A Numerical Study of the Characteristics of Heat Transfer in External Heat Exchanger of CFB Boiler

순환유동층보일러 외부열교환기의 열전달 특성에 관한 수치해석적 연구

With the increasing trend in CFB(Circulating Fluidized Bed) boiler scale, the EHE(External Heat Exchanger) must be adopted to the large-scale boilers to recover insufficient heat transfer surface. In this study, the numerical analysis model for EHE in commercial 300MWe CFB boiler was developed with the inclusion of mechanistic model, which enables the heat transfer prediction. Finally, the calculated absorbed heat and derived heat transfer coefficient are evaluated through the verification with experimental data.