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저질탄 활용을 위한 유동층 기술(I)-유동층으로부터의 미세입자 유출-
Fluidized-Bed Technology for Utilization of Low Grade Coal(I)-Elutriation of Fines from a Fluidized-Bed-
HWAHAK KONGHAK, December 1985, 23(6), 431-439(9), NONE
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Abstract
유동층 연소로（6.8 cm ID × 135 cm Height）에서 연소시 입자마멸을 무시할 수 있는 저질탄을 사용하여 유동층으로부터의 미세입자 유출에 관한 실험을 수행하였다. 분쇄된 저질탄은 분산계수 85 %인 Rosin-Rammler분포를 가지며, 발열량은 약 2,000 Kcal/Kg이다.
유동층으로부터 미세입자 유출을 예견하기 위하여 지금까지 보고된 여러 상관관계들을 유동층 연소로에서 얻은 실험결과와를 비교하면 많은 차이를 보여주었다. 따라서 본 연구에서는 모래를 유동층으로 하여 실제 유동 연소로와 유사한 조건에서 유출에 관한 실험을 수행하여 보다 응용성있는 새로운 상관관계식을 제시하였으며 이는 실제 연소계에서 얻은 실험 결과와 잘 일치한다.
유동층으로부터 미세입자 유출을 예견하기 위하여 지금까지 보고된 여러 상관관계들을 유동층 연소로에서 얻은 실험결과와를 비교하면 많은 차이를 보여주었다. 따라서 본 연구에서는 모래를 유동층으로 하여 실제 유동 연소로와 유사한 조건에서 유출에 관한 실험을 수행하여 보다 응용성있는 새로운 상관관계식을 제시하였으며 이는 실제 연소계에서 얻은 실험 결과와 잘 일치한다.
Elutriation characteristics of coal fines from a fluidized bed is experimentally investigated in a 6.8 cm ID ×135 cm height fluidized bed combustor, using a low grade anthracite, which has heating value around 2,000 Kcal/Kg and negligible amount of attrition of particles during combustion. The particle size distribution resulting from grinding coal showed Rosin-Rammler distribution with a coefficient of variation 85 %.
It was also found that various existing correlations for predicting elutriation of fines from fluidized beds do not properly fit the real data which are obtained from the present study.
Finally, a correlation more applicable to actual systems is presented for the elutriation from fluidized bed by employing sand sample which is similar to real coal in particle size distribution of Rosin-Rammler.
Comparisons between the correlation and experimental data are in good agreement.
It was also found that various existing correlations for predicting elutriation of fines from fluidized beds do not properly fit the real data which are obtained from the present study.
Finally, a correlation more applicable to actual systems is presented for the elutriation from fluidized bed by employing sand sample which is similar to real coal in particle size distribution of Rosin-Rammler.
Comparisons between the correlation and experimental data are in good agreement.
