Natural vacuum low temperature distillation sea water desalination method and device

Abstract

The invention relates to a seawater desalination method and device of natural vacuum and low temperature distillation, which is characterized in that the system must be airtight before operation, the water injection valve on the system top is switched on to fill up the system with seawater; the drain valves of all drainage pipes connected with the evaporation chamber are switched on, then the seawater is flowed out under the influence of the gravity; the air in the system is discharged to make the system vacuum; the heat source can be conveyed to the evaporation chamber now; when the temperature of heat source is higher than the condensation temperature, the evaporation pressure of the heated seawater is higher than the condensation temperature of fresh water, the evaporated vapor is condensed by the condenser under the action of pressure difference between the evaporation pressure and the condensing pressure and finally the desalinated water can be obtained. The invention has the advantages that a sleeve regenerator is arranged on the connection section of the water supply pipe of seawater and the evaporation chamber, the heat of the strong brine discharged by the evaporator is partially adopted to preheat the seawater in the evaporator, the liquid in the system can flow freely due to the pressure difference, thus the method can economize energy source and the device can be used to desalinate the seawater on any sea island, water-deficient area or brackish water area.

Description

technical field [0001] The present invention relates to a low-temperature distillation seawater desalination method and device used in the field of seawater desalination, in particular to the use of low-temperature heat sources such as solar energy for heating, and the use of water gravity and atmospheric pressure to generate vacuum and pressure difference naturally without any pumps. Distillation seawater desalination unit. Background technique [0002] Seawater desalination has played an important role in the economic and social development of some coastal water-scarce countries and regions. For example, 70% of Israel’s drinking water comes from desalinated seawater, and the daily desalinated water production in 2005 reached 738,000 cubic meters; the UAE’s drinking water mainly relies on seawater desalination, and the daily desalinated water production in 2003 reached 5.466 million cubic meters; Sicily, Italy , In 2005, the daily output of desalinated water was 135,000 cu...

AI Technical Summary

Problems solved by technology

Although the use of all natural energy is realized, the pumping system is powered by a wind power generation system, so the cost per ton of fresh water for the system is high

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