Design And Optimization Of Regenerative Element Of Rotary Air Preheater

Rotary air preheater is an important auxiliary equipment of power plant boiler.The core component is the rotor composed of heat storage elements.The flow and heat transfer performance of regenerative element directly determines whether the rotary air preheater can operate safely and efficiently.The velocity,temperature,pressure distribution,heat transfer and resistance characteristics of the internal flow field of the regenerative element with different plate types and different corrugated parameters are studied.The structure improvement of NF plate type heat storage element can provide theoretical basis for the optimal design of rotary air preheater.The heat transfer performance and internal air flow performance of the heat storage element were studied by numerical simulation method.Through the simulation of three common plate type heat storage elements,it was found that the heat transfer performance of the heat storage element with oblique ripple was better than that without oblique ripple,but the air flow performance in the regenerative channel was poor;the wall temperature of the heat storage element had a greater influence on its heat transfer performance However,it has little effect on the internal air flow resistance.By changing the angle,height and width of the ripple,it is found that the heat transfer performance of the heat storage element is the best when the ripple angle is 60 ° and the air flow performance is the best when the inclination angle is 20 °.The influence of wavy width on air flow and heat transfer performance is small.The resistance coefficient and Nusselt number of the regenerator increase with the increase of the corrugation height.It is found that the heat transfer performance of NF plate type heat storage element can be improved by adding spherical bulge or groove at the locating plate,but the flow resistance of internal air increases.The results show that the flow and heat transfer performance of the plate with grooves is better than that with spherical protuberances.Figure 39;Table 7;Reference 66...