한국산학기술학회논문지 (Journal of the Korea Academia-Industrial cooperation Society)

  • 제17권9호
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  • Pages.126-132
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  • 2016
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  • 1975-4701(pISSN)
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  • 2288-4688(eISSN)
한국산학기술학회 (The Korea Academia-Industrial cooperation Society)
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증기 개질기의 반응 및 열변형 특성에 미치는 공정가스와 버너가스 온도의 영향

Effect of Process Gas and Burner Gas Temperature on Reaction and Thermal Deformation Characteristics in a Steam Reformer

  • 한준희 (중앙대학교 기계시스템 엔지니어링학과) ;
  • 김지윤 (중앙대학교 차세대 에너지 연구소) ;
  • 이정희 (선박해양플랜트연구소 해양플랜트 산업기술센터) ;
  • 이성혁 (중앙대학교 기계공학부)
  • Han, Jun Hee (Dept. of Mechanical Systems Engineering, Chung-Ang University) ;
  • Kim, Ji Yoon (Energy Safety Research Institute, Chung-Ang University) ;
  • Lee, Jung Hee (Technology Center Offshore Plant Industries, KRISO) ;
  • Lee, Seong Hyuk (Dept. of Mechanical Engineering, Chung-Ang University)
  • 투고 : 2016.08.08
  • 심사 : 2016.09.09
  • 발행 : 2016.09.30
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초록

본 연구는 전산유체역학 기법을 이용하여 수소 생산 플랜트의 개질 튜브 공정가스와 버너 가스 온도에 따른 화학반응과 열변형 특성을 분석한다. 개질로 내부의 온도는 약 800 K 내지 1000 K 이상으로 고온으로 유지되기 때문에 튜브의 열변형 문제가 심각하게 발생할 수 있다. 따라서 개질로의 구조건전성을 평가하고 안정된 생산력을 가진 장비를 운영하기 위해서 반응과 열변형 특성에 대한 이해는 필수적이다. 본 연구는 상용 전산해석 코드(ANSYS Fluent/Mechanical V.13.0)를 사용하여, 대류, 전도 및 복사 열전달을 포함한 복합 열전달과 난류유동을 3차원적으로 해석하였다. 특히, 열유동 특성에 따른 연성해석(Fluid-Solid Interaction: FSI)를 수행하였으며 고온 버너가스와 공정가스 운전조건에 따른 반응 특성과 열변형 변화를 분석하였다. 수치해석 결과, 개질 공정가스와 버너 가스의 주입온도가 각각 200 K 감소하면, 수소생성량은 최대 약 4 배, 최소 약 2 배 감소한다. 또한, 공정가스와 버너 가스의 주입온도에 따라 열변형은 최대 약 20%, 최소 약 15% 감소한다.

This study numerically investigates the characteristics of chemical reactions and thermal deformation in a steam reformer. These phenomena are significantly affected by the high-temperature burner gas and the process gas conditions. Because the high temperature of the burner gas ranges from 800 to 1000 K, the reformer tubes undergo substantial thermal deformation, eventually resulting in structural failure. Thus, it is necessary to understand the characteristics of the reaction and thermal deformation under the operating conditions to evaluate the reformer tubes for sustainable, stable operation. Extensive numerical simulations were carried out using commercial CFD code (ANSYS FLUENT/MECHANICA Ver. 13.0) while considering three-dimensional turbulent flows and combined heat transfer including conduction, convection, and radiation. Structural analysis considering conjugated heat transfer between solid tubes and fluid flows was conducted using the Fluid-Solid Interaction (FSI) method. The results show that when the injection temperature of the process gas and burner gas decreased, the hydrogen production rate decreased significantly, and thermal deformation decreased by at least 15 to 20%.

키워드

참고문헌

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