초록 ▼

A system is disclosed for draining residual fuel from the engine manifold of a gas turbine which includes an ejector having an inlet port for receiving high pressure fuel from a main fuel pump at engine shut-down, an outlet port and a suction port. The ejector defines a nozzle that extends between t

A system is disclosed for draining residual fuel from the engine manifold of a gas turbine which includes an ejector having an inlet port for receiving high pressure fuel from a main fuel pump at engine shut-down, an outlet port and a suction port. The ejector defines a nozzle that extends between the inlet port and the outlet port for increasing the velocity of high pressure fuel flowing therethrough at engine shut-down so as to create suction at the suction port. A motive valve controls the flow of high pressure fuel between the main fuel pump and the inlet port of the ejector. The motive valve is configured for movement between a first position wherein high pressure fuel is directed from the main fuel pump to the engine manifold during engine start-up and operation, and a second position wherein high pressure fuel is directed from the main fuel pump to the inlet port of the ejector at engine shut-down. A drain valve controls the flow of residual fuel between the engine manifold and the suction port of the ejector. The drain valve is configured for movement between a closed position and an open position as the motive valve moves between the first position and the second position, such that residual fuel is drawn from the engine manifold under suction to the inlet port of the ejector. A fuel recycle conduit is provided for delivering the residual fuel from the outlet port of the ejector to the fuel tank.

대표청구항 ▼

1. A system for draining residual fuel from the engine manifold of a gas turbine, the gas turbine operatively associated with a fuel metering unit having a main fuel pump for delivering high pressure fuel to the engine manifold, a boost pump for delivering low pressure fuel from a fuel tank to the m

1. A system for draining residual fuel from the engine manifold of a gas turbine, the gas turbine operatively associated with a fuel metering unit having a main fuel pump for delivering high pressure fuel to the engine manifold, a boost pump for delivering low pressure fuel from a fuel tank to the main fuel pump, and a shutoff valve for controlling the flow of high pressure fuel between the engine manifold and the main fuel pump, the system comprising:a) an ejector having an inlet port for receiving high pressure fuel from the main fuel pump at engine shut-down, an outlet port and a suction port, the ejector defining a nozzle extending between the inlet port and the outlet port for increasing the velocity of high pressure fuel flowing therethrough at engine shut-down so as to create suction at the suction port; b) a motive valve for controlling the flow of high pressure fuel between the main fuel pump and the inlet port of the ejector, the motive valve configured for movement between a first position wherein high pressure fuel is directed from the main fuel pump to the engine manifold during engine start-up and operation, and a second position wherein high pressure fuel is directed from the main fuel pump to the inlet port of the ejector at engine shut-down; c) a drain valve for controlling the flow of residual fuel between the engine manifold and the suction port of the ejector, the drain valve configured for movement between a closed position and an open position and an open position as the motive valve moves between said first position and said second position, such that residual fuel is drawn from the engine manifold under suction to the inlet port of the ejector; and d) a solenoid valve in fluid communication with the low pressure side of the main fuel pump by a fuel line and the high pressure side of the main fuel pump by a siphon line for controlling the simultaneous operation of the motive valve and the drain valve.