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HWAHAK KONGHAK,
Vol.31, No.3, 287-294, 1993
Vol.31, No.3, 287-294, 1993
석탄 유동층 연소로 내 수벽전열관의 열전달 특성
Heat Transfer Characteristics of Membrane Water Wall in a Fluidized Bed Coal Combustor
파이롯트 규모의 유동층 연소로에서 수벽전열관（membrane water wall）의 열전달 특성을 고찰하였다. 조업변수로서 유동화속도(2.2-3.2 m/s), 유동층온도(800-960℃)등이 적용되었으며, 주요 열전달 특성으로서 경막 전열계수(individual heat transfer coefficient), 열전달율(heat flux)이 측정 및 고찰되었다. 실험결과 유동층영역 내 수벽전열관의 열전달계수는 유동층온도에 비례하고 유동화속도에 따라 최대값과 함께 증감현상을 보였으며 일반 수평, 수직전열관에 비해 다소 낮은 값을 보였다. Freeboard영역 내 수벽전열관의 열전달계수는 유동층내 전열관의 30-40%에 해당되는 낮은 값을 가지며, 유동화속도 및 유동층온도가 증가할수록 증가하였다.
Heat transfer characteristics of membrane water wall have been determined in a pilot-scale fluidized bed coal combustor. The effects of fluidizing velocity（2.2-3.2 m/s） and bed temperature(800-960℃) on individual heat transfer coefficient and heat flux have been determined. The heat transfer coefficients of the in-bed membrane water wall increase with bed temperature, while it exhibits a maximum value with fluidizing gas velocity. Also, the heat transfer coefficients of membrane water wall were slightly lower than those of typical horizontal and vertical tube located in a fluidized bed. The heat transfer coefficients of free-board membrane water wall appeared to be 30-40% of those of in-bed membrane water wall and they increase with fluidizing velocity and bed temperature.
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[Cited By]
- Kang SH, Han KH, Jin GT, Kang Y, HWAHAK KONGHAK, 40(2), 218, 2002
- Shun D, Bae DH, Han KH, Cho SH, Lee SY, HWAHAK KONGHAK, 40(3), 345, 2002
- Park YS, Ghim YS, Son JE, Maeng KS, HWAHAK KONGHAK, 32(1), 18, 1994
- Kang SH, Kang Y, Jin GT, Yi CG, Han KH, Journal of the Korean Industrial and Engineering Chemistry, 14(4), 475, 2003
- Kang SH, Son SM, Kang Y, Bae JW, Jun KW, Korean Journal of Chemical Engineering, 25(4), 897, 2008
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