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Heat Transfer Studies on Freeze Concentration of Salt Brines in a Liquid Solid Fluidized Bed Heat Exchanger

[+] Author Affiliations
B. A. Habib, M. M. Farid

University of Auckland, Auckland, New Zealand

Paper No. HT-FED2004-56798, pp. 765-773; 9 pages
doi:10.1115/HT-FED2004-56798
From:
  • ASME 2004 Heat Transfer/Fluids Engineering Summer Conference
  • Volume 4
  • Charlotte, North Carolina, USA, July 11–15, 2004
  • Conference Sponsors: Heat Transfer Division and Fluids Engineering Division
  • ISBN: 0-7918-4693-8 | eISBN: 0-7918-3740-8
  • Copyright © 2004 by ASME

abstract

Fluidized bed freeze concentration is a technology in which liquid solutions can be concentrated within a fluidized bed heat exchanger by preferential freezing of water out of the solution. Water forms an ice layer on the heat exchanger wall from where it is removed by the action of the fluidized bed on it. A double pipe fluidized bed heat exchanger was constructed which included a bed of 4×4 mm 304 stainless steel solid cylinders. Salt solutions (0–9.4 wt%) were used in the process to form ice, which could successfully be removed by the particles with bed porosity of 0.81–0.83. Freeze concentration effects were observed with continuous freezing point depression in these experiments. Coolants used in experiments were 34% ethylene glycol solution and a potassium formate solution. The respective overall heat transfer coefficients were ∼600 W/m2 K with ethylene glycol and ∼1000 W/m2 K with potassium formate solution (Tyfoxit).

Copyright © 2004 by ASME

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