Seawater desalination method using heat supplied by steam heat pump, and system thereof

Abstract

The invention provides a seawater desalination method using heat supplied by a steam heat pump, and a system thereof. A steam booster is used to compress seawater vaporization steam, and pressurized and heated hot steam is used to heat seawater, and then is condensed to form distilled water freshwater; and the heated seawater vaporization steam is compressed again and then is condensed to form thedistilled water freshwater, and above processes are cycled. The theory of the method is characterized in that electric energy consumed during the compression of the steam booster firstly increases the effective energy of the pressurized steam and then is used for offsetting the effective energy consumed in the seawater preheating and seawater evaporation heat transfer processes. The system includes the steam booster, a boiler, an evaporation-condensation heat exchanger, a seawater feed water preheater, a seawater cooler, a seawater booster pump, a brine pump, a freshwater pump, a boiler waterfeeding pump, a circulating pump, and a signal test and control systems; and initial hot steam in the initial running stage of the system is supplied by the boiler. The running cost is several timeslower than that of multi-effect distillation seawater desalination methods using a self-contained boiler to generate steam in the whole course.

Description

technical field [0001] The invention relates to the field of seawater desalination and heat pump, and is a crossover technology combining steam heat pump and seawater desalination. Background technique [0002] Islands, ships, warships, and coastal water-scarce cities need fresh water and can rely on seawater desalination to solve it. For countries such as Israel that are short of water by the sea, 50% of the fresh water they need comes from seawater desalination. At present, there are two main methods for seawater desalination, one is the reverse osmosis membrane method, and the other is the distillation method; the distillation method is divided into high-temperature multi-effect distillation method and low-temperature multi-effect distillation method; It is a high-pressure pump that allows fresh water in seawater to permeate the fresh water side of the isolation membrane. It is produced on a large scale and consumes low power costs. The key technology is the material of ...

AI Technical Summary

Problems solved by technology

This kind of seawater desalination equipment is bulky and consumes too much power, so it is not suitable for many islands, fishing boats, and warships

In addition, solar desalination equipment has low efficiency and is unstable due to the weather, which cannot guarantee the stable demand for fresh water by the military and civilians on islands and other places.

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