Natural gas field verification / calibration acquisition analysis system and method

Abstract

The invention discloses a natural gas field verification / calibration acquisition and analysis system and method. The system comprises a multi-parameter recognizer, an acquisition system terminal, a standard device and a detected instrument. The multi-parameter identifier and the acquisition system terminal are wirelessly networked; the multi-parameter identifier is connected with the standard device and the detected instrument; the multi-parameter recognizer is used for automatically acquiring verification or calibration process information; the multi-parameter recognizer comprises a central controller MCU and a circuit module. The circuit module is used for data acquisition, and the central controller MCU is used for processing the acquired data. The multi-parameter identifier and the acquisition system terminal are wirelessly networked, and the multi-parameter identifier is in wired connection with the etalon and the detected instrument, so that the calibration or calibration process information is automatically obtained, the complexity of manual acquisition of the calibration or calibration process information is reduced, and bias errors in the data circulation process are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas detection, and particularly relates to a natural gas on-site verification / calibration acquisition and analysis system and method. Background Art

[0002] During the transportation of natural gas, in order to understand the transportation state of natural gas, it is necessary to set up metering devices on the natural gas transportation pipeline to measure and record the transportation pressure, temperature, flow rate, etc. of natural gas, and regularly verify these measuring instruments according to relevant regulations to ensure the accuracy of the measuring instruments and the reliability of the measured data.

[0003] Common pressure measurement systems in natural gas stations: include pressure (differential pressure) transmitters, isolators, ADC conversion modules, and related connection circuits, metering systems and other secondary instruments; temperature measurement systems: include temperature sensors (platinum resistors) or integrated temperature transmitters, temperature transmitters (isolators), ADC conversion modules, and related connection circuits, metering systems and other secondary instruments.

[0004] The prior art provides relevant verification / calibration equipment for pressure measurement and temperature measurement: including but not limited to digital pressure gauges, process calibrators, air pumps, resistance boxes, and supporting connectors and connecting wires, etc.

[0005] The inventor found that the prior art has at least the following technical problems:

[0006] When verifying or calibrating the pressure and temperature measurement systems, there are factors such as the information of the standard devices for verification and calibration and the information of the equipment to be inspected relying on manual transcription, the large workload of manual recording of process data, easy occurrence of errors and omissions, large data processing calculations, and difficult uncertainty evaluation, resulting in problems such as a long cycle for issuing records and certificates. Summary of the Invention

[0007] The technical problem to be solved by the present invention is that when verifying or calibrating the pressure and temperature measurement systems, errors and omissions are easily generated during verification or calibration, the data processing calculation is large, and the accuracy is poor. The purpose is to provide a natural gas on-site verification / calibration acquisition and analysis system and method. Through wireless networking of the multi-parameter identifier and the acquisition system terminal, and wired connection of the multi-parameter identifier with the standard device and the instrument under test, it automatically obtains the information of the verification or calibration process, reduces the cumbersome manual acquisition of the verification or calibration process information, avoids errors in the data transfer process, and breaks through the technical bottlenecks of error calculation and uncertainty evaluation.

[0008] The present invention is achieved by the following technical solutions:

[0009] The first aspect of the present invention provides a natural gas on-site verification / calibration acquisition and analysis system, including a multi-parameter identifier, an acquisition system terminal, a standard device, and an instrument under test;

[0010] The multi-parameter identifier and the acquisition system terminal are wirelessly networked;

[0011] The multi-parameter identifier is connected to the standard device and the instrument under test;

[0012] The multi-parameter identifier is used to automatically obtain the information of the verification or calibration process;

[0013] The multi-parameter identifier includes a central controller MCU and a circuit module;

[0014] The circuit module is used for data acquisition, and the central controller MCU is used for processing the acquired data.

[0015] In the present invention, the multi-parameter identifier and the acquisition system terminal are wirelessly networked, and the multi-parameter identifier is wired-connected to the standard device and the instrument under test, so that it automatically obtains the information of the verification or calibration process, and the system terminal is used to form the original data record by configuring the data according to the relevant regulations, and then automatically forms the verification or calibration certificate through the logical calculation formula. It reduces the tediousness of manual acquisition of the verification or calibration process information, avoids errors in the data transfer process, and breaks through the technical bottlenecks of error calculation and uncertainty evaluation.

[0016] Further, the circuit module includes a power supply module, a display module and a communication module;

[0017] The communication module includes LORA communication protocol, Hart communication protocol, Wifi communication protocol and RS232 communication protocol;

[0018] The LORA communication protocol is used for wireless networking and transparent transmission of collected information;

[0019] The Hart communication protocol is used for collecting the basic information of the instrument under test with Hart function;

[0020] The Wifi communication protocol is used for collecting the information of the verification standard device that can only transmit information wirelessly;

[0021] The RS232 communication protocol is used for collecting information of the verification standard device with an RS232 interface.

[0022] The second aspect of the present invention provides a natural gas on-site verification / calibration acquisition and analysis method applied to a natural gas on-site verification / calibration acquisition and analysis system, including the following specific steps:

[0023] Obtain the verification task and the startup sequence of the multi-parameter identifier;

[0024] The acquisition system terminal matches the verification task according to the startup sequence of the multi-parameter identifier;

[0025] Determine the verification task matching situation of the multi-parameter identifier according to the current verification task type, and generate a matching record;

[0026] Obtain the corresponding protocols adopted by the standard device and the instrument under test. Based on the protocols, the central controller MCU uses the communication module to obtain the data of the instrument under test;

[0027] The acquisition system terminal performs a first error calculation on the data, and judges whether the performance of the instrument meets the requirements according to the error setting threshold.

[0028] Furthermore, the acquisition system terminal performs a first error calculation on the data, which specifically includes:

[0029] The acquisition system terminal calculates the indication error, hysteresis error and tapping displacement during the certificate generation;

[0030] Obtain the accuracy class data of the instrument under test, compare the calculated indication error, hysteresis error and tapping displacement with the accuracy class data of the instrument under test, and obtain the instrument performance.

[0031] Furthermore, the indication error is the difference between the measured value and the standard value, the hysteresis error is the difference between the upstroke output value and the downstroke output value corresponding to the same standard value, and the maximum allowable error is the product of the accuracy class and the measurement range.

[0032] The third aspect of the present invention provides a natural gas on-site calibration acquisition and analysis method applied to a natural gas on-site verification / calibration acquisition and analysis system, including the following specific steps:

[0033] Obtain the verification task and the start sequence of the multi-parameter identifier;

[0034] The acquisition system terminal matches the calibration task according to the start sequence of the multi-parameter identifier;

[0035] Determine the calibration task matching situation of the multi-parameter identifier according to the current calibration task type, and generate a matching record;

[0036] Set the calibration points. When the standard device provides the signal of the set points, the acquisition system terminal reads the acquisition data;

[0037] The acquisition system terminal performs a second error calculation on the data, and judges whether the performance of the instrument meets the requirements according to the error setting threshold.

[0038] Furthermore, the acquisition system terminal performs a second error calculation on the data, which specifically includes:

[0039] Obtain the repeatability and the maximum allowable error MPE of the standard device, or the accuracy class of the standard device as an uncertainty component;

[0040] The terminal of the acquisition system calculates the expanded uncertainty according to the uncertainty components during certificate generation.

[0041] Furthermore, the steps of calculating the expanded uncertainty according to the uncertainty components include:

[0042] The type A uncertainty component introduced by repeatability, the standard uncertainty u A

[0043] The type B uncertainty component introduced by the MPE and accuracy class of the standard device, or directly citing the uncertainty of the calibration certificate of the standard device, the standard uncertainty u B

[0044] According to the standard uncertainty u A and the standard uncertainty u B , the uncertainty is obtained.

[0045] Furthermore, the specific steps of the uncertainty calculation include:

[0046]

[0047]

[0048]

[0049] where A i represents the i-th measured value, represents the average value of n measured values, i = 1, 2, 3,..., n, MPE represents the maximum allowable error of the standard device, and k represents the coverage factor.

[0050] Furthermore, during the acquisition or transmission of the multi-parameter identifier, the acquired data is also encrypted. The encryption uses the MD5 information digest algorithm. The MD5 information digest algorithm specifically includes: constructing a cryptographic hash function to generate a 128-bit hash value to ensure the integrity and consistency of information transmission.

[0051] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0052] In the present invention, the multi-parameter identifier and the terminal of the acquisition system are wirelessly networked, and the multi-parameter identifier is wiredly connected to the standard device and the device under test, enabling it to automatically obtain the information of the verification or calibration process, and realizing the formation of the original data record by configuring the data according to the relevant regulations through the system terminal, and then automatically forming the verification or calibration certificate through the logical calculation formula. It reduces the cumbersome manual acquisition of information in the verification or calibration process, avoids errors in the data transfer process, and breaks through the technical bottlenecks of error calculation and uncertainty evaluation;

[0053] The system and method provided by the present invention can assist operators in quickly implementing and completing the verification and calibration of on-site temperature and pressure instruments. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings. In the drawings:

[0055] Figure 1 is a schematic diagram of the natural gas on-site verification / calibration acquisition and analysis system provided by an embodiment of the present invention;

[0056] Figure 2 is a schematic diagram of the natural gas on-site verification / calibration multi-parameter identifier provided by an embodiment of the present invention;

[0057] Figure 3 is a schematic diagram of the verification of a natural gas pressure measuring instrument provided by an embodiment of the present invention;

[0058] Figure 4 is a schematic diagram of the calibration of a natural gas pressure and temperature measurement system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0059] To make the objectives, technical solutions, and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below in combination with the embodiments and the drawings. The illustrative embodiments of the present invention and their descriptions are only used to explain the present invention and are not intended to limit the present invention.

[0060] As a possible embodiment, as Figure 1As shown in the figure, this embodiment provides a natural gas on-site verification / calibration acquisition and analysis system, including a multi-parameter identifier, an acquisition system terminal, a standard device, and an instrument under test; the multi-parameter identifier and the acquisition system terminal are wirelessly networked; the multi-parameter identifier is connected to the standard device and the instrument under test; the multi-parameter identifier is used to automatically obtain the information of the verification or calibration process; the multi-parameter identifier includes a central controller MCU and a circuit module arranged on a printed circuit board (Printed Circuit Board, abbreviated as PCB); the circuit module is used for data acquisition, and the central controller MCU is used for processing the acquired data. Through the wireless networking of the multi-parameter identifier and the acquisition system terminal, and the wired connection of the multi-parameter identifier with the standard device and the instrument under test, it can automatically obtain the information of the verification or calibration process, and form the original data record by configuring the data according to relevant regulations through the system terminal, and then automatically form the verification or calibration certificate through the logical calculation formula. It reduces the cumbersome manual acquisition of the verification or calibration process information, avoids errors in the data transfer process, and breaks through the technical bottlenecks of error calculation and uncertainty evaluation.

[0061] The central controller MCU selects the stm32F103x series of single-chip microcomputers, a 32-bit high-performance ARM Cortex-M3 processor, and cooperates with the acquisition system terminal to issue and execute instructions, mainly to complete the acquisition, confirmation, and transparent transmission of the basic information of the instrument under test, the standard device for verification / calibration, etc. and the data of the verification / calibration process.

[0062] As Figure 2 shown in the figure, the circuit module includes a power supply module, a display module, and a communication module; the power supply module is powered by an explosion-proof 7.4V / 10A / h lithium battery, including a 7.4V to 5V circuit, a 5V to 3.3V circuit, and a lithium battery charging circuit; among them, the 7.4V to 5V circuit mainly supplies power to the touch screen, the 5V to 3.3V circuit mainly supplies power to the MCU and its peripheral circuits, and the lithium battery charging circuit is used to charge the lithium battery.

[0063] The display module mainly refers to the touch screen, and the touch screen is mainly used to compile the human-machine interface (HMI) and interact with the MCU for data.

[0064] The communication module includes LORA communication protocol, Hart communication protocol, Wifi communication protocol, and RS232 communication protocol; the LORA communication protocol is mainly used for wireless networking and transparent transmission of acquired information, and its frequency coverage range is from 400MHz to 525MHz, which has a good effect on suppressing co-frequency interference. The Hart communication protocol is mainly used for collecting the basic information of the instrument under test with Hart function; the Wifi communication protocol is mainly used for collecting the information of the standard device for verification / calibration that can only transmit information through the wireless network; the RS232 communication protocol is mainly used for collecting the information of the standard device for verification / calibration with an RS232 interface.

[0065] The MD5 information digest algorithm (MD5 Message-Digest Algorithm) is adopted for the encryption method of information collection or transmission by the multi-parameter identifier. The MD5 information digest algorithm is a widely used cryptographic hash function that can generate a 128-bit (16-byte) hash value to ensure the integrity and consistency of information transmission. The program of this algorithm is specified in RFC 1321.

[0066] The on-site verification / calibration acquisition system for natural gas can be divided into two major parts: instrument verification / calibration and measurement system calibration. When conducting instrument verification / calibration, multiple sets of instruments can be verified / calibrated simultaneously for the same user. The following is a separate description.

[0067] As a possible embodiment, as Figure 3 shown, this embodiment provides a method for on-site verification and acquisition analysis of natural gas applied to the on-site verification / calibration acquisition and analysis system for natural gas. When conducting pressure instrument verification, the acquisition system terminal communicates with the multi-parameter identifier and the metering system through wireless networking. The multi-parameter identifier is wired to the standard device for verification and the instrument under test. By configuring the corresponding standard device, the pressure and differential pressure of the same user can be verified simultaneously, including the following specific steps:

[0068] Step 1: The acquisition system terminal formulates the verification plan for this time, activates the wireless networking communication with the multi-parameter identifier and the metering system, and obtains the information of the user unit (user name) and the verification location (location or station) from the metering system according to the task.

[0069] Step 2: The acquisition system terminal matches the verification tasks according to the activation sequence of the multi-parameter identifier. The identifier feeds back the matching situation through the "measurement type", and corresponding records are formed according to the number of identifiers.

[0070] Step 3: The multi-parameter identifier is wired to the standard device for verification and the instrument under test. The central controller uses the communication module to obtain the basic information of the instrument under test through the protocols corresponding to the standard device and the instrument under test, including but not limited to the name of the instrument, model, measurement range, output range, manufacturer, or number (ID number, nameplate number), and sends the obtained information to the acquisition system terminal to complete the filling of the basic instrument information in the corresponding record.

[0071] Step 4: The central controller MCU of the identifier sets the calibration points according to relevant regulations. The communication module of the identifier is compatible with the protocol of the standard device for calibration and collects the standard pressure value and the corresponding output value to be inspected (pressure value or current value). For example, for a pressure gauge, it includes the standard pressure value, the indicated value to be inspected after tapping, the tapping displacement, etc. according to JJG 52 "Elastic Element General Pressure Gauge, Pressure Vacuum Gauge and Vacuum Gauge"; for a pressure (differential pressure) transmitter, it includes the pressure value, output current value, and measured current value according to JJG 882.

[0072] Step 5: The multi-parameter identifier transmits the information collected in the previous step to the terminal of the acquisition system, and the terminal of the acquisition system configures it to the corresponding record.

[0073] Step 6: The terminal of the acquisition system calculates the indication error, hysteresis error, and tapping displacement according to the regulations of JJG 882, JJG 52, etc. during the certificate generation, compares them with the accuracy class of the instrument to be inspected, and judges whether the performance of the instrument meets the requirements. Specifically, the terminal of the acquisition system calculates the indication error, hysteresis error, and tapping displacement during the certificate generation. Specifically, it obtains the accuracy class data of the instrument to be inspected, compares the calculated indication error, hysteresis error, and tapping displacement with the accuracy class data of the instrument to be inspected to obtain the instrument performance. The indication error is the difference between the measured value and the standard value, the hysteresis error is the difference between the upstroke output value and the downstroke output value corresponding to the same standard value, and the maximum allowable error is the product of the accuracy class and the measurement range.

[0074] As a possible embodiment, as Figure 4 shown, this embodiment provides a natural gas on-site calibration acquisition and analysis method applied to a natural gas on-site calibration / verification acquisition and analysis system. When performing isolator calibration, temperature transmitter calibration, and loop joint calibration, the terminal of the acquisition system communicates with the multi-parameter identifier and the metering system through wireless networking, and the multi-parameter identifier is wired to the standard device for calibration. By configuring the corresponding standard device, the pressure loop, differential pressure loop, temperature loop, isolator, and temperature transmitter of the same user can be calibrated simultaneously, including the following specific steps:

[0075] Step 1: The terminal of the acquisition system formulates the current calibration plan, starts the wireless networking communication with the multi-parameter identifier and the metering system, obtains the information of the user unit (user name) and calibration location (location or station) from the metering system according to the task, and screens and obtains the information such as the manufacturer, measurement range, input and output ranges of the current instrument to be inspected from the metering instrument ledger of the terminal of the acquisition system.

[0076] Step 2: The terminal of the acquisition system matches the calibration tasks according to the startup sequence of the multi-parameter identifier. The identifier feeds back the matching situation through the "measurement type" and forms corresponding records according to the number of multi-parameter identifiers.

[0077] In Step 3, the acquisition system terminal sets calibration points according to relevant standards or specification requirements. The multi-parameter identifier is connected to the calibration standard device by wire. When the standard device provides signals of the set points (including pressure standard values, current signals, and resistance signals), the multi-parameter identifier sends an instruction to the acquisition system terminal by feedback of "reading the metering system value", and the acquisition system terminal executes the instruction to read the current output information (including pressure value, temperature value, current signal, and voltage signal) from the metering system.

[0078] In Step 4, the acquisition system terminal configures the above information into the corresponding record.

[0079] In Step 5, the acquisition system terminal calculates the indication error and expanded uncertainty according to JJF 1183 and Q / SY XN0179 during certificate generation, compares them with the provisions in the standard, and determines whether the instrument performance meets the requirements.

[0080] Among them, the specific evaluation of the expanded uncertainty includes: for isolators, temperature transmitters, and loop joint calibration, since the input is provided by standard equipment and the output directly reads the system value, the repeatability and the maximum allowable error (MPE) of the standard device or the accuracy class of the standard device are mainly used as uncertainty components for evaluation. The components with little influence from resolution and A / D / C conversion can be ignored, and the uncertainty evaluation is as follows:

[0081] Obtain the repeatability and the maximum allowable error MPE of the standard device, or the accuracy class of the standard device as the uncertainty component; the acquisition system terminal calculates the expanded uncertainty according to the uncertainty component during certificate generation; the type A uncertainty component introduced by repeatability, the standard uncertainty u A ; the type B uncertainty component introduced by the MPE and accuracy class of the standard device, or directly quote the uncertainty of the standard device calibration certificate, the standard uncertainty u B ; according to the standard uncertainty u A and the standard uncertainty u B , obtain the uncertainty.

[0082] The specific steps for uncertainty calculation include:

[0083]

[0084]

[0085]

[0086] Among them, A i represents the i-th measured value, represents the average value of n measured values, i = 1, 2, 3,..., n, MPE represents the maximum allowable error of the standard device, and k is the coverage factor (k = 1, 2, 3, here only take the value 2).

[0087] The specific embodiments described above further elaborate on the purpose, technical solutions, and beneficial effects of the present invention. It should be understood that the above description is only the specific embodiments of the present invention and is not used to limit the protection scope of the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A natural gas on-site verification / calibration acquisition and analysis system, characterized in that, it includes a multi-parameter identifier, an acquisition system terminal, a standard device, and an instrument under test; the multi-parameter identifier and the acquisition system terminal are wirelessly networked; the multi-parameter identifier is connected to the standard device and the instrument under test; the multi-parameter identifier is used to automatically obtain verification or calibration process information; the multi-parameter identifier includes a central controller MCU and a circuit module; the circuit module is used for data acquisition, and the central controller MCU is used for processing the acquired data.

2. The natural gas on-site verification / calibration acquisition and analysis system according to claim 1, characterized in that, the circuit module includes a power module, a display module, and a communication module; the communication module includes LORA communication protocol, Hart communication protocol, Wifi communication protocol, and RS232 communication protocol; The LORA communication protocol is used for wireless networking and transparent transmission of acquired information; The Hart communication protocol is used for acquiring basic information of the instrument under test with Hart function; The Wifi communication protocol is used for acquiring information of the verification standard device that can only transmit information wirelessly; The RS232 communication protocol is used for acquiring information of the verification standard device with an RS232 interface.

3. A natural gas on-site verification acquisition and analysis method applied to the natural gas on-site verification / calibration acquisition and analysis system according to any one of claims 1-2, characterized in that, it includes the following specific steps: Obtain the verification task and the startup sequence of the multi-parameter identifier; The acquisition system terminal matches the verification task according to the startup sequence of the multi-parameter identifier; According to the current verification task type, determine the verification task matching situation of the multi-parameter identifier and generate a matching record; Obtain the corresponding protocols adopted by the standard device and the instrument under test. Based on the protocols, the central controller MCU uses the communication module to obtain the data of the instrument under test; The acquisition system terminal performs a first error calculation on the data and judges whether the instrument performance meets the requirements according to the error setting threshold.

4. The natural gas on-site verification acquisition and analysis method according to claim 3, characterized in that, the acquisition system terminal performs a first error calculation on the data, specifically including: The acquisition system terminal calculates the indication error, hysteresis error, and light tap displacement during certificate generation; Obtain the accuracy class data of the instrument under test, and compare the calculated indication error, hysteresis error, and light tap displacement with the accuracy class data of the instrument under test to obtain the instrument performance.

5. The natural gas on-site verification acquisition and analysis method according to claim 4, characterized in that, the indication error is the difference between the measured value and the standard value, the hysteresis error is the difference between the upstroke output value and the downstroke output value corresponding to the same standard value, and the maximum allowable error is the product of the accuracy class and the measurement range.

6. A natural gas on-site calibration acquisition and analysis method applied to the natural gas on-site verification / calibration acquisition and analysis system according to any one of claims 1-2, characterized in that, it includes the following specific steps: Obtain the verification task and the startup sequence of the multi-parameter identifier; The acquisition system terminal matches the calibration task according to the startup sequence of the multi-parameter identifier; Determine the calibration task matching situation of the multi-parameter identifier according to the current calibration task type, and generate a matching record; Set calibration points. When the standard device provides signals at the set points, the acquisition system terminal reads the acquisition data; The acquisition system terminal performs a second error calculation on the data, and judges whether the instrument performance meets the requirements according to the error setting threshold.

7. The on-site calibration acquisition and analysis method for natural gas according to claim 6, characterized in that, The second error calculation performed by the acquisition system terminal on the data specifically includes: Obtain the repeatability and the maximum allowable error MPE of the standard device, or the accuracy level of the standard device as the uncertainty component; The acquisition system terminal calculates the expanded uncertainty according to the uncertainty component during certificate generation.

8. The on-site calibration acquisition and analysis method for natural gas according to claim 7, characterized in that, The steps of calculating the expanded uncertainty according to the uncertainty component include: A-type uncertainty component introduced repeatedly, standard uncertainty u A The B - type uncertainty component introduced by the MPE of the standard device and the accuracy class, or directly quoting the uncertainty of the calibration certificate of the standard device, the standard uncertainty u B According to the standard uncertainty u A and the standard uncertainty u B , the uncertainty is obtained.

9. The on-site calibration acquisition and analysis method for natural gas according to claim 8, characterized in that, The uncertainty calculation steps specifically include: or Among them, A i represents the i-th measured value, represents the average value of n measured values, i = 1, 2, 3,..., n, MPE represents the maximum allowable error of the standard device, and k represents the coverage factor.

10. The on-site calibration acquisition and analysis method for natural gas according to claim 5 or 9, characterized in that, During the acquisition or transmission of the multi-parameter identifier, the acquisition data is also encrypted. The encryption uses the MD5 information digest algorithm. The MD5 information digest algorithm specifically includes: constructing a cryptographic hash function to generate a 128-bit hash value to ensure the integrity and consistency of information transmission.

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