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Method for removing dust out of smoke

A flue gas and dust technology, applied in the field of environmental science, can solve the problems of unsatisfactory dust removal effect and large consumption, and achieve the effect of improving dust removal effect, reducing evaporation and strong adhesion

Inactive Publication Date: 2014-09-03
NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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-pipe Venturi flue gas dust removal, spray tower dust removal, swirling flue gas dust removal, etc. The medium of wet dust removal is water, and because the flue gas has a high temperature, water will The form of steam or mist is removed with the flue gas, so a large amount of water will be consumed while removing dust,

Method used

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  • Method for removing dust out of smoke

Examples

Experimental program
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Effect test

example 1

[0029] 1. Prepare water-in-oil (W / O) type emulsion: use kerosene as membrane solvent, L113B as surfactant, mix according to the ratio (volume ratio) of 97:3, and make it fully dissolve to form membrane phase liquid; Gradually add water with the same volume as the membrane phase liquid as the internal phase liquid, and stir at a speed of 3000r / min. After adding the internal phase liquid, continue stirring for 10 minutes to obtain a water-in-oil emulsion.

[0030] 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 in contact with it for dust removal. The dust removal time is 60 minutes, and the dust removal effect is 98%.

[0031] 3. Demulsification and repeated emulsification of the membrane phase liquid: regularly remove part of the loaded emulsion, carry out high-voltage electrostatic demulsi...

example 2

[0034] 1. Prepare water-in-oil (W / O) type emulsion: use diesel oil as membrane solvent, Span80 as surfactant, mix according to the ratio (volume ratio) of 96:4, and make it fully dissolve to form membrane phase liquid; Gradually add saturated lime water as the internal phase liquid, the volume ratio of the membrane phase liquid and the internal phase liquid is 1:0.5, and stir at a speed of 7000r / min. After the internal phase liquid is added, continue stirring for 8 minutes to obtain the oil-in-package Water-based emulsion.

[0035] 2. Flue gas dust removal: mix the prepared emulsion with water at a volume ratio of 1:4, spray at a speed of 80ml / min, and the dust content is 180mg / m 3 , The flue gas with a flow rate of 2L / min is in countercurrent contact for dust removal, and the dust removal effect is 98.5%.

[0036] 3. Demulsification and repeated emulsification of the membrane phase liquid: the emulsion loaded after dust removal is subjected to high-voltage electrostatic demu...

example 3

[0039] 1. Prepare water-in-oil (W / O) type emulsion: use kerosene as membrane solvent, L113A as surfactant, mix according to the ratio (volume ratio) of 95:5, and make it fully dissolve to form membrane phase liquid; Gradually add saturated seawater as the internal phase liquid, the volume ratio of the membrane phase liquid and the internal phase liquid is 1:1.5, and stir at a speed of 4800r / min. After the internal phase liquid is added, continue stirring for 10 minutes to obtain water-in-oil type lotion.

[0040] 2. Flue gas dedusting: mix the prepared emulsion with seawater at a volume ratio of 1:3, the total volume is 1000ml, and the dust content in the desulfurization tank is 200mg / m 3 , Flue gas contact with a flow rate of 2L / min, and dust removal under low-speed stirring of 200r / min, the dust removal effect is 99.2%.

[0041] 3. Demulsification and repeated emulsification of the membrane phase liquid: the emulsion loaded after dust removal is subjected to high-voltage el...

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Abstract

The invention aims at providing a method for removing dust out of smoke by using an emulsion liquid film technique. The method comprises the following steps: (1) dissolving a surfactant in a film solvent, adding water as an inner phase liquid to prepare a water-in-oil emulsion; (2) dispersing the prepared emulsion in water, enabling the emulsion to come into contact with the smoke to remove dust by using a spraying or reaction pool (tank) method; (3) demulsifying the dust-loaded emulsion with high-voltage static electricity, wherein the film-phase liquid at the upper layer of a separator can be used for re-preparation of the emulsion after the emulsion is still; and (4) discharging the separated dust in a mud slurry form from the bottom of a dust removing pool (tank) or dust removing tower after the separated dust settles. The method has the advantages that the specific surface area of the emulsion drop of the emulsion film is large; the oily film-phase liquid has strong adhesion performance and good dust removing effect; the film-phase liquid has a relatively high boiling point, so that the water amount taken away by the smoke is effectively reduced; the film-phase liquid is not insoluble in water, so that the film-phase liquid can be used repeatedly.

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 science. 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, incinerators in the cremation industry, waste incinerators in the waste disposal industry, thermal power plants, smelters and sintering plants in the metallurgical industry, cement plants in the construction industry, and waste incinerators in the chemical industry. Pesticide factory and chemical fertilizer factory, rubber factory, etc. The dust in the flue gas enters the human body through the respiratory tract, causing respiratory diseases. The harmful components in it will ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B01D47/06
CPCB01D47/06B01D2247/10B01D61/40B01D2247/04B01D2247/14B01D17/06B01D21/245B01D47/02B01D53/228B01D67/0002
Inventor 李红霞张俊杰李国江吕强三闫宏赵湘
Owner NORTH CHINA UNIVERSITY OF SCIENCE AND TECHNOLOGY
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