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석탄유동층 연소로의 열전달 특성
Heat Transfer Characteristics of a Fluidized Bed Coal Combustor
HWAHAK KONGHAK, June 1985, 23(3), 153-160(8), NONE
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Abstract
시험공장（pilot plant）규모인 25.4 cm 직경 5.85 m 높이의 유동층 연소로에서 국내 저질 무연탄(3400 Kcal/kg)으로 대기압하에서 연소 실험을 수행하였다. 석탄 입자의 평균크기를 0.49와 0.62 mm로 변화시키고 연소온도를 750∼950 ℃ 범위에서 변화시켰고, 공기유속을 23∼76 cm/s 범위에서 변화시켜 가면서 유동층내와 freeboard에 설치된 열전달관 사이의 열전달계수, 축방향 온도분포 및 석탄연소 효율에 미치는 영향을 규명하였다.
실험결과 열전달 계수는 공기유속에 따라 증가하여서 최대치를 보이고 감소하며 유동층온도가 증가함에 따라 증가하는 반면 입자크기가 증가하면 감소하였다. 유동층내의 축방향 온도 분포는 공기유속이 증가할수록 균일하여지며 연소효율은 공기유속이 증가하면 감소하는 반면 유동층 온도가 증가함에 따라 증가하였다.
실험결과 열전달 계수는 공기유속에 따라 증가하여서 최대치를 보이고 감소하며 유동층온도가 증가함에 따라 증가하는 반면 입자크기가 증가하면 감소하였다. 유동층내의 축방향 온도 분포는 공기유속이 증가할수록 균일하여지며 연소효율은 공기유속이 증가하면 감소하는 반면 유동층 온도가 증가함에 따라 증가하였다.
In a cylindrical fluidized bed combustor-pilot plant （25.4 cm-diameter×5.85 m-height）, combustion experiments were carried out with the domestic high ash content anthracite (3400 Kcal/Kg) coal.
The effects of coal mean size （0.49, 0.62 mm）, air velocity (23-76 cm/s) and bed temperature (750-950 ℃) on heat transfer coefficients between either fluidized bed, free-board and vertically immersed cooling tubes, temperature profiles along the bed height and combustion efficiency have been determined. The heat transfer coefficient exhibited a maximum value with air velocity. However, it increased with bed temperature and decreased with particle size.
The temperature profiles along the bed height became flattened with increase of air velocity. Whereas, combustion efficiency decreased with air velocity but it increased with bed temperature.
The effects of coal mean size （0.49, 0.62 mm）, air velocity (23-76 cm/s) and bed temperature (750-950 ℃) on heat transfer coefficients between either fluidized bed, free-board and vertically immersed cooling tubes, temperature profiles along the bed height and combustion efficiency have been determined. The heat transfer coefficient exhibited a maximum value with air velocity. However, it increased with bed temperature and decreased with particle size.
The temperature profiles along the bed height became flattened with increase of air velocity. Whereas, combustion efficiency decreased with air velocity but it increased with bed temperature.
