METHOD FOR DISSOLVING CARBON DIOXIDE FROM FLUE OR OTHER GAS AND FOR NEUTRALIZING THE SOLUTION OBTAINED

• US 20110083555A1
• Filed: 06/30/2009
• Published: 04/14/2011
• Est. Priority Date: 06/30/2008
• Status: Active Grant

• Current Assignee: Cuycha Innovation Oy
• Original Assignee: Cuycha Innovation Oy
• Inventors: Nurmia, Matti
• Granted Patent: US 8,795,413 B2
• Time in Patent Office: Days
• US Class Current: 95/94
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 53/1425 Regeneration of liquid absorbents
• CPC Class Codes: B01D 53/1475 Removing carbon dioxide
• CPC Class Codes: B01D 53/78 with gas-liquid contact
• CPC Class Codes: C01F 11/18 Carbonates
• CPC Class Codes: C01F 5/24 Magnesium carbonates
• CPC Class Codes: C01F 7/02 Aluminium oxide; Aluminium hydroxide; Aluminates
• CPC Class Codes: F23J 15/04 using washing fluids scrubbers for removing solids only F23J15/022
• CPC Class Codes: F23J 15/06 of coolers
• CPC Class Codes: F23J 2215/50 Carbon dioxide
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02E 20/30 Technologies for a more efficient combustion or heat usage
• CPC Class Codes: Y02E 20/32 Direct CO2 mitigation
• CPC Class Codes: Y02P 20/151 Reduction of greenhouse gas [GHG] emissions, e.g. CO2

Abstract

The object of the invention is a method for dissolving carbon dioxide from flue or other gas and for the neutralization of the solution obtained. The gas, in which the partial pressure of carbon dioxide is at least 0.4 bar, is led to a dissolution process, where the major part of the carbon dioxide is dissolved into a flow of water. The aqueous solution of carbon dioxide thus obtained is neutralized by passing it through a material containing feldspar minerals, at which time the hydrogen ions of said solution are replaced by ions of alkali or alkaline earth metals, and the aluminum in said material is converted into aluminum compounds that can be separated and utilized.

Claims

1. A method for dissolving carbon dioxide from flue or other gas and for neutralizing the solution obtained, characterized in that said gas, in which the partial pressure of carbon dioxide is at least 0.4 bar, is led into a dissolving process, where the most part of the carbon dioxide is dissolved into a flow of water, and the aqueous solution of carbon dioxide thus obtained is neutralized by passing it through a material containing feldspar minerals, at which time the hydrogen ions of said solution are replaced by ions of alkali or alkaline earth metals, and the aluminum of said material is converted into aluminum compounds that can be separated and utilized.

2. A method according to claim 1, characterized in that the partial pressure of carbon dioxide in said gas is maintained at least at 0.4 bar by using oxygen or air enriched in oxygen in the process in which the carbon dioxide is produced.

3. A method according to claim 1, characterized in that the partial pressure of carbon dioxide in said gas is maintained at least at 0.4 bar by pressurizing air, or an oxygen-containing gas that is brought into the process in which the carbon dioxide is produced, with a compressor.

4. A method according to claim 1, characterized in that the partial pressure of carbon dioxide in said gas is maintained at least at 0.4 bar by pressurizing said gas to a pressure higher than normal pressure with a compressor.

5. A method according to claim 4, characterized in that at least a part of the energy required by said compressor is produced with a turbine, the motive power of which is the heated gas flow that exits from the said washing process and is at a pressure higher than normal pressure.

6. A method according to claim 5, characterized in that at least a part of the heating mentioned in claim 5 is performed by transferring heat in a heat exchanger into said flow from the gas flow entering the said washing process.

7. A method according to claim 1, characterized in that said washing column and neutralization space are placed underground to such a depth that the water brought into the washing process is pressurized to the pressure required by the process.

8. A method according to claim 1, characterized in that a part of the water flow that exits from said neutralization process is returned to said washing process, while the remainder of said flow exits from the process.

9. A method according to claim 1, characterized in that said neutralization process takes place in a fluidized bed containing crushed rock material, in which an aqueous solution of carbon dioxide flows upwards.

10. A method according to claim 1, characterized in that the water flow used in the dissolution consists of partial flows obtained from nature and said neutralization.

11. A method according to claim 1, characterized in that the material containing feldspar minerals is at least in part sand, gravel, or crushed rock.

12. A method according to claim 3, characterized in that at least a part of the energy required by said compressor is produced with a turbine, the motive power of which is the heated gas flow that exits from the said washing process and is at a pressure higher than normal pressure.

13. A method according to claim 12, characterized in that at least a part of the heating mentioned in claim 12 is performed by transferring heat in a heat exchanger into said flow from the gas flow entering the said washing process.