Heat exchange – Intermediate fluent heat exchange material receiving and... – Solid fluent heat exchange material
Patent
1989-10-13
1991-01-15
Davis, Jr., Albert W.
Heat exchange
Intermediate fluent heat exchange material receiving and...
Solid fluent heat exchange material
141 1, 422145, 422146, F28D 312
Patent
active
049846248
ABSTRACT:
Installations for operating physical and/or chemical processes, for example heat exchangers, comprising a bundle of parallel vertical tubes which, via tube plates, are in open connection with a bottom header and a top header, are known to operate with a granular mass maintained in a steady or quasi-steady fluidized state, at least in the tubes, by means of a medium flowing upwards through the headers and tubes. At start-up and shut-down of such installations problems are encountered because the granular mass tends to settle to form a packed bed, in particular if the upwardly flowing medium may contain solid impurities or has a rather high viscosity. The invention solves such problems by using a storage vessel, to which the granular mass is flushed at shut-down of the installation, a partial stream of the flowing medium being first fed through the tubes at start-up, after which the granular mass is flushed from the storage vessel to the tubes and only thereafter the main stream of medium is fed to the tubes. At shut-down said main stream is first reduced and then the granular mass is flushed back to the storage vessel and thereafter the partial stream of the medium is shut off.
REFERENCES:
patent: 4022255 (1977-05-01), Pegels et al.
patent: 4119139 (1978-10-01), Klaren
patent: 4220193 (1980-09-01), Klaren
Davis Jr. Albert W.
Eskla B.V.
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