A control device causes a combined cycle plant to perform a first operation section, a second operation section, and a third operation section. In the first operation section, a first gas turbine unit and a steam turbine are driven without driving an auxiliary combustion device. The control device causes the plant to perform the second operation section in which the first gas turbine unit, the auxiliary combustion device, and the steam turbine are driven when a required output equal to or greater than a maximum output in the first operation section is received. The control device causes the plant to perform the third operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving an auxiliary combustion device when a required output equal to or greater than a maximum output in the second operation section is received.

Reduction of operation efficiency of a GTCS at a time of changing an operation using bypass stack to an operation using HRSG is suppressed. An HRSG of the GTCS is provided with an air supply piping and a ventilation piping connected to a fuel line of a duct burner at a position upstream of a main shut-off valve and downstream of a fuel shut-off valve, an air supply shut-off valve that opens/closes the air supply piping, and a ventilation shut-off valve that opens/closes the ventilation piping, and is configured such that during an operation using a bypass stack, an inlet of the HRSG is closed to open a bypass stack, a main shut-off valve and the fuel shut-off valve are closed, and the air supply shut-off valve and the ventilation shut-off valve are always opened, and at a time of changing to an operation using HRSG, the inlet of the HRSG is opened to close the bypass stack without shutting down a GT, the main shut-off valve and the fuel shut-off valve are opened, and the air supply shut-off valve and the ventilation shut-off valve are closed.

A contact arm and a method for a disconnect switch, having a profile body and a contact element in electrical contact with the profile body to establish electrical contact with a contact counterpart. The profile body has a first diameter parallel to the contact element. The contact element has a concave surface with a radius of curvature and is arranged on a side directed away from the profile body. The radius of curvature is smaller than the radius of curvature of a circle segment having the first diameter of the profile body. The method includes a contact element of the contact arm establishing electrical and/or mechanical contact with a contact counterpart. A concave surface of the contact element which is directed towards the contact counterpart has a radius of curvature, which is smaller than the radius of curvature of a circle segment having the maximum diameter of the contact element.

The present disclosure relates to combined gas and steam power plants. Various embodiments may include methods for operating such plants, such as: generating hot steam with an exhaust gas of a gas turbine; driving a generator with the steam; diverting at least a part of the generated steam and storing the diverted steam in a steam accumulator; then, discharging at least a part of the steam stored in the steam accumulator from the steam accumulator; heating the steam discharged from the steam accumulator with heat released during an exothermic chemical reaction; and feeding the heated steam to drive the turbine device.

An emissions reduction system for a combined cycle power plant having a gas turbine engine and a heat recovery steam generator (HRSG) can comprise a duct defining a flow space configured to receive exhaust gas from the gas turbine and convey the exhaust gas into the HRSG, and a louver system coupled to the duct that can comprise a plurality of emission medium panels extending across the flow space, the emission medium panels configured to be moved between a first position where adjacent filter medium panels extend contiguously across the flow space of the duct and a second position where adjacent filter medium panels include spaces therebetween to provide an unobstructed flow path and an actuator to move the plurality of panels between the first position and the second position.

A method for energy generation includes receiving, at a carbon negative energy generation system, input including calcium oxide and water and reacting, within a reaction chamber of the carbon negative energy generation system, the calcium oxide and water to release energy and generate calcium hydroxide. The method further includes directing, by the carbon negative energy generation system, the released energy to facilitate propulsion or onboard electricity generation and dispensing, by the carbon negative energy generation system, the calcium hydroxide into the ocean to sequester atmospheric CO.sub.2.

An absorption column is equipped with: a CO.sub.2 absorption section absorbing CO.sub.2 from CO.sub.2-containing exhaust gas using a lean solution; a main rinse section recovering an entrained CO.sub.2 absorbent using rinse water; a rinse water circulation line circulating a rinse water containing the CO.sub.2 absorbent recovered in a liquid storage section of the main rinse section; a pre-rinse section provided between the CO.sub.2 absorption section and the main rinse section; a rinse section extraction liquid supply line extracting a portion of the rinse water containing the CO.sub.2 absorbent from the rinse water circulation line, and introducing the same into a reflux section of an absorption liquid regeneration tower; and a refluxed water supply line extracting a portion of refluxed water, introducing the same as pre-rinse water for the pre-rinse section, and connected on the pre-rinse section side.

A method for flexible operation of a power plant having a recovery steam generator having heat exchanger stages for generating live steam and/or reheater steam for a steam turbine from an exhaust flow of a gas turbine, wherein auxiliary firing is arranged in a flue gas channel of the recovery steam generator in the region of the heat exchanger stages. In order to regulate the live steam and/or the reheater steam, at least one injection cooling device is brought online directly upon using the auxiliary firing.

A control device causes a combined cycle plant to perform a first operation section, a second operation section, and a third operation section. In the first operation section, a first gas turbine unit and a steam turbine are driven without driving an auxiliary combustion device. The control device causes the plant to perform the second operation section in which the first gas turbine unit, the auxiliary combustion device, and the steam turbine are driven when a required output equal to or greater than a maximum output in the first operation section is received. The control device causes the plant to perform the third operation section in which the first gas turbine unit, the second gas turbine unit, and the steam turbine are driven without driving an auxiliary combustion device when a required output equal to or greater than a maximum output in the second operation section is received.

To provide a combined cycle plant, a control device thereof, and a steam turbine startup method that are aimed at improving the operability of a combined cycle plant by allowing a quick change of the output. A combined cycle plant is provided with: a gas turbine having a compressor, a combustor, and a turbine; a supplementary firing burner that raises the temperature of exhaust gas of the gas turbine; a heat recovery steam generator that generates steam using exhaust heat of the exhaust gas; a steam turbine that is driven by steam generated by the heat recovery steam generator; and a control device that changes both an output of the combustor and an output of the supplementary firing burner when an output of the combined cycle plant is to be changed.