High temperature high efficiency multi-effect seawater distillation desalination apparatus and method

Abstract

The invention provides a high temperature high efficiency multi-effect seawater distillation desalination apparatus and a method. The apparatus mainly comprises a multi-effect evaporation condenser, a water spraying cooling screw vapor compressor, a generator of an absorption compression type heat pump, an absorber of the absorption compression type heat pump, and a solution cooling screw working medium compressor, wherein waste heat of strong brine and fresh water is recovered by using the absorption compression type heat pump to preheat seawater to achieve a temperature of more than 70 DEG C, a heat pump working medium solution concentration is adopted to control a preheat temperature of the feeding seawater, and parallel / forward flow mixed solution supply and the screw vapor compressor are matched to provide saturated heat source vapor with a temperature of more than 100 DEG C so as to increase efficiency and effluent rate of the desalination apparatus. According to the apparatus, the high pressure ratio (3-6) screw vapor compressor and the absorption compression type heat pump are introduced, and system operation is stable and reliable so as to achieve high temperature high efficiency seawater desalination, increase the number of the effect of multi-effect distillation desalination, reduce heat exchanger and compressors investment cost, improve seawater desalination rate and reduce unit fresh water energy consumption, such that an equipment investment recovery period is reduced, and unique business potential is provided.

Description

technical field [0001] The invention belongs to the technical fields of electromechanical, refrigeration and seawater desalination, and in particular relates to a mechanical compression multi-effect distillation seawater desalination device, in particular, using an absorption heat pump to recover concentrated brine and fresh water waste heat to preheat seawater to above 70°C, and adopting high-pressure ratio spraying water A device and method for desalinating seawater at a temperature above 100°C by cooling a twin-screw steam compressor saturated with exhaust gas. Background technique [0002] With the continuous growth of population and economic development, water resources are increasingly scarce, and seawater desalination technology has attracted much attention. Among the many seawater desalination methods, the mechanical vapor compression multi-effect distillation seawater desalination method has the most development potential and is also the fastest growing technology i...

AI Technical Summary

Problems solved by technology

Generally, the feed seawater, concentrated brine and fresh water are preheated and supplied directly. The temperature of the feed seawater cannot be effectively controlled. The feed seawater generally has not yet reached the corresponding saturation temperature. Part of the high-temperature steam heat in the evaporative condenser is used as the sensible heat of seawater. Reduced desalination rate

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