Advanced hybrid coal gasification cycle utilizing a recycled working fluid
AssigneeFoster Wheeler Energy Corporation
InventorZhen Fan
Life of this patent
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Abstract
A power generating system having a hybrid gasification cycle, in which CO2 is recycled to a gasifier to be used as a gasification reactant and working fluid. The power generating system includes a source of fresh, pure oxygen, a gasifier, a particle separator arranged in flow connection with the gasifier, a syngas combustor, a gas turbine arranged in flow connection with the syngas combustor, a steam generator arranged in flow connection with the outlet of the gas turbine, and a gas compressor system which discharges a stream of compressed exhaust gas. A first portion of the stream of compressed exhaust gas is conducted to the gasifier to control the temperature in the gasifier, to provide CO2 and steam for gasification, and to decrease the demand for fresh, pure oxygen therein.
Claims21
A power generating system comprising:
- a source of fresh, pure oxygen (O2);
- a gasifier, having a solid fuel inlet and a fresh, pure oxygen inlet, operating at an elevated pressure P1 to convert the solid fuel to syngas, comprising carbon monoxide (CO) and hydrogen (H2), and a solid residue comprising char;
- a particle separator arranged in flow connection with said gasifier for separating the char particles from the syngas emanating from said gasifier;
- a syngas combustor, having a fresh, pure oxygen inlet and an inlet for syngas discharged from the particle separator, for firing the syngas so as to produce exhaust gas comprising carbon dioxide (CO2), water and excess oxygen;
- a gas turbine arranged in flow connection with said syngas combustor, for expanding the exhaust gas so as to generate power with a generator connected to said gas turbine, and discharging expanded exhaust gas through an outlet of said gas turbine;
- a steam generator, arranged in flow connection with said outlet of said gas turbine, comprising an outlet for discharging processed exhaust gas;
- a gas compressor system having an inlet in flow connection with said outlet of said steam generator, and an outlet for discharging a stream of compressed exhaust gas;
- and
- a first conductor that conducts a first portion of the stream of compressed exhaust gas to said gasifier to control the temperature in said gasifier, to provide CO2 and steam for gasification, and to decrease the demand for fresh, pure oxygen therein.
A method of generating power, comprising the steps of:
- (a) supplying fresh, pure oxygen from an oxygen source;
- (b) introducing solid fuel and fresh, pure oxygen to a gasifier and converting the solid fuel to syngas, comprising carbon monoxide (CO) and hydrogen (H2), and a solid residue comprising char;
- (c) conducting syngas emanating from the gasifier to a particle separator, and separating char particles from the syngas in the particle separator;
- (d) firing syngas discharged from the particle separator with fresh, pure oxygen in a syngas combustor, and producing exhaust gas comprising carbon dioxide (CO2), water and excess oxygen;
- (e) expanding the exhaust gas in a gas turbine arranged in flow connection to the syngas combustor, generating power with a generator connected to the gas turbine, and discharging expanded exhaust gas through an outlet of the gas turbine;
- (f) conducting expanded exhaust gas from the gas turbine to a steam generator and discharging processed exhaust gas through an outlet of the steam generator;
- (g) introducing processed exhaust gas from the steam generator to an inlet of a gas compressor system, and producing a stream of compressed exhaust gas in the gas compressor system;
- and
- (h) conducting a first portion of the stream of compressed exhaust gas to the gasifier to control the temperature in the gasifier, to provide CO2 and steam for gasification, and to decrease the demand for fresh, pure oxygen therein.
Dependencies are inferred from the claim text.