Carbon dioxide capture system

Abstract

To provide a carbon dioxide capture system capable of recovering high concentrations of carbon dioxide from the atmosphere. [Solution] The carbon dioxide recovery system 2 comprises a carbon dioxide adsorption tank 431 containing a carbon dioxide adsorbent, a suction means 45 for reducing the pressure inside the carbon dioxide adsorption tank 431 to a low vacuum pressure, and a heating unit 441 for heating the carbon dioxide adsorbent by electromagnetic wave heating. After a low-adsorption gas discharge step is performed in which the suction means 45 sucks up a low-adsorption gas containing components adsorbed on the carbon dioxide adsorbent with an adsorption force weaker than the adsorption force of the carbon dioxide adsorbent and discharges it from the carbon dioxide adsorption tank 431, the heating unit 441 heats the carbon dioxide adsorbent by electromagnetic wave heating, and a detachment step is performed in which the suction means 45 sucks up the concentrated gas containing carbon dioxide detached from the heated carbon dioxide adsorbent and guides it toward the storage unit 7 for storing carbon dioxide.

Claims

1. A carbon dioxide capture system that directly captures carbon dioxide from the atmosphere, A carbon dioxide adsorption tank containing a carbon dioxide adsorbent that adsorbs the carbon dioxide contained in the air in the atmosphere, A suction means for reducing the internal pressure of the carbon dioxide adsorption tank to a low vacuum pressure of 1 kPa or more and 90 kPa or less, and for drawing in the gas contained in the carbon dioxide adsorption tank, A heating unit that heats the carbon dioxide adsorbent by electromagnetic wave heating, Equipped with, A carbon dioxide recovery system characterized in that, after a low-adsorption gas discharge step is performed in which the suction means draws in a low-adsorption gas containing components adsorbed on the carbon dioxide adsorbent with an adsorption force weaker than the adsorption force of the carbon dioxide adsorbent, by reducing the internal pressure of the carbon dioxide adsorption tank to the low vacuum pressure, and the low-adsorption gas drawn in by the suction means is released from the carbon dioxide adsorption tank into the atmosphere, the heating unit heats the carbon dioxide adsorbent by electromagnetic wave heating, and the suction means continues from the low-adsorption gas discharge step to draw in a concentrated gas containing carbon dioxide that has detached from the heated carbon dioxide adsorbent by reducing the internal pressure of the carbon dioxide adsorption tank to the low vacuum pressure, and the concentrated gas drawn in by the suction means is guided toward a storage unit for storing carbon dioxide.

2. The carbon dioxide recovery system according to Claim 1, characterized in that the suction means reduces the pressure inside the carbon dioxide adsorption tank to a low vacuum pressure of 5 kPa or more and 85 kPa or less, and suctions the gas contained in the carbon dioxide adsorption tank.

3. The carbon dioxide recovery system according to claim 1, characterized in that the electromagnetic heating is microwave heating.

4. The carbon dioxide recovery system according to claim 1, characterized in that the electromagnetic heating is high-frequency dielectric heating.

5. The carbon dioxide recovery system according to claim 1, characterized in that the carbon dioxide adsorbent is a porous structure.

6. The carbon dioxide recovery system according to claim 1, characterized in that the carbon dioxide adsorbent is a zeolite.

7. The carbon dioxide recovery system according to claim 1, further characterized in that a purging step is performed in which the concentrated gas containing carbon dioxide is introduced into the carbon dioxide adsorption tank, the unadsorbed gas present in the internal space of the carbon dioxide adsorption tank that is not adsorbed by the carbon dioxide adsorbent contained in the carbon dioxide adsorption tank is pushed out of the carbon dioxide adsorption tank, and the low-adsorbed gas that was adsorbed by the carbon dioxide adsorbent contained in the carbon dioxide adsorption tank is replaced with the concentrated gas.

8. The system comprises multiple carbon dioxide adsorption tanks, The carbon dioxide recovery system according to claim 7, characterized in that the concentrated gas containing carbon dioxide is obtained by the detachment process in a carbon dioxide adsorption tank other than the carbon dioxide adsorption tank.

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