on pure glycerol spray combustion is explored through analysing flame,OH*chemiluminescence signals and flow field information at different ALR conditions.Besides,NO,CO and CO_(2)concentration in exhaust gas at different ALR conditions is also collected and analysed.The result shows that with the increase of ALR,the recirculation zone of swirling spray flame expands,the area and intensity of OH*chemiluminescence signal at the centre of the flame increase,and the atomization quality of glycerol also improves.As for emission,NO concentration generally increases with the increase of ALR.While equivalence ratio increases,NO concentration first increases,then decreases.CO concentration decreases with the increase of ALR.While equivalence ratio increases,CO concentration first decreases,then increases to a certain extent.The increase of ALR is beneficial for reducing droplet size of the spray,improving droplet evaporation and mixture,and stable combustion of glycerol with low NO_(x)and CO emission within a certain working condition.

关 键 词：精甘油 雾化空燃比 OH*荧光信号 PIV流场 污染物排放 

分 类 号：TK16[动力工程及工程热物理—热能工程]