Power plant and operating method
AssigneeALSTOM Technology Ltd
InventorsDominikus Buecker, Timothy Griffin, Armin Schimkat
Life of this patent
Estimating the term…
Abstract
A method for operating a power plant (2), which includes at least one compressor (3), at least one turbine (4), and a burner arrangement (5), involves, to enhance the power plant (2), feeding a combustion exhaust gas from a pre-burner (8) of the burner arrangement (5) to an oxygen-removal device (11), which removes gas of the oxygen from the combustion exhaust gas in which it is contained.
Claims19
A method for operating a power plant, which power plant includes at least one compressor, at least one turbine, and at least one burner arrangement including at least one pre-burner and at least one afterburner, the method comprising:
- compressing an oxidizer gas containing oxygen gas in the compressor;
- burning the compressed oxidizer gas under lean conditions and with a fuel gas in at least one pre-burner of the burner arrangement;
- feeding a combustion exhaust gas from the pre-burner to an oxygen-removal device which removes part of the oxygen gas from the combustion exhaust gas in which said oxygen gas part is contained;
- burning the combustion exhaust gas with a reduced oxygen content with a fuel gas downstream of the oxygen-removal device in at least one afterburner of the burner arrangement;
- feeding a combustion exhaust gas from the afterburner to the turbine and expanding said combustion exhaust gas from the afterburner in the turbine;
- discharging the oxygen removed from the combustion exhaust gas from the pre-burner from the oxygen-removal device by a sweep gas, wherein the sweep gas is an inert gas or a fuel-free gas;
- providing a steam generating device incorporated in an exhaust gas path of the turbine;
- evaporating a liquid with the aid of a turbine exhaust gas;
- cooling the turbine exhaust gas while evaporating said liquid;
- applying high pressure with the steam generating device to the steam;
- expanding the high-pressure steam in a steam turbine;
- and
- removing partially expanded steam from the steam turbine as medium-pressure steam, and admixing said partially expanded steam to a synthesis gas upstream of the at least one pre-burner, upstream of the at least one afterburner, or upstream of both.
A power plant useful for power generation comprising:
- a compressor configured and arranged for compressing an oxidizer gas containing oxygen gas;
- at least one pre-burner configured and arranged for burning the compressed oxidizer gas with a fuel gas under lean conditions;
- an oxygen-removal device configured and arranged for removing some of the oxygen gas from the combustion exhaust gas from the pre-burner;
- at least one afterburner configured and arranged for burning the combustion exhaust gas with a reduced oxygen content with a fuel gas;
- a turbine configured and arranged for expanding the combustion exhaust gas from the afterburner;
- a sweep gas device configured and arranged for discharging the oxygen removed from the combustion exhaust gas from the pre-burner from the oxygen-removal device with a sweep gas, wherein the sweep gas is an inert gas or a fuel-free gas;
- a turbine exhaust gas path;
- a steam generating device incorporated in the turbine exhaust gas path, configured and arranged to evaporate a liquid with a turbine exhaust gas, the turbine exhaust gas being simultaneously cooled;
- wherein the steam generating device is configured and arranged to apply a high pressure to the steam;
- a steam turbine configured and arranged to expand the high-pressure steam;
- and
- means for removing partially expanded steam from the steam turbine as medium-pressure steam, and for admixing the partially expanded steam to a synthesis gas upstream of the at least one pre-burner, upstream of the at least one afterburner, or upstream of both.
Dependencies are inferred from the claim text.