A device and method for absorbing and concentrating waste gas containing carbon dioxide

A carbon dioxide and exhaust gas technology, applied in chemical instruments and methods, through absorption, separation methods, etc., can solve the problems of secondary pollution of absorbents, large amounts of heat energy, and increased cost of flue exhaust gas treatment, so as to achieve cost saving and easy operation Effect

Active Publication Date: 2015-08-19
ZHEJIANG UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the capture methods of carbon dioxide in flue gas are mainly chemical absorption method, pressure swing adsorption method and membrane separation method. These capture methods have disadvantages such as difficult regeneration of absorbent, easy secondary pollution of absorbent, and high cost of absorbent.
And the heat treatment after carbon dioxide capture to release carbon dioxide requires a lot of heat energy, which will increase the cost of flue gas treatment

Method used

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  • A device and method for absorbing and concentrating waste gas containing carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] use as figure 1 The device for absorbing and recovering waste gas containing carbon dioxide is shown to treat the carbon dioxide gas produced in the coal-to-natural gas process. The concentration of carbon dioxide in the waste gas is about 18g / m 3 , gas flow 35m 3 / h, the removal rate of carbon dioxide in the exhaust gas is about 96.2%. After the alkaline absorption liquid absorbs carbon dioxide, the pH drops below 10.0. From about 10.0 to above 12.8, the anolyte pH is below 1.72.

Embodiment 2

[0019] use as figure 1 The device for absorbing and recovering waste gas containing carbon dioxide is shown to treat carbon dioxide gas produced during coke oven combustion. The operation steps and principles are the same as in Example 1, and the concentration of carbon dioxide in the waste gas is about 24g / m 3 , gas flow 20m 3 / h, the removal rate of carbon dioxide in the waste gas is about 95.0%, and the pH of the alkaline absorption liquid drops below 10.0 after absorbing carbon dioxide. From about 10.0 to above 13.1, the anolyte pH is below 1.80.

Embodiment 3

[0021] use as figure 1 The device for absorbing and recovering waste gas containing carbon dioxide is shown to treat carbon dioxide gas produced during coke oven combustion. The operation steps and principles are the same as in Example 1, and the concentration of carbon dioxide in the waste gas is about 45g / m 3 , gas flow 25m 3 / h, the removal rate of carbon dioxide in the exhaust gas is about 95.3%, the pH of the alkaline absorption liquid after absorbing carbon dioxide is 9.80~10.10, after entering the EDI carbon dioxide recovery unit, after the regeneration of the absorbent and the extraction of carbonic acid, the absorption liquid is changed from the original about The weak alkaline becomes above 13.2, and the pH of the anolyte is lower than 1.68.

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Abstract

The invention discloses a device for absorbing and concentrating carbon dioxide containing exhaust gas. The device mainly consists of a carbon dioxide exhaust gas absorbing device and an EDI (Electronic Data Interchange) carbonic acid recovery device, wherein the EDI carbonic acid recovery device mainly consists of an anode chamber, a concentration chamber and a cathode chamber. The chambers are separated by ion exchange membranes. Carbon dioxide in exhaust gas is first reacted with an alkaline absorption liquid electrically generated in the carbon dioxide exhaust gas absorbing device to be converted into carbonate, and the absorbent is regenerated and pure carbonic acid is harvest in the EDI carbonic acid recovery device finally. The pure carbonic acid harvested can be directly used or used for extracting pure carbon dioxide. The device has the advantages of electric regeneration and circulation of the absorption liquid, capture of carbon dioxide, regeneration of the absorbent and extraction of carbon dioxide, easy operation, cost saving and the like. Carbon dioxide generated can be used as raw materials for producing chemical fertilizers and the like and manufacturing organic fuel such as methanol and the like.

Description

technical field [0001] The invention relates to a device and method for absorbing and concentrating waste gas containing carbon dioxide. Background technique [0002] Sequestration of carbon dioxide has been proposed as a key part of technological investment in managing anthropogenic climate change, as this approach offers a faster and less expensive route than abatement of carbon dioxide production. The capture and storage of carbon dioxide in flue gas includes capture of carbon dioxide in flue gas, liquefaction and transportation of captured carbon dioxide, injection of carbon dioxide solution into the ground or ocean for storage. At present, the capture methods of carbon dioxide in flue gas are mainly chemical absorption method, pressure swing adsorption method and membrane separation method. These capture methods have disadvantages such as difficult regeneration of absorbent, easy secondary pollution of absorbent, and high cost of absorbent. Moreover, the heat treatmen...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C25B1/00C25B9/00B01D53/18B01D53/14
CPCY02C10/06Y02C20/40Y02P20/151
Inventor 吴祖成张群芳任琼
Owner ZHEJIANG UNIV
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