| 摘要 |
PROBLEM TO BE SOLVED: To reduce the number of valves by replacing a pressure regulating valve and a flow regulating valve with one valve in which the pressure regulating valve and the flow regulating valve are integrally formed, in a fuel flow rate control method by virtual division of a gas turbine and a combined plant. SOLUTION: One control valve is provided in a fuel system in place of a pressure regulating valve and a flow regulating valve. Front pressure and rear pressure are inputted to a calculating part (A) 11 inside a control device 10 from pressure detecting device 2, 3, respectively, and opening signal of the flow regulating valve is inputted from a conventional control device 30 to obtain a characteristic CV2 of the conventional flow regulating valve. Further, a characteristic CV1 of the pressure regulating valve is found by the characteristic CV2, the front pressure P1, and the rear pressure P2. A combined characteristic CVS of the flow regulating valve and the pressure regulating valve are found from the obtained CV1 and CV2 in a calculating part (B) 12 and outputted to a function generator 13. An integrated opening signal of the control valve 1 is outputted in the function generator 13 corresponding to the CVS to control the control valve 1. As the control valve 1 is controlled at an optimum opening degree by providing one valve and virtually dividing into the pressure regulating valve and the flow regulating valve in the control device 10, the control, the number of valves in a fuel system can be reduced.
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