The Study on Heat Transfer Model and Algorithm of Multi-Sectional Regenerative Air Heater in Power Plant Boiler Based on Analytical Method

Abstract

Tri-sectional regenerative air heater is used widely because of its compactness and better performance. Study on the matching analytical calculation method of heat transfer is rarely carried out because of the complicated heat transfer process. This paper developed a model to solve the heat transfer calculation of multi-sectional regenerative air heaters, which usually have several layers. Then we designed the computational procedure to carry out the model. One example of a tri-sectional regenerative air heater with hot layer and cold layer shows the effectiveness of the algorithm, and the results suggest that this approach is valid. The impact of leakage on performance of the regenerative air heater was discussed. There is a negative linear correlation between exhaust gas temperature and air leakage, and boiler efficiency has a nearly linear negative correlation with air leakage.