CN113970366A - Calibration method and system for gas flow metering device - Google Patents
Calibration method and system for gas flow metering device Download PDFInfo
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Abstract
The invention discloses a calibration method and a calibration system of a gas flow metering device, wherein the instruction method comprises the steps of enabling gas to flow out at a constant flow rate, sequentially flowing through a flowmeter to be detected in a first environment and a standard flowmeter in a second environment, and calculating the standard flow rate of the gas in the first environment according to a gas pressure formula based on a gas pressure parameter of the first environment, a gas pressure calculation parameter of the second environment and the measurement flow rate of the standard flowmeter; and calculating the relative error of the flowmeter to be detected according to the standard flow rate of the gas in the first environment and the measurement flow rate of the flowmeter to be detected. By utilizing the gas pressure relation, when the environment to which the flowmeter to be detected or the standard flowmeter belongs changes, the calibration result is not influenced, the calibration precision is improved, the gas real gas tank is used for providing the gas real gas, and finally the output gas is recovered to the gas real gas tank for cyclic utilization, so that the resources are saved.
Description
Technical Field
The invention relates to the technical field of gas detection, in particular to a calibration method and a calibration system for a gas flow metering device.
Background
Natural gas becomes the first choice of domestic energy structures as a clean, efficient and high-quality energy. With the wide use of natural gas, how to realize fair measurement is particularly important as a gas meter used for urban natural gas consumer trade measurement. Along with the construction and popularization of gas transmission pipelines, gas meters emerge like bamboo shoots in spring after rain, from mechanical type to electronic type, from traditional membrane meters to full-electronic ultrasonic gas meters, new concepts and new technologies continue to emerge, the accuracy and the application range of various flow meters are also continuously improved, and the ultrasonic flow meters gradually move from the industrial field to the household field due to the advantages of advanced technology and easy intellectualization.
In particular, in recent years, ultrasonic gas meters are exposed in the market of gas meters with strong potential, but the ultrasonic gas meters are all electronic meters, and the flow value monitored by the ultrasonic gas meters is shifted along with the change of the use environment, so that the ultrasonic gas meters have large entrance and exit with the actual flow, and cannot measure normally.
When the gas flow metering device is calibrated, the traditional method is to extract air through an air extraction pump to simulate gas to flow through a pipeline, then measure the air through a standard flow meter and a flow meter to be detected, and finally complete the calibration of the flow meter to be detected.
Disclosure of Invention
The invention aims to solve the technical problem that the calibration precision is limited due to the fact that air flows relatively and the method is open and has a certain difference with an actual application scene in the traditional method.
The invention is realized by the following technical scheme:
the invention provides a calibration method of a gas flow metering device, which comprises the following steps:
s1, enabling the gas to flow out at a constant flow rate, and sequentially flowing through a flowmeter to be detected and a standard flowmeter, wherein the flowmeter to be detected is in a first environment, and the standard flowmeter is in a second environment;
s2, changing the temperature of the first environment, and acquiring a gas pressure parameter of the first environment, a gas pressure calculation parameter of the second environment, a measurement flow rate of a flowmeter to be detected and a measurement flow rate of a standard flowmeter;
s3, calculating the standard flow rate of the gas in the first environment according to a gas pressure formula based on the gas pressure parameter of the first environment, the gas pressure calculation parameter of the second environment and the measured flow rate of the standard flowmeter;
and S4, calculating the relative error of the flow meter to be detected in the first environment at the current temperature based on the standard flow rate of the gas in the first environment and the measured flow rate of the flow meter to be detected.
The working principle of the scheme is as follows: when the traditional method is used for calibrating the gas flow metering device, air is extracted through the air extraction pump to simulate gas to flow through a pipeline, and then the air is metered through the standard flow meter and the flow meter to be tested so as to complete calibration of the flow meter to be tested. The gas flow metering device calibration method provided by the scheme uses gas real gas for calibration, so that the flowmeter to be detected and the standard flowmeter are positioned in different environments, a gas pressure formula is used for calculating a standard value, the standard value and the measured value of the flowmeter to be detected are used for calibration, and by using the relationship of gas pressure, when the environment to which the flowmeter to be detected or the standard flowmeter belongs changes, the calibration result is not influenced, and the calibration precision is improved.
The further optimization scheme is that the first environment is as follows: the temperature is adjustable, and the volume is constant; the second environment is: the temperature is constant.
In order to calibrate accurately, the temperature of the first environment is adjustable, a plurality of groups of relative errors can be obtained when the flowmeter to be detected is at different temperatures, a group of relative errors can be calculated by acquiring parameters of the flowmeter to be detected and the standard flowmeter at one time at each temperature, the relative errors can be closer to the actual using environment, and the calibration result is more accurate.
Further optimization scheme is that the gas pressure parameter of the first environment comprises: the temperature and pressure of a first environment where the gas is in real gas;
the gas pressure calculation parameters of the second environment include: the constant temperature and pressure of the second environment in which the gas is in.
The gas pressure formula is:
wherein P1 is the pressure of the first environment where the gas is in; t1 is the temperature of the first environment where the gas is in; v1 is the volume of the gas in the first environment; p2 is the pressure of the second environment where the gas is located, T2 is the constant temperature of the second environment where the gas is located, and V1 is the volume of the gas in the second environment, wherein the volume can be obtained according to the measurement of a standard flowmeter; because of the low pressure, the effect of the change in compression factor due to the solid gas composition is neglected.
And calculating the volume V1 of the gas real gas in the first environment according to the formula, and further calculating the standard flow rate of the gas real gas in the first environment.
The scheme also provides a calibration system of the gas flow metering device, which is applied to the calibration method of the gas flow metering device and comprises the following steps: a gas solid tank, a warm box and a standard flowmeter;
the gas real gas tank outputs gas real gas at a constant flow rate, the gas real gas is conveyed to the incubator, flows through the standard flowmeter after being subjected to temperature rise or temperature reduction treatment, and is finally collected back to the gas real gas tank;
the gas real gas tank outputs gas real gas at a constant flow rate (depending on pressure difference and accurate regulation and control of a mems valve switch), the gas flows into a first environment (established by long-time ambient temperature), flows through a standby meter, then the gas real gas is conveyed to a second environment, a incubator is subjected to temperature rise or temperature reduction treatment (a heat exchanger and a dryer absorbs condensed water caused by low temperature) and flows through a standard flowmeter, and finally the condensed water is collected back to the gas real gas tank through a gas compressor.
The flowmeter to be detected is arranged in the incubator to measure the gas solid gas after temperature rise or temperature reduction treatment.
The utility model provides a pair of gas flow metering device calibration system uses the real gas pitcher of gas to provide the real gas of gas, withdraws the gas of output to the real gas pitcher of gas at last, cyclic utilization, resources are saved.
The further optimization scheme is that the system also comprises a collecting device, a calculating device and a calibrating device;
the collecting device is used for acquiring a gas pressure parameter in the incubator, a gas pressure parameter outside the incubator, a measurement flow rate of the flowmeter to be detected and a measurement flow rate of the standard flowmeter;
the calculating device calculates the standard flow rate of the gas in the incubator according to a gas pressure formula based on the gas pressure parameter in the incubator, the gas pressure parameter outside the incubator and the measured flow rate of the standard flowmeter;
the calibration device calculates the relative error of the flowmeter to be detected based on the standard flow rate of gas in the incubator and the measurement flow rate of the flowmeter to be detected.
The further optimization scheme is that the method further comprises the following steps: the MEMS valve switch controls the gas real gas tank to output gas real gas at a constant flow rate, and the feedback unit adjusts the MEMS valve switch according to the measured flow rate of the standard flowmeter.
The further optimization scheme is that the method for adjusting the opening and closing of the MEMS valve by the feedback unit according to the measured flow rate of the standard flowmeter comprises the following steps:
the feedback unit samples the measurement flow velocity of a plurality of groups of standard flowmeters in a period of time, calculates the average measurement flow velocity, reduces the MEMS valve switch when the measurement flow velocity sampled next time is larger than the average measurement flow velocity, and increases the MEMS valve switch when the measurement flow velocity sampled next time is smaller than the average measurement flow velocity. The amount of turning up or turning down the MEMS valve switch in the adjusting process is the difference between the sampled measured flow rate and the average measured flow rate.
The air supply output with invariable velocity of flow needs to be guaranteed to the demarcation in-process, because use the real gas jar of gas needs to export the real gas of gas with invariable velocity of flow, ordinary switch needs manual regulation, and the actual output after the regulation is hardly appraised, just there is very big error between actual output and the output of wanting, therefore this scheme uses MEMS valve switch to control the real gas jar of gas, and introduce the measurement velocity of flow of standard flowmeter and carry out feedback regulation, MEMS valve switch can carry out the free quantity according to the feedback quantity and adjust, realize stepless regulation in order to guarantee that the air supply outputs with invariable velocity of flow, establish the basis for accurate demarcation.
The further optimization scheme is that the incubator comprises: the gas real gas after rising or lowering the temperature flows to the flowmeter of waiting examining after filtering unit filtering steam. After the fuel gas is heated or cooled by the heat exchange unit of the incubator, impurities such as steam are not generated, and the impurities are filtered by the filtering unit, so that the calibration precision is improved, and the safety can be guaranteed.
Compared with the prior art, the invention has the following advantages and beneficial effects:
according to the calibration method and the calibration system for the gas flow metering device, the to-be-detected flowmeter and the standard flowmeter are positioned in different environments, the standard value is calculated by using the gas pressure formula, the standard value and the measured value of the to-be-detected flowmeter are used for calibration, the gas pressure relation is used, when the environment of the to-be-detected flowmeter or the standard flowmeter changes, the calibration result is not influenced, the calibration precision is improved, the gas real gas is provided by using the gas real gas tank, and finally the output gas is recycled to the gas real gas tank, so that resources are saved.
Drawings
In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and that for those skilled in the art, other related drawings can be obtained from these drawings without inventive effort. In the drawings:
FIG. 1 is a schematic flow chart of a calibration method of a gas flow metering device;
FIG. 2 is a schematic structural diagram of a calibration system of the gas flow metering device.
Reference numbers and corresponding part names in the drawings:
1-a gas real gas tank, 2-a first environment, 3-a flowmeter to be detected, 4-a standard flowmeter, 5-a second environment and 6-a gas collecting device.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to examples and accompanying drawings, and the exemplary embodiments and descriptions thereof are only used for explaining the present invention and are not meant to limit the present invention.
Examples
As shown in fig. 1, the present embodiment provides a calibration method for a gas flow metering device, including the steps of:
s1, enabling the gas to flow out at a constant flow rate, and sequentially flowing through a flowmeter to be detected and a standard flowmeter, wherein the flowmeter to be detected is in a first environment, and the standard flowmeter is in a second environment;
s2, changing the temperature of the first environment, and acquiring a gas pressure parameter of the first environment, a gas pressure calculation parameter of the second environment, a measurement flow rate of a flowmeter to be detected and a measurement flow rate of a standard flowmeter;
s3, calculating the standard flow rate of the gas in the first environment according to a gas pressure formula based on the gas pressure parameter of the first environment, the gas pressure calculation parameter of the second environment and the measured flow rate of the standard flowmeter;
and S4, calculating the relative error of the flow meter to be detected in the first environment at the current temperature based on the standard flow rate of the gas in the first environment and the measured flow rate of the flow meter to be detected.
The first environment is: the temperature is adjustable, and the volume is constant; the second environment is: the temperature is constant.
The gas pressure parameters of the first environment include: the temperature and pressure of a first environment where the gas is in real gas;
the gas pressure calculation parameters of the second environment include: the constant temperature and pressure of the second environment in which the gas is in.
Example 2
As shown in fig. 2, the present embodiment provides a calibration system for a gas flow measuring device, which is applied to the calibration method for a gas flow measuring device in the previous embodiment, and includes: a gas solid tank 1, a warm box and a standard flowmeter 4; the interior of the incubator is used as a first environment 2, and the exterior of the incubator is used as a second environment 5;
the gas real gas tank 1 outputs gas real gas at a constant flow rate, the gas real gas is conveyed to a temperature box, flows through a standard flowmeter 4 after being subjected to temperature rise or temperature reduction treatment, and is finally collected by a gas collecting device 6 and returned to the gas real gas tank 1;
the flowmeter 3 to be detected is arranged in the incubator to measure the gas solid gas after temperature rise or temperature reduction treatment.
The device also comprises a collecting device, a calculating device and a calibrating device;
the collecting device is used for acquiring a gas pressure parameter in the incubator, a gas pressure parameter outside the incubator, a measurement flow rate of the flowmeter to be detected and a measurement flow rate of the standard flowmeter;
the calculating device calculates the standard flow rate of the gas in the incubator according to a gas pressure formula based on the gas pressure parameter in the incubator, the gas pressure parameter outside the incubator and the measured flow rate of the standard flowmeter;
the calibration device calculates the relative error of the flowmeter to be detected based on the standard flow rate of gas in the incubator and the measurement flow rate of the flowmeter to be detected.
Further comprising: the MEMS valve switch controls the gas real gas tank to output gas real gas at a constant flow rate, and the feedback unit adjusts the MEMS valve switch according to the measured flow rate of the standard flowmeter.
The method for adjusting the opening and closing of the MEMS valve by the feedback unit according to the measured flow rate of the standard flowmeter comprises the following steps:
the feedback unit samples the measurement flow velocity of a plurality of groups of standard flowmeters in a period of time, calculates the average measurement flow velocity, reduces the MEMS valve switch when the measurement flow velocity sampled next time is larger than the average measurement flow velocity, and increases the MEMS valve switch when the measurement flow velocity sampled next time is smaller than the average measurement flow velocity.
The incubator includes: the gas real gas after rising or lowering the temperature flows to the flowmeter of waiting examining after filtering unit filtering steam.
The outside of the incubator is generally maintained at 20 degrees celsius as a second environment 5; the second environment can be placed in a room, the temperature is adjusted to be 20 ℃ by an air conditioner, and a thermostat can be independently used as the second environment.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (8)
1. A calibration method for a gas flow metering device is characterized by comprising the following steps:
s1, enabling the gas to flow out at a constant flow rate, and sequentially flowing through a flowmeter to be detected and a standard flowmeter, wherein the flowmeter to be detected is in a first environment, and the standard flowmeter is in a second environment;
s2, changing the temperature of the first environment, and acquiring a gas pressure parameter of the first environment, a gas pressure calculation parameter of the second environment, a measurement flow rate of a flowmeter to be detected and a measurement flow rate of a standard flowmeter;
s3, calculating the standard flow rate of the gas in the first environment according to a gas pressure formula based on the gas pressure parameter of the first environment, the gas pressure calculation parameter of the second environment and the measured flow rate of the standard flowmeter;
and S4, calculating the relative error of the flow meter to be detected in the first environment at the current temperature based on the standard flow rate of the gas in the first environment and the measured flow rate of the flow meter to be detected.
2. The method for calibrating a gas flow metering device according to claim 1, wherein the first environment is: the temperature is adjustable, and the volume is constant; the second environment is: the temperature is constant.
3. The calibration method of a gas flow metering device according to claim 2,
the gas pressure parameters of the first environment include: the temperature and pressure of a first environment where the gas is in real gas;
the gas pressure calculation parameters of the second environment include: the temperature and pressure of the second environment in which the gas is in real gas.
4. A calibration system for a gas flow measuring device, which is applied to the calibration method for a gas flow measuring device of any one of claims 1 to 3, and comprises: a gas solid tank, a warm box and a standard flowmeter;
the gas real gas tank outputs gas real gas at a constant flow rate, the gas real gas is conveyed to the incubator to be subjected to temperature rise or temperature reduction treatment and then flows through the standard flowmeter, and finally the gas real gas is collected back to the gas real gas tank;
the flowmeter to be detected is arranged in the incubator to measure the gas solid gas after temperature rise or temperature reduction treatment.
5. The gas flow metering device calibration system according to claim 4, further comprising a collection device, a calculation device and a calibration device;
the collecting device is used for acquiring a gas pressure parameter in the incubator, a gas pressure parameter outside the incubator, a measurement flow rate of the flowmeter to be detected and a measurement flow rate of the standard flowmeter;
the calculating device calculates the standard flow rate of the gas in the incubator according to a gas pressure formula based on the gas pressure parameter in the incubator, the gas pressure parameter outside the incubator and the measured flow rate of the standard flowmeter;
the calibration device calculates the relative error of the flowmeter to be detected based on the standard flow rate of gas in the incubator and the measurement flow rate of the flowmeter to be detected.
6. The gas flow metering device calibration system according to claim 5, further comprising: the MEMS valve switch controls the gas real gas tank to output gas real gas at a constant flow rate, and the feedback unit adjusts the MEMS valve switch according to the measured flow rate of the standard flowmeter.
7. The calibration system of the gas flow metering device according to claim 6, wherein the method for the feedback unit to adjust the opening and closing of the MEMS valve according to the measured flow rate of the standard flow meter comprises the following steps:
the feedback unit samples the measurement flow velocity of a plurality of groups of standard flowmeters in a period of time, calculates the average measurement flow velocity, reduces the MEMS valve switch when the measurement flow velocity sampled next time is larger than the average measurement flow velocity, and increases the MEMS valve switch when the measurement flow velocity sampled next time is smaller than the average measurement flow velocity.
8. The gas flow metering device calibration system according to claim 4, wherein the incubator comprises: the gas real gas after rising or lowering the temperature flows to the flowmeter of waiting examining after filtering unit filtering steam.
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| WO2013006090A1 (en) * | 2011-07-07 | 2013-01-10 | Belyaev Boris Mikhailovich | The calibration method, applied in operating conditions, for ultrasonic flow meters used for measuring volume and flow rate of single-phase liquid media |
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| CN112033487A (en) * | 2020-07-31 | 2020-12-04 | 上海真兰仪表科技股份有限公司 | Gas pipeline flowmeter and gas flow correction algorithm |
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- 2021-11-01 CN CN202111284736.2A patent/CN113970366B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2013006090A1 (en) * | 2011-07-07 | 2013-01-10 | Belyaev Boris Mikhailovich | The calibration method, applied in operating conditions, for ultrasonic flow meters used for measuring volume and flow rate of single-phase liquid media |
| CN105403259A (en) * | 2015-10-30 | 2016-03-16 | 四川泰鹏测控仪表科技有限公司 | High-precision intelligent gas meter |
| CN109632029A (en) * | 2018-12-20 | 2019-04-16 | 广州燃气集团有限公司 | The method for choosing the accurate measurement magnitude of pipeline flow compensation pressure point |
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