Applied Chemistry for Engineering (공업화학)

The Korean Society of Industrial and Engineering Chemistry (한국공업화학회)
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A Study on the Optimal Operating Conditions for an Unreacted Hydrogen Oxidation-Heat Recovery System for the Safety of the Hydrogen Utilization Process

수소 활용공정 안전성 확보를 위한 미반응 수소 산화-열 회수 시스템의 운전 조건 최적화 연구

  • Younghee Jang (Department of Environmental Energy Engineering, Graduate School of Kyonggi University) ;
  • Sung Su Kim (Department of Environmental Energy Engineering, Kyonggi University)
  • 장영희 (경기대학교 일반대학원 환경에너지공학과) ;
  • 김성수 (경기대학교 환경에너지공학과)
  • Received : 2023.04.10
  • Accepted : 2023.05.02
  • Published : 2023.06.10
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Abstract

In this study, a catalytic oxidation-heat recovery system was designed that can remove unreacted with a concentration of about 1% to 6% in the exhaust gas of hydrogen fuel cells and recover heat to ensure safety in the hydrogen economy. The safety system was devised by filling hydrogen oxidation catalysts at room temperature that can remove unreacted hydrogen without any energy source, and an exhaust-heat recovery device was integrated to efficiently recover the heat released from the oxidation reaction. Through CFD analysis, variations in pressure and fluid within the system were shown depending on the filling conditions of the hydrogen oxidation system. In addition, it was found that waste heat could be recovered by optimizing the temperature of the exhaust gas, flow rate, and pressure conditions within the heat recovery system and securing hot water above 40 ℃ by utilizing the exhaust gas oxidation heat source above 300 ℃. Through this study, it was possible to confirm the potential of utilizing hydrogen processes, which are applied in small to medium-sized systems such as hydrogen fuel cells, as a safety system by evaluating them at a pilot scale. Additionally, it could be a safety guideline for responding to unexpected hydrogen safety accidents through further pilot-scale studies.

본 연구는 수소 경제 사회의 안전 확보를 위해 수소 연료전지 후단 배출된 미반응 수소를 안정적으로 산화하는 방안에 대해 논의하였다. 안전 시스템은 미반응 수소를 에너지원 없이 제거할 수 있는 상온 산화촉매를 충진하였으며, 이때 반응으로 배출되는 산화열은 안정적으로 회수할 수 있는 열 회수 장치를 연계하고자 하였다. 그 결과, 수소 산화 시스템의 충진 조건에 따라 시스템 내 압력 및 유체 흐름이 변화함을 CFD 분석을 통해 확인하였다. 또한 배가스 온도, 열 회수기 내 유량 및 압력조건을 최적화하여 300 ℃ 이상의 배가스 산화 열원을 40 ℃ 이상의 온수를 확보하는 방식으로 폐열을 회수할 수 있음을 확인하였다. 본 연구를 통해 수소 연료전지와 같은 중·소규모 사업장에 적용된 수소 활용 공정을 실증 규모로 평가하여 안전 시스템으로의 가능성을 확인하였다. 추후 실증화 연구를 통해 예측하지 못한 수소 안전사고에 대해 대응할 수 있는 안전 가이드로 활용될 수 있다고 판단된다.

Keywords

Acknowledgement

본 연구는 2020학년도 경기대학교 대학원 연구원장학생 장학금 지원에 의하여 수행되었음.

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