서지주요정보
이산화탄소를 희석제로 한 혼합기의 백금촉매 반응 특성 = Characteristics of catalytic combustion of $CO_2$ diluted gas mixtures with platinum
서명 / 저자 이산화탄소를 희석제로 한 혼합기의 백금촉매 반응 특성 = Characteristics of catalytic combustion of $CO_2$ diluted gas mixtures with platinum / 남창호.
저자명 남창호 ; Nam, Chang-Ho
발행사항 [대전 : 한국과학기술원, 2003].
Online Access 원문보기 원문인쇄

소장정보

등록번호

8014795

소장위치/청구기호

학술문화관(문화관) 보존서고

DME 03067

휴대폰 전송

도서상태

이용가능

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반납예정일

초록정보

The combustion systems that use the oxygen and recycled flue gas mixture as oxidant have many benefits from the point of view of environment. In such a system, the excess $CO_2$ can be easily collected from the combustor exit since the exhaust gas contains $CO_2$ with high concentration. In the dry recycle mode of the system, where the flue gases are recycled after water removal, the oxidant can be regarded as the mixture of $O_2$ and $CO_2$. Applying the catalytic combustion to the system can compensate the reduction of efficiency. For the application of catalytic combustion, it is required to investigate the feature of the catalytic reaction of combustion mixture with $CO_2$. This work did the validation of kinetics model in experiment with ignition temperature and modified the reaction kinetics to describe the gas mixture. We discuss new kinetic model to predict the ignition temperature of $H_2/O_2$ mixture in the practical region of composition. We measure the ignition temperatures of the gas mixtures flowing towards resistively heated platinum with various composition ratios and various diluent gases, i.e., $N_2$ and Ar as well as $CO_2$. The numerical simulation includes detailed reaction mechanism for the surface reaction as well as gas phase transport properties of the mixtures. Compared with $N_2$ or Ar, the $CO_2$ dilution shows higher ignition temperature by about 50K, even at the same composition ratio. The ignition temperature increases imply the reduction of catalytic reactivity on the platinum catalyst. By the way, the heterogeneous ignition of hydrocarbon fuels shows that $CO_2$ has no effect on the surface reaction of hydrocarbon on platinum. Catalytic combustion of $CH_4/O_2/CO_2$ in a channel is simulated by plug flow model which include detailed chemistry and reaction model in surface phase as well as in gas phase. Because heat capacity of $CO_2$ is larger than by 30-50% compared to that of $N_2$, the temperature distribution in the channel is smooth and the maximum temperature is lower with the same inlet temperature. The light off temperature of $CO_2$ diluted mixture at equivalence ratio of 0.4 is 742K which is 12K higher than that of $N_2$ diluted mixture. The channel length to acquire the complete conversion is larger in the $CO_2$ dilution case. The $C_2$ emission of $CH_4/O_2/CO_2$ mixture is significant since $CO_2$ has a role as a third body in the gas reactions which are major paths to produce $C_2$ hydrocarbon.

서지기타정보

서지기타정보
청구기호 {DME 03067
형태사항 viii, 102 p. : 삽도 ; 26 cm
언어 한국어
일반주기 부록 : 스텝핑모터 저어를 위한 프로그램 코드
저자명의 영문표기 : Chang-Ho Nam
지도교수의 한글표기 : 신현동
지도교수의 영문표기 : Hyun-Dong Shin
학위논문 학위논문(박사) - 한국과학기술원 : 기계공학전공,
서지주기 참고문헌 : p. 94-96
주제 이산화탄소
촉매
백금
표면 반응
연소
$CO_2$
catalyst
platinum
surface reaction
combustion
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