JPS5960117A - Fuel pressure controller - Google Patents

Abstract

PURPOSE:To enable to control fuel pressure at the starting of a plant to proper pressure, by a method wherein a pressure reducing valve and a controller for the pressure reducing valve are provided in order to control pressure between a main control valve for fuel and a fuel stop valve. CONSTITUTION:A pressure reducing piping 7, branched from a piping 2 running between a main control valve 3 for fuel and a fuel stop valve 4, and a pressure reducing valve 8 connected thereto are controlled by an electromagnetic valve 9 driven by the signal of a controller 10. In which case, the pressure reducing piping 7 is connected between the main control valve 3 for fuel and the fuel stop valve 4, and is open to the open air through a pressure reducing valve 8 or is connected to a blow tank not shown. Thus, by opening the pressure reducing valve 8, the fuel flows through the piping 7 to the open air, having lower pressure, or the blow tank. Namely, in case of fuel pressure between the main control valve 3 for fuel and the fuel stop valve 4 being high, the pressure reducing valve 8 is opened, and this permits fuel pressure to be reduced to ordinary pressure or below.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to a fuel pressure control device, and particularly to a fuel pressure control device for supplying fuel to a combustor such as a gas turbine.

[Technical background of the invention]

FIG. 1 shows a conventional fuel pressure control device of this type, which includes a fuel supply device 1, a piping system 1, and a fuel source pressure control valve 3.
, Fuel Stop Valve, Fuel Control Valve! , and a combustor B. In other words, the fuel in the fuel supply device L passes through the joint venture 3. Here, the fuel source pressure control valve 3 is installed in each system or several systems to control the fuel supply as a whole.Furthermore, the fuel stop valve part is used to control the fuel supply in the event of an abnormality in the plant. The fuel control valve j controls the fuel flow rate from the fuel supply device/to the combustor 2 based on the plant control signal.

Here, in order to improve the safety and controllability of the plant, the fuel stop valve ≠ and the fuel control valve! is installed near the combustion Bt, and the fuel source pressure regulating valve 3 is often installed at a location 1c away from the fuel stop valve due to the equipment layout of the entire plant.

Although only one system is shown in Fig. 1, the fuel pressure at the outlet of the fuel supply system fff/ is generally pressurized 7', and fuel can be supplied to several combustor systems. I can do it.

[Problems with background technology]

When a plant with the above devices is stopped, the fuel stop valve and fuel control valve are used! fully closes with an extremely small delay (0.7 to 0.2 seconds) relative to the stop signal. However, the fuel oil 1 source pressure control valve 3 does not close instantly, but after the fuel stop valve closes, it gradually closes and fully closes as the fuel pressure between the fuel stop valve and the fuel source pressure control valve 3 becomes dry. becomes. On this occasion,
Since the fuel source pressure control valve 3 normally uses a globe valve,
Even when the valve was fully closed to shut down the plant, a very small amount of leakage could occur.

In addition, since this is a stopped state, after the plant is stopped, the fuel pressure of moJ of the fuel source pressure control valve 3 and fuel stop valve is the same as that of the fuel control valve! The pressure is higher than the required pressure of equipment such as combustor t and combustor t, and therefore pressurized fuel is not supplied to combustor t upon restart, resulting in ignition failure. This had the disadvantage of causing defects.

[Purpose of the invention]

This invention was made in an attempt to eliminate the above-mentioned drawbacks of the prior art, and aims to provide a fuel pressure control device that can maintain the fuel pressure at an appropriate pressure when starting up a plant. .

[Summary of the invention]

In order to achieve this objective, the present invention provides a piping system FJf, K that connects the fuel storage and fuel supply device to the combustor that burns the fuel, and a fuel source that collectively controls the fuel supply. A fuel adjustment valve, a fuel stop valve that instantly stops fuel supply in the event of an abnormality in the plant, and a plant f
In a fuel pressure control device comprising a fuel control valve that controls the fuel flow rate from the fuel supply device to the combustor based on No. In order to control the pressure of the piping system, a pressure reducing valve and a control device for this pressure reducing valve are provided.

[Embodiments of the invention]

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings. In each drawing, the same reference numerals indicate similar objects.

FIG. 2 shows an embodiment of the present invention, and shows the same system as FIG. 1.

According to the same figure, a pressure reducing pipe 7 and a pressure reducing valve r connected thereto are connected to a pipe λ between the fuel source pressure control valve 3 and the fuel stop valve Hiroshi.
The anus is indicated. This pressure reducing valve ♂ is opened and closed by a solenoid valve driven by a signal from the control device RtO.

Here, the pressure reducing pipe 7 is connected to the fuel source pressure regulating valve 3 and the fuel stop valve fL, and is opened to the atmosphere via the pressure reducing valve g or connected to a blow tank (not shown).

Therefore, by opening the pressure reducing valve g, the large amount of fuel flows out through the pipe 7 to the atmosphere with low pressure or to the blow tank. That is, by opening the pressure reducing valve ♂ when the fuel pressure between the fuel source pressure regulating valve 3 and the fuel stop valve ♂ is high, the fuel pressure can be made equal to or below the Royal Palace pressure.

Such operations are performed by the control device 10K, the specific configuration of which is shown in FIG. 3, for example.

In each drawing below, "-1←" indicates an electrical signal, and "-←ner" indicates an air signal.

According to the figure, the control device 10 has three OR circuits 10/
, /θλ, IO'l, tie=? I03. It is configured with a wire de-or circuit 103 and an artificial circuit including an O inverter 106, and starts (i No. 61/, or bet start I No. 6 E1.2 and bet end signal s3).
It is driven by

The output of the OR circuit 10/, which takes the start signal 8/ as one input, becomes one input of the OR circuit 102, and also serves as one input of the timer 1.
0.3 to the other input of the OR circuit 10/. The other input of the OR circuit 102 is the OR circuit io8! or the output of ios, the vent start signal S2 is input to the OR circuit 1oit, and the vent end signal S3 is input to the OR circuit 103. Further, the output of the OR circuit 10.2 is supplied directly or indirectly as a signal for driving the electromagnetic valve via the NOT circuit 10t.

Here, when the plant is started up (A No. S/ is given, the signal S/ is OR circuit 10/, 10.2
A command is given to open the solenoid valve via , driving air is sent to pressure reducing valve ♂, and valve r opens. At this time, start up (iu S
Although i is only given for a very short time, the 5 timer 103 holds the output of the OR circuit/θl for a certain period of time. That is, the time period during which the pressure reducing valve r is open is controlled by the timer 103. This time is set in advance by the diameter of the pressure reducing valve r, the time during which the fuel source pressure regulating valve 3 and the fuel stop valve are operated.

In this way, when the activation signal S/ is generated, the pressure reducing valve 1 is always opened for a certain period of time, and the fuel pressure can be lowered to a normal value or less.

On the other hand, if the operator wants to open the pressure reducing valve at any time judging from the instruments, he can turn the pressure reducing valve In other words, the Be/to starter No. S commands the OR circuit IO Hiroshi to open the solenoid valve via 10λ, opens the pressure reducing valve ♂, and also vents (the e No. s3 opens the OR circuit). Circuit 101, 10 pieces and knot times 1
3106, the solenoid valve is commanded to close the pressure reducing valve l.

Figure 1 shows the embodiment of this invention.
A fuel pressure detection device l/ is installed in the heavy duty system λ, and this device/
/〃・The pressure signal S from fltl is input to the control device.

In FIG. It may be provided either way.

This detection device/l includes, for example, a pressure transmitter that continuously detects pressure, a pressure switch that detects set pressure, and the like.

In addition, the configuration of the control device in this embodiment is as shown in FIG.
Ko, 3 OR circuits + J, IAA, Hiroshi 71. Two wired OR circuits phantom, '/-g, and λ knot circuits, consisting of a lip, starting signal S/ and pressure chi, No. 1 S Hiroshi, Alternatively, it is driven by the vent start signal S2 and the vent end signal S3.

Here, when the start signal S/ is given 7"L with the start-up of the plant, the signal S/ is also input to the AND circuit Hiroko, but the pressure signal which is the other input of this circuit Hiroyu The AND circuit≠2 sends out an output only when 84' is at a high level.In other words, the pressure signal S is asserted only when the pressure detected by the fuel pressure detection device [4'/ is greater than the set value. Therefore, only in this case, a command to open the solenoid valve is given via the OR circuit !-3, 114. At this time, the signal is self-maintained by the action of the OR circuit, and the pressure reducing valve r is maintained in the open state. .This self-holding is canceled when the fuel pressure falls below the set value, pressure control No. 8 B becomes low level, and the solenoid valve goes to the blow position and the pressure reducing valve l is released.
is commanded to close.

'-1: Similarly to the embodiment shown in FIG. 1 explained in FIG. The pressure reducing valve can be opened and closed.

In each of the above embodiments, the pressure valve r was explained as an air-operated valve, but it is of course possible to use an electric valve. This will directly drive the electric valve.

〔Effect of the invention〕

This invention achieves this by providing a pressure reduction system as described above.
It is possible to provide a fuel pressure control device that can constantly maintain fuel pressure below a normal value and can be expected to improve plant safety and controllability.

[Brief explanation of drawings]

Fig. 1 is a system diagram of a conventional device, Fig. 2 is a +iQ diagram of the first embodiment of the present invention, and Fig. 3 is a system diagram for explaining the control system of the embodiment of Fig. 2. Fig. 1 is a block diagram of a second embodiment of the present invention, and Fig. 5 is a system diagram for explaining the control system of the embodiment of Fig. 1.・Piping system, 3...fuel source pressure 5-section valve, ri...fuel stop valve,! ...Fuel control valve, 6...Combustor, 7...Pressure reducing pipe, r...Pressure reducing valve, 7...Solenoid valve, 10. l/-0...control device.

Claims (1)

[Scope of Claims] / A fuel source control valve that controls the overall fuel supply in a piping system from a fuel supply device that stores fuel to a combustor that burns the fuel, and when an abnormality occurs in the plant. In the fuel pressure control device, the fuel pressure control device includes a fuel stop valve for instantaneously stopping fuel supply to the combustor, and a fuel control valve for controlling the fuel flow rate from the fuel supply device to the combustor based on a control signal of a plant. A fuel pressure control device comprising a pressure reducing valve and a control device for the pressure reducing valve to control the pressure of a piping system between a fuel source pressure regulating valve and the fuel stop valve. 2. The fuel pressure control device according to claim 1, wherein the pressure reducing valve is driven by the control device so as to open for a certain period of time as the plant is started up. 3. In the apparatus according to claim 1, the pressure reduction is performed by detecting at the time of startup of the plant that the pressure in the piping system between the fuel source pressure control valve and the fuel stop valve is higher than a predetermined value. A fuel pressure control device configured to be driven by the control device to open a valve.