DESALINATION APPARATUS AND METHOD OF DESALINATION

A desalination apparatus, and method of desalination, with which condensed water can be efficiently obtained while preventing scale deposition. Desalination apparatus (1) is one equipped with multiple-effect evaporation unit (2) having multiple evaporators capable of not only feeding a water to be treated to the external surface of heat transfer tube adapted to cause steam to pass through the interior thereof to thereby produce steam and concentrated water from the water but also forming condensed water through condensation of steam in the heat transfer tube, the multiple evaporators (2a to 2t) interconnected so that the steam produced by anterior-stage evaporator is led into the interior of heat transfer tube of posterior-stage evaporator as heat source, wherein the multiple evaporators (2a to 2t) are divided into multiple evaporator groups (3A to 3E) along the direction from the anterior stage side to the posterior stage side, and wherein there are provided scale component removing means (5) for removing at least portion of the scale component in raw water to thereby produce descaled water; mixed water feeding means (6) for feeding a mixed water consisting of a mixture of raw water and descaled water as a water to be treated to the heat transfer tube of each of the evaporators (2a to 2d) of the first evaporator group (3A) disposed on the most anterior stage side among the multiple evaporator groups (3A to 3E); and dilution water feeding means (7) for feeding a dilution water consisting of a mixture of concentrated water and mixed water as a water to be treated to the heat transfer tube of each of the evaporators (2e to 2h) of the second evaporator group (3B) disposed on one low temperature side among the first evaporator group (3A).