Dynamic halogenation of sorbents for the removal of mercury from flue gases
OwnerWilliam Downs, George Farthinginventors
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Abstract
A halogen-containing gas is injected into a flowing transport air/sorbent stream at a point close to the point where the sorbent and transport air first mix to maximize the residence time available for the halogen-containing compound to be adsorbed onto the sorbent surface prior to the sorbent being injected into a flue gas containing mercury. This process maximizes the benefit and utilization of the halogen-containing reagent by placing it exactly where it is needed to facilitate elemental mercury removal—on the surface of the sorbent. The sorbent particles with their loading of adsorbed halogen-containing reagent enter the flue gas with a high reactivity for the removal of elemental mercury.
Claims13
A method of removing a portion of the elemental mercury in a flue gas created during a combustion process, comprising:
- providing four streams, wherein the first stream comprises a halogen containing reagent, the second stream comprises a sorbent, the third stream comprises conveyance air, and the fourth stream comprises a flue gas containing elemental mercury;
- combining the first, second, and third streams wherein the halogen containing reagent is adsorbed onto the sorbent;
- injecting the combined stream into the fourth stream;
- adsorbing the elemental mercury onto the sorbent;
- and
- removing the sorbent from the fourth stream.
Dependencies are inferred from the claim text.