Brine desalting method and system

A brine and desalination technology, applied in the field of desalination system, method and its desalination system, to remove soluble inorganic salts in concentrated brine, can solve the problems of low water yield, high energy consumption, high treatment cost, etc., and achieve water conductivity The effect of low efficiency, low energy consumption and high salt removal rate

Active Publication Date: 2012-11-21
SHANDONG WEIFANG RAINBOW CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the common processes for desalination from wastewater or seawater include multiple-effect evaporation process, electrodialysis process and reverse osmosis process, etc. These methods all have disadvantages such as high treatment cost, high energy consumption, and low water yield.

Method used

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  • Brine desalting method and system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The low-temperature brine (with a salt content of 20%) obtained from 2,4-D production at 40°C enters the plate exchanger through a centrifugal pump, is heated to 80°C, and then enters an evaporator with a scraper (that is, a scraper evaporator, The same below) for spray evaporation, the water is evaporated instantly, the salt crystallization is scraped off by the scraper on the wall of the evaporator, and the scraped salt is output through the -0.15MPa air lock and the conveyor belt. The evaporated water vapor enters the compressor through the vacuum generated by the water ring vacuum pump, and the compressor compresses the lower-temperature water vapor into secondary steam at a temperature of 120°C, and the secondary steam enters the plate exchanger to provide heat energy for heating the low-temperature brine. The condensed water from the secondary steam enters the collection tank for recycling or further treatment.

[0029] According to the above steps, continue to ca...

Embodiment 2

[0032] The low-temperature brine (with a salt content of 13%) obtained from 2,4-D production at 30°C enters a heat pipe exchanger through a canned pump, is heated to 70°C, and then enters an evaporator with a scraper for spray evaporation. Evaporated instantaneously, the salt crystals are scraped off by scrapers on the wall of the evaporator, and the scraped salt is output through the -0.12Mpa air lock and conveyor belt. The evaporated water vapor enters the compressor through the vacuum generated by the water ring vacuum pump, and the compressor compresses the lower-temperature water vapor into secondary steam at a temperature of 110°C, and the secondary steam enters the heat pipe exchanger to provide heat energy for heating low-temperature brine , the water condensed from the secondary steam enters the collection tank for recycling or further treatment.

[0033] The purity of the salt output by the conveyor belt in this embodiment is 90.12%, the water content is 8.66%, and t...

Embodiment 3

[0035] The low-temperature brine (salt content: 6%) obtained from atrazine production at 20°C enters the coiled tube exchanger through a diaphragm pump, is heated to 65°C, and then enters an evaporator with a scraper for spray evaporation. Instant evaporation, salt crystallization on the wall of the evaporator is scraped off by a scraper, and the scraped salt is output through a -0.10Mpa air lock and a conveyor belt. The evaporated water vapor enters the compressor through the vacuum generated by the water ring vacuum pump, and the compressor compresses the lower-temperature water vapor into secondary steam at a temperature of 105°C, and the secondary steam enters the coiled tube exchanger to provide heating for low-temperature brine. The thermal energy, the water after the secondary steam condensation enters the collection tank for recycling or further treatment.

[0036] The purity of the salt output by the conveyor belt in this embodiment is 90.23%, the water content is 8.5...

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Abstract

The invention discloses a brine desalting method which comprises the steps of: brine is heated to 60 to 80 DEG C, and atomized and evaporated through an evaporator; the brine in the evaporator is evaporated to generate steam, and the steam is exhausted from the top of the evaporator; salt in the brine falls to the bottom of the evaporator in a form of crystallizing, and then is discharged from the bottom; after being exhausted from the top of the evaporator, the steam is compressed into secondary steam at a high temperature for providing heat to heat the brine; and water produced by condensing the secondary steam can be recycled. The invention also discloses a brine desalting system utilizing the method. The method is simple to operate, and has a high desalting rate, and the desalting system has high efficiency; with the brine desalting method, the steam is condensed, a potential heat energy is fully utilized, and energy consumption of the whole system is greatly reduced; the desalting method is an efficient and energy-saving environmental-friendly desalting method.

Description

technical field [0001] The invention relates to a brine desalination method and a used desalination system, in particular to a method and a desalination system for removing soluble inorganic salts in concentrated brine, belonging to the technical field of water treatment. Background technique [0002] In the production process of chemical industry, electric power, petroleum, metallurgy and other industries, a large amount of concentrated brine is discharged, mainly including reverse osmosis concentrated drainage, circulating cooling system sewage and boiler sewage. This type of wastewater contains a large amount of soluble inorganic salts, with a salt content of 1-20%, and a conductivity higher than 2000μs / cm. If it is discharged directly, it will pollute the water body. In addition, with the lack of water resources, seawater desalination technology is becoming more and more important. At present, the common processes for desalination from wastewater or seawater include mul...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/12
CPCY02A20/124
Inventor 孙国庆李志清侯永生邹宗加姚红霞张印旺
Owner SHANDONG WEIFANG RAINBOW CHEM
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