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순환 유동층의 수역학적 특성 및 석탄연소 특성
Hydrodynamics and Coal Combustion Characteristics of Circulating Fluidized Beds
HWAHAK KONGHAK, October 1984, 22(5), 253-258(6), NONE
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Abstract
순환유동층（7.8 cm -내경 × 250 cm-높이）내의 석탄-공기 계의 흐름특성을 실온에서 측정하였고, 석탄연소시의 연소효율과 유동층 높이에 따른 온도분포를 결정하였다.
발열량이 4.870 Kcal/kg인 국내 무연탄을 사용하여 흐름특성은 석탄의 평균입자경을 0.205, 0.395 및 0.71 mm로 바꾸어서 측정하였으며 석탄연소실험은 0.71 mm입자를 사용하였다.
기포층과 난류층 흐름의 경제속도（transition velocity） 및 난류유동층과 고속유동층의 경계속도인 수송속도(transport velocity)를 결정하였다.
난류유동층흐름에서의 석탄연소효율은 기포층흐름때 보다 높게 나타나며 낮은 온도에서도 쉽게 정상상태를 유지할 수 있었다.
석탄연소효율은 과잉공기량이 증가함에 따라 기포유동층 및 난류유동층에서 다같이 증가하며 난류유동층에서의 유동층높이에 따른 온도분포는 기포층유동층보다 더 균일하게 측정되었다.
발열량이 4.870 Kcal/kg인 국내 무연탄을 사용하여 흐름특성은 석탄의 평균입자경을 0.205, 0.395 및 0.71 mm로 바꾸어서 측정하였으며 석탄연소실험은 0.71 mm입자를 사용하였다.
기포층과 난류층 흐름의 경제속도（transition velocity） 및 난류유동층과 고속유동층의 경계속도인 수송속도(transport velocity)를 결정하였다.
난류유동층흐름에서의 석탄연소효율은 기포층흐름때 보다 높게 나타나며 낮은 온도에서도 쉽게 정상상태를 유지할 수 있었다.
석탄연소효율은 과잉공기량이 증가함에 따라 기포유동층 및 난류유동층에서 다같이 증가하며 난류유동층에서의 유동층높이에 따른 온도분포는 기포층유동층보다 더 균일하게 측정되었다.
In a circulating fluidized bed （7.8 cm-ID × 250 cm-high）, flow regimes of coal-air system at room temperature and coal combustion efficiency and temperature profiles along the bed height have been determined.
An anthracite domestic coal having heating value of 4,870 Kcal/Kg was employed. Coal particle sizes were varied 0.205, 0.395 and 0.71 mm for flow regime and 0.71 mm for coal combustion studies.
The transition velocity between bubbling and turbulent beds and the transport velocity between turbulent and fast beds have been determined.
In a circulating fluidized bed, combustion efficiency was higher in the turbulent bed than that in the bubbling bed. Steady combustion operation can be easily maintained at much lower temperature in the turbulent bed than in the bubbling bed.
An anthracite domestic coal having heating value of 4,870 Kcal/Kg was employed. Coal particle sizes were varied 0.205, 0.395 and 0.71 mm for flow regime and 0.71 mm for coal combustion studies.
The transition velocity between bubbling and turbulent beds and the transport velocity between turbulent and fast beds have been determined.
In a circulating fluidized bed, combustion efficiency was higher in the turbulent bed than that in the bubbling bed. Steady combustion operation can be easily maintained at much lower temperature in the turbulent bed than in the bubbling bed.
