Vakuum Konzentrationsanlage

摘要

In a vacuum concentrating plant, a feed liquid supplied (5,13) into a vacuum pan evaporator (3) is heated indirectly by a latent heat by introducing depressurized vapor into a steam jacket added to an outer periphery of a lower portion (4) 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 (20) by means of a heating source (33) 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 (38) 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 A concentrate as a product is withdrawn outside the circuit system through a concentrate withdrawing line (14) by an operation of a pump.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 DEG C or less.