CN116698162A - Gas flow error checking system, testing method thereof and gas meter error checking method - Google Patents
Gas flow error checking system, testing method thereof and gas meter error checking method Download PDFInfo
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The application discloses a gas flow error checking system, a testing method thereof and a gas meter error checking method, wherein the gas flow error checking system comprises: the gas supply gas circuit comprises a flow rough adjustment gas circuit and a flow fine adjustment gas circuit which are arranged in parallel; a first stop valve and a first flow regulating valve are arranged on the flow coarse regulating gas path; the flow fine-tuning gas circuit comprises a pressure stabilizing buffer tank serving as a gas source, a third stop valve and a micro-flow regulating valve, wherein the third stop valve and the micro-flow regulating valve are arranged on the gas circuit; the pressure stabilizing buffer tank is connected with a vacuum pump, and a second emptying valve and a fourth pressure sensor are also arranged on the pressure stabilizing buffer tank; a stagnation container is arranged on the gas recovery gas path; the gas meter detection section includes: the device comprises a detection interface, a standard flowmeter and a pressure sensor. The gas flow error checking system realizes the integrated functions of flow accurate adjustment, error data calculation and upper computer control, and has high accuracy of checking results.
Description
Technical Field
The application relates to the technical field of gas meter verification devices, in particular to a gas flow error verification system, a flow error verification device and an error verification method.
Background
Because the natural gas and other solid gas media are directly adopted as experimental gas for experiments, the problems of high risk and high cost exist, and the high explosion-proof requirement is provided for a laboratory. Therefore, at present, most of the meters are tested by taking an air medium as an experimental condition and adopting a sonic nozzle method gas flow standard device for testing, the device is obtained by detecting temperature and pressure values in the device and substituting the temperature and pressure values into a corresponding formula, and the device is widely applied to various gas meter tests, such as industries of positive displacement diaphragm gas meters, roots flowmeters and the like, but the device cannot adopt natural gas as the medium and is difficult to meet the safety requirement.
However, the error verification device adopting the air medium to replace the real air is not suitable for the rapid-development speed ultrasonic gas meter, and large errors and uncertainty can be introduced into the detection result; in the testing process of the ultrasonic gas meter, the air and the real gas can cause the changes of viscosity, density, acoustic attenuation, sound velocity, and other different physical quantities due to the change of the medium, and then the change of a speed field in a measuring pipe section can be influenced, so that the judgment of the measurement error of the real gas medium such as the natural gas is greatly influenced.
In addition, the gas flow regulation precision of the existing gas meter verification equipment needs to be improved, the detectable flow range is insufficient to meet various gas meters, and the application range is limited.
Thus, the prior art is still to be further developed.
Disclosure of Invention
Aiming at the technical problems, the application provides a gas flow error checking system, a testing method thereof and a gas meter error checking method.
In order to solve the problems, the application provides the following technical scheme:
in a first aspect, the present application provides a gas flow error checking system comprising: the gas supply gas circuit comprises a flow rough adjustment gas circuit and a flow fine adjustment gas circuit which are arranged in parallel;
the flow rough regulating air path takes an air bottle with a pressure reducing valve as an air source, and a first stop valve and a first flow regulating valve are arranged on the air path; the flow fine-tuning gas circuit comprises a pressure stabilizing buffer tank serving as a gas source, a third stop valve and a micro-flow regulating valve, wherein the third stop valve and the micro-flow regulating valve are arranged on the gas circuit;
the pressure stabilizing buffer tank is connected with an air bottle through a fifth stop valve, is connected with a vacuum pump, and is also provided with a second emptying valve and a fourth pressure sensor; a stagnation container is arranged on the gas recovery gas path;
the gas meter detection section includes: the device comprises a detection interface for installing a detection gas meter table, and corresponding standard flow meters and pressure sensors arranged on the upstream and downstream of the detection interface.
Preferably, in the gas flow error checking system, the gas cylinder is a natural gas cylinder.
Preferably, in the gas flow error checking system, a fourth stop valve is arranged at the gas outlet end of the stagnation container and is connected with the pressure stabilizing buffer tank; the air inlet end of the stagnation container is provided with a second stop valve, and the stagnation container is provided with a first emptying valve.
Preferably, in the gas flow error checking system, the stagnation container is connected with a water tank through a booster pump, a drain pipe communicated with the water tank is further arranged on the stagnation container, and a sixth stop valve is arranged on the drain pipe.
Preferably, in the gas flow error checking system, the gas cylinder connected with the pressure stabilizing buffer tank is a gas cylinder in a coarse flow adjusting gas path, and the gas cylinder are connected through a fifth stop valve; the surge tank is also directly or indirectly connected to a booster pump.
Preferably, the stop valve adopts a ball valve; the pressure reducing valve arranged on the gas cylinder is a secondary pressure reducing valve.
Preferably, a first labeling flowmeter is arranged at the upstream of the detection interface, a second standard flowmeter is arranged at the downstream of the detection interface, a first sensor is arranged at the downstream of the first labeling flowmeter, and a second pressure sensor and a third pressure sensor are arranged at the upstream and downstream of the second standard flowmeter.
Preferably, the gas flow error checking system further comprises a central control module for analysing and calculating data collected by the standard flow meter and the pressure sensor, the standard flow meter and the pressure sensor being arranged to transmit relevant real-time data to the central control module.
In a second aspect, the present application provides a method of testing a gas flow error checking system, operating from one of two flow testing methods:
(1) The small flow test method comprises the following steps:
operating related stop valves and vacuum pumps to empty the gas in the pressure stabilizing buffer tank, the stagnation container tank body and the whole pipeline;
s11, opening a pressure reducing valve and a fifth stop valve to enable the gas cylinder to convey experimental gas for the pressure stabilizing buffer tank, and closing the fifth stop valve when the pressure in the pressure stabilizing buffer tank reaches an experimental pressure value to maintain the pressure in the pressure stabilizing buffer tank stable;
s12, closing the first stop valve, opening the third stop valve and the micro-flow regulating valve, opening the flow fine-tuning gas circuit, and simultaneously opening the second stop valve to recover the gas in the gas circuit into the stagnation container, and realizing fine tuning of the gas flow in the gas circuit by operating the micro-flow regulating valve;
(2) The high flow test method comprises the following steps:
s21, enabling the gas cylinder to convey experimental gas for the pressure stabilizing buffer tank, wherein the gas pressure in the pressure stabilizing buffer tank is not less than the gas pressure processed by the secondary pressure reducing valve of the flow rough adjusting gas circuit (namely, the P stability is more than or equal to P reduction);
s22, opening a second-stage pressure reducing valve, a first stop valve, a first flow regulating valve, a third stop valve and a micro-flow regulating valve to enable a flow rough adjusting gas path and a flow fine adjusting gas path to serve as gas sources to provide gas flows, and simultaneously opening a second stop valve to enable the gas to be recovered by a stagnation container; coarse adjustment of the air path flow is achieved through the first flow regulating valve, and accurate adjustment of the air path flow is achieved through the micro flow regulating valve.
Preferably, the testing method of the gas flow error checking system further comprises the following method for medium flow testing:
(3) The medium flow test method comprises the following steps:
s31, opening a second-stage pressure reducing valve, a first stop valve and a first flow regulating valve to enable the flow rough adjusting gas paths to serve as gas sources to provide gas flow, and simultaneously opening a second stop valve to enable the gas to be recovered by a stagnation container; coarse adjustment of the air path flow is achieved through a first flow adjusting valve;
alternatively, the operations are performed using the methods of S21 and S22 described above.
In a third aspect, the present application also provides a method for calibrating flow errors of a gas meter, comprising the following steps:
s41, connecting n gas meters to be detected to a detection interface in a serial mode, wherein flow readings of the gas meters to be detected are respectively as follows in sequence: G. g, G … G n The method comprises the steps of carrying out a first treatment on the surface of the n represents the total number of gas meters to be tested in series, and n is more than or equal to 1;
s42, after the flow rate is adjusted by adopting the testing method, the following data are collected: detecting a value Q of a first standard flow meter arranged on the upstream side of the interface, a value P of a first pressure sensor arranged on the downstream side of the first standard flow meter, a value Q of a second standard flow meter arranged on the downstream side of the interface, a value P of a second pressure sensor arranged on the upstream side of the second standard flow meter and a value P of a third pressure sensor;
s43, calculating a standard flow value according to the following formula I:
Q label (C) = (α×q1+q2×p3/p1)/(1+α), wherein 0.7+.ltoreq.α+.1;
and calculating a single table pressure drop value according to the following formula II:
P lowering blood pressure =（P-P）/n；
S44, calculating the following formula III to calculate the standard flow value of the gas meter to be measured:
G m label =Q Label (C) *P/(P-mP Lowering blood pressure )；
S45, calculating the indication error of each gas meter to be detected according to the following formula IV based on the standard flow value obtained in the steps, so as to judge whether the gas meter to be detected meets the standard;
E m =（G m -G m label ）/G m label The method comprises the steps of carrying out a first treatment on the surface of the Wherein m is the serial number of the gas meter.
Preferably, data acquisition is started 3-5 minutes before the experimental process is started, and the verification quantity is set according to the flow value.
The gas flow error checking system and the testing method thereof and the gas meter error checking method provided by the application have the following beneficial effects:
1. the flow regulation of the gas flow error checking system adopts a common regulation mode of a main circuit and a branch circuit, the pressure of the pressure stabilizing buffer tank is more stable, and the flow joint regulation precision is higher; the integrated flow control device realizes the integrated functions of flow precise adjustment, error data calculation and upper computer control, and has high accuracy of verification results.
2. The gas meter flow error verification method is based on an accumulated flow average error method, can realize synchronous same-frequency data acquisition of the standard flow meter and the measured meter, and reduces instantaneous flow error measurement brought by flow fluctuation.
3. The flow error verification system and the error verification method adopt a double-standard gauge pressure loss analysis calibration method, bring the pipeline pressure loss into standard flow value calculation, and realize independent calculation of the indication value error of each to-be-detected gauge; the central control module can collect signals at the same frequency at the same time, so that error verification of a plurality of gas meters is synchronously realized, and verification working efficiency is high; in addition, the system test error generated by introducing flow pulsation to the initial end switching valve is reduced by a middle section acquisition mode, and the measurement accuracy is improved.
4. The gas flow error checking system has various functions, and can reasonably select single use or combined use of the flow coarse adjustment gas circuit and the flow fine adjustment gas circuit based on different flow precision requirements and flow size requirements.
Drawings
FIG. 1 is a schematic diagram of a gas flow error checking system according to embodiment 1;
FIG. 2 is a schematic diagram of the first usage status of the gas flow error checking system of embodiment 1;
FIG. 3 is a schematic diagram of a second usage status of the gas flow error checking system of embodiment 1;
FIG. 4 is a schematic diagram of the gas flow error checking system of embodiment 2;
FIG. 5 is a schematic diagram of the gas flow error checking system of embodiment 3;
wherein reference numerals are as follows:
the device comprises a flow rough adjusting gas circuit 1, a gas cylinder 11, a first stop valve 12, a first flow regulating valve 13, a flow fine adjusting gas circuit 2, a pressure stabilizing buffer tank 21, a third stop valve 22, a micro flow regulating valve 23, a vacuum pump 24, a second emptying valve 25, a fourth pressure sensor 26 and a fifth stop valve 27; the gas recovery gas circuit 3, the stagnation vessel 31, the first purge valve 311, the second shutoff valve 32, the fourth shutoff valve 33, the booster pump 34, the water tank 35, the sixth shutoff valve 36, the gas meter detection unit 4, the detection port 41, the first standard flow meter 42, the first pressure sensor 43, the second standard flow meter 44, the second pressure sensor 45, and the third pressure sensor 46.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to fall within the scope of the application. It will be understood that when an element is referred to as being "fixed" to another element, it can be directly on the other element or one or more intervening elements may be present therebetween. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or one or more intervening elements may be present therebetween. The terms indicating orientation or positional relationship used in the present specification are based on the orientation or positional relationship shown in the drawings, and are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element in question must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be construed as limiting the application. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and/or" as used in this specification includes any and all combinations of one or more of the associated listed items. In addition, the technical features of the different embodiments of the present application described below may be combined with each other as long as they do not collide with each other.
Example 1
In one aspect, as shown in fig. 1, the present embodiment provides a gas flow error checking system, which includes: the gas supply gas circuit, gas meter detection portion 4 and gas recovery gas circuit 3 that establish ties in proper order with the gas supply gas circuit, the gas supply gas circuit includes the flow coarse adjustment gas circuit 1 and the flow fine setting gas circuit 2 of parallelly connected setting.
The gas meter detection section includes: a test interface 41 for mounting a test gas meter, and corresponding standard flow meters and pressure sensors both upstream and downstream of the test interface. The gas flow error checking system can be used for checking flow errors of a gas meter to be detected (such as an ultrasonic flowmeter) arranged at the detection interface.
The rough flow regulating air path 1 takes a gas cylinder 11 provided with a pressure reducing valve as an air source, and a first stop valve 12 and a first flow regulating valve 13 (namely a rough flow regulating valve) are arranged on the air path.
The flow fine-tuning gas circuit 2 comprises a surge tank 21 as another gas source, a third stop valve 22 and a micro-flow regulating valve 23 which are arranged on the gas circuit.
Among the above-mentioned two flow control valves, the regulating range of the first flow control valve who is connected with the gas cylinder is big, plays coarse adjusting's effect, and little flow control valve flow control scope is little, but the precision is higher, can carry out the fine setting of gas circuit air current as the branch road, through the joint cooperation of above-mentioned two flow control valves, can satisfy the wide range and the fine setting accuracy requirement of gas circuit flow control simultaneously.
Meanwhile, in order to perform vacuum pressure regulation on the surge tank 21, the surge tank is connected with a vacuum pump 24. The surge tank 21 is further provided with a second evacuation valve 25 for evacuating the internal gas and a fourth pressure sensor 26 for detecting the pressure value in the surge tank.
In this embodiment, a stagnation container 31 for recovering gas in the gas recovery gas circuit is disposed on the gas recovery gas circuit 3, and the upstream of the stagnation container 31 is communicated with the coarse flow adjustment gas circuit 1 and the fine flow adjustment gas circuit 2 respectively through gas pipes for recovering gas in the two gas supply gas circuits.
In order to control the gas in and out of the stagnation container 31 and thus regulate the operation state thereof, the gas inlet end and the gas outlet end of the stagnation container 31 are provided with a second shut-off valve 32 and a fourth shut-off valve 33, respectively. The stagnation container 31 is provided with a first drain valve 311.
Preferably, in order to better regulate the stagnation container and pressurize the surge tank, the following settings are made:
the stagnation container 31 is connected with a water tank 35 through a booster pump 34, and the air outlet end of the stagnation container 31 is connected with the surge tank 21 through a fourth stop valve 33. The stagnation container 31 is further provided with a drain pipe communicating with the water tank, and a sixth shut-off valve 36 is provided on the drain pipe.
Before the flow rough adjusting gas circuit and the flow fine adjusting gas circuit are required to be simultaneously opened, the booster pump is started to inject water into the stagnation container, so that gas in the stagnation container is compressed and the supercharging effect is achieved, after the fourth stop valve is opened, the supercharging gas of the stagnation container enters the pressure stabilizing buffer tank, the purpose of supercharging the pressure stabilizing buffer tank is achieved, and after the air pressure in the pressure stabilizing buffer tank reaches the requirement (such as the air pressure of the secondary pressure reducing valve of the flow rough adjusting gas circuit or more), the booster pump and the fourth stop valve are closed.
The device not only can accurately adjust the pressure of the pressure stabilizing buffer tank, but also can effectively improve the gas recycling utilization rate of the gas circuit system and reduce the use cost of experimental gas of the system.
Preferably, the surge tank 21 is connected to the gas cylinder 11 in the coarse flow adjustment gas path, and the two are connected through a fifth stop valve 27. The surge tank is also directly or indirectly connected to a booster pump. When the device works, the fifth stop valve 27 and the second-stage pressure reducing valve can be opened, and other stop valves are closed at the same time, so that the gas cylinder of the flow rough regulating gas circuit fills experimental gas into the pressure stabilizing buffer tank of the flow fine regulating gas circuit to achieve a pressure value required by independent use. When the two air circuits work simultaneously, the booster pump is also required to further improve the air pressure for the pressure stabilizing buffer tank.
The gas cylinder usage amount of the gas circuit system is reduced to the greatest extent, so that the gas circuit system is perfect in function and meanwhile the structure is simplified.
Preferably, the gas cylinder 11 is a natural gas cylinder, so as to improve the accuracy of the verification result of the gas meter, so as to meet the verification requirement of the ultrasonic flowmeter. Natural gas bottle is filled with natural gas components with the ratio required by the experiment, and all the regulating valves and the switch valves are ensured to be in a closed state before the experiment.
In other embodiments, if applied to other types of gas meters, the gas cylinders may be replaced with air cylinders to reduce verification costs.
In this embodiment, all the aforementioned stop valves adopt ball valves, and the gas tightness of ball valves is good, and on-off control effect is good. In other embodiments, the shut-off valve may be of other types than ball valves.
In this embodiment, the relief pressure valve of installing on the gas cylinder is the second grade relief pressure valve to realize the accurate decompression to gas cylinder air output and decompression stability, satisfy its user demand.
Preferably, a first labeling flow meter 42 is disposed upstream of the detection interface, a second standard flow meter 44 is disposed downstream of the detection interface, a first sensor 43 is disposed immediately downstream of the first labeling flow meter, a second pressure sensor 45 and a third pressure sensor 46 are disposed immediately upstream and downstream of the second standard flow meter.
The gas meter verification gas circuit system has wide application range, and can be suitable for flow test requirements with a larger range, such as 0.016-0.4 m 3 Small flow test per hour, 0.8-16 m 3 High flow test per hour and 0.4-0.8 m 3 Medium flow test per h.
In addition, the "gas meter" herein includes not only household gas meters but also flow meters, and such meters are suitable for the gas meter verification gas circuit system and the gas flow error checking device of the present application.
Testing method of gas flow error checking system
In a second aspect, the present embodiment further provides a testing method of the gas flow error checking system, which is operated according to one of the following two flow testing methods:
(1) Small flow (e.g. (0.016-0.4)) m 3 The/h test method comprises the following steps:
s0, closing the evacuation valve 25, the evacuation valve 311, the drain valve 36 and valves at the booster pump, opening the fourth stop valve 33, opening the valves at the vacuum pump 24 and other valves in the pipeline, starting the vacuum pump to vacuumize, evacuating the gas in the pressure stabilizing buffer tank, the stagnation container tank and the whole pipeline system, and closing the vacuum pump, the fourth stop valve 33 and the valves at the vacuum pump to facilitate the subsequent operation;
s11, opening a pressure reducing valve and a fifth stop valve 27 to enable the gas cylinder 11 to convey experimental gas for the surge tank 21, and closing the fifth stop valve when the pressure in the surge tank reaches an experimental pressure value to maintain the pressure in the surge tank stable;
s12, closing the first stop valve 12, opening the third stop valve 22 and the micro-flow regulating valve 2, opening a flow fine-tuning gas circuit, enabling the pressure stabilizing buffer tank to serve as the only gas source to convey gas for the gas circuit, simultaneously opening the second stop valve 32, enabling the gas in the gas circuit to be recovered into the stagnation container 31, and achieving fine tuning of the gas flow in the gas circuit by operating the micro-flow regulating valve 2 (shown in fig. 2).
When the gas meter verification gas circuit system is applied to a natural gas flow testing device, the flow value of experimental gas in a gas circuit can be detected according to the first standard flow meter 42, and fine adjustment of the gas flow is performed through the micro-flow regulating valve 2; during operation, experimental gas sequentially passes through the standard flowmeter, the pressure sensor and the gas meter to be tested which are arranged in the gas circuit from the pressure stabilizing buffer tank and then enters the stagnation container. The data acquisition can be started after the air flow is stable within a few minutes after the experimental process is started, and the verification quantity is set according to the flow value.
(2) The high flow test method comprises the following steps:
s21, enabling the gas bottle 11 to convey experimental gas for the pressure stabilizing buffer tank 21, wherein the gas pressure in the pressure stabilizing buffer tank is not less than the gas pressure after being processed by the secondary pressure reducing valve of the flow rough adjusting gas circuit (namely, the P stability is more than or equal to P reduction);
s22, opening a second-stage pressure reducing valve, a first stop valve 12, a first flow regulating valve 13, a third stop valve 22 and a micro-flow regulating valve 23 to enable a flow rough adjusting gas path and a flow fine adjusting gas path to serve as gas sources to provide gas flows, and simultaneously opening a second stop valve 32 to enable the gas to be recovered by a stagnation container 31; coarse adjustment of the air path flow is achieved through the first flow adjusting valve 13, and accurate adjustment of the air path flow is achieved through the micro flow adjusting valve 23 (shown in fig. 3).
When the gas meter verification gas circuit system is applied to a natural gas flow testing device, the flow value in a gas circuit can be detected according to a first standard flow meter, and the flow value is regulated to be near a value required by an experiment through a first flow regulating valve, so that rough adjustment of the flow is completed; and then, accurately adjusting the flow value through a micro-flow adjusting valve, so that the flow is accurately controlled to the pressure required by the experiment.
During operation, the experimental gas flows out of the flow rough adjusting gas circuit and the flow fine adjusting gas circuit respectively and sequentially passes through a standard flowmeter, a pressure sensor and a gas meter to be measured which are arranged in the gas circuit and then enters the stagnation container. The flow coarse adjustment gas circuit and the flow fine adjustment gas circuit are respectively adjusted through the two flow regulating valves, so that the accurate regulation and control of the flow of the main and branch paths are realized.
Preferably, the testing method of the gas flow error checking system further comprises the following method for medium flow testing:
(3) The medium flow test method comprises the following steps:
when the medium flow test is performed, on one hand, the method can refer to the high flow test method, and meanwhile, a rough flow adjustment gas circuit and a fine flow adjustment gas circuit are opened to accurately regulate and control the flow of the main and branch paths. On the other hand, the use requirement can be met by only opening the flow rough adjusting air passage and adjusting the air passage through the first flow adjusting valve. The specific method comprises the following steps:
s31, opening a secondary pressure reducing valve, a first stop valve 12 and a first flow regulating valve 13 to enable the rough flow gas paths to serve as gas sources to provide gas flow, and simultaneously opening a second stop valve 32 to enable the gas to be recovered by a stagnation container 31; coarse adjustment of the gas path flow is achieved through the first flow adjusting valve 13.
Or, the operation is performed by adopting the method of the S22, and the common adjustment is performed through the adjusting valves of the flow rough adjusting air path and the flow fine adjusting air path.
Gas meter flow error calibrating device and method
The embodiment also provides a gas meter flow error verification device, which comprises the gas flow error verification system and a central control module for analyzing and calculating data collected by the standard flowmeter and the pressure sensor, wherein the standard flowmeter and the pressure sensor are arranged to transmit relevant real-time data to the central control module.
The central control module is in control connection with each valve body and each sensor of the system, analyzes and calculates data acquired by the sensors, and displays a test result on a display end.
The pressure sensor, the standard flowmeter and the gas meter to be measured are all provided with serial port communication modes, so that the pressure sensor, the standard flowmeter and the gas meter to be measured are conveniently connected to a PC (personal computer) end upper computer, and data transmission control and statistical analysis and calculation are carried out through the PC end.
As shown in fig. 1, the central control module is a PC-side upper computer (i.e. a computer capable of sending an operation instruction), and can regulate and control the working states of components in the gas flow error checking system or the gas meter flow error checking device through the upper computer, and calculate and obtain standard flow values and indication error values of the gas meters to be tested through the received signals of the sensors.
The embodiment also provides a gas meter flow error verification method based on the device, which comprises the following steps:
s41, connecting n gas meters to be detected to a detection interface in a serial mode, wherein flow readings of the gas meters to be detected are respectively as follows in sequence: g1, G2, G3 … G n The method comprises the steps of carrying out a first treatment on the surface of the n represents the total number of gas meters to be tested in series, and n is more than or equal to 1.
S42, after the flow rate is adjusted by adopting the testing method, the following data are collected: detecting a value Q1 of a first standard flow meter arranged on the upstream side of the interface, a value P1 of a first pressure sensor arranged on the downstream side of the first standard flow meter, a value Q2 of a second standard flow meter arranged on the downstream side of the interface, a value P2 of a second pressure sensor arranged on the upstream side of the second standard flow meter and a value P3 of a third pressure sensor;
s43, the experimental process is in a constant temperature environment, the temperature is controlled to be about 20 ℃, the volume flow measurement caused by temperature change is ignored, the standard flow value is calculated according to the following formula I by taking Q1 as a reference:
Q label (C) = (α×q1+q2×p3/p1)/(1+α), wherein 0.7+.ltoreq.1, α being a weighting coefficient;
since the plurality of stop valves are arranged at the upstream of the first standard flowmeter and influence the flow value Q1 measured by the first standard flowmeter, in order to reduce the influence of the upstream valve on the flow value Q1 measured by the first standard flowmeter, the weighting coefficient of the first standard flowmeter is set to alpha, the weighting coefficient of the second standard flowmeter is set to 1, and 0.7 is less than or equal to alpha and less than or equal to 1, so that the weighted average standard flow value calculation is adopted for the two standard flowmeters to improve Q Label (C) Accuracy of (3).
When the influence of the upstream valve of the first standard flowmeter on the first standard flowmeter is smaller and alpha is set to be 1, Q Label (C) = (q1+q2×p3/p1)/2. Can be used in a gas flow error checking system according to practical applicationThe influence of the upstream valve of the first standard flowmeter on the flowmeter is reasonably set.
Because the pressure loss of the connecting pipelines is consistent in the experimental process and the pressure loss among the tables is also consistent, the pressure drop value of the single table is calculated according to the following formula II:
P lowering blood pressure =（P1-P2）/n；
S44, calculating the following formula III to calculate the standard flow value of the gas meter to be measured:
G m label =Q Label (C) *P1/(P1-mP Lowering blood pressure )；
S45, calculating the indication error of each gas meter to be detected according to the following formula IV based on the standard flow value obtained in the steps, so as to judge whether the gas meter to be detected meets the standard;
E m =（G m -G m label ）/G m label ；
And m is the serial number of the gas meters connected in series, and the gas meters are arranged along the direction of the gas flow.
Preferably, data acquisition is started 3-5 minutes before the experimental process is started, and the verification quantity is set according to the flow value.
In this embodiment, as shown in fig. 1, n is 5,5 gas meters to be measured are connected to the detection interface in series, and data are substituted into the above formula, and the indication errors of the gas meters G1 to G5 are calculated as follows:
the G1 standard flow value is G1 Label (C) =Q Label (C) ×P1/(P1-P Lowering blood pressure ) The error of the indication of G1 is: e1 = (G1-G1) Label (C) ）/G1 Label (C) ；
The G2 standard flow value is G2 Label (C) =Q Label (C) ×P1/(P1-2P Lowering blood pressure ) The error of the indication of G2 is: e2 = (G2-G2) Label (C) ）/G2 Label (C) ；
The G3 standard flow value is G3 Label (C) =Q Label (C) ×P1/(P1-3P Lowering blood pressure ) The error of the indication of G3 is: e3 = (G3-G3) Label (C) ）/G3 Label (C) ；
The G4 standard flow value is G4 Label (C) =Q Label (C) ×P1/(P1-4P Lowering blood pressure ) The error of the indication of G4 is: e4 = (G4-G4) Label (C) ）/G4 Label (C) ；
The G5 standard flow value is G5 Label (C) =Q Label (C) ×P1/(P1-5P Lowering blood pressure ) The error of the indication of G5 is: e5 = (G5-G5) Label (C) ）/G5 Label (C) 。
The method adopts the accumulated flow average error method to realize the synchronous same-frequency data acquisition of the standard flow meter and the measured meter, reduces the instantaneous error measurement brought by flow fluctuation, adopts the double-standard gauge pressure loss analysis calibration method to bring the pipeline pressure loss into the standard flow value calculation, and realizes the accurate measurement of the indication error of each to-be-measured meter corresponding to each standard flow value.
Example 2
The present embodiment provides another gas flow error checking system, which differs from embodiment 1 in that:
the surge tank 21 is connected to the other gas cylinder 11 via a fifth shutoff valve 27. The inflation of the pressure stabilizing buffer tank is independently arranged, so that the pressure stabilizing buffer tank is easier to regulate and control, and is an alternative scheme of the embodiment 1. The test method of the gas flow error checking system and the gas meter flow error checking method of the present embodiment refer to embodiment 1.
Example 3
The present embodiment provides another gas flow error checking system, which differs from embodiment 2 in that: the air outlet end of the stagnation container 31 is not connected to the surge tank 21. Therefore, in this embodiment, the gas recovered from the stagnation container cannot be filled into the surge tank, and the recovery rate of the experimental gas is not as high as that of embodiment 1, and the present application is also limited in scope by the present application. The test method of the gas flow error checking system and the gas meter flow error checking method of the present embodiment refer to embodiment 1.
It will be understood that equivalents and modifications will occur to those skilled in the art in light of the present teachings and concepts, and all such modifications and substitutions are intended to be included within the scope of the present application as defined in the accompanying claims.
Claims (9)
1. A gas flow error checking system, comprising: the gas meter comprises a gas supply gas circuit, a gas meter detection part (4) and a gas recovery gas circuit (3) which are sequentially connected in series with the gas supply gas circuit, wherein the gas supply gas circuit comprises a flow rough adjustment gas circuit (1) and a flow fine adjustment gas circuit (2) which are arranged in parallel;
the flow rough adjusting gas circuit (1) takes a gas cylinder (11) provided with a pressure reducing valve as a gas source, and a first stop valve (12) and a first flow adjusting valve (13) are arranged on the gas circuit; the flow fine-tuning gas circuit (2) comprises a pressure stabilizing buffer tank (21) serving as a gas source, a third stop valve (22) and a micro-flow regulating valve (23) which are arranged on the gas circuit;
the pressure stabilizing buffer tank is connected with an air bottle through a fifth stop valve, the pressure stabilizing buffer tank is connected with a vacuum pump (24), and a second emptying valve (25) and a fourth pressure sensor (26) are also arranged on the pressure stabilizing buffer tank; a stagnation container (31) is arranged on the gas recovery gas circuit (3);
the gas meter detection section includes: a detection interface (41) for mounting the detection gas meter, and corresponding standard flow meters and pressure sensors mounted both upstream and downstream of the detection interface.
2. The gas flow error checking system of claim 1, wherein the gas cylinder is a natural gas cylinder.
3. The gas flow error checking system according to claim 1, wherein a fourth stop valve (33) is provided at the gas outlet end of the stagnation vessel (31) and connected to the surge tank; the air inlet end of the stagnation container (31) is provided with a second stop valve (32), and the stagnation container (31) is provided with a first evacuation valve (311).
4. A gas flow error checking system according to claim 3, characterized in that the stagnation container (31) is connected to a water tank (35) by means of a booster pump (34), the stagnation container (31) being further provided with a drain pipe communicating with the water tank, and that the drain pipe is provided with a sixth shut-off valve (36).
5. The gas flow error checking system according to claim 4, wherein the gas cylinders connected with the pressure stabilizing buffer tank are gas cylinders in a coarse flow adjusting gas path, and the gas cylinders are connected through a fifth stop valve; the surge tank is also directly or indirectly connected to a booster pump.
6. The gas flow error checking system of any of claims 1-5, further comprising a central control module for analyzing and calculating data collected by the standard flow meter and the pressure sensor, the standard flow meter and the pressure sensor being configured to transmit the relevant real-time data to the central control module.
7. A method of testing a gas flow error checking system according to claim 6, operated from one of two flow testing methods:
(1) The small flow test method comprises the following steps:
operating the related stop valve and the vacuum pump to empty the gas in the pressure stabilizing buffer tank, the stagnation container tank body and the whole pipeline;
s11, opening a pressure reducing valve and a fifth stop valve to enable the gas cylinder (11) to convey experimental gas for the pressure stabilizing buffer tank (21), and closing the fifth stop valve when the pressure in the pressure stabilizing buffer tank reaches an experimental pressure value to maintain the pressure in the pressure stabilizing buffer tank stable;
s12, closing the first stop valve (12), opening the third stop valve (22) and the micro-flow regulating valve (2), opening a flow fine-tuning gas circuit, and simultaneously opening the second stop valve (32) to recover gas in the gas circuit into the stagnation container (31), and realizing fine tuning of the gas flow in the gas circuit by operating the micro-flow regulating valve (2);
(2) The high flow test method comprises the following steps:
s21, enabling the gas bottle (11) to convey experimental gas for the pressure stabilizing buffer tank 21, wherein the gas pressure in the pressure stabilizing buffer tank is not smaller than the gas pressure after being processed by the secondary pressure reducing valve of the flow rough adjusting gas circuit;
s22, opening a second-stage pressure reducing valve, a first stop valve (12), a first flow regulating valve (13), a third stop valve (22) and a micro flow regulating valve (23), so that a flow rough regulating air path and a flow fine regulating air path are used as air sources to provide air flow, and simultaneously opening a second stop valve (32) to recover the air by a stagnation container (31); coarse adjustment of the air path flow is achieved through the first flow adjusting valve (13), and accurate adjustment of the air path flow is achieved through the micro flow adjusting valve (23).
8. The method of testing a gas flow error checking system according to claim 7, further comprising the following method for medium flow testing:
(3) The medium flow test method comprises the following steps:
s31, opening a second-stage pressure reducing valve, a first stop valve (12) and a first flow regulating valve (13) to enable the rough flow gas paths to serve as gas sources to provide gas flow, and simultaneously opening a second stop valve (32) to enable the gas to be recovered by a stagnation container (31); coarse adjustment of the air path flow is achieved through a first flow adjusting valve (13);
alternatively, the operation is performed by the method of S22 described above.
9. The gas meter flow error verification method is characterized by comprising the following steps of:
s41, connecting n gas meters to be detected to a detection interface in a serial mode, wherein flow readings of the gas meters to be detected are respectively as follows in sequence: g1, G2, G3 … G n The method comprises the steps of carrying out a first treatment on the surface of the n represents the total number of gas meters to be tested in series, and n is more than or equal to 1;
s42, after the flow rate is adjusted by the test method according to claim 7 or 8, the following data are collected: detecting a value Q1 of a first standard flow meter arranged on the upstream side of the interface, a value P1 of a first pressure sensor arranged on the downstream side of the first standard flow meter, a value Q2 of a second standard flow meter arranged on the downstream side of the interface, a value P2 of a second pressure sensor arranged on the upstream side of the second standard flow meter and a value P3 of a third pressure sensor;
s43, calculating a standard flow value according to the following formula I:
Q label (C) = (α×q1+q2×p3/p1)/(1+α), wherein 0.7+.ltoreq.α+.1;
and calculating a single table pressure drop value according to the following formula II:
P lowering blood pressure =（P1-P2）/n；
S44, calculating the following formula III to calculate the standard flow value of the gas meter to be measured:
G m label =Q Label (C) *P1/(P1-mP Lowering blood pressure )；
S45, calculating the indication error of each gas meter to be detected according to the following formula IV based on the standard flow value obtained in the steps, so as to judge whether the gas meter to be detected meets the standard;
E m =（G m -G m label ）/G m label ；
Wherein m is the serial number of the gas meter.
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| CN117686070A (en) * | 2024-01-11 | 2024-03-12 | 郑州安然测控技术股份有限公司 | Gas metering and evaluating system and method |
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