Journal of Energy Engineering (에너지공학)

The Korean Society for Energy (한국에너지학회)
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A Numerical Study on the Efficiency of an Industrial Furnace for Oxygen Combustion Conditions

산소부화용 공업로의 운전조건이 열효율에 미치는 영향

  • Kim, Kang-Min (School of Mechanical Engineering, Pusan National University) ;
  • Lee, Yeon-Kyung (School of Mechanical Engineering, Pusan National University) ;
  • Ahn, Seok-Gi (School of Mechanical Engineering, Pusan National University) ;
  • Kim, Gyu-Bo (Pusan Clean Coal Center, Pusan National University) ;
  • Yoo, In (Combustech) ;
  • Jeon, Chung-Hwan (School of Mechanical Engineering, Pusan National University)
  • 김강민 (부산대학교 기계공학부) ;
  • 이연경 (부산대학교 기계공학부) ;
  • 안석기 (부산대학교 기계공학부) ;
  • 김규보 (부산대학교 화력발전에너지분석기술센터) ;
  • 유인 ((주)컴버스텍) ;
  • 전충환 (부산대학교 기계공학부)
  • Received : 2015.05.12
  • Accepted : 2015.08.28
  • Published : 2015.09.30
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Abstract

After a reheating furnace installation, the modification of the size and the heat capacity is very difficult. Therefore, the development of design package tool is required for the computation on the correct specifications before the design and the installation. Prior to development of the design tool, a module that calculates the amount of heat loss of each part according to the specifications for determining the thermal efficiency of a continuous heating furnace was developed and applied to the oxy-fuel industrial furnace. Through this, the effects of fuel type, oxygen fraction and recirculation on the efficiency of the furnace of which the output is 110Ton/hour were analyzed. In oxy-fuel combustion condition, the efficiency was 15% higher than air combustion conditions. With the using COG(Coke Oven Gas) instead of LNG, the efficiency was slightly increased. In the air combustion condition, the efficiency was increased about 33% with the preheated air. But, in oxy-fuel condition, the amount of exhaust gas was reduced, so the efficiency was increased about 7%.

가열용 공업로는 설치 후에는 기본적인 로의 크기 및 열용량의 수정이 어려우므로 설계, 제작 설치 전 정확한 기본사양의 산출을 위한 통합적 설계 프로그램의 개발이 필요하다. 설계를 위한 프로그램을 개발하기에 앞서, 본 연구에서는 만족할 수 있는 연속식 가열로의 효율을 결정하기 위하여 로의 기본 사양에 의한 각 부의 손실열량을 계산하는 산술적 모듈을 제작하여 산소용 공업로에 적용하였다. 이를 통해 로의 설계 조건인 사용 연료 종류, 연소방식, 배기가스 재순환 유무에 따라 생산량이 110Ton/hour인 공업로의 효율 변화를 확인하였다. 순 산소 연소 조건에서는 공기 연소 조건보다 효율이 15% 이상 높아진 것을 확인하였다. COG(Coke Oven Gas)를 사용하였을 시, 천연가스를 연료로 할 때보다 상대적으로 효율이 상대적으로 높아졌다. 공기 연소에서는 예열 공기를 사용하였을 시 냉 공기보다 효율이 33% 정도 증가하였으나, 순 산소 조건에서는 배기가스 양이 감소하여 효율이 7% 상승하였다.

Keywords

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