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Method and system for preparing fresh water by utilizing temperature difference between seawater and fresh water condensation

A seawater and freshwater technology, applied in seawater treatment, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of high cost, high price of reverse osmosis membrane materials, large consumption of consumables, etc., and achieve long service life of consumables, Suitable for large-scale promotion and application, and the effect of large amount of fresh water preparation

Active Publication Date: 2019-04-09
HONGMEN ADVANCED TECH CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The material of the reverse osmosis membrane used in this method is relatively expensive, and the osmosis membrane is easily blocked when it is directly used in seawater with a salinity of 15-25, resulting in a large consumption of consumables, resulting in high cost

Method used

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  • Method and system for preparing fresh water by utilizing temperature difference between seawater and fresh water condensation

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Effect test

Embodiment 1

[0049] The present invention is based on experiments that show that seawater and freshwater have different freezing points. Freshwater begins to freeze at 0°C, while saline seawater begins to freeze at -5°C. Therefore, the condensation temperatures of seawater and freshwater are also different. When seawater and freshwater When the fresh water reaches a certain temperature range, the fresh water reaches the condensation temperature before the sea water.

[0050] The specific steps of the method for preparing fresh water using the temperature difference between seawater and fresh water dew condensation of the present invention are as follows:

[0051] 1. Sea water heating

[0052] The present invention heats the seawater through the heat exchange heat energy of the refrigerating device, specifically, in this embodiment, as figure 1 As shown, the seawater is pumped into the seawater storage container 20 through the pipeline 11 connected to the seawater inlet by the water pump 1...

Embodiment 2

[0058] Steps 1 to 3 are the same as in Embodiment 1, the difference is that the second stage desalination treatment is added.

[0059] Fourth, the second stage desalination treatment

[0060] This step is used to further purify the fresh water that has undergone the first-stage desalination treatment, so that it becomes fresh water that meets drinking water standards with zero salinity.

[0061] In this step, the obtained fresh water is subjected to a second-stage desalination treatment through the second-stage desalination treatment device 70, and the fresh water is purified to meet drinking water standards with a salinity of zero. Specifically, such as figure 1 As shown, the obtained fresh water is sent to the reverse osmosis device 72 by the high-pressure water pump 71, and the fresh water with a salinity of 0.8 can be purified to a salinity of zero under the action of the reverse osmosis membrane. Then, the purified fresh water enters the activated carbon water filter 73...

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Abstract

The invention provides a method and system for preparing fresh water by using dew condensation temperature difference between seawater and fresh water. The method comprises the following steps: a, heating seawater to 45 to 65 DEG C by using heat exchange heat of a refrigeration apparatus; b, subjecting the heated seawater to primary desalination so as to form low-salinity fog; c, subjecting the low-salinity fog formed by primary desalination to low-temperature dew condensation in a range of 8 to 12 DEG C so as to allow fresh water molecules in the low-salinity fog to become dew through condensation and recovering powdery salt crystal formed uncondensed high-salinity fog; and d, carrying out secondary desalination with a reverse osmosis membrane and active carbon and purifying obtained fresh water until fresh water meets drinking water standards. The system comprises a water pump, a seawater storage container, a seawater heating container, an ultrasonic atomizer, the refrigeration apparatus, a fan and a secondary desalination apparatus. The method provided by the invention has the advantages that energy consumed in the process of seawater desalination is low; the service life of consumables is long; the amount of prepared fresh water is great; secondary pollution is not posed to the marine environment; maintenance cost is low; and the method is suitable for large-scale application.

Description

【Technical field】 [0001] The invention relates to seawater desalination, in particular to a method and system for preparing freshwater by utilizing the dew condensation temperature difference between seawater and freshwater, which saves energy and consumables, has a large amount of freshwater preparation, and is low in maintenance costs, and is suitable for widespread application. 【Background technique】 [0002] As we all know, fresh water is an important resource for human life. my country's fresh water resources are poor, not only the per capita possession is small, but also unevenly distributed in time and region. In recent years, with the rapid economic growth, coupled with the low annual rainfall and the serious pollution of many water sources, the contradiction between supply and demand of fresh water has become increasingly prominent. Statistics show that among the 610 cities above the medium level in my country, more than 400 are short of water to varying degrees, a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/10C02F1/04C02F1/44C02F1/52
CPCC02F1/04C02F1/441C02F1/52C02F9/00C02F2001/5218C02F2103/08Y02A20/124Y02A20/131
Inventor 余家红
Owner HONGMEN ADVANCED TECH CORP
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