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Abstract

A system and a method for separating water and salt by sequential evaporation of multiple groups of heat collecting devices. The system comprises heat collectors, a light-gathering heat collector, a heating chamber, an evaporation chamber, a condenser, a buffer chamber and a vacuum pump; a saline water stock solution is rapidly heated by multiple series-connected-multiple groups of parallel solar heat collecting devices and series-connected light-gathering heat collectors with decreasing water levels, and the water levels control water inlet and the temperature controls water outlet; several groups are started up in turn to perform micro-negative pressure evaporation, while other groups provide phase change heat energy, and the buffer chamber collects concentrated saline water; natural convection heat exchange occurs between the saline water stock solution and a vapor manifold, vapor heat energy is recovered and condensed fresh water is produced.

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First Claim