Gas turbine valve fault on-line monitoring system and method

Abstract

The invention discloses a gas turbine valve fault online monitoring system and method. The method comprises the following steps: judging according to a difference value between a detected feedback signal and a given value, and outputting an alarm signal or a shutdown signal according to a judgment result; judging according to the detected current of the servo valve, and outputting an alarm signal or a shutdown signal according to a judgment result; and executing corresponding operation according to the alarm signal or the shutdown signal. The method has the technical effects that an operator can be timely and effectively reminded of the fault condition of the valve, unit operation is stopped in emergency, and safe and reliable operation of the unit is guaranteed.

Description

Technical Field

[0001] The invention relates to the field of electronic technology applications, and in particular to a gas turbine valve fault online monitoring system and method. Background Art

[0002] Gas turbines have many advantages in the field of power generation. They are important core equipment for my country's energy development, major power equipment integrating many high-end design, materials, manufacturing and other technologies, and an important symbol of a country's scientific and technological level, military strength, and even comprehensive national strength.

[0003] During the start-up, operation and shutdown of the gas turbine, the control system automatically or the operator manually controls various valves to control the operating status of the gas turbine: control the fuel shut-off valve and the discharge valve to ensure the supply and cut-off of fuel; control the fuel pressure control valve to adjust the fuel supply pressure; control the fuel flow control valve to control the fuel amount; control the compressor inlet guide vane (IGV) to control the compressor pressure ratio and other parameters; control the exhaust valve to prevent the gas turbine from operating in surge conditions, etc. Once a key valve fails, such as a fuel valve malfunction, an exhaust valve malfunction, and an IGV malfunction, it may lead to a series of serious consequences such as overspeed, overheating, surge, and fire. Therefore, ensuring the reliability of gas turbine valves is crucial to the safe operation of gas turbines.

[0004] Ensuring the reliability of valves requires selection, commissioning, fault detection, maintenance and other aspects. However, the means of ensuring valve selection, commissioning and maintenance can only be used during the design and construction stage of the gas turbine or the shutdown and maintenance stage. During online operation, they cannot be implemented due to factors such as site conditions and personnel safety. Existing fault detection methods are mostly based on preliminary design or additional equipment, with high cost investment and the risk of false alarms and false trips. It is difficult to promote and apply them during online operation. Gas turbine valves are numerous and complex in type, and it is difficult for operating personnel to monitor the status of all valves in real time and detect faults in the first place.

[0005] With regard to the problem that the existing technology cannot effectively monitor and protect valve failures online during the operation of the gas turbine, no effective solution has been proposed so far. Summary of the invention

[0006] To solve the above technical problems, the embodiments of the present invention hope to provide a gas turbine valve fault online monitoring system and method, so as to at least solve the problem that the prior art cannot effectively monitor and protect valve faults online during the operation of the gas turbine.

[0007] The technical solution of the present invention is achieved in this way:

[0008] An embodiment of the present invention provides an online monitoring system for gas turbine valve faults, comprising: a valve position monitoring module, a valve servo current monitoring module and a control module, wherein the valve position monitoring module is used to make a judgment based on the difference between a detected feedback signal and a given value, and output an alarm signal or a shutdown signal based on the judgment result; the valve servo current monitoring module is used to make a judgment based on the detected servo valve current, and output an alarm signal or a shutdown signal based on the judgment result; the control module is connected to the valve position monitoring module and the valve servo current monitoring module, respectively, and is used to receive the output signals of the valve position monitoring module and the valve servo current monitoring module, and perform corresponding operations based on the output signals.

[0009] Optionally, the valve position monitoring module is also used to output an alarm signal after executing a first preset delay if the difference is greater than a preset alarm value interval; output an alarm signal if a feedback signal is detected to indicate bad quality; output a stop signal after executing a second preset delay if the absolute value of the difference is greater than a first preset stop value interval; output a stop signal if a feedback signal is detected to be greater than a second preset stop value interval and the valve is in an unenabled state.

[0010] Further, optionally, the preset alarm value interval is [0, 10]; the first preset delay is [0, 10]; the first preset shutdown value interval is [0, 5]; the second preset delay is [0, 5]; and the second preset shutdown value interval is [0, 5].

[0011] Optionally, the valve servo current monitoring module is also used to output an alarm signal if the valve feedback signal indicated by the servo valve current is of poor quality; if the servo valve current is greater than a third preset shutdown value interval and the valve is in an unenabled state, output a shutdown signal.

[0012] Further, optionally, the third preset shutdown value interval is [-50, -20].

[0013] An embodiment of the present invention provides a method for online monitoring of gas turbine valve faults, comprising: making a judgment based on the difference between a detected feedback signal and a given value, and outputting an alarm signal or a shutdown signal based on the judgment result; making a judgment based on a detected servo valve current, and outputting an alarm signal or a shutdown signal based on the judgment result; and performing corresponding operations based on the alarm signal or the shutdown signal.

[0014] Optionally, a judgment is made based on the difference between the detected feedback signal and a given value, and an alarm signal or a shutdown signal is output based on the judgment result, including: if the difference is greater than a preset alarm value interval, an alarm signal is output after executing a first preset delay; if the feedback signal is detected to indicate bad quality, an alarm signal is output; if the absolute value of the difference is greater than a first preset shutdown value interval, a shutdown signal is output after executing a second preset delay; if the feedback signal is detected to be greater than a second preset shutdown value interval and the valve is in an unenabled state, a shutdown signal is output.

[0015] Further, optionally, the preset alarm value interval is [0, 10]; the first preset delay is [0, 10]; the first preset shutdown value interval is [0, 5]; the second preset delay is [0, 5]; and the second preset shutdown value interval is [0, 5].

[0016] Optionally, a judgment is made based on the detected servo valve current, and an alarm signal or a shutdown signal is output based on the judgment result, including: if the valve feedback signal indicated by the servo valve current is of bad quality, an alarm signal is output; if the servo valve current is greater than a third preset shutdown value interval and the valve is in an unenabled state, a shutdown signal is output.

[0017] Further, optionally, the third preset shutdown value interval is [-50, -20].

[0018] The embodiment of the present invention provides a gas turbine valve fault online monitoring system and method, which makes a judgment based on the difference between a detected feedback signal and a given value, and outputs an alarm signal or a shutdown signal based on the judgment result; makes a judgment based on the detected servo valve current, and outputs an alarm signal or a shutdown signal based on the judgment result; and performs corresponding operations based on the alarm signal or the shutdown signal, thereby being able to promptly and effectively remind operating personnel of valve faults, and stop the unit operation in an emergency, thereby ensuring the technical effect of safe and reliable operation of the unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of this application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0020] Figure 1 A schematic diagram of a gas turbine valve fault online monitoring system provided by an embodiment of the present invention;

[0021] Figure 2 A control logic diagram of a valve position monitoring module in an online monitoring system for valve failure of a gas turbine provided by an embodiment of the present invention;

[0022] Figure 3A control logic diagram of a valve servo current monitoring module in an online monitoring system for valve faults of a gas turbine provided by an embodiment of the present invention;

[0023] Figure 4 A schematic flow chart of a method for online monitoring of a gas turbine valve failure provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0024] In order to enable those skilled in the art to better understand the scheme of the present invention, the technical scheme in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0025] It should be noted that the terms "first", "second" and the like in the specification, claims and drawings of the present invention are used to distinguish different objects rather than to limit a specific order.

[0026] It should also be noted that the following embodiments of the present invention may be executed separately, or in combination with each other, and the embodiments of the present invention do not impose any specific limitations on this.

[0027] The embodiment of the present invention provides a gas turbine valve fault online monitoring system. Figure 1 A schematic diagram of a gas turbine valve fault online monitoring system provided by an embodiment of the present invention; Figure 1 As shown, the gas turbine valve fault online monitoring system provided by the embodiment of the present application includes:

[0028] A valve position monitoring module 12, a valve servo current monitoring module 14 and a control module 16, wherein the valve position monitoring module 12 is used to make a judgment based on the difference between the detected feedback signal and the given value, and output an alarm signal or a shutdown signal based on the judgment result; the valve servo current monitoring module 14 is used to make a judgment based on the detected servo valve current, and output an alarm signal or a shutdown signal based on the judgment result; the control module 16 is respectively connected to the valve position monitoring module 12 and the valve servo current monitoring module 14, and is used to receive the output signals of the valve position monitoring module and the valve servo current monitoring module, and perform corresponding operations based on the output signals.

[0029] Optional, Figure 2 A control logic diagram of a valve position monitoring module in an online monitoring system for a gas turbine valve fault provided by an embodiment of the present invention; Figure 2As shown, the valve position monitoring module is also used to output an alarm signal after executing a first preset delay if the difference is greater than a preset alarm value interval; output an alarm signal if a feedback signal is detected to indicate bad quality; output a stop signal after executing a second preset delay if the absolute value of the difference is greater than a first preset stop value interval; output a stop signal if a feedback signal is detected to be greater than a second preset stop value interval and the valve is in an unenabled state.

[0030] Further, optionally, the preset alarm value interval is [0, 10]; the first preset delay is [0, 10]; the first preset shutdown value interval is [0, 5]; the second preset delay is [0, 5]; and the second preset shutdown value interval is [0, 5].

[0031] Specifically, in the embodiment of the present application, the system automatically detects the difference between the feedback and the given value (i.e., the difference between the feedback signal and the given value in the embodiment of the present application). If the absolute value of the difference is greater than the alarm value FA (i.e., the preset alarm value in the embodiment of the present application), an alarm signal is output after a delay, where FA∈[0,10], and the delay time (i.e., the first preset delay in the embodiment of the present application) is between 0 and 10; if the valve feedback signal (i.e., the feedback signal in the embodiment of the present application) is detected to be of bad quality, an alarm signal is output.

[0032] The system automatically detects the difference between the feedback and the given value. If the absolute value of the difference is greater than the stop value FT1 (i.e., the first preset stop value interval in the embodiment of the present application), a stop signal is output after a delay, wherein FT1∈[0,5], and the delay time (i.e., the second preset delay in the embodiment of the present application) is between 0 and 5; if it is detected that the valve feedback is greater than the stop value FT2 (i.e., the second preset stop value interval in the embodiment of the present application) and the valve is in the disabled state, a stop signal is output, wherein FT2∈[0,5].

[0033] No matter what kind of valve is used in the embodiment of the present application, there will inevitably be a certain delay from the given target opening to the valve action. During this period of time, the valve setting and feedback will inevitably be inconsistent. If the alarm or shutdown delay is not set, an alarm or shutdown will occur at the moment of action, which will be a false alarm.

[0034] Optional, Figure 3 A control logic diagram of a valve servo current monitoring module in a gas turbine valve fault online monitoring system provided by an embodiment of the present invention; Figure 3 As shown, the valve servo current monitoring module is also used to output an alarm signal if the valve feedback signal indicated by the servo valve current is of bad quality; if the servo valve current is greater than the third preset shutdown value interval and the valve is in an unenabled state, a shutdown signal is output.

[0035] Further, optionally, the third preset shutdown value interval is [-50, -20].

[0036] Specifically, in the embodiment of the present application, the system automatically detects the servo valve current, and if it detects that the valve feedback signal (ie, the valve feedback signal indicated by the servo valve current in the embodiment of the present application) is of bad quality, an alarm signal is output.

[0037] The system automatically detects the servo valve current. If the detected servo valve current is greater than the stop value CT2 (i.e., the third preset stop value interval in the embodiment of the present application) and the valve is in the disabled state, a stop signal is output, where CT2∈[-50,-20].

[0038] The embodiment of the present invention provides an online monitoring system for valve failure of a gas turbine, including a valve position monitoring module, which is used to make a judgment based on the difference between a detected feedback signal and a given value, and output an alarm signal or a shutdown signal based on the judgment result; a valve servo current monitoring module, which is used to make a judgment based on the detected servo valve current, and output an alarm signal or a shutdown signal based on the judgment result; and a control module, which is respectively connected to the valve position monitoring module and the valve servo current monitoring module, and is used to receive the output signals of the valve position monitoring module and the valve servo current monitoring module, and perform corresponding operations based on the output signals, so as to timely and effectively remind the operating personnel of the valve failure, and stop the unit operation in an emergency, thereby ensuring the technical effect of safe and reliable operation of the unit.

[0039] The embodiment of the present invention provides a method for online monitoring of gas turbine valve failure. Figure 4 A flow chart of a method for online monitoring of a gas turbine valve failure provided by an embodiment of the present invention; Figure 4 As shown, the gas turbine valve fault online monitoring method provided by the embodiment of the present application includes:

[0040] Step S402, making a judgment based on the difference between the detected feedback signal and the given value, and outputting an alarm signal or a shutdown signal according to the judgment result;

[0041] Optionally, in step S402, a judgment is made based on the difference between the detected feedback signal and a given value, and an alarm signal or a shutdown signal is output based on the judgment result, including: if the difference is greater than a preset alarm value interval, an alarm signal is output after executing a first preset delay; if the feedback signal is detected to indicate bad quality, an alarm signal is output; if the absolute value of the difference is greater than a first preset shutdown value interval, a shutdown signal is output after executing a second preset delay; if the feedback signal is detected to be greater than a second preset shutdown value interval and the valve is in an unenabled state, a shutdown signal is output.

[0042] Further, optionally, the preset alarm value interval is [0, 10]; the first preset delay is [0, 10]; the first preset shutdown value interval is [0, 5]; the second preset delay is [0, 5]; and the second preset shutdown value interval is [0, 5].

[0043] Step S404, making a judgment based on the detected servo valve current, and outputting an alarm signal or a shutdown signal according to the judgment result;

[0044] Optionally, in step S404, a judgment is made based on the detected servo valve current, and an alarm signal or a shutdown signal is output based on the judgment result, including: if the valve feedback signal indicated by the servo valve current is of bad quality, an alarm signal is output; if the servo valve current is greater than a third preset shutdown value interval and the valve is in an unenabled state, a shutdown signal is output.

[0045] Further, optionally, the third preset shutdown value interval is [-50, -20].

[0046] Step S406, executing corresponding operations according to the alarm signal or the shutdown signal.

[0047] In summary, in combination with step S402 to step S406, the gas turbine valve fault online monitoring method provided in the embodiment of the present application can be applied to Figure 1 In the gas turbine valve fault online monitoring system shown, the gas turbine valve fault online monitoring method provided by the embodiment of the present application can increase system safety without increasing additional investment. Actual operation proves that the mechanism is simple to build, has a low false alarm rate, and can effectively remind the operator of valve faults in a timely manner, and stop the unit operation in an emergency, ensuring the safe and reliable operation of the unit.

[0048] An embodiment of the present invention provides an online monitoring method for gas turbine valve failure, which makes a judgment based on the difference between a detected feedback signal and a given value, and outputs an alarm signal or a shutdown signal based on the judgment result; makes a judgment based on the detected servo valve current, and outputs an alarm signal or a shutdown signal based on the judgment result; and performs corresponding operations based on the alarm signal or the shutdown signal, thereby being able to promptly and effectively remind operating personnel of valve failures, and stop the unit operation in an emergency, thereby ensuring the technical effect of safe and reliable operation of the unit.

[0049] The above are only preferred embodiments of the present invention and are not intended to limit the protection scope of the present invention.

Claims

1. A gas turbine valve fault online monitoring system, characterized in that: include: Valve position monitoring module, valve servo current monitoring module and control module, wherein: The valve position monitoring module is used to make a judgment based on the difference between the detected feedback signal and the given value, and output an alarm signal or a shutdown signal according to the judgment result; The valve servo current monitoring module is used to make a judgment based on the detected servo valve current and output an alarm signal or a shutdown signal based on the judgment result; The control module is connected to the valve position monitoring module and the valve servo current monitoring module respectively, and is used to receive output signals of the valve position monitoring module and the valve servo current monitoring module, and perform corresponding operations according to the output signals.

2. The gas turbine valve fault online monitoring system according to claim 1, characterized in that: The valve position monitoring module is also used to output the alarm signal after executing a first preset delay if the difference is greater than a preset alarm value interval; output the alarm signal if it is detected that the feedback signal indicates bad quality; output the stop signal after executing a second preset delay if the absolute value of the difference is greater than a first preset stop value interval; output the stop signal if it is detected that the feedback signal is greater than a second preset stop value interval and the valve is in an unenabled state.

3. The gas turbine valve fault online monitoring system according to claim 2, characterized in that: The preset alarm value interval is [0, 10]; the first preset delay is [0, 10]; the first preset shutdown value interval is [0, 5]; the second preset delay is [0, 5]; the second preset shutdown value interval is [0, 5].

4. The gas turbine valve fault online monitoring system according to claim 1, characterized in that: The valve servo current monitoring module is also used to output the alarm signal if the valve feedback signal indicated by the servo valve current is of bad quality; if the servo valve current is greater than a third preset shutdown value interval and the valve is in an unenabled state, output the shutdown signal.

5. The gas turbine valve fault online monitoring system according to claim 4, characterized in that: The third preset shutdown value interval is [-50, -20].

6. A method for online monitoring of gas turbine valve failure, characterized in that: include: Make a judgment based on the difference between the detected feedback signal and the given value, and output an alarm signal or a shutdown signal based on the judgment result; Make a judgment based on the detected servo valve current, and output an alarm signal or a shutdown signal based on the judgment result; Execute corresponding operations according to the alarm signal or the shutdown signal.

7. The method for online monitoring of gas turbine valve failure according to claim 6, characterized in that: The step of judging based on the difference between the detected feedback signal and the given value and outputting an alarm signal or a shutdown signal according to the judging result comprises: If the difference is greater than the preset alarm value interval, outputting the alarm signal after executing a first preset delay; If it is detected that the feedback signal indicates bad quality, outputting the alarm signal; If the absolute value of the difference is greater than the first preset shutdown value interval, the shutdown signal is output after executing the second preset delay; If it is detected that the feedback signal is greater than the second preset shutdown value interval and the valve is in a disabled state, the shutdown signal is output.

8. The method for online monitoring of gas turbine valve failure according to claim 7, characterized in that: The preset alarm value interval is [0, 10]; the first preset delay is [0, 10]; the first preset shutdown value interval is [0, 5]; the second preset delay is [0, 5]; the second preset shutdown value interval is [0, 5].

9. The method for online monitoring of gas turbine valve failure according to claim 6, characterized in that: The step of judging according to the detected servo valve current and outputting an alarm signal or a shutdown signal according to the judgment result comprises: If the valve feedback signal indicated by the servo valve current is of bad quality, outputting the alarm signal; If the servo valve current is greater than the third preset shutdown value interval and the valve is in a disabled state, the shutdown signal is output.

10. The method for online monitoring of gas turbine valve failure according to claim 9, characterized in that: The third preset shutdown value interval is [-50, -20].

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