SEAWATER DESALINATION DEVICE AND SEAWATER DESALINATION METHOD

摘要

Provided are a seawater desalination device and a seawater desalination method based on an evaporation method, in which an self-heat recuperation process is used to reduce an amount of necessary energy in half or less, compared with the conventional multi-stage flash method. Specifically, using a three-phase fluidized bed allows a highly heat-efficient operation, while preventing scaling to a heat-transmitting surface, even in a high salinity concentration. This seawater desalination device (1) includes a steam re-compressor (3) capable of pressurizing steam by pressurizing a steam; a first heat exchanger (5) capable of exchanging amount of sensible heat of seawater to be desalinated with amount of liquid sensible heat after pressurized steam is condensed, and amount of sensible heat of a concentrated liquid after seawater is concentrated; a second heat exchanger (7) capable of exchanging amount of heat of pressurized steam, amount of latent heat of vaporization of seawater, and amount of sensible heat when seawater is evaporated, as well as capable of concentrating seawater; a seawater supply means (17); a steam supply means (13); a first discharge means (21); a second discharge means (23); and a water-droplet separation means (25).