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Purification treatment method of wastewater discharged from boiler

A treatment method and wastewater purification technology, applied in water/sewage treatment, heating water/sewage treatment, neutralized water/sewage treatment, etc., can solve the problems of unusable, heat grade reduction, etc., and achieve low energy consumption and low cost , The process is simple and feasible

Inactive Publication Date: 2018-06-01
安徽德司节能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, the existing recycling technologies include continuous row expansion container flash evaporation and heat exchanger recovery, of which the recovery volume of continuous row expansion container is only 20% to 24%, and although the heat exchanger recovery exceeds 50%, the heat grade is reduced. Almost unusable with sufficient cooling

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] A method for purifying and treating boiler blowdown wastewater, including treatment of sodium salt wastewater, magnesium salt wastewater, carbonic acid precipitation mother liquor, oxalic acid precipitation mother liquor and other process wastewater;

[0018] The steps of the sodium-salt wastewater treatment method are as follows: transport the sodium-salt wastewater to a grease trap, and after standing for 2 hours to separate layers, recover the extractant to obtain crude sodium-salt wastewater; pass the crude sodium-salt wastewater through a demulsification device, Demulsification at 500r / min for 30 minutes to remove the emulsification and obtain deoiled sodium salt wastewater; add sodium hydroxide solution to the deoiled sodium salt wastewater to adjust the pH to 8-10, then add flocculant for chemical reaction; after the reaction The separated sodium-salt wastewater is treated by sand filtration to separate the filter residue and clarified sodium-salt wastewater; the ...

Embodiment 2

[0026] A method for purifying and treating boiler blowdown wastewater, including treatment of sodium salt wastewater, magnesium salt wastewater, carbonic acid precipitation mother liquor, oxalic acid precipitation mother liquor and other process wastewater;

[0027] The steps of the sodium-salt wastewater treatment method are as follows: transport the sodium-salt wastewater to a grease trap, and after standing for 3 hours to separate layers, recover the extractant to obtain crude sodium-salt wastewater; pass the crude sodium-salt wastewater through a demulsification device, Demulsification at 1000r / min for 50 minutes to remove the emulsification and obtain deoiled sodium salt wastewater; add sodium hydroxide solution to the deoiled sodium salt wastewater to adjust the pH to 8-10, then add flocculant for chemical reaction; after the reaction The separated sodium-salt wastewater is treated by sand filtration to separate the filter residue and clarified sodium-salt wastewater; the...

Embodiment 3

[0035] A method for purifying and treating boiler blowdown wastewater, including treatment of sodium salt wastewater, magnesium salt wastewater, carbonic acid precipitation mother liquor, oxalic acid precipitation mother liquor and other process wastewater;

[0036]The steps of the sodium-salt wastewater treatment method are as follows: transport the sodium-salt wastewater to a grease trap, and after standing for 2.5 hours to separate layers, recover the extractant to obtain crude sodium-salt wastewater; pass the crude sodium-salt wastewater through a demulsification device, Break the emulsion for 40 minutes at a rotational speed of 750r / min, remove the emulsification, and obtain deoiled sodium salt wastewater; add sodium hydroxide solution to the deoiled sodium salt wastewater, adjust the pH to 8-10, and then add flocculant for chemical reaction; reaction After the separated sodium salt wastewater is treated by sand filtration, the filter residue and clarified sodium salt wast...

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Abstract

The invention discloses a purification treatment method of wastewater discharged from a boiler. The method comprises treatment of sodium salt wastewater, treatment of magnesium salt wastewater, treatment of carbonic acid precipitated mother liquor, treatment of oxalic acid precipitated mother liquor and treatment of wastewater produced with other processes, wherein the wastewater produced with other processes comprises dolomite pretreatment wastewater, oxalic acid precipitation washing water, carbonic acid precipitation washing water, wastewater produced during preparation in a purified waterstation, boiler wastewater and flue gas purification system wastewater. The method adopts a simple and feasible process and is low in cost, good in treatment effect, high in treatment efficiency, lowin energy consumption and the like, so that quality-based collection, treatment and recycling of wastewater produced by the boiler are realized, and zero-pollution emission and resource recycling of rare earth extraction raffinate sodium salt, magnesium salt, oxalic acid precipitated mother liquor, carbonic acid precipitated mother liquor and wastewater produced with other processes are really realized.

Description

technical field [0001] The invention belongs to the technical field of industrial wastewater, in particular to a method for purifying and treating boiler blowdown wastewater. Background technique [0002] For a long time, the recovery and utilization of low-grade waste heat has always been a subject that plagues the energy-saving industry. The low recovery rate and uselessness are the current common status of the industry. [0003] Boiler blowdown is one of the losses in boiler operation. In order to control the quality of boiler water and steam, the boiler must carry out continuous blowdown and regular blowdown. Part of the furnace water is discharged from the furnace water to reduce the salt content, alkali content, silicic acid content, suspended dross content and calcium and magnesium ion deposits in the furnace water. Its purpose is to ensure the quality of boiler water so that the boiler can operate stably and safely for a long time, and the heat loss is also one of t...

Claims

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Application Information

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IPC IPC(8): C02F9/10
CPCC02F9/00C02F1/001C02F1/04C02F1/281C02F1/38C02F1/40C02F1/52C02F1/56C02F1/66
Inventor 陈洪
Owner 安徽德司节能科技有限公司
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