CN218955825U - Matrix flowmeter with automatic calibration function - Google Patents
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- CN218955825U CN218955825U CN202223189881.5U CN202223189881U CN218955825U CN 218955825 U CN218955825 U CN 218955825U CN 202223189881 U CN202223189881 U CN 202223189881U CN 218955825 U CN218955825 U CN 218955825U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a matrix flowmeter with an automatic calibration function, which comprises a matrix flowmeter body, a pitot tube, an average full-pressure guiding pipe, an average static pressure guiding pipe, a first differential pressure transmitter, a full-pressure comparison pressure guiding pipe, a full-pressure comparison on-off valve, a static pressure comparison pressure guiding pipe, a static pressure comparison on-off valve, a second differential pressure transmitter, a branch full-pressure pipe, a branch full-pressure on-off valve, a branch static pressure pipe and a branch static pressure on-off valve; the pitot tube is arranged on the upper or downstream of the matrix flowmeter body according to a standard grid method; the matrix flowmeter body is connected to the first differential pressure transmitter through an average full-pressure guiding pipe and an average static pressure guiding pipe; the second differential pressure transmitter is connected with the average full-pressure guiding pipe and the average static pressure guiding pipe through the full-pressure comparison pressure guiding pipe and the static pressure comparison pressure guiding pipe; the pitot tube is connected with a second differential pressure transmitter through a branch full-pressure guiding pipe and a branch static pressure guiding pipe; each on-off valve is arranged on the corresponding pipeline. The utility model realizes high-precision and real-time measurement under different working conditions.
Description
Technical Field
The utility model relates to a matrix flowmeter with an automatic calibration function, and belongs to the field of gas flow monitoring.
Background
In modern enterprise production, the boiler needs to send a large amount of wind every hour, and a large amount of flue gas is produced. Cost accounting and management are implemented, energy consumption is reduced sufficiently, and measurement of dust-containing gas flow of large pipelines is increasingly important, and is also being focused and paid attention to.
In the industrial production process, in the measurement of four thermal parameters of temperature, pressure, flow and liquid level, an automatic control engineer generally considers that the flow measurement needs to reach the maximum difficulty of the expected accuracy and reliability, and especially the measurement of the air quantity and the flue gas flow of a large pipeline is more troublesome, and the reason is that: the measured fluid has the characteristics of high temperature, high dust content, strong corrosiveness and the like; and secondly, the pipeline for conveying the fluid has large sectional area, short straight pipe section, more elbows, uneven flow field, large flow change range, small static pressure and low flow velocity. Therefore, to accurately measure the air quantity and the flue gas flow of the large pipeline, the flow meter is reasonably designed and selected, and is correctly installed and used, and the accuracy and the reliability of the measured value can be ensured only through omnibearing control.
The matrix flowmeter is developed for measuring the gas flow of a non-uniform flow field, and the core technical idea is to arrange and collect a plurality of sensing pressure measuring points on a large cross section, so as to realize multi-point pressure equalization (the differential pressure transmitter is connected later) and improve the measurement accuracy. The conventional matrix flowmeter is a real-time meter, the measurement delay time is negligible, the instantaneous flow fluctuation can be measured in real time on line, on the premise that the flow field distribution rule is basically unchanged, the gas flow can be accurately measured after being calibrated by adopting a fixed flow coefficient, but once the flow field distribution rule changes, the kinetic energy of gas flow cannot be completely converted into potential energy due to the existence of channeling among a plurality of sensing points, namely, the acquired differential pressure signal after pressure equalization is distorted, the flow coefficient is unstable, and the gas flow cannot be accurately measured.
Disclosure of Invention
In order to solve the technical problems, the utility model provides a matrix flowmeter with an automatic calibration function, which realizes high-precision measurement under different working conditions and realizes real-time continuous output of gas flow.
In order to solve the technical problems, the technical scheme adopted by the utility model is as follows:
a matrix flowmeter with an automatic calibration function comprises a matrix flowmeter body, a pitot tube, an average full-pressure leading pipe, an average static pressure leading pipe, a first differential pressure transmitter, a full-pressure comparison leading pipe, a full-pressure comparison on-off valve, a static pressure comparison leading pipe, a static pressure comparison on-off valve, a second differential pressure transmitter, a branch full-pressure pipe, a branch full-pressure on-off valve, a branch static pressure pipe and a branch static pressure on-off valve;
the number N of the pitot tubes is more than or equal to 4, and the N pitot tubes are arranged at the upstream or downstream of the matrix flowmeter body according to a standard grid method;
an average full-pressure leading port and an average static pressure leading port are arranged on the matrix flowmeter body, one end of an average full-pressure leading pipe is connected with the average full-pressure leading port, the other end of the average full-pressure leading pipe is connected to the positive pressure end of the first differential pressure transmitter, one end of the average static pressure leading pipe is connected with the average static pressure leading port, and the other end of the average static pressure leading pipe is connected to the negative pressure end of the first differential pressure transmitter;
one end of the full-pressure comparison pressure guiding pipe is connected with any position on the average full-pressure guiding pipe, the other end of the full-pressure comparison pressure guiding pipe is connected to the positive pressure end of the second differential pressure transmitter, and the full-pressure comparison on-off valve is arranged on the full-pressure comparison pressure guiding pipe; one end of the static pressure comparison pressure guiding pipe is connected with any position on the average static pressure guiding pipe, and the other end of the static pressure comparison pressure guiding pipe is connected to the negative pressure end of the second differential pressure transmitter;
the number of the branch full-pressure leading pipes is equal to that of the pitot tubes, the full-pressure connectors of the pitot tubes are in one-to-one correspondence, the full-pressure connectors of the pitot tubes are connected to the positive pressure end of the second differential pressure transmitter through corresponding branch full-pressure connectors, and branch full-pressure on-off valves are arranged on the branch full-pressure connectors; the number of the branch static pressure guiding pipes is equal to that of the pitot tubes, the static pressure joints of the pitot tubes are in one-to-one correspondence, the static pressure joints of the pitot tubes are connected to the positive pressure end of the second differential pressure transmitter through corresponding branch static pressure pipes, and branch static pressure on-off valves are arranged on the branch static pressure pipes.
The pitot tubes arranged by the standard grid method can realize accurate measurement of large-section gas flow, and by combining with the design of a specific connection structure, accurate correction of matrix flowmeter measurement under different working conditions is realized, so that not only is no hysteresis of flow measurement ensured, but also the accuracy of measurement under different working conditions is ensured.
In order to facilitate zero calibration of the differential pressure transmitter, the matrix flowmeter with the automatic calibration function preferably further comprises an average full-pressure on-off valve, an average static pressure on-off valve, a balance communicating pipe and a balance communicating valve; the average full-pressure on-off valve is arranged on the average full-pressure leading pipe, and the average static pressure on-off valve is arranged on the average static pressure leading pipe; one end of the balance communicating pipe is connected with an average full-pressure leading pipe between the average full-pressure on-off valve and the first differential pressure transmitter, and the other end is connected with an average static pressure leading pipe between the average static pressure on-off valve and the first differential pressure transmitter; the balance communicating valve is arranged on the balance communicating pipe.
The average full-pressure on-off valve, the average static pressure on-off valve, the branch full-pressure on-off valve and the branch static pressure on-off valve are all closed, and the balance communication valve, the full-pressure comparison on-off valve and the static pressure comparison on-off valve are all opened, so that the zero calibration function of the first differential pressure transmitter and the second differential pressure transmitter is realized.
It should be noted that: when in a measuring state, the average full-pressure on-off valve and the average static-pressure on-off valve are in an open state, and the balance communication valve is in a related state.
The circuits of the full-pressure comparison on-off valve, the static pressure comparison on-off valve, the branch full-pressure on-off valve, the branch static pressure on-off valve, the first differential pressure transmitter, the second differential pressure transmitter, the average full-pressure on-off valve, the average static pressure on-off valve and the balance communicating valve are all connected to an automatic calibration control platform. It should be noted that: the automatic calibration control platform adopts the existing equipment, and the control of the on-off valve adopts the existing mature technology, so the application has no improvement on the control platform, and therefore, the control platform is not repeated.
The full-pressure comparison on-off valve and the static-pressure comparison on-off valve form a group of comparison on-off valves, the branch full-pressure on-off valve and the branch static-pressure on-off valve corresponding to the same pitot tube form a group of branch on-off valves, and the N pitot tubes correspond to N groups of branch on-off valves;
in the group of comparison on-off valves and the N groups of branch on-off valves, at most, only one group of on-off valves (the comparison on-off valves or the branch on-off valves) is kept open, the rest of the on-off valves are closed, one group of on-off valves is opened in a round trip, and the opening time of each group of on-off valves is T;
when the N groups of branch on-off valve rounds are opened, the flow velocity distribution and the average flow velocity of the whole measurement section are obtained, then an accurate flow value is obtained, the ratio K of the flow velocity or the flow average value measured by the N pitot tubes in the period to the flow velocity or the flow average value measured by the matrix flowmeter in the NT period is taken as the on-line calibration coefficient of the matrix flowmeter, and the output value of the matrix flowmeter is corrected to be the calculated value after the current measured value is multiplied by K.
When the measured value of the matrix flowmeter is smaller than +/-3% in the NT period of opening of the N groups of branch on-off valve rounds, updating the K value, otherwise (the fluctuation amplitude is not smaller than +/-3%) is not updated.
And when the on-off valve opening period is compared, the average deviation of the output values of the first differential pressure transmitter and the second differential pressure transmitter exceeds +/-1%, and the automatic calibration management and control platform sends an alarm prompt that the differential pressure transmitter needs to be calibrated. The specific setting method of the alarm prompt is realized by adopting the prior mature technology.
The opening time T of each group of on-off valves is preferably between 5 and 30 seconds.
The device has a sectional calibration function within the flow velocity range of 0-50m/s, and the length of each section is 2-5 m/s.
The method is particularly suitable for measuring unstable working conditions, and is real-time and accurate.
The technology not mentioned in the present utility model refers to the prior art.
The matrix flowmeter with the automatic calibration function combines the design of the pitot tubes and the specific connection structure which are arranged in a standard grid method, realizes the accurate correction of the measurement of the matrix flowmeter under different working conditions, realizes the high-precision measurement under different working conditions, and simultaneously ensures the real-time continuous output of the gas flow; further, the online zeroing of the differential pressure transmitter is realized.
Drawings
FIG. 1 is a schematic layout diagram of a matrix flowmeter with automatic calibration function according to embodiment 1 of the present utility model;
FIG. 2 is a schematic layout diagram of a matrix flowmeter with automatic calibration function according to embodiment 2 of the present utility model;
FIG. 3 is a graph showing the comparison of the measured output values of the matrix flowmeter with automatic calibration function in example 1 of the present utility model with the conventional matrix flowmeter without calibration function and the standard grid method flowmeter;
in the figure, 1 is a matrix flowmeter body, 2 is a pitot tube, 3 is an average full-pressure leading pipe, 4 is an average static pressure leading pipe, 5 is a full-pressure comparison leading pipe, 6 is a static pressure comparison leading pipe, 7 is a full-pressure comparison on-off valve, 8 is a static pressure comparison on-off valve, 9 is a branch full-pressure pipe, 10 is a branch static pressure pipe, 11 is a branch full-pressure on-off valve, 12 is a branch static pressure on-off valve, 13 is a first differential pressure transmitter, 14 is a second differential pressure transmitter, 15 is an average full-pressure on-off valve, 16 is an average static pressure on-off valve, 17 is a balance communicating pipe, and 18 is a balance communicating valve; qa is the output value of the matrix flowmeter with the automatic calibration function, qb is the output value of the matrix flowmeter without the conventional calibration function, and Qc is the output value of the standard grid method flowmeter.
Detailed Description
For a better understanding of the present utility model, the following examples are further illustrated, but are not limited to the following examples.
Example 1
As shown in FIG. 1, the matrix flowmeter with the automatic calibration function comprises a matrix flowmeter body, a pitot tube, an average full-pressure leading pipe, an average static pressure leading pipe, a first differential pressure transmitter, a full-pressure comparison pressure leading pipe, a full-pressure comparison on-off valve, a static pressure comparison pressure leading pipe, a static pressure comparison on-off valve, a second differential pressure transmitter, a branch full-pressure pipe, a branch full-pressure on-off valve, a branch static pressure pipe and a branch static pressure on-off valve;
the number N of the pitot tubes is more than or equal to 4, and the N pitot tubes are arranged at the upstream or downstream of the matrix flowmeter body according to a standard grid method;
an average full-pressure leading port and an average static pressure leading port are arranged on the matrix flowmeter body, one end of an average full-pressure leading pipe is connected with the average full-pressure leading port of the matrix flowmeter body, the other end of the average full-pressure leading pipe is connected to the positive pressure end of the first differential pressure transmitter, one end of the average static pressure leading pipe is connected with the average static pressure leading port of the matrix flowmeter body, and the other end of the average full-pressure leading pipe is connected to the negative pressure end of the first differential pressure transmitter;
one end of the full-pressure comparison pressure guiding pipe is connected with any position on the average full-pressure guiding pipe, the other end of the full-pressure comparison pressure guiding pipe is connected to the positive pressure end of the second differential pressure transmitter, and the full-pressure comparison on-off valve is arranged on the full-pressure comparison pressure guiding pipe; one end of the static pressure comparison pressure guiding pipe is connected with any position on the average static pressure guiding pipe, and the other end of the static pressure comparison pressure guiding pipe is connected to the negative pressure end of the second differential pressure transmitter;
the number of the branch full-pressure leading pipes is equal to that of the pitot tubes, the full-pressure connectors of the pitot tubes are in one-to-one correspondence, the full-pressure connectors of the pitot tubes are connected to the positive pressure end of the second differential pressure transmitter through corresponding branch full-pressure connectors, and branch full-pressure on-off valves are arranged on the branch full-pressure connectors; the number of the branch static pressure guiding pipes is equal to that of the pitot tubes, the static pressure joints of the pitot tubes are in one-to-one correspondence, the static pressure joints of the pitot tubes are connected to the positive pressure end of the second differential pressure transmitter through corresponding branch static pressure pipes, and branch static pressure on-off valves are arranged on the branch static pressure pipes.
The full-pressure comparison on-off valve and the static pressure comparison on-off valve form a group of comparison on-off valves, the branch full-pressure on-off valve and the branch static pressure on-off valve corresponding to the same pitot tube form a group of branch on-off valves, and the N pitot tubes correspond to the N groups of branch on-off valves; in the group of comparison on-off valves and the N groups of branch on-off valves, at most, only one group of on-off valves (the comparison on-off valves or the branch on-off valves) is kept open, the rest of the on-off valves are closed, one group of on-off valves is opened in a round trip, and the opening time of each group of on-off valves is T (5-30 s);
when the N groups of branch on-off valve rounds are opened, the flow velocity distribution and the average flow velocity of the whole measurement section are obtained, then an accurate flow value is obtained, the ratio K of the flow velocity or the flow average value measured by the N pitot tubes in the period to the flow velocity or the flow average value measured by the matrix flowmeter in the NT period is obtained (when the measured value of the matrix flowmeter in the NT period is smaller than +/-3%, the K value is updated according to the method, otherwise, the K value is not updated), the on-line calibration coefficient of the matrix flowmeter is obtained, and the output value of the matrix flowmeter is corrected to be the calculated value obtained by multiplying the current measured value by K.
In order to compare the measurement characteristics of the matrix flowmeter with the automatic calibration function (including the standard grid method flowmeter) with the conventional matrix flowmeter without the calibration function, respectively storing and outputting measurement curves of the matrix flowmeter with the automatic calibration function, the conventional matrix flowmeter without the calibration function and the standard grid method flowmeter, wherein the measurement curves of a flue straight pipe section after desulfurization and before a chimney of a 600 MW-level coal-fired generator set are used, N is 36, T is 8, and the result is shown in fig. 3, and as can be seen from fig. 3, the measurement of the matrix flowmeter with the automatic calibration function is basically consistent with the measurement of the standard grid method flowmeter, only phase difference exists, namely the standard grid method flowmeter is delayed for a period of time, in addition, the measurement curve of the standard grid method flowmeter is smoother, the self-filtering effect is achieved, and the peak value of the measurement value is smaller or the trough value is larger under the severe variable working condition; under the condition that the measurement output value of the matrix flowmeter is not calibrated, the measurement curve of the matrix flowmeter is poor in fit with the measurement curve of the standard grid method flowmeter, and the measurement is inaccurate.
Example 2
As shown in fig. 2, the following modifications were further made on the basis of example 1: in order to facilitate zero calibration of the differential pressure transmitter, the matrix flowmeter with the automatic calibration function further comprises an average full-pressure on-off valve, an average static pressure on-off valve, a balance communicating pipe and a balance communicating valve; the average full-pressure on-off valve is arranged on the average full-pressure leading pipe, and the average static pressure on-off valve is arranged on the average static pressure leading pipe; one end of the balance communicating pipe is connected with an average full-pressure guiding pipe between the average full-pressure on-off valve and the first differential pressure transmitter, and the other end of the balance communicating pipe is connected with an average static pressure guiding pipe between the average static pressure on-off valve and the first differential pressure transmitter; the balance communicating valve is arranged on the balance communicating pipe. The average full-pressure on-off valve, the average static pressure on-off valve, the branch full-pressure on-off valve and the branch static pressure on-off valve are all closed, and the balance communication valve, the full-pressure comparison on-off valve and the static pressure comparison on-off valve are all opened, so that the zero calibration function of the first differential pressure transmitter and the second differential pressure transmitter is realized.
When in a measuring state, the average full-pressure on-off valve and the average static-pressure on-off valve are in an open state, and the balance communication valve is in a related state. The specific modification method is the same as in example 1.
The circuits of the full-pressure comparison on-off valve, the static pressure comparison on-off valve, the branch full-pressure on-off valve, the branch static pressure on-off valve, the first differential pressure transmitter, the second differential pressure transmitter, the average full-pressure on-off valve, the average static pressure on-off valve and the balance communicating valve are all connected to the automatic calibration control platform. And when the on-off valve opening period is compared, the average deviation of the output values of the first differential pressure transmitter and the second differential pressure transmitter exceeds +/-1%, and the automatic calibration management and control platform sends an alarm prompt that the differential pressure transmitter needs to be calibrated.
The device has a sectional calibration function within the flow velocity range of 0-50m/s, and the length of each section is 2-5 m/s.
The matrix flowmeter with the automatic calibration function in each example combines the design of the pitot tubes and the specific connection structure which are arranged in a standard grid method, realizes the accurate correction of the measurement of the matrix flowmeter under different working conditions, realizes the high-precision measurement under different working conditions, and simultaneously ensures the real-time continuous output of the gas flow.
Claims (6)
1. A matrix flowmeter with automatic calibration function, which is characterized in that: the device comprises a matrix flowmeter body (1), a pitot tube (2), an average full-pressure guiding pipe (3), an average static pressure guiding pipe (4), a first differential pressure transmitter (13), a full-pressure comparison pressure guiding pipe (5), a full-pressure comparison on-off valve (7), a static pressure comparison pressure guiding pipe (6), a static pressure comparison on-off valve (8), a second differential pressure transmitter (14), a branch full-pressure pipe (9), a branch full-pressure on-off valve (11), a branch static pressure pipe (10) and a branch static pressure on-off valve (12);
the number N of the pitot tubes (2) is more than or equal to 4, and the N pitot tubes (2) are arranged at the upstream or downstream of the matrix flowmeter body (1) according to a standard grid method;
an average full-pressure leading port and an average static pressure leading port are arranged on the matrix flowmeter body (1), one end of an average full-pressure leading pipe (3) is connected with the average full-pressure leading port, the other end of the average full-pressure leading pipe is connected to the positive pressure end of the first differential pressure transmitter (13), one end of an average static pressure leading pipe (4) is connected with the average static pressure leading port, and the other end of the average static pressure leading pipe is connected to the negative pressure end of the first differential pressure transmitter (13);
one end of the full-pressure comparison pressure guiding pipe (5) is connected with the average full-pressure guiding pipe (3), the other end of the full-pressure comparison pressure guiding pipe is connected to the positive pressure end of the second differential pressure transmitter (14), and the full-pressure comparison on-off valve (7) is arranged on the full-pressure comparison pressure guiding pipe (5); one end of the static pressure comparison pressure guiding pipe (6) is connected with the average static pressure guiding pipe (4), the other end of the static pressure comparison pressure guiding pipe is connected to the negative pressure end of the second differential pressure transmitter (14), and the static pressure comparison on-off valve (8) is arranged on the static pressure comparison pressure guiding pipe (6);
the number of the branch full-pressure leading pipes is equal to that of the pitot tubes (2) and corresponds to that of the pitot tubes (2) one by one, the full-pressure joints of each pitot tube (2) are respectively connected to the positive pressure end of the second differential pressure transmitter (14) through the corresponding branch full-pressure pipes (9), and branch full-pressure on-off valves (11) are arranged on each branch full-pressure pipe (9); the number of the branch static pressure leading pipes is equal to that of the pitot tubes (2), the static pressure connectors of the pitot tubes (2) are in one-to-one correspondence, the static pressure connectors of the pitot tubes (2) are respectively connected to the positive pressure end of the second differential pressure transmitter (14) through the corresponding branch static pressure pipes (10), and branch static pressure on-off valves (12) are arranged on the branch static pressure pipes (10).
2. The matrix flowmeter with automatic calibration function of claim 1, wherein: the device also comprises an average full-pressure on-off valve (15), an average static pressure on-off valve (16), a balance communicating pipe (17) and a balance communicating valve (18); the average full-pressure on-off valve (15) is arranged on the average full-pressure leading pipe (3), and the average static pressure on-off valve (16) is arranged on the average static pressure leading pipe (4); one end of the balance communicating pipe (17) is connected with an average full-pressure guiding pipe (3) between the average full-pressure on-off valve (15) and the first differential pressure transmitter (13), and the other end is connected with an average static pressure guiding pipe (4) between the average static pressure on-off valve (16) and the first differential pressure transmitter (13); the balance communicating valve (18) is arranged on the balance communicating pipe (17).
3. The matrix flowmeter with automatic calibration function of claim 2, wherein: the circuits of the full-pressure comparison on-off valve (7), the static pressure comparison on-off valve (8), the branch full-pressure on-off valve (11), the branch static pressure on-off valve (12), the first differential pressure transmitter (13), the second differential pressure transmitter (14), the average full-pressure on-off valve (15), the average static pressure on-off valve (16) and the balance communication valve (18) are all connected to an automatic calibration control platform.
4. A matrix flowmeter with automatic calibration function according to claim 2 or 3, wherein: the average full-pressure on-off valve (15), the average static pressure on-off valve (16), the branch full-pressure on-off valve (11) and the branch static pressure on-off valve (12) are all closed, the balance communication valve (18), the full-pressure comparison on-off valve and the static pressure comparison on-off valve (8) are all opened, and the zero calibration function of the first differential pressure transmitter (13) and the second differential pressure transmitter (14) is realized.
5. A matrix flowmeter with automatic calibration function according to any one of claims 1-3, wherein: a full-pressure comparison on-off valve and a static pressure comparison on-off valve (8) form a group of comparison on-off valves, a branch full-pressure on-off valve (11) and a branch static pressure on-off valve (12) corresponding to the same pitot tube (2) form a group of branch on-off valves, and N pitot tubes (2) correspond to N groups of branch on-off valves; in the group of comparison on-off valves and the N groups of branch on-off valves, at most, one group of on-off valves is kept to be opened, the rest of the on-off valves are closed, one group of on-off valves is opened in a round trip, and the opening time of each group of on-off valves is T.
6. The matrix flowmeter with automatic calibration function of claim 5, wherein: t is between 5 and 30 s.
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