Seawater desalting method and device

Abstract

The invention discloses a seawater desalting method and a seawater desalting device. Wind power is used as a working power supply in the method; the heated purified water is fed into a heat storage tank, and heat is circularly supplied by two paths; one path of hot water enters a first effect of a multi-effect distilled seawater desalting device and is used as a seawater desalting heat source, and enters the heat storage tank after heat release; the other path of hot water enters a pre-heater of the first effect of the multi-effect distilled seawater desalting device to a pre-heater of the last effect in turn, and flows back to the heat storage tank after pre-heating the seawater; after the seawater in a first effect evaporation chamber is evaporated in a falling film tube, the obtained thick seawater is led out, and the generated steam enters a second effect falling film tube and is used as a seawater evaporation heat source; the seawater flowing out from the next effect evaporation chamber is heated by the previous pre-heater and then enters the previous effect evaporation chamber; and the condensed steam generated by the last effect evaporation chamber is used as produced fresh water for discharge. The device is suitable for the seawater desalting method, and mainly comprises a solar heat collecting system, a seawater pre-heating system, a multi-effect distilled seawater desalting system and a heat pump system.

Description

technical field [0001] The invention relates to seawater desalination technology, in particular to a seawater desalination method and device for combined multi-effect distillation using solar energy and wind energy. Background technique [0002] The shortage of fresh water resources has become a major problem facing mankind. According to the United Nations, by 2025, nearly one-third of the world's population will live in areas with severe water scarcity. This has prompted many countries to invest a lot of manpower and material resources in the research of seawater desalination technology. At present, seawater desalination mainly includes thermal method and membrane method. For large-scale desalination plants, the cost depends largely on the cost of consuming electricity and steam. In order to reduce production costs, all-natural seawater desalination devices have been developed, but these devices are mostly used in islands and remote areas, and it is difficult to form lar...

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Problems solved by technology

However, it uses the steam obtained by evaporating fresh water as the heat source of the seawater desalination device, which increases the complexity of the system, and introduces the desalination product water into the heat pump evaporator, the product water is small, and the heat that can be provided is limited. water production rate

Chinese patent CN100999340A also discloses a multi-stage flash wind power seawater desalination device, which uses a heat pump for the multi-stage flash seawater desalination device, but each stage is heated by a heat pump, the structure is complex, and a high-power heat pump is used as a working heat source , increasing energy consumption and cost

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