Abstract: A mini combined cycle power plant with a mini gas turbine engine that operates at around 20,000 to 30,000 rpm and is connected to an electric generator through a speed reduction gear box, a low pressure steam turbine connected directly to the gas turbine engine, a high pressure steam turbine connected to the low pressure steam turbine through a smaller gear box so that the high pressure steam turbine can operate at around 70,000 to 100,000 rpm, and a heat recovery steam generator to use the turbine exhaust to produce high pressure steam for the two steam turbines. Leftover heat from the HRSG is used to heat homes or buildings in the local area to the power plant to improve the overall efficiency of the plant.

Abstract: A sealing device for a turbine has a sealing member provided in a gap between a rotor and a stator arranged to surround the rotor, and a fluid path provided within the stator, to introduce, into the stator, a cooling medium used to cool stationary blades extending radially inward from the stator, and to flow the cooling medium at least to an upstream side of the sealing member.

Abstract: Thermodynamic cycles with diluent that produce mechanical power, electrical power, and/or fluid streams for heating and/or cooling are described. Systems contain a combustion system producing an energetic fluid by combusting fuel with oxidant. Thermal diluent is preferably used in the cycle to improve performance, including one or more of power, efficiency, economics, emissions, dynamic and off-peak load performance, temperature regulation, and/or cooling heated components. Cycles include a heat recovery system and preferably recover and recycle thermal diluent from expanded energetic fluid to improve cycle thermodynamic efficiency and reduce energy conversion costs. Cycles preferably include controls for temperatures, pressures, and flow rates within a combined heat and power (CHP) system, and controls for power, thermal output, efficiency, and/or emissions.

Abstract: A system includes a radiation detector array configured to direct a field of view toward multiple conduits within a fluid flow path from a turbine into a heat exchanger. The radiation detector array is configured to output a signal indicative of a multi-dimensional temperature profile of the fluid flow path based on thermal radiation emitted by the conduits. The system also includes a controller communicatively coupled to the radiation detector array. The controller is configured to determine a temperature variation across the fluid flow path based on the signal, and to compare the temperature variation to a threshold value.

Abstract: A gasification power generation system provided with a carbon dioxide separation and recovery device is disclosed. The system includes a carbon dioxide separation and recovery device having a shift reactor to convert carbon monoxide contained in fuel gas into carbon dioxide by mixing steam into the fuel gas containing carbon monoxide and hydrogen to cause a shift reaction; a carbon dioxide absorption tower to produce fuel gas from which carbon dioxide has been removed by allowing an absorption liquid to absorb carbon dioxide from the fuel gas containing carbon dioxide flowing down the shift reactor; an absorption liquid recycling device to recycle an absorption liquid by separating carbon dioxide absorbed by the absorption liquid in the carbon dioxide absorption tower; and a gasification power generation system.

Abstract: A method to start up and manage a combined cycle thermal plant for energy production comprising the execution according to a set sequence of a plurality of functional groups.

Abstract: An integrated coal gasification combined cycle facility is provided that can prevent a reduction in power generation efficiency even when low-grade coal having a relatively-high moisture content is used. Included are: a gasification section that gasifies supplied coal; a gas power generation section that generates power by using gas supplied from the gasification section; a steam power generation section that generates power by using the heat of exhaust gas discharged from the gas power generation section; and a coal drying unit that dries the coal by using exhaust heat discharged from the steam power generation section and that supplies the dried coal to the gasification section.

Abstract: A combined cycle power plant with a gas and steam turbine system arranged on a single shaft and integrated with a cogeneration plant having a heat consumer such as a district heating system or industrial plant, including one or more steam extractions at an intermediate-pressure steam turbine that are arranged at the upper casing half-shell of the turbine and extraction steam lines that lead the extracted steam to heat exchangers of the cogeneration plant. The steam extraction outlets are arranged either singly at or near the uppermost point of the casing or in pairs to either side of the uppermost point of the casing. The specific arrangement of the extractions allows a floor-mounting of the single-shaft combined cycle power plant and as such a cost and space efficient realization of the power plant.

Abstract: Provided in one embodiment is a two-shaft gas turbine that exhibits improved reliability, output power, and efficiency. The turbine operates stably by establishing a balance between the driving force of a compressor and the output power of a high-pressure turbine in the case where the two-shaft gas turbine is applied to a system, in which the flow rate of a fluid flowing into a combustor is higher than a simple cycle gas turbine. A portion of the fluid driving the high-pressure turbine is allowed to flow not into the high-pressure turbine but into a low-pressure turbine.

Abstract: A double turbine exhaust duct design and an inline V turbine exhaust duct design that both eliminate the need for the standard T-piece in a turbine exhaust duct assembly, substantially reducing the steam-side pressure drop, minimizing the sub-cooling in the steam cycle (the temperature difference between ACC condensate temperature out and turbine steam temperature), thus improving the overall efficiency of the steam cycle plant heat rate.

Abstract: A power plant (1) that includes at least one of a gas turbine (GT), a steam turbine (ST) with a water-steam cycle, and a heat recovery steam generator (B) operatively connected to a heat generating member such as solar energy system (Ssolar) by means of a primary circuit (10a, 10b, 10c) and a secondary circuit system (20a). The primary heat transfer circuit (10a, 10b) includes solar heating system (Ssolar) configured to heat a primary fluid (10), and the secondary circuit (20a) comprises a flow line (20A) for a secondary flow (20) and a main heat exchanger (23) to exchange heat between the secondary water flow and a gas turbine inlet air flow (2). A first line (10B) in the primary circuit (10b) leads to a first heat exchanger (12) to heat the water flow in the secondary circuit (20a).

Abstract: An apparatus for supplying water to a misting system for an inlet of a gas turbine, includes a diversion of heated feedwater from a loop and to a pump, the pump providing high-pressure feedwater to the misting system. A combined cycle power plant is provided.

Abstract: A combined cycle power plant may include a gas turbine comprising a feed forward signal generator and configured to operate in one of one or more firing modes and generate exhaust gas and a heat recovery steam generator configured to receive the exhaust gas and extract thermal energy from the exhaust gas to generate steam. The feed forward signal generator may be configured to generate a feed forward signal that is used to control the temperature of the steam generated by the heat recovery steam generator.

Abstract: Methods and systems for the generation of electrical energy through the combination of steam flows produced from different fuel sources. Steam produced from processing of a biomass fuel source is combined with steam produced from the processing of natural gas or fossil fuel and routed through a steam turbine generator to produce electrical energy. The steam is preferably reheated after partial processing in the steam turbine generator and then recirculated for further processing in the steam turbine generators. Following extraction of all available energy from the steam, the condensed wet vapor is reheated and used for processing of both energy sources.

Abstract: A combined cycle power plant includes a CO2 capture system operatively integrated with a liquefied natural gas LNG regasification system, where cold energy from the regasification process is used for cooling processes within the CO2 capture system or processes associated with it. These cooling systems include systems for cooling lean or rich absorption solutions for the CO2 capture or the cooling of flue gas. The LNG regasification system is arranged in one or more heat exchange stages having and one or more cold storage units. The power plant with CO2 capture can be operated at improved overall efficiencies.

Abstract: Production of concentrated CO2 and electricity from a hydrocarbon feedstock by introducing an air feed stream and a methane fuel feed stream to an autothermal reactor (ATR) to produce synthesis gas, withdrawing a synthesis gas stream from the ATR and heat exchanging with a water stream to produce steam and heat exchanging the synthesis gas stream with a process stream to produce superheated steam. If necessary, steam is introduced to the synthesis gas stream before passing to a shift converter where synthesis gas reacts with steam to generate additional CO2 and H2. A shift converted gas stream is withdrawn from the shift converter and heat exchanged with a process stream to produce superheated steam. The shift converted gas stream is passed to a CO2 separation unit to separate a concentrated CO2 stream from a H2 stream, and the H2 stream is combusted in a gas turbine to produce electricity.

Abstract: A system configured to decrease the emissions of a power plant system during transient state operation is disclosed. In one embodiment, a system includes: at least one computing device adapted to adjust a temperature of an operational steam in a power generation system by performing actions comprising: obtaining operational data about components of a steam turbine in the power generation system, the operational data including at least one of: a temperature of the components and a set of current ambient conditions at the power generation system; determining an allowable operational steam temperature range for the steam turbine based upon the operational data; generating emissions predictions for a set of temperatures within the allowable steam temperature range; and adjusting the temperature of the operational steam based upon the emissions predictions.

Abstract: The present invention provides a system and method of operating a combined-cycle powerplant at part-load without shutting down an HRSG and steam turbine. The present invention may apply to a powerplant operating in an open-cycle mode. The present invention may also apply to a powerplant operating in a closed-cycle mode.

Abstract: A chemical-looping combustion system is provided in which an oxygen carrier, for example a metallic oxide or peroxide, is used for fuel combustion and produces carbon dioxide and water as by-products. The system delivers steam and CO2 at for direct utilization by steam cycle power generation equipment and heat exchangers. After fuel combustion, the oxygen-poor carrier is regenerated by exposure to air in a second, sequestered reactor. Choice of oxygen-carrier material and conditions allows for the fuel oxidizer reactor to run at temperatures greater than the running temperature of the regenerator reactor.

Abstract: Disclosed herein is a system comprising an air reactor; where the air reactor is operative to oxidize metal oxide particles with oxygen from air to form oxidized metal oxide particles; a fuel reactor; where the fuel reactor is operative to release the oxygen from the oxidized metal oxide particles and to react this oxygen with fuel and steam to form syngas; a water gas shift reactor located downstream of the fuel reactor; where the water gas shift reactor is operative to convert syngas to a mixture of carbon and hydrogen; a combustor; and a gas turbine; the combustor being operative to combust the hydrogen and discharge flue gases derived from the combustion of hydrogen to drive the turbine; where the exhaust from the turbine is carbon free.

Abstract: A power generation system (11) and method of operating such a system (11) including a steam turbine (14). In one embodiment a HRSG (20) includes an evaporator (127) coupled to receive condensate from the steam turbine (14), and a superheater (132) coupled to receive output from the evaporator (127). The HRSG (20) generates steam with thermal energy received from a combustion turbine (28). A flash tank (9) receives water heated in the HRSG (20), outputs a first portion of the water as steam, and outputs a second portion of the water as liquid. A flow line (134) passes steam (51) from the flash tank (9) to a combustion chamber (26) in the combustion turbine (28) to provide power augmentation.

Abstract: A combined power plant that is capable of reducing the time required for restarting is provided.

Abstract: A combined cycle power plant system and methods of operation so as to minimize consumption of cooling water utilizes exhaust from a combustion turbine to generate steam for power generation in a steam turbine topping cycle. The exhaust steam from the steam turbine topping cycle is utilized to vaporize an organic working fluid in an organic working fluid bottoming cycle, where vaporized organic working fluid expanded across a turbine generates additional power. Exhaust gas from the organic working fluid bottoming cycle is condensed utilizing an air-cooled heat exchanger. Heat exchange bundles of the air-cooled heat exchanger are preferably arranged horizontally relative to the ground to maximize efficiency. Turbine inlet cooling is employed at the combustion turbine to recapture energy lost in the system. A thermal energy storage tank may be utilized in conjunction with the turbine inlet cooling to supply chilling water to the system.

Abstract: A solar thermal installation and method for operating a solar thermal installation includes a solar collector arrangement which defines a solar collector fluid passage so that a first heat quantity can be supplied to a fluid, and which has a first fluid infeed connection and a first fluid output connection. A heat exchanger fluid passage permits a second heat quantity to be supplied to a fluid. A heating fluid receiving device is fluidically connected with a first fluid output connection and fluidically connects a second fluid output connection to the first fluid output connection by bypassing the solar collector fluid passage. A consumer device is connected to the heating fluid receiving device. At least a portion of the first heat quantity and second heat quantity can be supplied to the consumer device. A control device controls an operation of the gas turbine depending on the first heat quantity.

Abstract: A method of producing substitute natural gas (SNG) includes providing at least one steam turbine engine. The method also includes providing a gasification system that includes at least one gas shift reactor configured to receive a boiler feedwater stream and a synthesis gas (syngas) stream. The at least one gas shift reactor is further configured to produce a high pressure steam stream. The method further includes producing a steam stream within the at least one gas shift reactor and channeling at least a portion of the steam stream to the at least one steam turbine engine.

Abstract: A combined cycle power plant startup system is provided. The system includes a steam turbine, a HRSG, a condenser, and a bypass system. The steam turbine may include a turbine section. The HRSG may be operably connected to the steam turbine for providing steam to the steam turbine. The HRSG may include a reheater. The bypass system may be configured to adjust the steam pressure downstream of the reheater by routing steam downstream of the reheater to the condenser. The bypass system may include at least one bypass line, at least one control valve operably connected to the at least one bypass line, a pressure gauge configured to monitor the steam pressure downstream of the reheater, and a controller configured to communicate with the pressure gauge and operate the at least one control valve.

Abstract: An energy generation system and method are presented for use in operating a heat engine. The energy generation method comprises: reducing a CO2 gas into CO and O2 gases; reacting said CO and O2 gases, thus combusting the CO gas, and yielding a substantially pure CO2 outlet gas; and supplying said CO2 outlet gas to the heat engine as a working gas in its heat-to-work generation process.

Abstract: An air compressor is driven by a steam engine that generates power using steam. The steam is supplied to the steam engine through a steam supply path, and the steam is exhausted through a steam exhaust path. The steam from the steam engine is supplied to a steam using device through a steam header. The usage load of the steam is monitored by a pressure sensor arranged in the steam header. The compressed air from the air compressor is supplied to a compressed air using device through a compressed air path. The usage load of the compressed air is monitored by a pressure sensor arranged on the compressed air path. The steam supply to the steam engine is controlled based on the usage load of the steam and the usage load of the compressed air.

Abstract: A method involves operating a combined-cycle power plant (10), which has a gas turbine (11) with a compressor (12) and a turbine (13), a heat recovery steam generator (17) which is connected downstream to the gas turbine (11) and is for producing steam in a water/steam cycle, and also at least one once-through cooler (21), through which flows compressed air which is compressed in the compressor (12) and intended for cooling the gas turbine (11), and, cooling down, converts feed-water (24) which is fed from the heat recovery steam generator (17) into steam, and discharges the steam to the heat recovery steam generator (17). The combined-cycle power plant is switched between a first operating mode, in which only the gas turbine cycle is used for power generation, and a second operating mode, in which the gas turbine cycle and the water/steam cycle are used for power generation.

Abstract: A system, in one embodiment, includes an air injection system comprising a plurality of air injection tubes having a staggered arrangement, wherein each of the plurality of air injection tubes is configured to inject air into an exhaust duct.

Abstract: A power generation plant comprises a plant control device (600) including two switchable control modes, i.e., a gas-turbine load control mode (7a) and a steam-turbine load control mode (7b). When the control is performed with the gas-turbine load control mode (7a), a fuel valve (104a) is controlled based on a load of a whole generator set (100), and a steam regulating valve (203a) is controlled based on an exhaust pressure of a steam turbine (202a). When the control is performed with the steam-turbine load control mode (7b), the fuel valve (104a) is controlled such that a valve opening degree thereof is maintained constant, and the steam regulating valve (203a) is controlled based on a load of the whole generator set (100).

Abstract: A steam turbine plant has a steam turbine and an inlet steam collection line with an inlet steam collection line segment is provided. The inlet steam collection line supplies a steam consumer and is introduced into outlet steam flow of the steam turbine at an inlet steam introduction point of the inlet steam collection line segment. A supply steam device has a switching armature for connecting the supply steam device to the inlet steam collection line segment upstream of the inlet steam introduction point. The armature is triggered and switched such that if outlet steam pressure in the inlet steam collection line segment is lower than target pressure, the inlet steam collection line segment is connected to the supply steam device for conducting steam and disconnected between the armature and the inlet steam introduction point, otherwise the supply steam device is separated from the inlet steam collection line segment.

Abstract: A waste heat recovery system is provided. The waste heat recovery system includes a gas separation apparatus that includes a chamber and at least one membrane positioned within the chamber. The gas separation apparatus is configured to produce a retentate that includes at least a combustible gas and a permeate that includes at least a waste gas, wherein the waste gas includes at least a noncombustible gas. Moreover, the waste heat recovery system includes a burner that is coupled to the gas separation apparatus, wherein the burner is configured to receive the permeate and to combust the permeate such that heat is generated from the permeate. Further, a heat recovery steam generator is coupled to the burner and configured to recover heat generated by the burner.

Abstract: Systems and methods for improving the efficiency of a power generation facility utilize heat energy to preheat inlet-air that is supplied to the compressor of a turbine or to preheat fuel that is burned in the turbine. The heat energy used to preheat the inlet-air can be drawn from a heat recovery steam generator (HRSG) that produces steam using at least part of the exhaust gas of the turbine. The heat energy can be obtained from one or more predetermined points within the HRSG, such as a feed water line exiting a drum of the HRSG or a feed line connecting an economizer of the HRSG to a drum of the HRSG. The fluid drawn from the predetermined point passes through a heat exchanger or a preheater to remove the heat energy used for preheating. The fluid is then returned to the HRSG immediately downstream from the point from which it was drawn.

Abstract: A steam injection assembly for a combined cycle system includes a heat recovery system having at least one superheater configured to generate a steam supply. Also included is a gas turbine system having an inlet and a compressor, wherein the inlet receives an air supply and the steam supply for combined injection into the compressor.

Abstract: A steam generator for the generation of steam from recovered heat from the flue gases of the gas cycle of a combined cycle gas turbine power plant comprising at least one high pressure drum; at least one intermediate pressure drum; at least one low pressure drum; steam outlet means to enable extraction of auxiliary process steam from a location downstream of at least one drum. A combined cycle gas turbine power plant including the above.

Abstract: Disclosed is a solar assisted combined cycle power plant having a compressor that pressurizes combustion air, a combustor that mixes and burns the combustion air and gas turbine fuel to generate a high-temperature combustion gas, a gas turbine that drives the compressor by using the combustion gas, an exhaust heat recovery steam generator that obtains steam from thermal energy of a gas exhausted from the gas turbine, and a steam turbine that is driven by using the steam obtained by the exhaust heat recovery steam generator. The solar assisted combined cycle power plant includes a solar collector to turn supplied water to warm water; a heat accumulator that stores pressurized hot water from the solar collector and the exhaust heat recovery steam generator; and a spray device that handles the pressurized hot water as spray water and sprays the spray water onto the air to be taken into the compressor.

Abstract: A method of operating an integrated gasification combined cycle power generation system is provided. The method includes compressing air in an adiabatic air compressor to produce a compressed heated air stream, heating a nitrogen stream using the compressed heated air stream to produce a heated nitrogen stream and a cooled compressed air stream, and channeling the cooled compressed air stream to an air separation unit.

Abstract: The present invention provides an exhaust gas waste heat recovery heat exchanger including a housing having a working fluid inlet, a working fluid outlet, an exhaust inlet, and an exhaust outlet, an exhaust flow path extending through the housing between the exhaust inlet and the exhaust outlet, and a working fluid flow path extending through the housing between the working fluid inlet and the working fluid outlet and having a first portion and a second portion. A flow of working fluid along the first portion of the working fluid flow path can be substantially counter to a flow of exhaust along the exhaust flow path, and the flow of working fluid along the second portion of the working fluid flow path can be substantially parallel to the flow of exhaust along the exhaust flow path.

Abstract: A method of operating a gas turbine power plant including an auxiliary power output for reducing power plant emissions. A heat recovery steam generator receives an expanded working medium from a gas turbine and removes heat from the expanded working medium to form a reduced temperature exhaust gas and to generate steam from the heat removed from the expanded working medium. A steam turbine and generator assembly operates on the steam to produce an auxiliary plant output. A selective catalytic reduction (SCR) system is provided for receiving the reduced temperature exhaust gas; and an auxiliary fan is powered by the auxiliary plant output to supply dilution air for further reducing the temperature of the exhaust gas to prior to passing the exhaust gas through the SCR system.

Abstract: The present application provides a liquid fuel heating system for heating a flow of fuel for a gas turbine engine. The liquid fuel system may include a flow of steam, an ejector/eductor in communication with the flow of fuel and the flow of steam for mixing therewith, and a high pressure pump downstream of the ejector/eductor.

Abstract: A system configured to thermally regulate exhaust portions of a power plant system (e.g. steam turbine) is disclosed. In one embodiment, a system includes: a condenser adapted to connect to and thermally regulate exhaust portions of a steam turbine; and a cooling system operably connected to the condenser and adapted to supply a cooling fluid to the condenser, the cooling system including a solar absorption chiller adapted to adjust a temperature of the cooling fluid.

Abstract: A supercritical heat recovery steam generator includes a duct defining an interior area and having a gas inlet and a gas outlet. The duct is configured to convey gas from the gas inlet to the gas outlet. A portion of the duct between the gas inlet and the gas outlet defines an exhaust gas flow segment of the interior area. A supercritical evaporator is disposed in the interior area and a reheater is disposed in the interior area. The reheater and the supercritical evaporator are disposed in the exhaust gas flow segment, adjacent to each other with respect to the flow of the exhaust gas.

Abstract: A working fluid sensor system adapted to analyze operation of a power generation system is disclosed. In one embodiment, a working fluid sensor system includes: a set of sensors adapted to be disposed within a turbine, the set of sensors including probe portions which extend into a flowpath of the turbine for exposure to a working fluid, the probe portions adapted to react to a force exerted by the working fluid on the probe portions and indicate a moisture content of the working fluid.

Abstract: A method for regulating a short-term power increase of a steam turbine with an upstream waste-heat steam generator is provided. The steam turbine has a number of economizer, evaporator and super heater heating surfaces forming a flow path for a flow medium. The flow medium is tapped off from the flow path in a pressure stage and is injected into the flow path on the flow-medium side between two super heater heating surfaces of the respective pressure stage. Amount of flow medium injected is regulated with a characteristic value which is a discrepancy between the outlet temperature of the final super heater heating surface and a predetermined temperature nominal value. The temperature nominal value is reduced and the characteristic value is temporarily increased more than in proportion to the discrepancy for a time period of the reduction for achieving a short-term power increase of the steam turbine.

Abstract: In a method for operating a combined cycle power plant (10), which has a gas turbine installation (11) and a water-steam cycle (21) connected to the gas turbine installation (11) by a waste heat steam generator (24) and has at least one steam turbine (23), the gas turbine installation (11) includes a compressor (13), a combustion chamber (14), and a turbine (16). To cool the turbine (16), air compressed at the compressor (13) is removed, cooled in at least one cooler (18, 19) flowed through by water, thus generating steam, and introduced into the turbine (16). At least with the gas turbine installation (11) running, prior to or during the start-up of the water-steam cycle (21), waste heat, which is contained in the steam generated in the at least one cooler (18, 19), is used to good effect for pre-heating the installation inside the combined cycle power plant (10).

Abstract: A heating medium supply system is provided which is capable of sufficiently suppressing a temperature fluctuation of a heating medium, by the time when a heat exchanging device recovers heat of the heating medium, by leveling the temperature fluctuation fluctuating inevitably with time. The heating medium supply system includes: a heat collecting unit configured to heat a liquid heating medium by sunlight; a heat exchanging device configured to heat water supplied thereto by means of the heating medium supplied thereto from the heat collecting unit; heating medium supply piping for supplying the heating medium from the heat collecting unit to the heat exchanging device; and a heating medium heater for heating the heating medium and a temperature measuring device configured to measure a temperature of the heating medium, which are provided on the heating medium supply piping.

Abstract: Provided are more efficient techniques for operating gas turbine systems. In one embodiment a gas turbine system comprises an oxidant system, a fuel system, a control system, and a number of combustors adapted to receive and combust an oxidant from the oxidant system and a fuel from the fuel system to produce an exhaust gas. The gas turbine system also includes a number of oxidant-flow adjustment devices, each of which are operatively associated with one of the combustors, wherein an oxidant-flow adjustment device is configured to independently regulate an oxidant flow rate into the associated combustor. An exhaust sensor is in communication with the control system. The exhaust sensor is adapted to measure at least one parameter of the exhaust gas, and the control system is configured to independently adjust each of the oxidant-flow adjustment devices based, at least in part, on the parameter measured by the exhaust sensor.

Abstract: A gas turbine power plant and a method for operating a gas turbine power plant are provided. The power plant includes a gas turbine installation which may supply a mains supply network with electric power and includes a compressor and an associated first gas turbine. Differing from previous gas turbine installations, the compressor of the gas turbine installation and the first gas turbine of the gas turbine installation are decoupled from each other. A second turbine is provided which drives compressor. As a result, the compressor of the gas turbine installation is operated independently of the first gas turbine. Influences on the mains supply network side, such as generating deficiencies in the main supply network, which act upon the first gas turbine as a result of speed reduction, are also not able to have an impact upon the compressor which is decoupled from the first gas turbine.

Abstract: A twin-shaft gas turbine can be used for 50 and 60 Hz power generation without using a reducer. A gas generator includes a compressor that generates compressed air, a burner that burns a fuel mixed with the compressed air received from the compressor so as to generate combustion gas, and a high-pressure turbine that is rotationally driven by the combustion gas received from the burner and generates driving force for the compressor. An output turbine includes a low-pressure turbine that is driven by exhaust gas received from the high-pressure turbine and a power generator that is driven by the low-pressure turbine. A control device reduces opening degree of IGV of the compressor and thereby reduces power of the compressor, and the rotational frequency of the gas generator is increased in a full-speed no-load operating state of the power generator.