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Method for removing CO2 from blast furnace clean coal gas by using ionic liquid

A technology of ionic liquid and clean gas, which is applied in the direction of liquid washing gas purification, etc., to achieve the effects of strong solubility, easy desorption and regeneration, and avoiding secondary pollution

Inactive Publication Date: 2012-08-01
UNIV OF SCI & TECH LIAONING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The ionic liquids provided by these disclosures are used to capture and absorb CO 2 or acid gases, but most of these ionic liquids reported are for CO 2 The study of absorption characteristics, while aiming at the use of ionic liquids to capture CO in blast furnace clean gas 2 The method and device have not been reported

Method used

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  • Method for removing CO2 from blast furnace clean coal gas by using ionic liquid
  • Method for removing CO2 from blast furnace clean coal gas by using ionic liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Removal of CO from blast furnace gas by using ionic liquid 2 method, such as figure 1 As shown, the blast furnace net gas flow path is as follows:

[0026] Clean blast furnace gas with a temperature between 20°C and 90°C after dedusting, CO 2 The gas content is 393g / m 3 , enter the tower from the air inlet 9 below the primary absorption tower 2, there is a gas distribution device in the tower, the pressure inside the tower is 0.01MPa ~ 0.03MPa, the blast furnace clean gas passes through the packing layer, and enters from the gas outlet 14 above the primary absorption tower 2 will be absorbed by CO 2 The final blast furnace clean gas is sent into the tower from the gas inlet 13 below the secondary absorption tower 3, and is absorbed again in the tower. There is a gas distribution device in the secondary absorption tower 3, and the blast furnace clean gas passes through the packing layer to remove CO 2 The final blast furnace clean gas is discharged from the gas outle...

Embodiment 2

[0030] The ionic liquid absorbent adopts imidazole amino acid ionic liquid N-methyl-N-n-butane imidazolium glycinate, the ratio of the amount of ionic liquid to the clean blast furnace gas substance is 18-2.6:1, and the primary absorption tower and the secondary absorption tower They all choose packed towers with Pall rings inside as fillers. The upper part of the two absorption towers is a liquid inlet pipe with a liquid distribution device, and the lower part is an air inlet with a gas distribution device. The desorption tower is a combined spray and plate tower. The other content of this embodiment is the same as that of Embodiment 1, and the CO of this embodiment 2 The removal rate is above 84.7%.

Embodiment 3

[0032]The ionic liquid absorbent uses ammonium salt amino acid ionic liquid tetramethylammonium lysine salt, the ratio of the amount of ionic liquid to the clean gas of the blast furnace is 20-3:1, and the primary absorption tower and the secondary absorption tower are both packed towers , with Pall rings inside as fillers. The upper part of the two absorption towers is a liquid inlet pipe with a liquid distribution device, and the lower part is an air inlet with a gas distribution device. The desorption tower is a spray tower. The other content of this embodiment is the same as that of Embodiment 1, and the CO of this embodiment 2 The removal rate is above 80.5%.

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Abstract

The invention discloses a method for removing CO2 from blast furnace clean coal gas by using an ionic liquid, which can be used for effectively lowering the exhaust pressure of CO2 and increasing the heat value of high blast coal gas. The method comprises the following steps of: fully contacting an ionic liquid with blast furnace clean coal gas to absorb CO2 in blast furnace clean coal gas; after absorbing CO2, re-contacting unsaturated ionic liquid with blast furnace clean coal gas to absorb CO2 in blast furnace clean coal gas once again; performing desorption on a saturated ionic liquid at a certain temperature to release the absorbed CO2 gas; and re-contacting the ionic liquid which is subjected to desorption with blast furnace clean coal gas to absorb CO2 in blast furnace clean coal gas once again. The ionic liquid adopted in the method has a good CO2 absorbing effect; after absorption, the ionic liquid is easy for desorption, regeneration, recovery and repeated use; the absorbed CO2 is released easily, and can be applied in other ways; and solid waste is not produced in an absorption process, atmospheric pollution caused by the volatilization of organic matters is not caused, and optimal allocation of carbon resources can be realized.

Description

technical field [0001] The invention relates to the field of metallurgy and environmental protection, in particular to a method for removing CO in blast furnace clean gas by using ionic liquid 2 Methods. Background technique [0002] Global warming has become an international issue, carbon dioxide (CO 2 ) is considered to be the most important cause of global warming. Blast furnace gas produced by blast furnace smelting contains more CO 2 , to remove CO from blast furnace gas 2 Both help to reduce CO 2 The discharge pressure can also increase the calorific value of the blast furnace gas. [0003] Currently, post combustion capture (PCC) CO 2 The method is mainly to absorb CO with an aqueous solution of ammonia and organic alcohol amine compounds. 2 , Such methods have problems such as corrosion to equipment and easy volatilization in the circulation process. And the CO of blast furnace gas 2 Capture is the treatment of process gas, and the treated blast furnace gas ...

Claims

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Application Information

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IPC IPC(8): C10K1/08
Inventor 张崇民陈书文孙志敏
Owner UNIV OF SCI & TECH LIAONING
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