Thermal power plant with sequential combustion and reduced-CO2 emission, and a method for operating a plant of this type
AssigneeALSTOM Technology Ltd
InventorsDominikus Bücker, Timothy Griffin, Dieter Winkler
Life of this patent
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Abstract
A thermal power plant with sequential combustion and reduced CO2 emissions is disclosed, which includes the following components, which are connected in series via in each case at least one flow passage (S): a combustion feed air compressor unit, a first combustion chamber, a high-pressure turbine stage, a second combustion chamber and a low-pressure turbine stage. The second combustion chamber and/or the low-pressure turbine stage can be supplied with a cooling gas stream for cooling purposes. A method for operating a thermal power plant of this type is also disclosed.
Claims25
A thermal power plant with sequential combustion and reduced CO2 emissions, which includes the following components, which are connected in series via in each case at least one flow passage:
- a combustion feed air compressor unit, a first combustion chamber, a high-pressure turbine stage, a second combustion chamber and a low-pressure turbine stage, it being possible for the second combustion chamber and/or the low-pressure turbine stage to be supplied with a cooling gas stream for cooling purposes,
- wherein there is a recirculation line which feeds at least some of the exhaust-gas stream emerging from the low-pressure turbine stage to a compressor unit,
- wherein there is a cooling line, which feeds at least some of the compressed exhaust-gas stream emerging from the compressor unit to the second combustion chamber and/or the low-pressure turbine stage as a cooling gas stream for cooling purposes, and
- wherein a CO2 separation unit, which separates at least fractions of CO2 out of the cooling gas stream, is provided in the cooling line.
A method for operating a thermal power plant with sequential combustion and reduced CO2 emissions, which includes the following components, connected in series via in each case at least one flow passage:
- a combustion feed air compressor unit, a first combustion chamber, a high-pressure turbine stage, a second combustion chamber and a low-pressure turbine stage, the second combustion chamber and/or the low-pressure turbine stage being supplied with a cooling gas stream for cooling purposes, comprising:
- recirculating at least some of the exhaust gas emerging from the low-pressure turbine stage;
- compressing the recirculated exhaust gas;
- separating CO2 from the compressed exhaust as so as to lower the CO2 concentration of the compressed exhaust gas;
- and
- providing the CO2-depleted exhaust gas stream as a cooling gas stream for cooling purposes.
Dependencies are inferred from the claim text.