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US 10,159,931 B2Granted
Control of wet scrubber oxidation inhibitor and byproduct recovery
AssigneeADA-ES, Inc.
InventorsSharon Sjostrom, Kenneth E. Baldrey, Constance Senior
Life of this patent
Estimating the term…
Abstract
The present disclose is directed to a method for controlling iodine levels in wet scrubbers, and, in particular, recirculating wet scrubbers by removing the iodine from the scrubbing solution, such as by using ion exchange, absorption, adsorption, precipitation, filtration, solvent extraction, ion pair extraction, and an aqueous two-phase extraction.
Claims41
A method, comprising:
- receiving a waste gas comprising an acid gas and at least one of elemental iodine and an iodine-containing composition;
- passing the waste gas through a wet scrubber to remove at least a portion of the acid gas and the at least one of elemental iodine and an iodine-containing composition from the waste gas and form a scrubbing solution comprising at least one of an acid derived from the acid gas and a derivative thereof and the at least one of elemental iodine and an iodine-containing composition;
- removing, from the scrubbing solution, at least a portion of the at least one of elemental iodine and an iodine-containing composition, thereby reducing a concentration of the at least one of elemental iodine and an iodine-containing composition in the scrubbing solution;
- and
- applying at least some of the removed at least a portion of the at least one of elemental iodine and an iodine-containing composition to coal, wherein the coal and the removed at least a portion of the at least one of elemental iodine and an iodine-containing composition are combusted to form the waste gas.
2 more elements
A method, comprising:
- receiving a waste gas comprising an acid gas and elemental mercury;
- contacting an iodine-containing additive with the waste gas upstream of a wet scrubber to oxidize elemental mercury in the waste gas to a non-elemental mercury
- passing the waste gas through a wet scrubber to remove at least a portion of the acid gas and at least one of elemental iodine and an iodine-containing composition derived from the iodine-containing additive and form a scrubbing solution comprising at least one of an acid and salt derived from the removed at least a portion of the acid gas and the at least one of elemental iodine and an iodine-containing composition;
- removing, from the scrubbing solution, at least a portion of the at least one of elemental iodine and an iodine-containing composition, thereby reducing a concentration of the at least one of elemental iodine and an iodine-containing composition in the scrubbing solution;
- and
- applying at least some of the removed at least a portion of the at least one of elemental iodine and an iodine-containing composition to coal, wherein the coal and removed at least a portion of the at least one of elemental iodine and an iodine-containing composition applied to the coal are combusted to form the received waste gas.
3 more elements
A method, comprising:
- receiving a waste gas comprising at least one of elemental iodine and an iodine-containing composition;
- passing the waste gas through a wet scrubber to remove the at least one of elemental iodine and an iodine-containing composition from the waste gas and form a scrubbing solution comprising the at least one of elemental iodine and an iodine-containing composition;
- and
- removing, from the scrubbing solution, at least a portion of the at least one of elemental iodine and an iodine-containing composition by one or more of ion exchange, absorption, adsorption, precipitation, filtration, solvent extraction, ion pair extraction, and an aqueous two-phase extraction, thereby reducing a concentration of the at least one of elemental iodine and an iodine-containing composition in the scrubbing solution;
- and
- applying the removed at least a portion of the at least one of elemental iodine and an iodine-containing composition to coal, wherein the coal and the removed at least a portion of the at least one of elemental iodine and an iodine-containing composition applied to the coal are combusted to form the received waste gas.
3 more elements
A method, comprising:
- passing a waste gas comprising an acid gas and at least one of elemental iodine and an iodine-containing composition through a wet scrubber to remove the at least one of elemental iodine and an iodine-containing composition from the waste gas and form a scrubbing solution comprising the at least one of elemental iodine and an iodine-containing composition;
- sorbing at least a portion of the at least one of elemental iodine and an iodine-containing composition on a carbonaceous material;
- and
- recovering the carbonaceous material comprising the sorbed at least a portion of the at least one of elemental iodine and an iodine-containing composition from the scrubbing solution wherein the recovered carbonaceous material is one or more of:
- (i) introduced to the waste gas as the iodine-containing additive;
- and
- (ii) charged to coal and, thereafter, combusted with the coal to form the waste gas.
4 more elements
A method, comprising:
- contacting, upstream of a wet scrubber, an iodine-containing additive with a waste gas comprising an acid gas and elemental mercury to oxidize the elemental mercury in the waste gas to a non-elemental mercury;
- passing the waste gas through the wet scrubber to remove at least a portion of at least one of elemental iodine and an iodine-containing composition derived from the iodine-containing additive to form a scrubbing solution comprising the removed at least a portion of at least one of elemental iodine and an iodine-containing composition derived from the iodine-containing additive and a treated waste gas comprising another portion of the at least one of elemental iodine and an iodine-containing composition not removed by the wet scrubber;
- sorbing, on a carbonaceous material, the at least a portion of the mercury and at least a portion of the removed portion of the at least one of elemental iodine and an iodine-containing composition;
- and
- removing the carbonaceous material from the scrubbing solution to form a recovered carbonaceous material, wherein the recovered carbonaceous material is one or more of:
- (i) introduced to the waste gas as the iodine-containing additive;
- and
- (ii) charged to coal and, thereafter, combusted with the coal to form the waste gas.
5 more elements
A method, comprising:
- passing a waste gas comprising an acid gas and at least one of elemental iodine and an iodine-containing composition through a wet scrubber to remove the at least one of elemental iodine and an iodine-containing composition from the waste gas and form a scrubbing solution comprising the at least one of elemental iodine and an iodine-containing composition;
- sorbing at least a portion of the at least one of elemental iodine and an iodine-containing composition onto a carbonaceous material;
- and
- recovering the carbonaceous material from the scrubbing solution by one or more of ion exchange, absorption, adsorption, precipitation, filtration, solvent extraction, ion pair extraction, and an aqueous two-phase extraction, thereby reducing a concentration of the at least one of elemental iodine and an iodine-containing composition in the scrubbing solution and wherein the recovered carbonaceous material is one or more of:
- (i) introduced to the waste gas as the iodine-containing additive;
- and
- (ii) charged to coal and, thereafter, combusted with the coal to form the waste gas.
4 more elements
Dependencies are inferred from the claim text.