CN113884164A - Self-adaptive calibration method of ultrasonic gas meter - Google Patents
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Abstract
The invention relates to a self-adaptive calibration method of an ultrasonic gas meter, which comprises the following steps: s1, detecting gas components in the current environment; s2, collecting the temperature under the current environment; s3, collecting the gas flow under the current environment; and S4, performing self-adaptive calibration on the ultrasonic gas meter according to the gas components, the temperature and the gas flow rate of the current environment and the pre-obtained three-dimensional array of the calibration coefficient. The calibration method of the invention is used for self-adaptive calibration of the ultrasonic gas meter according to the on-site environment temperature, gas components and flow rate, thereby improving the metering accuracy of the gas meter.
Description
Technical Field
The invention relates to the technical field of gas meters, in particular to a self-adaptive calibration method of an ultrasonic gas meter.
Background
The ultrasonic gas meter is a gas metering device which measures the gas flow rate by adopting the time difference method principle, and reflects the flow rate of fluid by measuring the difference of the forward flow and reverse flow propagation speed of ultrasonic signals in the fluid. The time difference method has the advantages of small error caused by the change of the sound velocity along with the temperature of the fluid, high accuracy and wide application at present. The ultrasonic gas meter needs to be calibrated before leaving the factory, so that the metering is accurate and uniform. At present, the calibration means of the ultrasonic gas meter is performed in an air environment and at normal temperature, but the ultrasonic gas meter actually works in gas states of various temperature environments, different gas components and the like, so that the measurement accuracy difference of the ultrasonic gas meter after air unified calibration is large in use environments of different temperatures and different gas components.
Disclosure of Invention
The invention aims to improve the metering accuracy of an ultrasonic gas meter in the using process and provides a self-adaptive calibration method of the ultrasonic gas meter.
In order to achieve the above object, the embodiments of the present invention provide the following technical solutions:
s1, detecting gas components in the current environment;
s2, collecting the temperature under the current environment;
s3, collecting the gas flow under the current environment;
and S4, performing self-adaptive calibration on the ultrasonic gas meter according to the gas components, the temperature and the gas flow of the current environment and the pre-obtained three-dimensional array of the calibration coefficients.
In the step S4, if the gas component x, the temperature t, and the gas flow q of the current environment have corresponding point coincidences in the three-dimensional array of the calibration coefficients, the calibration coefficient k value of the coincident point is directly used for adaptive calibration; and if no corresponding point is superposed, determining a calibration coefficient used as the self-adaptive calibration from a plurality of calibration coefficient point k values closest to the three-dimensional coordinate point (t, x, q).
The step of determining a calibration coefficient used for adaptive calibration from a plurality of calibration coefficient point k values closest to the three-dimensional coordinate point (t, x, q) includes:
s41, based on the three-dimensional array of calibration coefficients, according to the obtained temperature t, gas component x and flow q at the current moment, searching the calibration coefficient k values of eight points closest to the three-dimensional coordinate point (t, x, q), wherein the values are respectively as follows: k (t1, x1, q1), k (t1, x1, q2), k (t1, x2, q1), k (t1, x2, q2), k (t2, x1, q1), k (t2, x1, q2), k (t2, x2, q1), k (t2, x2, q2), where t1 ≦ t2, x1 ≦ x2, q1 ≦ q 2;
s42, calculating an intermediate point 1 from the calibration coefficients k (t1, x1, q1) and k (t1, x1, q2) by using the following formula:
k(t1,x1,q)=(q2-q)/(q2-q1)* k(t1,x1,q1)+ (q-q1)/(q2-q1)* k(t1,x1,q2)；
the intermediate point 2 is calculated from k (t1, x2, q1) and k (t1, x2, q2) by using the following equations:
k(t1,x2,q)=(q2-q)/(q2-q1)* k(t1,x2,q1)+ (q-q1)/(q2-q1)* k(t1,x2,q2)；
the intermediate point 3 is calculated from k (t2, x1, q1) and k (t1, x1, q2) by the following formula:
k(t2,x1,q)=(q2-q)/(q2-q1)* k(t2,x1,q1)+ (q-q1)/(q2-q1)* k(t2,x1,q2)；
the intermediate point 4 is calculated from k (t2, x2, q1) and k (t2, x2, q2) by using the following equations:
k(t2,x2,q)=(q2-q)/(q2-q1)* k(t2,x2,q1)+ (q-q1)/(q2-q1)* k(t2,x2,q2)；
at S43, the intermediate point 5 is calculated from k (t1, x1, q) and k (t2, x1, q) by the following formula:
k(t,x1,q)=(t2-t)/(t2-t1)* k(t1,x1,q)+ (t-t1)/(t2-t1)* k(t2,x1,q)；
the intermediate point 6 is calculated from k (t1, x2, q), k (t2, x2, q) using the following formula:
k(t,x2,q)=(t2-t)/(t2-t1)* k(t1,x2,q)+ (t-t1)/(t2-t1)* k(t2,x2,q)；
at S44, an intermediate point 7 is calculated from k (t, x1, q) and k (t, x2, q) by the following formula:
k (t, x, q) = (x2-x)/(x2-x1) × k (t, x1, q) + (x-x1)/(x2-x1) × k (t, x2, q), and the intermediate point 7 is a calibration coefficient corresponding to the current gas component, temperature and gas flow, so that the ultrasonic gas meter is adaptively calibrated by the calibration coefficient.
In the scheme, the target calibration coefficient value is finally obtained by gradually taking Chinese points, so that the calculation amount is small, and the calculation result is accurate.
The three-dimensional array of calibration coefficients is obtained by:
s10, respectively determining the ranges and the change step lengths of the temperature, the gas components and the flow;
s20, selecting two variables of temperature, gas components and flow to be fixed, namely, the two variables are used as static variables, the other variable is used as a dynamic variable, adjusting the dynamic variable according to the change step length, and obtaining and recording a calibration coefficient k under the current temperature, gas components and flow once adjustment;
and S30, changing variables needing dynamic change, and repeatedly executing the step S20 until all the variables are used as primary dynamic variables, thereby finally obtaining the three-dimensional array of the calibration coefficients.
The temperature range is-30 to +55 ℃, and the variation step length is 5 ℃.
The range of gas components is the range of methane mole percent concentration, and is 100% -80%, and the variation step length is 5%.
The flow range is 0.016m3/h~6m3H, step size of 0.08m3/h。
Compared with the prior art, the invention has the following beneficial effects: according to the calibration method, firstly, a three-dimensional array of calibration coefficients under the comprehensive influence of gas components, temperature and flow (flow rate) is established under experimental conditions, then, in the actual use process of the ultrasonic gas meter, the ultrasonic gas meter is subjected to self-adaptive calibration according to the temperature, the gas components and the flow of a field environment instead of taking the calibration value under a fixed environment as reference, so that more accurate measurement of the gas consumption can be realized, and the measurement accuracy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed 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 for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a flowchart of an adaptive calibration method for an ultrasonic gas meter provided in an embodiment.
Fig. 2a is a general flow chart of the construction of the three-dimensional array of calibration coefficients in the embodiment, and fig. 2b is a detailed flow chart of the construction of the three-dimensional array of calibration coefficients.
Fig. 3 is a schematic diagram of a time difference method gas meter.
Fig. 4 is a schematic diagram of 4 intermediate coordinate points calculated from 8 coordinate points in the three-dimensional coordinates of the calibration coefficient determined by the temperature t, the flow rate q, and the gas component x.
Fig. 5 is a schematic diagram of 2 intermediate coordinate points calculated from 4 coordinate points.
Fig. 6 is a schematic diagram of 1 intermediate coordinate point calculated from 2 coordinate points.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
As shown in fig. 1, the adaptive calibration method for an ultrasonic gas meter provided in this embodiment includes the following steps:
and S1, detecting the gas component x in the current environment.
The gas component herein refers to the specific mole fraction composition of the fuel gas, i.e., the methane mole percent concentration. In this step, gas component detection is performed by a chromatograph.
And S2, acquiring the temperature t of the current environment by using the temperature sensor.
In specific implementation, the temperature sensor can be independently arranged, and can also be integrated in the ultrasonic gas meter.
And S3, collecting the gas flow q under the current environment.
And S4, performing self-adaptive calibration on the ultrasonic gas meter according to the gas components, the temperature and the gas flow rate of the current environment and the pre-obtained three-dimensional array of the calibration coefficient.
In the practical use of the gas meter, the temperature t can be obtained according to the temperature sensor of the gas meter, the gas component x of the gas can be measured and obtained through the online chromatograph,and the flow q is transmitted to the gas meter in real time in a wireless communication mode of the gas meter, and the gas meter generally measures the flow q once every 2 seconds. According to the measured three real-time variable temperatures t, the gas components x and the flow q, k can be obtained by combining a three-dimensional array of calibration coefficients obtained in advance, and calibration is carried out by the calibration coefficients k. After calibration, according to the formula
The real-time flow Q of the gas can be obtained.
As shown in fig. 3, the basic principle of the time difference method ultrasonic gas meter is as follows:
in the formula:
l-vocal tract length in meters (m);
cf-the speed of sound waves propagating in a fluid, in meters per second (m/s);
The velocity of the fluid can be deduced from equations (1) and (2) as:
according to the average velocity of gas in the closed conduit
Cross sectional area of sound channel
In relation, the instantaneous flow Q can be obtained.
In the formula:
Wherein
The correction factors are influenced by many factors, such as the temperature (t) of the gaseous medium, the gaseous component (predominantly methane mole percent concentration,
) Flow rate (q means a flow rate constant portion), and the like.
The flow can be accurately calculated only by accurate calibration
。
In the gas temperature adaptability calibration device, three influencing variables, namely temperature t and gas composition
And in the flow q, two variables such as the temperature t and the gas composition are fixed each time, then the gas flow q is adjusted, the accurate gas flow Qz can be obtained from a standard instrument of the calibration device, and the calibration coefficient under the current temperature, the gas composition and the flow can be obtained according to the formula (4)
. The three-dimensional array of the calibration coefficient k under the three-dimensional coordinates (t, x, q) can be obtained by continuously repeating the calibration experiment.
Thus, as shown in FIG. 2a, a three-dimensional array of calibration coefficients is obtained by:
and S10, respectively determining the temperature, the gas composition, the range of the flow and the change step length.
In the embodiment, the temperature change is controlled by the temperature control box, so that the temperature change of-30 to +55 ℃ can be realized, namely the temperature range is-30 to +55 ℃, and the change step length is 5 ℃.
The control of gas components is realized by gas distribution, namely, the gas is accurately mixed and configured according to the gas component requirements, so that the mixed and configured gas components accurately meet the requirements. Adjusting the gas composition is adjusting the methane mole percent concentration
Hereinafter referred to as x), in the range of 100% to 80%, and the variation step length is 5%.
According to the formula (4), the adjustment of the flow q is the adjustment of the flow rate of the fuel gas, and the flow range is qmin（0.016m3/h）~qmax(6m3H) a step size of 5qminI.e. 5 times qmin（0.08m3/h）。
Naturally, different embodiments are possible for the range and the change step of each variable, for example, the change step may be set to be smaller to obtain a richer calibration coefficient matrix, and a more accurate calibration coefficient is obtained during actual calibration; the change step size can also be set larger to reduce the workload.
And S20, selecting two variables of the temperature, the gas composition and the flow to be fixed, namely, the two variables are used as static variables, the other variable is used as a dynamic variable, adjusting the dynamic variable according to the change step length, and obtaining and recording the calibration coefficient k under the current temperature, the gas composition and the flow once adjustment.
And S30, changing the dynamic variables, and repeatedly executing the step S20 until all the variables are used as the primary dynamic variables, thereby finally obtaining the three-dimensional array of the calibration coefficients.
With respect to steps S20 and S30, more specifically, as shown in FIG. 2b, for example, the temperature, gas composition as static variables are first kept constant, the flow rate as dynamic variables, and 0.08m3And h, regulating the flow, and recording a calibration coefficient k under the current temperature, gas components and flow once regulation until the regulation frequency reaches the maximum value, namely the flow after the last regulation is the maximum value of the flow range.
Then, the temperature and the flow are used as static variables and kept unchanged, the gas component is used as a dynamic variable, and a calibration coefficient k under the current temperature, the gas component and the flow is recorded every time the gas component is adjusted by 5 percent until the adjustment frequency reaches the maximum value, namely the gas component after the last adjustment is the maximum value of the range of the gas component.
And finally, taking the gas components and the flow as static variables, keeping the static variables unchanged, taking the temperature as a dynamic variable, and recording a calibration coefficient k under the current temperature, the gas components and the flow once adjustment until the adjustment frequency reaches the maximum, namely the temperature after the last adjustment is the maximum value of the temperature range.
As described above, since the variables are adjusted in a certain step when constructing the three-dimensional matrix of the calibration coefficients, the data in the three-dimensional matrix is discrete. In practical application, in step S4, if there is a coincidence of corresponding points in the three-dimensional array of the calibration coefficients of the gas components, temperature, and gas flow rate of the current environment, the k value of the calibration coefficient can be directly obtained, and then the k value is directly used for adaptive calibration; if the corresponding points are not overlapped, the k value of the calibration coefficient can not be directly obtained, and the k value of the calibration coefficient is determined in a close searching mode.
The search proximity method is to determine a calibration coefficient used as adaptive calibration from a plurality of calibration coefficient point k values closest to the three-dimensional coordinate point (t, x, q). As shown in fig. 4, the method specifically includes the following steps:
s41, searching for the calibration coefficient k values of eight points closest to the three-dimensional coordinate point (t, x, q) according to the obtained temperature t, gas component x and flow rate q at the current time, that is: k (t1, x1, q1), k (t1, x1, q2), k (t1, x2, q1), k (t1, x2, q2), k (t2, x1, q1), k (t2, x1, q2), k (t2, x2, q1), k (t2, x2, q2), where t1 ≦ t2, x1 ≦ x2, q1 ≦ q2, as shown in fig. 5.
S42, as shown in fig. 5, calculates the intermediate point 1 from the calibration coefficients k (t1, x1, q1) and k (t1, x1, q2) by the following formula:
k(t1,x1,q)=(q2-q)/(q2-q1)* k(t1,x1,q1)+ (q-q1)/(q2-q1)* k(t1,x1,q2)；
similarly, the intermediate point 2 is calculated from k (t1, x2, q1) and k (t1, x2, q2) by using the following formula:
k(t1,x2,q)=(q2-q)/(q2-q1)* k(t1,x2,q1)+ (q-q1)/(q2-q1)* k(t1,x2,q2)；
similarly, the intermediate point 3 is calculated from k (t2, x1, q1) and k (t1, x1, q2) by using the following formula:
k(t2,x1,q)=(q2-q)/(q2-q1)* k(t2,x1,q1)+ (q-q1)/(q2-q1)* k(t2,x1,q2)；
similarly, the intermediate point 4 is calculated from k (t2, x2, q1) and k (t2, x2, q2) by using the following formula:
k(t2,x2,q)=(q2-q)/(q2-q1)* k(t2,x2,q1)+ (q-q1)/(q2-q1)* k(t2,x2,q2)。
s43, as shown in fig. 6, calculates the intermediate point 5 from k (t1, x1, q) and k (t2, x1, q) by using the following formula:
k(t,x1,q)=(t2-t)/(t2-t1)* k(t1,x1,q)+ (t-t1)/(t2-t1)* k(t2,x1,q)；
similarly, the intermediate point 6 is calculated from k (t1, x2, q) and k (t2, x2, q) by using the following formula:
k(t,x2,q)=(t2-t)/(t2-t1)* k(t1,x2,q)+ (t-t1)/(t2-t1)* k(t2,x2,q)。
at S44, an intermediate point 7 is calculated from k (t, x1, q) and k (t, x2, q) by the following formula:
k (t, x, q) = (x2-x)/(x2-x1) × k (t, x1, q) + (x-x1)/(x2-x1) × k (t, x2, q), and the intermediate point 7 is a calibration coefficient corresponding to the current gas component, temperature and gas flow, so that the ultrasonic gas meter is adaptively calibrated by the calibration coefficient.
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 claims.
Claims (7)
1. An adaptive calibration method of an ultrasonic gas meter is characterized by comprising the following steps:
s1, detecting gas components in the current environment;
s2, collecting the temperature under the current environment;
s3, collecting the gas flow under the current environment;
and S4, performing self-adaptive calibration on the ultrasonic gas meter according to the gas components, the temperature and the gas flow of the current environment and the pre-obtained three-dimensional array of the calibration coefficients.
2. The adaptive calibration method for the ultrasonic gas meter according to claim 1, wherein in step S4, if the gas component x, the temperature t, and the gas flow q of the current environment coincide with corresponding points in the three-dimensional array of calibration coefficients, the calibration coefficient k value of the coincident points is directly used for adaptive calibration; and if no corresponding point is superposed, determining a calibration coefficient used as the self-adaptive calibration from a plurality of calibration coefficient point k values closest to the three-dimensional coordinate point (t, x, q).
3. The adaptive calibration method for an ultrasonic gas meter according to claim 2, wherein the step of determining a calibration coefficient used for adaptive calibration from a plurality of calibration coefficient point k values closest to the three-dimensional coordinate point (t, x, q) comprises:
s41, based on the three-dimensional array of calibration coefficients, according to the obtained temperature t, gas component x and flow q at the current moment, searching the calibration coefficient k values of eight points closest to the three-dimensional coordinate point (t, x, q), wherein the values are respectively as follows: k (t1, x1, q1), k (t1, x1, q2), k (t1, x2, q1), k (t1, x2, q2), k (t2, x1, q1), k (t2, x1, q2), k (t2, x2, q1), k (t2, x2, q2), where t1 ≦ t2, x1 ≦ x2, q1 ≦ q 2;
s42, calculating an intermediate point 1 from the calibration coefficients k (t1, x1, q1) and k (t1, x1, q2) by using the following formula:
k(t1,x1,q)=(q2-q)/(q2-q1)* k(t1,x1,q1)+ (q-q1)/(q2-q1)* k(t1,x1,q2)；
the intermediate point 2 is calculated from k (t1, x2, q1) and k (t1, x2, q2) by using the following equations:
k(t1,x2,q)=(q2-q)/(q2-q1)* k(t1,x2,q1)+ (q-q1)/(q2-q1)* k(t1,x2,q2)；
the intermediate point 3 is calculated from k (t2, x1, q1) and k (t1, x1, q2) by the following formula:
k(t2,x1,q)=(q2-q)/(q2-q1)* k(t2,x1,q1)+ (q-q1)/(q2-q1)* k(t2,x1,q2)；
the intermediate point 4 is calculated from k (t2, x2, q1) and k (t2, x2, q2) by using the following equations:
k(t2,x2,q)=(q2-q)/(q2-q1)* k(t2,x2,q1)+ (q-q1)/(q2-q1)* k(t2,x2,q2)；
at S43, the intermediate point 5 is calculated from k (t1, x1, q) and k (t2, x1, q) by the following formula:
k(t,x1,q)=(t2-t)/(t2-t1)* k(t1,x1,q)+ (t-t1)/(t2-t1)* k(t2,x1,q)；
the intermediate point 6 is calculated from k (t1, x2, q), k (t2, x2, q) using the following formula:
k(t,x2,q)=(t2-t)/(t2-t1)* k(t1,x2,q)+ (t-t1)/(t2-t1)* k(t2,x2,q)；
at S44, an intermediate point 7 is calculated from k (t, x1, q) and k (t, x2, q) by the following formula:
k (t, x, q) = (x2-x)/(x2-x1) × k (t, x1, q) + (x-x1)/(x2-x1) × k (t, x2, q), and the intermediate point 7 is a calibration coefficient corresponding to the current gas component, temperature and gas flow, so that the ultrasonic gas meter is adaptively calibrated by the calibration coefficient.
4. The adaptive calibration method for the ultrasonic gas meter according to claim 1, wherein the three-dimensional array of calibration coefficients is obtained by:
s10, respectively determining the ranges and the change step lengths of the temperature, the gas components and the flow;
s20, selecting two variables of temperature, gas components and flow to be fixed, namely, the two variables are used as static variables, the other variable is used as a dynamic variable, adjusting the dynamic variable according to the change step length, and obtaining and recording a calibration coefficient k under the current temperature, gas components and flow once adjustment;
and S30, changing the dynamic variables, and repeatedly executing the step S20 until all the variables are used as the primary dynamic variables, thereby finally obtaining the three-dimensional array of the calibration coefficients.
5. The adaptive calibration method of the ultrasonic gas meter according to claim 4, wherein the temperature range is-30 to +55 ℃, and the variation step is 5 ℃.
6. The self-adaptive calibration method of the ultrasonic gas meter according to claim 4, wherein the gas component range is a methane mole percentage concentration range of 100% to 80%, and the variation step length is 5%.
7. The adaptive calibration method for the ultrasonic gas meter according to claim 4, wherein the flow range is 0.016m3/h~6m3H, step size of 0.08m3/h。
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