A binary power plant system, comprising: a vaporizer for vaporizing an organic motive fluid circulating in a closed Organic Rankine Cycle (ORC) by a heat source fluid in heat exchange relation therewith and producing wet organic motive fluid vapor having a quality of at least approximately 80 percent; and a single organic vapor, turbine of said ORC: having an inlet for receiving the wet organic motive fluid vapor, wherein organic motive fluid vapor is expanded in said single organic vapor turbine without causing turbine blades of the turbine to be subjected to erosion.

A hybrid powerplant can include a fuel cell cycle system configured to generate a first power using a fuel and an oxidizer. The powerplant can also include a supercritical carbon dioxide (sCO.sub.2) cycle system operatively connected to the fuel cell cycle to receive heat from the fuel cell cycle to cause the sCO.sub.2 cycle system to generate a second power.

A closed-loop Brayton cycle system utilizes supercritical carbon dioxide as the working fluid for the system to achieve higher efficiencies than can be achieved with traditional open-loop gas turbine engines. A bleed channel is used to direct a flow of cooling fluid to cool the turbine blades during operation of the system, preventing damage to the turbine blades during operation of the system. The bleed channel includes a bleed inlet fluidly coupled between a first recuperator and a second recuperator and a bleed outlet fluidly coupled to the turbine blades. The bleed channel is configured to direct the flow of cooling fluid to the turbine blades at a desired temperature and pressure.

The disclosure concerns a waste heat recovery cycle system and related method in which a Brayton cycle system operates in combination with a Rankine cycle system. The Brayton cycle system has a heater configured to circulate a fluid, namely an inert gas, in heat exchange relationship with a heating source, such as an exhaust gas of a different system, in order to recover waste heat from such different system by heating the inert gas. The Rankine cycle system has a heat exchanger configured to circulate a second fluid, in heat exchange relationship with the inert gas of the Brayton cycle system to heat the second fluid while at the same time cooling the inert gas. The second fluid can be selected among fluids having a boiling point at a temperature lower than the temperature of the inert gas from the expansion unit/group in the Brayton cycle system.

The present disclosure relates to methods for starting and rapidly decelerating a turbomachine in a power generation system that utilizes a supercritical fluid in a closed cycle.

A system for using excess energy of a power generation system and an sCO2 (supercritical carbon dioxide) stream to store and generate power. An air separation unit uses the excess energy to cool and liquify ambient air into liquid nitrogen (L-N2) and liquid oxygen (L-O2). The L-O2 and L-N2 are stored until energy is desired. An L-O2 energy discharge path has an oxygen heat exchanger that vaporizes and heats the oxygen, a combustor that combusts the oxygen and fuel to produce exhaust, and a first turbine is driven by the exhaust to produce energy. An L-N2 energy discharge path has a nitrogen heat exchanger that vaporizes and heats the L-N2, thereby providing expanded nitrogen, and a second turbine is driven by the expanded nitrogen to produce energy. Heat for the heat exchangers on both discharge paths is provided by the sCO2 stream.

A power generation assembly and related methods to enhance power efficiency and reduce greenhouse gas emissions associated with a power-dependent operation, may include a gas turbine engine. The power generation assembly also may include a heat exchanger positioned to receive exhaust gas from the gas turbine engine during operation. The heat exchanger may include an exhaust gas inlet positioned to receive exhaust gas and a liquid inlet positioned to receive liquid. The heat exchanger may be positioned to convert liquid into steam via heat from the exhaust gas. The power generation assembly further may include a steam turbine positioned to receive steam from the heat exchanger and convert energy from the steam into mechanical power. The power generation assembly still further may include an electric power generation device connected to the steam turbine and positioned to convert the mechanical power from the steam turbine into electrical power.

Leveraging a turboexpander to provide additional functionality in compressed gas fueled systems is disclosed. The system includes a compressed gas storage device storing a compressed gas at a first pressure. A turboexpander operably coupled with the compressed gas storage device, the turboexpander comprising a turbine coupled with a drive shaft, the turboexpander to maintain the compressed gas below a threshold temperature limit as it controllably expands the compressed gas from the first pressure to the second pressure via an amount of work obtained from a rotation of the turbine and the drive shaft. A compressed gas receiving device to receive the compressed gas at the second pressure from the turboexpander and generate an amount of electrical energy from the compressed gas.

The present invention relates to a high pressure process for Pre-Combustion and Post-Combustion CO.sub.2 capture (HP/MP/LP gasification) from a CO.sub.2 gas stream (CO2-Stream) by way of CO.sub.2 total subcritical condensation (CO2-CC), separation of liquid CO.sub.2, higher pressure elevation of obtained liquid CO.sub.2 via HP pump, superheating of CO.sub.2 up to high temperature for driving of a set of CO.sub.2 expander turbines for additional power generation (CO2-PG), EOR or sequestration (First new Thermodynamic Cycle). The obtained liquid CO.sub.2 above, will be pressurized at a higher pressure and blended with HP water obtaining high concentrated electrolyte, that is fed into HP low temperature electrochemical reactor (HPLTE-Syngas Generator) wherefrom the cathodic syngas and anodic oxygen will be performed. In particular the generated HP oxygen/syngas will be utilized for sequential combustion (“H.sub.2/O.sub.2-torches”) for super-efficient hydrogen based fossil power generation (Second new Thermodynamic Cycle).

Extra heat in a closed cycle power generation system, such as a reversible closed Brayton cycle system, may be dissipated between discharge and charge cycles. An extra cooling heat exchanger may be added on the discharge cycle and disposed between a cold side heat exchanger and a compressor inlet. Additionally or alternatively, a cold thermal storage medium passing through the cold side heat exchanger may be allowed to heat up to a higher temperature during the discharge cycle than is needed on input to the charge cycle and the excess heat then dissipated to the atmosphere.