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Garbage fly ash water washing liquid evaporation desalination system and method

A garbage fly ash and water washing technology, applied in the field of evaporative desalination, can solve the problems of high salt concentration, low evaporation capacity, and poor salt output, and achieve the effect of high separation efficiency, large evaporation capacity, and smooth salt output

Inactive Publication Date: 2015-11-04
BEIJING BUILDING MATERIALS ACADEMY OF SCI RES +1
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Problems solved by technology

The Chinese invention patent with the patent number ZL201110031075.2 "A system and method for extracting potassium and sodium salts from garbage incineration fly ash" discloses a unit for extracting potassium and sodium salts from garbage fly ash washing liquid, which mainly includes preheating device, evaporator, flash crystallizer and steam mechanical compressor, etc. This unit is actually a very simple MVR (Mechanical Vapor Recompression) system. Since the salt contained in the waste fly ash washing liquid includes sodium chloride, potassium chloride, sodium carbonate, calcium chloride, etc., the composition is complex and the salt concentration is high, which makes the above units have low evaporation capacity and poor stability in actual operation. And problems such as poor salt discharge, so it is necessary to make innovative improvements to this unit

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  • Garbage fly ash water washing liquid evaporation desalination system and method

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example 1

[0039] A method for evaporating and desalting garbage fly ash water washing liquid, comprising the steps of:

[0040] 1) Turn on the feed pump, inject the pretreated garbage fly ash washing solution with a salt concentration of 8% into the preheater for heating, the heating medium is condensed water after heat exchange, and control the material temperature after heating to ≥95° ;

[0041] 2) After preheating, the material enters the falling film evaporator for evaporation and concentration, and the evaporation temperature in the falling film evaporator is controlled to be 103-104°C;

[0042] 3) After evaporation and concentration, the material with a salt concentration of 20-27% enters the falling film separator for gas-liquid separation. After separation, the steam enters the compressor system. After separation, part of the liquid returns to the falling film evaporator through the circulating pump to continue evaporation, and the other part It is pumped into the forced circu...

example 2

[0048] A method for evaporating and desalting garbage fly ash water washing liquid, comprising the steps of:

[0049] 1) Turn on the feed pump, inject the pretreated garbage fly ash washing solution with a salt concentration of 10% into the preheater for heating, the heating medium is condensed water after heat exchange, and control the material temperature after heating to ≥95° ;

[0050] 2) After preheating, the material enters the falling film evaporator for evaporation and concentration, and the evaporation temperature in the falling film evaporator is controlled at 105-106°C;

[0051] 3) After evaporation and concentration, the material with a salt concentration of 20-27% enters the falling film separator for gas-liquid separation. After separation, the steam enters the compressor system. After separation, part of the liquid returns to the falling film evaporator through the circulating pump to continue evaporation, and the other part It is pumped into the forced circula...

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Abstract

The invention discloses a garbage fly ash water washing liquid evaporation desalination system and method. The system comprises two individual evaporative concentration and evaporation crystallization units. A compressor provides desired heat energy for the units and keeps heat energy balance. The evaporative concentration unit comprises a preheater, a falling film evaporator and a falling film separator. Through garbage fly ash water washing liquid pre-heating and repeated evaporation, the material is concentrated. The evaporation crystallization unit comprises a forced circulation separator and a forced circulation evaporator. Through further evaporation of the concentrate, the material is in a saturated or oversaturated state and salt crystals are precipitated. Through settlement condensation adopting a thickener and separation adopting a centrifuge, the salt in the garbage fly ash water washing liquid can be separated finally. The system adapts to the garbage fly ash water washing liquid characteristics of complex components and high salt content, has the characteristics of large evaporation capability, operation stability and smooth desalination and guarantees large scale stable treatment on the garbage fly ash water washing liquid.

Description

technical field [0001] The invention relates to the technical field of evaporative desalination, and is especially suitable for evaporative desalination of salty water with complex components and high concentration. Specifically, it relates to an evaporative desalination system and method for garbage fly ash washing liquid. technical background [0002] Garbage fly ash refers to the residue collected from the flue gas purification system of waste incineration power plants. It contains organic pollutants such as dioxins and furans and soluble heavy metals such as Pb and Cr. Effective disposal. According to the composition characteristics of waste fly ash, sintering cement as raw material is an effective method to dispose of waste fly ash, but the content of chloride ion in waste fly ash is high, and directly used as cement raw material will cause skinning and blockage, which will affect the normal operation of cement kiln. Therefore, it is necessary to pretreat the fly ash o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
Inventor 朱延臣张国亮黄岚蔡文涛顾军练礼财
Owner BEIJING BUILDING MATERIALS ACADEMY OF SCI RES
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