초록 ▼

A power generation system having an exhaust gas attemperating device and method for controlling a temperature of exhaust gases is provided. The exhaust gas attemperating device includes a first conduit and a venturi member. The first conduit is configured to receive at least a portion of exhaust gas

A power generation system having an exhaust gas attemperating device and method for controlling a temperature of exhaust gases is provided. The exhaust gas attemperating device includes a first conduit and a venturi member. The first conduit is configured to receive at least a portion of exhaust gases from a gas turbine. The venturi member is disposed in the first conduit and defines a flow path therethrough for receiving the exhaust gases in the first conduit. The first conduit and the venturi member have an aperture extending therethrough communicating with the flow path, such that the exhaust gases flowing through the flow path draws ambient air through the aperture into the flow path for reducing a temperature of the exhaust gases flowing through the first conduit.

대표청구항 ▼

1. An exhaust gas attemperating device, comprising: a first conduit configured to receive at least a portion of exhaust gases from a gas turbine; and a venturi member disposed in the first conduit, the venturi member being co-axially surrounded by the first conduit and defining a flow path therethro

1. An exhaust gas attemperating device, comprising: a first conduit configured to receive at least a portion of exhaust gases from a gas turbine; and a venturi member disposed in the first conduit, the venturi member being co-axially surrounded by the first conduit and defining a flow path therethrough for receiving the exhaust gases in the first conduit, the first conduit and the venturi member having an aperture extending therethrough communicating with the flow path, such that the exhaust gases flowing through the flow path draws ambient air through the aperture into the flow path for reducing a temperature of the exhaust gases flowing through the first conduit. 2. The exhaust gas attemperating device of claim 1 further comprising an intake duct and a throttle valve, the intake duct being in fluid communication with the aperture, the throttle valve being coupled to the intake duct and configured to move between an open operational position and a closed operational position, such that the ambient air passes through the intake duct and the aperture into the flow path when the throttle valve is moved to the open operational position, and the throttle valve blocks the intake duct when the throttle valve is moved to the closed operational position. 3. The exhaust gas attemperating device of claim 2 further comprising a first actuator coupled to the throttle valve, the first actuator being configured to move the throttle valve between the open operational position and the closed operational position. 4. The exhaust gas attemperating device of claim 1 wherein the venturi member includes a stationary portion and a movable portion operably coupled to the stationary portion, the stationary portion being mounted to the first conduit, the movable portion being configured to move between a dilated position and a constricted position, such that the flow path has a first cross-sectional area when the movable portion is moved to the dilated position, and the flow path has a second cross-sectional area when the movable portion is moved to the constricted position, the second cross-sectional area being less than the first cross-sectional area such that more ambient air is drawn into the flow path when the movable portion is moved to the constricted position. 5. The exhaust gas attemperating device of claim 4 further comprising a venturi actuator coupled to the movable portion, the venturi actuator being configured to move the movable portion between the dilated position and the constricted position. 6. A system for controlling a temperature of exhaust gases from a gas turbine, comprising: an exhaust gas attemperating device including a first conduit and a venturi member disposed in the first conduit, the first conduit being configured to receive at least a portion of exhaust gases from a gas turbine, the venturi member defining a flow path therethrough for receiving the exhaust gases in the first conduit, the first conduit and the venturi member having an aperture extending therethrough communicating with the flow path, such that the exhaust gases flowing through the flow path draws ambient air through the aperture into the flow path for reducing a temperature of the exhaust gases flowing through the first conduit;an intake duct in fluid communication with the aperture;a throttle valve coupled to the intake duct, the throttle valve being configured to move between an open operational position and a closed operational position, such that the ambient air passes through the intake duct and the aperture into the flow path when the throttle valve is moved to the open operational position, and the throttle valve blocks the intake duct when the throttle valve is moved to the closed operational position;a first actuator coupled to the throttle valve, the first actuator being configured to move the throttle valve between the open operational position and the closed operational position;a first temperature sensor configured to generate a first signal indicative of a temperature of steam passing from a heat recovery steam generator to a steam turbine, the heat recovery steam generator being configured to receive the exhaust gases from the gas turbine and generate steam from heat of the exhaust gases;a second temperature sensor coupled to a portion of the steam turbine, the second temperature sensor being configured to generate a second signal indicative of a temperature of the portion of the steam turbine; anda controller configured to receive the first signal from the first temperature sensor and the second signal from the second temperature sensor, the controller being further configured to generate a temperature difference value indicative of a temperature difference based on the first and second signals, the controller being further configured to induce the first actuator to move the throttle valve to the open operational position when the controller determines that the temperature difference value is greater than a first threshold value, the controller being further configured to induce the first actuator to move the throttle valve to the closed operational position when the controller determines that the temperature difference value is less than a second threshold value, the second threshold value being less than the first threshold value. 7. The system of claim 6 wherein the venturi member includes a stationary portion and a movable portion operably coupled to the stationary portion, the stationary portion being mounted to the first conduit, the movable portion being configured to define the flow path and move between a dilated position and a constricted position, such that the flow path has a first cross-sectional area when the movable portion is moved to the dilated position, and the flow path has a second cross-sectional area when the movable portion is moved to the constricted position, the second cross-sectional area being less than the first cross-sectional area, such that more ambient air is drawn into the flow path when the movable portion is moved to the constricted position. 8. The system of claim 7 further comprising a venturi actuator coupled to the movable portion, the venturi actuator being configured to move the movable portion between the dilated position and the constricted position. 9. The system of claim 8 wherein the controller is configured to induce the venturi actuator to move the movable portion to the constricted position when the controller determines that the temperature difference value is greater than the first threshold value, the controller being further configured to induce the venturi actuator to move the movable portion to the dilated position when the controller determines that the temperature difference value is less than the second threshold value. 10. A power generation system, comprising: a gas turbine configured to burn a mixture of fuel and compressed air for producing exhaust gases;an exhaust gas attemperating device configured to receive the exhaust gases from the gas turbine, the exhaust gas attemperating device includes a first conduit and a venturi member disposed in the first conduit, the first conduit configured to receive at least a portion of the exhaust gases from the gas turbine, the venturi member being co-axially surrounded by the first conduit and defining a flow path therethrough for receiving the exhaust gases in the first conduit, the first conduit and the venturi member having an aperture extending therethrough communicating with the flow path, such that the exhaust gases flowing through the flow path draws ambient air through the aperture into the flow path for reducing a temperature of the exhaust gases flowing through the first conduit;a heat recovery steam generator configured to receive the exhaust gases from the exhaust gas attemperating device and generate steam from heat of the exhaust gases; anda steam turbine configured to receive the steam from the heat recovery steam generator and rotate in response to an expansion of the steam. 11. The power generation system of claim 10 further comprising exhaust gas regulation comprising an intake duct and a throttle valve, the intake duct being in fluid communication with the aperture, the throttle valve being coupled to the intake duct and configured to move between an open operational position and a closed operational position, such that the ambient air passes through the intake duct and the aperture into the flow path when the throttle valve is moved to the open operational position, and the throttle valve blocks the intake duct when the throttle valve is moved to the closed operational position.