Coal/coke/heavy residual oil boiler with sulfur and carbon dioxide capture and recovery
AssigneePlasma Energy Technologies Inc.
InventorsDonald A. Rudberg, Richard P. Schuller, Donald W. Cott
Life of this patent
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Abstract
A pulverized coal/coke (PC) boiler combusts carbon-based fuel with substantially pure oxygen and a flue gas recirculation stream (containing predominately carbon dioxide) at varied ratios to achieve a desired boiler temperature profile while producing captured sulfur, a high purity captured CO2 and electric power. The boiler includes at least one of (a) a mechanism for admixing a pulverized solid carbon-based fuel with an alkali metal salt and (b) injecting alkali metal salt into the boiler combustion zone containing a pulverized solid carbon-based fuel.
Claims18
A method of operating a coal/coke/heavy residual oil steam boiler to produce an exiting carbonaceous flue gas containing predominantly carbon dioxide with low nitrogen oxide, sulfur oxide and water concentrations, the method comprising:
- (a) admixing a carbon-based fuel with an alkali metal compound;
- (b) combusting the carbon-based fuel with a 95-100 percent pure oxygen stream and a flue gas recirculation stream, the recirculation stream containing predominately carbon dioxide;
- and
- (c) varying the mass flow ratios of the oxygen and recirculation streams such that a desired boiler temperature profile, a reduction in sulfur oxide concentration in said exiting carbonaceous flue gas to a concentration of less than 50 parts per million and a reduction in nitrogen oxide concentration in said exiting carbonaceous flue gas to a concentration of less than 100 parts per million is achieved.
A method of operating a coal/coke/heavy residual oil steam boiler to produce an exiting carbonaceous flue gas containing predominantly carbon dioxide with low nitrogen oxide, sulfur oxide and water concentrations, the method comprising:
- (a) combusting a carbon-based fuel with a 95-100 percent pure oxygen stream from an air separation unit and a flue gas recirculation stream in a combustion zone, the recirculation stream containing predominately carbon dioxide;
- (b) introducing an alkali metal salt into the combustion zone containing the carbon-based fuel;
- and
- (c) varying the mass flow ratios of the oxygen and recirculation streams such that a desired boiler temperature profile, a reduction in sulfur oxide concentration in said exiting carbonaceous flue gas to a concentration of less than 50 parts per million and a reduction in nitrogen oxide concentration in said exiting carbonaceous flue gas to a concentration of less than 100 parts per million is achieved.
Dependencies are inferred from the claim text.