Aero-derivative gas turbine fuel solenoid valve safety control circuit and gas turbine generator

Abstract

The present invention provides an aeroderivative gas turbine fuel solenoid valve safety control circuit and a gas turbine generator, comprising: a solenoid valve coil, a surge protector, an electronic switch unit, a circuit control system input dry contact, a controller, and a control power supply; the positive pole of the solenoid valve coil is respectively connected to one end of the surge protector, one end of the circuit control system input dry contact, and the positive pole of the control power supply; the negative pole of the solenoid valve coil is respectively connected to the other end of the surge protector, the first connection end of the electronic switch unit, and the second connection end of the electronic switch unit; and the third connection end of the electronic switch unit is connected to the negative pole of the control power supply. The present invention adds an electronic switch unit to the solenoid valve coil control circuit of the shutoff valve on the fuel pipeline of the aeroderivative gas turbine generator to detect the circuit status, thereby providing safety for the fuel valve control circuit.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel supply for gas engines, and in particular to a safety control circuit for a fuel solenoid valve of an aeroderivative gas engine and a gas turbine generator, and in particular to a safety control circuit for a fuel solenoid valve of an aeroderivative gas engine implemented by an electronic switch. Background Art

[0002] Existing technologies face the technical challenge of being unable to fully monitor the state of the solenoid valve circuit. Conventional solenoid valve coil automatic control circuit designs typically incorporate only a pair of control dry contacts to control the on / off power supply, but lack state feedback monitoring for the coil's on / off status. If the control system fails and cannot trigger the dry contact to switch states, the solenoid valve will not operate correctly. Furthermore, if the solenoid valve itself or its circuit malfunctions, the control system will be unable to detect the solenoid valve or circuit status feedback signal and will assume the solenoid valve has followed the control command and proceed to the next step. This can result in fuel failure or loss, leading to safety issues. Summary of the Invention

[0003] In view of the defects in the prior art, the purpose of the present invention is to provide an aeroderivative gas turbine fuel solenoid valve safety control circuit and a gas turbine generator.

[0004] According to the present invention, an aeroderivative gas turbine fuel solenoid valve safety control circuit includes: a solenoid valve coil, a surge protector, an electronic switch unit, a loop control system input dry contact, a controller, and a control power supply;

[0005] The positive pole of the solenoid valve coil is respectively connected to one end of the surge protector, one end of the input dry contact of the loop control system and the positive pole of the control power supply;

[0006] The negative pole of the solenoid valve coil is respectively connected to the other end of the surge protector, the first connection end of the electronic switch unit, and the second connection end of the electronic switch unit;

[0007] The third connection terminal of the electronic switch unit is connected to the negative electrode of the control power supply.

[0008] Preferably, the electronic switch unit includes a thyristor, a diode and a first voltage-dividing resistor;

[0009] The anode of the thyristor serves as the first connection terminal of the electronic switch unit, the cathode of the thyristor serves as the third connection terminal of the electronic switch unit, and the gate of the thyristor is connected to the cathode of the diode;

[0010] One end of the first voltage-dividing resistor serves as the second connection end of the electronic switch unit, and the other end of the first voltage-dividing resistor is connected to the anode of the diode.

[0011] Preferably, the electronic switch unit further includes a second voltage-dividing resistor;

[0012] One end of the second voltage-dividing resistor is connected to the cathode of the thyristor, and the other end of the second voltage-dividing resistor is connected to the cathode of the diode.

[0013] Preferably, the solenoid valve coil is a 24V DC solenoid valve coil.

[0014] Preferably, the control power supply is a 24V DC control power supply.

[0015] Preferably, the conduction conditions of the thyristor are: there is a forward voltage between the anode of the thyristor and the cathode of the thyristor; and the forward voltage between the gate of the thyristor and the cathode of the thyristor is greater than a trigger voltage threshold of the thyristor.

[0016] Preferably, the closing condition of the thyristor is: the voltage between the anode of the thyristor and the cathode of the thyristor is reduced to such an extent that the current passing through the thyristor is less than the holding current.

[0017] Preferably, the holding current of the thyristor is smaller than the normal current of the loop.

[0018] Preferably, when the thyristor is turned on, the solenoid valve coil operates normally;

[0019] When a circuit is disconnected or the solenoid valve coil fails, the thyristor is turned off, the thyristor cuts off the power supply circuit of the solenoid valve coil, and the solenoid valve coil is closed.

[0020] The present invention also provides a gas turbine generator, comprising the above-mentioned modified gas turbine fuel solenoid valve safety control circuit.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention utilizes the quick-break characteristic of SCR to quickly cut off the abnormal circuit within hundreds of microseconds;

[0023] 2. The present invention ensures that the circuit meets the thyristor gate trigger voltage requirement under normal circumstances by properly selecting the voltage divider resistor;

[0024] 3. By adding an electronic switch in the circuit, the present invention avoids to a great extent the malfunction of the solenoid valve caused by a control system failure, a solenoid valve failure, or a circuit failure, thereby achieving a safety function for the fuel shut-off valve coil power supply circuit. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Other features, objects and advantages of the present invention will become more apparent upon reading the detailed description of non-limiting embodiments with reference to the following drawings:

[0026] Figure 1 This is a schematic diagram of the structure of the safety control circuit of the fuel solenoid valve of an aeroderivative gas turbine of the present invention;

[0027] Figure 2 Schematic diagram of the structure of the electronic switch unit of the present invention.

[0028] The figure shows:

[0029] Solenoid valve coil 1 Control power supply 6

[0030] Surge protector 2 Thyristor 7

[0031] Electronic switch unit 3 diode 8

[0032] Input dry contact of control system 4 First voltage divider resistor 9

[0033] Controller 5 Second voltage divider resistor 10 DETAILED DESCRIPTION

[0034] The present invention will be described in detail below with reference to specific embodiments. The following examples will help those skilled in the art to further understand the present invention, but are not intended to limit the present invention in any form. It should be noted that, for those skilled in the art, several changes and improvements can be made without departing from the scope of the present invention. These all fall within the scope of protection of the present invention.

[0035] Example 1:

[0036] like Figures 1-2 As shown, this embodiment provides a safety control circuit for an aeroderivative fuel engine fuel solenoid valve, comprising: a solenoid valve coil 1, a surge protector 2, an electronic switch unit 3, a loop control system input dry contact 4, a controller 5, and a control power supply 6. The positive pole of the solenoid valve coil 1 is respectively connected to one end of the surge protector 2, one end of the loop control system input dry contact 4, and the positive pole of the control power supply 6, the negative pole of the solenoid valve coil 1 is respectively connected to the other end of the surge protector 2, the first connection end of the electronic switch unit 3, and the second connection end of the electronic switch unit 3, and the third connection end of the electronic switch unit 3 is connected to the negative pole of the control power supply 6.

[0037] In this embodiment, the solenoid valve coil 1 is a 24V DC solenoid valve coil, and the control power supply 6 is a 24V DC control power supply.

[0038] The electronic switch unit 3 includes a thyristor 7, a diode 8, and a first voltage-dividing resistor 9. The anode of the thyristor 7 serves as the first connection terminal of the electronic switch unit 3, the cathode of the thyristor 7 serves as the third connection terminal of the electronic switch unit 3, the gate of the thyristor 7 is connected to the cathode of the diode 8, one end of the first voltage-dividing resistor 9 serves as the second connection terminal of the electronic switch unit 3, and the other end of the first voltage-dividing resistor 9 is connected to the anode of the diode 8. The electronic switch unit 3 also includes a second voltage-dividing resistor 10, one end of which is connected to the cathode of the thyristor 7, and the other end of which is connected to the cathode of the diode 8.

[0039] The holding current of thyristor 7 is less than the normal current of the circuit. Holding current refers to the minimum current that can keep the thyristor in forward conduction. When the forward current is less than the holding current, the thyristor is naturally turned off.

[0040] When the thyristor 7 is turned on, the solenoid valve coil 1 operates normally; when the circuit is broken or the solenoid valve coil 1 fails, the thyristor 7 is turned off, the thyristor 7 cuts off the power supply circuit of the solenoid valve coil 1, and the solenoid valve coil 1 is closed.

[0041] The on-conditions for thyristor 7 are: a positive voltage exists between the anode and cathode of thyristor 7; and the forward voltage between the gate and cathode of thyristor 7 is greater than the trigger voltage threshold of thyristor 7. The off-condition for thyristor 7 is: the voltage between the anode and cathode of thyristor 7 decreases to a level that makes the current passing through thyristor 7 less than the holding current.

[0042] This embodiment also provides a gas turbine generator, including the above-mentioned modified gas turbine fuel solenoid valve safety control circuit.

[0043] This embodiment adds an electronic switch unit to the solenoid valve coil control circuit of the shutoff valve on the fuel pipeline of an aeroderivative gas turbine generator to detect the circuit's status. This electronic switch unit can confirm whether current is flowing through the solenoid valve coil during turbine operation. If an abnormal current is detected, the electronic switch immediately disconnects the coil power supply circuit, closes the solenoid valve, and immediately stops fuel supply to the turbine. This prevents the gas turbine from failing to close the solenoid valve due to a control system malfunction or power failure, resulting in continued fuel flow into the pipeline and re-ignition. This provides a safety feature for the fuel valve control circuit.

[0044] Example 2:

[0045] Those skilled in the art may understand this embodiment as a more specific description of Embodiment 1.

[0046] This embodiment provides a safety control circuit for an aeroderivative fuel engine fuel solenoid valve, comprising: a 24V DC solenoid valve coil SOV, a surge protector Z, an electronic switch unit A1, a control system input dry contact K1, a controller 5, and a 24V DC control power supply 6.

[0047] like Figure 1 As shown in FIG, an electronic switch unit A1 is added to the negative end of the 24V DC power supply 6 of the conventional solenoid valve control circuit. The switch detects the current at the negative end of the solenoid valve coil SOV to determine whether the circuit is normal. If an abnormal current is detected at the negative end, the switch will serve as a breakpoint in the circuit and cut off the 24V power supply circuit of the solenoid valve coil SOV.

[0048] Electronic switch circuit composition Figure 2 As shown, it includes a thyristor SCR, a diode D1, a voltage dividing resistor R1, a voltage dividing resistor R2 and three connection terminals, with terminal numbers 1, 2 and 4 respectively.

[0049] like Figure 1 As shown, the anode A of the thyristor SCR is connected to the negative end of the solenoid valve coil SOV through the terminal 4 of the electronic switch unit A1. The negative end is also connected to the gate G of the thyristor SCR through the terminal 2 of the electronic switch unit A1, the voltage divider resistor R1 and the diode D1 in series, and the cathode K of the thyristor SCR is connected to the negative end of the 24V DC control power supply 6 through the terminal 1.

[0050] Working principle of the circuit:

[0051] The function of this circuit fully utilizes the working characteristics and on / off conditions of the thyristor SCR:

[0052] The conduction conditions of thyristor SCR:

[0053] a. Apply a forward voltage between anode A and cathode K;

[0054] b. The forward voltage applied between the gate G and the cathode K is greater than the trigger voltage threshold;

[0055] Turn-off conditions of the turned-on thyristor SCR:

[0056] a. Reduce the voltage between the anode and cathode so that the current passing through the thyristor is less than the holding current.

[0057] Under normal circumstances, Figure 1 The control system input contact K1 in the loop is closed, the electronic switch unit A1 is turned on, and the 24V DC current flows from the positive end of the power supply through the control system input contact K1, the solenoid valve coil SOV, the anode and cathode of the thyristor SCR, and then returns to the negative end of the power supply.

[0058] In summary, combined with the internal resistance of the solenoid valve coil SOV, considering the resistance of the voltage divider resistor R1 and the voltage divider resistor R2, select a suitable thyristor SCR to ensure that when the circuit is normal, the voltage value U between the gate and cathode of the thyristor SCR is GK It is greater than the trigger threshold voltage of the thyristor SCR, so that the thyristor SCR works in the on state.

[0059] Assuming the internal resistance of the solenoid valve coil is 100Ω, the voltage divider resistor R1 is 300Ω, and the voltage divider resistor R2 is 1000Ω, the voltage applied between the gate and cathode of the thyristor SCR is:

[0060] U GK =U*R2 / (100+R1+R2)=24*1000 / (100+300+1000)=17(V)

[0061] Select a suitable type of thyristor SCR, such as C231D, so that its trigger voltage threshold is less than the upper value.

[0062] When the loop current is lower than the holding current I of the thyristor SCR H , the thyristor is turned off. Therefore, to avoid the above situation under normal circuit conditions, the holding current of the selected thyristor SCR must be smaller than the normal circuit current. After the thyristor SCR is turned on, the current passing through its anode and cathode is approximately:

[0063] I=24 / 100=240(mA)

[0064] Select a suitable type of thyristor SCR, such as C231D, so that its maintaining current value is less than the upper value.

[0065] When the above conditions are met and a suitable thyristor SCR is selected, under normal circumstances, the thyristor SCR is turned on and the solenoid valve coil is energized and operates normally.

[0066] When the circuit outgoing line is broken or the solenoid valve fails, the current flowing through the thyristor SCR will not be able to be maintained, causing the thyristor to turn off quickly, cutting off the solenoid valve power circuit and closing the solenoid valve.

[0067] The present invention adds an electronic switch unit to the solenoid valve coil control circuit of the shut-off valve on the fuel pipeline of the aeroderivative gas turbine generator to detect the circuit state, thereby playing a role in protecting the fuel valve control circuit.

[0068] In the description of this application, it should be understood that the terms "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0069] The above describes specific embodiments of the present invention. It should be understood that the present invention is not limited to the specific embodiments described above, and those skilled in the art may make various changes or modifications within the scope of the claims, which do not affect the essence of the present invention. The embodiments of this application and the features in the embodiments may be combined with each other in any manner unless there is a conflict.

Claims

1. A safety control circuit for fuel solenoid valve of an aeroderivative gas turbine, characterized in that: include: Solenoid valve coil (1), surge protector (2), electronic switch unit (3), loop control system input dry contact (4), controller (5) and control power supply (6); The positive electrode of the solenoid valve coil (1) is respectively connected to one end of the surge protector (2), one end of the loop control system input dry contact (4), and the positive electrode of the control power supply (6); The negative pole of the solenoid valve coil (1) is respectively connected to the other end of the surge protector (2), the first connection end of the electronic switch unit (3), and the second connection end of the electronic switch unit (3); The third connection terminal of the electronic switch unit (3) is connected to the negative electrode of the control power supply (6); The electronic switch unit (3) comprises a thyristor (7), a diode (8) and a first voltage-dividing resistor (9); The anode of the thyristor (7) serves as the first connection terminal of the electronic switch unit (3), the cathode of the thyristor (7) serves as the third connection terminal of the electronic switch unit (3), and the gate of the thyristor (7) is connected to the cathode of the diode (8); One end of the first voltage-dividing resistor (9) serves as the second connection end of the electronic switch unit (3), and the other end of the first voltage-dividing resistor (9) is connected to the anode of the diode (8); The electronic switch unit (3) further includes a second voltage-dividing resistor (10); One end of the second voltage-dividing resistor (10) is connected to the cathode of the thyristor (7), and the other end of the second voltage-dividing resistor (10) is connected to the cathode of the diode (8).

2. The aeroderivative gas turbine fuel solenoid valve safety control circuit according to claim 1 is characterized in that: The solenoid valve coil (1) is a 24V DC solenoid valve coil.

3. The aeroderivative gas turbine fuel solenoid valve safety control circuit according to claim 1, characterized in that: The control power supply (6) is a 24V DC control power supply.

4. The aeroderivative gas turbine fuel solenoid valve safety control circuit according to claim 1, characterized in that: The conduction conditions of the thyristor (7) are: a forward voltage is present between the anode of the thyristor (7) and the cathode of the thyristor (7); and a forward voltage between the gate of the thyristor (7) and the cathode of the thyristor (7) is greater than a trigger voltage threshold of the thyristor (7).

5. The aeroderivative gas turbine fuel solenoid valve safety control circuit according to claim 4, characterized in that: The closing condition of the thyristor (7) is that the voltage between the anode of the thyristor (7) and the cathode of the thyristor (7) is reduced to such an extent that the current passing through the thyristor (7) is less than the holding current.

6. The aeroderivative gas turbine fuel solenoid valve safety control circuit according to claim 1, characterized in that: The holding current of the thyristor (7) is less than the normal current of the loop.

7. The aeroderivative gas turbine fuel solenoid valve safety control circuit according to claim 5, characterized in that: When the thyristor (7) is turned on, the solenoid valve coil (1) operates normally; When a circuit is disconnected or the solenoid valve coil (1) fails, the thyristor (7) is turned off, the thyristor (7) cuts off the power supply circuit of the solenoid valve coil (1), and the solenoid valve coil (1) is closed.

8. A gas turbine generator, characterized in that: The invention comprises the safety control circuit of the modified fuel solenoid valve of a combustion engine as claimed in any one of claims 1 to 7.

Images