PROCESS FOR REMOVAL OF CARBON DIOXIDE FROM COMBUSTION GASES

• US 20100254869A1
• Filed: 05/26/2008
• Published: 10/07/2010
• Est. Priority Date: 05/24/2007
• Status: Active Grant

• Current Assignee: Co2 Purification AS
• Original Assignee: Co2 Purification AS
• Inventors: Thomassen, Thomas
• Granted Patent: US 9,174,161 B2
• Time in Patent Office: Days
• US Class Current: 423/232
• CPC Class Codes: B01D 2247/04 Regenerating the washing fluid
• CPC Class Codes: B01D 2251/108 Halogens or halogen compounds
• CPC Class Codes: B01D 2251/304 of sodium
• CPC Class Codes: B01D 2251/306 of potassium
• CPC Class Codes: B01D 2251/606 Carbonates
• CPC Class Codes: B01D 2257/302 Sulfur oxides
• CPC Class Codes: B01D 2257/404 Nitrogen oxides other than dinitrogen oxide
• CPC Class Codes: B01D 2257/504 Carbon dioxide
• CPC Class Codes: B01D 2257/602 Mercury or mercury compounds
• CPC Class Codes: B01D 47/021 by bubbling the gas through a liquid bath
• CPC Class Codes: B01D 47/08 with rotary nozzles
• CPC Class Codes: B01D 47/16 Apparatus having rotary means, other than rotatable nozzles, for atomising the cleaning liquid
• CPC Class Codes: B01D 53/18 Absorbing units; Liquid distributors therefor B01D3/16, B01D3/26, B01D3/30 take precedence; packing elements B01J19/30, B01J19/32
• CPC Class Codes: B01D 53/185 Liquid distributors
• CPC Class Codes: B01D 53/504 characterised by a specific device
• CPC Class Codes: B01D 53/60 Simultaneously removing sulfur oxides and nitrogen oxides
• CPC Class Codes: B01D 53/62 Carbon oxides
• CPC Class Codes: B01D 53/78 with gas-liquid contact
• CPC Class Codes: Y02A 50/20 Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
• CPC Class Codes: Y02C 20/40 of CO2
• CPC Class Codes: Y02P 70/10 : Greenhouse gas [GHG] capture, material saving, heat recovery or other energy efficient measures, e.g. motor control, characterised by manufacturing processes, e.g. for rolling metal or metal working

Abstract

A device for purifying smoke gases comprising a cylindrical container with a gas inlet at its bottom region and a gas exit for purified gas in its top region, as well as an inlet for washing liquid and an exit for spent washing liquid, wherein the container internally does not include any current baffles so that the gas and liquid can rotate freely, and wherein the container internally has a stirring device of perforated plates, e.g. netting discs, for optimal mixing of gas and fluid. It is also disclosed a process for purifying such smoke gases, wherein such a purification device is used.

Claims

1. A device for purifying with a liquid smoke gases comprising, together or separately, dust, soot, carbon oxides, and nitrogen oxides, wherein the gas and the liquid are mixed intimately by using rotating discs and an alkaline carbonate,

characterized in that the device comprises a container in the form of a cylinder with an inlet in its bottom region for the relevant smoke gas or gasses and an outlet in its top region for purified gas, wherein the container furthermore comprises an inlet for washing liquid and an outlet for spent washing liquid, wherein the container internally does not include stream baffles for the washing liquid so that the gas and liquid can rotate freely, and wherein the container internally includes a set of at least one gas-impenetrable plate with a central hole for gas passage and wherein a stirring device has at least one rotating disc mounted above the central hole of the plate, said discs being rotatable over the gas-impenetrable plates'"'"' central hole together with the washing liquid in the pipe for an improved mixing of gas and liquid in a formed foam.

2. The device according to claim 1,

characterized in that one of the at least one plates comprises a number of open sectors being covered with a netting material.

3. The device according to claim 1,

characterized in that the plate is perforated with openings of between 1 and 10 mm².

4. The device according to claim 1,

characterized in that the plate is smooth.

5. The device according to claim 1,

characterized in that the washing liquid comprises sodium carbonate and/or potassium carbonate and/or ammonium carbonate.

6. The device according to claim 1,

characterized in that the discs of the stirrer have a diameter of between 10 and 99% of the internal diameter of the container.

12. The device according to claim 1,

characterized in that the plate does not comprise current baffles.

13. The device according to claim 2,

characterized in that the plate is perforated with openings of between 1 and 10 mm².

14. The device according to claim 2,

characterized in that the plate is smooth.

15. The device according to claim 3,

characterized in that the plate is smooth.

16. The device according to claim 2,

characterized in that the washing liquid comprises sodium carbonate and/or potassium carbonate and/or ammonium carbonate.

7. A process for purifying smoke gases comprising, together or separately, dust, soot, carbon oxides and nitrogen oxides, wherein the gas is washed with an aqueous solution comprising alkaline or alkaline earth carbonates, whereby alkaline or alkaline earth bicarbonates are formed as a solution or in solid form of precipitated crystals in the aqueous solution through absorption of carbon dioxide,

characterized in that the gas comprising carbon dioxide is passed into the bottom section of a device comprising a container in the form of a cylinder with an inlet in its bottom region for the relevant smoke gas or gasses and an outlet in its top region for purified gas, wherein the container furthermore comprises an inlet for washing liquid and an outlet for spent washing liquid, wherein the container internally does not include stream baffles for the washing liquid so that the gas and liquid can rotate freely, and wherein the container internally includes a set of at least one gas-impenetrable plate with a central hole for gas passage and wherein a stirring device has at least one rotating disc mounted above the central hole of the plate, said discs being rotatable over the gas-impenetrable plates'"'"' central hole together with the washing liquid in the pipe for an improved mixing of gas and liquid in a formed foam, and

wherein purified gas is evacuated at the top section of the device, the aqueous solution being stirred in the device for intimate mixing of gas an the aqueous solution, and wherein the aqueous solution, optionally being added sodium chloride and alkaline carbonates, is passed to a stirring tank from which the solution with stirred carbonate is pumped to the reactor wherefrom said solution now including a solid, passes to a sedimentation device wherein fluid and solids are separated for re-use of the filtrate, and wherein the solids are passed for extraction of CO₂ gas and alkaline carbonate for re-use.

8. The process according to claim 7,

characterized in that the gas that is to be purified is refrigerated to a temperature between 10 and 60°

C.

9. The process according to claim 7,

characterized in that the alkaline carbonate comprises sodium carbonate.

10. The process according to claim 7,

characterized in that the aqueous solution is added chlorite comprising sodium hypochlorite for the removal of NO_x and optionally comprising SO₂ and Hg.

11. The process according to claim 7,

characterized in that there is added a salt comprising at least 30 grams NaCl/liter, or sea water, for an improved precipitation of sodium bicarbonate.

17. The process according to claim 8,

characterized in that the alkaline carbonate comprises sodium carbonate.

18. The process according to claim 8,

characterized in that the aqueous solution is added chlorite comprising sodium hypochlorite for the removal of NO_x and optionally comprising SO₂ and Hg.

19. The process according to claim 9,

characterized in that the aqueous solution is added chlorite comprising sodium hypochlorite for the removal of NO_x and optionally comprising SO₂ and Hg.

20. The process according to claim 8,

characterized in that there is added a salt comprising at least 30 grams NaCl/liter, or sea water, for an improved precipitation of sodium bicarbonate.