Numerical Simulation And Optimization On Rotary Air Preheater

As an important auxiliary equipment of power plant boiler, rotary air preheater for the advantages of corrosion resistance, good heat exchange efficiency, long service life, comPact structure, low operation cost, is widely used in thermal power plant. The heat transfer plate is an important Part of rotary air preheater, the convective heat transfer and flow resistance characteristics is very important for the rotary air preheater economic, safe and reliable.Study of heat transfer characteristics and resistance characteristics of different heat transfer plate is very important for the selection of air preheater in power plant.In this Paper, the heat transfer characteristics and resistance characteristics of different heat transfer plates are studied by using numerical simulation method.The FNC plate corrugated section into a flat, three-dimensional model establishment of FNC plate and FNC plate type modified by numerical simulation, using longitudinal section images, compared before and after the same type of different speed, speed, temperature and pressure changes between different type images the same speed, speed, pressure the temperature nephogram, and compare the Nu number, pressure drop and drag coefficient f with Re number changes. FNC was found that the heat transfer coefficient was decreased and the heat transfer coefficient was decreased after modification. At the same time, the pressure drop is also decreased, and the flow resistance is decreased. Moreover, the heat transfer coefficient and the pressure drop of the inlet and outlet have a great change.The DU3E plate corrugated section into a flat section of the three-dimensional numerical simulation of plate type DU3E and modified DU3E, the cross section images, compared between before and after the same Pattern between different speed of pressure, velocity and temperature contours and modify different plate with the same speed of pressure, velocity and temperature contours, and comparison the number of Nu, pressure drop and drag coefficient f with Re number changes. It is found that the heat transfer coefficient and the pressure drop are also decreased, but the amplitude is small, and the drag coefficient decreases obviously.