Method and device for desalinating sea water by jet flow-heating process

Abstract

The invention discloses a method and a device for desalinating sea water by a jet flow-heating process. The device comprises an evaporator, a condenser, a vapor distribution device, a water inlet system, a jet flow water distribution system, a circulating system, a fresh water system, a vacuum system, a non-condenser treatment system and a pump body system, wherein the evaporator is provided with the jet flow water distribution system and the vapor distribution system; the outlet of a jet flow water distribution device connected with the sea water inlet system is upward to spray sea water upwards; the jet flow water distribution device is provided with a water retaining plate, so that the water outflow of the jet flow water distribution device is distributed uniformly and forms an umbrella-shaped uniform water film layer; sea water is retained by the water retaining plate at the upper part of the jet flow water distribution device to form an umbrella-shaped water film. According to scientific technologies of heat transfer and fluid mechanics, sea water and vapor are in direct contact with each other completely, so that the heat transfer during sea water desalination is enhanced furthest, and therefore, the water production ratio of the system is raised, the energy consumption is lowered, and a high-efficiency energy-saving sea water desalinating technology is achieved.

Description

technical field [0001] The invention relates to the technical field of desalination of seawater, in particular to a method and system for desalination of seawater by jet-thermal method. Background technique [0002] Seawater desalination is mainly used in the separation technology of salt and water in seawater. Seawater desalination methods currently used include seawater freezing, electrodialysis, distillation, and reverse osmosis. Distillation is to turn seawater into steam. According to different steam cooling methods, it can be divided into multi-effect flash evaporation, multi-effect distillation and compression distillation. [0003] Jet-thermal seawater desalination technology is an improvement on low-temperature multi-effect seawater desalination technology. Low-temperature multi-effect seawater desalination refers to the desalination technology whose maximum evaporation temperature of brine is lower than 70°C. It is characterized by a series of falling film evapora...

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Problems solved by technology

[0004] The purpose of the present invention is to solve the problems of fouling and low heat transfer efficiency of the water distribution device in the existing thermal seawater desalination, and provide a long-term stable water distribution method and a high-efficiency heat transfer evaporation device to improve the overall cost of seawater desalination. water ratio

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