Sorbents for coal combustion
First Claim
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1. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
- applying a sorbent composition onto the fuel, wherein the sorbent composition comprises a halogen compound and a source of calcium;
delivering the fuel with the sorbent composition applied into a furnace of the facility;
combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash;
removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace;
measuring the level of mercury and sulfur remaining in the combustion gases after capture of the ash; and
adjusting the rate of calcium addition according to the measured level of sulfur.
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Abstract
Sorbent compositions containing halogen and calcium are added to coal to mitigate the release of sulfur and/or other harmful elements, including mercury, into the environment during combustion of coal containing natural levels of mercury.
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Citations
47 Claims
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1. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel, wherein the sorbent composition comprises a halogen compound and a source of calcium; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of calcium addition according to the measured level of sulfur. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and/or sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of sorbent addition according to the measured level of mercury and/or sulfur, wherein the sorbent composition comprises an organic halogen compound and a source of calcium. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19)
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20. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and/or sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of sorbent addition according to the measured level of mercury and/or sulfur, wherein the sorbent composition comprises a halogen compound and a source of calcium selected from calcium oxide, calcium hydroxide, calcium carbonate, calcium bicarbonate, calcium sulfate, calcium bisulfate, calcium nitrate, calcium nitrite, calcium acetate, calcium citrate, calcium phosphate, and calcium hydrogen phosphate.
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21. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and/or sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of sorbent addition according to the measured level of mercury and/or sulfur, wherein the sorbent composition comprises a halogen compound and an organic calcium compound.
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22. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and/or sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of sorbent addition according to the measured level of mercury and/or sulfur, wherein the sorbent composition comprises a halogen compound and a basic powder selected from the group consisting of Portland cement, cement kiln dust, and lime kiln dust. - View Dependent Claims (23, 24, 25, 26, 27, 28)
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29. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and/or sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of sorbent addition according to the measured level of mercury and/or sulfur, wherein the sorbent composition comprises a halogen compound and an aluminosilicate clay. - View Dependent Claims (30, 31, 32, 33, 34, 35, 36, 37, 38)
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39. A method for reducing emissions of mercury arising from combustion of mercury containing fuels in a fuel burning facility, the method comprising:
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applying a sorbent composition onto the fuel; delivering the fuel with the sorbent composition applied into a furnace of the facility; combusting the fuel with the sorbent composition in the furnace to produce combustion gases and ash; removing the ash from the combustion gases by capturing it in a particulate removal system disposed in a convective pathway of the facility downstream of the furnace; measuring the level of mercury and/or sulfur remaining in the combustion gases after capture of the ash; and adjusting the rate of sorbent addition according to the measured level of mercury and/or sulfur, wherein the sorbent composition comprises an iodine compound and a source of calcium. - View Dependent Claims (40, 41, 42, 43, 44, 45, 46, 47)
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Specification