Method for checking flow rate of diaphragm compressor and checking system thereof

Abstract

This invention discloses a flow rate verification method and system for diaphragm compressors. The method includes the following steps: S1: Multi-dimensional operating condition parameter acquisition and verification benchmark setting; S2: Maximum gas consumption calculation and standard condition volume conversion; S3: Correction for actual gas state of high-pressure nitrogen; S4: Calculation of theoretical gas replenishment time and preliminary qualification judgment; S5: Engineering redundancy correction and final verification conclusion output. This invention eliminates high-pressure calculation errors by using actual gas state equations, improves engineering fit by coupling the actual structure of the system such as gas storage cylinders, manifolds, and pipelines, and establishes a complete closed-loop verification process including redundancy correction and qualification judgment. This effectively solves the problems of low accuracy, large deviation from engineering applications, and inability to be directly used for equipment selection and acceptance of traditional verification methods, significantly improving the accuracy, reliability, and practicality of diaphragm compressor flow rate verification.

Description

Technical Field

[0001] This invention relates to the field of diaphragm compressor technology, and in particular to a flow rate verification method and system for diaphragm compressors. Background Technology

[0002] The ultra-high pressure cold flow rapid pressurization test system is used to provide the test sample with nitrogen medium at a pressure of 5MPa to 100MPa and a maximum flow rate of 40kg / s. The core gas source is provided by a diaphragm compressor. The flow rate of the diaphragm compressor directly determines the gas replenishment time between two consecutive tests and is a key indicator to ensure test efficiency. Currently, the flow rate verification methods for diaphragm compressors generally have the following technical defects: 1. They are calculated only based on ideal gas and do not consider the deviation between nitrogen under high pressure and ideal gas, resulting in large flow rate calculation errors; 2. They do not couple with the actual structure of gas storage cylinders, manifolds, pipeline volumes, etc., resulting in significant deviations between the verification results and engineering applications; 3. They lack a complete redundancy correction, qualification judgment, and closed-loop verification process, making them unsuitable for direct equipment selection and acceptance. In view of the above, this application proposes a flow rate verification method and verification system for diaphragm compressors. Summary of the Invention

[0003] Based on the technical problems existing in the background art, the present invention proposes a flow rate verification method and verification system for diaphragm compressors.

[0004] The present invention proposes a flow rate verification method for a diaphragm compressor, comprising the following steps:

[0005] S1: Multi-dimensional operating condition parameter acquisition and verification benchmark setting: Comprehensive acquisition of key operating condition parameters of the high-pressure nitrogen test system, clarification of verification boundary conditions, acquisition content includes maximum mass flow rate of medium pressure section, continuous gas supply time, target pressure, manifold volume, gas storage cylinder volume, ambient temperature, and acquisition of rated outlet pressure and standard volume flow rate of diaphragm compressor to establish a unified verification benchmark;

[0006] S2: Calculation of maximum gas consumption and conversion of standard condition volume: Based on the principle of mass conservation, the maximum gas consumption mass of a single test is calculated, and then the mass gas consumption is converted into the volume gas consumption under standard conditions. The minimum gas replenishment volume required by the system is obtained based on the most stringent test conditions, providing the core input for subsequent flow rate verification.

[0007] S3: Correction for the actual gas state of high-pressure nitrogen: The van der Waals equation of state is used to correct the density and pressure of nitrogen under high-pressure conditions, eliminating the high-pressure calculation deviation caused by the ideal gas assumption and ensuring the accuracy of the calculation of the relationship between gas storage capacity, density and pressure.

[0008] S4: Calculation of theoretical gas replenishment time and preliminary judgment of passability: Based on the standard gas consumption and the standard flow rate of the diaphragm compressor, calculate the theoretical gas replenishment time, and directly compare the calculated gas replenishment time with the allowable test interval time to complete the preliminary verification and judgment of the flow capacity of the diaphragm compressor.

[0009] S5: Engineering Redundancy Correction and Final Verification Conclusion Output: Introducing pipeline loss, pressure fluctuation, safety margin, and engineering redundancy coefficient, the theoretical gas replenishment time is corrected, and a final verification conclusion is given based on the corrected results to ensure that the verification results meet the requirements of engineering safety and continuous test reliability.

[0010] Preferably, the specific logical steps of S1 are as follows:

[0011] S101: The maximum mass flow rate is set based on the most stringent test conditions in the medium-pressure section. Longest continuous gas supply time The maximum allowable interval between two gas replenishment tests The highest target pressure in the medium-pressure section Standard ambient temperature Complete the definition of the verification boundary conditions;

[0012] S102: Collect fixed structural parameters of the high-pressure nitrogen storage and supply system, including the total volume of the storage cylinders. manifold volume Calculate the total effective gas storage volume Simultaneously, nitrogen medium constant and standard density were collected. Gas constant This provides basic parameters for calculating gas consumption and gas storage.

[0013] S103: Collects core operating parameters of the diaphragm compressor, including standard volumetric flow rate. Rated outlet pressure And preset the compressor overall efficiency coefficient. This is used to correct for actual operating conditions during subsequent gas replenishment time;

[0014] S104: Real-time pressure of gas cylinder and manifold is collected via sensors. Real-time temperature of gas and environment The signal is filtered and error calibrated to eliminate the impact of on-site interference on the verification calculation;

[0015] S105: Integrate the above-mentioned benchmark definitions, structural parameters, medium constants, compressor performance, and real-time status data to form a unified verification benchmark set. This serves as the standard input for all subsequent calculations.

[0016] Preferably, the specific logical steps of S2 are as follows:

[0017] S201: Based on the maximum mass flow rate and the longest continuous gas supply time set for the experiment, calculate the total mass of nitrogen consumed during the experiment using the mass conservation formula. The calculation formula is as follows: ,in This represents the maximum gas consumption in a single test. This represents the maximum test mass flow rate in the medium-pressure section. This is the longest duration of constant pressure gas supply;

[0018] S202: Using the standard density of nitrogen, the mass of gas consumed is converted into the volumetric gas consumption at standard conditions of 0℃ and 101.325kPa, which serves as the direct basis for the gas supply to the diaphragm compressor. The conversion formula is as follows: ,in This refers to the gas volume consumed in a single test under standard conditions. This represents the maximum gas consumption in a single test. This refers to the standard density of nitrogen.

[0019] S203: The standard volumetric gas consumption is used as the minimum replenishment volume required by the diaphragm compressor and output to the subsequent flow verification module to ensure that the verification benchmark is consistent and the calculation is traceable.

[0020] Preferably, the specific logical steps of S3 are as follows:

[0021] S301: To address the significant deviation between nitrogen and an ideal gas under high-pressure conditions, the van der Waals equation is introduced to realistically describe the gas state. The formula is as follows: ;

[0022] in The absolute pressure of nitrogen gas. The specific volume of nitrogen is given. This is the van der Waals correction constant for nitrogen. R is the van der Waals correction constant for nitrogen, R is the nitrogen gas constant, and T is the thermodynamic temperature.

[0023] S302: Calculate van der Waals constants a and b based on nitrogen critical state parameters to adapt the equations to nitrogen medium. Nitrogen critical state parameters include the nitrogen critical temperature. Critical pressure The formula used is: ,in The critical specific volume of nitrogen;

[0024] S303: At standard verification temperature Below, the true density of nitrogen gas in the range of 5 MPa to 30 MPa is calculated using the real gas equation. And the relationship between density and specific volume is ,in The specific volume of nitrogen under high pressure;

[0025] S304: Total volume of combined gas cylinder and manifold The effective gas storage capacity of the system is calculated using the true density, and the actual gas volume is corrected using the following correction formula: ,in This represents the actual effective gas storage capacity of the system. This represents the true density of high-pressure nitrogen. This refers to the total effective volume of the gas cylinder and manifold.

[0026] S305: Organizes the corrected pressure, density, and gas storage data into a unified state dataset, replacing the ideal gas calculation results, and providing high-precision input for gas replenishment time verification.

[0027] Preferably, the specific logical steps of S4 are as follows:

[0028] S401: Based on the gas consumption volume and compressor volumetric flow rate under standard conditions, calculate the theoretical gas replenishment time without considering any losses. The calculation formula is as follows: ,in This is the theoretical gas injection time for the diaphragm compressor. This represents the gas consumption volume under standard conditions for a single test. This refers to the standard volumetric flow rate of the diaphragm compressor.

[0029] S402: Considering compressor start-up and shutdown, pressure build-up, and pipeline charging and discharging losses, a comprehensive efficiency coefficient is introduced to correct the theoretical time, resulting in the actual gas replenishment time in the project. The calculation formula is as follows: ,in The actual gas replenishment time should take into account efficiency losses. This refers to the purely theoretical time for replenishing Qi. The overall operating efficiency coefficient of the diaphragm compressor;

[0030] S403: Compare the calculated actual gas replenishment time with the system's maximum allowable test interval to complete the preliminary qualification check of the flow capacity. The judgment rule is as follows: ,in This refers to the actual time for replenishing Qi. The upper limit of the allowable gas replenishment interval for continuous testing;

[0031] S404: Output the theoretical gas replenishment time, actual gas replenishment time, comparison results, and qualification conclusion in a unified manner, as the basis for subsequent redundancy correction and final verification.

[0032] Preferably, the specific logical steps of S5 are as follows:

[0033] S501: Introduces an engineering redundancy factor to provide safety compensation for actual gas replenishment time, covering pipeline losses, leakage, temperature fluctuations, and test margins. The calculation formula is as follows: ,in The final verification gas replenishment time after redundancy correction. To account for the actual gas replenishment time after efficiency correction, k is the engineering redundancy coefficient;

[0034] S502: Compare the final gas replenishment time after redundancy correction with the maximum allowable test interval of the system, and complete the final verification according to the judgment criteria. The judgment formula is as follows: ,in For the final verification of the gas replenishment time, To allow for the upper limit of the continuous test gas replenishment interval, the flow rate must meet the above formula to be considered qualified; otherwise, it will be considered unqualified.

[0035] S503: Verify the rated discharge pressure of the diaphragm compressor to ensure that the pressure parameters simultaneously meet the system design requirements. The judgment criteria are as follows: ,in The rated discharge pressure of the diaphragm compressor. The minimum working pressure required by the system is determined by the above formula, which indicates that the pressure index is qualified.

[0036] S504: Integrates flow verification results, pressure verification results, and calculation data from each stage to form the final verification conclusion, including qualification criteria, recommended selection basis, and safety margin explanation, serving as the formal basis for equipment acceptance, system debugging, and solution verification.

[0037] The present invention also proposes a flow verification system for a diaphragm compressor, including a data acquisition module, a gas consumption calculation module, a flow verification module, a redundancy correction module, a human-machine interaction module, and a PLC communication module;

[0038] The data acquisition module is connected to the test system sensors and the diaphragm compressor. The test system sensors include a gas cylinder pressure transmitter, a manifold pressure transmitter, a temperature sensor, and a diaphragm compressor controller. The data acquisition module is used to synchronously transmit the collected pressure, temperature, flow rate, volume, and compressor parameters to the gas consumption calculation module.

[0039] The gas consumption calculation module is used to perform mass conservation and actual gas equation calculations.

[0040] The flow verification module is used to perform gas replenishment time calculation and qualification judgment, and sends the verification results to the human-machine interface for display and storage.

[0041] The redundancy correction module is used to perform engineering redundancy compensation on the theoretical gas injection time, forming a closed-loop correction and verification.

[0042] The human-computer interaction module is used for parameter configuration, verification process monitoring, result display, report generation, and historical data query.

[0043] The PLC communication module is used to realize the uploading of field equipment data, the issuance of remote verification commands, and the linkage monitoring of equipment status.

[0044] Preferably, the input terminal of the gas consumption calculation module is connected to the output terminal of the data acquisition module, the output terminal of the gas consumption calculation module is connected to the input terminal of the flow verification module, the input terminal of the redundancy correction module is connected to the output terminal of the flow verification module, the correction output terminal of the redundancy correction module is connected back to the compensation input terminal of the flow verification module to form a redundancy correction closed loop, the result output terminal of the flow verification module is connected to the human-machine interaction module, and the PLC communication module communicates bidirectionally with the data acquisition module, the diaphragm compressor, and the test system sensors to realize real-time interaction of verification data and equipment linkage control.

[0045] Compared with existing technologies, the beneficial effects of this invention are:

[0046] 1. This invention corrects the density, pressure and storage capacity of nitrogen by introducing the van der Waals real gas equation of state, fully considering the influence of gas molecule volume and intermolecular forces under high pressure, and greatly improves the calculation accuracy of flow rate, gas consumption and gas replenishment time under high pressure, so that the verification results are more consistent with the actual state of the gas.

[0047] 2. This invention incorporates the actual structural parameters of the system, such as the volume of the gas storage cylinder, the volume of the manifold, and the volume of the pipeline, into the verification process, realizing the integrated calculation of test gas consumption, gas storage capacity, and gas replenishment requirements. This solves the problem that the verification results of traditional methods, which are not coupled with the actual on-site structure, have significant deviations from engineering applications, making the flow rate verification more consistent with the actual operating conditions of the test system.

[0048] 3. This invention establishes a complete process from parameter acquisition, gas consumption calculation, flow rate verification, redundancy correction to qualification determination, forming a quantifiable, reproducible, and closed-loop verifiable verification mechanism. It solves the problem that traditional methods lack a complete verification process and cannot be directly used for equipment selection and acceptance. The output conclusions can be directly used as the basis for diaphragm compressor selection, system design, factory acceptance, and on-site commissioning.

[0049] This invention eliminates high-pressure calculation errors by adopting actual gas state equations, improves engineering fit by coupling the actual structure of systems such as gas storage cylinders, manifolds, and pipelines, and establishes a complete closed-loop verification process that includes redundancy correction and qualification judgment. This effectively solves the problems of low accuracy, large deviation from engineering applications, and inability to be directly used for equipment selection and acceptance of traditional verification methods, and significantly improves the accuracy, reliability, and practicality of diaphragm compressor flow verification. Attached Figure Description

[0050] Figure 1 This is a flowchart of a flow rate verification method for a diaphragm compressor proposed in this invention;

[0051] Figure 2 This is a block diagram of a flow verification system for a diaphragm compressor proposed in this invention. Detailed Implementation

[0052] The present invention will be further explained below with reference to specific embodiments.

[0053] Example

[0054] Reference Figure 1 This embodiment proposes a flow rate verification method for a diaphragm compressor, including the following steps:

[0055] S1: Multi-dimensional operating condition parameter acquisition and verification benchmark setting: Comprehensive acquisition of key operating condition parameters of the high-pressure nitrogen test system, clarification of verification boundary conditions, acquisition content includes maximum mass flow rate of medium pressure section, continuous gas supply time, target pressure, manifold volume, gas storage cylinder volume, ambient temperature, and acquisition of rated outlet pressure and standard volume flow rate of diaphragm compressor to establish a unified verification benchmark;

[0056] The specific logical steps are as follows:

[0057] S101: The maximum mass flow rate is set based on the most stringent test conditions in the medium-pressure section. Longest continuous gas supply time The maximum allowable interval between two gas replenishment tests The highest target pressure in the medium-pressure section Standard ambient temperature Complete the definition of the verification boundary conditions;

[0058] S102: Collect fixed structural parameters of the high-pressure nitrogen storage and supply system, including the total volume of the storage cylinders. manifold volume Calculate the total effective gas storage volume Simultaneously, nitrogen medium constant and standard density were collected. Gas constant This provides basic parameters for calculating gas consumption and gas storage.

[0059] S103: Collects core operating parameters of the diaphragm compressor, including standard volumetric flow rate. Rated outlet pressure And preset the compressor overall efficiency coefficient. This is used to correct for actual operating conditions during subsequent gas replenishment time;

[0060] S104: Real-time pressure of gas cylinder and manifold is collected via sensors. Real-time temperature of gas and environment The signal is filtered and error calibrated to eliminate the impact of on-site interference on the verification calculation;

[0061] S105: Integrate the above-mentioned benchmark definitions, structural parameters, medium constants, compressor performance, and real-time status data to form a unified verification benchmark set. This serves as the standard input for all subsequent calculations.

[0062] S2: Calculation of maximum gas consumption and conversion of standard condition volume: Based on the principle of mass conservation, the maximum gas consumption mass of a single test is calculated, and then the mass gas consumption is converted into the volume gas consumption under standard conditions. The minimum gas replenishment volume required by the system is obtained based on the most stringent test conditions, providing the core input for subsequent flow rate verification.

[0063] The specific logical steps are as follows:

[0064] S201: Based on the maximum mass flow rate and the longest continuous gas supply time set for the experiment, calculate the total mass of nitrogen consumed during the experiment using the mass conservation formula. The calculation formula is as follows: ,in This represents the maximum gas consumption in a single test. This represents the maximum test mass flow rate in the medium-pressure section. This is the longest duration of constant pressure gas supply;

[0065] S202: Using the standard density of nitrogen, the mass of gas consumed is converted into the volumetric gas consumption at standard conditions of 0℃ and 101.325kPa, which serves as the direct basis for the gas supply to the diaphragm compressor. The conversion formula is as follows: ,in This refers to the gas volume consumed in a single test under standard conditions. This represents the maximum gas consumption in a single test. This refers to the standard density of nitrogen.

[0066] S203: The standard volumetric gas consumption is used as the minimum make-up gas volume required by the diaphragm compressor and output to the subsequent flow verification module to ensure that the verification benchmark is consistent and the calculation is traceable;

[0067] S3: Correction for the actual gas state of high-pressure nitrogen: The van der Waals equation of state is used to correct the density and pressure of nitrogen under high-pressure conditions, eliminating the high-pressure calculation deviation caused by the ideal gas assumption and ensuring the accuracy of the calculation of the relationship between gas storage capacity, density and pressure.

[0068] The specific logical steps are as follows:

[0069] S301: To address the significant deviation between nitrogen and an ideal gas under high-pressure conditions, the van der Waals equation is introduced to realistically describe the gas state. The formula is as follows: ;

[0070] in The absolute pressure of nitrogen gas. The specific volume of nitrogen is given. This is the van der Waals correction constant for nitrogen. R is the van der Waals correction constant for nitrogen, R is the nitrogen gas constant, and T is the thermodynamic temperature.

[0071] S302: Calculate van der Waals constants a and b based on nitrogen critical state parameters to adapt the equations to nitrogen medium. Nitrogen critical state parameters include the nitrogen critical temperature. Critical pressure The formula used is: ,in The critical specific volume of nitrogen;

[0072] S303: At standard verification temperature Below, the true density of nitrogen gas in the range of 5 MPa to 30 MPa is calculated using the real gas equation. And the relationship between density and specific volume is ,in The specific volume of nitrogen under high pressure;

[0073] S304: Total volume of combined gas cylinder and manifold The effective gas storage capacity of the system is calculated using the true density, and the actual gas volume is corrected using the following correction formula: ,in This represents the actual effective gas storage capacity of the system. This represents the true density of high-pressure nitrogen. This refers to the total effective volume of the gas cylinder and manifold.

[0074] S305: Organizes the corrected pressure, density, and gas storage data into a unified state dataset to replace the ideal gas calculation results and provide high-precision input for gas replenishment time verification;

[0075] S4: Calculation of theoretical gas replenishment time and preliminary judgment of passability: Based on the standard gas consumption and the standard flow rate of the diaphragm compressor, calculate the theoretical gas replenishment time, and directly compare the calculated gas replenishment time with the allowable test interval time to complete the preliminary verification and judgment of the flow capacity of the diaphragm compressor.

[0076] The specific logical steps are as follows:

[0077] S401: Based on the gas consumption volume and compressor volumetric flow rate under standard conditions, calculate the theoretical gas replenishment time without considering any losses. The calculation formula is as follows: ,in This is the theoretical gas injection time for the diaphragm compressor. This represents the gas consumption volume under standard conditions for a single test. This refers to the standard volumetric flow rate of the diaphragm compressor.

[0078] S402: Considering compressor start-up and shutdown, pressure build-up, and pipeline charging and discharging losses, a comprehensive efficiency coefficient is introduced to correct the theoretical time, resulting in the actual gas replenishment time in the project. The calculation formula is as follows: ,in The actual gas replenishment time should take into account efficiency losses. This refers to the purely theoretical time for replenishing Qi. The overall operating efficiency coefficient of the diaphragm compressor;

[0079] S403: Compare the calculated actual gas replenishment time with the system's maximum allowable test interval to complete the preliminary qualification check of the flow capacity. The judgment rule is as follows: ,in This refers to the actual time for replenishing Qi. The upper limit of the allowable gas replenishment interval for continuous testing;

[0080] S404: Output the theoretical gas replenishment time, actual gas replenishment time, comparison results, and qualification conclusion in a unified manner as the basis for subsequent redundancy correction and final verification.

[0081] S5: Engineering Redundancy Correction and Final Verification Conclusion Output: Introducing pipeline loss, pressure fluctuation, safety margin, and engineering redundancy coefficient, the theoretical gas replenishment time is corrected, and a final verification conclusion is given based on the corrected results to ensure that the verification results meet the requirements of engineering safety and continuous test reliability.

[0082] The specific logical steps are as follows:

[0083] S501: Introduces an engineering redundancy factor to provide safety compensation for actual gas replenishment time, covering pipeline losses, leakage, temperature fluctuations, and test margins. The calculation formula is as follows: ,in The final verification gas replenishment time after redundancy correction. To account for the actual gas replenishment time after efficiency correction, k is the engineering redundancy coefficient;

[0084] S502: Compare the final gas replenishment time after redundancy correction with the maximum allowable test interval of the system, and complete the final verification according to the judgment criteria. The judgment formula is as follows: ,in For the final verification of the gas replenishment time, To allow for the upper limit of the continuous test gas replenishment interval, the flow rate must meet the above formula to be considered qualified; otherwise, it will be considered unqualified.

[0085] S503: Verify the rated discharge pressure of the diaphragm compressor to ensure that the pressure parameters simultaneously meet the system design requirements. The judgment criteria are as follows: ,in The rated discharge pressure of the diaphragm compressor. The minimum working pressure required by the system is determined by the above formula, which indicates that the pressure index is qualified.

[0086] S504: Integrates flow verification results, pressure verification results, and calculation data from each stage to form the final verification conclusion, including qualification criteria, recommended selection basis, and safety margin explanation, serving as the formal basis for equipment acceptance, system debugging, and solution verification.

[0087] Reference Figure 2 This embodiment proposes a flow verification system for a diaphragm compressor, including a data acquisition module, a gas consumption calculation module, a flow verification module, a redundancy correction module, a human-machine interaction module, and a PLC communication module;

[0088] The input of the gas consumption calculation module is connected to the output of the data acquisition module, the output of the gas consumption calculation module is connected to the input of the flow verification module, the input of the redundancy correction module is connected to the output of the flow verification module, the correction output of the redundancy correction module is connected back to the compensation input of the flow verification module to form a redundancy correction closed loop, the result output of the flow verification module is connected to the human-machine interaction module, and the PLC communication module communicates bidirectionally with the data acquisition module, the diaphragm compressor, and the test system sensors to realize real-time interaction of verification data and equipment linkage control.

[0089] The data acquisition module is connected to the test system sensors and the diaphragm compressor. The test system sensors include a gas cylinder pressure transmitter, a manifold pressure transmitter, a temperature sensor, and a diaphragm compressor controller. The data acquisition module is used to synchronously transmit the collected pressure, temperature, flow rate, volume, and compressor parameters to the gas consumption calculation module.

[0090] The gas consumption calculation module is used to perform mass conservation and real gas equation calculations;

[0091] The flow verification module is used to perform gas replenishment time calculation and qualification judgment, and sends the verification results to the human-machine interface for display and storage.

[0092] The redundancy correction module is used to perform engineering redundancy compensation on the theoretical gas injection time, forming a closed-loop correction and verification.

[0093] The human-computer interaction module is used for parameter configuration, verification process monitoring, result display, report generation, and historical data query.

[0094] The PLC communication module is used to realize the uploading of field equipment data, the issuance of remote verification commands, and the linkage monitoring of equipment status.

[0095] This embodiment eliminates high-pressure calculation errors by adopting the actual gas state equation, improves engineering fit by coupling the actual structure of the gas storage cylinder, manifold, and pipeline systems, and establishes a complete closed-loop verification process that includes redundancy correction and qualification judgment. This effectively solves the problems of low accuracy, large deviation from engineering applications, and inability to be directly used for equipment selection and acceptance of traditional verification methods, and significantly improves the accuracy, reliability, and practicality of diaphragm compressor flow verification.

[0096] The above description is only a preferred embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technical solution and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A method of flow calibration of a diaphragm compressor, characterized by, Includes the following steps: S1: Multi-dimensional operating condition parameter acquisition and verification benchmark setting: Comprehensive acquisition of key operating condition parameters of the high-pressure nitrogen test system, clarification of verification boundary conditions, acquisition content includes maximum mass flow rate of medium pressure section, continuous gas supply time, target pressure, manifold volume, gas storage cylinder volume, ambient temperature, and acquisition of rated outlet pressure and standard volume flow rate of diaphragm compressor to establish a unified verification benchmark; S2: Calculation of maximum gas consumption and conversion of standard condition volume: Based on the principle of mass conservation, the maximum gas consumption mass of a single test is calculated, and then the mass gas consumption is converted into the volume gas consumption under standard conditions. The minimum gas replenishment volume required by the system is obtained based on the most stringent test conditions, providing the core input for subsequent flow rate verification. S3: Correction for the actual gas state of high-pressure nitrogen: The van der Waals equation of state is used to correct the density and pressure of nitrogen under high-pressure conditions, eliminating the high-pressure calculation deviation caused by the ideal gas assumption and ensuring the accuracy of the calculation of the relationship between gas storage capacity, density and pressure. S4: Calculation of theoretical gas replenishment time and preliminary judgment of passability: Based on the standard gas consumption and the standard flow rate of the diaphragm compressor, calculate the theoretical gas replenishment time, and directly compare the calculated gas replenishment time with the allowable test interval time to complete the preliminary verification and judgment of the flow capacity of the diaphragm compressor. S5: Engineering Redundancy Correction and Final Verification Conclusion Output: Introducing pipeline loss, pressure fluctuation, safety margin, and engineering redundancy coefficient, the theoretical gas replenishment time is corrected, and a final verification conclusion is given based on the corrected results to ensure that the verification results meet the requirements of engineering safety and continuous test reliability.

2. The flow rate verification method for a diaphragm compressor according to claim 1, characterized in that, The specific logical steps of S1 are as follows: S101: The maximum mass flow rate is set based on the most stringent test conditions in the medium-pressure section. Longest continuous gas supply time The maximum allowable interval between two gas replenishment tests The highest target pressure in the medium-pressure section Standard ambient temperature Complete the definition of the verification boundary conditions; S102: Collect fixed structural parameters of the high-pressure nitrogen storage and supply system, including the total volume of the storage cylinders. manifold volume Calculate the total effective gas storage volume Simultaneously, nitrogen medium constant and standard density were collected. Gas constant This provides basic parameters for calculating gas consumption and gas storage. S103: Collects core operating parameters of the diaphragm compressor, including standard volumetric flow rate. Rated outlet pressure And preset the compressor overall efficiency coefficient. This is used to correct for actual operating conditions during subsequent gas replenishment time; S104: Real-time pressure of gas cylinder and manifold is collected via sensors. Real-time temperature of gas and environment The signal is filtered and error calibrated to eliminate the impact of on-site interference on the verification calculation; S105: Integrate the above-mentioned benchmark definitions, structural parameters, medium constants, compressor performance, and real-time status data to form a unified verification benchmark set. This serves as the standard input for all subsequent calculations.

3. The flow rate verification method for a diaphragm compressor according to claim 2, characterized in that, The specific logical steps of S2 are as follows: S201: Based on the maximum mass flow rate and the longest continuous gas supply time set for the experiment, calculate the total mass of nitrogen consumed during the experiment using the mass conservation formula. The calculation formula is as follows: ,in This represents the maximum gas consumption in a single test. This represents the maximum test mass flow rate in the medium-pressure section. This is the longest duration of constant pressure gas supply; S202: Using the standard density of nitrogen, the mass of gas consumed is converted into the volumetric gas consumption at standard conditions of 0℃ and 101.325kPa, which serves as the direct basis for the gas supply to the diaphragm compressor. The conversion formula is as follows: ,in This refers to the gas volume consumed in a single test under standard conditions. This represents the maximum gas consumption in a single test. This refers to the standard density of nitrogen. S203: The standard volumetric gas consumption is used as the minimum replenishment volume required by the diaphragm compressor and output to the subsequent flow verification module to ensure that the verification benchmark is consistent and the calculation is traceable.

4. The flow rate verification method for a diaphragm compressor according to claim 3, characterized in that, The specific logical steps of S3 are as follows: S301: To address the significant deviation between nitrogen and an ideal gas under high-pressure conditions, the van der Waals equation is introduced to realistically describe the gas state. The formula is as follows: ; in The absolute pressure of nitrogen gas. The specific volume of nitrogen is given. This is the van der Waals correction constant for nitrogen. R is the van der Waals correction constant for nitrogen, R is the nitrogen gas constant, and T is the thermodynamic temperature. S302: Calculate van der Waals constants a and b based on nitrogen critical state parameters to adapt the equations to nitrogen medium. Nitrogen critical state parameters include the nitrogen critical temperature. Critical pressure The formula used is: ,in The critical specific volume of nitrogen; S303: At standard verification temperature Below, the true density of nitrogen gas in the range of 5 MPa to 30 MPa is calculated using the real gas equation. And the relationship between density and specific volume is ,in The specific volume of nitrogen under high pressure; S304: Total volume of combined gas cylinder and manifold The effective gas storage capacity of the system is calculated using the true density, and the actual gas volume is corrected using the following correction formula: ,in This represents the actual effective gas storage capacity of the system. This represents the true density of high-pressure nitrogen. This refers to the total effective volume of the gas cylinder and manifold. S305: Organizes the corrected pressure, density, and gas storage data into a unified state dataset, replacing the ideal gas calculation results, and providing high-precision input for gas replenishment time verification.

5. The flow rate verification method for a diaphragm compressor according to claim 4, characterized in that, The specific logical steps of S4 are as follows: S401: Based on the gas consumption volume and compressor volumetric flow rate under standard conditions, calculate the theoretical gas replenishment time without considering any losses. The calculation formula is as follows: ,in This is the theoretical gas injection time for the diaphragm compressor. This represents the gas consumption volume under standard conditions for a single test. This refers to the standard volumetric flow rate of the diaphragm compressor. S402: Considering compressor start-up and shutdown, pressure build-up, and pipeline charging and discharging losses, a comprehensive efficiency coefficient is introduced to correct the theoretical time, resulting in the actual gas replenishment time in the project. The calculation formula is as follows: ,in The actual gas replenishment time should take into account efficiency losses. This refers to the purely theoretical time for replenishing Qi. The overall operating efficiency coefficient of the diaphragm compressor; S403: Compare the calculated actual gas replenishment time with the system's maximum allowable test interval to complete the preliminary qualification check of the flow capacity. The judgment rule is as follows: ,in This refers to the actual time for replenishing Qi. The upper limit of the allowable gas replenishment interval for continuous testing; S404: Output the theoretical gas replenishment time, actual gas replenishment time, comparison results, and qualification conclusion in a unified manner, as the basis for subsequent redundancy correction and final verification.

6. The flow rate verification method for a diaphragm compressor according to claim 5, characterized in that, The specific logical steps of S5 are as follows: S501: Introduces an engineering redundancy factor to provide safety compensation for the actual gas replenishment time, covering pipeline losses, leakage, temperature fluctuations, and test margins. The calculation formula is as follows: ,in The final verification gas replenishment time after redundancy correction. To account for the actual gas replenishment time after efficiency correction, k is the engineering redundancy coefficient; S502: Compare the final gas replenishment time after redundancy correction with the maximum allowable test interval of the system, and complete the final verification according to the judgment criteria. The judgment formula is as follows: ,in For the final verification of the gas replenishment time, To allow for the upper limit of the continuous test gas replenishment interval, the flow rate must meet the above formula to be considered qualified; otherwise, it will be considered unqualified. S503: Verify the rated discharge pressure of the diaphragm compressor to ensure that the pressure parameters simultaneously meet the system design requirements. The judgment criteria are as follows: ,in The rated discharge pressure of the diaphragm compressor. The minimum working pressure required by the system is determined by the above formula, which indicates that the pressure index is qualified. S504: Integrates flow verification results, pressure verification results, and calculation data from each stage to form the final verification conclusion, including qualification criteria, recommended selection basis, and safety margin explanation, serving as the formal basis for equipment acceptance, system debugging, and solution verification.

7. A flow verification system for a diaphragm compressor, used to implement the method described in any one of claims 1-6, characterized in that, It includes a data acquisition module, a gas consumption calculation module, a flow verification module, a redundancy correction module, a human-machine interaction module, and a PLC communication module; The data acquisition module is connected to the test system sensors and the diaphragm compressor. The test system sensors include a gas cylinder pressure transmitter, a manifold pressure transmitter, a temperature sensor, and a diaphragm compressor controller. The data acquisition module is used to synchronously transmit the collected pressure, temperature, flow rate, volume, and compressor parameters to the gas consumption calculation module. The gas consumption calculation module is used to perform mass conservation and actual gas equation calculations. The flow verification module is used to perform gas replenishment time calculation and qualification judgment, and sends the verification results to the human-machine interface for display and storage. The redundancy correction module is used to perform engineering redundancy compensation on the theoretical gas injection time, forming a closed-loop correction and verification. The human-computer interaction module is used for parameter configuration, verification process monitoring, result display, report generation, and historical data query. The PLC communication module is used to realize the uploading of field equipment data, the issuance of remote verification commands, and the linkage monitoring of equipment status.

8. The flow verification system for a diaphragm compressor according to claim 7, characterized in that, The input terminal of the gas consumption calculation module is connected to the output terminal of the data acquisition module, the output terminal of the gas consumption calculation module is connected to the input terminal of the flow verification module, the input terminal of the redundancy correction module is connected to the output terminal of the flow verification module, the correction output terminal of the redundancy correction module is connected back to the compensation input terminal of the flow verification module to form a redundancy correction closed loop, the result output terminal of the flow verification module is connected to the human-machine interaction module, and the PLC communication module communicates bidirectionally with the data acquisition module, the diaphragm compressor, and the test system sensors to realize real-time interaction of verification data and equipment linkage control.

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