CN113899431A - Mobile flow online calibration system - Google Patents
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- CN113899431A CN113899431A CN202111042131.2A CN202111042131A CN113899431A CN 113899431 A CN113899431 A CN 113899431A CN 202111042131 A CN202111042131 A CN 202111042131A CN 113899431 A CN113899431 A CN 113899431A
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- 238000003745 diagnosis Methods 0.000 claims abstract description 13
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- 239000012530 fluid Substances 0.000 claims description 27
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- 238000013480 data collection Methods 0.000 claims 1
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- 230000001419 dependent effect Effects 0.000 description 1
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Abstract
The invention discloses a mobile flow online calibration system, which comprises a data acquisition, compensation and diagnosis controller, a base, a high-precision Coriolis mass flowmeter, a connecting pipeline, a temperature transmitter and a pressure transmitter, wherein the base is connected with the Coriolis mass flowmeter; the data acquisition, compensation and diagnosis controller acquires the operating temperature of the system in real time and compensates the influence of the operating temperature on the zero point of the mass flowmeter; the data acquisition, compensation and diagnosis controller diagnoses the Coriolis mass flowmeter on line in real time, and ensures that the measured data of the standard meter for the flow online calibration system is accurate through diagnosing and analyzing the reliability of the measured data. The data acquisition, compensation and diagnosis controller acquires the system operation pressure in real time, and compensates the influence of the operation pressure on the measurement of the mass flowmeter; the system provided by the invention is suitable for on-line calibration of the field working flowmeter operating under different temperature and pressure conditions.
Description
Technical Field
The invention relates to a mobile flow online calibration system, and belongs to the technical field of fluid detection.
Background
In the field of industrial fluid measurement, the implementation of periodic calibration on a working flowmeter in use is a very important link in the maintenance work of the flowmeter, and the measurement accuracy and performance of the flowmeter can be ensured. The working flowmeter is connected into a standard device, and fluid flowing through the working flowmeter is compared with the standard device through weighing or standard meter metering data in a circulating mode, so that the aim of calibrating the working flowmeter is fulfilled, and the working flowmeter operates within a rated precision range.
The method for calibrating the working flowmeter by adopting the standard meter method is a convenient method, and can integrate the standard meter into a mobile standard device to realize on-line calibration of the field working flowmeter. The current standard meter flow calibration device uses a coriolis mass flowmeter as the standard meter is a common choice based on the high accuracy and stability characteristics of the coriolis mass flowmeter.
One key technique for calibrating a flow meter using a standard meter method is to ensure the measurement uncertainty (accuracy) of the standard meter device. The mass or volume flow measurement spread uncertainty for the standard device should not be greater than 1/3 for the absolute value of the calibrated meter's allowable error, as required by the relevant standards and regulations. How to ensure the uncertainty (precision) of the overall measurement by using a standard meter method device is a difficult problem which is always explored in the industry.
Based on the characteristics of the Coriolis mass flowmeter, for the measuring process of the Coriolis mass flowmeter, along with the temperature change of a measured medium, the working zero point of the Coriolis mass flowmeter changes correspondingly; meanwhile, because the coriolis mass flowmeter is a measuring tube vibration type working principle, a meter coefficient of the flowmeter is influenced by the working pressure of a measured medium. At present, there is no very reliable method for solving the above-mentioned influence of environment (operating temperature and pressure) on the uncertainty (accuracy) of measurement of the working state of the standard meter by using the coriolis mass flowmeter as a mobile calibration device of the standard meter.
For a gage system used in a laboratory operating environment, the zero point effect of the process media temperature on the coriolis mass flowmeter gage can be eliminated by tightly controlling the temperature of the calibration media (e.g., water). For a standard meter calibration system with a Coriolis mass flowmeter, which is used for calibrating an actual working medium, the influence of the operating temperature and pressure of a process medium on the Coriolis mass flowmeter needs to be compensated and corrected in real time, so that the high-precision requirement on the standard meter can be met.
Chinese patent CN201520300863.0 discloses a mobile calibration device composed of a standard mass flow meter. There is no relevant way to ensure that the coriolis mass flowmeter used is as accurate as a standard meter. The system uncertainty that can be realized is 0.11% described in this patent, and a working flowmeter for detecting that requires a precision of 0.2% is not sufficient.
A method for calibrating a process flow meter using a high-precision coriolis mass flowmeter integrated with a calibration system is disclosed in U.S. patent specification No. US 20040216509 a1 and chinese patent No. CN 1513110A. This patent discloses an adopt 2 mass flow meters of establishing ties to constitute the standard table for the check-up work flowmeter, a mass flow meter is used for the check-up work flowmeter, and another mass flow meter checks the flowmeter as the flowmeter for the check-up. Nor does the patent relate to how to ensure that a reference meter coriolis mass flowmeter eliminates the effect of temperature on 2 mass flowmeters as reference meters.
The measurement accuracy of the mass flowmeter as the standard meter is also heavily dependent on the operating process medium state, and if the operating process medium contains gas or is not uniform in fluid, the influence on the measurement accuracy of the mass flowmeter as the standard meter is very large. Confidence in the accuracy of operation of a proof mass flowmeter is insufficient when operating conditions deviate from the basic conditions required for a proof mass flowmeter. Neither the prior art nor the above-mentioned patent describes the relevant solutions.
In summary, ensuring the measurement accuracy of the mass flow meter as the reference meter is a core technology of the mobile flow calibration device. None of the above patents ensure the relevant compensation and diagnostic techniques for mass flow meters used as calibration tables; in the prior art and the method, an effective method which can effectively ensure the measurement confidence of the mobile flow calibration device is not available.
Disclosure of Invention
The invention aims to provide a method for effectively ensuring the measurement confidence of a mobile flow calibration device, a calibration system which can realize online real-time compensation and diagnosis for an online flow calibration system using a Coriolis mass flowmeter as a standard table, and a high-precision mobile flow calibration system which can carry out online calibration for a field-operated flowmeter in a certain operating temperature range and pressure condition.
In order to solve the technical problem, the technical scheme of the invention is to provide a mobile flow online calibration system, which is characterized in that: the Coriolis mass flowmeter temperature and pressure real-time compensation and diagnosis method comprises a process data acquisition, compensation and diagnosis controller, a temperature transmitter and a pressure transmitter, wherein the temperature and the pressure in the operation process are detected in real time, online real-time compensation and diagnosis are realized in the measurement process, and the influence quantity of the operation temperature on the zero point of the Coriolis mass flowmeter is fitted through measurement of a plurality of temperature points in the rated temperature range of an operation system; parameters were measured by a real-time acquired baseline coriolis mass flowmeter: the method comprises the steps of calculating the confidence coefficient P of the operating state of the Coriolis mass flowmeter according to the flow, the density, the drive gain and the detection coil signal parameters, and determining the detection data of the Coriolis mass flowmeter serving as a standard table to be used as field calibration standard data.
The mobile flow calibration system uses a process data acquisition, compensation and diagnostic controller and a temperature transmitter to acquire the real-time operating temperature of a process medium and compensate the influence of different operating temperatures on the reference Coriolis mass flowmeter in real time.
The mobile flow calibration system uses a process data acquisition, compensation and diagnostic controller to measure parameters through a reference coriolis mass flowmeter acquired in real time: and calculating the confidence P of the working state of the Coriolis mass flowmeter according to the flow, the density, the drive gain and the detection coil signal parameters, and judging the measured value by using the numerical value as the reliability basis of the on-line calibration working flowmeter.
Further, the mobile flow calibration device uses the process data acquisition, compensation and diagnostic controller and the pressure transmitter to acquire the real-time operating pressure of the process medium, and adopts a known pressure compensation algorithm to compensate the influence of the pressure on the measurement of the reference coriolis mass flowmeter in real time.
The mobile flow online calibration system provided by the invention can be used for online calibration of a flowmeter working on a fluid pipeline by using the mobile flow calibration device.
Drawings
Fig. 1 is a schematic structural diagram of a mobile flow calibration device in a mobile flow online calibration system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a fitting curve of the influence of process medium temperature on zero of a reference mass flow meter in a mobile flow online calibration system according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of a mobile flow calibration device for performing a calibration test on a working flowmeter in a fluid line in a mobile flow online calibration system according to an embodiment of the invention.
Detailed Description
The following description will be provided in detail with reference to the accompanying drawings, which are not intended to limit the present invention, and all similar structures and similar variations using the present invention shall fall within the scope of the present invention.
As shown in fig. 1 to fig. 3, an embodiment of the present invention provides a mobile online flow calibration system, which is characterized in that: the system comprises a process data acquisition, compensation and diagnosis controller, a temperature transmitter and a pressure transmitter, and is used for detecting the temperature and the pressure in the operation process in real time;
the mobile flow calibration device comprises a base 10, and a fluid inlet valve 12, a fluid outlet valve 13, a reference Coriolis mass flowmeter 11, a process data acquisition, compensation and diagnosis controller 14, a pressure transmitter 15 and a temperature transmitter 16 which are respectively arranged on the base 10;
the fluid inlet of the fluid inlet valve 12 is provided with an inlet flange 121, the fluid outlet of the fluid inlet valve 12 is connected to the fluid inlet of the reference flowmeter 11, the fluid outlet of the reference flowmeter 11 is connected to the fluid inlet of the fluid outlet valve 13 through the pressure transmitter 15 and the temperature transmitter 16, the fluid outlet of the fluid outlet valve 13 is provided with an outlet flange 131, and the flow signal output port of the reference flowmeter 11 is connected to the calibration data acquisition port of the data acquisition controller 14;
during the test for the temperature influence of the mobile flow calibration device, the measuring medium (water) with different temperatures passes through the inlet flange 121, the fluid inlet valve 12, the reference coriolis mass flowmeter 11, the outlet valve 13 and the fluid outlet flange 131, so that the measuring medium (water) in the reference coriolis mass flowmeter is at the required temperature. The inlet valve 12 and the outlet valve 13 are shut off to bring the measured medium (water) in the reference coriolis mass flowmeter 11 to a standstill, to obtain the amount of temperature influence on the reference coriolis mass flowmeter 11, and to save the fitted curve in the process data acquisition, compensation and diagnostic controller 14.
Fig. 2 shows an example of a curve for fitting the temperature to the influence of the reference coriolis mass flowmeter 11, where the measured values of finite temperature points (e.g., 5 temperature points in the range of 0 ℃ to 50 ℃) are used to fit the influence of the zero point of the standard coriolis mass flowmeter on the operating medium temperature in a specific temperature range.
Process data acquisition, compensation and diagnostic controller 14 calculates a operating state confidence P for coriolis mass flowmeter 11 by acquiring flow, density, flowmeter drive gain, and detection coil signals corresponding to measured process parameters in mass flowmeter transmitter 111, the confidence P being related to the density of the measured medium in the operating state of the mass flowmeter, and the flowmeter drive gain magnitude and detection coil signal strength. The correlation between the confidence P and the density of the operating medium is obtained by experimental measurement statistical data, the flow meter driving gain is in a certain specific interval, the confidence P and the flow meter driving gain form a decreasing function relation, and the confidence P and the detection coil signal intensity form an increasing function relation; the operating confidence P of the coriolis mass flowmeter 11 is used as a parameter for judging whether the flowmeter operates in an accurate measurement state.
When the mobile flow calibration device is used for standard laboratory detection (generally constant temperature water is used as a detection medium), the calculated confidence coefficient of the operating state of the Coriolis mass flowmeter 11 is taken as a reference PB. Operating state confidence P of coriolis mass flowmeter 11 calculated during detection of work flow meter 31 under testACalculating the confidence P of the working state obtained by the working processAAnd the reference confidence degree PBThe ratio between the two is used as a basis for judging whether the flow meter meets the measurement accuracy range. When P is presentA/PBThe value is within the set threshold rangeThe detection data of the coriolis mass flowmeter 11 as the standard table can be determined to satisfy the accurate measurement condition, and the detection data can be used as the on-site calibration standard data.
In the embodiment of the present invention, the Coriolis mass flowmeter 11 is a Coriolis (Coriolis) mass flowmeter.
The embodiment of the invention is suitable for online calibration of the working flowmeter 31, and the use method comprises the following steps:
when calibrating a flowmeter 31 operating on a fluid pipeline by using a mobile flow calibrating device, an inlet flange and an outlet flange in the mobile flow calibrating device are respectively connected to a target pipeline by a pipe fitting and are positioned at the downstream of the target flowmeter to be calibrated, so that the fluid flowing through the target flowmeter 31 to be calibrated can completely flow through a Coriolis mass flowmeter 11 in the mobile flow calibrating device, such as the target pipeline shown in FIG. 3, a stop valve 33 is arranged at the downstream of the target flowmeter 31 to be calibrated, two bypass valves 32 and 34 are respectively arranged at two sides of the stop valve 33, a regulating valve 37 is arranged at the downstream of the bypass valve 34, the inlet in the mobile flow calibrating device is flanged to the bypass valve 32 by a hose 35, the outlet in the mobile flow calibrating device is flanged to the bypass valve 34 by a hose 36, then the regulating valve 37, the two bypass valves 32 and 34, the fluid inlet valve 12 and the fluid outlet valve 13 in the mobile flow calibration device are opened, and the shut-off valve 33 is closed, so that the fluid flowing through the target flowmeter 31 to be calibrated can completely flow through the reference flowmeter 11 in the mobile flow calibration device, the target flowmeter 31 can be calibrated by using the reference mass flowmeter 11, the flow rate required to be calibrated can be regulated by the downstream regulating valve 37, and the data acquisition controller 14 is used for acquiring the flow rate signal output by the reference flowmeter 11 and calculating the flow rate coefficient of the target flowmeter 31 to be calibrated according to the acquired value.
In calibrating the target flowmeter 31, the process data acquisition, compensation and diagnostic controller 14 measures the operating condition process media temperature via the temperature transmitter 16 based on the operating flowmeter normal operating flow and the zero offset contribution of the operating temperature reference mass flowmeter 11 based on the operating temperature and the calibration temperature offset.
For example: the normal operation flow of the on-site detected work flow meter 31 is 10t/h, the operation temperature is 28 ℃, and the medium temperature of the mobile flow calibration device is 22 ℃ during standard laboratory detection. By fitting a curve to the zero influence value of coriolis mass flowmeter 11 with the temperature in process data acquisition, compensation and diagnostic controller 14, it is determined that coriolis mass flowmeter 11 will produce a +1.5kg/h influence at the operating flowmeter operating temperature of 28 ℃ as a calibration chart, from which the measurement effect due to zero offset is calculated as:
(+1.5/10000)*100％＝+0.015％
when finally determining the meter coefficient of the working flowmeter to be detected, the influence needs to be comprehensively calculated into the deviation.
The process data acquisition, compensation and diagnostic controller 14 calculates the operating state confidence of the coriolis mass flowmeter 11 by acquiring the flow, density, flowmeter drive gain, and detection coil signals corresponding to the measured process parameters in the mass flowmeter transmitter 111. When calculating PA/PBThe value is within the set threshold value range, the detection data of the coriolis mass flowmeter 11 serving as the standard table can be determined to meet the accurate measurement condition, and the detection data is valid.
By the above method, the accurate measurement and the reliability of the data of the coriolis mass flowmeter 11 as the calibration chart are ensured.
Claims (4)
1. A mobile flow online calibration system is characterized by comprising a process data acquisition, compensation and diagnosis controller, a temperature transmitter and a pressure transmitter, wherein the temperature transmitter and the pressure transmitter detect the temperature and the pressure of an operation process in real time and realize online real-time compensation and diagnosis on a measurement process;
in the rated temperature range of an operating system, the influence quantity of the operating temperature on the zero point of the Coriolis mass flowmeter is fitted by measuring different temperature points;
parameters were measured by a real-time acquired baseline coriolis mass flowmeter: flow, density, drive gain and detection coil signal parameters, calculating the confidence P of the operating state of the Coriolis mass flowmeter, and determining the detection data of the Coriolis mass flowmeter serving as a standard table to be used as field calibration standard data;
the mobile flow online calibration system collects real-time operation temperature of a process medium by using a process data collection, compensation and diagnosis controller and a temperature transmitter, and compensates the influence of different operation temperatures on a reference Coriolis mass flowmeter in real time.
2. The mobile on-line flow calibration system of claim 1, comprising a process data acquisition, compensation and diagnostic controller, a temperature transmitter, a pressure transmitter, a mobile on-line flow calibration system base, and a fluid inlet valve, a fluid outlet valve, a reference coriolis mass flowmeter, each mounted to the base.
3. The mobile online flow calibration system of claim 1, wherein the process data acquisition, compensation and diagnostic controller online calibration system manufacturing process: for a reference Coriolis mass flowmeter in a rated use temperature range, measuring the working zero point of the flowmeter under different operating temperature conditions by using a calibration medium in a laboratory, fitting a temperature and zero point influence curve, and storing temperature influence data in a controller.
4. The mobile online flow calibration system of claim 1, wherein the process data acquisition, compensation and diagnostic controller calculates the operating state confidence P of the coriolis mass flowmeter during a factory calibration of the mobile online flow calibration system using the flow rate, density, flowmeter drive gain, and detection coil signals during the sensing process during a laboratory calibration process, and the calculation is stored in the controller as a device reference.
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| CN202111042131.2A CN113899431A (en) | 2021-09-07 | 2021-09-07 | Mobile flow online calibration system |
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| CN202111042131.2A CN113899431A (en) | 2021-09-07 | 2021-09-07 | Mobile flow online calibration system |
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Cited By (2)
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| CN115773797A (en) * | 2023-02-10 | 2023-03-10 | 成都秦川物联网科技股份有限公司 | Intelligent gas flow correction method, internet of things system, device and medium |
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