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Emulsion film method for removing dust in gas fume

An emulsion liquid film and flue gas technology, which is applied in the field of flue gas dust removal and flue gas dust removal by using emulsion liquid film, can solve the problems of unsatisfactory dust removal effect and large water consumption, and achieve light specific gravity, reduce carryover, and strong adhesive effect

Inactive Publication Date: 2010-05-26
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Description
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Problems solved by technology

[0003] Flue gas dust removal methods are usually divided into dry dust removal and wet dust removal. Dry dust removal includes gravity dust removal, cyclone dust removal, filter dust removal, and electric dust removal. The dust removal effect is not ideal; wet dust removal includes multi-tube Venturi flue gas dust removal, spray tower dust removal, swirling flue gas dust removal, etc. The medium of wet dust removal is water. Or the form of mist is removed with the flue gas, therefore, a large amount of water will be consumed while removing dust

Method used

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  • Emulsion film method for removing dust in gas fume

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example 1

[0028] 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 water with the same volume as the oil as the internal phase liquid, and stir at a speed of 3500r / min. After the internal phase liquid is added, continue stirring for 10 minutes to obtain a water-in-oil emulsion;

[0029] 2. Flue gas dust removal: Mix the prepared emulsion with water 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 dust content of 200mg / m 3 , The flue gas with a flow rate of 2L / min is contacted for desulfurization, and the dust removal effect can be kept above 98% within 60 minutes;

[0030] 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-e...

example 2

[0033] 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 water with the same volume as the oil as the internal phase liquid, and stir at a speed of 3000r / min. After adding the internal phase liquid, continue stirring for 8 minutes to obtain a water-in-oil emulsion;

[0034] 2. Flue gas dust removal: mix the prepared emulsion with water at a volume ratio of 1:3, spray at a speed of 100ml / min with a total volume, and the dust content is 200mg / m 3 , The flue gas with a flow rate of 2L / min is in countercurrent contact for dust removal, and the dust removal effect can be kept above 97%;

[0035] 3. Repeated emulsification of demulsification and membrane phase liquid: Periodically separate the partly loaded emulsion into static layers, separate the oil layer and re-emulsion, and return the emulsion without demulsification to th...

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Abstract

The invention aims to provide a method for removing dust in gas fume by adopting an emulsion film technology. The method comprises the following steps that: (1) a surface active agent is dissolved in a film solvent, and water is added and used as internal phase liquid to prepare a water-in-oil type emulsion; (2) the prepared emulsion is dispersed into the water so as to ensure that the emulsion is in contact with gas fume by a spraying mode or a reaction pool (pot) mode; (3) dust adsorbed by a liquid film can automatically subside, and the dust is discharged from the bottom of a dust removal pool (pot) or a dust removal tower in the form of slurry; and (4) due to the gravity action of the dust, partial emulsion can automatically demulsify, and the film phase liquid floating on the surface of the water can be used for renewedly preparing an emulsion. The method has the advantages that the specific surface area of emulsion drops of the emulsus liquid film is large, and the adhesion of an oily film phase and the dust is strong, thus the dust removal effect is improved; the film phase liquid has higher boiling point and effectively reduces water quantity taken away by the gas fume; and the film phase liquid is not mixed and dissolved with water and can be repeatedly used.

Description

Technical field: [0001] The invention relates to a method for removing dust from flue gas, in particular to a method for removing dust from flue gas by using an emulsion liquid film, which belongs to the field of environmental chemical industry. Background technique: [0002] Smoke refers to solid particles that are produced during the production process and can be suspended in the gas for a long time. There are many types of smoke and dust, which are widely distributed. The main sources are domestic boilers, thermal power plants, smelting plants and sintering plants in the metallurgical industry, cement plants in the construction industry, pesticide plants, fertilizer plants, and rubber plants in the chemical industry. The dust in the flue gas enters the human body through the respiratory tract, causing respiratory diseases. The harmful components in it will cause the human body to suffer from various related diseases, seriously endangering people's health; the dust will al...

Claims

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Application Information

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IPC IPC(8): B01D47/00B01D61/40B01D67/00
Inventor 李红霞吕强三李国江闫宏赵湘
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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