Sorbents for the oxidation and removal of mercury
DCFirst Claim
1. A method for treating a mercury-containing gas, the method comprising:
- combusting a mixture comprising coal, pyrolysis char, and an additive comprising HBr, a bromide compound, or a combination thereof, to form the mercury-containing, gas; and
adding a particulate sorbent material comprising activated carbon into the mercury-containing gas.
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Accused Products
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.
197 Citations
29 Claims
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1. A method for treating a mercury-containing gas, the method comprising:
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combusting a mixture comprising coal, pyrolysis char, and an additive comprising HBr, a bromide compound, or a combination thereof, to form the mercury-containing, gas; and adding a particulate sorbent material comprising activated carbon into the mercury-containing gas. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29)
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14. A method for treating a mercury-containing gas, the method comprising:
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combusting coal in a combustor comprising pyrolysis char and an additive comprising HBr, a bromide compound, or a combination thereof, to form the mercury-containing gas; and adding a particulate sorbent material comprising activated carbon into the mercury-containing gas. - View Dependent Claims (15)
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16. A method for treating a mercury-containing gas, the method comprising:
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combusting coal in a combustor and adding within the combustor a pyrolysis char promoted by an additive comprising HBr, a bromide compound, or a combination thereof, to form the mercury-containing gas; and adding a particulate sorbent material comprising activated carbon into the mercury-containing gas.
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17. A method for treating a mercury-containing gas, the method comprising:
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combusting a mixture comprising coal, pyrolysis char, and an additive comprising HBr, a bromide compound, or a combination thereof, to form the mercury-containing gas; and adding a sorbent material comprising activated carbon into the mercury-containing gas.
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Specification