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Emulsion film method for removing sulphur in flue gas

A technology of emulsion liquid film and flue gas, which is applied in the field of flue gas desulfurization. The use of emulsion liquid film in the field of flue gas desulfurization can solve the problems of large desulfurization agent consumption, secondary pollution, corrosion and scaling, and achieve light specific gravity and low Dosage, the effect of improving desulfurization efficiency

Inactive Publication Date: 2010-06-02
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both the semi-dry method and the wet method have problems such as large consumption of desulfurizer, easy to cause secondary pollution, easy to cause corrosion and scaling, etc.

Method used

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  • Emulsion film method for removing sulphur in flue gas

Examples

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Comparison scheme
Effect test

example 1

[0026] 1. Production of water-in-oil (W / O) type emulsion: kerosene is used as the film solvent, blue-113B is used as the surfactant, mixed according to the ratio (volume ratio) of 97:3, and fully dissolved to form the oil phase ; Gradually add the same volume of Ca(OH) at pH 10 as the oil 2 internal phase liquid, and stirred at a speed of 3500r / min, after adding the internal phase liquid, continue to stir for 10min to obtain a water-in-oil emulsion;

[0027] 2. Flue gas desulfurization: Mix the prepared emulsion with the lime solution with pH=8 at a volume ratio of 1:6, with a total volume of 1000ml, and mix it with a sulfur content of 1000mg / m under stirring at a low speed of 250-300r / min. 3 , Flue gas with a flow rate of 2L / min is contacted for desulfurization, and the desulfurization effect can be maintained at 99% within 60 minutes;

[0028] 3. Demulsification and repeated emulsification of membrane phase liquid: regularly remove part of the loaded emulsion, after the emu...

example 2

[0031] 1. Prepare water-in-oil (W / O) type emulsion: use kerosene as film solvent, Span80 as surfactant, mix according to the ratio (volume ratio) of 96:4, and make it fully dissolve to form oil phase; gradually Add the same volume of Mg(OH) at pH 10 as the oil 2 internal phase liquid, and stirred at a speed of 3000r / min, after the internal phase liquid was added, continued to stir for 8min to obtain a water-in-oil emulsion;

[0032] 2. Flue gas desulfurization: Mix the prepared emulsion with MgO slurry with pH=8 at a volume ratio of 1:5, with a total volume of 1000ml, and stir at a low speed of 250-300r / min with a sulfur content of 1000mg / m 3 , Flue gas with a flow rate of 2L / min is contacted for desulfurization, and the desulfurization effect can be maintained at 99% within 60 minutes;

[0033] 3. Demulsification and repeated emulsification of membrane phase liquid: regularly remove part of the loaded emulsion, after the emulsion is still, separate the oil layer and re-emuls...

example 3

[0036] 1. Water-in-oil (W / O) type emulsion: kerosene is used as the film solvent, blue-113A is used as the surfactant, mixed according to the ratio (volume ratio) of 97:3, and fully dissolved to form the oil phase ; Gradually add NaOH internal phase liquid with the same volume as the oil, and stir at a speed of 3500r / min. After adding the internal phase liquid, continue stirring for 10 minutes to obtain a water-in-oil emulsion.

[0037] 2. Flue gas desulfurization: Mix the prepared emulsion with seawater at a volume ratio of 1:3, spray at a speed of 100ml / min, and have a sulfur content of 1000mg / m 3 , The flue gas with a flow rate of 2L / min is contacted for desulfurization, and the desulfurization rate is 98%.

[0038] 3. Demulsification and repeated emulsification of the membrane phase liquid: the solution at the bottom of the spray tower is poured into the separation tank, and after standing still, the water layer is discharged, and the oil layer is separated and re-emulsifi...

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Abstract

The invention aims at providing a method for removing sulphur in flue gas by adopting emulsion film technology. The method includes the following steps: (1) surfactant is dissolved in film solvent, and alkaline internal phase liquid is added, so as to obtain water-in-oil type emulsion; (2) the emulsion is dispersed into alkaline desulphurization medium and then is contacted with flue gas for desulphurization in spraying or reaction tank (jug) manner; (3) settled desulphurized product is removed at the bottom of desulphurization tank (jug) or desulphurization tower; (4) part of demulsified emulsion is subject to standing, and film phase liquid floating on the surface is collected and used for preparing emulsion again. The invention has the following advantages: special area of emulsion drop is large, and emulsion drop can be fully contacted with flue gas by reciprocating collision, thus improving desulphurization efficiency; film phase liquid has higher boiling point, thus effectively reducing water amount taken away by flue gas; and film phase liquid and water are not blended or dissolved mutually, film phase liquid floats on the water phase and can be used for preparing emulsion again through collection.

Description

Technical field: [0001] The invention relates to a flue gas desulfurization method, in particular to a flue gas desulfurization method using an emulsion liquid film, which belongs to the field of environmental chemical industry. Background technique: [0002] Sulfur dioxide in flue gas is one of the most widely distributed, largest and most harmful gas pollutants. Its main sources include the combustion of sulfur-containing fuels, smelting of sulfur-containing minerals, waste gas from the chemical industry, and waste gas from cement kilns and other industries. . With the strengthening of environmental protection, flue gas desulfurization technology has attracted more and more attention. Flue gas desulfurization can be divided into three categories according to the process characteristics: dry method, semi-dry method and wet method. Dry desulfurization such as: charged dry jet desulfurization method, pulsed corona plasma method, etc. Dry desulfurization process is simple, n...

Claims

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Application Information

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IPC IPC(8): B01D61/40B01D53/50
Inventor 李红霞张俊杰吕强三张济祥赵湘闫宏
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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