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Flue gas deep desulfurization and dust removal device and method by use of carbide slag-gypsum method

A technology of deep desulfurization and dust removal device, which is applied in separation methods, chemical instruments and methods, external electrostatic separators, etc., can solve the problems of low desulfurization efficiency and substandard flue gas emission, and achieves environmental protection and economic benefits. The effect of taking up space and avoiding clogging

Active Publication Date: 2015-07-01
AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem solved by the present invention is to provide a deep flue gas desulfurization and dust removal device and method using calcium carbide slag as a desulfurizing agent in view of the defects of low desulfurization efficiency and substandard flue gas emission in the existing calcium carbide slag-gypsum desulfurization method , effectively remove SO from flue gas 2 , SO 3 , PM2.5, etc., to achieve the purpose of deep purification from two aspects of flue gas desulfurization and dust removal

Method used

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  • Flue gas deep desulfurization and dust removal device and method by use of carbide slag-gypsum method

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Experimental program
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Effect test

Embodiment 1

[0062] The coal-fired flue gas from the boiler bag dust removal, the flue gas volume is 500-200m 3 / h, the sulfur dioxide concentration at the inlet of the primary desulfurization flue gas is 3000mg / Nm 3 , smoke concentration 192mg / m 3 , Flue gas temperature 135 ℃. After passing through the calcium carbide slag-gypsum flue gas deep desulfurization and dust removal device, the sulfur dioxide concentration at the outlet of the wet electric flue gas is 14mg / Nm 3 , the desulfurization efficiency reaches 99.5%, and the dust concentration is 8mg / Nm 3 , PM2.5 lower than 15ug / Nm 3 , flue gas temperature 46 ℃.

Embodiment 2

[0064] The coal-fired flue gas from the boiler bag dust removal, the flue gas volume is 270100m 3 / h, the sulfur dioxide concentration at the inlet of the primary desulfurization flue gas is 2670mg / Nm 3 , soot concentration 174mg / m 3 , Flue gas temperature 130 ℃. After passing through the calcium carbide slag-gypsum flue gas deep desulfurization and dust removal device, the sulfur dioxide concentration at the outlet of the wet electric flue gas is 12mg / Nm 3 , the desulfurization efficiency reaches 99.5%, the smoke is not detected, and the PM2.5 is lower than 15ug / Nm 3 , flue gas temperature 44 ℃.

Embodiment 3

[0066] The coal-fired flue gas from the boiler bag dust removal, the flue gas volume is 441253m 3 / h, the sulfur dioxide concentration at the inlet of the primary desulfurization flue gas is 3640mg / Nm 3 , soot concentration 192mg / m 3 , Flue gas temperature 140 ℃. After the calcium carbide slag-gypsum flue gas deep desulfurization and dust removal device, the sulfur dioxide concentration at the outlet of the wet electric flue gas is 15mg / Nm 3 , the desulfurization efficiency is up to 99.5%, and the dust is 7mg / Nm 3 , PM2.5 lower than 15ug / Nm 3 , flue gas temperature 52 ℃.

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Abstract

The invention discloses a flue gas deep desulfurization and dust removal device and method by use of a carbide slag-gypsum method. The flue gas deep desulfurization and dust removal device comprises a desulfurizing tower, a wet type electric precipitation demister, a sedimentation tank, a dehydration system and a grout preparation system, wherein the two-stage desulfurizing tower is connected with the wet type electric precipitation demister in series, and compared with a traditional double-tower double-circulation desulfurization process, the method has the desulphurization efficiency up to 99% and more, and the occupying space of the desulfurizing tower can be effectively reduced; carbide slag is used as a desulfurizing agent, a method of waste control by waste is utilized, the method is environmentally friendly and has the remarkable economic benefit; two-stage cyclone classification grouting is adopted, and grouts with different specifications can be prepared, while the absorption efficiency of the desulfurizing tower is ensured, a filling layer inside the desulfurizing tower can be prevented from blockage effectively; the wet type electric precipitation demister is combined to further improve the dedusting efficiency, and the device and the method can be used for achieving zero emission of dust such as PM2.5 particularly.

Description

Technical field [0001] The invention belongs to the field of flue gas desulfurization and dust removal, and specifically relates to a flue gas deep desulfurization and dust removal device and method using carbide slag as a desulfurization agent. Background technique [0002] The main active ingredient of carbide slag slurry is Ca(OH) 2 , carbide slag solution can be used in desulfurization absorption towers to absorb SO in flue gas 2 , the desulfurization efficiency of the carbide slag / lime-gypsum method is generally around 95%, which is slightly higher than the traditional limestone-gypsum method, so it is used more and more widely. But since Ca(OH) 2 Slightly soluble in water, there is a drawback: when the calcium carbide slag solution exceeds a certain concentration, it is easy to block equipment pipelines. [0003] For example, the Chinese invention patent with announcement number CN 101642674 B discloses a wet flue gas desulfurization process for calcium carbide slag...

Claims

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Application Information

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IPC IPC(8): B01D53/80B01D53/50B01D53/96B03C3/16
Inventor 杨有余曾毅夫叶明强周益辉
Owner AEROSPACE KAITIAN ENVIRONMENTAL TECH CO LTD
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