Journal of the Korean Institute of Gas (한국가스학회지)

The Korean Institute of GAS (한국가스학회)
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Characteristics of Temperature in Reformer Tube and Chemical Reaction for Steam Methane Ratio

수증기-메탄 혼합비에 따른 개질 튜브 내 온도 및 화학반응 특성

  • Han, Jun Hee (Dept. of Mechanical Systems Engineering, Chung-Ang University) ;
  • Kim, Ji Yoon (Energy Safety Research Institute of Chung-Ang University) ;
  • Lee, Seong Hyuk (Dept. of Mechanical Engineering, Chung-Ang University)
  • 한준희 (중앙대학교 기계시스템 엔지니어링학과) ;
  • 김지윤 (중앙대학교 차세대 에너지안전연구소) ;
  • 이성혁 (중앙대학교 기계공학부)
  • Received : 2016.06.15
  • Accepted : 2016.09.29
  • Published : 2016.10.31
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Abstract

The aim of numerical study is the investigation of the solid and fluid temperatures in a reformer tube and chemical reaction characteristics of different steam-carbon ratio. We considered conjugate heat transfer contain radiation, convection and conductive heat transfers. This is because steam reforming reaction of hydrocarbon occurred high temperature conditions up to 800 K- 1000 K by using commercial computational fluid dynamics (CFD) code (Fluent ver. 13.0). For numerical simulation, the Reynolds-Averaged Navier-Stokes, momentum and energy equation were employed. In addition, inside of reformer tube is assumed as the porous medium to consider the Nichrome-based catalyst. To analysis characteristics of tube temperature in chemical reaction, we changed steam-methane ratio(SCR) from 1 to 6. As increased SCR, the higher tube temperature and methane conversion were observed. It was obtained that the highest hydrogen production held in SCR of 5.

본 연구의 목적은 실제 산업현장에서 사용되는 수소 개질로 내 개질가스의 수증기-메탄 혼합비에 따른 튜브 내 온도 및 화학반응 특성을 수치 해석하는 것이다. 탄화수소의 수증기 개질반응은 800 K - 1000 K 이상의 고온에서 발생하기 때문에 대류, 전도 및 복사 열전달을 고려한 복합 열전달을 고려해야 한다. 수치해석은 상용 전산유체역학(CFD) 코드(ANSYS Fluent V.13.0)를 사용하였다. 본 연구에서 해석을 위해 Reynolds-Averaged Navier-Stokes, 운동량 및 에너지 방정식을 사용하고, 화학반응이 발생하는 튜브 내부는 니크롬 재질의 다공성 영역으로 가정하였다. 개질 튜브 내 온도 및 화학반응 특성을 비교하기 위해 메탄과 수증기의 혼합비를 1-6으로 증가시켜 비교 분석하였다. 수치해석 결과, 메탄에 대한 수증기 비율이 높을수록 튜브 내부의 온도가 증가하고, 메탄의 전화율이 증가한다. 그러나 수소 개질량은 수증기와 메탄의 비율이 5일 때 가장 많은 것을 알 수 있다.

Keywords

References

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