A real-time monitoring device and method for air supplement quantity of a Francis turbine unit in a hydropower plant

Abstract

The application provides a real-time monitoring device and method for air supplement amount of a Francis turbine unit of a hydropower plant, and relates to the field of Francis turbine units of hydropower plants.The device comprises a thermistor, an air supplement pipe, a current generator, a thermistor temperature sensor, a current regulator and a wind speed regulator, wherein the thermistor is fixed in the middle of the air supplement pipe, and the current generator generates rated voltage to heat the thermistor; the current regulator is used for real-time measurement of output current of the thermistor and records the change frequency of the output current; the wind speed regulator is used for measurement of wind speed at the air supplement pipe opening; and the thermistor temperature sensor is used for measurement of the temperature of the thermistor. The application fixes the thermistor in the air supplement pipe, determines the relationship curve between the air supplement amount and the output current, solves the problem that the air supplement amount of the Francis turbine unit cannot be monitored, and uses the thermistor principle to realize accurate measurement, is durable and not easy to be damaged, is convenient to install, can be introduced into a monitoring system, and can be monitored in real time on a host computer.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of Francis turbine units in hydropower plants, and particularly relates to a real-time monitoring device and method for air supplementing quantity of Francis turbine units in hydropower plants. BACKGROUND

[0002] At present, in the production process of hydropower plants, air is generally supplemented into the tail water cone pipe to weaken the vortex vacuum, reduce the vortex intensity, improve the unit operation condition, and reduce the vibration of the unit parts, shaft swing, pressure pulsation in the spiral case and steel pipe, load fluctuation and other phenomena. The air supplementing valve is composed of an air supplementing valve and an air supplementing pipe. When the air supplementing quantity of the air supplementing valve is insufficient or the action is unreasonable, the effect of improving the unit operation condition will be greatly weakened.

[0003] At present, there is a lack of a device for real-time monitoring of the air supplementing condition, and the action of the air supplementing valve and the air supplementing quantity cannot be collected, so that the subsequent adjustment of the air supplementing valve will lack operation data support. SUMMARY

[0004] In view of the problem that the air supplementing quantity of Francis turbine units in hydropower plants cannot be quantitatively monitored, the application provides a real-time monitoring device and method for air supplementing quantity of Francis turbine units in hydropower plants, which can monitor the air inlet quantity and the action frequency of the air supplementing valve in real time.

[0005] The application adopts the following technical solutions to achieve the above-mentioned technical effects:

[0006] The application provides a real-time monitoring device for air supplementing quantity of Francis turbine units in hydropower plants, which comprises a thermistor, an air supplementing pipe, a current generator, a thermistor temperature sensor, a current regulator and a wind speed regulator, wherein,

[0007] The thermistor is fixed in the middle of the air supplementing pipe, and the current generator generates rated voltage to heat the thermistor;

[0008] The current regulator is used to measure the output current of the thermistor in real time and record the change frequency of the output current;

[0009] The wind speed regulator is used to measure the wind speed of the air supplementing pipe.

[0010] The thermistor temperature sensor is used to measure the temperature of the thermistor.

[0011] Optionally, the thermistor is made of platinum metal, the diameter of the air supplementing pipe is 300 mm, and the thermistor is fixed on the pipe opening of the air supplementing pipe by buckles at both ends.

[0012] Optionally, the input rated voltage of the current generator is 9V.

[0013] Optionally, the current regulator further comprises an ammeter, a pulse circuit and a time sequence logic counter, wherein,

[0014] The ammeter is configured to measure the output current of the thermistor in real time.

[0015] The pulse circuit is composed of a resistor-capacitor-triggered diode, and is configured to convert the output current change generated each time the water turbine air supply valve acts into a single pulse.

[0016] The time sequence logic counter is configured to count the single pulse and record the number of air supply actions.

[0017] Optionally, the output current varies between 0-20 mA.

[0018] The second aspect of the present application provides a method applied to the device of any one of the first aspect, comprising:

[0019] fixing the thermistor in the middle of the air supply pipe, heating the thermistor, and recording the wind speed of the air supply pipe opening and the output current of the thermistor in real time;

[0020] calculating the air supply amount according to the wind speed of the air supply pipe opening and the cross-sectional area of the air supply pipe opening;

[0021] obtaining the relationship curve of the air supply amount and the output current through the air supply amount and the output current.

[0022] Optionally, after obtaining the relationship curve, inputting the output current measured in the subsequent process into the relationship curve to realize real-time measurement of the air supply amount when the water turbine air supply valve acts.

[0023] Optionally, calculating the air supply amount according to the wind speed of the air supply pipe opening and the cross-sectional area of the air supply pipe opening comprises:

[0024] Q = V × F × T,

[0025] wherein Q is the air supply amount, V is the wind speed of the air supply pipe opening, F is the cross-sectional area of the air supply pipe opening, and T is the air supply time.

[0026] The third aspect of the present application provides a computer device, comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor executes the computer program to realize the device of any one of the first aspect.

[0027] The fourth aspect of the present application provides a non-transitory computer readable storage medium having a computer program stored thereon, wherein the computer program is executable by a processor to realize the device of any one of the first aspect.

[0028] The beneficial effects of the present application are as follows:

[0029] By fixing the thermistor in the air supplementing pipe, the relationship curve between the air supplementing amount and the output current is determined, the problem that the air supplementing amount of the Francis turbine unit cannot be monitored is solved, the thermistor type principle is used for accurate measurement, it is durable and not easy to be damaged, installation is convenient, a monitoring system can be introduced subsequently, and real-time monitoring can be realized on the host computer. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a framework diagram of a real-time air supplementing amount monitoring device for a Francis turbine unit of a hydropower plant proposed in the present application;

[0031] Figure 2 is a flowchart of a real-time air supplementing amount monitoring method for a Francis turbine unit of a hydropower plant proposed in the present application;

[0032] Figure 3 is a block diagram of an electronic device. DETAILED DESCRIPTION

[0033] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings. The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as a limitation of the present application.

[0034] As shown in Figure 1 the device proposed in the present application includes a thermistor, an air supplementing pipe, a current generator, a thermistor temperature sensor, a current regulator and a wind speed regulator, wherein,

[0035] The thermistor is fixed in the middle of the air supplementing pipe, and the current generator generates a rated voltage to heat the thermistor.

[0036] In the embodiments of the present application, the thermistor is made of platinum metal, the large shaft air supplementing pipe has a pipe diameter of 300 mm, the thermistor is fixed on the pipe opening of the air supplementing pipe through buckles at both ends, and the input rated voltage of the current generator is 9V.

[0037] The purpose of heating is to heat the thermistor by the current generator to generate a rated voltage, so that the temperature of the thermistor is higher than the air temperature. When the air supplementing valve is actuated to supplement air, the air flows through the thermistor in the vertical direction, and the flowing air will take away the heat of the thermistor, so that the temperature of the thermistor decreases, causing the output current of the thermistor to change.

[0038] The current regulator is used to measure the output current of the thermistor in real time, and record the number of changes of the output current.

[0039] The current regulator further includes an ammeter, a pulse circuit and a time sequence logic counter, wherein,

[0040] An ammeter is used to measure the output current of the thermistor in real time;

[0041] The pulse circuit is composed of a resistance-capacitance-triggering diode, which is used to convert the output current change generated by the water turbine air supply valve into a single pulse.

[0042] The timing logic counter is used to count the single pulse and record the number of air supply actions.

[0043] In the embodiments of the present application, the output current size and the timing logic counter count are output to the LED display or computer for detailed recording, so as to generate a relationship curve, wherein the output current size varies between 0-20mA.

[0044] The wind speed regulator is used to measure the wind speed of the air supply pipe mouth.

[0045] In the embodiments of the present application, the wind speed regulator is a wind cup type standard anemometer, which can monitor the wind speed of the air supply pipe mouth in real time.

[0046] The thermistor temperature sensor is used to measure the temperature of the thermistor, and the output resistance temperature can be used as the compensation of the thermistor.

[0047] Figure 2 is a flow chart of a real-time air supply amount monitoring method for a Francis turbine unit in a hydropower plant proposed in the present application, which comprises;

[0048] Step 201, fixing the thermistor in the middle of the air supply pipe and heating the thermistor, and recording the wind speed of the air supply pipe mouth and the output current of the thermistor in real time;

[0049] Step 202, calculating the air supply amount according to the wind speed of the air supply pipe mouth and the cross-sectional area of the air supply pipe mouth;

[0050] Step 203, obtaining the relationship curve between the air supply amount and the output current through the air supply amount and the output current.

[0051] In the embodiments of the present application, after obtaining the relationship curve, the output current measured in the subsequent process is input to the relationship curve, so as to realize the real-time measurement of the air supply amount when the water turbine air supply valve acts.

[0052] In addition, the air supply amount is calculated according to the wind speed of the air supply pipe mouth and the cross-sectional area of the air supply pipe mouth by the following formula:

[0053] Q=VxFxT,

[0054] Wherein, Q is the air supply amount, V is the wind speed of the air supply pipe mouth, F is the cross-sectional area of the air supply pipe mouth, and T is the air supply time.

[0055] The embodiment of the application determines the air supplement amount and output current relationship curve by fixing the thermistor in the air supplement pipe, monitors the air intake amount of the air supplement into the tail water pipe and the air supplement valve action frequency in real time, solves the problem that the air supplement amount of the mixed flow type water turbine set cannot be monitored, and is accurate, durable and not easy to be damaged by using the thermistor type principle to measure, is convenient to install, can be introduced into a monitoring system, and can be monitored in real time on a host computer.

[0056] Figure 3 A schematic block diagram of an example electronic device 300 that can be used to implement embodiments of the present disclosure is shown. The electronic device is intended to represent various forms of digital computers, such as laptops, desktops, tablets, personal digital assistants, servers, blade servers, mainframes, and other appropriate computers. The electronic device can also represent various forms of mobile devices, such as personal digital processors, cellular telephones, smart phones, wearable devices, and other similar computing devices. The components shown here, their connections and relationships, and their functions, are meant to be examples only, and are not meant to limit implementations of the present disclosure described and / or claimed in this document.

[0057] As shown in Figure 3 The electronic device 300 includes a computing unit 301 that can perform various appropriate actions and processes in accordance with a computer program stored in a read-only memory (ROM) 302 or a computer program loaded from a storage unit 303 into a random access memory (RAM) 303. Various programs and data required for the operation of the electronic device 300 can also be stored in the RAM 303. The computing unit 301, the ROM 302, and the RAM 303 are connected to each other through a bus 304. An input / output (I / O) interface 305 is also connected to the bus 304.

[0058] Various components in the electronic device 300 are connected to the I / O interface 305, including an input unit 306, such as a keyboard, a mouse, etc., an output unit 307, such as various types of displays, a speaker, etc., a storage unit 308, such as a magnetic disk, an optical disk, etc., and a communication unit 309, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 309 allows the electronic device 300 to exchange information / data with other devices through a computer network, such as the Internet, and / or various telecommunication networks.

[0059] The computing unit 301 can be various general and / or special purpose processing components with processing and computing capabilities. Some examples of the computing unit 301 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various computing units running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The computing unit 301 performs various methods and processes described above, such as the voice instruction response method. For example, in some embodiments, the voice instruction response method can be implemented as a computer software program tangibly embodied in a machine-readable medium, such as the storage unit 308. In some embodiments, part or all of the computer program can be loaded and / or installed onto the device 300 via the ROM 302 and / or the communication unit 309. When the computer program is loaded onto the RAM 303 and executed by the computing unit 301, one or more steps of the voice instruction response method described above can be performed. Alternatively, in other embodiments, the computing unit 301 can be configured to perform the voice instruction response method by any other appropriate means, such as by means of firmware.

[0060] Various implementations of the systems and techniques described above can be realized in digital electronic circuitry, integrated circuitry, a field programmable gate array (FPGA), an application specific integrated circuit (ASIC), a system on a chip (SOC), a programmable logic device (PLD), a computer hardware, firmware, software, and / or combinations thereof. These various implementations can include implementation in one or more computer programs that are executable and / or interpretable on a programmable system including at least one programmable processor, which can be special or general purpose, coupled to receive data and instructions from, and to transmit data and instructions to, a storage system, at least one input device, and at least one output device.

[0061] Program code for carrying out methods of the present disclosure can be written in any combination of one or more programming languages. The program code can be provided to a processor or controller of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the program code, when executed by the processor or controller, produces the functions / operations specified in the flowcharts and / or the block diagrams. The program code can be executed entirely on a machine, partially on a machine, partially on a machine as a stand-alone software package, partially on a machine and partially on a remote machine or entirely on a remote machine or server.

[0062] In the context of this disclosure, a machine-readable medium can be a tangible medium that contains or stores a program for use by or in connection with an instruction execution system, apparatus, or device. The machine-readable medium can be a machine-readable signal medium or a machine-readable storage medium. A machine-readable medium can include but is not limited to an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or any suitable combination of the foregoing. More specific examples of the machine-readable storage medium will include one or more lines of electrical connections, portable computer disks, hard disk drives, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or Flash memory), optical fibers, portable compact disc read-only memories (CD-ROMs), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0063] To provide for interaction with a user, the systems and techniques described here can be implemented on a computer having a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user and a keyboard and a pointing device (e.g., a mouse or a trackball) by which the user can provide input to the computer. Other kinds of devices can be used to provide for interaction with a user as well; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form, including acoustic, speech, or tactile input.

[0064] The systems and techniques described here can be implemented in a computing system that includes a back end component (e.g., as a data server), or that includes a middleware component (e.g., an application server), or that includes a front end component (e.g., a user computer having a graphical user interface or a Web browser through which a user can interact with an implementation of the systems and techniques described here), or any combination of such back end, middleware, or front end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include a local area network (LAN), a wide area network (WAN), the Internet, and a blockchain network.

[0065] The computer system can include clients and servers. This description and the accompanying drawings should not be taken as

[0066] It should be understood that the various forms of flow shown in the above can be reordered, added, or deleted steps. For example, each step described in the present disclosure can be executed in parallel, sequentially, or in a different order, as long as the desired results of the technical solutions of the present disclosure can be achieved, which is not limited herein.

[0067] The above detailed description does not constitute a limitation on the protection scope of the present disclosure. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure.

[0068] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0069] In addition, the terms "first", "second" are only for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the technical features indicated. Therefore, the features defined with "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise explicitly and specifically limited.

[0070] In this application, unless otherwise clearly indicated and limited, the terms "mounting", "connection", "connecting", "fixed", and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection or communication with each other; can be directly connected, can also be indirectly connected through an intermediate medium, can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise clearly limited. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0071] In this application, unless otherwise clearly indicated and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "over" and "on" the second feature can be directly above or obliquely above the first feature, or only indicate that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "under" and "under" the second feature can be directly below or obliquely below the first feature, or only indicate that the horizontal height of the first feature is less than that of the second feature.

[0072] In this application, the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" and the like mean that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any appropriate manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine the different embodiments or examples described in the specification and the features of the different embodiments or examples without contradiction.

[0073] Although the above embodiments have been shown and described, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the application, and the changes, modifications, replacements and variations of the above embodiments made by those skilled in the art are within the protection scope of the application.

Claims

1. A method for real-time monitoring of air supply volume in a mixed-flow turbine unit of a hydropower plant, characterized in that, The real-time monitoring device for the air supply of the mixed-flow turbine unit in the hydropower plant includes a thermistor, an air supply pipe, a current generator, a thermistor temperature sensor, a current regulator, and a wind speed regulator. The thermistor is fixed in the middle of the gas supply pipe, and the current generator generates a rated voltage to heat the thermistor. The current regulator is used to measure the output current of the thermistor in real time and record the number of changes in the output current; The wind speed regulator is used to measure the wind speed at the air supply inlet; The thermistor temperature sensor is used to measure the temperature of the thermistor; The current regulator further includes an ammeter, a pulse circuit, and a timing logic counter, wherein, The ammeter is used to measure the output current of the thermistor in real time. The pulse circuit consists of resistors, capacitors, and diodes, and is used to convert the output current change generated each time the turbine air supply valve is activated into a single pulse. The timing logic counter is used to count the single pulse and record the number of air replenishment actions; The method includes: A thermistor is fixed in the middle of the air supply pipe, and the thermistor is heated to record the wind speed at the air supply pipe inlet and the output current of the thermistor in real time. Calculate the air supply volume based on the wind speed at the air supply inlet and the cross-sectional area of ​​the air supply inlet; By comparing the air supply volume with the output current, a relationship curve between the air supply volume and the output current can be obtained. After obtaining the relationship curve, the output current measured in subsequent processes is input to the relationship curve to realize the real-time measurement of the air supply volume when the turbine air supply valve is activated. The air supply volume is calculated based on the wind speed at the air supply inlet and the cross-sectional area of ​​the air supply inlet, including: Q = V × F × T, Where Q is the air supply volume, V is the wind speed at the air supply inlet, F is the cross-sectional area of ​​the air supply inlet, and T is the air supply time.

2. The method according to claim 1, characterized in that, The thermistor is made of platinum metal, the gas supply pipe has a diameter of 300mm, and the two ends of the thermistor are fixed to the opening of the gas supply pipe by clips.

3. The method according to claim 1, characterized in that, The rated input voltage of the current generator is 9V.

4. The method according to claim 1, characterized in that, The output current varies between 0 and 20 mA.

5. A computer device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, it implements the method as described in any one of claims 1-4.

6. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method as described in any one of claims 1-4.

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