Method of operating a combination power plant by coal or oil gasification
AssigneeABB Management AG
InventorPeter Muller
Life of this patent
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Abstract
In a method for operating a combined cycle power plant with coal or oil gasification, wherein the oxygen required for gasification is supplied by an air separation plant, the air required for the air separation plant is condensed in a first, separate condenser and is cooled in a heat exchanger prior to being supplied to the air separation plant. Only enough nitrogen produced in the separation plant is supplied to the gas turbine combustion chamber as the surge limit of the compressor permits. The remaining portion of the nitrogen is expanded to ambient pressure in an expander after exiting the air separation plant.
Claims11
A method for operating a combined cycle power plant with coal or oil gasification, comprising the steps of:
- compressing air required for an air separation plant in a first compressor;
- cooling the compressed air in a heat exchanger prior to the compressed air being supplied to the air separation plant;
- operating the air separation plant to produce oxygen required for gasification;
- compressing the oxygen in a second compressor;
- supplying the compressed oxygen to gasification reactor;
- compressing a portion of an amount of nitrogen generated in the air separation plant in a third compressor to a pressure level of a gas turbine combustion chamber;
- and
- mixing the compressed nitrogen with synthetic gas produced in the gasification reactor and supplying the mixture to the gas turbine combustion chamber, wherein the portion of nitrogen supplied to the gas turbine combustion chamber is not more than a surge limit of the third compressor permits, and wherein a remaining portion of the nitrogen not compressed and supplied to the gas turbine combustion chamber is expanded to ambient pressure in an expander after it exits the air separation installation.
Dependencies are inferred from the claim text.