JP2004353614A - Fuel oil distributing and feeding device for gas turbine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel oil distributing and feeding device for a gas turbine for simplifying facilities. <P>SOLUTION: The fuel oil distributing and feeding device evenly distributing and feeding fuel oil to a plurality of combustors 12 of the gas turbine is provided with a flow divider 10 including a plurality of gear pumps corresponding to the combustor 12, a variable speed motor 20 rotating and driving the flow divider 10, and a control device 21 delivering fuel oil of flow rate according to demand flow rate of the gas turbine to the flow divider 10 by providing rotation speed control signal to the variable speed motor 20 based on demand flow rate signal of the gas turbine. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fuel oil distribution / supply device for a gas turbine using a gear pump type flow divider (fuel oil distributor).
[0002]
[Prior art]
For example, in a gas turbine having a multi-cylinder combustor, it is necessary to manage so that the flow rate of fuel oil supplied to each combustor is equal.
[0003]
As a means for uniformly supplying the fuel oil, a flow divider is generally used. The flow divider uniformly distributes and discharges fuel oil fed by the main fuel pump by rotation of gear pumps incorporated by the number of combustors. In a conventional flow divider, fuel oil is distributed and discharged toward a combustor in a fuel oil supply system by being rotationally driven by the pressure of the fuel oil itself pumped from a main fuel oil pump (see the following patent document). 1, Patent Document 2).
[0004]
FIG. 3 is a system diagram showing a configuration of a conventional fuel oil distribution and supply device for a gas turbine. In the figure, reference numeral 1 denotes a fuel oil tank located at a location remote from the gas turbine, reference numeral 2 denotes a fuel oil supply line for sending the fuel oil stored in the fuel oil tank 1 to the gas turbine, and reference numeral 3 denotes It is a fuel oil transfer pump for transferring fuel oil. A main fuel oil pump 4 for increasing the pressure of the supplied fuel oil is provided near the end of the fuel oil supply line 2, and a flow divider 10 is connected to the main fuel oil pump 4 via a pressure control valve 5 and a flow rate control valve 6. Each discharge hole 10 a of the flow divider 10 is connected to a fuel nozzle 13 of each combustor 12 of the gas turbine via a pipe 11. The opening of the flow control valve 6 is controlled based on the gas turbine control signal, and the differential pressure across the flow control valve 6 at that time is controlled by the pressure control valve 5 based on the signal of the differential pressure gauge 8, whereby The flow to the flow divider 10 is controlled by the operation of both valves 5 and 6.
[0005]
Reference numeral 15 in the figure denotes a starter motor of the flow divider, which is connected to a rotation shaft of the flow divider 10 via an overrunning clutch 16. The flow divider 10 includes as many gear pumps (not shown) as the number of the combustors 12, and these gear pumps are started by the power of the starting motor 15 at the time of starting, but are fueled at the time of normal operation. It is driven by oil pressure.
[0006]
When the operation of the gas turbine starts, the fuel oil is transferred by the fuel transfer pump 3 on the fuel oil supply line 2 and sent to, for example, a main fuel oil pump 4 driven by a shaft of the gas turbine. After the pressure is increased, it is sent to the flow divider 10 and distributed and supplied to each fuel nozzle 13 from each discharge hole 10 a of the flow divider 10. At this time, the discharge flow rate of the flow divider 10 is controlled by the operation of the pressure control valve 5 and the flow control valve 6.
[0007]
[Patent Document 1]
JP-A-55-68521 (FIG. 1)
[Patent Document 2]
JP-A-57-68527 (FIG. 1)
[0008]
[Problems to be solved by the invention]
In the above-described fuel oil distribution and supply device, a pressure control valve 5 and a flow control valve 6 are provided as a set on the fuel oil supply line 2, and the operation of these valves 5 and 6 allows the flow rate of fuel oil supplied to each combustor 12. However, since these valves have a large pressure loss, the fuel oil must be sent to the flow divider 10 at a correspondingly high pressure, and the large main fuel oil pump 4 is indispensable. In addition, since the pressure control valve 5 and the flow control valve 6 must be provided as a set, the equipment is complicated.
[0009]
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a fuel oil distribution and supply device for a gas turbine in which facilities are simplified.
[0010]
[Means for Solving the Problems]
The fuel oil distribution and supply device for a gas turbine according to claim 1, wherein the fuel oil distribution and supply device for a gas turbine supplies and distributes fuel oil evenly to a plurality of combustors of the gas turbine. A plurality of gear pumps, and a synchronous drive of the gear pumps to distribute and supply fuel oil at an equal flow rate to each of the combustors, and a variable speed for rotationally driving the flow divider. A control device that discharges fuel oil at a flow rate corresponding to the required flow rate of the gas turbine to the flow divider by providing a motor and a rotation speed control signal to the variable speed motor based on the required flow rate signal of the gas turbine. , Is provided.
[0011]
In this fuel oil distribution and supply device, the flow divider is forcibly rotated by a variable speed motor and the rotation speed of the gear pump is controlled, so that the flow rate of the fuel oil is controlled by the action of the flow divider itself. In addition, a set of a pressure control valve and a flow rate control valve which are conventionally provided can be omitted. In addition, since these valves become unnecessary, pressure loss is reduced, so that it is not necessary to equip a large-sized main fuel oil pump to send fuel oil at high pressure. Therefore, the equipment can be simplified.
[0012]
The fuel oil distribution and supply device for a gas turbine according to claim 2 is the fuel oil distribution and supply device for a gas turbine according to claim 1, wherein a fuel oil is supplied on a fuel oil supply line that supplies fuel oil to the flow divider. An auxiliary pump for controlling oil pressure is provided.
[0013]
In this fuel oil distribution and supply device, the pressure of the fuel oil can be controlled to an appropriate value by the auxiliary pump.
[0014]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is a system diagram of the fuel oil distribution and supply device of the first embodiment. In FIG. 1, reference numeral 1 denotes a fuel oil tank located at a location distant from the gas turbine, reference numeral 2 denotes a fuel oil supply line for sending fuel oil stored in the fuel oil tank 1 to the gas turbine, and reference numeral 3 denotes It is a fuel oil transfer pump for transferring fuel oil. The tip of the fuel oil supply line 2 is connected to the flow divider 10 via an emergency shutoff valve 22, and each discharge hole 10 a of the flow divider 10 is connected to a fuel nozzle 13 of each combustor 12 of a gas turbine via a pipe 11. It is connected.
[0015]
In this fuel oil distribution and supply device, a main fuel oil pump, a pressure control valve, and a flow rate control valve, which have been conventionally used, are eliminated from the fuel oil supply line 2. Instead, a built-in gear pump is provided in the flow divider 10. A variable speed electric motor 20 for synchronously driving (not shown) is connected. The flow divider 10 has a plurality of gear pumps corresponding to each of the combustors 12 as in the related art, and distributes and supplies the fuel oil at an equal flow rate to each of the combustors 12 by synchronously driving the gear pumps. However, the motor is not driven to rotate by the pressure of the pumping oil pressure, but is driven to rotate by the variable speed electric motor 20.
[0016]
The rotation of the variable speed electric motor 20 is controlled by a rotation speed control signal from the control device 21. The control device 21 supplies the variable speed electric motor 20 with a rotation speed control signal based on the required flow rate signal of the gas turbine, whereby fuel oil having a flow rate corresponding to the required flow rate of the gas turbine is discharged from the flow divider 10. It has become.
[0017]
As described above, the flow divider 10 is forcibly rotated by the variable speed electric motor 20, and the rotation speed of the gear pump is controlled, so that the flow rate of the fuel oil is controlled by the action of the flow divider 10 itself. In addition, the set of the pressure control valve and the flow rate control valve that have been conventionally used can be omitted. In addition, the elimination of these valves eliminates the need for a large-sized main fuel oil pump, thereby simplifying the equipment.
[0018]
FIG. 2 is a system diagram of a fuel oil distribution and supply device according to a second embodiment of the present invention. In this fuel oil distribution and supply device, an auxiliary pump 30 for controlling the pressure of the fuel oil, and an outlet pressure of the outlet pressure of the auxiliary pump 30 to the inlet side are provided on the fuel oil supply line 2 for feeding the fuel oil to the flow divider 10. A bypass valve 31 for adjusting the return amount is provided. The bypass valve 31 is operated based on a signal from a differential pressure gauge 32 that detects a differential pressure across the flow divider 10.
[0019]
By providing the auxiliary pump 30 in this manner, the pressure of the fuel oil sent to the flow divider 10 can be freely controlled. Therefore, the required pressure and flow rate of the fuel oil can be evenly distributed and supplied to the combustor 12. Since the auxiliary pump 30 does not need to generate a high pressure as compared with the conventional main fuel oil pump, the equipment cost does not increase.
[0020]
【The invention's effect】
As described above, according to the first aspect of the invention, a large-sized main fuel oil pump can be omitted in addition to the pressure control valve and the flow rate control valve, so that the equipment can be simplified.
According to the second aspect of the present invention, the pressure of the fuel oil can be appropriately controlled by the auxiliary pump, so that the fuel oil having the required pressure and flow rate is evenly distributed and supplied to the combustor. Can be.
[Brief description of the drawings]
FIG. 1 is a system diagram of a first embodiment of the present invention.
FIG. 2 is a system diagram of a second embodiment of the present invention.
FIG. 3 is a system diagram of a conventional fuel oil distribution and supply device.
[Explanation of symbols]
2 Fuel oil supply line 10 Flow divider 12 Combustor 20 Variable speed electric motor 21 Control device 30 Auxiliary pump

Claims (2)

In a fuel oil distribution and supply device for a gas turbine that distributes and supplies fuel oil evenly to a plurality of combustors of the gas turbine,
A flow divider having a plurality of gear pumps corresponding to each of the combustors, and synchronously driving these gear pumps to distribute and supply fuel oil at an equal flow rate to each of the combustors;
A variable speed motor for rotationally driving the flow divider;
A control device that discharges fuel oil of a flow rate corresponding to the required flow rate of the gas turbine to the flow divider by giving a rotation speed control signal to the variable speed motor based on the required flow rate signal of the gas turbine,
A fuel oil distribution and supply device for a gas turbine, comprising: The fuel oil distribution and supply device for a gas turbine according to claim 1,
A fuel oil distribution and supply device for a gas turbine, wherein an auxiliary pump for controlling pressure of the fuel oil is provided on a fuel oil supply line for feeding the fuel oil to the flow divider.

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