Method and apparatus for removing mercury species from hot flue gas
First Claim
1. A method of removing mercury from flue gas containing mercury and particulate solids emanating from a fossil-fuel energy conversion plant and passing through a flue gas duct, said method comprising the following steps:
- (a) contacting the mercury in the flue gas with a solution containing at least one chloride-containing salt dissolved in a solvent by injecting the solution into the flue gas duct at an injection location, in order to oxidize mercury into HgCl2;
(b) heating the solution prior to or after step (a) to at least about 300°
C.; and
(c) removing oxidized mercury from the flue gas with means for removing particulate solids from the flue gas.
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Accused Products
Abstract
A method of removing mercury from flue gas containing mercury and particulate solids emanating from a fossil-fuel energy conversion plant and passing through a flue gas duct. The method includes (a) contacting the mercury in the flue gas with a solution containing at least one chloride-containing salt dissolved in a solvent by injecting the solution into the flue gas duct at an injection location, in order to oxidize mercury into HgCl2, (b) heating the solution prior to or after step (a) to at least about 300° C., and (c) removing oxidized mercury from the flue gas with a device for removing particulate solids from the flue gas.
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Citations
32 Claims
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1. A method of removing mercury from flue gas containing mercury and particulate solids emanating from a fossil-fuel energy conversion plant and passing through a flue gas duct, said method comprising the following steps:
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(a) contacting the mercury in the flue gas with a solution containing at least one chloride-containing salt dissolved in a solvent by injecting the solution into the flue gas duct at an injection location, in order to oxidize mercury into HgCl2;
(b) heating the solution prior to or after step (a) to at least about 300°
C.; and
(c) removing oxidized mercury from the flue gas with means for removing particulate solids from the flue gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. An apparatus for removing mercury from flue gas containing mercury and particulate solids emanating from a fossil-fuel energy conversion plant, said apparatus comprising:
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a flue gas duct for conveying the flue gas containing mercury and particulate solids from the fossil-fuel energy conversion plant;
means for injecting a solution of chloride-containing salt dissolved in a solvent into an upstream portion of the flue gas duct, for oxidizing mercury in the flue gas to HgCl2; and
means for removing particulate solids and oxidized mercury condensed on the particulate solids from the flue gas. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23, 24)
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25. An apparatus for removing mercury from flue gas containing mercury and particulate solids emanating from a fossil energy conversion plant, said apparatus comprising:
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a flue gas duct for conveying flue gas containing mercury and particulate solids;
means for heating a solution of chloride-containing salt dissolved in a solvent to at least about 300°
C. and means for injecting the solution into said flue gas duct, for oxidizing mercury in the flue gas to HgCl2; and
means for removing particulate solids and oxidized mercury condensed on the particulate solids from the flue gas. - View Dependent Claims (26, 27, 28, 29, 30, 31, 32)
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Specification