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가압유동층에서 무연탄 연소시 열전달 특성

Heat Transfer Characteristics in a Pressurized Fluidized Bed for Anthracite Coal Combustion

강석환 한근희¹ 진경태¹ 강용^†

Suk-Hwan Kang Kun-Hee Han¹ Gyoung-Tae Jin¹ Yong Kang^†

충남대학교 화학공학과, 대전 305-764 ¹한국에너지기술연구소 에너지환경연구부, 대전 305-343

Department of Chemical Engineering, Chungnam National University, Daejeon 305-764, Korea ¹Energy and Environmental Research Department, Korea Institute of Energy Research, Daejeon 305-343, Korea

HWAHAK KONGHAK, April 2002, 40(2), 218-223(6), NONE

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Abstract

벤치 규모의 가압유동층 연소로에서 무연탄 연소시 수평 전열관과 유동층간의 열전달 특성을 연구하였다. 조업 변수인 유동화속도(0.9, 1.1, 1.3 m/s), 유동층온도(850, 900, 950 ℃) 그리고 공기과잉률(10, 20, 30%) 등이 수평관의 경막열전달계수에 미치는 영향을 검토하였다. 유동층영역 내 수평전열관의 열전달계수는 유동층의 온도에 비례하고, 유동화 속도에 반비례하는 경향을 나타내었다. 가압유동층 연소로에서 수평전열관의 경막열전달계수는 상압기포유동층에서의 열전달계수(200 W/m(2)K)보다 매우 높은 370-720 W/m(2)K의 범위를 보였다. 가압유동층에서 열전달계수는 조업변수 함수의 무차원군과 차원식의 상관 관계식으로 도출되었다.

Heat transfer characteristics between the horizontal tube and the fluidized-bed proper have been investigated in a bench-scale pressurized fluidized-bed combustor for the combustion of anthracite coal. Effects of fluidizing velocity(0.9, 1.1, 1.3 m/s), bed temperature(850, 900, 950 ℃) and amount of excess air(10, 20, 30%) on the individual heat transfer coefficient have been determined. The heat transfer coefficient has increased with increasing bed temperature, while it has decreased with increasing fluidizing gas velocity. The values of heat transfer coefficient in the pressured fluidized-bed combustor have been in the range of 370-720 W/m(2)K, which are much higher than those of typical value(200 W/m(2)K) in the atmospheric bubbling fluidized-bed combustor. The heat transfer coefficients have been well correlated in terms of operating parameters by way of dimensionless as well as dimensional forms.

Keywords

Heat Transfer Pressurized Fluidized Bed Anthracite Coal Combustion

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