METHOD AND APPARATUS FOR SEWAGE DESALINATION BY MULTI-EFFECT DISTILLATION AND VAPOR THERMOCOMPRESSION OPERATING WITH DIFFERENT MOTOR STEAM PRESSURES

摘要

The invention relates to a plant for desalinating sea water by multi-effect distillation (MED) with thermo-vapor compression (TVC) to be coupled to a thermal power plant, comprising a series of distillation cells (A, B, C, D, E) each operating at a temperature and a pressure that are lower than those of the preceding effect, and comprising a thermocompressing means enabling the compression of a portion of the water vapor emitted by one of the effects (E) and the reinjection into the first effect (A). The invention is characterized by the fact that the thermocompressing means (6) is designed in such a manner that it can operate alternately at two different live vapor VM pressures. The invention also relates to a method for desalinating sea water while using a plant of the aforementioned type.