Sorbents for coal combustion
First Claim
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1. A method for reducing the amount of sulfur gases released into the atmosphere from a coal burning plant, comprising adding a sorbent to the coal prior to combustion;
- delivering the coal into a furnace;
burning the coal in the furnace to produce ash and flue gases; and
measuring the level of sulfur gases in the flue gas;
wherein the sorbent comprises calcium iodide.
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Abstract
Sorbent compositions containing calcium and iodine are added to coal to mitigate the release of mercury and/or other harmful elements into the environment during combustion of coal containing natural levels of mercury.
216 Citations
20 Claims
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1. A method for reducing the amount of sulfur gases released into the atmosphere from a coal burning plant, comprising adding a sorbent to the coal prior to combustion;
- delivering the coal into a furnace;
burning the coal in the furnace to produce ash and flue gases; and
measuring the level of sulfur gases in the flue gas;
wherein the sorbent comprises calcium iodide. - View Dependent Claims (2, 3, 4, 5, 6, 7, 17, 18, 19)
- delivering the coal into a furnace;
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8. A method for reducing emissions of sulfur and/or other harmful elements arising from combustion of coal in a coal burning facility, the method comprising:
- applying a sorbent composition comprising calcium and iodine onto coal;
burning the coal containing the calcium and iodine sorbent composition to produce ash and combustion gases;
measuring a level of sulfur in the combustion gases; and
adjusting the amount of calcium added onto the coal based on the measured level of sulfur. - View Dependent Claims (9, 10, 11, 12, 13, 14)
- applying a sorbent composition comprising calcium and iodine onto coal;
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15. A method of reducing mercury emissions that arise from combustion of coal in the furnace of a coal burning facility, the method comprising applying a mercury sorb ent onto the coal upstream of the furnace, or into the convective pathway of the furnace where the temperature is 1500°
- F. to 2700°
F., and measuring the level of mercury escaping from the coal burning facility, wherein the mercury sorbent comprises potassium iodide. - View Dependent Claims (16)
- F. to 2700°
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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:
- applying a mercury sorbent and a sulfur sorbent composition onto the fuel;
delivering the fuel with the sorbent compositions applied into a furnace of the facility;
combusting the fuel with the sorbent compositions 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;
wherein the mercury sorbent composition comprises an iodine compound selected from sodium iodide and potassium iodide and the sulfur sorbent composition comprises calcium, silica, and alumina.
- applying a mercury sorbent and a sulfur sorbent composition onto the fuel;
Specification