Method and apparatus for catalyzing seawater aeration basins

Patent metadata

Field	Value
Publication number	US-9550688-B2
Application number	US-201314030441-A
Country	US
Kind code	B2
Filing date	Sep 18, 2013
Priority date	Sep 18, 2013
Publication date	Jan 24, 2017
Grant date	Jan 24, 2017

Abstract

An apparatus and method for producing a catalyst rich seawater useful to catalyze oxidation reactions in a flue gas desulfurization system seawater aeration basin to obtain a treated seawater.

First claim

The invention claimed is:

1. An apparatus comprising:
a particulate collection device operative to remove particulates from flue gas, the removed particulates supplied via a first duct to a catalyst unit;
a seawater flue gas desulfurization system producing an acidic liquid with a portion of the acidic liquid supplied via a second duct to the catalyst unit, the second duct separate from the first duct;
the catalyst unit operable to periodically contain the acidic liquid and particulates supplied from the particulate collection device for leaching of catalyst agents from the particulates into the acidic liquid to produce a catalyst rich liquid; and
a seawater aeration basin fluidly connected to the catalyst unit operable to contain the catalyst rich liquid from the catalyst unit and effluent seawater supplied from the seawater flue gas desulfurization system, to catalyze oxidation of sulphite ions to inert sulfate ions within effluent seawater contained therein to produce a treated seawater.

2. The apparatus according to claim 1 further comprising an agitator in the catalyst unit operable to mix and agitate the acidic liquid and particulates to promote catalyst agent leaching from the particulates.

3. The apparatus according to claim 1 , wherein the mixed acidic liquid and particulates contained in the catalyst unit are retained for a period of approximately 1 minute to approximately 20 minutes for leaching of catalyst agents from the particulates.

4. The apparatus according to claim 1 , wherein the particulates comprise dust and ash.

5. The apparatus according to claim 1 , wherein the catalyzing agents comprise iron, manganese or a combination thereof.

6. The apparatus according to claim 1 , wherein the portion of acidic liquid supplied from the seawater flue gas desulfurization system to the catalyst unit is approximately 10% or less.

7. The apparatus according to claim 1 , further comprising a neutralization basin containing treated seawater supplied from the seawater aeration basin, for treated seawater neutralization with a neutralization agent supplied to the neutralization basin for contact with the treated seawater therein to obtain neutralized seawater.

8. The apparatus according to claim 1 , wherein a neutralization agent comprising limestone, fresh ocean seawater or a combination thereof is used to neutralize the treated seawater.

9. A method comprising:
providing a particulate collection device operative to remove particulates from flue gas, the removed particulates supplied via a first duct to a catalyst unit;
providing a seawater flue gas desulfurization system producing an acidic liquid with a portion of the acidic liquid supplied via a second duct to the catalyst unit, the second duct separate from the first duct;
providing the catalyst unit operable to periodically contain the acidic liquid and particulates supplied from the particulate collection device for leaching of catalyst agents from the particulates to the acidic liquid to produce a catalyst rich liquid; and
providing a seawater aeration basin fluidly connected to the catalyst unit operable to contain the catalyst rich liquid from the catalyst unit and effluent seawater supplied from the seawater flue gas desulfurization system, to catalyze reactions of suphite ions to inert sulfate ions within effluent seawater contained therein to produce a treated water.

10. The method according to claim 9 further comprising providing an agitator in the catalyst unit operable to mix and agitate the acidic liquid and particulates to promote catalyst agent leaching from the particulates.

11. The method according to claim 9 , wherein the mixed acidic liquid and particulates contained in the catalyst unit are retained for a period of approximately 1 minute to approximately 20 minutes for leaching of catalyst agents from the particulates.

12. The method according to claim 9 , wherein the particulates comprise dust and ash.

13. The method according to claim 9 , wherein the catalyzing agents comprise iron, manganese or a combination thereof.

14. The method according to claim 9 , wherein the portion of acidic liquid supplied from the seawater flue gas desulfurization system to the catalyst unit is approximately 10% or less.

15. The method according to claim 9 , further comprising providing a neutralization basin containing treated seawater supplied from the seawater aeration basin, for treated seawater neutralization with a neutralization agent comprising limestone, fresh ocean seawater or a combination thereof, supplied to the neutralization basin for contact with the treated seawater therein to obtain a neutralized seawater.

Assignees

• Alstom Technology Ltd
• General Electric Technology Gmbh

Inventors

• Laslo Dennis James
• Gansley Raymond R

Classifications

• C02F1/725 Primary

  by catalytic oxidation · CPC title

• B01D53/504

  characterised by a specific device · CPC title

• C02F1/74

  with air (aeration of stretches of water C02F7/00) · CPC title

• F23J2219/40

  Sorption with wet devices, e.g. scrubbers · CPC title

• C02F2103/18

  from the purification of gaseous effluents · CPC title