Abstract: A system may include an exhaust conduit configured to route an exhaust gas from an engine to a heat recovery steam generator (HRSG). The system may also include a coolant supply coupled to the exhaust conduit. The coolant supply is configured to supply a coolant to the exhaust conduit. Additionally, the system may include a controller configured to control the coolant supply to control an exhaust temperature of the exhaust gas flowing through the exhaust conduit from the engine to the HRSG, or a steam temperature of steam generated by the HRSG, or a combination thereof. The controller may be configured to control the coolant supply differently in a full load condition relative to a part load condition of the system.

Abstract: Embodiments of the present disclosure relate to cooling a gas turbine which operates at varying loads. An apparatus according to embodiments of the present disclosure may include: an outlet heat exchanger positioned within a transition duct of a turbine outlet of a gas turbine, wherein the transition duct is positioned upstream from a heat recovery steam generator (HRSG); an extraction line fluidly connecting the outlet heat exchanger to the HRSG, such that a heat exchange fluid flows from the HRSG to the outlet heat exchanger through the extraction line; and a return line fluidly connecting the outlet heat exchanger to the HRSG, such that the heat exchange fluid returns to the HRSG through the return line after passing through the outlet heat exchanger.

Abstract: A system for warming up a steam turbine includes a gas turbine and a controller operably connected to the gas turbine. The controller is programmed to receive a plurality of measured input signals and control the gas turbine to produce an exhaust having a desired energy. A first measured input signal is reflective of a measured operating parameter of the gas turbine and a second measured input signal is reflective of an operating parameter of the steam turbine. A method for warming up a steam turbine includes sending a plurality of measured input signals to a controller, wherein a first measured input signal reflects a measured operating parameter of a gas turbine and a second measured input signal reflects an operating parameter of the steam turbine. The method further includes controlling the gas turbine based on the plurality of measured input signals and producing an exhaust from the gas turbine, wherein the exhaust has a desired energy.

Abstract: A system may include an exhaust conduit configured to route an exhaust gas from an engine to a heat recovery steam generator (HRSG). The system may also include a coolant supply coupled to the exhaust conduit. The coolant supply is configured to supply a coolant to the exhaust conduit. Additionally, the system may include a controller configured to control the coolant supply to control an exhaust temperature of the exhaust gas flowing through the exhaust conduit from the engine to the HRSG, or a steam temperature of steam generated by the HRSG, or a combination thereof. The controller may be configured to control the coolant supply differently in a full load condition relative to a part load condition of the system.

Abstract: A system and method in a combined cycle power plant includes a processor modeling plant level performance by considering the interrelation between outputs of the gas turbine and the steam turbine. The model can be computational, predictive, or both. The model may be used to control subsystems of the plant (including the gas turbine and the steam turbine) to achieve a target plant performance. The model may also be used to diagnose or maintain subsystems of the combined cycle power plant.

Abstract: Systems and methods for improved control of a turbomachine system with a bottoming cycle system are presented. The systems and methods include a controller that utilizes modeling techniques to derive a plurality of load path curves. The controller utilizes a current load path, a minimum load path, and a constant efficiency load path. The systems and methods include a control process configured to receive a user input representative of a life cycle control modality and to execute a control action based on deriving a load efficiency by applying the current load path, the minimum load path, the constant efficiency load path, or a combination thereof, and the life cycle control modality. The control action is applied to control the turbomachine system and the bottoming cycle system fluidly coupled to the turbomachine system. Further, the life cycle control modalities may be selected by a user based upon known tradeoffs.

Abstract: Systems and methods for improved control of a turbomachine system with a bottoming cycle system are presented. The systems and methods include a controller that utilizes modeling techniques to derive a plurality of load path curves. The controller utilizes a current load path, a minimum load path, and a constant efficiency load path. The systems and methods include a control process configured to receive a user input representative of a life cycle control modality and to execute a control action based on deriving a load efficiency by applying the current load path, the minimum load path, the constant efficiency load path, or a combination thereof, and the life cycle control modality. The control action is applied to control the turbomachine system and the bottoming cycle system fluidly coupled to the turbomachine system. Further, the life cycle control modalities may be selected by a user based upon known tradeoffs.

Abstract: An integrated turbomachine plant is provided and includes a combustor a turbomachine operably connected to the combustor and including a compressor and a turbine expander, a pathway to flow compressed air from the compressor through the turbine expander to heat the compressed air, an additional pathway by which high temperature fluids output from the turbomachine are employed to heat the compressed air and an air separation unit operably connected to the pathway and configured to separate the heated compressed air into oxygen and oxygen-depleted air.

Abstract: A bottoming cycle modeling system for a combined cycle power plant includes one or more measurement devices configured and disposed to measure energy of exhaust gases passing from a gas turbine portion, one or more measurement devices configured and disposed to measure at least one bottoming cycle parameter of the combined cycle power plant, and a modeling system configured and disposed to calculate bottoming cycle performance based on the at least one output parameter of the gas turbine portion and the at least one bottoming cycle parameter. The modeling system employs a model that provides a substantially fully robust solution in approximately real time.

Abstract: A system and method in a combined cycle power plant includes a processor modeling plant level performance by considering the interrelation between outputs of the gas turbine and the steam turbine. The model can be computational, predictive, or both. The model may be used to control subsystems of the plant (including the gas turbine and the steam turbine) to achieve a target plant performance. The model may also be used to diagnose or maintain subsystems of the combined cycle power plant.

Abstract: Combined cycle efficiency can be improved by heating fuel in a gas turbine fuel line in two stages using (i) hot water from an HP economizer of a heat recovery steam generator (HRSG) in a second stage and (ii) hot water from an IP economizer of the HRSG and water output flow from the second stage in a first stage. Efficiency may be further improved by adding one or more fuel preheaters using hot water from the IP feedpump and sequential injections of hot water into the fuel.

Abstract: An integrated turbomachine plant is provided and includes a combustor a turbomachine operably connected to the combustor and including a compressor and a turbine expander, a pathway to flow compressed air from the compressor through the turbine expander to heat the compressed air, an additional pathway by which high temperature fluids output from the turbomachine are employed to heat the compressed air and an air separation unit operably connected to the pathway and configured to separate the heated compressed air into oxygen and oxygen-depleted air.

Abstract: A method of assembling a steam turbine power system with a coolant source is provided. The method includes providing a first steam turbine train including a first high pressure turbine assembly, a first low pressure turbine assembly coupled in flow communication with the first high pressure turbine assembly, and a first condenser coupled in flow communication with the first low pressure turbine assembly. The method also includes providing a second steam turbine train including a second high pressure turbine assembly, a second low pressure turbine assembly coupled in flow communication with the second high pressure turbine assembly, and a second condenser coupled in flow communication with the second low pressure turbine assembly.

Abstract: A method of assembling a steam turbine power system with a coolant source is provided. The method includes providing a first steam turbine train including a first high pressure turbine assembly, a first low pressure turbine assembly coupled in flow communication with the first high pressure turbine assembly, and a first condenser coupled in flow communication with the first low pressure turbine assembly. The method also includes providing a second steam turbine train including a second high pressure turbine assembly, a second low pressure turbine assembly coupled in flow communication with the second high pressure turbine assembly, and a second condenser coupled in flow communication with the second low pressure turbine assembly.