Item – Theses Canada

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OCLC number
1006984750
Link(s) to full text
LAC copy
LAC copy
Author
McQueen, Mark,1976-
Title
Heat recovery from molten blast furnace slag in a fluidized bed.
Degree
M. Sc. -- Queen's University, 2001
Publisher
Ottawa : National Library of Canada = Bibliothèque nationale du Canada, [2001]
Description
2 microfiches
Notes
Includes bibliographical references.
Abstract
A method for heat recovery from molten blast furnace slag was investigated using a fluidized bed and a molten LiCl-KCl salt mixture with eutectic composition, which acted as a low temperature analogue of the slag. The amount of energy contained within the blast furnace slag is approximately 3% of the total energy requirement of an integrated steel mill. The recovery of this energy can reduce fuel costs and decrease the amount of carbon dioxide released. The effects of air flowrate, molten salt feedrate, and bed mass on the heat transfer characteristics of the fluidized bed were studied. Convective gas to particle heat transfer coefficients were measured in the fluidized bed and found to be in the range of 360 to 730 W/m2K. The heat recovery efficiency ranged from 65 to 82%. These values were confirmed by a heat transfer modeling program written in Microsoft Excel. In addition, the model predicted the effect of various feed and bed properties. Particle growth and agglomeration caused significant temporal changes in the bed properties, which affected the heat transfer and the bed operation. It was found that the molten salt feedrate and the mass of the fluidized bed did not directly affect heat transfer; rather these variables altered the regime of fluidization, which in turn influenced both the operation of the bed and the heat transfer processes within it. These considerations which were not modeled, were responsible for the discrepancy between the model prediction and the experimental work.
ISBN
0612559181
9780612559189