Method of switching refrigerating medium unit to drive multiple icing desalting tanks

Abstract

The invention discloses a method of switching a refrigerating medium unit to drive multiple icing desalting tanks. The refrigerating medium unit is switched to drive circulation of icing, separating,concentrating and de-icing of the icing desalting tanks and extracts icing cold of a group of cold-heat calandria to provide de-icing heat for another group of cold-heat calandria so as to realize heat balance inside a device; through alternate icing and de-icing, icing and gravity stratifying double separation effect and up-down synchronous freezing formed by the cold-heat calandrias incoming from bottom and outgoing from top, material liquid concentration and fresh water preparation are realized. Cold can be recycled and discharged in a centralized manner by a fresh water coiler and a concentrated liquid coiler, condensing heat can be discharged along with fresh water, and ambient cold can be absorbed by a heat exchanger.

Description

1. Technical field [0001] The invention relates to a multi-set icing desalination pond driven by switching of a refrigerant set, which uses the principle of freezing to concentrate brine, and can be widely used in seawater desalination, food processing, beverage production, sewage treatment, water purification treatment, reclaimed water treatment, Chemical industry, household water purification, commercial water purification and other technical fields. 2. Background technology [0002] Frozen seawater desalination device: When seawater is frozen and frozen, the fresh water floats up and stratifies with the concentrated brine according to gravity, freezes, and then melts the ice layer into fresh water to realize seawater desalination. Freezing seawater desalination devices can be divided into two types: natural freezing method and artificial freezing method, both of which are under research. [0003] The advantages of the freezing seawater desalination device are as follows:...

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Problems solved by technology

[0005] However, the disadvantages of the refrigeration seawater desalination device also restrict its further application:

[0006] 1. It is difficult to recover latent heat of icing, latent heat of ice melting, sensible heat of taking fresh water and discharging salt water, so that the driving cooling capacity of the device is as high as 93kW*h / t, and the driving power consumption of the device is as high as 47kW*h / t;

[0007] 2. Since the driving power consumption per ton of fresh water of the device is 47kW*h / t, which is 4 times that of the seawater desalination device of the pressure steam distillation method, it limits the improvement of its economy and the shortening of the payback period;

[0008] 3. The freezing seawater desalination device is a large-scale industrial refrigeration equipment, and it is difficult to realize miniaturization and home appliance

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