FUEL SYSTEM OF GAS TURBINE ENGINE Russian patent published in 2019 - IPC F02C9/32 F02C3/20 F02K9/44 

FIELD: machine building.

SUBSTANCE: invention relates to cryogenic equipment, power engineering and engine building for ground location and vehicles, mainly to fuel systems of gas turbine engine for supply of liquefied natural gas or other type of cryogenic fuel. Set tasks in fuel system of gas turbine engine mainly for supply of cryogenic fuel containing cryogenic fuel tank connected in series through cutoff valve, cryogenic fuel pump, heat exchanger-steam generator, separator of liquid and vapor phases of cryogenic fuel, first flow rate regulator with nozzles in combustion chamber of gas turbine engine, are solved by that it additionally contains ejector pump, which active liquid phase inlet is connected to the cryogenic fuel pump outlet, and its first passive input is connected to the liquid phase outlet from the liquid and vapor phase separator of the cryogenic fuel, wherein output of ejector pump is connected to input of heat exchanger-steam generator, and in that between first passive input of ejector pump and outlet of liquid phase from separator of liquid and vapor phases of cryogenic fuel there is a shut-off valve connected to control unit, and in that the shut-off valve is closed when the operating mode of the gas turbine engine exceeds 0.4…0.6 of nominal; and with reduction of operating mode of gas turbine engine below 0.4…0.6 of nominal, shut-off valve is opened, and by the fact that at the inlet of the liquid and vapor phases separator of the cryogenic fuel temperature and pressure sensors are installed, connected to the control unit, at cryogenic fuel temperature higher by 3…5 degrees of temperature on line of saturation at pressure less than or equal to critical value or above temperature on line of phase transition liquid-gas at pressure above critical value shut off valve, and at temperature of cryogenic fuel is less than temperature, which is by 0.1…2 degrees above temperature on saturation line at pressure less than or equal to critical value or higher temperature on liquid-gas phase transition line at pressure above critical value, opening shutoff valve, and that in order to reduce the dimensions and weight of the cryogenic fuel pump, the output from the cutoff valve is further connected through the second flow rate controller to the second passive inlet to the ejector pump, wherein the second flow rate controller is connected to the control unit, as well as by the fact that the second flow rate regulator is opened with the closed shutoff valve, and before the opening of the shut-off valve, the second flow rate regulator is closed.

EFFECT: improving operating efficiency of cryogenic fuel system of gas turbine engine due to increased stability of operation and reduction of its overall weight characteristics.

6 cl, 5 dwg