Sorbents for the oxidation and removal of mercury
DCFirst Claim
1. A method for reducing mercury in a mercury-containing gas, the method comprising:
- combusting coal in a combustion chamber, the coal comprising an additive comprising Br2, HBr, a bromide compound, or a combination thereof, to form the mercury-containing gas; and
collecting mercury in the mercury-containing gas with a sorbent added to the mercury-containing gas, the sorbent comprising activated carbon.
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Abstract
A promoted activated carbon sorbent is described that is highly effective for the removal of mercury from flue gas streams. The sorbent comprises a new modified carbon form containing reactive forms of halogen and halides. Optional components may be added to increase reactivity and mercury capacity. These may be added directly with the sorbent, or to the flue gas to enhance sorbent performance and/or mercury capture. Mercury removal efficiencies obtained exceed conventional methods. The sorbent can be regenerated and reused. Sorbent treatment and preparation methods are also described. New methods for in-flight preparation, introduction, and control of the active sorbent into the mercury contaminated gas stream are described.
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Citations
30 Claims
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1. A method for reducing mercury in a mercury-containing gas, the method comprising:
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combusting coal in a combustion chamber, the coal comprising an additive comprising Br2, HBr, a bromide compound, or a combination thereof, to form the mercury-containing gas; and collecting mercury in the mercury-containing gas with a sorbent added to the mercury-containing gas, the sorbent comprising activated carbon. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28)
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29. A method of separating mercury from a mercury-containing gas, the method comprising:
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combusting coal in a combustion chamber, wherein the coal comprises added Br2, HBr, bromide compound, or a combination thereof, added to the coal before the coal enters the combustion chamber, or the combustion chamber comprises added Br2, HBr, bromide compound, or a combination thereof, or a combination thereof; and collecting mercury in the mercury-containing gas with a sorbent added to the mercury-containing gas, the sorbent comprising activated carbon.
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30. A method of separating mercury from a mercury-containing gas, the method comprising:
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combusting coal in a combustion chamber, to provide the mercury-containing gas, wherein the mercury-containing gas comprises a halogen or halide promoter comprising HBr, Br−
, or a combination thereof, whereinthe coal comprises added Br2, HBr, bromide compound, or a combination thereof, added to the coal before the coal enters the combustion chamber, or the combustion chamber comprises added Br2, HBr, bromide compound, or a combination thereof, or a combination thereof; collecting mercury in the mercury-containing gas with a sorbent added to the mercury-containing gas, the sorbent comprising activated carbon; separating the sorbent contacted with the mercury from the mercury-containing gas; measuring the mercury content of the mercury-containing gas; and modifying, in response to the measured mercury content of the mercury-containing gas, an injection rate of injecting the sorbent into the mercury-containing gas, an amount of the Br2, HBr, bromide compound, or a combination thereof, added to the coal or the combustion chamber, or a combination thereof.
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Specification