화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Journal of the Korean Industrial and Engineering Chemistry, Vol.13, No.1, 37-41, February, 2002
Export Citation
가압유동층 연소로에서 국내 무연탄의 연소특성
Combustion Characteristics of Domestic Anthracite Coal in a Pressurized Fluidized Bed Combustor
강석환, 한근희1, 진경태1, 강용†
  • 충남대학교 화학공학과
  • 1한국에너지기술연구소 에너지환경연구부
Suk-Hwan Kang, Kun-Hee Han1, Gyoung Tae Jin1, and Yong Kang†
  • Department of Chemical Engineering, Chungnam National University, Taejeon 305-764, Korea
  • 1Energy and Environmental Research Department, KIER, Korea
E-mail:
초록
유동층 연소로에서 국내 무연탄(발열량 : 4655 kcal/kg)의 연소특성을 고찰하였다. 실험 변수인 압력(200~600 kPa), 유동층 온도(850~950 ℃), 과잉공기의 양(10, 20, 30%)등이 연소로 내부에서 연소효율과 열전달계수에 미치는 영향을 규명하였다. 실험결과, 연소효율은 연소온도, 압력 그리고 과잉공기의 비가 증가할수록 증가하였으며 본 연구의 실험범위에서 연소효율은 80~90%으로 나타났다. 가압유동층 연소로내의 열전달계수는 223~571 W/m(2)K로 나타났다. 열전달계수는 연소온도와 압력이 증가할수록 증가하였으나, 과잉공기의 비가 증가할수록 감소하는 것으로 나타났다. 열전달계수는 무차원군인 Nu, Re, 그리고 Pr에 의한 상관식으로 나타낼 수 있었다.
Combustion characteristics of domestic anthracite coal (calorific heating value : 4655 kcal/kg) have been studied in a pressurized fluidized bed combustor. Effects of operating variables such as pressure (200~600 kPa), bed temperature (850~950 ℃) and excess air (10, 20, 30%) on the combustion efficiency and heat transfer coefficient of the combustor have been investigated. As a result of this study, it has been found that the combustion efficiency, which increased with increasing the bed temperature, pressure and excess air ratio, was in the range of 80~99% within the experimental conditions of this study. The heat transfer coefficient in a pressurized fluidized bed combustor has been found to be in the range of 223~571 W/m(2). The heat transfer coefficient increased as the bed temperature and pressure were increased, but it decreased with increased the excess air ratio. The heat transfer coefficient was expressed in terms of dimensionless groups of Nu, Re and Pr.
Keywords:fluidized bed;combustion efficiency;heat transfer coefficient
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