| 摘要 |
A plant for seawater desalination comprises a vapour separation chamber (2) situated at an altitude of 6 to 10, preferably 8 to 10 meters above seawater level (Y) and connected to a vacuum pump (8) for evacuating non-condensable gases from the chamber. A delivery pipe (1a, 1b) extends from below the sea surface to the chamber from whence a return pipe (4a, 4b) extends back to below the sea surface. A solar collector (3) is coupled into the delivery pipe to supply necessary evaporation heat to the liquid flow and to control the liquid flows in the plant. Water vapour separated in the chamber (2) is condensed by heat exchange with cold seawater, possibly by means of a heat exchanger (6) in the delivery pipe. A shunt pipe (9) can be coupled between the delivery and return pipes for recirculating a part of the return flow from the chamber. A second solar collector (10) can be connected to the delivery pipe upstream of the shunt pipe connection to the delivery pipe (1a, 1b), to control recirculation of water from the return pipe (4a, 4b) in response to the salt content of the return water so that the plant automatically limits the salt content of the water in the plant. |
