Dual-heat-source seawater desalination system driven by supercritical CO2 heat pump

Abstract

The invention discloses a dual-heat-source seawater desalination system driven by a supercritical CO2 heat pump. A CO2 compressor is communicated to a first-effect first distiller; the first-effect first distiller is communicated to a vortex tube; a hot end outlet of the vortex tube is communicated to a first-effect second distiller; CO2 discharged from the first-effect second distiller is gathered in a cold end outlet of the vortex tube; the cold end outlet of the vortex tube is communicated to a first evaporator and a second evaporator; the first evaporator and the second evaporator are communicated to an air suction opening of the CO2 compressor; seawater passes through a steam condenser and a preheater , then enter the first-effect first distiller and is successively distilled by the first-effect first distiller, the first-effect second distiller and a second-effect distiller; steam outlets of the first-effect first and second distillers are communicated to the second-effect distiller; a steam outlet of the second-effect distiller is communicated to a steam inlet of the steam condenser; freshwater steam is condensed by the first evaporator; concentrated seawater is condensed by the second evaporator. The dual-heat-source seawater desalination system is efficient, energy-saving and environmentally friendly.

Description

Technical field [0001] The invention relates to a seawater desalination system, in particular to a supercritical CO 2 A dual heat source seawater desalination system driven by a heat pump. Background technique [0002] Freshwater resources are one of the most important basic substances for the survival and development of human society. However, the content of freshwater resources on the earth is less than 3% and most of them are difficult to use. With the development of industrial technology, the increase of population, the improvement of living standards and the increase of water pollution, the problem of insufficient fresh water has appeared in most parts of the world. Studies have shown that desalination is an effective way to solve the lack of freshwater resources. Seawater desalination technology is a technology that separates salt and water. There are currently more than ten methods, the most important of which include distillation and membrane methods. Distillation metho...

AI Technical Summary

Problems solved by technology

The above seawater desalination methods all need to consume a large amount of fossil energy and electricity, which aggravates the problems of global warming and environmental pollution.

For the thermal seawater desalination method, in order to reduce the operating cost of the seawater desalination system, the scale of the seawater desalination device is usually required to be large and rely on waste heat generated by thermal power plants as a heat source, which greatly limits the scope and practicability of this method

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