SORBENTS FOR THE OXIDATION AND REMOVAL OF MERCURY
First 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, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, to form the mercury-containing gas;
collecting mercury in the mercury-containing gas on a sorbent comprising a carbon sorbent, a non-carbon sorbent, or a combination thereof.
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Accused Products
Abstract
A promoted carbon and/or non-carbon base sorbent are described that are highly effective for the removal of mercury from flue gas streams. The promoted sorbent comprises a carbon and/or non-carbon base sorbent that has reacted with and contains forms of halogen and halides. Optional components may be added to increase and/or preserve reactivity and mercury capacity. These may be added directly with the base sorbent, or in-flight within a gas stream (air, flue gas, etc.), to enhance base sorbent performance and/or mercury capture. Mercury removal efficiencies obtained exceed conventional methods. The promoted sorbent can be regenerated and reused. Base sorbent treatment and preparation methods are also described. New methods for in-flight preparation, introduction, and control of the active base 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, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, to form the mercury-containing gas; collecting mercury in the mercury-containing gas on a sorbent comprising a carbon sorbent, a non-carbon sorbent, or a combination thereof. - 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)
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28. 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 coal comprises added Br2, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, added to the coal upstream of the combustion chamber, or the combustion chamber comprises added Br2, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, or a combination thereof; injecting a sorbent into the mercury-containing gas downstream of the combustion chamber, the sorbent comprising a carbon sorbent, a non-carbon sorbent, or a combination thereof, contacting mercury in the mercury-containing gas with the sorbent; and separating the sorbent contacted with the mercury from the mercury-containing gas.
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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, to provide the mercury-containing gas, wherein the mercury-containing gas comprises a halogen or halide promoter comprising HBr, HI, Br−
, I−
, or a combination thereof, whereinthe coal comprises added Br2, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, added to the coal before the coal enters the combustion chamber, or the combustion chamber comprises added Br2, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, or a combination thereof; injecting a sorbent into the mercury-containing gas downstream of the combustion chamber, the sorbent comprising a carbon sorbent, a non-carbon sorbent, or a combination thereof; contacting mercury in the mercury-containing gas with the sorbent; and separating the sorbent contacted with the mercury from the mercury-containing gas.
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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, HI, Br−
, I−
, or a combination thereof, whereinthe coal comprises added Br2, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, added to the coal before the coal enters the combustion chamber, or the combustion chamber comprises added Br2, I2, HBr, HI, a bromide compound, an iodide compound, or a combination thereof, or a combination thereof; injecting a sorbent into the mercury-containing gas downstream of the combustion chamber, the sorbent comprising a carbon sorbent, a non-carbon sorbent, or a combination thereof, such that the sorbent reacts with the halogen or halide promoter in the mercury-containing gas to form a promoted sorbent; contacting mercury in the mercury-containing gas with the promoted sorbent; separating the promoted 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, an injection rate of injecting the sorbent into the mercury-containing gas, an amount of the Br2, I2, HBr, HI, the bromide compound, the iodide compound, or a combination thereof, added to the coal or the combustion chamber, or a combination thereof.
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Specification