Vacuum concentrating plant
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United States of America Patent
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May 23, 1995
Grant Date -
N/A
app pub date -
Jun 14, 1994
filing date -
Jun 29, 1993
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a vacuum concentrating plant, a feed liquid supplied into a vacuum pan evaporator is heated indirectly by a latent heat by introducing depressurized vapor into a steam jacket added to an outer periphery of a lower portion of the vacuum pan evaporator. In this manner, the feed liquid in the vacuum pan evaporator is boiled and concentrated in a concentrating zone within the vacuum evaporator. The depressurized vapor used for heating the feed liquid is obtained by heating water in a depressurized vapor generator by means of a heating source in a heat pump. On the other hand, the vapor generated in the vacuum evaporator is cooled and condensed in a vapor condenser by means of a cooling source in the heat pump and removed in the form of a drain outside a circuit system. A concentrate as a product is withdrawn outside the circuit system through a concentrate withdrawing line by an operation of a pump. Thus, in this vacuum concentrating plant, it is possible to provide a high heat efficiency, an excellent stability of the operation and a low running cost by a combination of the vacuum pan evaporator, the depressurized vapor generator and the heat pump. Further, it is possible to concentrate the feed liquid at a low temperature of 60.degree. C. or less.
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