Transactions of the Korean Society of Mechanical Engineers B (대한기계학회논문집B)
- Volume 21 Issue 6
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- Pages.747-757
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- 1997
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- 1226-4881(pISSN)
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- 2288-5324(eISSN)
DOI QR Code
Analysis on the fuel concentration distribution in a fluidized bed for the scale-up of a FBC
유동층 연소로의 스케일-업을 위한 유동층 내 연료농도분포 해석
- Lee, Dong-U (Dept. of Mechanical Engineering, Graduate school of Hongik University) ;
- Park, Seung-Ho
- Published : 1997.06.01
Abstract
A numerical investigation of the fuel concentration field in a fluidized bed has been carried out for the scale-up of a fluidized bed combustor (FBC). A two-dimensional transient model is developed using the two-phase fluidization, a simple chemical reaction, and lateral solid mixing theories. The uniformity of fuel concentration distributions is controlled by the location and the number of fuel feeders, fluidizing velocities and the bed-heights. While larger bubbles owing to greater fluidizing velocities enhance the fuel-dispersion in the bed, they have adverse effects on fuel combustion and thus result in the increase of fuel concentration, since a greater bubble means a larger bypass which reduces gas-exchange rates between bubble and emulsion phases. Average or maximum values of the bed fuel concentration are utilized as criteria for the scale-up from a pilot/lab-scale to a commercial-size bed.