Numerical Simulation And Experimental Study On Heat Transfer And Flow Of Enamel Heat Storage Element Of Rotary Air Preheater

To alleviate the air preheater's plugging ash and corrosion problems after SCR denitration, the cold end of rotary air preheater generally uses enamel heat storage element. Compared with the conventional corten steel, enamel heat storage element's physical parameters change, such as density, specific heat, coefficient of thermal conductivity, general corten steel heat storage element's heat transfer and flow resistance calculation standard does not necessarily apply.So, it is of great significance to the rotary air preheater's cold end enamel heat storage element's selection and optimization as well as designing and calculating of the rotary air preheater, to research on the heat transfer and flow characteristics of enamel heat storage element with different structural parameters.This article selects three kinds of enamel heat storage element, by adopting 3d numerical simulation to study its heat transfer and flow characteristics, obtaining the element's internal flow field and temperature field distribution, and the change rule of nusselt number or resistance coefficient changing with reynolds, and comparing with experimental results, verifying the feasibility to study heat transfer and flow characteristics of enamel heat storage element by using numerical simulation. At the same time, by using three-dimensional numerical simulation method to optimize a kind of enamel plate named YH-HK/B08 which is commonly used in the cold end of rotary air preheater, obtaining the change rule of heat transfer and flow characteristics with the heat storage element's structural parameters such as wave angle, wave pitch, wave height, wave width. The results show that: under different structural parameters, enamel heat storage element's nusselt number increases with the increase of reynolds number, resistance coefficient decreases with the increase of reynolds number; enamel heat storage element's nusselt number, resistance coefficient: they all increase with the increase of wave angle named ?; they all decrease with the increase of wave pitch named s; they all increase with the increase of wave height; they all increase with the increase of wave width.