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Title: An advanced energy-efficient coupled fluidized-bed system for recovering bitumen from tar sand
Authors: Seader, J.D.
Coronella, Charles J.
Issue Date: Apr-1991
Publisher: University of Kentucky, Institute for Mining and Minerals Research
Citation: Proceedings: 1990 Eastern Oil Shale Symposium; Oil shale, tar sands, heavy oil, pp. 120-129 (1991)
Type: Conference Publication
Pages: 12
Abstract: An advanced multiple-stage fluidized-bed reactor system has been devised for the energy-efficient extraction and conversion, from tar sand, of bitumen into synthetic crude oil. The reactor consists of four fluidized beds arranged as stages in series with respect to flow of sand. In the first stage, tar sands are heated, causing the bitumen to pyrolyze into coke, which is deposited on the sand, and gas, which is mostly condensed into oil. The coke is partially combusted with air or enriched oxygen in the second stage, which is thermally coupied to the first stage by multiple vertical heat pipes. Combustion is completed adiabatically in the third stage and heat recovery from the sand is carried out in the fourth stage. By conducting the coke combustion in two stages in this manner, the overall reactor residence time to produce ciean sand is greatly reduced from that for a single combustion stage. Laboratory experimental studies in 2.157- and 4.260-inch diameter fluidized-bed reactors have confirmed the ability to operate and control the two thermally coupled stages. To reliably and efficiently scale up and optimize the process, a mathematical model and computer simulation is being developed. The two-phase bubbling-bed model of Grace (1984), amended to account for bubble growth in the axial direction, has been adopted to model the mass transfer and fluid mechanics of the fluidized beds, while heat transfer is modelled by the empirical correlation of Wender and Cooper (1958). The model for the first and second combustion stages is complete. Predictions for exit reactor conditions at various operating conditions are in reasonable agreement with experimental observations. The operating parameters have been found to exert a much greater influence on the predictions of the model than do the vaiues of the physical parameters, indicating a desirable degree of reactor stability. Extension of the model to the pyrolysis and heat-recovery stages will permit the optimization of the reactor configuration ana operating conditions. This will be followed by experimental verification.
URI: http://hdl.handle.net/123456789/11107
Appears in Collections:ICSE Digital Library

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