CN111623856A - Online in-situ calibration method and device for natural gas ultrasonic flowmeter - Google Patents
Online in-situ calibration method and device for natural gas ultrasonic flowmeter Download PDFInfo
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Abstract
The invention discloses an online in-situ calibration method and device for a natural gas ultrasonic flowmeter, relates to the technical field of metering calibration, and solves the problem that the conventional fixed pipeline natural gas ultrasonic flowmeter needs to be detached for calibration and cannot realize on-site in-situ calibration. The main technical scheme of the invention is as follows: installing a standard ultrasonic flowmeter, and installing the standard ultrasonic flowmeter to the adjacent position of the ultrasonic flowmeter to be measured; calibrating the indicating value error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter; the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are positioned on the same straight pipe section of the pipeline. The method is mainly used for calibrating the natural gas ultrasonic flowmeter.
Description
Technical Field
The invention relates to the technical field of measurement calibration, in particular to an online in-situ calibration method and device for a natural gas ultrasonic flowmeter.
Background
The metering of natural gas flow is an extremely important part in the natural gas pipeline industry, and the accuracy of the measured data directly influences the economic benefit of a production enterprise and the benefit of a user. In recent years, many users have started to use a fixed multi-channel ultrasonic flowmeter as a natural gas meter in a large number, the ultrasonic flowmeter measures the flow rate of natural gas by using a propagation time difference method, the propagation time difference method ultrasonic flowmeter works by using ultrasonic transducers to alternately (or simultaneously) transmit and receive ultrasonic pulses in opposite directions, indirectly measure the flow rate of fluid by detecting and calculating the propagation time difference between forward flow and backward flow of a medium, and then calculate the flow rate by using the flow rate. However, the existing fixed pipeline natural gas ultrasonic wave metering meter needs to be detached and disassembled for calibration.
Disclosure of Invention
In view of this, the embodiment of the invention provides an online in-situ calibration method and device for a natural gas ultrasonic flowmeter, and mainly aims to solve the problem that the existing fixed pipeline natural gas ultrasonic meter needs to be detached for calibration and cannot be calibrated in situ on site. In order to achieve the purpose, the invention mainly provides the following technical scheme:
in one aspect, an embodiment of the present invention provides an online in-situ calibration method for a natural gas ultrasonic flowmeter, where the calibration method for a natural gas flowmeter includes: installing a standard ultrasonic flowmeter, and installing the standard ultrasonic flowmeter to the adjacent position of the ultrasonic flowmeter to be measured;
calibrating the indicating value error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter;
the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are positioned on the same straight pipe section of the pipeline.
Optionally, calibrating the indication error of the to-be-measured ultrasonic flowmeter according to the indication of the standard ultrasonic flowmeter specifically includes:
acquiring an accumulated flow indicating value of the standard ultrasonic flowmeter within a first preset time, calculating an indicating value error of the ultrasonic flowmeter to be measured according to a formula (1) through the accumulated flow indicating value of the ultrasonic flowmeter to be measured,
ΔV＝Vi-V0(1)
wherein Δ V is an indication error of the accumulated flow of the ultrasonic flowmeter to be measured in a first preset time, L or m3；
ViAn indication value of the accumulated flow of the ultrasonic flowmeter to be measured in a first preset time, L or m3；
V0An indication of the cumulative flow rate, L or m, of the standard ultrasonic flowmeter over a first predetermined time3。
Optionally, calibrating the measurement repeatability of the ultrasonic flowmeter to be measured according to the indication value of the standard ultrasonic flowmeter specifically includes:
reading the accumulated flow indicating value of the standard ultrasonic flowmeter at least n times every second preset time interval, and calculating the arithmetic mean value as a first standard value;
reading the accumulated flow indicating value of the ultrasonic flowmeter to be measured at least n times every second preset time interval, and calculating the arithmetic mean value of the accumulated flow indicating value as a first measuring value;
and calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to the first standard value and the first measured value.
Optionally, the calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to the first standard value and the first measurement value specifically includes:
calculating the difference value between the first measurement value and the first standard value, if the difference value is less than or equal to the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the repeatability of the ultrasonic flowmeter to be measured according to a formula (2), and if the difference value is greater than the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to a formula (3),
wherein S isnThe measurement repeatability of the ultrasonic flowmeter to be measured is obtained;
Vithe value of the cumulative flow for the ith measurement of the ultrasonic flowmeter to be measured, L or m3；
Vi0Is the first measured value, L or m, of the ultrasonic flow meter under test3；
V0Is the first standard value, L or m, of the standard ultrasonic flow meter3。
Optionally, the value of n is 10.
Optionally, calibrating the measurement stability of the to-be-measured ultrasonic flowmeter according to the indication value of the standard ultrasonic flowmeter specifically includes:
reading the accumulated flow indication value of the standard ultrasonic flowmeter at least s times every second preset time interval, and calculating the arithmetic mean value as a second standard value;
reading the accumulated flow indication value of the ultrasonic flowmeter to be measured at least s times every second preset time interval, testing one group at every preset number of days, testing at least m groups, and calculating the arithmetic mean value as a second measurement value;
and calculating the measurement stability of the ultrasonic flowmeter to be measured according to the second standard value and the second measured value.
Optionally, the calculating the measurement stability of the ultrasonic flowmeter to be measured according to the second standard value and the second measured value specifically includes:
calculating the difference value between the second measurement value and the second standard value, if the difference value is less than or equal to the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement stability of the ultrasonic flowmeter to be measured according to a formula (4), and if the difference value is greater than the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement stability of the ultrasonic flowmeter to be measured according to a formula (5),
wherein S ismThe measurement repeatability of the ultrasonic flowmeter to be measured is obtained;
Optionally, s is 10, and m is 4.
In another aspect, an embodiment of the present invention provides an online in-situ calibration device for a natural gas ultrasonic flowmeter, where the online in-situ calibration device for a natural gas ultrasonic flowmeter includes: the ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter are arranged on the same straight line pipe section of the pipeline;
the standard ultrasonic flowmeter is an external clamp type ultrasonic flowmeter.
Optionally, the distance between the ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter is 10-20 cm.
The on-line in-situ calibration method and the device for the natural gas ultrasonic flowmeter, which are provided by the embodiment of the invention, aim at the calibration of the ultrasonic flowmeter to be measured of a fixed pipeline, the calibration method provided by the embodiment is to install the calibrated standard ultrasonic flowmeter as the standard flowmeter to carry out synchronous measurement, the standard ultrasonic flowmeter is calibrated, a worker already masters the uncertainty and the accumulated flow correction value in the measurement range, the standard ultrasonic flowmeter is installed at the adjacent position of the ultrasonic flowmeter to be measured and ensures that the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are positioned on the same straight pipe section of the same pipeline, and the indication error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured can be calibrated according to the indication value of the standard ultrasonic flowmeter based on the principle that the accumulated flow numbers of the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are, the ultrasonic flowmeter to be measured can be calibrated in situ without separation and disassembly operations.
Drawings
Fig. 1 is a schematic flow chart of an online in-situ calibration method for a natural gas ultrasonic flowmeter according to an embodiment of the present invention;
fig. 2 is another schematic flow chart of an online in-situ calibration method for a natural gas ultrasonic flowmeter according to an embodiment of the present invention.
Detailed Description
To further illustrate the technical means and effects of the present invention adopted to achieve the predetermined objects, the following detailed description will be given to the method and apparatus for on-line in-situ calibration of a natural gas ultrasonic flowmeter according to the present invention, and the specific implementation, structure, features and effects thereof, with reference to the accompanying drawings and preferred embodiments.
Example one
Referring to fig. 1 and fig. 2, an embodiment of the present invention provides an online in-situ calibration method for a natural gas ultrasonic flowmeter, where the online in-situ calibration method for the natural gas ultrasonic flowmeter includes:
step 1, installing a standard ultrasonic flowmeter, and installing the standard ultrasonic flowmeter to an adjacent position of an ultrasonic flowmeter to be measured;
step 2, calibrating the indicating value error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter;
the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are positioned on the same straight pipe section of the pipeline.
Specifically, in this embodiment, for calibration of a fixed pipeline natural gas ultrasonic flowmeter (hereinafter referred to as an ultrasonic flowmeter to be calibrated), at present, the ultrasonic flowmeter to be calibrated needs to be detached and disassembled, and there is no procedure and method for in-situ calibration on site, which is tedious in operation and affects calibration efficiency. For the ultrasonic flowmeter to be measured with the air pressure in the wall higher than 0.6MPa, a calibrated external clamping type ultrasonic flowmeter (hereinafter referred to as a standard ultrasonic flowmeter) can be used as the standard flowmeter for synchronous measurement, the standard ultrasonic flowmeter is calibrated, and workers know the uncertainty and the accumulated flow correction value in the measurement range of the standard ultrasonic flowmeter; the specific installation position of the standard ultrasonic flowmeter can be set according to actual conditions, the smaller the distance between the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured, the better the distance, and the accuracy of a calibration result can be improved; after the standard ultrasonic flowmeter is installed, based on the principle that the accumulated flow numbers of the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are consistent in a period of time, the indication error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured can be calibrated according to the indication value of the standard ultrasonic flowmeter, wherein the measurement repeatability refers to the capability of repeatedly measuring the same measurement under the same condition, the flowmeter provides similar indication numbers, and the measurement stability refers to the capability of keeping the working condition constant and keeping the measurement indication numbers of the flowmeter unchanged in a specified time, namely the capability of keeping the measurement characteristics constant along with the time.
According to the above list, the embodiment of the present invention provides an online in-situ calibration method for a natural gas ultrasonic flowmeter, aiming at the calibration of a fixed pipeline ultrasonic flowmeter to be measured, the calibration method provided in this embodiment is to install a calibrated standard ultrasonic flowmeter as a standard flowmeter to perform synchronous measurement, the standard ultrasonic flowmeter has been calibrated, a worker has mastered uncertainty and an accumulated flow correction value within a measurement range of the standard ultrasonic flowmeter, install the standard ultrasonic flowmeter at an adjacent position of the ultrasonic flowmeter to be measured, and ensure that the standard ultrasonic flowmeter and the standard ultrasonic flowmeter are located on a same straight pipe section of a same pipeline, based on a principle that accumulated flow numbers of the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are consistent within a period of time, the indication error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured are calibrated according to the indication value of the standard, the ultrasonic flowmeter to be measured can be calibrated in situ without separation and disassembly operations.
Further, referring to fig. 2, in a specific implementation, the calibrating, in step 2, the indication error of the ultrasonic flowmeter to be measured according to the indication of the standard ultrasonic flowmeter is specifically:
step 2.1, acquiring an accumulated flow indicating value of the standard ultrasonic flowmeter within a first preset time, calculating an indicating value error of the ultrasonic flowmeter to be detected according to a formula (1) through the accumulated flow indicating value of the ultrasonic flowmeter to be detected,
ΔV＝Vi-V0(1)
wherein Δ V is an indication error of the accumulated flow of the ultrasonic flowmeter to be measured in a first preset time, L or m3；
ViAn indication value of the accumulated flow of the ultrasonic flowmeter to be measured in a first preset time, L or m3；
V0An indication of the cumulative flow rate, L or m, of the standard ultrasonic flowmeter over a first predetermined time3。
Specifically, in order to calculate and obtain the indication error of the ultrasonic flowmeter to be measured, in the technical scheme adopted by the invention, under the condition that the flow inside the pipeline is stable, the first preset time is respectively obtainedCumulative flow indication V of internal standard ultrasonic flowmeter0And the accumulated flow indication value V of the ultrasonic flowmeter to be measurediThe accumulated flow rate of the standard ultrasonic flowmeter and the accumulated flow rate of the ultrasonic flowmeter to be measured are consistent in a period of time, and the accumulated flow rate of the standard ultrasonic flowmeter is used for indicating a value V0And (3) calculating to obtain the indicating value error of the ultrasonic flowmeter to be measured through a formula (1) as a standard value.
Further, referring to fig. 2, in a specific implementation, the calibrating the measurement repeatability of the ultrasonic flowmeter to be measured according to the indication value of the standard ultrasonic flowmeter in step 2 specifically includes:
step 2.2.1, reading the accumulated flow indication value of the standard ultrasonic flowmeter for at least n times at intervals of second preset time, and calculating the arithmetic mean value as a first standard value;
step 2.2.2, reading the accumulated flow indication value of the ultrasonic flowmeter to be measured at least n times at intervals of second preset time, and calculating the arithmetic mean value as a first measurement value;
and 2.2.3, calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to the first standard value and the first measurement value.
Specifically, the measurement repeatability refers to the capability of repeatedly measuring the same measured quantity under the same condition, the flowmeter provides similar indicatrix, and in order to obtain the measurement repeatability of the ultrasonic flowmeter to be measured, in the technical scheme adopted by the invention, under the condition that the flow in the pipeline is stable, the accumulated flow indication value V of the standard ultrasonic flowmeter is read at least n times at intervals of second preset time0iTaking the arithmetic mean value as the first standard value V0，V0Can be calculated by equation (6):
the second preset time may be 10 minutes, and the value of n may be 10, but is not limited thereto; and reading the ultrasonic flowmeter to be measured at least n times at intervals of second preset timeFlow rate indicating value ViTaking the arithmetic mean value as Vi0As the first measured value, Vi0And V0Same, mixing ViSubstituting into formula (6), and passing through the first standard value V0And a first measured value Vi0The measurement repeatability of the ultrasonic flow meter under test is calculated, as will be described in detail below.
Further, referring to fig. 2, in an implementation, in step 2.2.3, calculating measurement repeatability of the ultrasonic flow meter to be measured according to the first standard value and the first measurement value specifically includes:
step 2.2.3.1, calculating a difference between the first measurement value and the first standard value, if the difference is smaller than or equal to the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the repeatability of the ultrasonic flowmeter to be measured according to a formula (2), if the difference is larger than the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to a formula (3),
wherein S isnThe measurement repeatability of the ultrasonic flowmeter to be measured is obtained;
Vithe value of the cumulative flow for the ith measurement of the ultrasonic flowmeter to be measured, L or m3；
Vi0Is the first measured value, L or m, of the ultrasonic flow meter under test3；
V0Is the first standard value, L or m, of the standard ultrasonic flow meter3。
Specifically, in the technical scheme adopted by the invention, the first measurement value V is calculatedi0And a first standard value V0And is compared with the maximum allowable error | MPE | of the ultrasonic flowmeter to be measured,if Vi0-V0MPE | ≦ the first measurement value V is used as in equation (2)i0And the value V of the cumulative flow measured for the ith time of the ultrasonic flowmeter to be measurediCalculating the repeatability of the ultrasonic flowmeter to be measured; when V isi0-V0>If MPE | is satisfied, the first standard value V is used according to the formula (3)0And the value V of the cumulative flow measured for the ith time of the ultrasonic flowmeter to be measurediAnd calculating the repeatability of the ultrasonic flowmeter to be measured.
Further, in a specific implementation, the value of n may be 10.
Further, referring to fig. 2, in a specific implementation, the calibrating the measurement stability of the to-be-measured ultrasonic flowmeter according to the indication value of the standard ultrasonic flowmeter in step 2 specifically includes:
step 2.3.1, reading the accumulated flow of the standard ultrasonic flowmeter at least s times at intervals of second preset time, and calculating the arithmetic mean value as a second standard value;
step 2.3.2, reading the accumulated flow of the ultrasonic flowmeter to be tested at least s times at intervals of second preset time, testing one group at intervals of preset days, testing at least m groups, and calculating the arithmetic mean value of the test values as a second measurement value;
and 2.3.3, calculating the measurement stability of the ultrasonic flowmeter to be measured according to the second standard value and the second measured value.
Specifically, the measurement stability refers to the capability of keeping constant under working conditions, and the measurement index of the flow meter remains unchanged within a specified time, that is, the capability of keeping constant the measurement characteristic with time, in order to obtain the measurement stability of the ultrasonic flow meter to be measured, in the technical scheme adopted by the invention, under the condition that the flow rate inside the pipeline is stable, a second standard value is firstly determined, and at least s times of obtaining the accumulated flow rate index of the standard ultrasonic flow meter are carried out every second preset time, the step can be the same as the step 2.2.1, the second preset time can also be 10 minutes, s can be 10, and the average value is taken as a second standard value V0mOr substituting the corresponding numerical value into the formula (6) to obtainObtaining; secondly, reading the accumulated flow indication value V of the ultrasonic flowmeter to be measured for at least s times at intervals of second preset timeiAnd testing one group at intervals of preset days, testing at least m groups, and calculating the arithmetic mean value thereof as a second measured value VimThen, the second standard value V can be passed0mAnd a second measured value VimThe measurement stability of the ultrasonic flowmeter to be measured is calculated, which will be described in detail below.
Further, referring to fig. 2, in an implementation, in step 2.3.3, calculating the measurement stability of the ultrasonic flowmeter to be measured according to the second standard value and the second measured value specifically includes:
step 2.3.3.1, calculating a difference value between the second measurement value and the second standard value, if the difference value is less than or equal to the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement stability of the ultrasonic flowmeter to be measured according to a formula (4), and if the difference value is greater than the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement stability of the ultrasonic flowmeter to be measured according to a formula (5),
wherein S ismThe measurement repeatability of the ultrasonic flowmeter to be measured is obtained;
Specifically, in the technical scheme adopted by the invention, the second measurement value V is calculatedimAnd a second standard value V0mAnd comparing the difference value with the maximum allowable error | MPE | of the ultrasonic flowmeter to be measured, if V isim-V0mMPE | ≦ second measurement value V according to equation (4)imThe arithmetic mean value of the flow rate of the ultrasonic flowmeter to be measured and the arithmetic mean value of the cumulative flow rate of the mth measurement
Calculating the repeatability of the ultrasonic flowmeter to be measured; when V isim-V0m>If MPE | is satisfied, the second standard value V is used according to the formula (5)0mThe arithmetic mean value of the flow rate of the ultrasonic flowmeter to be measured and the arithmetic mean value of the cumulative flow rate of the mth measurement
And calculating the repeatability of the ultrasonic flowmeter to be measured.
In a specific implementation, s may be 10, and m may be 4, but is not limited thereto.
Example two
The embodiment of the invention provides an online in-situ calibration device of a natural gas ultrasonic flowmeter, which is applied to the online in-situ calibration method of the natural gas ultrasonic flowmeter, and comprises the following components: the ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter are arranged on the same straight line pipe section of the pipeline; the standard ultrasonic flowmeter is an external clamp type ultrasonic flowmeter.
Specifically, for the ultrasonic flowmeter to be measured with the air pressure in the wall higher than 0.6MPa, a calibrated external clip type ultrasonic flowmeter (hereinafter referred to as a standard ultrasonic flowmeter) can be used as a standard flowmeter for synchronous measurement, the standard ultrasonic flowmeter is calibrated, and a worker knows the uncertainty and the accumulated flow correction value in the measurement range of the standard ultrasonic flowmeter; the specific installation position of the standard ultrasonic flowmeter can be set according to actual conditions, the smaller the distance between the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured, the better the distance, and the accuracy of a calibration result can be improved; after the standard ultrasonic flowmeter is arranged, based on the principle that the accumulated flow rates of the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are consistent in a period of time, the indicating value error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured can be calibrated according to the indicating value of the standard ultrasonic flowmeter.
In light of the above, the embodiment of the present invention provides an in-situ calibration apparatus for a natural gas ultrasonic flowmeter, installing a calibrated standard ultrasonic flowmeter on a pipeline as a standard flowmeter for synchronous measurement, wherein the standard ultrasonic flowmeter is calibrated, a worker grasps the uncertainty and the accumulated flow correction value in the measurement range, installs the standard ultrasonic flowmeter at the adjacent position of the ultrasonic flowmeter to be measured and ensures that the standard ultrasonic flowmeter and the ultrasonic flowmeter are positioned on the same straight line pipe section of the same pipeline, based on the principle that the accumulated flow rates of the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are consistent in a period of time, according to the indicating value calibration of the standard ultrasonic flowmeter, the indicating value error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured can be calibrated in situ, and the ultrasonic flowmeter to be measured does not need to be separated and detached.
Further, in specific implementation, the distance between the ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter is 10-20 cm.
Specifically, in order to improve the accuracy of calibration of the ultrasonic flowmeter to be measured, in the technical scheme adopted by the invention, when the standard ultrasonic flowmeter is installed, the distance between the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured is reduced as much as possible, and the distance between the specific ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter can be 10-20 cm.
It should be noted that in the description of the present specification, the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present invention; the terms "connected," "mounted," "secured," and the like are to be construed broadly and include, for example, fixed connections, removable connections, or integral connections; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description herein, the description of the terms "one embodiment," "some embodiments," "specific embodiments," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. An online in-situ calibration method for a natural gas ultrasonic flowmeter is characterized by comprising the following steps:
installing a standard ultrasonic flowmeter, and installing the standard ultrasonic flowmeter to the adjacent position of the ultrasonic flowmeter to be measured;
calibrating the indicating value error, the measurement repeatability and the measurement stability of the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter;
the standard ultrasonic flowmeter and the ultrasonic flowmeter to be measured are positioned on the same straight pipe section of the pipeline.
2. The method of on-line in-situ calibration of an ultrasonic natural gas flow meter according to claim 1,
the calibration of the indicating value error of the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter is specifically as follows:
acquiring an accumulated flow indicating value of the standard ultrasonic flowmeter within a first preset time, calculating an indicating value error of the ultrasonic flowmeter to be measured according to a formula (1) through the accumulated flow indicating value of the ultrasonic flowmeter to be measured,
ΔV＝Vi-V0(1)
wherein Δ V is an indication error of the accumulated flow of the ultrasonic flowmeter to be measured in a first preset time, L or m3；
ViAn indication value of the accumulated flow of the ultrasonic flowmeter to be measured in a first preset time, L or m3；
V0An indication of the cumulative flow rate, L or m, of the standard ultrasonic flowmeter over a first predetermined time3。
3. The on-line in-situ calibration of a natural gas ultrasonic flow meter according to claim 1,
the measurement repeatability for calibrating the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter is specifically as follows:
reading the accumulated flow indicating value of the standard ultrasonic flowmeter at least n times every second preset time interval, and calculating the arithmetic mean value as a first standard value;
reading the accumulated flow indicating value of the ultrasonic flowmeter to be measured at least n times every second preset time interval, and calculating the arithmetic mean value of the accumulated flow indicating value as a first measuring value;
and calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to the first standard value and the first measured value.
4. The method of on-line in-situ calibration of an ultrasonic natural gas flow meter according to claim 3,
the calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to the first standard value and the first measurement value specifically comprises:
calculating the difference value between the first measurement value and the first standard value, if the difference value is less than or equal to the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the repeatability of the ultrasonic flowmeter to be measured according to a formula (2), and if the difference value is greater than the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement repeatability of the ultrasonic flowmeter to be measured according to a formula (3),
wherein S isnThe measurement repeatability of the ultrasonic flowmeter to be measured is obtained;
Vithe value of the cumulative flow for the ith measurement of the ultrasonic flowmeter to be measured, L or m3；
Vi0Is the first measured value, L or m, of the ultrasonic flow meter under test3；
V0Is the first standard value, L or m, of the standard ultrasonic flow meter3。
5. The method of on-line in-situ calibration of an ultrasonic natural gas flow meter according to claim 3,
n has a value of 10.
6. The method of on-line in-situ calibration of an ultrasonic natural gas flow meter according to claim 1,
the calibration of the measurement stability of the ultrasonic flowmeter to be measured according to the indicating value of the standard ultrasonic flowmeter is specifically as follows:
reading the accumulated flow indication value of the standard ultrasonic flowmeter at least s times every second preset time interval, and calculating the arithmetic mean value as a second standard value;
reading the accumulated flow indication value of the ultrasonic flowmeter to be measured at least s times every second preset time interval, testing one group at every preset number of days, testing at least m groups, and calculating the arithmetic mean value as a second measurement value;
and calculating the measurement stability of the ultrasonic flowmeter to be measured according to the second standard value and the second measured value.
7. The method of on-line in-situ calibration of an ultrasonic natural gas flow meter according to claim 6,
the step of calculating the measurement stability of the ultrasonic flowmeter to be measured according to the second standard value and the second measured value specifically includes:
calculating the difference value between the second measurement value and the second standard value, if the difference value is less than or equal to the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement stability of the ultrasonic flowmeter to be measured according to a formula (4), and if the difference value is greater than the maximum allowable error of the ultrasonic flowmeter to be measured, calculating the measurement stability of the ultrasonic flowmeter to be measured according to a formula (5),
wherein S ismThe measurement repeatability of the ultrasonic flowmeter to be measured is obtained;
8. The method of on-line in-situ calibration of an ultrasonic natural gas flow meter according to claim 6,
s has a value of 10 and m has a value of 4.
9. An on-line in-situ calibration device for a natural gas ultrasonic flowmeter, which is applied to the on-line in-situ calibration method for the natural gas ultrasonic flowmeter as claimed in any one of claims 1 to 8, and is characterized by comprising the following steps:
the ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter are arranged on the same straight line pipe section of the pipeline;
the standard ultrasonic flowmeter is an external clamp type ultrasonic flowmeter.
10. The in-situ calibration device for a natural gas ultrasonic flowmeter according to claim 9,
the distance between the ultrasonic flowmeter to be measured and the standard ultrasonic flowmeter is 10-20 cm.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833998A (en) * | 2020-12-31 | 2021-05-25 | 广东省计量科学研究院（华南国家计量测试中心） | Online calibration method for pipeline type liquid flowmeter |
| CN112964337A (en) * | 2021-03-17 | 2021-06-15 | 成都千嘉科技有限公司 | Calibration system and method applied to ultrasonic gas meter |
| CN113008336A (en) * | 2021-02-18 | 2021-06-22 | 合肥工业大学 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
| CN113514621A (en) * | 2021-09-14 | 2021-10-19 | 成都千嘉科技有限公司 | Method for testing dynamic performance of gas sensor |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358872A (en) * | 2008-09-28 | 2009-02-04 | 别振丽 | On-sit calibrating method and apparatus for gas meter for household use |
| CN102928053A (en) * | 2011-08-08 | 2013-02-13 | 上海大众燃气有限公司 | Device for calibrating natural gas on line |
| CN103278221A (en) * | 2013-06-07 | 2013-09-04 | 重庆前卫克罗姆表业有限责任公司 | Detection equipment used for finished intelligent meter |
| RU2015106750A (en) * | 2015-02-26 | 2016-09-20 | Частное акционерное общество "Тахион" | METHOD FOR TESTING AND CALIBRATING GAS METERS |
| JP2017040601A (en) * | 2015-08-21 | 2017-02-23 | アズビル株式会社 | Test method and test device for liquid flowmeter |
| CN210198509U (en) * | 2019-07-18 | 2020-03-27 | 洛阳西苑车辆与动力检验所有限公司 | Synchronous measuring device for calibrating fuel flow meter |
-
2020
- 2020-06-19 CN CN202010563580.0A patent/CN111623856A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101358872A (en) * | 2008-09-28 | 2009-02-04 | 别振丽 | On-sit calibrating method and apparatus for gas meter for household use |
| CN102928053A (en) * | 2011-08-08 | 2013-02-13 | 上海大众燃气有限公司 | Device for calibrating natural gas on line |
| CN103278221A (en) * | 2013-06-07 | 2013-09-04 | 重庆前卫克罗姆表业有限责任公司 | Detection equipment used for finished intelligent meter |
| RU2015106750A (en) * | 2015-02-26 | 2016-09-20 | Частное акционерное общество "Тахион" | METHOD FOR TESTING AND CALIBRATING GAS METERS |
| JP2017040601A (en) * | 2015-08-21 | 2017-02-23 | アズビル株式会社 | Test method and test device for liquid flowmeter |
| CN210198509U (en) * | 2019-07-18 | 2020-03-27 | 洛阳西苑车辆与动力检验所有限公司 | Synchronous measuring device for calibrating fuel flow meter |
Non-Patent Citations (5)
| Title |
|---|
| 侯阳 等: "标准表法工作级计量标准的建立", 《山东工业技术》 * |
| 刘丁发: "并联式标准表法气体流量标准装置研究", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
| 国家质量监督检验检疫总局: "标准表法流量标准装置检定规程：JJG 643-2003", 《中华人民共和国国家计量检定规程》 * |
| 国家质量监督检验检疫总局: "计量标准考核规范：JJG 1033-2016", 《中华人民共和国国家计量检定规程》 * |
| 邓鸿炳: "便携式超声波流量计检定方法与装置研发", 《中国优秀博硕士学位论文全文数据库(硕士)工程科技Ⅱ辑》 * |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112833998A (en) * | 2020-12-31 | 2021-05-25 | 广东省计量科学研究院（华南国家计量测试中心） | Online calibration method for pipeline type liquid flowmeter |
| CN113008336A (en) * | 2021-02-18 | 2021-06-22 | 合肥工业大学 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
| CN113008336B (en) * | 2021-02-18 | 2022-07-12 | 重庆川仪自动化股份有限公司 | Method for realizing permanent magnet sodium flowmeter cross-correlation method in-situ calibration based on error correction |
| CN112964337A (en) * | 2021-03-17 | 2021-06-15 | 成都千嘉科技有限公司 | Calibration system and method applied to ultrasonic gas meter |
| CN112964337B (en) * | 2021-03-17 | 2024-03-29 | 成都千嘉科技有限公司 | Calibration system and method applied to ultrasonic gas meter |
| CN113514621A (en) * | 2021-09-14 | 2021-10-19 | 成都千嘉科技有限公司 | Method for testing dynamic performance of gas sensor |
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