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US 2004/0154220 A1Published application
Reducing sulfur dioxide emissions from coal combustion
AssigneeDemeter Systems LLC
InventorRobert R. Holcomb
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AssigneeDemeter Systems LLC
InventorRobert R. Holcomb
Estimating the term…
A process of treating high sulfur coal to reduce sulfur dioxide emission when the high sulfur coal is burned comprising placing coal in pressure tank (16) of reduced pressure pressure sufficient to fracture a portion of the coal by withdrawing ambient fluids trapped within the coal. The fractured coal is contacted with an aqueous silica colloid composition supersaturated with calcium carbonate via conduit (21), and the majority of the aqueous composition is then removed from contact with the coal. The aqueous composition-treated coal is pressurized in pressure tank (16) under a carbon dioxide atmosphere for a period of time sufficient for the calcium carbonate to enter fractures in the coal produced in the first step.
A process for treating high sulfur coal to reduce sulfur dioxide emissions when the coal is burned, which method comprises:
A high sulfur coal, wherein the coal is vacuum fractured, comprises at least about 0.5 percent by weight sulfur, and further comprises calcium carbonate deposited within fractures in the coal in an amount sufficient to provide a Ca:S molar ratio of at least 0.5.
A process for producing energy from burning high sulfur coal while reducing the sulfur dioxide content of the emission from such burning, which process comprises depositing calcium carbonate within fractures in vacuum-fractured coal and burning the resulting calcium carbonate-containing high sulfur coal at a high temperature.
A process for increasing the amount of calcium sulfate produced as a result of burning high sulfur coal, while at the same time reducing the sulfur dioxide emissions from such burning, which process comprises burning a vacuum fractured high sulfur coal having calcium carbonate deposited within fractures in the coal and recovering the calcium sulfate produced as a result of such burning.
49 The process of claim 45, wherein the coal has a particle size of less than 5 centimeters.
The process of claim 49, wherein the coal has a particle size of about 5 mm to about 2 mm.
The process of claim 49, wherein the coal has a particle size less than 1 in and is burned in a Stoker furnace at about 2400° F. to about 2600° F.
An aqueous composition suitable for treating high sulfur coal to reduce the sulfur dioxide emissions when the treated coal is burned, which composition comprises a supersaturated solution of calcium carbonate integrated with an aqueous silica colloid composition.
A process for making an aqueous composition suitable for treating high sulfur coal to reduce the sulfur dioxide content of the combustion products when the treated coal is burned, which process comprises dissolving calcium carbonate in a strong aqueous alkaline, colloidal silica composition under conditions sufficient to integrate calcium ions into the silica-derived colloidal particles to form a supersaturated solution of calcium carbonate.
An apparatus for treating high sulfur coal with an aqueous composition under pressure, which apparatus comprises:
Dependencies are inferred from the claim text.