Journal of computational fluids engineering (한국전산유체공학회지)

Korean Society of Computational Fluids Engineering (한국전산유체공학회)
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A NUMERICAL STUDY ON THE HEAT AND FLUID FLOW IN A REGENERATIVE OXY-FUEL COMBUSTION SYSTEM

순산소 연소용 축열시스템 내에서의 열 유동 수치해석

  • Kang, K. (Maritime and Ocean Engineering Research Institute, Korea Institute of Ocean Science & Technology) ;
  • Hong, S.K. (Korea Institute of Energy Research) ;
  • Noh, D.S. (Korea Institute of Energy Research) ;
  • Ryou, H.S. (School of Mechanical Engineering, Chung-Ang Univ.)
  • 강관구 (한국해양과학기술원 선박해양플랜트연구소) ;
  • 홍성국 (한국에너지기술연구원) ;
  • 노동순 (한국에너지기술연구원) ;
  • 유홍선 (중앙대학교 기계공학부)
  • Received : 2013.03.11
  • Accepted : 2013.09.30
  • Published : 2013.09.30
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Abstract

A pure oxygen combustion technology is crucial in Carbon Capture and Storage (CCS) technology especially in capturing of $CO_2$, where CCS will reduce 9 $GtCO_2$ by 2050, which is 19% of the total $CO_2$ reduction amount. To make pure oxygen combustion feasible, a regenerative system is required to enhance the efficiency of pure oxygen combustion system. However, an existing air combustion technology is not directly applicable due to the absence of nitrogen that occupies the 78% of air. This study, therefore, investigates the heat and fluid flow in a regenerative system for pure oxygen combustion by using commercial CFD software, FLUENT. Our regenerative system is composed of aluminium packed spheres. The effect of the amount of packed spheres in regenerator and the effect of presence or absence of a bypass of exhaust gas are investigated. The more thermal mass in regenerator makes the steady-state time longer and temperature variation between heating and regenerating cycle smaller. In the case of absence of bypass, the regenerator saturates because of enthalpy imbalance between exhaust gas and oxygen. We find that 40% of exhaust gas is to be bypassed to prevent the saturation of regenerator.

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References

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