Natural gas station pressure regulating valve noise reduction spacing determination method and terminal

Abstract

The invention discloses a natural gas station pressure regulating valve noise reduction spacing determination method and terminal, and the method comprises the following steps: building a physical model according to geometric parameters of a pressure regulating valve and a pipeline structure connected with the pressure regulating valve, and simulating a noise generation process in the physical model; selecting a corresponding calculation model, and calculating to obtain a flow field numerical value; selecting a corresponding calculation model, determining a plurality of key points as pulsating pressure monitoring points, converting the flow field into a dipole sound source of a valve and a pipeline, and obtaining sound field time domain and frequency domain analysis results; according to the sound field time domain and frequency domain analysis results and the corresponding pressure regulating mode, the distance between the pressure regulating valves and the manifold or the distance between the pressure regulating valves is regulated, and the optimal distance is determined. According to the method, the noise generation process is subjected to simulation calculation by adopting a method based on numerical simulation, and the noise is digitized, so that the optimization method for setting the process spacing of the pressure regulating valve is formulated, the noise influence of the pressure regulating valve is effectively reduced, and the physical and psychological health of station yard personnel is guaranteed.

Description

Technical Field

[0001] The present invention relates to the technical field of noise reduction, and in particular to a method and a terminal for determining a noise reduction spacing of a natural gas station pressure regulating valve. Background Art

[0002] As a clean and efficient energy source and an important chemical raw material, natural gas is widely used in my country. At present, the domestic natural gas transportation method is still mainly based on long-distance natural gas pipelines and regional natural gas pipelines. In order to adjust the state of natural gas in the pipe, a pressure regulating valve is usually installed in the constructed natural gas station. The main function of the pressure regulating valve is to adjust and control the flow and pressure of the fluid in the pipe. It is usually connected to the inlet and outlet branch pipelines of the manifold for the distribution and pressure control of natural gas in the pipe. When the gas in the pipe passes through the pressure regulating valve, the flow direction and speed will change greatly due to the obstruction of the valve body structure, resulting in strong vortex and vortex, thereby causing high-decibel noise; at the same time, the noise of multiple adjacent pressure regulating valves will also form a superposition effect. Therefore, the noise at the pressure regulating valve is one of the largest noise sources in the natural gas station. If the noise is seriously exceeded, it will have a great negative impact on the life, physical and mental health of the station inspection personnel and the surrounding residents. To this end, it is necessary to study the noise generation process and noise reduction process of the pressure regulating valve in the natural gas station, and propose a scientific and applicable noise reduction optimization spacing.

[0003] The noise of the pressure regulating valve in the natural gas station mainly consists of two categories: mechanical vibration noise and fluid dynamics noise (flow noise). Mechanical vibration noise is directly related to the fluid pressure fluctuation caused by mechanical vibration, natural frequency vibration, valve core oscillation, etc., and this type of noise can be effectively controlled by controlling the quality of the components related to the pressure regulating valve; flow noise is directly related to the turbulence and eddy current generated when the gas passes through the valve body, and needs to be controlled through process adjustment and optimization. The existing theories on flow noise include: Lighthill acoustic analogy theory, Curle theory, Powell theory, Lilley acoustic analogy theory, FW-H theory proposed by Ffowcs, Ribner theory and Goldstein acoustic analogy theory. However, most of the research on noise reduction measures for natural gas station pressure regulating valves at home and abroad focuses on external noise reduction, and there is little research on process layout optimization methods. In addition, the detailed analysis method of the natural gas station pressure regulating valve mainly uses the commercial simulation software ANSYS Fluent for numerical simulation and calculation of flow field and acoustic field. Summary of the invention

[0004] In order to overcome the deficiencies in the prior art, the present invention aims to provide a method and terminal for determining the noise reduction spacing of a natural gas station pressure regulating valve. The method adopts a numerical simulation-based method to simulate and calculate the noise generation process, and digitizes the noise, thereby formulating an optimization method for setting the process spacing of the pressure regulating valve, effectively reducing the noise impact of the pressure regulating valve and ensuring the physical and mental health of station personnel.

[0005] The present invention is achieved through the following technical solutions:

[0006] A method for determining the noise reduction spacing of a natural gas station pressure regulating valve comprises the following steps:

[0007] S1: establishing a physical model according to geometric parameters of the pressure regulating valve and its connected pipeline structure, and simulating the noise generation process in the physical model;

[0008] S2: Select the corresponding calculation model and calculate the flow field value;

[0009] S3: According to the flow field value, a corresponding calculation model is selected, and several key points are determined as pulsating pressure monitoring points, the flow field is converted into a dipole sound source of the valve and the pipeline, and the time domain and frequency domain analysis results of the sound field are obtained;

[0010] S4: According to the time domain and frequency domain analysis results of the sound field and the corresponding pressure regulation method, the distance between the pressure regulating valve and the manifold or between the pressure regulating valves is adjusted to determine the optimal spacing.

[0011] Compared with the prior art, most of the research on noise reduction measures for natural gas station pressure regulating valves at home and abroad focuses on external noise reduction, while there are few issues on the research of process layout optimization methods. The present invention provides a method for determining the noise reduction spacing of natural gas station pressure regulating valves. In order to achieve the goal of reducing the noise of natural gas station pressure regulating valves, a method based on numerical simulation is used to simulate and calculate the noise generation process, and the noise is digitized, so as to formulate an optimization method for the process spacing setting of the pressure regulating valve, which effectively reduces the noise impact of the pressure regulating valve and ensures the physical and mental health of station personnel. The specific scheme mainly includes the following five parts: first, the construction of the physical model of the natural gas station pressure regulating valve and its connected pipelines; second, the selection and solution of the numerical simulation calculation model of the simulation software, that is, by verifying the corresponding calculation model, it is convenient to directly display the corresponding data when inputting the subsequent step data, such as the flow field cloud map and its numerical value; third, the numerical simulation of the flow field in the pressure regulating valve and its connected pipeline; fourth, the numerical simulation and characteristic analysis of the noise sound field of the pressure regulating valve and its connected pipeline; fifth, the determination of the noise reduction spacing of the pressure regulating valve. The above steps aim to achieve: based on numerical simulation methods, use commercial simulation software to analyze the flow noise generation process of the natural gas station pressure regulating valve, and obtain the optimal process spacing, so as to achieve the purpose of effectively reducing the noise of the pressure regulating valve. This method is helpful for the process optimization design and improvement of the noise reduction of the natural gas station pressure regulating valve.

[0012] In a further solution, in step S1, after the physical model is established, the established physical model needs to be meshed, and a tetrahedral mesh is selected as an unstructured mesh; at the same time, a mesh independence verification is performed to ensure the quality of the selected mesh.

[0013] In a further solution, in step S1, when simulating the noise generation process in the physical model, the inlet flow rate and outlet pressure of the actual pipeline natural gas in the physical model at the starting moment are used as initial conditions, and the inlet flow rate and outlet pressure of the natural gas in the model pipeline are used as boundary conditions.

[0014] In a further solution, in step S2, the selected calculation models include the LES large eddy simulation model and the k-ε turbulence model; the flow field values ​​include the velocity field and pressure field distribution of the entire pipeline, as well as the internal flow field turbulence and eddy characteristics.

[0015] In a further solution, in step S3, the selected calculation model is the FW-H model; the sound field time domain includes the sound pressure in the inlet and outlet trachea sound field and the sound pressure in the manifold body; the frequency domain includes the sound pressure level in the inlet and outlet trachea sound field and the sound pressure level in the manifold body.

[0016] In a further solution, the voltage regulation method includes a single-stage voltage regulation method and an N-stage voltage regulation method; N is an integer greater than 1.

[0017] In a further solution, in step S4, when the pressure regulation method is a single-stage pressure regulation method, the distance between the pressure regulating valve and the manifold is adjusted by increasing the same distance each time until the noise value at the monitoring point at the inlet of the downstream manifold no longer changes. At this time, the pressure regulating valve is set to the optimal spacing.

[0018] In a further solution, in step S4, when the pressure regulation mode is the N-stage pressure regulation mode, the distance between the N-stage pressure regulating valve and the manifold is adjusted by increasing the same distance each time until the noise value at the monitoring point at the inlet of the downstream manifold no longer changes, which is the optimal pressure regulating valve setting spacing for the N-stage pressure regulating valve; thereafter, the distance between the N-1-stage pressure regulating valve and the N-stage pressure regulating valve is adjusted by increasing the same distance each time until the noise value at the inlet monitoring point of the downstream N-stage pressure regulating valve no longer changes, which is the optimal pressure regulating valve setting spacing for the N-1-stage pressure regulating valve; the above steps are repeated until the noise value at the inlet monitoring point of the downstream second-stage pressure regulating valve no longer changes, which is the optimal spacing.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. The present invention provides a method and terminal for determining the noise reduction spacing of a natural gas station pressure regulating valve. The method adopts a numerical simulation-based method to simulate and calculate the noise generation process, and digitizes the noise, thereby formulating an optimization method for setting the process spacing of the pressure regulating valve, effectively reducing the noise impact of the pressure regulating valve and ensuring the physical and mental health of station personnel.

[0021] 2. The present invention provides a method and terminal for determining the noise reduction spacing of a natural gas station pressure regulating valve. When a single-stage pressure regulating valve is set, the noise level of the manifold and the pressure regulating valve pipeline can be effectively reduced by setting the optimal distance. In addition, by setting a two-stage pressure regulating valve, the noise of the single-stage pressure regulation can be effectively reduced, and the noise value of the entire pipeline can be effectively reduced by setting the optimal distance. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 A schematic flow chart of a method for determining a noise reduction spacing of a pressure regulating valve according to an embodiment of the present invention;

[0024] Figure 2The General panel in the second step of another embodiment provided by the present invention;

[0025] Figure 3 The Viscous Model panel in the second step of another embodiment provided by the present invention;

[0026] Figure 4 The Solution Methods panel in the second step of another embodiment provided by the present invention;

[0027] Figure 5 The Solution Controls panel in the second step of another embodiment provided by the present invention;

[0028] Figure 6 The Residual Monitors panel in the second step of another embodiment provided by the present invention;

[0029] Figure 7 The Acoustics Model panel in the second step of another embodiment provided by the present invention;

[0030] Figure 8 The Acoustics Sources panel in the second step of another embodiment provided by the present invention;

[0031] Fig. 9 A cloud diagram of velocity field of a single-stage pressure regulating valve and its pipeline in the third step of another embodiment provided by the present invention;

[0032] Fig.10 A pipeline layout diagram in which the secondary pressure regulating valve is located 800 mm downstream of the original pressure regulating valve in the third step of another embodiment provided by the present invention;

[0033] Fig.11 A pipeline layout diagram in which the secondary pressure regulating valve is located 800 mm upstream of the original pressure regulating valve in the third step of another embodiment provided by the present invention;

[0034] Fig.12 A pipeline layout diagram in which the secondary pressure regulating valve is located 1600 mm upstream of the original pressure regulating valve in the third step of another embodiment provided by the present invention;

[0035] Fig.13 A cloud diagram of the velocity field of a two-stage pressure regulating valve and its pipeline in the third step of another embodiment provided by the present invention;

[0036] Fig.14 A diagram showing the simulation results of the single-stage pressure regulating valve and its pipeline acoustic field in the fourth step of another embodiment provided by the present invention;

[0037] Fig.15A diagram showing the acoustic field simulation results when the secondary pressure regulating valve is located 800 mm downstream of the original pressure regulating valve in the fourth step of another embodiment provided by the present invention;

[0038] Fig.16 A diagram showing the acoustic field simulation results when the secondary pressure regulating valve is located 800 mm upstream of the original pressure regulating valve in the fourth step of another embodiment provided by the present invention;

[0039] Fig.17 A diagram showing the acoustic field simulation results when the secondary pressure regulating valve is located 1600 mm upstream of the original pressure regulating valve in the fourth step of another embodiment provided by the present invention;

[0040] Fig.18 The numerical simulation calculation result of the optimal spacing of the single-stage voltage regulation method of another embodiment provided by the present invention;

[0041] Fig.19 This is a numerical simulation calculation result of the optimal spacing of a two-stage voltage regulation method in another embodiment provided by the present invention. DETAILED DESCRIPTION

[0042] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0043] Embodiment 1:

[0044] like Figure 1 As shown, this embodiment 1 provides a method for determining the noise reduction spacing of a natural gas station pressure regulating valve, including the following specific steps:

[0045] The first step is to build a physical model.

[0046] (1) Establishing a geometric model: Based on the geometric dimensions of the pressure regulating valve and its connected pipeline structure, including pipe diameter, wall thickness, length, relative position of branch pipelines, etc., three-dimensional modeling is performed based on geometric modeling simulation software (Solidworks software or Gambit software, etc.).

[0047] (2) Meshing: ICEM software is used to mesh the established physical model, and the unstructured mesh selected is a tetrahedral mesh. At the same time, mesh independence verification is performed to ensure the quality of the selected mesh.

[0048] (3) Initial conditions: refer to the actual state of each point in the flow field in the physical model at the starting time, that is, the actual inlet flow rate and outlet pressure of the natural gas selected in the entire calculation management.

[0049] (4) Boundary conditions: The inlet velocity and outlet pressure of the model pipeline are boundary conditions.

[0050] The second step is to select and solve the computational model.

[0051] (1) Turbulence model: The k-ε model is used for steady-state simulation, and the LES large eddy model is used for transient simulation.

[0052] (2) Model solution: The commercial simulation software ANSYS Fluent is used to simulate and analyze the noise generation process, including: ① solving equations, selecting calculation models, and setting control parameter values; ② after completing the relevant solutions, the acquired data files are post-processed to directly display the flow field cloud map and its numerical value. That is, by verifying the corresponding calculation model, it is convenient to directly display the corresponding data, such as the flow field cloud map and its numerical value, when inputting the data in the subsequent steps.

[0053] The third step is numerical simulation of the flow field in the pressure regulating valve and its connected pipeline.

[0054] By modeling and numerically simulating the actual pressure regulating valve and manifold combined pipeline, the simulation calculation results show that: ① When a single-stage pressure regulation scheme is adopted, the velocity field and pressure field distribution of the entire pipeline, the internal flow field turbulence, eddy current, etc.; ② When a two-stage pressure regulation scheme is adopted, the velocity field and pressure field distribution of the entire pipeline, the internal flow field turbulence, eddy current, etc.

[0055] The fourth step is numerical simulation and characteristic analysis of the noise field of the pressure regulating valve and its connected pipelines.

[0056] Based on the numerical simulation of the internal flow field using ANSYS Fluent software, the flow field is further converted into a dipole sound source of the valve and pipeline through the FW-H model of Lighthill acoustic analogy theory; at the same time, key points are selected as pulsating pressure monitoring points. Thus, the time domain and frequency domain analysis results of the sound field are obtained: the sound pressure and sound pressure level in the sound field of the inlet and outlet pipes; the sound pressure and sound pressure level of the main body of the manifold; the sound pressure represents decibels, and the sound pressure level represents frequency.

[0057] The fifth step is to determine the noise reduction spacing of the pressure regulating valve.

[0058] The pressure regulating valves and their connected pipelines of the single-stage pressure regulating mode and the two-stage pressure regulating mode are modeled and numerically simulated in the same way as steps 1 to 4. For single-stage pressure regulation, the distance between the pressure regulating valve and the manifold is adjusted by increasing 400mm each time until the noise value of the downstream manifold inlet monitoring point no longer changes, which is the optimal pressure regulating valve setting spacing; for two-stage pressure regulation, the pressure change value of each stage of pressure regulation is 1 / 2 of the total pressure regulation value, and the distance between the second-stage pressure regulating valve (close to the manifold) and the manifold is adjusted by increasing 200mm each time until the noise value of the downstream manifold inlet monitoring point no longer changes, which is the optimal pressure regulating valve setting spacing for the second-stage pressure regulating valve. After that, the distance between the first-stage pressure regulating valve and the second-stage pressure regulating valve is adjusted by increasing 200mm each time until the noise value of the downstream second-stage pressure regulating valve inlet monitoring point no longer changes, which is the optimal spacing.

[0059] Step 6: Output the final result file, including: result file and calculation data.

[0060] Embodiment 2:

[0061] like Figure 2-Figure 19 As shown, this embodiment 2, based on embodiment 1, provides a specific implementation example of a method for determining the noise reduction spacing of a natural gas station pressure regulating valve.

[0062] This example takes a typical pressure regulating valve and manifold combination pipeline in a natural gas station of an oil and gas field as the analysis object, and implements the numerical simulation of the pressure regulating valve noise and the determination of the noise reduction distance. The relevant parameters of the manifold are: the length of the manifold barrel is 13755mm, and the outer diameter of the barrel is 900mm; the number of inlet pipes is 3, and the diameter of each pipe is 300mm and the length is 11050mm; the number of outlet pipes is 1, and the pipe diameter is 350mm and the length is 11050mm; the number of pressure regulating valves in each way is 1, and the parameters of the pressure regulating valve are DN300×200mm; the distance between the pressure regulating valve and the manifold barrel is 5454mm.

[0063] The specific numerical simulation steps and optimization methods are as follows:

[0064] The first step is to construct a physical model.

[0065] (1) Geometric model: Based on the structural parameters of the actual manifold, pressure regulating valve and pipeline, the three-dimensional simulation model was established using Solidworks software. The parameters include: the length, diameter and wall thickness of the manifold cylinder, the length, diameter and wall thickness of the inlet and outlet pipelines, and the relative position of the inlet and outlet pipelines. Considering the time and computing power resources of the three-dimensional simulation calculation, the simulated length of the outlet pipeline was selected as 1000mm. At the same time, according to the goals to be achieved by the numerical simulation, the schemes adopted are: ① single-stage pressure regulation method; ② two-stage pressure regulation method.

[0066] (2) Initial conditions: At the start time, the flow rates at the inlet end of the pressure regulating valve are v1 = 8.12 m / s, v2 = 8.07 m / s, v3 = 8.07 m / s, and the pressure at the outlet of the manifold is 2.8 MPa.

[0067] (3) Boundary conditions: The velocity at the inlet end of the pressure regulating valve and the pressure at the outlet end of the manifold are selected as boundary conditions.

[0068] (4) Grid selection and division: Unstructured tetrahedral grid is used to divide the grid of the simulation model of the entire pipeline.

[0069] The second step is to select and solve the numerical simulation calculation model.

[0070] (1) Selection of noise numerical simulation models: ① Large eddy simulation (LES) model; ② FW-H acoustic model; ③ k-ε turbulence model.

[0071] (2) The steps of solving the model are as follows: select the equation to be solved and input the control parameter value; after the solution is completed, import the obtained related files into Tecplot for flow field post-processing; in addition, save the data contained in the file.

[0072] The specific steps are as follows:

[0073] 1) Import the model into FLUENT for setting;

[0074] 2) In the General panel, click the Scale button to check whether the geometric area size of the model is correct;

[0075] 3) In the General panel, define the solver type under Solver; select "Pressure-Based" for Type; select "Transient" for Time to perform transient calculations. For detailed settings, see Figure 2 .

[0076] 4) Open Model and open the energy equation "Energy". Open "Viscous" to pop up the turbulence model dialog box, select the large eddy simulation model "LES"; select the Smagorinsky-Lilly option in the Sbugrid-Scale Model column; set Cs under Model Constants to 0.1, and keep the other values ​​unchanged; click the OK button to close the dialog box, and the Information dialog box pops up, click the OK button to close it. For detailed settings, see Figure 3 .

[0077] 5) Select the Materials option in the control tree on the left, and select the Fluid option in the list box of the Materials panel in the middle; click methane in the Fluent Database panel in the upper right corner and click Copy; then, click the Change / Create button and click the Close button to close the dialog box.

[0078] 6) Select the Boundary Conditions option in the control tree on the left. The inlet is velocity-inlet corresponding to the flow velocity and temperature of the three inlets; the outlet is pressure-outlet corresponding to the outlet pressure and outlet temperature.

[0079] 7) Select Solution Methods in the control tree on the left. In the middle Solution Methods panel, select PISO from the Scheme drop-down list in the Pressure-Velocity Coupling column; select PRESTO from the Pressure drop-down list in the SpatialDiscretization column; select Bounded Central Differencing from the Momentum drop-down list; keep the rest of the values ​​as default. Figure 4 .

[0080] 8) Select Solution Controls in the control tree on the left. Set Pressure to 0.75 in the Solution Methods panel in the middle; keep the other values ​​as default. Figure 5 .

[0081] 9) Select the Monitors option in the control tree on the left. Double-click the Residuals option in the Monitors panel in the middle; check the Plot option in the Residual Monitors dialog box that pops up; set Iterations to Store to 10000 and Iterations to Plot to 20; after setting, click the OK button to close the dialog box. For detailed settings, see Figure 6 .

[0082] 10) Select the Initialization option in the control tree on the left. Click Hybrid Initialization in the Solution Initialization panel in the middle to continue initialization settings.

[0083] 11) Select the Run Calculation option in the control tree on the left. Click the Run Calculation button in the middle Run Calculation panel; set the Number of Time Steps to 4000 and the Tize Step Sizes to 0.00025; click the Calculate button to start the flow field calculation.

[0084] 12) After the flow field calculation is completed, click Save case & data.

[0085] 13) Select the Model option in the control tree on the left. Double-click Acoustics to open the Acoustics Model acoustic model; open FW-H, and select the first Export Acoustic Source Data in ASDFormat under Export Options (see Figure 7 ). Click Define Sources to open the Acoustics Sources panel; define the noise receiving source. Under Sources Zones, select wall; set File Name to FW-H, Write Frequency to 1; set Number of Time Steps per File to 200 (see Figure 8 ); click Define Receivers to define the noise receiving points and input the corresponding monitoring point coordinates.

[0086] 14) Select Solution Controls in the control tree on the left. Set Pressure to 1 in the Solution Methods panel in the middle and leave the rest unchanged.

[0087] 15) Select the Run Calculation option in the control tree on the left. Click the Calculate button to start the sound field calculation.

[0088] The third step is numerical simulation of flow field.

[0089] (1) Single-stage voltage regulation method

[0090] According to the actual situation of this example, the flow field numerical simulation and characteristic analysis of the constructed single-stage pressure regulating method are carried out. The flow field simulation results of the single-stage pressure regulating valve and its pipeline are as follows: Fig. 9 shown.

[0091] (2) Two-stage voltage regulation method

[0092] According to the actual situation of this example, the flow field numerical simulation and characteristic analysis of the constructed two-stage pressure regulation method are carried out. The pipeline layout is as follows Figure 10-12 The simulation results of the flow field of the two-stage pressure regulating valve and its pipeline (the second-stage pressure regulating valve is located 800mm upstream of the original pressure regulating valve) are shown in Figure 2. Fig.13 shown.

[0093] The fourth step is numerical simulation and characteristic analysis of the sound field.

[0094] Open the LES model in ANSYS Fluent. The method to open the LES model is: enter (rpsetvar'les-3d?#t), ​​open the model in Models, and select the FW-H equation. 13 monitoring points are selected in the entire pipeline, and Define Receivers are set. Among them, the coordinates of the 13 monitoring points are: 1(-3.3, 0.42426, 0), 2(-1.1, 0.42426, 0), 3(1.1, 0.42426, 0), 4(-4.9, -0.42426, 0), 5(-3.3, 5.904, 0), 6(-3.3, 6.2, 0), 7(-3.3, 6.496, 0), 8(-1.1, 5.904, 0), 9(-1.1, 6.2, 0), 10(-1.1, 6.496, 0), 11(1.1, 5.904, 0), 12(1.1, 6.2, 0), 13(1.1, 6.496, 0).

[0095] (1) Single-stage voltage regulation method

[0096] According to the actual situation of this example, the acoustic field numerical simulation and characteristic analysis of the constructed single-stage pressure regulating method are carried out. The acoustic field simulation results of the single-stage pressure regulating valve and its pipeline are as follows: Fig.14 shown.

[0097] (2) Two-stage voltage regulation method

[0098] According to the actual situation of this example, the flow field numerical simulation and characteristic analysis of the constructed two-stage pressure regulation method are carried out. The simulation results of the acoustic field of the two-stage pressure regulating valve and its pipeline are as follows: Figure 15-17 shown.

[0099] Step 5: Determine the optimal spacing of the pressure regulating valve.

[0100] (1) Single-stage voltage regulation method

[0101] For single-stage pressure regulation, the distance between the pressure regulating valve and the manifold is adjusted by increasing by 400 mm each time until the noise value at the downstream manifold inlet monitoring point no longer changes. This is the optimal pressure regulating valve setting distance. The numerical simulation calculation results of the optimal distance for single-stage pressure regulation are as follows: Fig.18 As shown in the figure, the optimal distance D = 6.7 m.

[0102] (2) Two-stage voltage regulation method

[0103] For two-stage pressure regulation, the pressure change value of each stage is 1 / 2 of the total pressure regulation value. The distance between the second-stage pressure regulating valve (close to the manifold) and the manifold is adjusted by increasing by 200mm each time until the noise value at the downstream manifold inlet monitoring point no longer changes. This is the optimal pressure regulating valve setting spacing for the second-stage pressure regulating valve. After that, the distance between the first-stage pressure regulating valve and the second-stage pressure regulating valve is adjusted by increasing by 200mm each time until the noise value at the downstream second-stage pressure regulating valve inlet monitoring point no longer changes. This is the optimal spacing. The numerical simulation calculation results of the optimal spacing for the two-stage pressure regulation method are as follows: Fig.19 As shown in the figure, the optimal spacing is D = 1.6 m.

[0104] Embodiment 3:

[0105] In some exemplary embodiments, the present embodiment also provides a device for determining the noise reduction spacing of natural gas station pressure regulating valves, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements a minimum technical solution for a method for determining the noise reduction spacing of natural gas station pressure regulating valves as described in Example 3 for achieving the purpose of "using a numerical simulation-based method to simulate and calculate the noise generation process, and digitize the noise, thereby formulating an optimization method for setting the process spacing of the pressure regulating valves, effectively reducing the noise impact of the pressure regulating valves, and ensuring the physical and mental health of station personnel."

[0106] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0107] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0108] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0109] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0110] A person of ordinary skill in the art can understand that all or part of the steps in realizing the above-mentioned facts and methods can be completed by instructing the relevant hardware through a program, and the program involved or the program described can be stored in a computer-readable storage medium. When the program is executed, it includes the following steps: At this time, the corresponding method steps are derived, and the storage medium can be ROM / RAM, a disk, an optical disk, etc.

[0111] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for determining the noise reduction spacing of a natural gas station pressure regulating valve, characterized in that: The following steps are involved: S1: establishing a physical model according to geometric parameters of the pressure regulating valve and its connected pipeline structure, and simulating the noise generation process in the physical model; S2: Select the corresponding calculation model and calculate the flow field value; S3: According to the flow field value, a corresponding calculation model is selected, and several key points are determined as pulsating pressure monitoring points, the flow field is converted into a dipole sound source of the valve and the pipeline, and the time domain and frequency domain analysis results of the sound field are obtained; S4: According to the time domain and frequency domain analysis results of the sound field and the corresponding pressure regulation method, the distance between the pressure regulating valve and the manifold or between the pressure regulating valves is adjusted to determine the optimal spacing.

2. A method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 1, characterized in that: In the step S1, after the physical model is established, the established physical model needs to be meshed, and a tetrahedral mesh is selected as an unstructured mesh; at the same time, a mesh independence verification is performed to ensure the quality of the selected mesh.

3. The method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 1 is characterized in that: In step S1, when simulating the noise generation process in the physical model, the inlet flow rate and outlet pressure of the actual pipeline natural gas in the physical model at the starting moment are used as initial conditions, and the inlet flow rate and outlet pressure of the natural gas in the model pipeline are used as boundary conditions.

4. The method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 1 is characterized in that: In the step S2, the selected calculation models include the LES large eddy simulation model and the k-ε turbulence model; the flow field values ​​include the velocity field and pressure field distribution of the entire pipeline, as well as the internal flow field turbulence and eddy characteristics.

5. The method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 1 is characterized in that: In step S3, the selected calculation model is the FW-H model; the sound field time domain includes the sound pressure in the inlet and outlet trachea sound field and the sound pressure in the manifold body; the frequency domain includes the sound pressure level in the inlet and outlet trachea sound field and the sound pressure level in the manifold body.

6. A method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 1, characterized in that: The voltage regulation method includes a single-stage voltage regulation method and an N-stage voltage regulation method; N is an integer greater than 1.

7. A method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 6, characterized in that: In step S4, when the pressure regulation mode is a single-stage pressure regulation mode, the distance between the pressure regulating valve and the manifold is adjusted by increasing the same distance each time until the noise value at the monitoring point at the downstream manifold inlet no longer changes. At this time, the pressure regulating valve setting distance is optimal.

8. A method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to claim 6, characterized in that: In the step S4, when the pressure regulation mode is the N-stage pressure regulation mode, the distance between the N-stage pressure regulating valve and the manifold is adjusted by increasing the same distance each time until the noise value at the monitoring point at the inlet of the downstream manifold no longer changes, which is the optimal pressure regulating valve setting distance for the N-stage pressure regulating valve; thereafter, the distance between the N-1-stage pressure regulating valve and the N-stage pressure regulating valve is adjusted by increasing the same distance each time until the noise value at the inlet monitoring point of the downstream N-stage pressure regulating valve no longer changes, which is the optimal pressure regulating valve setting distance for the N-1-stage pressure regulating valve; Repeat the above steps until the noise value at the inlet monitoring point of the downstream second-stage pressure regulating valve no longer changes, which is the optimal spacing.

9. A terminal, characterized in that: It includes at least one processor and a memory that is communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute a method for determining the noise reduction spacing of a natural gas station pressure regulating valve as described in any one of claims 1 to 8.

10. A storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, a method for determining the noise reduction spacing of a natural gas station pressure regulating valve according to any one of claims 1 to 8 is implemented.

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