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유동층 연소로에서 국내 저열량 무연탄의 마모특성
Attrition Characteristics of Domestic Low Grade Antracite Coal in a Fluidized Bed Combustor
HWAHAK KONGHAK, June 1990, 28(3), 320-326(7), NONE
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Abstract
Bench-scale 유동층 연소로에서 국내 저열량 무연탄의 마모특성을 고찰하였다. 조업변수로서 과잉기체속도(U-Umf), 유동층 온도, 과잉공기율이 적용되었으며 주요 마모특성으로서 입도분포, 성분분석, 탁소마모율, 탄소마모유출비 등을 측정 및 고찰하였다. 실험결과 마모에 의한 탄소유출은 공급된 탄소량의 5-15%에 달하며 과잉기체속도에 비례하고 유동층 온도 및 과잉공기율에 반비례하는 것으로 나타났다. 또한 국내 저열량 무연탄은 반응성(reactivity)이 낮아 비교적 높은 유동층내 carbon load를 갖게 되므로 다른 탄종에 비해 높은 탄소마모를 보았으며, 탄소마모유출비는 다음과 같은 상관식으로 표시되었다. Yea=38.05+13.20(U-Umf)-0.04(Tb)-6.79(Xe)
Attrition characteristics of domestic low grade anthracite coal have been studied in a bench-scale fluid-ized bed combustor. As operating variables, excess gas velocity(U-Umf), bed temperature, and excess air ratio were ap-plied. Attrition characteristics such as carbon attrition rate, ratio of elutriated attrited carbon to feed carbon, as well as analysis of compositions and size distributions of coals and ashes were investigated. The experimental results show that the carbon elutriation due to attrition is in the range of 5-15% of the feed carbon, increases with the excess gas velocity, and decreases with increasing bed temperature and excess air ratio. Also, the carbon attrition rate of domestic low grade anthracite coal is shown to be greater than that of other type of coals because of the higher in-bed carbon load resulting from their lower reactivity. The following correlation has been suggested for the ratio of elutriated attrited carbon to feed carbon._x000D_
Yea=38.05+13.20(U-Umf)00.04(Tb)-6.79(Xe)
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Chirone R, D'Amore M, Massimilla L, Mazza A, AIChE J., 31(5), 812 (1985)
Kono H, AIChE Symp. Ser., 77(205), 96 (1981)
Merrick D, Highley J, AIChE Symp. Ser., 70(137), 366 (1974)
Donsi G, Massimilla L, Miccio M, Combust. Flame, 41, 57 (1981)
Donsi G, Massimilla L, Miccio M, "The Elutriation of Solid Carbon from a Fluidized Bed Combustor," Riv. Combustion, CNR Naples Italy, Vol. 34, 336 (1980)
Arena U, AIChE J., 29(1), 40 (1983)
Arena U, Chirone R, D'Amore M, Massimilla L, Combust. Flame, 57, 123 (1984)
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Chen TP, Sishtla CI, Punwani DV, Arastoopour H, "A Model for Attrition in Fluidized Beds," Proc. of the 4th Int. Conf. on Fluidization, 445 (1980)
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