Journal
INTERNATIONAL JOURNAL OF MULTIPHASE FLOW
Volume 49, Issue -, Pages 78-82Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijmultiphaseflow.2012.10.005
Keywords
Supercritical water; Fluidized bed; Frictional pressure drop; Minimum fluidization velocity
Categories
Funding
- National Natural Science Foundation of China [50906069]
- National Key Project for Basic Research of China (973 program) [2009CB220000]
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Supercritical water fluidized bed is a new reactor concept for biomass gasification. In this paper, an experimental study on the hydrodynamics of a supercritical water fluidized bed was conducted. The frictional pressure drops of a fixed bed and a fluidized bed were measured for a temperature ranging from 633 to 693 K and pressure ranging from 23 to 27 MPa. The results show that the Ergun formula for calculating the frictional pressure drop of a fixed bed can still be applied in supercritical water conditions. The average deviation between Ergun formula and experiment results is 13.3%. A predicting correlation for the minimum fluidization velocity in a supercritical water fluidized bed was obtained based on the experimental results of a fixed bed and the fluidized bed pressure drop. The average error between the correlation and experiment results was about 3.1%. The results in this paper are useful for the design of SCW fluidized bed. (C) 2012 Elsevier Ltd. All rights reserved.
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