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US 6,773,471 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
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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.
Claims7
A slag layer in a coal-burning furnace, comprising:
- at least about 5 wt. % (dry basis of the slag Layer) coal;
- iron in an amount of at least about 15 wt. % (dry basis of the slag layer);
- a mineralizer in an amount of at least about 1 wt. % (dry basis of the slag layer);
- at least about 20 wt. % silica oxides (dry basis of the slag layer);
- from about 13 to about 20 wt. % aluminum oxides (dry basis of the slag layer);
- and from about 18 to about 35 wt. % calcium oxides (dry basis of the slag layer).
3 more elements
A solid byproduct of coal combustion, comprising:
- iron in an amount of at least about 15 wt. % (dry basis of the byproduct);
- zinc in an amount of at least about 1 wt. % (dry basis of the byproduct);
- silica compounds in an amount of at least about 2 wt. % (dry basis of the byproduct);
- aluminum compounds in an amount of at least about 20 wt. % (dry basis of the byproduct);
- and
- calcium compounds in an amount of at least about 15 wt. % (dry basis of the byproduct).
3 more elements
Dependencies are inferred from the claim text.