JPS61205339A - Fuel supply device - Google Patents

Abstract

PURPOSE:To enable worsening of fuel supply performance to be early detected, by calculating upper and lower limit fuel flows in a normal condition on the basis of a speed and an intake temperature of an engine while it is in starting and displaying abnormality when an actual fuel flow is not in a value between these upper and lower limit fuel flows. CONSTITUTION:A device provides detecting means 101-103 respectively detecting an engine speed, intake temperature and a fuel flow supplied to an engine. An arithmetic means 104, corresponding to detection signals of the engine speed and the intake temperature of the outputs of these detecting means 101-103, calculates upper and lower limit fuel flows necessary for the engine to normally generate an output. And the device, comparing in a comparing means 105 an output of said arithmetic means 104 with the output of the fuel flow detecting means 103, decides a fuel supply system being normal when the actual fuel flow is in a value between the upper and lower limit fuel flows while abnormal when the actual fuel flow is not in a value between the upper and lower limit fuel flows, displaying the decision result in a displaying means 106.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a fuel supply device suitable for supplying liquid fuel to the engine of a power generation device, for example. This is a fuel supply system diagram of the gas turbine power generator described in "Densetsu Kogyo J (July 1982 issue) K. In the diagram, (1) is a service tank, and 2) is provided on the fuel outlet side of this service tank. The low pressure fuel filter (8) filters the fuel passed through the low pressure fuel filter (2).
(4) is a high-pressure pump that pressurizes fuel to a predetermined pressure and sends it out; (6) is a high-pressure fuel filter installed on the outlet side of the high-pressure pump; (6) is a high-pressure fuel filter. Fuel control □ valve, which controls the fuel that passes through
(te) is the fuel tank, (8) is the fuel nozzle, (9) is the combustor, is the gas turbine, and (6) is the fuel control valve (6) to eliminate speed fluctuations due to load fluctuations. 4 is a gear box for decelerating the generator to an appropriate rotational speed, α is a speed detection sensor that detects the rotational speed of the gas turbine, - is the signal of the speed detection sensor a field (not shown) A speed regulator that adds the deviation from the speed command to the governor (6) is shown.

In FIG. 6, fuel in the service tank (1) is filtered through a low pressure fuel filter (2) and then pumped by a booster pump (8) to a high pressure pump (4). The high-pressure pump (4) is connected to the gas turbine via the gear box 4, pressurizes the fuel sent from the booter pump (8) to a predetermined pressure, and the high-pressure fuel filter (
6) into the turbine cry via.

At this time, the fuel control valve (6) is adjusted according to the angle of the governor (6).
) adjusts the fuel flow rate so that an appropriate amount of fuel corresponding to the rotational speed of the gas turbine (to) is injected from the fuel nozzle (8).

[Problem that the invention seeks to solve]

The conventional fuel supply system is constructed as described above, and many elements are interposed between the service tank (1) and the fuel nozzle (8), and the pump and valves occupy a narrow space. Because it has moving parts, it is prone to breakdowns and may not be able to supply enough fuel.For example, malfunction of the booster pump (8) may cause the fuel pressure on the suction side of the high-pressure pump (4) to drop. If the fuel supply performance is too low, cavitation may occur and startup may fail.0 However, this conventional device did not have a means to detect such deterioration in fuel supply performance at an early stage, so there was concern about unforeseen situations. The issue was not resolved and the reliability was lacking accordingly.

The present invention has been made to solve these problems, and aims to provide a fuel supply system that can detect a decrease in fuel supply performance at an early stage, thereby significantly improving reliability.

[Means for solving problems]

As shown in FIG. 1, the fuel supply device according to the present invention has the following features:
Detection means (101) to (101) for detecting the carrot rotation speed, intake air temperature, and fuel flow rate supplied to the engine, respectively.
103), and calculation means (10 and 10) for calculating the upper limit fuel flow rate and lower limit fuel flow rate necessary for the engine to output normally, in accordance with the engine rotation speed and intake air temperature obtained by these detection means. Comparison means (105) compares the output of this calculation means with the output of the detection means that detects the actual fuel flow rate, and based on the comparison result of this comparison means, the actual fuel flow rate is determined to be between the upper limit fuel flow rate and the lower limit fuel flow rate. 0 [Function] In the present invention, the engine outputs a normal output in accordance with the rotational speed of the engine. The upper limit fuel flow rate and lower limit fuel flow rate necessary for
The comparison means (105) compares the calculation result with the detected value of the actual fuel flow rate, and if the detected value of the fuel flow rate is between the upper limit fuel flow rate and the lower limit fuel flow rate, it is determined that the fuel supply system is normal. This system determines that the fuel supply system is abnormal when the detected value of the fuel flow rate is not within this interval.
especially.

By displaying this abnormality by the display means (106), a decrease in fuel supply performance is detected at an early stage.0 [Embodiment] Fig. 2 is a diagram illustrating the configuration of an embodiment of the present invention, and (1) to 4 are 0, which is completely the same as the conventional device, and the other (to) is an automatic inspection device whose main part is a microcomputer, and (to) is an automatic inspection device that detects the intake air temperature of the gas turbine 4 and sends the detection signal ( (b) shows a combustion intake air temperature detection device to be added, and (b) shows a fuel flow rate detection device that detects the fuel flow rate at the outlet side of the service tank (1) and sends a detection signal to the automatic inspection device (b). Automatic inspection device (
To) K also captures the rotational speed detection signal of the speed regulator σ4.0 Figure 3 is a block diagram showing the detailed configuration of the automatic inspection device (B), and the combustion intake air temperature detection device (To) , fuel flow rate detection device (b), rotation speed detection device m in the speed regulator (4)
+, an input device that inputs the output signals of m and converts them into signals that can be subjected to logical judgments and calculations, and a memory that stores programs, input data, and calculation result data for executing these logical judgments and calculations. An arithmetic control device 8 that takes in data from an input device according to the contents of the device example and the program built into this storage device, executes logical judgments and operations, and outputs the results to the storage device example or outside.
s) and an output device that converts the results determined by the arithmetic and control device 185) into signals that can operate an external display device or auxiliary relay. Therefore, the operation of this embodiment will be explained with reference to a diagram showing the relationship between the rotational speed N of the turbine and the fuel flow rate. ) - determines whether the gas turbine noise has reached the ignition speed, and after reaching the ignition speed, reads the combustion intake air temperature T between steps. Next, in step -, the gas turbine Wait for one second as the speed approaches the rated speed, and then turn on the rotation speed detection device (analog) in step ■.
1) Read and store the rotational speed Ni detected by the fuel flow rate detection device (b) and the fuel flow rate Wfi detected by the fuel flow rate detection device (b). When the rated speed is reached, proceed to the next step and set the rotation speed N and fuel flow rate Wf shown in Fig. 4.
By using the relational expression corresponding to the diagram showing the relationship between the two, the upper limit fuel flow rate HWfi in the normal state can be determined for each actual rotational speed Ni of the gas turbine.

Calculate the lower limit fuel flow rate LWfi. Note that the upper limit fuel flow rate HWfi and the lower limit fuel flow rate LWfi are corrected using a conversion formula because as the intake air temperature increases, the fuel flow rate increases even in a normal state.

Next, during one step, the fuel flow rate Wfi detected by the fuel flow rate detection device (b) is compared with the upper limit fuel flow rate IWfi and the lower limit fuel flow rate LWf i, and between these, Hwfl
) wrt ) If the relationship is Lwrt, a signal indicating that the fuel supply status is "normal" is output with a step, and H
If the relationship is Wfi (Wfi or Wfi (LWfi), a signal indicating that the fuel supply state is "abnormal" is output in step -.

Thus, the results of these inspections are not only displayed on the display device, but also provide an alarm to others using the auxiliary relay.

In the above embodiment, the inspection results are displayed on the display device, but if the engine speed and fuel flow rate are typed out together, it is possible to understand the situation in more detail when an abnormality occurs. can be dug.

In addition, in the above embodiment, when an abnormality is determined only once, it is immediately displayed, but if "abnormal" is displayed for the first time when an abnormality is determined twice in a row, the rate of erroneous determination due to disturbance etc. becomes less.

Furthermore, in the above embodiments, a fuel supply system for an emergency gas turbine power generation system has been described, but the present invention is not limited to this, and may be applied to a regular engine, an engine other than a gas turbine, or a fuel supply system other than a power generation system. It is also applicable to engine fuel supply devices.

〔Effect of the invention〕

As is clear from the above description, according to the present invention, the rotation speed, fuel flow rate, and combustion intake temperature are detected during engine startup, and based on the rotation speed and combustion intake temperature, the upper limit and lower limit of the fuel flow rate in the normal state are detected. Calculate the fuel flow rate,
Furthermore, if the detected actual fuel flow rate is not between the upper limit fuel flow rate and the lower limit fuel flow rate, the display will indicate an "abnormality".
, it is possible to reliably detect a decline in fuel supply performance at an early stage, and since there is no risk of startup failure, it is possible to significantly improve the reliability of the device.

[Brief explanation of the drawing]

FIG. 1 is a block diagram showing the configuration of the present invention, FIG. 2 is an explanatory diagram of the configuration of an embodiment of the invention, FIG. 3 is a block diagram showing the detailed configuration of the main elements of the embodiment, and FIG. The figure is a line diagram for explaining the operation of the same embodiment, FIG. 5 is a flowchart for explaining the operation of the same embodiment, and FIG. 6 is a fuel supply system diagram showing the configuration of a conventional fuel supply device. . <1): ? -Vist tank (4): High pressure pump (6
): Fuel control valve Gas turbine a@: Speed regulator (To): Automatic inspection device α phrase = Combustion intake air temperature detection device α′Q: Fuel flow rate detection device 11311, View: Rotation speed detection device + ′ -, N 1 C+='I;i door 18al=・Input device Example: Storage device m+: Arithmetic control device -: Output device-2 Insertion device (1
01): Rotation speed detection means (j02): Temperature detection means (103): Flow rate detection means (104): Calculation means (105): Comparison means (
106): Display means Note that the same reference numerals in each figure indicate the same or corresponding parts.

Claims (1)

[Claims] A fuel supply device for supplying fuel to an engine that drives a rotating machine, comprising: a rotation speed detection means for detecting the rotation speed of the engine; a temperature detection means for detecting the intake air temperature of the engine; and a fuel supplied to the engine. a flow rate detection means for detecting the flow rate, a calculation means for calculating an upper limit fuel flow rate and a lower limit fuel flow rate necessary for the engine to output normally, based on the output signals of the rotation speed detection means and the temperature detection means; a comparison means for comparing the output of the calculation means and the output of the flow rate detection means, and based on the comparison result of the comparison means, the actual fuel flow rate detected by the flow rate detection means is calculated by the calculation means. 1. A fuel supply device comprising display means for displaying that a fuel supply state is abnormal when the fuel flow rate is not between an upper limit fuel flow rate and a lower limit fuel flow rate.