Abstract
The scale inhibiting capability of a fluidized bed in the vertical heat exchanger tubes of a MSF/FBE was investigated. In all experiments the calcium sulfate hemihydrate solubility line could be exceeded to a certain extent without scale deposition. At concentration factors of sea water larger than 2.5 hemihydrate was found, while at lower concentration factors anhydrite was deposited. The highest top temperatures were reached when the brine was deaerated and recirculation of seeding crystals was excluded. Scale deposition is prevented more efficiently by 2 or 3 mm glass particles than by 1 mm glass particles. A model is given to describe the competitive processes of scaling and abrasion at the wall of the heat exchanger tubes. Both processes were studied separately: the removal rate of calcium sulfate crystals by abrasion tests and experiments in an scaled up fluidized bed; the growth rate of calcium sulfate by experiments in a high temperature rotating disc reactor.
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