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유병훈(Byeonghun Yu),김종민(Jong-Min Kim),이승로(Seungro Lee),금성민(Sung-Min Kum),이창언(Chang-Eon Lee),손승길(Seung-Kil Son) 한국연소학회 2011 KOSCOSYMPOSIUM논문집 Vol.- No.43
In this study, the effect of exhaust gas recirculation on NOx and CO emissions and flame behaviors on the burner surface were experimentally investigated by various equivalence ratio using a condensing boiler as typical household premixed combustion device. As results, the NOx and CO emissions increased as the equivalence ratio and boiler capacity increased without exhaust gas recirculation. However, NOx and CO emissions decreased, when the rate of exhaust gas recirculation increased, Also if equivalence ratio was increased to improve the efficiency of boiler, the part of the metal fiber burner surface changed in red. In addition, when the rate of exhaust gas recirculation increased, the part of the metal fiber burner surface was almost unchanged.
열역학적 해석을 통한 신규 보일러와 기존 보일러의 성능 비교
유병훈(Byeonghun Yu),김수익(Soo Ik Kim),박태준(Taejoon Park),이창언(Chang-Eon Lee) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.11
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.
배기가스 재순환 방식이 예혼합 연소시스템에 미치는 영향
유병훈(Byeonghun Yu),이승로(Seungro Lee),금성민(Sung-Min Kum),이창언(Chang-Eon Lee) 한국연소학회 2013 KOSCOSYMPOSIUM논문집 Vol.- No.46
The premixed combustion system applying exhaust gas recirculation was investigated to achieve the low pollutant emission and the high thermal efficiency. In this study, it was studied the effects of EGR on the thermal efficiency, NOx and CO emissions with various EGR ratios and equivalence ratios. As results, when equivalence ratio was increased, thermal efficiency increased and NOx and CO concentration increased. When EGR was applied, NOx and CO concentration decreased and thermal efficiency increased. Especially, in the case of 15% of EGR ratio at 0.85 of equivalence ratio, NOx and CO concentration will be a smaller than these of a current operating condition of the boiler and thermal efficiency was about 1.7% higher.
유병훈(Byeonghun Yu),김진수(Jinsu Kim),이창언(Chang-Eon Lee) 한국연소학회 2014 한국연소학회지 Vol.19 No.3
We examined the characteristics of NOx emission for CH4/air non-premixed flames using the exhaust gas recirculation(EGR) methods, which are the air-induced EGR(AI-EGR) and fuel-induced EGR(FI-EGR) methods. Our experimental results show that the NOx emission index(EInox) decreased with increasing EGR ratio. In the range needed to form a stable flame, the reduction rate of EInox for the FI-EGR method was approximately 29% when the EGR ratio was 20%, and the reduction rate for the AI-EGR method was approximately 28% with 25% of the EGR ratio. According to the flame structure based on numerical results, high temperature regions for the FI-EGR method were narrower and lower than those for the AI-EGR method at the same EGR ratio. Furthermore, based on the experimental results for swirl flames, the reduction rate of EInox for the FI-EGR method was approximately 49% with 15% of the EGR ratio, while the maximum reduction rate for AI-EGR method was approximately 45% with 25% of the EGR ratio. Consequently, we verified that the FI-EGR method was more effective than the AI-EGR method in reducing NOx emission for non-premixed flames with EGR. We expect that the results of this study will provide fundamental information relating to hybrid combustion systems, which can be used in the design of combustion systems in the future.
직교류 열교환기의 모듈수에 따른 열전달 및 압력강하 특성
김종민,김진수,유병훈,금성민,이창언,이승로,Kim, Jong-Min,Kim, Jinsu,Yu, Byeonghun,Kum, Sungmin,Lee, Chang-Eon,Lee, Seungro 한국에너지학회 2013 에너지공학 Vol.22 No.2
This study investigated the characteristics of heat transfer and pressure drop for cross-flow heat exchanger of premixed combustion system. The premixed burner was in front of a heat exchanger, and the number of heat exchanger modules was changed to investigate the characteristics of NOx and CO emissions with various equivalence ratios. In addition, the effectiveness, entropy generation and pressure drop were calculated by various number of heat exchanger modules and the performance of heat exchanger was analyzed by the exergy loss. 본 연구는 예혼합 연소시스템에 적용할 직교류 엇갈림 배열 열교환기의 열전달 및 압력강하 특성 검토를 목적으로 한다. 따라서 비예혼합화염보다 화염길이가 짧고 당량비 조절을 통해 NOx 및 CO 배출을 제어할 수 있는 예혼합방식의 버너 앞에 모듈로 구성된 열교환기를 설치한 후 당량비를 변화시킬 때 NOx와 CO의 배출특성을 검토하였다. 또한 열교환기의 모듈 변화에 대한 유용도, 엔트로피 생성량 및 압력강하를 계산하였고 엑서지 로스를 검토하여 열교환기의 성능을 분석하였다.