Process for improving a vapourisation technique

摘要

A process and a corresponding apparatus for improving the efficiency of an evaporation process are characterised in that by simulating the boiling process the advantages of negative pressure evaporation and steam compression are combined in a mode of operation similar to that of a heat pump. As illustrated in figure 1, a gas or gas mixture is compressed (3, 4) and pressed through a porous bottom (10) in the form of bubbles into the bottom of the liquid column, is aspirated at its surface, dried by compression and/or cooling and recirculated. The thus obtained energy balance makes it seem possible to cover most heat transport and transfer losses with the power dissipated by the compressor (3), in so far as the thus designed plant is correctly optimised. The plant was developed to solve the problems found in a desalinisation plant, but can be used for all concentration and evaporation processes. In the illustrated model, both fresh water and brine can be used.