Distillation: apparatus – Apparatus – Systems
Patent
1975-01-23
1976-05-04
Sofer, Jack
Distillation: apparatus
Apparatus
Systems
203 75, 203 82, 203 88, 203 90, 159DIG17, B01D 300, B01D 306
Patent
active
039545660
ABSTRACT:
An improved arrangement is described for self-controlling the evaporation rate in the first stage of a two-stage expansion type evaporation installation for radio-active liquid purification, as described e.g. in the U.S. patent application Ser. No. 328065 filed on Jan. 30, 1973, in case of failure of the main circulating pump of the second stage. Such failure causes a pressure drop at the mixing condenser between first and second stage and normally, thus, a pressure drop in the first stage too. Such pressure drop leads to unwanted evaporation in the first stage and transfer to the second stage of excessive and insufficiently purified fluid from the first stage. A flow throttle element such as a diaphragm or a necked-down section of steam conduit is interposed between the vapor exit of the first stage and the mixing condenser in which the vapor is condensed by contact with a portion of the liquid from the second stage circulated therethrough by the pump. Any tendency of the amount of liquid evaporating in the first stage to unduly increase due to a pressure drop caused by pump failure of the second stage results in a corresponding increase of the pressure difference across the flow throttle element so that the pressure in the first stage does not decrease by the same amount as in the mixing condenser, thus preventing undue increase of the evaporation rate in the first stage.
REFERENCES:
patent: 3250313 (1966-05-01), Irvin
patent: 3607663 (1971-09-01), Vandenberg
Sofer Jack
Vereinigte Edelstahlwerke AG
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