System and method for sequestration and separation of mercury in combustion exhaust gas aqueous scrubber systems
First Claim
1. A process for removal of mercury from a combustion exhaust gas stream in a combustion exhaust gas purification scheme that includes a combustion exhaust scrubber system that uses an aqueous liquid to remove acid gases from the combustion exhaust gas, the process comprising:
- providing a powdered mercury sorbent comprising activated carbon that has been modified with a sulfur species;
introducing the powdered mercury sorbent into the aqueous liquid in the scrubber system; and
after introduction of the mercury sorbent into the aqueous liquid, separating at least some of the mercury sorbent and at least some of the aqueous liquid.
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Abstract
A process, system and sorbent for removal of mercury from a combustion exhaust gas stream in a combustion exhaust gas purification scheme that includes a combustion exhaust scrubber system that uses an aqueous liquid to remove acid gases from the combustion exhaust gas. A powdered mercury sorbent is used. The sorbent is introduced into the aqueous scrubber liquid in the scrubber system. After introduction of the mercury sorbent into the scrubber liquid, at least some of the mercury sorbent is separated from the scrubber liquid.
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Citations
29 Claims
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1. A process for removal of mercury from a combustion exhaust gas stream in a combustion exhaust gas purification scheme that includes a combustion exhaust scrubber system that uses an aqueous liquid to remove acid gases from the combustion exhaust gas, the process comprising:
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providing a powdered mercury sorbent comprising activated carbon that has been modified with a sulfur species; introducing the powdered mercury sorbent into the aqueous liquid in the scrubber system; and after introduction of the mercury sorbent into the aqueous liquid, separating at least some of the mercury sorbent and at least some of the aqueous liquid. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A process for removal of mercury from a combustion exhaust gas stream in a combustion exhaust gas purification scheme that includes a combustion exhaust scrubber system that uses an aqueous liquid to remove acid gases from the combustion exhaust gas, the process comprising:
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providing a powdered mercury sorbent in which at least some of the mercury sorbent is magnetic; introducing the powdered mercury sorbent into the aqueous liquid in the scrubber system; and after introduction of the mercury sorbent into the aqueous liquid, separating at least some of the mercury sorbent and at least some of the aqueous liquid. - View Dependent Claims (9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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21. A process for removal of mercury from a combustion exhaust gas stream in a combustion exhaust gas purification scheme that includes a combustion exhaust scrubber system that uses an aqueous liquid to remove acid gases from the combustion exhaust gas, the process comprising:
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providing a powdered mercury sorbent in which the mercury sorbent is mixed with a powder dispersing agent introducing the powdered mercury sorbent into the aqueous liquid in the scrubber system; and after introduction of the mercury sorbent into the aqueous liquid, separating at least some of the mercury sorbent and at least some of the aqueous liquid. - View Dependent Claims (22, 23, 24)
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25. A system for removal of mercury from a flue gas stream, comprising:
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a wet flue gas desulfurization (FGD) scrubber system that uses an aqueous scrubbing liquor containing an alkaline substance that is sprayed into an absorber vessel to remove sulfur oxides from the flue gas through reaction between the alkaline substance and the sulfur oxides, the scrubber system comprising a scrubbing liquor recirculation loop that returns scrubbing liquor from the bottom portion of the absorber vessel to be sprayed in the vessel; powdered, magnetic mercury sorbent; a mercury sorbent storage system; a feeder for introducing the mercury sorbent into the scrubbing liquor recirculation loop; equipment for withdrawing a portion of the scrubbing liquor from the recirculation loop as a spent sorbent and reaction product stream; a magnetic separator that receives the spent stream and removes at least some of the mercury sorbent from the spent stream; and an inertial separation device downstream of the magnetic separator for removing at least some of the reaction product from the spent stream.
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26. A mercury sorbent that can be used to remove solubilized mercury from an aqueous combustion exhaust gas stream scrubber liquor, comprising:
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a powdered solid sorbent with a particle size such that about 90% of the particles are smaller than about 25 microns, in which the powdered solid sorbent comprises activated carbon that has been modified with at least a sulfur species; and a magnetic substance coupled to the solid sorbent. - View Dependent Claims (27, 28, 29)
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Specification