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Device and method for electrically acquiring and purifying carbon dioxide

A carbon dioxide and extraction device technology, applied in chemical instruments and methods, separation methods, electrolysis processes, etc., can solve the problems of complex operation, high energy consumption and high price

Active Publication Date: 2013-07-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used carbon dioxide absorbents include amine absorbents such as diethanolamine, diethylene glycol, and methyldiethanolamine, polyethylene glycol absorbents, piperazine absorbents, etc., but these absorbents generally have high prices and low regeneration energy consumption. Large, with secondary pollution, not an energy-saving and environmentally friendly absorbent
The absorbed carbon dioxide needs to be released. The general thermodynamic release method is complicated to operate, difficult to control, and high in energy consumption. It cannot be an energy-saving and efficient release method.

Method used

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  • Device and method for electrically acquiring and purifying carbon dioxide
  • Device and method for electrically acquiring and purifying carbon dioxide
  • Device and method for electrically acquiring and purifying carbon dioxide

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Such as Figure 1 The carbon dioxide collection and extraction device shown in the figure recovers the carbon dioxide in the exhaust gas of the chimney of the power plant. The concentration of carbon dioxide in the exhaust gas is about 104.1g / m 3 , gas flow rate 100.0m 3 / h, after the gas collection and treatment by the carbon dioxide collection and extraction device, the removal rate of carbon dioxide in the flue gas is 97.4~98.1%, after extraction by the four-compartment EDI device, the conversion rate of acid radicals in the absorbent is 93.1~93.6%, the absorbent Restore alkaline, pH > 13.2. The concentration of carbon dioxide in the extracted carbon dioxide moisture is 67.2~68.3%. The obtained moisture is passed into the gas-liquid separation tower. In the tower, the water vapor and carbon dioxide are subjected to gravity, baffle and cyclone. Due to the large proportion of water vapor, they are blocked Gradually falling to the bottom of the tower, the carbon di...

Embodiment 2

[0027] Such as Figure 1 The carbon dioxide collection and extraction device shown is used to recover carbon dioxide in the coal-fired waste gas of a small boiler plant. The concentration of carbon dioxide in the exhaust gas is about 39.3g / m 3 , gas flow 40m 3 / h, after the carbon dioxide in the waste gas passes through the carbon dioxide absorption tower, the remaining waste gas is discharged, and the carbon dioxide removal rate is about 97.8%. After being extracted by the four-compartment EDI device, the carbonate ions and bicarbonate ions in the absorption liquid enter the concentrated The mobility is 93.2%, and the pH of the absorption liquid entering the EDI device has changed from about 10.0 to above 12.8. The carbon dioxide concentration in the dried out gas is about 99.4%. And the volume of the anion resin filled chamber is 0.45dm 3 , the thickness of the resin layer is 1.8cm, and the effective area of ​​the film is 2.5dm 2 , the voltage is 75V condition.

Embodiment 3

[0029] Such as Figure 1 The shown carbon dioxide collection and extraction device recovers the carbon dioxide in the waste gas discharged from the ammonia synthesis process. The total amount of carbonates treated was 9M, the influent flow rate was maintained at 4L / h, the conversion rate of carbonates was 92.8~93.3%, the purity of the gas after drying was as high as 99.1~99.2%, and the pH of the cathode effluent changed significantly, maintaining Above 12.4. The volume of the anion resin filled chamber is 0.24dm 3 , the thickness of the resin layer is 1.5cm, and the effective area of ​​the film is 1.6dm 2 , the voltage is 75V condition.

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Abstract

The invention discloses a device and method for electrically acquiring and purifying carbon dioxide. The device comprises the following main parts: a carbon dioxide absorbing tower, an electric concentration and extraction device and a gas-liquid separation tower. Carbon dioxide contained in a waste gas is absorbed by electrically-generated alkali liquor in the carbon dioxide absorbing tower to become a carbonate solution, after the carbonate solution enters the electric concentration and extraction device, carbonates are transferred to enter a concentration chamber and converged with electrically-generated hydrogen ions to gradually form carbonic acid, the carbonic acid continuously overflows after being saturated, and after the carbonic acid is separated and purified through the gas-liquid separation tower, the carbon dioxide is compressed and stored. The device disclosed by the invention has the advantages of no pollution, easiness for operation and recycling of electrically-generated alkali liquor, and the like and can be widely applied to industrial departments, namely coal-fired power generation, coke oven combustion of a coke making enterprise, lime kiln forging, and the like which generate carbon dioxide waste gases; and the obtained carbon dioxide gas is pure and can be used as an industrial raw material, such as organic fuel methanol, a fire extinguishing agent, a refrigerant, an artificial rainfall agent, and the like.

Description

technical field [0001] The invention relates to a device and method for electrically collecting and purifying carbon dioxide. Background technique [0002] Due to the massive emissions of carbon dioxide exhaust from thermal power plants, petroleum, petrochemical refining, and coal-based power plants, it leads to an increasingly serious greenhouse effect, causing damage to the climate, the ocean, and the human body. According to statistics from scientists, by the end of this century, it will need to be removed from the atmosphere megatons of CO 2 to maintain safe levels of carbon dioxide in the atmosphere. The current carbon dioxide treatment method is CCS (Carbon dioxide capture and storage, the collection and storage of carbon dioxide), which is divided into three steps: absorption, release and storage of carbon dioxide. Commonly used carbon dioxide absorbents include amine absorbents such as diethanolamine, diethylene glycol, and methyldiethanolamine, polyethylene glycol...

Claims

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Application Information

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IPC IPC(8): B01D53/78B01D53/96B01D53/62C25B1/00
CPCY02C20/40Y02P20/151
Inventor 吴祖成任琼廖文
Owner ZHEJIANG UNIV
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