System and method for protection of SCR catalyst and control of multiple emissions
First Claim
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1. A method for increasing the active life of an SCR catalyst, the method comprising the steps of:
- (a) providing at least one kaolin-bearing compound to a combustion zone or flue gas stream of a furnace, or boiler, prior to entry of the flue gas into an SCR; and
(b) permitting the at least one kaolin-bearing compound to react with any gaseous potassium and/or sodium compounds, or potassium- and/or sodium-containing compounds present in the combustion zone or flue gas prior to the entry of the flue gas into the SCR.
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Abstract
The present invention relates generally to the field of emission control equipment for boilers, heaters, kilns, or other flue gas-, or combustion gas-, generating devices (e.g., those located at power plants, processing plants, etc.) and, in particular to a new and useful method and apparatus for preventing the poisoning and/or contamination of an SCR catalyst. In another embodiment, the method and apparatus of the present invention is designed to protect an SCR catalyst, while simultaneously providing emission control.
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Citations
26 Claims
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1. A method for increasing the active life of an SCR catalyst, the method comprising the steps of:
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(a) providing at least one kaolin-bearing compound to a combustion zone or flue gas stream of a furnace, or boiler, prior to entry of the flue gas into an SCR; and (b) permitting the at least one kaolin-bearing compound to react with any gaseous potassium and/or sodium compounds, or potassium- and/or sodium-containing compounds present in the combustion zone or flue gas prior to the entry of the flue gas into the SCR. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for increasing the active life of an SCR catalyst, the method comprising the steps of:
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(i) providing at least one kaolin-bearing compound to a combustion zone of a furnace or boiler; and (ii) permitting the at least one kaolin-bearing compound to react with any gaseous potassium and/or sodium compounds, or potassium- and/or sodium-containing compounds present in the combustion zone prior to the entry of the flue gas into an SCR, wherein the kaolin-bearing compound is selected from one or more kaolin-containing clays, kaolinite-containing clays, kaolinite, or mixtures of two or more thereof. - View Dependent Claims (8, 9, 10)
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11. A method for increasing the active life of an SCR catalyst while concurrently controlling mercury in a gas, the method comprising the steps of:
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(I) providing at least one kaolin-bearing compound to a combustion zone or flue gas stream of a furnace, or boiler, prior to entry of the flue gas into an SCR; (II) providing at least one iron-bearing halide compound to a combustion zone or flue gas stream of a furnace, or boiler, prior to entry of the flue gas into an SCR; (III) permitting the kaolin portion of the at least one kaolin-bearing compound to react with any gaseous potassium and/or sodium compounds, or potassium- and/or sodium-containing compounds present in the combustion zone or flue gas prior to the entry of the flue gas into the SCR; (IV) permitting the iron portion of the at least one iron-bearing halide compound to react with any gaseous phosphorus compounds, or phosphorus-containing compounds present in the combustion zone or flue gas prior to the entry of the flue gas into the SCR; and (V) permitting the halide portion of the at least one iron-bearing halide compound to react with any gaseous mercury compounds, or mercury-containing compounds, present in the combustion zone or flue gas. - View Dependent Claims (12, 13, 14, 15, 16, 17, 18)
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19. A method for sequestering one or more potassium and/or sodium compounds, or potassium- and/or sodium-containing compounds, in the form of one or more less reactive sodium aluminosilicate-containing, or potassium aluminosilicate-containing, compounds, as well as sequestering one or more phosphorus compounds, or phosphorus-containing compounds, in the form of one or more less reactive iron-phosphorus-containing compounds while concurrently sequestering mercury, the method comprising the steps of:
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(1) providing at least one kaolin-bearing compound to a combustion zone or flue gas stream of a furnace, or boiler; (2) providing at least one iron-bearing halide compound to a combustion zone or flue gas stream of a furnace, or boiler; (3) permitting the kaolin portion of the at least one kaolin-bearing compound to react with any gaseous potassium and/or sodium compounds, or potassium- and/or sodium-containing compounds present in the combustion zone or flue gas to form one or more less reactive sodium aluminosilicate-containing, or potassium aluminosilicate-containing, compounds; (4) permitting the iron portion of the at least one iron-bearing halide compound to react with any gaseous phosphorus compounds, or phosphorus-containing compounds, present in the combustion zone or flue gas to form one or more less reactive iron-phosphorus-containing compounds; and (5) permitting the halide portion of the at least one iron-bearing halide compound to react with any gaseous mercury compounds, or mercury-containing compounds, present in the combustion zone or flue gas. - View Dependent Claims (20, 21, 22, 23, 24, 25, 26)
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Specification