열역학적 해석을 통한 신규 보일러와 기존 보일러의 성능 비교

초록

This study was conducted to design new-type boiler to obtain a higher efficiency than old-type boilers and we compared the efficiency of new-type and old-type boilers through the thermodynamic analysis prior to practical study of new-type boiler. Non condensing boiler(Non CB), existing condensing boiler(Existing CB) and waste heat recovery condensing boiler(WHR CB) are old-type boilers and exhaust gas recirculation-condensed water recirculation-waste heat recovery condensing boiler(EGR-CWR-WHR CB) is new-type boiler. In this study, we used variables such as air ratio, waste heat recovery performance, relative humidity of preheated air. We calculated maximum efficiency, through the thermodynamic equations with changing these variables. As a results, EGR-CWR-WHR CB proposed in this study was possible to obtain the efficiency of 93.91% and it is 7.04% higher than the efficiency of Existing CB(86.87%). Since it is possible to operate the boiler to air ratio is 1.1 due to the application of EGR and it is also possible to increase the relative humidity of preheated air due to the application of condensed water recirculation.