Carbon dioxide capture system and carbon dioxide capture method

Patent metadata

Field	Value
Publication number	US-2024042380-A1
Application number	US-202318172820-A
Country	US
Kind code	A1
Filing date	Feb 22, 2023
Priority date	Aug 8, 2022
Publication date	Feb 8, 2024
Grant date	—

Abstract

A carbon dioxide capture system of an embodiment includes an intake unit, an electrolysis unit, a power supply unit, and a capture unit. The intake unit takes in gas by utilizing gaseous flow around the intake unit, and, in the electrolysis unit, an adsorbent can adsorb and release carbon dioxide by an adjustment of an electric potential of the electrolysis unit. The power supply unit adjusts the electric potential so as to adsorb carbon dioxide from the flowing gas to the adsorbent and release the carbon dioxide from the adsorbent in the electrolysis unit. The capture unit collects the carbon dioxide released from the adsorbent after adsorption to the adsorbent.

First claim

What is claimed is:

1 . A carbon dioxide capture system comprising:
an intake unit which takes in gas through an intake port by utilizing gaseous flow around the intake unit; and an electrolysis unit including an adsorbent which can adsorb and release carbon dioxide by an adjustment of an electric potential of the electrolysis unit, the gas flowing from the intake port into the electrolysis unit; a power supply unit which adjusts the electrical potential of the electrolysis unit, so as to adsorb carbon dioxide from the flowing gas to the adsorbent and release carbon dioxide from the adsorbent in the electrolysis unit; and a capture unit which collects carbon dioxide released from the adsorbent after adsorption to the adsorbent.

2 . The carbon dioxide capture system of claim 1 , further comprising:
a flow meter which measures a rate of gas flow at the intake port of the intake unit; a flow rate adjusting unit placed between the intake port and the electrolysis unit and adjusting the gaseous flow rate toward a downstream side; and a control unit which controls the flow rate of the adjusting unit, based on single or multiple measurement results of the flow meter, by regulating the gas flow rate toward the downstream side so as not to exceed a standard value.

3 . The carbon dioxide capture system of claim 1 , further comprising:
an anemoscope which measures a direction of ambient gas flow of the intake unit; and a control unit which controls a position of the intake unit and adjusts an opening direction of the intake port based on single or multiple measurement results of the anemoscope.

4 . The carbon dioxide capture system of claim 1 , wherein
the intake unit further includes a flow channel from the intake port to the electrolysis unit, and a cross-sectional area of the flow channel decreases gradually away from the intake port.

5 . The carbon dioxide capture system of claim 1 , wherein the intake port is arranged at an angle of depression with respect to a horizontal plane in the intake unit.

6 . The carbon dioxide capture system of claim 1 , further comprising:
a water level gauge which measures ambient water level of the intake unit; an opening/closing member which switches an operating state of the intake port between an open state and a close state; and a control unit which controls an operation of the opening/closing member, based on single or multiple measurement results of the water level gauge, so as to close the intake port by the opening/closing member in case of which the water level exceeds a referential level.

7 . The carbon dioxide capture system of claim 1 , further comprising a filter that is attached to the intake unit and is able to cover the intake port.

8 . The carbon dioxide capture system of claim 1 , wherein the gaseous flow can be flowed from the intake port of the intake unit into the electrolysis unit without heating or cooling.

9 . The carbon dioxide capture system of claim 8 , wherein the gas can be flowed into the electrolysis unit at temperature in a range of −10° C. to 50° C.

10 . The carbon dioxide capture system of claim 1 , further comprising:
a flow rate adjusting unit which is located between the intake port and the electrolysis unit and adjusts a gas flow rate flowing toward a downstream side; and a first thermometer measuring temperature of the gas taken in from the intake port between the intake port and the flow rate adjusting unit; and a second thermometer measuring the temperature of the gas flowing from the flow rate adjusting unit toward the downstream side between the flow rate adjusting unit and the electrolysis unit.

11 . The carbon dioxide capture system of claim 1 , wherein the adsorbent of the electrolysis unit includes one or several redox-active compounds.

12 . The carbon dioxide capture system of claim 11 , wherein the adsorbent of the electrolysis unit adsorbs the carbon dioxide in a reduction state and releases the carbon dioxide in an oxidation state, by an electrical response to the electric potential.

13 . The carbon dioxide capture system of claim 11 , wherein
the adsorbent of the electrolysis unit further includes at least one of metal-organic frameworks and covalent-organic frameworks, and the metal-organic frameworks and/or the covalent-organic frameworks include a molecule of the redox-active compound as a crosslinking moiety.

14 . The carbon dioxide capture system of claim 11 , wherein
the electrolysis unit includes an electrolytic solution, and the electrolytic solution includes the redox-active compound.

15 . The carbon dioxide capture system of claim 11 , wherein the redox-active compound includes at least one of the groups of a carbonyl compound, a pyridyl compound, and an imide compound.

16 . The carbon dioxide capture system of claim 1 , wherein
the electrolysis unit includes a working electrode, the working electrode includes a current collector and an adsorption layer formed on a surface of the current collector, and the adsorption layer includes the adsorbent.

17 . The carbon dioxide capture system of claim 1 , wherein
the electrolysis unit includes an electrolytic solution, and the electrolytic solution includes the adsorbent.

18 . The carbon dioxide capture system of claim 1 , wherein
the electrolysis unit includes a working electrode, the working electrode includes a current collector, and the current collector includes a porous body.

19 . A carbon dioxide capture method, comprising:
taking in gas from an intake port of an intake unit by utilizing gas flow in an environment in which the intake unit is located; flowing the gas taken in from the intake port of the intake unit into an electrolysis unit in which an adsorbent is capable of adsorbing and releasing carbon dioxide by an electric response to an electric potential; adjusting the electric potential to cause carbon dioxide contained in the gas flowing in from the intake port to be adsorbed to the adsorbent and cause the carbon dioxide adsorbed on the adsorbent to be released from the adsorbent in the electrolysis unit; and capturing the carbon dioxide released from the adsorbent after adsorption to the adsorbent.

Assignees

• Toshiba Kk

Inventors

• Saito Hitomi
• Miyamoto Hirohisa

Classifications

• C25B9/23

  comprising ion-exchange membranes in or on which electrode material is embedded · CPC title

• C25B9/70

  Assemblies comprising two or more cells · CPC title

• C25B15/08

  Supplying or removing reactants or electrolytes; Regeneration of electrolytes · CPC title

• C25B11/04

  characterised by the material · CPC title

• Y02C20/40

  of CO2 · CPC title