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Ammonia desulfurization system dechlorination method based on membrane treatment

A technology of ammonia desulfurization and membrane treatment, which is applied in precipitation treatment, ammonium sulfate, water/sewage treatment, etc. It can solve the problem of inability to control the content of chloride ions, slow down the speed of chloride ion enrichment, and the difficulty of treatment, etc. problem, to achieve the effect of guaranteeing production, good removal effect and improving safety

Inactive Publication Date: 2020-04-07
HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the washing liquid treated by this method needs to enter the sewage station for treatment, and it is difficult to treat it with high ammonia nitrogen content; the treated object can only remove the chlorine in the flue gas, and the chlorine in other places such as the solution cannot be removed, so ammonia Chloride ions will still be enriched in the desulfurization system by desulfurization method, but the speed of chloride ion enrichment will be greatly slowed down, and the chloride ion content of the system cannot be controlled

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] A method for removing chlorine in an ammonia desulfurization system based on membrane treatment, comprising the following steps:

[0027] 1) Introduce the desulfurized waste water (centrifugal mother liquid sulfate radical: 315000ppm, chloride ion 49500ppm) into the stock solution tank, then lift it to the pH adjustment tank to adjust the pH to acidic, wherein the adjusted pH is 4-6, and let it settle 20min, forming sediment and supernatant, wherein the sediment is returned to the desulfurization system;

[0028] 2) Transfer the supernatant in step 1) to the regulating tank, and add water to the regulating tank to dilute the supernatant, wherein the ratio of adding water to the supernatant is 2:1;

[0029] 3) filtering the suspended solids from the diluted supernatant in step 2) through a tubular ultrafiltration membrane with a filtration accuracy of 0.01 μm, and then transporting it to an ultrafiltration water production tank;

[0030] 4) Transport the liquid in the u...

Embodiment 2

[0035] A method for removing chlorine in an ammonia desulfurization system based on membrane treatment, comprising the following steps:

[0036] 1) Introduce the desulfurized waste water (centrifugal mother liquid sulfate radical: 315000ppm, chloride ion 49500ppm) into the stock solution tank, then lift it to the pH adjustment tank to adjust the pH to acidic, wherein the adjusted pH is 4-6, and let it settle 30min, forming a precipitate and a supernatant, wherein the precipitate is returned to the desulfurization system; 2) the supernatant in step 1) is transported to a regulating tank, and water is added to the regulating tank to dilute the supernatant, wherein water is added The ratio to the supernatant is 3:1;

[0037] 3) filtering the suspended solids from the diluted supernatant in step 2) through a tubular ultrafiltration membrane with a filtration accuracy of 0.03 μm, and then transporting it to an ultrafiltration water production tank;

[0038] 4) Transport the liquid...

Embodiment 3

[0043] A method for removing chlorine in an ammonia desulfurization system based on membrane treatment, comprising the following steps:

[0044] 1) Introduce the desulfurized waste water (centrifugal mother liquid sulfate radical: 315000ppm, chloride ion 49500ppm) into the stock solution tank, then lift it to the pH adjustment tank to adjust the pH to acidic, wherein the adjusted pH is 4-6, and let it settle 40min, forming precipitate and supernatant, wherein the precipitate is returned to the desulfurization system; 2) the supernatant in step 1) is transported to the adjustment tank, and water is added to the adjustment tank to dilute the supernatant, wherein water is added The ratio to the supernatant is 3:1;

[0045] 3) filtering the suspended solids from the diluted supernatant in step 2) through a tubular ultrafiltration membrane with a filtration accuracy of 0.05 μm, and then transporting it to an ultrafiltration water production tank;

[0046] 4) Transport the liquid i...

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Abstract

The invention discloses an ammonia desulfurization system dechlorination method based on membrane treatment, which comprises the following steps: (1) introducing desulfurized wastewater into a stock solution tank, then lifting the wastewater into a pH regulation tank to regulate the pH until the wastewater is acidic, standing and settling for 20-40 minutes to form a precipitate and a supernatant,and returning the precipitate to a desulfurization system; (2) conveying the supernatant in the step (1) to a regulation tank, and adding water into the regulation tank to dilute the supernatant; and(3) filtering the diluted supernatant in the step (2) through a tubular ultrafiltration membrane to obtain suspended matters, and then conveying the suspended matters into an ultrafiltration water production tank. Chlorine in the solution is converted into ammonium chloride crystals which are brought out of the system, the chlorine ion removal effect is good, the chlorine removal efficiency is high, corrosion to equipment is reduced, the safety of the equipment in the working process is improved, and smooth production of ammonium sulfate is guaranteed.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for removing chlorine in an ammonia desulfurization system based on membrane treatment. Background technique [0002] Many thermal power plants use the ammonia method to desulfurize the flue gas in the boiler, which is a wet flue gas desulfurization process that uses amino substances as absorbents to remove sulfur dioxide in the flue gas and recover by-products (ammonium sulfate). In the wet desulfurization system, the concentration of chloride ions in the absorption tower needs to be controlled below 20,000 mg / l, otherwise it will affect the service life of the equipment, desulfurization efficiency, and quality of by-products. [0003] The existing ammonia desulfurization system does not have a waste water discharge system and a device for removing chloride ions. And it is impossible to reduce the source of chloride ions fundamentally, beca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C01C1/24C01C1/16C02F101/12C02F103/18
CPCC02F9/00C01C1/24C01C1/164C02F1/66C02F2001/007C02F1/444C02F1/44C02F1/04C02F2101/12C02F2103/18
Inventor 程棋波魏超侯晓峰赵经纬丁国良
Owner HANGZHOU TIAN CHUANG ENVIRONMENTAL TECH
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