CN107255501B - Gas-liquid mixed flow type vortex shedding flowmeter calibration detection device system and control method - Google Patents
Gas-liquid mixed flow type vortex shedding flowmeter calibration detection device system and control method Download PDFInfo
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- CN107255501B CN107255501B CN201710418725.6A CN201710418725A CN107255501B CN 107255501 B CN107255501 B CN 107255501B CN 201710418725 A CN201710418725 A CN 201710418725A CN 107255501 B CN107255501 B CN 107255501B
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- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/10—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of flowmeters
Abstract
The invention provides a gas-liquid mixed flow type vortex shedding flowmeter calibration detection device system and a control method, wherein the system comprises a calibration solution output unit, a gas injection unit, a calibration pipeline, a flow control unit, a standard metering tank and a calibration detection unit; the calibration detection device system and the control method of the gas-liquid mixed flow type vortex shedding flowmeter not only can output the same engineering parameters as the permanent magnet type vortex shedding flowmeter, but also can output the parameters of the flow rate of the bubble content in the gas-liquid mixed conductive measured medium solution, the total amount of the bubbles and the like, thereby not only meeting the calibration of the permanent magnet type vortex shedding flowmeter product, but also meeting the calibration of the gas-liquid mixed flow type vortex shedding flowmeter product; the invention can be widely applied to the fields of petrochemical industry, urban water supply pipelines and the like, can effectively detect whether the pipelines have leakage, and has the characteristics of high calibration detection precision and wide application range.
Description
Technical Field
The invention relates to the field of flowmeter calibration, in particular to a gas-liquid mixed flow type vortex shedding flowmeter calibration detection device system and a control method.
Background
The Vortex Street flowmeter is manufactured by applying a karman Vortex Street principle and modern electronic technology design, is researched and produced according to the karman Vortex Street principle (K < rm < n Vortex Street), and is mainly used for measuring the flow of industrial pipeline medium fluid, such as various media of gas, liquid, steam and the like. The vortex shedding flowmeter is mainly divided into a thermal sensitive type, an ultrasonic type, a capacitance type, a stress type, a strain type, a vibration type, a photoelectric type, an optical fiber type and an electromagnetic type according to a detection method, wherein the permanent magnet type vortex shedding flowmeter is mainly applied to the fields of petrochemical industry, metallurgical machinery, food, papermaking, urban heat supply, water supply and the like. However, the existing calibration method and calculation output of the permanent magnet vortex shedding flowmeter are single, and only the flow velocity of the conductive measured medium solution related to the signal vortex frequency is output, so that engineering parameters such as volume flow, volume total amount and the like related to the flow velocity of the conductive measured medium solution are obtained and calculated and output, but the permanent magnet vortex shedding flowmeter cannot output parameters such as the flow velocity of the gas-liquid mixed conductive measured medium solution, the gas bubble total amount and the like.
The working principle of the gas-liquid mixed flow type vortex shedding flow is basically the same as that of a permanent magnet type vortex shedding flowmeter, the gas-liquid mixed flow type vortex shedding flowmeter can be used in the field of application of the permanent magnet type vortex shedding flowmeter, and besides the gas-liquid mixed flow type vortex shedding flowmeter can output the same engineering parameters as that of the permanent magnet type vortex shedding flowmeter, the gas-liquid mixed flow type vortex shedding flowmeter can also output the parameters of the gas-liquid mixed type conductivity measured medium solution, such as the flow rate of the bubble content, the bubble total amount and the like, so that the gas-liquid mixed flow type vortex shedding flowmeter can be applied to some special occasions which are widely applied in petrochemical industry and urban water supply pipelines, but the existing calibration device can not provide the gas-liquid mixed type conductivity measured medium solution and can not meet the calibration requirement of the gas-liquid mixed flow type vortex shedding flowmeter product, therefore, a new device system and a control method are, to solve the above technical problems.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention provides a calibration and detection device system and a control method for a gas-liquid mixed flow vortex shedding flowmeter, so as to solve the above-mentioned technical problems.
The invention provides a gas-liquid mixed flow type vortex shedding flowmeter calibration and detection device system, which comprises:
a calibration solution output unit for outputting a calibration solution;
the gas injection unit is used for injecting gas into the output calibration solution;
the calibration pipeline is used for enabling the output calibration solution to sequentially pass through the gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
the flow control unit is used for controlling the gas flow and calibrating the solution flow;
the standard metering barrel is used for standard metering of production calibration and detection of the gas-liquid mixed flow type vortex shedding flowmeter;
and the calibration detection unit is used for calculating a calibration output coefficient and calculating the precision of the gas volume flow.
The device further comprises a flow integrating instrument used for controlling and outputting stable constant flow gas flow to a calibration solution, wherein the calibration solution is a conductive measured medium solution;
the accuracy of the gas volume flow is calculated by the following formula:
FS％＝fabs(Va-Va1)/Va×100％
wherein FS is the accuracy of the gas volume flow, Va1To be transportedAnd the volume flow of the discharged gas, Va is the volume flow index of the gas output by the flow integrating instrument.
Further, the calibration output coefficient is calculated by the following formula:
Kp＝Kp1Va/Va1
wherein, KpTo calibrate the output coefficient, Kp1The converter is preset coefficient before the gas-liquid mixed vortex shedding flowmeter is calibrated.
Further, the flow control unit controls a calibration solution to fill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed mode, and the signal frequency is sequentially subjected to sectional numerical interception to be respectively used as a calibration point of the flow;
the flow control unit adjusts the flow of the calibration solution to meet the frequency value of the calibration point;
the calibration detection unit clears the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter and discharges a calibration solution;
the flow control unit controls the calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and the calibration detection unit records the total volume reading of the gas-liquid mixed vortex shedding flowmeter to be calibrated and the reading of the standard metering barrel;
and repeating the steps until the calibration of all the calibration points is completed.
Further, the flow control unit controls a calibration solution to fill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed mode, and the signal frequency is sequentially subjected to sectional numerical interception and is respectively used as a flow detection point;
adjusting the flow of the conductive medium solution to be detected to meet the frequency value of the detection point;
the calibration detection unit clears the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter and discharges a calibration solution;
the flow control unit controls the calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and the calibration detection unit records the total volume readings of all the gas-liquid mixed vortex shedding flowmeters and the readings of the standard metering barrel;
repeating the steps until the calibration detection of all the detection points is completed;
the calibration detection unit sequentially carries out sectional numerical interception according to the same signal frequency as the detection point and serves as a gas content detection flow point under the constant current of the conductive detected medium solution;
the calibration detection unit selects gas injection quantity points with different values and injects the gas injection quantity points into the conductive medium solution to be detected respectively;
adjusting the flow of the conductive measured medium solution to meet the frequency value of the detection point, controlling the flow control unit to output the gas injection quantity with the same value as the selected gas injection quantity point, calibrating the detection unit to record the current gas injection quantity value in a delayed manner, and calibrating the bubble content in the conductive measured medium solution output by each gas-liquid mixed vortex shedding flowmeter;
and repeating the steps until the gas content in the conductive measured medium solution of all the gas injection quantity points is detected, and the gas content in the conductive measured medium solution of all the gas injection quantity points under all the frequency points is detected, so that the detection of the gas bubble content is completed.
The invention also provides a calibration detection control method of the gas-liquid mixed flow type vortex shedding flowmeter, which comprises the following steps:
extracting and outputting a calibration solution;
injecting gas into the output calibration solution, and enabling the output calibration solution to sequentially pass through a gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
controlling the gas flow and the calibration solution flow;
and calculating the precision of a calibration output coefficient and the gas volume flow according to the gas flow, the calibration solution flow and the readings of the standard metering barrel, and completing the calibration and measurement of the gas-liquid mixed flow type vortex shedding flowmeter to be calibrated.
Further, controlling the flow of the gas with stable constant flow output to a calibration solution, wherein the calibration solution is a conductive measured medium solution;
the accuracy of the gas volume flow is calculated by the following formula:
FS％＝fabs(Va-Va1)/Va×100％
wherein FS is the accuracy of the gas volume flow, Va1For outputting a volumetric flow of gas, VaAnd the volume flow rate display of the gas output by the flow integrating instrument control.
Further, the calibration output coefficient is calculated by the following formula:
Kp＝Kp1Va/Va1
wherein, KpTo calibrate the output coefficient, Kp1The converter is preset coefficient before the gas-liquid mixed vortex shedding flowmeter is calibrated.
Further, controlling a calibration solution to fill a calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, recording the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed manner, and sequentially carrying out sectional numerical interception on the signal frequency to respectively serve as a calibration point of the flow;
adjusting the flow of the calibration solution through a flow control unit to meet the frequency value of the calibration point;
clearing the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter to zero, and discharging a calibration solution;
controlling a calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and recording the total volume reading of the gas-liquid mixed vortex shedding flowmeter to be calibrated and the reading of a standard metering barrel;
and repeating the steps until the calibration of all the calibration points is completed.
Further, controlling a calibration solution to fill a calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, recording the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed manner, and sequentially carrying out sectional numerical interception on the signal frequency to be respectively used as flow detection points;
adjusting the flow of the calibration solution through a flow control unit to meet the frequency value of the detection point;
clearing the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter to zero, and discharging a calibration solution;
controlling a calibration solution to refill a calibration pipeline and a gas-liquid mixed vortex shedding flowmeter to be calibrated, and recording the total volume readings of all the gas-liquid mixed vortex shedding flowmeters and the readings of a standard metering barrel;
repeating the steps until the calibration detection of all the detection points is completed;
sequentially carrying out sectional numerical interception according to the same signal frequency as the detection point, and taking the sectional numerical interception as a gas content detection flow point under the constant current of the conductive detected medium solution;
selecting gas injection points with different numerical values, and injecting the gas injection points into the conductive medium solution to be detected respectively;
the flow of the conductive measured medium solution is adjusted through the flow control unit to meet the frequency value of the detected point, the gas injection quantity with the same value as the selected gas injection quantity point is controlled and output, the current gas injection quantity value is recorded in a delayed mode, and the bubble content in the conductive measured medium solution output by each gas-liquid mixed vortex shedding flowmeter is obtained;
and repeating the steps until the gas content in the conductive measured medium solution of all the gas injection quantity points is detected, and the gas content in the conductive measured medium solution of all the gas injection quantity points under all the frequency points is detected, so that the detection of the gas bubble content is completed.
The invention has the beneficial effects that: the calibration detection device system and the control method of the gas-liquid mixed flow type vortex shedding flowmeter not only can output the same engineering parameters as the permanent magnet type vortex shedding flowmeter, but also can output the parameters of the flow rate of the bubble content in the gas-liquid mixed conductive measured medium solution, the total amount of the bubbles and the like, thereby not only meeting the calibration of the permanent magnet type vortex shedding flowmeter product, but also meeting the calibration of the gas-liquid mixed flow type vortex shedding flowmeter product; the invention can be widely applied to the fields of petrochemical industry, urban water supply pipelines and the like, can effectively detect whether the pipelines have leakage, and has the characteristics of high calibration detection precision and wide application range.
Drawings
FIG. 1 is a schematic diagram of the system architecture of the present invention.
FIG. 2 is a schematic flow diagram of the process of the present invention.
Description of reference numerals:
1-calibrating a solution device, 2-a solution pump, 3-an argon bottle, 4-a pressure reducing valve, 5-a gas valve switch, 6-a flow controller, 7-a flow integrating instrument, 8-a first electric valve, 9-a hydraulic cylinder, 10-a first vortex street flowmeter, 11-a fixed support, 12-an installation fixed platform, 13-a second vortex street flowmeter, 14-a third vortex street flowmeter, 15-a second electric valve, 16-a calibrating pipeline, 17-a standard metering barrel, 18-a drainage pneumatic valve and 19-a constant-pressure constant-current tank.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict.
It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention, and the components related to the present invention are only shown in the drawings rather than drawn according to the number, shape and size of the components in actual implementation, and the type, quantity and proportion of the components in actual implementation may be changed freely, and the layout of the components may be more complicated.
As shown in fig. 1, the system for calibrating and detecting a gas-liquid mixed flow vortex shedding flowmeter in this embodiment includes:
a calibration solution output unit for outputting a calibration solution;
the gas injection unit is used for injecting gas into the output calibration solution;
the calibration pipeline 16 is used for enabling the output calibration solution to sequentially pass through the gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
the flow control unit is used for controlling the gas flow and calibrating the solution flow;
the standard metering barrel 17 is a standard metering device for production calibration and detection of the gas-liquid mixed flow type vortex shedding flowmeter; and the calibration detection unit is used for calculating a calibration output coefficient and calculating the precision of the gas volume flow.
The calibration solution output unit in the embodiment comprises a calibration solution device 1, a solution pump 2 and a constant-current constant-pressure tank 19, the gas injection unit comprises an argon bottle 3, the flow control unit comprises a pressure reducing valve 4, a gas valve switch 5, a flow controller 6, a hydraulic cylinder 9, an electric valve 8 and an electric valve 15, and the calibration output coefficient and the precision of calculating the gas volume flow are calculated through the marking detection unit, so that the calibration detection of the gas-liquid mixed flow vortex shedding flowmeter is completed.
In this embodiment, the gas-liquid mixed vortex flowmeter measures the measured medium solution and must have the conductive property, and since the frequency of the sensor detecting the output vortex signal is directly proportional to the flow rate of the conductive measured medium solution, a mathematical relation between the vortex signal frequency f1 and the volume flow rate v1 of the conductive measured medium solution is established:
v1＝k1f1(1)
in the formula, v1The average flow velocity of the measured medium solution passing through the conductivity in the sensor pipeline is m/s; f1 is the vortex signal frequency, Hz; k1 is a coefficient related to the volume flow, is also a coefficient needing calibration solution in actual production calibration, and is dimensionless;
the flow velocity v of the medium solution to be tested in the pipeline is solved by applying the formula (1)1And the total volume of the conductive measured medium solution flowing through the vortex shedding flowmeter can be obtained according to the cross section area of the pipeline of the sensor and the cumulative amount of the passing cross section area in unit time:
in the formula, q1M is the volume total of the medium solution to be measured3(ii) a S is vortex shedding flowmeter sensor measurementCross-sectional area of measuring pipe, m2；tiIs the unit time, S.
Presetting a coefficient k before metering and calibrating the gas-liquid mixed vortex shedding flowmeter, and assigning an initial value; then the conductive measured medium solution is in a state of completely filling the pipeline and flows through the vortex generator for a period of time, and then the total amount q of measurement and the measurement reading q of the standard measuring bucket are output according to the vortex shedding flowmeter1Calibrating the output coefficient k1Computing
In this embodiment, when the measured medium solution contains a certain proportion of bubbles flowing through the sensor signal detection electrode, the vortex street signal generated behind the vortex generator is strong and stable, with the increase of the gas content in the gas-liquid two-phase flow, the formation and falling of the vortex is affected by the existence of the bubbles, the energy of the vortex street signal and the approximate vortex street signal is gradually weakened, and the mathematical relation between the vortex signal-to-noise ratio and the volume flow rate Va of the content of bubbles in the conductive measured medium solution is established:
Va＝Kp/(10×lg(Ps/Pn)) (4)
in the formula, Va is the volume flow of the bubble content of the conductive measured medium solution, and L/min; kpThe gas-liquid mixed vortex flowmeter sensor is used for measuring the coefficient related to the bubble content of the conductive measured medium solution, and the coefficient is dimensionless; psThe power spectral density of a flow signal is W/Hz when the conductive measured medium solution does not contain bubbles; pnThe power spectral density of the flow signal when the conductive medium solution to be detected contains bubbles is W/Hz.
Before the measurement and calibration of the gas-liquid mixed vortex shedding flowmeter, a coefficient K is presetp1And assigning an initial value; then starting the flow integrating instrument 7, setting and controlling the flow controller 6 to ensure that the conductive measured medium solution is injected into the stable constant flow gas, and calculating the output bubble volume flow V according to the gas-liquid mixed vortex shedding flowmeter after working for a period of timea1Gas volume flow with the measured output of the flow totalizerQuantity display VaCalibrating the output coefficient kpAnd (4) calculating a final coefficient required by the volume flow output and the volume total output of the medium solution detected by the meter.
Kp＝Kp1Va/Va1(5)
The embodiment also comprises a flow integrating instrument 7, which is used for controlling the gas flow which outputs stable constant flow to the calibration solution, controlling the gas output quantity through the flow integrating instrument, and calculating the precision of the gas volume flow through the following formula:
FS％＝fabs(Va-Va1)/Va×100％ (6)
wherein FS is the accuracy of the gas volume flow, Va1For outputting a volumetric flow of gas, VaAnd the volume flow rate display of the gas output by the flow integrating instrument control.
Correspondingly, the embodiment also provides a calibration detection control method of the gas-liquid mixed flow type vortex shedding flowmeter, which comprises the steps of extracting a calibration solution and outputting the calibration solution;
injecting gas into the output calibration solution, and enabling the output calibration solution to sequentially pass through a gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
controlling the gas flow and the calibration solution flow;
and calculating the calibration output coefficient and the precision of calculating the gas volume flow according to the gas flow and the calibration solution flow, and completing the calibration and measurement of the gas-liquid mixed flow type vortex shedding flowmeter to be calibrated.
In this embodiment, the flow control unit controls the calibration solution to fill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed manner, and sequentially carries out sectional numerical interception on the signal frequency to respectively serve as the calibration point of the flow;
adjusting the flow of the calibration solution to meet the frequency value of the calibration point;
the calibration detection unit clears the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter and discharges a calibration solution;
the flow control unit controls the calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and the calibration detection unit records the total volume reading of the gas-liquid mixed vortex shedding flowmeter to be calibrated and the reading of the standard metering barrel;
and repeating the steps until the calibration of all the calibration points is completed.
The flow control unit controls a calibration solution to fill a calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed mode, and the signal frequency is sequentially subjected to sectional numerical interception and is respectively used as a flow detection point;
adjusting the flow of the calibration solution to meet the frequency value of the detection point;
the calibration detection unit clears the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter and discharges a calibration solution;
the flow control unit controls the calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and the calibration detection unit records the total volume readings of all the gas-liquid mixed vortex shedding flowmeters and the readings of the standard metering barrel;
repeating the steps until the calibration detection of all the detection points is completed;
the calibration detection unit sequentially carries out sectional numerical interception according to the same signal frequency as the detection point and serves as a gas content detection flow point under the constant current of the conductive detected medium solution;
the calibration detection unit selects gas injection quantity points with different values and injects the gas injection quantity points into the conductive medium solution to be detected respectively;
adjusting the flow of the conductive measured medium solution to meet the frequency value of the detection point, controlling the flow control unit to output the gas injection quantity with the same value as the selected gas injection quantity point, calibrating the detection unit to record the current gas injection quantity value in a delayed manner, and calibrating the bubble content in the conductive measured medium solution output by each gas-liquid mixed vortex shedding flowmeter;
and repeating the steps until the gas content in the conductive measured medium solution of all the gas injection quantity points is detected, and the gas content in the conductive measured medium solution of all the gas injection quantity points under all the frequency points is detected, so that the detection of the gas bubble content is completed.
The following is a detailed description of a specific example:
taking the caliber of DN40 as an example,
1) adjusting the first electric valve 8 and the second electric valve 15 to a fully open state to fully fill the calibration pipeline 16 and the first gas-liquid mixed vortex shedding flowmeter 10, the second gas-liquid mixed vortex shedding flowmeter 13 and the third gas-liquid mixed vortex shedding flowmeter 14 to be calibrated with the conductive calibration medium solution;
2) delaying for 2 minutes, recording the frequency of a signal output by the gas-liquid mixed vortex shedding flowmeter 10, carrying out numerical interception on the frequency according to the proportion of 1.0, 0.8, 0.6, 0.4, 0.2, 0.1, 0.05 and 0.02 to serve as a flow calibration point, and counting 8 flow calibration points from front to back;
3) adjusting the opening degree of the electric valve 8 to enable the opening degree to meet the 1 st calibrated frequency value, then closing the second electric valve 15, carrying out zero clearing operation on the total amount metered and output on the first gas-liquid mixed vortex shedding flowmeter 10, simultaneously opening the drainage air-operated valve 18, and discharging the conductive measured medium solution in the standard metering barrel 17 to the utmost extent;
4) delaying for 1 minute, and closing the drainage pneumatic valve 18;
5) manually and quickly opening the electric valve 15 to a full-open state, delaying the metering for about 3-5 minutes, and then closing the second electric valve 15;
6) sequentially recording the total volume readings of the first gas-liquid mixed vortex shedding flowmeter, the second gas-liquid mixed vortex shedding flowmeter and the third gas-liquid mixed vortex shedding flowmeter from front to back, and then recording the readings of the standard measuring barrel 17;
7) repeating the step 3) to the step 6) to finish the calibration of other frequency output points;
8) sequentially carrying out meter coefficients k of the gas-liquid mixed vortex shedding flowmeter to be calibrated from front to back, and writing the coefficient k output by each corresponding calculation into a converter of the gas-liquid mixed vortex shedding flowmeter to be calibrated;
9) according to the signal frequency output by the gas-liquid mixed vortex shedding flowmeter 10 recorded in the step 2), carrying out numerical interception according to the proportion of the frequency of 1.0, 0.8, 0.6, 0.4, 0.2 and 0.1, and taking the numerical interception as the selection of gas flow calibration under constant flow;
10) adjusting the opening degree of the first electric valve 8 to meet the frequency value of the 1 st constant-current point in the step 9), and keeping the second electric valve 15 and the drainage air-operated valve 18 in a fully open state;
11) according to different calibers of the gas-liquid mixed vortex shedding flowmeter sensors, gas flow calibration of a certain number of points is selected, in the example, a gas-liquid mixed vortex shedding flowmeter with the calibers of DN40 is selected for gas flow calibration, and gas injection quantities of 7 points of 6.0L/min, 5.0L/min, 4.0L/min, 3.0L/min, 2.0L/min, 1.0L/min and 0.5L/min are respectively selected for gas content calibration points in the medium solution to be measured in the electrical conductivity;
12) opening a gas valve switch 5, setting a flowmeter calculator 7 according to the 1 st point gas injection amount (6.0L/min) in the step 11), delaying for 2 minutes, and waiting for stable gas injection;
12) recording the current gas injection quantity value, and then recording the signal-to-noise ratio of vortex signals output by the first gas-liquid mixed vortex shedding flowmeter, namely 10 Xlg (P) from front to backs/Pn)；
14) Repeating the steps 12) to 13) to finish the calibration of the gas content in the medium solution to be measured of the conductivity at other gas injection quantity points;
15) repeating the steps 10) to 14), and completing the calibration of the gas content in the conductivity measured medium solution of all gas injection quantity points under all frequency points;
16) calculating a correlation coefficient Kp between the gas bubble content output and the gas-liquid mixed vortex shedding flowmeter to be calibrated in sequence from the front to the back, and writing the calculation result into a converter corresponding to each gas-liquid mixed vortex shedding flowmeter to be calibrated;
17) carrying out numerical interception on the maximum signal frequency output by the first gas-liquid mixed vortex shedding flowmeter 10 in the step 2) according to the proportion of 1.0, 0.75, 0.5, 0.25 and 0.1 respectively to be used as a flow detection point;
18) manually adjusting the opening of the first electric valve 8 to enable the opening to meet the 1 st verification frequency value, then closing the second electric valve 15, carrying out zero clearing operation on the total amount metered and output on the vortex shedding flowmeter, simultaneously opening the drainage pneumatic valve 18, and discharging the conductive medium solution to be tested in the standard metering tank 17 to the greatest extent;
19) delaying for 1 minute, and closing the drainage pneumatic valve 18;
20) manually and quickly opening the second electric valve 15 to a full-open state, delaying for about 3-5 minutes for metering, and then closing the second electric valve 15;
21) sequentially recording the total volume readings of the gas-liquid mixed vortex shedding flowmeter from front to back by a first record to a third record, and then recording the readings of the standard measuring barrel;
22) repeating the steps 18) to 21), and completing the verification of other frequency output points;
23) sequentially calculating the precision FS% of the instrument of the gas-liquid mixed vortex shedding flowmeter to be calibrated from the front to the back to finish calibration detection;
24) recording 5 signal frequency points output by the first gas-liquid mixed vortex shedding flowmeter 10 in the step 17) as gas flow detection points, and carrying out numerical interception according to the proportion of the frequency of 1.0, 0.8, 0.6, 0.4, 0.2 and 0.1 to obtain a gas content detection flow point under the constant current of the conductive medium solution to be detected;
25) selecting 5 points of gas injection quantity of 6.0L/min, 4.0L/min, 2.0L/min, 1.0L/min and 0.5L/min to carry out gas content detection point in the medium solution to be detected;
26) manually adjusting the opening of the first electric valve 8 to meet the 1 st verification frequency value, and keeping the second electric valve 15 and the drainage pneumatic valve in a fully open state;
27) controlling and regulating the flow integrating instrument 7 to control the mass flow controller to output gas injection quantity of 6.0L/min;
28) delaying for about 2 minutes, recording the current gas injection quantity value, and then recording the bubble content in the conductive medium solution to be measured output by the gas-liquid mixed vortex shedding flowmeter 1-3 complete machine instruments from front to back;
29) repeating the steps 27) to 28), and completing the detection of the gas content in the conductivity measured medium solution at other gas injection quantity points;
30) repeating the steps 24) to 29), and completing the detection of the gas content in the conductivity measured medium solution at all gas injection quantity points at all frequency points;
31) and performing precision calculation of the heavy bubble content of the instrument gas-liquid mixture of the gas-liquid mixed vortex shedding flowmeter from the front to the back in sequence to finish detection of the bubble content.
The foregoing embodiments are merely illustrative of the principles and utilities of the present invention and are not intended to limit the invention. Any person skilled in the art can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Accordingly, it is intended that all equivalent modifications or changes which can be made by those skilled in the art without departing from the spirit and technical spirit of the present invention be covered by the claims of the present invention.
Claims (8)
1. The utility model provides a gas-liquid mixture STREAMING vortex shedding flowmeter marks detection device system which characterized in that includes:
a calibration solution output unit for outputting a calibration solution;
the gas injection unit is used for injecting gas into the output calibration solution;
the calibration pipeline is used for enabling the output calibration solution to sequentially pass through the gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
the flow control unit is used for controlling the gas flow and calibrating the solution flow;
the standard metering barrel is used for standard metering of production calibration and detection of the gas-liquid mixed flow type vortex shedding flowmeter;
the calibration detection unit is used for calculating a calibration output coefficient and calculating the precision of the gas volume flow;
the device also comprises a flow integrating instrument which is used for controlling and outputting the gas flow of stable constant flow to a calibration solution, wherein the calibration solution is a conductive measured medium solution;
the accuracy of the gas volume flow is calculated by the following formula:
FS％＝fabs(Va-Va1)/Va×100％
wherein FS is the accuracy of the gas volume flow, Va1The volume total amount V of the calibrated medium solution output by the gas-liquid mixed flow type vortex shedding flowmeteraThe volume total amount of the calibration medium solution metered by the calibration metering barrel;
the flow control unit controls a calibration solution to fill a calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed mode, and the signal frequency is sequentially subjected to sectional numerical interception and is respectively used as a flow detection point.
2. The gas-liquid mixed flow type vortex shedding flowmeter calibration and detection device system as recited in claim 1, wherein: calculating a calibration output coefficient by the following formula:
Kp＝Kp1Va/Va1
wherein, KpTo calibrate the output coefficient, Kp1The coefficient is preset before the gas-liquid mixed vortex shedding flowmeter is calibrated.
3. The gas-liquid mixed flow type vortex shedding flowmeter calibration and detection device system as recited in claim 2, wherein:
the flow control unit controls a calibration solution to fill a calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed mode, and the signal frequency is sequentially subjected to sectional numerical interception to be respectively used as a calibration point of flow;
the flow control unit adjusts and controls the flow of the calibration medium solution in the calibration pipeline to meet the frequency value of the calibration point;
the calibration detection unit clears the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter and discharges a calibration solution;
the flow control unit controls the calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and the calibration detection unit records the total volume reading of the gas-liquid mixed vortex shedding flowmeter to be calibrated and the reading of the standard metering barrel;
and repeating the steps until the recording of all the calibration points is completed, and calculating a calibration output coefficient according to the recording.
4. The gas-liquid mixed flow type vortex shedding flowmeter calibration and detection device system as recited in claim 3, wherein:
the flow control unit controls a calibration solution to fill a calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed mode, and the signal frequency is sequentially subjected to sectional numerical interception and is respectively used as a flow detection point;
the flow control unit adjusts the flow of the conductive medium solution to be detected to meet the frequency value of the detection point;
the calibration detection unit clears the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter and discharges the flow of the conductive medium solution to be detected;
the flow control unit controls the calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, the calibration detection unit records the total volume readings of all the gas-liquid mixed vortex shedding flowmeters and the readings of the standard measuring barrel, the precision of the gas volume flow is calculated, and the calibration detection is completed;
repeating the steps until the calibration detection of all the detection points is completed;
the calibration detection unit sequentially carries out sectional numerical interception according to the same signal frequency as the detection point and serves as a gas content detection flow point under the constant current of the conductive detected medium solution;
the calibration detection unit selects gas injection quantity points with different values and injects the gas injection quantity points into the conductive medium solution to be detected respectively;
the flow control unit adjusts the flow of the conductive measured medium solution to meet the frequency value of the detected point, controls the output of gas injection quantity with the same value as the selected gas injection quantity point, calibrates the detection unit to record the current gas injection quantity value in a delayed manner and the bubble content in the conductive measured medium solution output by each gas-liquid mixed vortex shedding flowmeter;
and repeating the steps until the gas content in the conductive measured medium solution of all the gas injection quantity points is detected, and the gas content in the conductive measured medium solution of all the gas injection quantity points under all the frequency points is detected, so that the detection of the gas bubble content is completed.
5. A calibration detection control method for a gas-liquid mixed flow type vortex shedding flowmeter is characterized by comprising the following steps:
extracting and outputting a calibration solution;
injecting gas into the output calibration solution, and enabling the output calibration solution to sequentially pass through a gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
controlling the gas flow and the calibration solution flow;
calculating the precision of a calibration output coefficient and the gas volume flow according to the gas flow, the calibration solution flow and the readings of the standard measuring barrel, and completing the calibration and measurement of the gas-liquid mixed flow type vortex shedding flowmeter to be calibrated;
controlling the flow of the gas with stable constant current output to a calibration solution, wherein the calibration solution is a conductive measured medium solution;
the accuracy of the gas volume flow is calculated by the following formula:
FS％＝fabs(Va-Va1)/Va×100％
wherein FS is the accuracy of the gas volume flow, Va1In order to output the gas volume flow, Va is the gas volume flow which is controlled and output by the flow integrating instrument;
and controlling a calibration solution to fill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, recording the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed manner, and sequentially carrying out sectional numerical interception on the signal frequency to be respectively used as flow detection points.
6. The gas-liquid mixed flow type vortex shedding flowmeter calibration detection control method according to claim 5, characterized in that: calculating a calibration output coefficient by the following formula:
Kp＝Kp1Va/Va1
wherein, KpTo calibrate the output coefficient, Kp1The converter is preset coefficient before the gas-liquid mixed vortex shedding flowmeter is calibrated.
7. The gas-liquid mixed flow type vortex shedding flowmeter calibration detection control method according to claim 6, characterized in that:
controlling a calibration solution to fill a calibration pipeline and a gas-liquid mixed vortex shedding flowmeter to be calibrated, recording the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed manner, and sequentially carrying out sectional numerical interception on the signal frequency to respectively serve as a calibration point of flow;
adjusting the flow of the calibration solution through a flow control unit to meet the frequency value of the calibration point;
clearing the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter to zero, and discharging a calibration solution;
controlling a calibration solution to refill the calibration pipeline and the gas-liquid mixed vortex shedding flowmeter to be calibrated, and recording the total gas volume readings output by the gas-liquid mixed vortex shedding flowmeter to be calibrated and the readings of a standard metering barrel;
and repeating the steps until the calibration of all the calibration points is completed.
8. The gas-liquid mixed flow type vortex shedding flowmeter calibration detection control method according to claim 7, characterized in that:
controlling a calibration solution to fill a calibration pipeline and a gas-liquid mixed vortex shedding flowmeter to be calibrated, recording the signal frequency output by the gas-liquid mixed vortex shedding flowmeter in a delayed manner, and sequentially carrying out sectional numerical interception on the signal frequency to be respectively used as flow detection points;
adjusting the flow of the calibration solution through a flow control unit to meet the frequency value of the detection point;
clearing the total amount of the metering output of the gas-liquid mixed vortex shedding flowmeter to zero, and discharging a calibration solution;
controlling a calibration solution to refill a calibration pipeline and a gas-liquid mixed vortex shedding flowmeter to be calibrated, and recording the total volume readings of all the gas-liquid mixed vortex shedding flowmeters and the readings of a standard metering barrel;
repeating the steps until the calibration detection of all the detection points is completed;
sequentially carrying out sectional numerical interception according to the same signal frequency as the detection point, and taking the sectional numerical interception as a gas content detection flow point under the constant current of the conductive detected medium solution;
selecting gas injection points with different numerical values, and injecting the gas injection points into the conductive medium solution to be detected respectively;
the flow of the conductive measured medium solution is adjusted through the flow control unit to meet the frequency value of the detected point, the gas injection quantity with the same value as the selected gas injection quantity point is controlled and output, the current gas injection quantity value is recorded in a delayed mode, and the bubble content in the conductive measured medium solution output by each gas-liquid mixed vortex shedding flowmeter is obtained;
and repeating the steps until the gas content in the conductive measured medium solution of all the gas injection quantity points is detected, and the gas content in the conductive measured medium solution of all the gas injection quantity points under all the frequency points is detected, so that the detection of the gas bubble content is completed.
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