### Thermal calculation method for quad-sectional regenerative air preheater

CHEN Changxian, SUN Fengzhong, LI Fei, WU Yanyan

1. School of Energy and Power Engineering, Shandong University, Jinan 250061, Shandong, China
• Received:2013-11-29 Revised:2014-03-05 Published:2013-11-29

Abstract: A new thermal calculation model for quad-sectional regenerative air preheater was investigated based on the analysis of operating mode and heat transfer characteristics of quad-sectional air preheaters. The model included two calculating steps: the average outlet flue gas temperature and the weighted average outlet air temperature were obtained through the first step calculation; and based on the first step calculation results, the average outlet air temperatures were obtained in right-secondary airside, primary air side and left-secondary airside respectively by the second step calculation. The results showed that the maximum and minimum relative deviations between calculated values and design values were 2.27% and 0.21% respectively. For a 300 MW circulating fluidized bed boiler unit with quad-sectional air preheater, the maximum and average relative deviations between calculated values and actual operation data were 4% and 1.8% respectively, the accuracy and reliability of this thermal calculation model were verified.

CLC Number:

• TK222
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