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US 7,332,002 B2Granted
Low sulfur coal additive for improved furnace operation
AssigneeADA Environmental Solutions, LLC
InventorsStephen Allen Johnson, John Wurster, John Philip Comer
Life of this patent
Estimating the term…
Abstract
The present invention is directed to additives for coal-fired furnaces, particularly furnaces using a layer of slag to capture coal particles for combustion. The additive(s) include iron, mineralizer(s), handling aid(s), flow aid(s), and/or abrasive material(s). The iron and mineralizers can lower the melting temperature of ash in low-iron, high alkali coals, leading to improved furnace performance.
Claims85
A composition, comprising:
- coal particles and
- an additive, comprising:
- an iron-containing compound, wherein the iron is present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower, wherein the additive is in the form of a free-flowing particulate and wherein the iron content of the additive ranges from about 50 about 99 wt. % (dry basis of the additive), and further comprising a mineralizer in an amount of at least about 1 wt. % (dry basis of the additive);
- and
- a fugitive emission inhibitor, wherein the fugitive emission inhibitor is at least one of a grease and oil.
2 more elements
A coal-containing feed material for a furnace, comprising:
- low-sulfur coal;
- and
- an additive, wherein the additive includes:
- iron in an amount at least about 80 wt. % (dry basis of the additive);
- a mineralizer in an amount of at least about 1 wt. % (dry basis of the additive),
- wherein the coal and additive are entrained in an airstream, and wherein the additive includes wustite.
3 more elements
A composition, comprising:
- coal;
- and
- an additive, comprising:
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), and wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower;
- and
- water in a ratio of from about 100 parts dry additive to one part water to about 1000 parts dry additive to one part water.
3 more elements
A composition, comprising:
- coal particles;
- and
- an additive comprising:
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower and wherein the additive is in the form of a free-flowing particulate;
- and
- a fugitive emission inhibitor that is at least one of a grease and oil.
3 more elements
A composition, comprising:
- coal particles;
- and
- an additive comprising:
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower;
- and
- water in a ratio of from about 100 parts dry additive to one part water to about 1000 parts dry additive to one part water.
3 more elements
A composition, comprising:
- coal particles;
- and
- an additive comprising:
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower;
- and
- an adhesive.
3 more elements
A composition, comprising:
- coal particles;
- and
- an additive comprising:
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower and wherein the additive is in the form of a free-flowing particulate;
- and
- a dust suppression agent, wherein the content of the agent in the additive ranges from about 1 to about 10 wt. % (dry basis) of the additive.
3 more elements
A composition, comprising:
- coal particles and
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower, wherein the additive is in the form of a free-flowing particulate, and wherein the iron content ranges from about 50 to about 99 wt. % (dry basis of the additive) amd further comprising a mineralizer in an amount of at least about 1 wt. % (dry basis of the additive) and a fugitive emission inhibitor that is at least one of a grease and oil.
A composition, comprising:
- coal particles and
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower, wherein the iron content ranges from about 50 to about 99 wt. % (dry basis of the additive) and further comprising a mineralizer in an amount of at least about 1 wt. % (dry basis of the additive) adn an adhesive.
A composition, comprising:
- coal particles and
- an iron-containing compound, the iron being present in an amount of at least about 50 wt. % (dry basis of the additive), wherein at least about 33.5% of the iron is in the form of iron having a valence of +2 or lower, and wherein the iron content ranges from about 50 to about 99 wt. % (dry basis of the additive) and further comprising a mineralizer in an amount of at least about 1 wt. % (dry basis of the additive) and a dust suppression agent, wherein the content of the agent in the additive ranges from about 1 to about 10 wt. % (dry basis) of the additive.
A coal-containing feed material for a furnace, comprising:
- low sulfur coal;
- and
- an additive, wherein the additive includes:
- iron in an amount of from about 70 to about 90 wt. % (dry basis of the additive);
- a mineralizer in an amount of at least about 1 wt. % (dry basis of the additive),
- wherein the coal and additive are entrained in an airstream, and wherein the additive includes wustite.
3 more elements
Dependencies are inferred from the claim text.