Systems, methods, and apparatus are provided for generating power in low emission turbine systems and separating the exhaust into rich CO.sub.2 and lean CO.sub.2 streams. In one or more embodiments, the exhaust is separated at an elevated pressure, such as between a high-pressure expansion stage and a low-pressure expansion stage.

A turbocharger includes a center housing, a turbine connected on one side of the center housing, the turbine including a turbine wheel connected to a shaft, the shaft extending through the center housing, and a compressor connected on an opposite side of the center housing, the compressor including a compressor wheel connected to the shaft opposite the turbine wheel. The shaft includes a cylindrical body having a centerline, a bore extending into the body adjacent the compressor wheel, and a stublet having an internal end engaged in the bore, and an external end connected to the compressor wheel.

A combustor of an embodiment includes: a cylindrical combustor liner; and a fuel nozzle which is provided at one end of the combustor liner and jets a fuel and an oxidant into the combustor liner. The fuel nozzle includes: a plurality of fuel supply passages which each supply the fuel; and a plurality of oxidant supply passages which each supply the oxidant. Flow rates of the fuel supplied to the respective fuel supply passages and flow rates of the oxidant supplied to the respective oxidant supply passages are each individually regulated.

Aspects of the present disclosure relate to steam cycle methods, systems, and apparatus for efficiently reducing carbon footprints in plant systems. In one aspect, a cycle is conducted in a plant system to collect CO.sub.2. In one aspect, a cycle is conducted in a plant system to recycle energy. The plant system includes one or more of a power production system, a refining system, and/or a petrochemical processing system.

Offshore systems and methods may be configured for offshore power generation and carbon dioxide injection for enhanced gas recovery for gas reservoirs. For example, a method may include: providing an offshore facility including a gas turbine, and a gas separator; producing a produced gas from a gas reservoir to the offshore facility; combusting the produced gas in a gas turbine to produce power and a flue gas; at least partially removing nitrogen from the flue gas in a gas separator to produce a carbon dioxide-enriched flue gas and a nitrogen-enriched flue gas; compressing the carbon dioxide-enriched flue gas in a gas compressor to produce a compressed gas; and injecting the compressed gas from the gas compressor into the gas reservoir, wherein 80 mol % or more of hydrocarbon in the produced gas is combusted and/or injected into the gas reservoir.

The invention relates to a method for operating a power plant (1) for generating electrical energy for delivery to at least one consumer (16) by combustion of a carbonaceous combustible, wherein carbon dioxide (19) is separated from the flue gas (7) of the power plant (1), the separated carbon dioxide (19) is converted at least in part into a fuel (20), characterized in that the fuel (20) is combusted at least temporarily in at least one heat engine (4) so as to form a waste gas (8), and electrical energy is generated by the heat engine (4) and is delivered to at least one consumer (16), at least some of the thermal energy of the waste gas (8) being used in at least one of the following processes: a) for heating combustion air (10) of a power plant (1); b) for heating a process medium (14) of the power plant (1); c) in a drying of the combustible of the power plant (1); and d) in carbon dioxide separation.

A system for offshore, direct carbon dioxide sequestration includes an offshore marine platform fixed to the ocean floor above an offshore, subsea storage reservoir. A carbon dioxide floating storage unit moored adjacent the marine platform gathers and stores carbon dioxide delivered in discreet amounts from carbon dioxide sources. Carbon dioxide sources may include carbon dioxide delivery vessels and a carbon dioxide capture system mounted on the marine platform. Once a desired volume of carbon dioxide has been gathered in the carbon dioxide floating storage unit, compressors in fluid communication with the carbon dioxide floating storage unit may be utilized to increase the pressure of the gathered carbon dioxide to a desired injection pressure, after which the pressurized carbon dioxide is pumped directly from the fixed marine platform into the subsea storage reservoir.

The present disclosure relates to systems and methods useful for power production. In particular, a power production cycle utilizing CO.sub.2 as a working fluid may be configured for simultaneous hydrogen production. Beneficially, substantially all carbon arising from combustion in power production and hydrogen production is captured in the form of carbon dioxide. Further, produced hydrogen (optionally mixed with nitrogen received from an air separation unit) can be input as fuel in a gas turbine combined cycle unit for additional power production therein without any atmospheric CO.sub.2 discharge.

The present disclosure relates to systems and methods useful for power production. In particular, a power production cycle utilizing CO.sub.2 as a working fluid may be combined with a second cycle wherein a compressed CO.sub.2 stream from the power production cycle can be heated and expanded to produce additional power and to provide additional heating to the power production cycle.

A system includes a gas turbine system and an aftertreatment system coupled to an exhaust outlet of the gas turbine system and configured to treat exhaust gases exiting the exhaust outlet. The aftertreatment system includes a cooling unit configured to cool the exhaust gases and a carbon dioxide (CO2) treatment unit coupled to the cooling unit and configured to treat cooled exhaust gases by reducing an amount of CO2 in the cooled exhaust gases with lithium hydroxide (LiOH). The aftertreatment system includes a LiOH supply unit coupled to the CO2 treatment unit and configured to feed LiOH into the CO2 treatment unit such that a reaction between LiOH and CO2 occurs inside the CO2 treatment unit to convert CO2 into lithium carbonate (Li2CO3) and water (H2O). The aftertreatment system also includes a treated exhaust outlet coupled to the CO2 treatment unit and configured to discharge treated exhaust gases.