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Investigation of flame characteristic in porous media burner with pores step distribution in radial direction
Combustion Theory and Modelling ( IF 1.3 ) Pub Date : 2020-03-16 , DOI: 10.1080/13647830.2020.1739335
Liu Hui 1 , Kang Liusheng 2 , Yi Zhi 3 , Yang Xiaoxi 3 , Wang Duo 4
Affiliation  

In recent years, attention has been focused on the use of porous materials to enhance the efficiency of combustion systems and reduce the pollutants emission. However, the porous media burners have the problem of inclined flame when used for surface heat treatments. In order to solve this problem, a new structure of porous media burner with pores step distribution in radial direction is proposed in this paper, four representative pores distributions in radial direction are chosen in order to reveal the influences of the new structure on flame characteristic of the porous media burner. Results show that the radial distribution of pores in combustion zone of burner affects the flame characteristic greatly. In the pore concentrated region, the increase of resistance loss reduces the gas flow rate, and causes the temperatures of gas and solid lower than that in the other regions. Combustion in porous media burner with radial pores concentrated gradually from the centre to the wall is the optimal structure in the four cases. Compared with the other cases, the optimal structure can reduce the temperature difference between the wall and environmental, and then reduce the wall heat loss, increase the thermal efficiency of the burner, improve the flame distribution characteristics, reduce the pore blocking and the possibility of structural failure, and increase the service life of the burner.

中文翻译:

径向孔隙阶梯分布的多孔介质燃烧器火焰特性研究

近年来,人们关注的是使用多孔材料来提高燃烧系统的效率并减少污染物排放。然而,多孔介质燃烧器在用于表面热处理时存在火焰倾斜的问题。针对这一问题,本文提出了一种径向孔隙阶梯分布的多孔介质燃烧器新结构,选取了四种具有代表性的径向孔隙分布,以揭示新结构对燃烧器火焰特性的影响。多孔介质燃烧器。结果表明,燃烧器燃烧区孔隙的径向分布对火焰特性影响很大。在孔隙集中区,阻力损失的增加使气体流速降低,并导致气体和固体的温度低于其他地区。径向孔从中心向壁逐渐集中的多孔介质燃烧器中的燃烧是四种情况下的最佳结构。与其他情况相比,优化的结构可以减小壁面与环境之间的温差,进而减少壁面热损失,提高燃烧器的热效率,改善火焰分布特性,减少气孔堵塞和燃烧的可能性。结构失效,增加燃烧器的使用寿命。
更新日期:2020-03-16
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