A gas pressure regulating station flow measurement system and method

Abstract

The application provides a gas pressure regulating station flow measuring and calculating system and method, which comprises a valve position measuring device installed on a pressure regulator of the pressure regulating station and used for measuring the valve position opening degree of the pressure regulator, a first pressure sensor installed on an inlet pipeline of the pressure regulator and used for measuring the inlet pressure, a second pressure sensor installed on an outlet pipeline of the pressure regulator and used for measuring the outlet pressure, and a temperature sensor installed on the pipeline of the pressure regulator and used for measuring the temperature in the pipeline of the pressure regulator; the application has the following beneficial effects: the actual instantaneous flow of the pressure regulating station is obtained by calculating and revising the independent analog quantities of the inlet and outlet pressures, the temperature and the valve position on site, so the calculation of the actual instantaneous flow only needs to install the inlet and outlet pressure measuring sensors, the temperature measuring sensor and the valve position sensor, the overall installation is convenient, the flow monitoring of the pressure regulating station can be realized only by a small modification, the modification cost is low and the modification is convenient.

Description

Technical Field

[0001] This invention relates to the field of gas safety monitoring technology, and in particular to a gas pressure regulating station flow measurement system and method. Background Technology

[0002] With the improvement of residents' living standards (such as the installation of natural gas underfloor heating in homes), the demand for natural gas is increasing, causing pressure regulating stations to be unable to meet peak gas demand. Gas operators urgently need a device to measure the flow rate of pressure regulating stations. However, installing metering flow meters in pressure regulating stations that do not require metering is not only costly but also difficult to modify. For example, traditional flow meters are not only expensive but also require pipe modifications, which are difficult. Thermal flow meters are not only energy-intensive, but most pressure regulating stations do not have mains power. Therefore, there is an urgent need to design a pressure regulator flow monitoring technology based on the above requirements. This technology can quickly realize flow monitoring of pressure regulating stations, providing a basis for gas companies' operation and maintenance of pressure regulating stations. Summary of the Invention

[0003] In view of the shortcomings of the prior art described above, the purpose of this invention is to provide a gas pressure regulating station flow measurement system and method to solve the problem that the flow of the pressure regulating station cannot be accurately measured without the installation of an additional flow sensor in the prior art.

[0004] To achieve the above and other related objectives, the present invention provides the following technical solution:

[0005] A flow measurement system for a gas pressure regulating station includes a valve position measuring device installed on the pressure regulator of the pressure regulating station for measuring the valve opening degree of the pressure regulator. The valve position measuring device includes a connecting platform located inside the pressure regulator and connected to the valve stem of the pressure regulator. The side of the connecting platform away from the valve stem is a magnetic suction surface. A resistance sensor for measuring the valve opening degree of the pressure regulator is installed on the pressure regulator via a tee connector. The resistance sensor includes a magnet in contact with the magnetic suction surface and a return spring installed on the side of the magnet away from the magnetic suction surface.

[0006] In one embodiment of the present invention, the device further includes a first pressure sensor installed on the inlet pipe of the pressure regulator for measuring the inlet pressure, a second pressure sensor installed on the outlet pipe of the pressure regulator for measuring the outlet pressure, and a temperature sensor installed on the pipe of the pressure regulator for measuring the temperature inside the pipe of the pressure regulator.

[0007] In one embodiment of the present invention, a controller connected to the resistance ruler sensor is further included, and the controller is also connected to the first pressure sensor, the second pressure sensor, and the temperature sensor respectively.

[0008] A method for calculating the flow rate of a gas pressure regulating station, based on the aforementioned gas pressure regulating station flow rate calculation system and applied to a controller, the method includes the following steps: receiving the displacement of the regulator valve stem in real time from a resistance ruler sensor, and determining the valve opening degree of the regulator based on the displacement of the regulator valve stem;

[0009] The system receives real-time measurements of the inlet and outlet pressures of the pipeline, as well as the temperature inside the pipeline, from the first pressure sensor, the second pressure sensor, and the temperature sensor. It then substitutes the valve opening of the pressure regulator, along with the relevant inlet and outlet pressures and temperatures of the pipeline, into the theoretical flow rate calculation formula to obtain the theoretical instantaneous flow rate of the pressure regulator. Finally, it corrects the theoretical instantaneous flow rate of the pressure regulator to obtain the actual instantaneous flow rate of the pressure regulator.

[0010] In one embodiment of the present invention, determining the valve opening degree of the pressure regulator based on the displacement of the pressure regulator valve stem includes: determining the valve opening degree of the pressure regulator according to the following formula: ;in, The valve opening of the pressure regulator (1); The displacement of the pressure regulator valve stem is measured in real time by a resistance ruler sensor. This is the valve stem position recorded when the pressure regulator is fully open. This is the valve stem position recorded when the regulator is fully closed.

[0011] In one embodiment of the present invention, substituting the valve opening degree of the pressure regulator and the inlet pressure, outlet pressure, and temperature of the relevant pipeline into the theoretical flow calculation formula to obtain the theoretical instantaneous flow rate of the pressure regulator includes: calculating the theoretical instantaneous flow rate of the pressure regulator according to the following formula: ;in, This represents the theoretical instantaneous flow rate of the voltage regulator. For flow coefficient; The inlet pressure of the pipeline is measured in real time by the first pressure sensor; Atmospheric pressure; The relative density of the medium; The temperature inside the pipe is measured in real time by a temperature sensor; The shape factor; The outlet pressure of the pipeline is measured in real time by the second pressure sensor.

[0012] In one embodiment of the present invention, the step of correcting the theoretical instantaneous flow rate of the voltage regulator to obtain the actual instantaneous flow rate of the voltage regulator includes: the theoretical flow rate calculation formula... For the same type of pressure regulator, it is a fixed value, while the flow coefficient varies depending on the valve opening. The relationship between the value and the valve opening of the pressure regulator is non-linear; therefore, in specific corrections, the entire valve opening of the pressure regulator is divided into N parts, which can be considered as the value under each small segment of the opening. The coefficient is linear with the valve opening of the pressure regulator, which can be achieved through... The actual instantaneous flow rate of the voltage regulator is obtained by correcting the directly calculated instantaneous flow rate.

[0013] As described above, the gas pressure regulating station flow measurement system and method of the present invention have the following beneficial effects:

[0014] This invention calculates and modifies independent analog quantities such as inlet and outlet pressure, temperature, and valve position to obtain the actual instantaneous flow rate of the pressure regulating station. Therefore, the calculation of the actual instantaneous flow rate only requires the installation of inlet and outlet pressure measurement sensors, temperature measurement sensors, and valve position sensors. The overall installation is convenient, and only minimal modifications are needed to achieve flow monitoring of the pressure regulating station. The modification cost is low and the modification is convenient, without affecting the original performance of the pressure regulator. This solves the problem that adding metering flow meters to pressure regulating stations without metering requirements is not only costly but also difficult to modify. Attached Figure Description

[0015] Figure 1 This is a structural diagram of the gas pressure regulating station flow measurement system according to the first embodiment of the present invention;

[0016] Figure 2 The diagram shows the structure of the pressure regulator valve position measuring device in the gas pressure regulating station flow measurement system according to the first embodiment of the present invention.

[0017] Figure 3 The diagram shows the internal structure of the pressure regulator in the gas pressure regulating station flow measurement system according to the first embodiment of the present invention.

[0018] Figure 4 The diagram shows the structure of the pressure regulator and resistance sensor in the gas pressure regulating station flow measurement system according to the first embodiment of the present invention.

[0019] Figure 5 This is a flowchart illustrating the gas pressure regulating station flow measurement method in the second embodiment of the present invention.

[0020] Figure 6 This is a flowchart illustrating the overall flow calculation method for a gas pressure regulating station according to the second embodiment of the present invention.

[0021] Figure 7 The graph shows the flow characteristic curves of the stroke percentage X and Y values ​​in the gas pressure regulating station flow measurement method according to the second embodiment of the present invention.

[0022] Figure 8This is a diagram showing the final effect of the gas pressure regulating station flow measurement method in the second embodiment of the present invention.

[0023] Component designation explanation

[0024] 1. Pressure regulator; 11. Valve stem; 12. First housing; 13. Second housing; 14. Main diaphragm pressure plate; 2. Pressure regulator valve position measuring device; 21. Connecting platform; 22. T-joint; 23. Resistance ruler sensor; 231. Magnet; 232. Return spring; 3. Inlet pipe; 4. Outlet pipe; 5. First pressure sensor; 6. Second pressure sensor; 7. Temperature sensor; 8. Controller. Detailed Implementation

[0025] The following specific examples illustrate the implementation of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. It should be noted that, unless otherwise specified, the following embodiments and features described herein can be combined with each other.

[0026] The first embodiment of the present invention relates to a flow measurement system for a gas pressure regulating station. Please refer to [link / reference]. Figures 1 to 4 The device includes a valve position measuring device 2 installed on the pressure regulator 1 in the pressure regulating station and used to measure the valve position opening of the pressure regulator 1; the valve position measuring device 2 includes a connecting platform 21 located inside the pressure regulator 1 and connected to the valve stem 11 of the pressure regulator 1, the side of the connecting platform 21 away from the valve stem 11 is a magnetic suction surface, and a resistance ruler sensor 23 for measuring the valve position opening of the pressure regulator 1 is installed on the pressure regulator 1 through a three-way connector 22, the resistance ruler sensor 23 includes a magnet 231 in contact with the magnetic suction surface and a return spring 232 installed on the side of the magnet 231 away from the magnetic suction surface.

[0027] It also includes a first pressure sensor 5 installed on the inlet pipe 3 of the pressure regulator 1 for measuring the inlet pressure, a second pressure sensor 6 installed on the outlet pipe 4 of the pressure regulator 1 for measuring the outlet pressure, and a temperature sensor 7 installed on the pipe of the pressure regulator 1 for measuring the temperature inside the pipe of the pressure regulator 1; it also includes a controller 8 connected to the resistance ruler sensor 23, and the controller 8 is also connected to the first pressure sensor 5, the second pressure sensor 6 and the temperature sensor 7 respectively; wherein, the present invention has low overall power consumption, and the valve position measurement of the pressure regulator 1 can be realized by the controller 8 powered by a lithium battery.

[0028] It should be noted that the pressure regulator 1 in this embodiment includes a first housing 12, a second housing 13 mounted on the first housing 12, and a main diaphragm pressure plate 14 located inside the first housing 12. The valve stem 11 of the pressure regulator 1 can move up and down inside the first housing 12 and the second housing 13. The connecting platform 21 is located inside the first housing 12 and the second housing 13, and the connecting platform 21 is mounted above the main diaphragm pressure plate 14. The resistance ruler sensor 23 can be mounted on the second housing 13 through a three-way connector 22.

[0029] It should also be noted that the present invention designs a connecting platform 21 with a magnetic surface on the upper surface. The movement of the valve stem 11 drives the connecting platform 21 to move up and down. The resistance sensor 23 contacts the magnetic surface to measure the displacement of the valve stem 11. If the main diaphragm pressure plate 14 of the pressure regulator 1 is a magnetic surface, then an external magnetic platform is not required. One end of the resistance sensor 23 is a magnet 231. The magnet 231 and the connecting platform 21 are combined to form a magnetic platform, ensuring that the resistance sensor 23 will follow the up and down movement of the valve stem 11 without falling off. The resistance sensor 23 uses a weak elastic return spring 232 or no spring at all. A strong elastic spring acting on the connecting platform 21 for a long time will cause the platform to deform and affect the original pressure regulating performance of the pressure regulator 1. At the same time, a three-way connector 22 is designed to install the resistance sensor 23 through the breather hole of the pressure regulator 1.

[0030] The second embodiment of the present invention relates to a method for calculating the flow rate of a gas pressure regulating station, the process of which is as follows: Figure 5 As shown, the details are as follows:

[0031] Step 101: Receive the displacement of the regulator valve stem 11 measured in real time from the resistance ruler sensor 23, and determine the valve opening degree of the regulator 1 based on the displacement of the regulator valve stem 11.

[0032] Specifically, determining the valve opening degree of the pressure regulator 1 based on the displacement of the pressure regulator valve stem 11 includes: determining the valve opening degree of the pressure regulator 1 according to the following formula: ;in, This refers to the valve opening degree of pressure regulator 1; The displacement of the regulator valve stem 11 is measured in real time by the resistance ruler sensor 23. This is the valve stem position recorded when regulator 1 is fully open. This is the valve stem position recorded when regulator 1 is fully closed.

[0033] More specifically, in practical applications, the valve opening degree of pressure regulator 1 can be obtained by monitoring the valve stem position of pressure regulator 1.

[0034] The valve position conversion method is as follows: Regulator 1 is fully open, and the valve stem position is recorded. Pressure regulator 1 is fully closed; record the valve stem position as follows. When pressure regulator 1 is working, the valve stem position is measured in real time. Valve position opening .

[0035] Step 102: Receive real-time measurements of the inlet pressure, outlet pressure, and temperature inside the pipeline from the first pressure sensor 5, the second pressure sensor 6, and the temperature sensor 7.

[0036] Step 103: Substitute the valve opening of the pressure regulator 1 and the inlet pressure, outlet pressure and temperature of the relevant pipeline into the theoretical flow calculation formula to obtain the theoretical instantaneous flow of the pressure regulator 1.

[0037] Step 104: Correct the theoretical instantaneous flow rate of the voltage regulator 1 to obtain the actual instantaneous flow rate of the voltage regulator 1.

[0038] In practical applications, this invention calculates and modifies independent analog quantities such as inlet and outlet pressure, temperature, and valve position to obtain the instantaneous flow rate of the pressure regulating station. This invention allows for flow monitoring of the pressure regulating station with minimal modifications; for example... Figure 6 As shown, the data acquisition unit inside the controller 8 collects the inlet and outlet pressure, temperature and valve opening at the site, calculates the pressure regulator flow rate through formula calculation and data repair or AI calculation, and uploads it to the cloud for users to view through communication methods such as NB and 4G.

[0039] The theoretical basis for calculating the flow rate of a pressure regulator using inlet and outlet pressures, temperatures, and valve positions is as follows: The formula for calculating the flow rate of a pressure regulator is given in Formula D1 of Appendix D2.2 of the national standard GB27790-2020 "Urban Gas Pressure Regulators". The theoretical instantaneous flow rate of pressure regulator 1 is calculated using the following formula: (D1); where, This represents the theoretical instantaneous flow rate of regulator 1; For flow coefficient; The inlet pressure of the pipeline is measured in real time by the first pressure sensor 5; Atmospheric pressure; The relative density of the medium; The temperature inside the pipe is measured in real time by temperature sensor 7; The shape factor; The outlet pressure of the pipeline is measured in real time by the second pressure sensor 6;

[0040] In the above formula , , Sensors measure in real time. and For the same model of voltage regulator, there is a fixed value. As an adjustable coefficient, the default value is 1. For flow rates under different opening degrees, refer to formula D5: =Y (D5) The flow coefficient of regulator 1 at partial opening; For flow coefficient; Depend on Figure 7 The experimental curve was obtained. Figure 7 The X-axis represents the percentage of travel, and the Y-axis represents... / ×100%;

[0041] The flow characteristics of the pressure regulator 1 used in the pressure regulating station are shown as the solid line, which is a non-linear change. The above theoretical formula provides a theoretical basis for obtaining the instantaneous flow of the pressure regulating station by integrating independent analog quantities such as inlet and outlet pressure, temperature, and valve position. The pressure regulator flow rate derived by the model formula and AI data fitting in this invention meets the requirements of on-site monitoring.

[0042] 1. Formula Derivation: In the above theoretical formulas , , Sensors measure in real time. and For the same model of voltage regulator, it is a fixed value. As an adjustable coefficient, it defaults to 1, while the flow coefficient under partial opening is... The value is non-linear with the opening degree of the voltage regulator. Dividing the entire voltage regulator opening degree into N parts, we assume that under each small segment of the opening degree... The coefficient is linear with the regulator opening degree, which can be achieved through... The actual instantaneous flow rate is obtained by correcting the directly calculated instantaneous flow rate. Based on this principle, the a and b coefficients for each of the N opening intervals are obtained through experiments.

[0043] It should also be noted that for AI data fitting: the model library selected is extrapolation, also known as a regression algorithm. Extrapolation predicts the behavior of equipment under untested conditions by mapping the relationship between multiple variables. Collected sensor data includes regulator flow rate, inlet and outlet pressure, temperature, and valve position. A predictive model is trained to predict instantaneous flow rate under untested conditions. This model can be deployed on the edge or in the cloud; please refer to the final results. Figure 8 .

[0044] In summary, this invention has the following technical advantages: 1. Conventional flowmeters are difficult to retrofit, have high construction costs, and require redesigning the pressure regulating station pipeline. The actual instantaneous flow rate in this invention only requires the installation of inlet and outlet pressure measurement, temperature measurement, and valve position sensors, making installation convenient. 2. Inlet and outlet pressure, temperature, and valve position are important operating parameters for pressure regulating stations, which are crucial for the health monitoring and digitalization of these stations. The flow monitoring technology for pressure regulating stations upgrades and utilizes this measurement data, achieving flow monitoring without increasing costs, which is of great significance to gas operators. 3. Orifice flowmeters suffer from severe pressure loss at high flow rates, while this invention completely eliminates this pressure loss problem. 4. Thermal flowmeters measure flow rate through heated sensors, resulting in high power consumption and the inability to provide intermittent power. This invention not only has low operating power consumption but also further reduces standby power consumption through intermittent power supply and can be powered by lithium batteries, increasing product convenience.

[0045] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the invention. All equivalent modifications or alterations made by those skilled in the art without departing from the spirit and technical concept disclosed in this invention should still be covered by the claims of this invention.

Claims

1. A flow measurement system for a gas pressure regulating station, characterized in that: The device includes a valve position measuring device (2) installed on the regulator (1) of the pressure regulating station and used to measure the valve position opening of the regulator (1). The valve position measuring device (2) includes a connecting platform (21) located inside the regulator (1) and connected to the valve stem (11) of the regulator (1). The side of the connecting platform (21) away from the valve stem (11) is a magnetic attraction surface. A resistance ruler sensor (23) for measuring the valve position opening of the regulator (1) is installed on the regulator (1) through a three-way connector (22). The resistance ruler sensor (23) includes a magnet (231) in contact with the magnetic attraction surface and a return spring (232) installed on the side of the magnet (231) away from the magnetic attraction surface.

2. The gas pressure regulating station flow measurement system according to claim 1, characterized in that: It also includes a first pressure sensor (5) installed on the inlet pipe (3) of the pressure regulator (1) for measuring the inlet pressure, a second pressure sensor (6) installed on the outlet pipe (4) of the pressure regulator (1) for measuring the outlet pressure, and a temperature sensor (7) installed on the pipe of the pressure regulator (1) for measuring the temperature inside the pipe of the pressure regulator (1).

3. The gas pressure regulating station flow measurement system according to claim 2, characterized in that: It also includes a controller (8) connected to the resistance ruler sensor (23), and the controller (8) is also connected to the first pressure sensor (5), the second pressure sensor (6) and the temperature sensor (7) respectively.

4. A method for calculating the flow rate of a gas pressure regulating station, characterized in that: The gas pressure regulating station flow measurement system based on any one of claims 1 to 3, applied to the controller (8), comprises the following steps: The displacement of the regulator valve stem (11) is measured in real time by the resistance ruler sensor (23), and the valve opening of the regulator (1) is determined based on the displacement of the regulator valve stem (11). Receives real-time measurements of the inlet pressure, outlet pressure, and temperature inside the pipeline from the first pressure sensor (5), the second pressure sensor (6), and the temperature sensor (7); Substitute the valve opening of the pressure regulator (1) and the inlet pressure, outlet pressure and temperature of the relevant pipeline into the theoretical flow calculation formula to obtain the theoretical instantaneous flow of the pressure regulator (1). The theoretical instantaneous flow rate of the voltage regulator (1) is corrected to obtain the actual instantaneous flow rate of the voltage regulator (1).

5. The method for calculating the flow rate of a gas pressure regulating station according to claim 4, characterized in that: The step of determining the valve opening degree of the pressure regulator (1) based on the displacement of the pressure regulator valve stem (11) includes: The valve opening of the pressure regulator (1) is determined according to the following formula: ； in, The valve opening of the pressure regulator (1); The displacement of the regulator valve stem (11) is measured in real time by the resistance ruler sensor (23); The valve stem position is recorded when the pressure regulator (1) is fully open. The valve stem position is recorded when the regulator (1) is fully closed.

6. The method for calculating the flow rate of a gas pressure regulating station according to claim 4, characterized in that: The theoretical instantaneous flow rate of the pressure regulator (1) is obtained by substituting the valve opening degree of the pressure regulator (1) and the inlet pressure, outlet pressure and temperature of the relevant pipeline into the theoretical flow rate calculation formula, including: The theoretical instantaneous flow rate of the voltage regulator (1) is calculated according to the following formula: ； in, The theoretical instantaneous flow rate of the voltage regulator (1); For flow coefficient; The inlet pressure of the pipeline is measured in real time by the first pressure sensor (5); Atmospheric pressure; The relative density of the medium; The temperature inside the pipe is measured in real time by the temperature sensor (7); The shape factor; The outlet pressure of the pipeline is measured in real time by the second pressure sensor (6).

7. The method for calculating the flow rate of a gas pressure regulating station according to claim 6, characterized in that: The step of correcting the theoretical instantaneous flow rate of the voltage regulator (1) to obtain the actual instantaneous flow rate of the voltage regulator (1) includes: The theoretical flow calculation formula For the same type of pressure regulator (1), it is a fixed value, while the flow coefficient at some valve openings is a fixed value. The value and the valve opening of the pressure regulator (1) are non-linear; therefore, in specific correction, the valve opening of the entire pressure regulator (1) is divided into N parts, and it can be considered that the opening of each small segment is... The coefficient is linear with the valve opening of the pressure regulator (1), which can be achieved through... The actual instantaneous flow rate of the regulator (1) is obtained by correcting the instantaneous flow rate obtained by direct calculation.

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