专利名称：FUEL CONTROL SYSTEMS FOR DUAL FUEL
GAS TURBINE ENGINES
发明人：EUGENE HAROLD WARNE申请号：US3577877D申请日：19690303公开号：US3577877A公开日：19710511
摘要：1,251,804. Gas turbine engine fuel systems. JOSEPH LUCAS (INDUSTRIES) Ltd.Feb.11, 1969 [Nov.23, 1967], No. 53360/67. Heading F1G. A control system for a dual-fuelgas turbine engine comprises a servo-operated valve device incorporating a pair of valveparts 11, 12 for controlling the flow of the two fuels respectively, the valve parts beingcoupled together for movement both angularly and axially, the arrangement being suchthat at opposite limits of the angular movement of the valve parts the flow of theirrespective fuels is completely prevented and, for any given axial position in which thevalve parts are treated by the action of the associated servomechanism, the amount offuel which can flow to the engine under the control of one of the valve parts when in onelimiting angular position is equivalent, in terms of the requirements of the engine, to theamount of the other fuel which can flow to the engine under the control of the valveparts in the other limiting angular position. This permits a changeover from one fuel tothe other while the engine is running. The valve part 11 controls the flow of liquid fuelfrom a pump 25 having a stroke-varying servo controlled by a leak-off valve 29 actuatedby a diaphragm 27 subjected to the pressure drop across the valve part 11. The valvepart 12 controls the flow of gaseous fuel from a constant pressure valve 24. The valve
parts 11, 12 have ports 19, 21 respectively cooperating with respective ports 18, 23 insleeves 14, 15, so that axial displacement of the valve ports throttles the flow throughthe ports. The ports 18, 19 are so angularly orientated relative to the ports 21, 23 thatwhen the valve parts 11, 12 are rotated to bring the ports 18, 19 into alignment, theports 21, 23 are completely out of aligment, and vice versa, whereby the changeover fromone fuel to the other can be effected. The servomechanism for controlling the axialposition of the valve parts 11, 12 under the influence of the compressor discharge andatmospheric pressures and a governor driven by a separate power turbine and forpreventing overspeeding of the engine (with correction for variation of ambient
temperature) is the same as that described in Specification 1,251, 799, but in this case thepressure fluid used for operating the servo-mechanism is liquid fuel instead of gaseousfuel. When the engine is operating wholly on gaseous fuel, a valve 64 is operated to cut-off the chamber 20 downstream of the valve part 11 from the burners and to connect itinstead to the low-pressure reservoir from which liquid fuel is drawn by the pump 25, toprovide a return path for the liquid fuel flowing through the passage 33 of the servo-mechanism.
申请人：JOSEPH LUCAS INDUSTRIES LTD.
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