High-concentration brine evaporative crystallization device and method

A technology for evaporative crystallization and concentrated brine, applied in the field of water treatment, can solve the problems of not involving heavy organic matter, accelerating clogging, affecting crystallization, etc., to reduce the probability, ensure normal progress, and facilitate desorption.

Pending Publication Date: 2021-03-26
SHANGHAI LANKE PETROCHEM ENG & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] "An Ammonium Sulfate Concentrated Two-Effect Evaporation System" (Patent No. CN203108242U), aimed at dilute ammonium sulfate wastewater containing heavy organic matter produced in an acrylonitrile plant, proposed a two-effect evaporation energy-saving device scheme, but did not involve how to eliminate heavy Effect of organic matter on evaporation and concentration
[0008] In view of the ubiquitous problem of accelerated clogging and affecting crystallization by organic impurities on the evaporative crystallization of concentrated brine, it is urgent to design a device and method that can remove organics during evaporative crystallization, reduce the risk of clogging, and ensure normal crystallization

Method used

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  • High-concentration brine evaporative crystallization device and method
  • High-concentration brine evaporative crystallization device and method
  • High-concentration brine evaporative crystallization device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0104] Concentrated brine raw material: The raw material is the same as Comparative Example 1.

[0105] Evaporation and crystallization process-the high-concentration brine evaporation and crystallization device (+secondary vapor compression) of the present invention: adopts MVR evaporation and crystallization technology. A vapor compressor is provided at the vaporization steam outlet of the high-concentration brine evaporation crystallization device of the present invention to adapt to MVR evaporation crystallization. After the concentrated brine feed water is mixed with the circulating mother liquor, it is sent to the evaporator by the circulating pump to be heated and evaporated. The generated secondary steam enters the steam compressor after passing through the mist eliminator to remove small impurities. The compressed steam enters the shell side of the evaporator for cyclic heating and utilization, and after heat exchange, the steam is converted into condensate for recov...

Embodiment 2

[0110] Concentrated brine raw material: The raw material is the same as Comparative Example 1.

[0111] Evaporation and crystallization process—the high-concentration brine evaporation and crystallization device of the present invention is the same process as that of implementation 1.

[0112] Process operating conditions

[0113] project data cycle ratio 85 Evaporation chamber pressure, MPa(G) -0.07～-0.08 Evaporation chamber temperature, ℃ 64～65 Heat exchanger tube flow rate 3.0

[0114] Operation effect: the evaporator has no fouling phenomenon, the heat transfer efficiency is high, and the device operates continuously; since the organic matter in the concentrated brine is separated out of the system in the evaporator, the phase separator cannot produce foam, and because the steam is pretreated by the cyclone After entering the demister to remove foam, the intolerant inorganic salt can be ignored for the demister, the entrainment of s...

Embodiment 3

[0116] Concentrated brine raw material: The raw material is the same as that of Comparative Example 2.

[0117] Evaporation and crystallization process—the high-concentration brine evaporation and crystallization device of the present invention is the same process as that of implementation 1.

[0118] Process operating conditions

[0119] project data cycle ratio 70 Evaporation chamber pressure, MPa(G) -0.07～-0.08 Evaporation chamber temperature, ℃ ～65 Heat exchanger tube flow rate 3.9

[0120] Operation effect: the evaporator has no fouling phenomenon, the heat transfer efficiency is high, and the device operates continuously; since the organic matter in the concentrated brine is separated out of the system in the evaporator, the phase separator cannot produce foam, and because the steam is pretreated by the cyclone After entering the demister to remove foam, the intolerant inorganic salt can be ignored for the demister, the entrainmen...

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Abstract

The invention relates to the technical field of water treatment, and discloses a high-concentration brine evaporative crystallization device and method. The device comprises an evaporator, a phase separator, a crystal separator and a circulating pump; the evaporator comprises an evaporator shell, an upper tube plate, a lower tube plate and a plurality of hollow heat exchange tubes; the upper tubeplate, the lower tube plate and the hollow heat exchange tubes are arranged in the evaporator shell, and the evaporator shell is divided into a first cavity, a second cavity and a third cavity throughthe upper tube plate and the lower tube plate; the plurality of heat exchange tubes are arranged in the first cavity at intervals, a steam channel is formed by the plurality of heat exchange tubes and the evaporator shell, and the plurality of heat exchange tubes penetrate through the upper tube plate and extend into the second cavity by a preset height; the phase separator is communicated with the second chamber; the crystal separator is communicated with the phase separator; and an inlet of the circulating pump is respectively communicated with a strong brine inlet and a liquid outlet of the crystal separator. According to the high-concentration brine evaporative crystallization device and method, organic matter can be removed in evaporative crystallization, the blockage risk is reduced, and normal crystallization is guaranteed.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a high-concentration brine evaporation crystallization device and method. Background technique [0002] The evaporation and crystallization of concentrated brine is the key unit and even the difficulty at the end of sewage treatment, waste gas purification, and various technological processes. The types of inorganic salts and impurities in the concentrated brine produced by different processes are different. In the field of zero discharge of sewage treatment wastewater, the main inorganic salt components of concentrated brine are sodium salt, a small amount of potassium salt, and intolerant salt impurities calcium and magnesium ions etc., the anions are mainly chloride ions and sulfate radicals, and also contain a small amount of chemicals (organic substances, characterized by COD) used in pretreatment and desalination processes, such as scale inhibitors, acids and other ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/38C02F1/52C02F9/00C02F2001/5218
Inventor 马洪玺吕英杰葛军林张文军
Owner SHANGHAI LANKE PETROCHEM ENG & TECH
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