CN104061984B - A kind of high-speed gas flow calibration system and calibration method based on laboratory multiple-way duct - Google Patents
A kind of high-speed gas flow calibration system and calibration method based on laboratory multiple-way duct Download PDFInfo
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- CN104061984B CN104061984B CN201410304883.5A CN201410304883A CN104061984B CN 104061984 B CN104061984 B CN 104061984B CN 201410304883 A CN201410304883 A CN 201410304883A CN 104061984 B CN104061984 B CN 104061984B
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Abstract
The invention discloses a kind of high-speed gas flow calibration system and calibration method based on laboratory multiple-way duct, it includes source of the gas generation device, standard scale area and table area to be measured three parts, and main controller, it is characterised in that：Air compressor machine and preceding air accumulator constitute system gas source generating device, the three-way connection (pipe) road in parallel for being respectively mounted nozzle flowmeter, vortex-shedding meter and ultrasonic flowmeter is the standard scale area of system, and rear air accumulator is the table area to be measured of system with three three-way connection (pipe) roads in parallel of table to be measured are respectively mounted.The present invention is produced to fluid using improved Process Control System and is controlled, and improves the reliability of system source of the gas.Innovation formula has invented multiple-way duct calibration mode, system is applicable ability stronger.System can be good at being applied to the requirements of laboratory air traffic alignment.
Description
Technical field
The invention belongs to instrument and meter ambit, it is related to a kind of high-speed gas flow school based on laboratory multiple-way duct
Barebone and calibration method, it is adaptable to the demarcation of laboratory air flow.
Background technology
Gas flow standard device is segmented into primary standard（Standard）And Transfer Standards（Secondary standard）Two major classes,
The device of various patterns has been developed in the world at present.Primary standard has volumetric method and the class device of mass method two, all kinds of devices
Have static method and dynamic method point, do not use such method because it measures difficulty die the system.The system uses Transfer Standards
Method, is demarcated as standard scale from the flowmeter with good reproducibility and stability to table to be measured.Using various control
Algorithm is applied simultaneously, improves the accuracy and rapidity of system control.Various calibration pattern is available, can be in the case of various
Flowmeter demarcated.
The content of the invention
It is an object of the invention to fast and accurately be demarcated to experiment table in laboratory conditions, so as to provide one
Plant high-speed gas flow calibration system and calibration method based on laboratory multiple-way duct.
One of technical solution of the present invention：
A kind of high-speed gas flow calibration system based on laboratory multiple-way duct, it includes source of the gas generation device, standard
Table area and table area to be measured three parts, and main controller, air compressor machine and preceding air accumulator constitute system gas source generating device, are respectively mounted
The three-way connection (pipe) road in parallel of nozzle flowmeter, vortex-shedding meter and ultrasonic flowmeter is the standard scale area of system, rear air accumulator
It is the table area to be measured of system with three three-way connection (pipe) roads in parallel of table to be measured are respectively mounted.
Standard scale area three-way connection (pipe) road in parallel is connected between preceding air accumulator and rear air accumulator, three-way connection (pipe) road difference in parallel
For：Electric sleeve barrel regulating valve, pressure-reducing valve, nozzle flowmeter and temperature and pressure compensation device are sequentially connected on first via pipeline；Second tunnel
Electric sleeve barrel regulating valve, pressure-reducing valve, vortex-shedding meter and temperature and pressure compensation device are sequentially connected on pipeline；On three-way connection (pipe) road successively
Connection electric sleeve barrel regulating valve, pressure-reducing valve, ultrasonic flow and temperature and pressure compensation device.
The caliber difference in standard scale area three-way connection (pipe) road in parallel：It is first via caliber DN20mm, the second road caliber DN50mm,
Three-way connection (pipe) footpath DN50mm.
Each pipeline is sequentially connected pressure-reducing valve, flowmeter to be measured and temperature and pressure compensation dress in table area to be measured three-way connection (pipe) road in parallel
Put.
The caliber difference in table area to be measured three-way connection (pipe) road in parallel：4th road caliber DN20mm, the 5th road caliber DN32mm, the
Six road caliber DN50mm.
The specification of preceding air accumulator is 2.0m3/1.3mpa, and the total 2788mm high of volume, volume diameter 1000mm, import and export is equal
It is DN80mm；The specification of air accumulator is 1.0m3/1.3mpa afterwards, and the total 2331mm high of volume, volume diameter 800mm, import and export is equal
It is DN65mm.
The controlled electric sleeve barrel regulating valve of main controller connection and the flowmeter with temperature and pressure compensation constitute closed loop, system power supply
All provided by main controller, each sensor connects the AIW of main controller, electric sleeve barrel regulating valve connects the AQW of main controller, main controller
It is connected with PC by RS485 buses.
The two of technical solution of the present invention：
A kind of high-speed gas flow calibration method based on laboratory multiple-way duct, the implementation process of calibration method is divided into control
System is realized and configuration realizes two parts：
Control realization is：Control realization is divided into general closed-loop control and the Self Adaptive Control of valve again, and controller PLC is used
Configuration software carries out upper computer detection, and the difference according to the flow value for setting and the flow value for detecting carries out computing, and changes
Become the purpose that sleeve adjusting valve realizes control pipeline flow；
PID controller is a kind of linear controller, and it is to the deviation e between set-point r (t) and real output value y (t)
T () is controlled, the controlled device of system is electric sleeve barrel regulating valve；
Corresponding data according to multigroup valve opening and flow fits multinomial using curve-fitting method, using once
Polynomial fitting method is that Linear Quasi merges using the approximating method of least square method, and real-time setting value is substituted into multinomial fortune
Calculation obtains a valve opening reference value；Again optimizing regulation purpose is reached by adjusting algorithm shortening regulating time；
Configuration is embodied as：Host computer carries out the control interface foundation of system and setting for parameter from configuration software MCGS 5.5
Put, the real-time data base that form is input to configuration first is made to all parameters designed in system, be that calling for follow-up configuration is done
Prepare；
In calibration mode needed for being selected by configuration software：
Single channel pattern has 9 tunnel selection modes, has 3 kinds of standard scales to select for table to be measured；Ginseng is set by host computer
After examining flow, automatically adjusting valve aperture by system makes pipeline flow reach setting value, carries out discharge record；Thereafter change
Several groups of flow values, record the display data of standard scale and table to be measured respectively；Similar preferential original is pressed in the selection for marking timing standard table
Then, i.e., it is preferential to ensure that standard scale and test table are same type；Fluid properties are tested simultaneously, by flowmeter of the same race
Flow difference in the case of different pipe diameters carrys out Study of Fluid discharge characteristic, in theory when flow velocity becomes less than 50m/s, air pressure
In the case of changing less, it is believed that gas is Incompressible gas；
Multichannel pattern has 40 kinds, and the accurate of single channel calibration experiment validation criteria table was carried out before multichannel demarcation is carried out
Property, will otherwise cause the invalid of nominal data below；
Multichannel is demarcated coverage rate and is divided by demarcation form, is demarcated comprising table test performance to be measured checking and meter accuracy to be measured；
It is divided into 1+n, 2+n, 3+n totally three big kinds, wherein digitized representation standard scale number by control method, n represents table number to be measured；Wherein
Under 1+n patterns, work as n=2,12 paths are had when 3；Under 2+n patterns, n=1,2,3 have 21 paths；Under 3+n patterns, n=1,
2,3 have 7 paths, select required system pass, multichannel to demarcate the actual verification for being considered as and being demarcated to table to be measured on demand, rise
To the effect for proving its performance parameter.
The present invention is controlled to electric sleeve barrel regulating valve by the main controller being connected with host computer and realizes pipeline flow control
The purpose of system.The control algolithm of use not only comprising closed loop PID but also combined Self Adaptive Control, adapted to various severe operation rings
Border, strong antijamming capability is highly reliable, far above other various controllers, for the precision of control provides safeguard.Simultaneity factor
Can well stablize chimneying there is provided the double air accumulators of design, improve the reliability of calibration system；Design multichannel calibration pipeline,
Various calibration modes are capable of achieving, calibration system applicable situation is wider, enriches demarcation mode and improves stated accuracy.
In a word, the present invention is produced to fluid using improved Process Control System and is controlled, and improves system source of the gas
Reliability.Innovation formula has invented multiple-way duct calibration mode, system is applicable ability stronger.System can be good at being applied to
The requirements of laboratory air traffic alignment.
Brief description of the drawings
The structure drawing of device of Fig. 1, the high-speed gas flow calibration method of laboratory multiple-way duct；
Fig. 2, demarcation state diagram transition diagram；
Fig. 3, system control block figure；
Fig. 4, valve opening closed-loop control flow chart；
Fig. 5, valve adaptive algorithm are realized.
In figure：
Fig. 1 gives the structure chart of invented flow calibration system, all process variables of system is covered substantially and is related to
And equipment.Fig. 2 gives 49 kinds of calibration modes of calibration system, and wherein dotted line represents single channel calibration, realizes represent multichannel school
It is accurate.Fig. 3 gives the control block diagram of system, and the links of closed-loop control are given in figure.Fig. 4 gives PLC closed-loop controls
Program flow diagram.Fig. 5 is the process that fitting of a polynomial is carried out using least square method, and the multinomial of fitting is applied to valve
Aperture is controlled.
Air compressor machine 1, preceding air accumulator 2, the first via pipeline 3-1, the second road pipeline 3-2, three-way connection (pipe) road 3-3, electric sleeve barrel
Regulating valve 4, pressure-reducing valve 5, nozzle flowmeter 6-1, vortex-shedding meter 6-2, ultrasonic flowmeter 6-3, temperature and pressure compensation device 7, after
Air accumulator 8, the 4th road pipeline 9-1, the 5th road pipeline 9-2, the 6th road pipeline 9-3, pressure-reducing valve 10, flowmeter to be measured 11, temperature and pressure
Compensation device 12.
Specific embodiment
Embodiment 1：
Calibration system master-plan：A kind of high-speed gas flow calibration system based on laboratory multiple-way duct, system is common
It is divided into system gas source generating device, standard scale area and table area to be measured three parts.Air compressor machine adds preceding air accumulator to constitute system source of the gas
Generation device；It is system to be respectively mounted the three-way connection (pipe) road in parallel of nozzle flowmeter, vortex-shedding meter and ultrasonic flowmeter
Standard scale area, rear air accumulator adds the table area to be measured for being respectively mounted that three three-way connection (pipe) roads in parallel of table to be measured are system.
Source of the gas is produced and gas buffer：System selects two air accumulators, and the specification of preceding air accumulator is 2.0m3/
1.3mpa, the total 2788mm high of volume, volume diameter 1000mm, import and export is DN80.The specification of air accumulator is 1.0m3/ afterwards
1.3mpa, the total 2331mm high of volume, volume diameter 800mm, import and export is DN65.Mozzle customization carries 50mm, 20mm,
50mm jointings and customization carry 20mm, and 32mm, 50mm jointing are respectively used to air accumulator and three road standard scales before system
The connection in area and the connection in rear air accumulator and three tunnels experiment table area, the pipeline of all selections of system are all 304 stainless steels, connect
Mouth is using flange connection.
Standard pipe area：Standard pipe area is made up of the three-way connection (pipe) road that caliber is respectively DN20mm, DN50mm and DN50mm,
The proving flowmeter installed on standard pipe is respectively nozzle flowmeter, vortex-shedding meter and ultrasonic flowmeter.Normal flow
Sensor has nozzle flowmeter, vortex-shedding meter, ultrasonic flowmeter, and model is respectively：Calibrating nozzle JCLGBY-
0020024432 its installation bore is DN20mm, with 1.0 class precisions, 4-20MA outputs；Vortex-shedding meter JCUF-1305-
1001-1010 its installation bore DN50 precision is 0.5 grade, and range of flow is 12.81-339.9 cubes m/h, and scene shows
Show, 4-20MA outputs, its mounting means of power supply 24V is connected for flange；Ultrasonic flowmeter is from GE companies of the U.S.
PT878GC-01 high-precision gas ultrasonic flowmeters, up to 0.5%, the flowmeter uses outer clip mounting means to precision.Electronic set
Cylinder regulating valve, wherein a from model ZRSM-16C is DN20mm, and two is DN50mm valve body material carbon steels, and internals are stainless
Steel, flange connection, with 220V YEs, input and output 4-20mA, it is Linear regulating valve.PLC CPU224XP integrated 14
Input/10 exports totally 24 digital quantity I/O points, and 2 inputs/1 export totally 3 analog quantity I/O points, can connect 7 expansion modules, most
Big expanding value is to the tunnel analog quantity I/O points of 168 railway digital amount I/O Dian Huo 38.2 RS485 communications/programming ports, communicate with PPI and assist
View, MPI communications protocol and free way ability to communicate.Expanding two panels EM235 can realize 4 road analog inputs and the simulation of 1 tunnel
Amount output function.Other equipment type selecting contains globe valve, pressure-reducing valve, intelligence instrument, system framework etc..Globe valve selects Q11F-
16, pressure-reducing valve selects Y43H-16, and system uses intelligent AI-818 instrument, and 4~20mA of linear current electric currents are exported, comprising
Artificial intelligence regulating algorithm, fuzzy and parameter self-tuning function, precision 0.1%.Also included in system gas tank with suit
Put such as centrifugal oil-water separator（T-002K）, supervisor pipe filter（A-002K）, micro- mist resistant filter（A-002K）.
Experimental channel area：Experimental channel area is made up of the three-way connection (pipe) road that caliber is respectively DN20mm, DN32mm and DN50mm,
Experiment table can be selected voluntarily.
Implementation process can be divided into configuration and realize and control realization two parts：
Control realization：Control realization can be divided into general closed-loop control and the Self Adaptive Control of valve again, such as Fig. 3 and Fig. 4 institutes
Show, controller PLC is according to setting（Plan carries out upper computer detection using configuration software）Flow value and the flow value for detecting
Difference carry out computing, and change the purpose that sleeve adjusting valve realizes control pipeline flow.PID controller is a kind of Linear Control
Device, it is controlled to deviation e (t) between set-point r (t) and real output value y (t)；As shown in Figure 5 from the reality of the system
Border situation is set out, and the controlled device of system is electric sleeve barrel regulating valve, and the aperture regulation time of regulating valve is partially long and in aperture
During regulation system can not enter line parameter change otherwise system will into next regulating cycle, this will cause system control lose
Lose.Intend making tune using additional opened loop control electric sleeve barrel regulating valve further to improve the regulating time of system, controllable precision
Section valve opening realizes Automatic adjusument so as to reduce validity and control accuracy that regulating time improves control.According to multigroup valve
The corresponding data of aperture and flow can fit suitable multinomial using curve-fitting method, real-time setting value be substituted into many
Item formula computing can be quickly obtained a valve opening reference value.Again by adjust algorithm can shorten regulating time reach it is excellent
Change regulation purpose.It is linear unit that the system flowmeter is most, therefore is considered as a polynomial fitting method（Linear fit）
And using the approximating method of least square method.
Configuration is embodied as：Host computer carries out the control interface foundation of system and setting for parameter from configuration software MCGS 5.5
Put, the real-time data base that form is input to configuration first is made to all parameters designed in system, be that calling for follow-up configuration is done
Prepare.
Calibration process：As shown in Fig. 2 by the calibration mode needed for configuration software selection, single channel pattern can have 9 tunnels to select
Pattern, has 3 kinds of standard scales to select for table to be measured.After host computer sets reference flow, automatically adjusted by system
Valve opening makes pipeline flow be rapidly achieved setting value, you can carry out discharge record.Thereafter change several groups of flow values, remember respectively
The display data of the lower standard scale of record and table to be measured.Similar priority principle is pressed in the selection for marking timing standard table, i.e., preferential to ensure standard
Table and test table are same type.The system can also fluid properties tested, by flowmeter of the same race in different pipelines
Flow difference in the case of caliber carrys out Study of Fluid discharge characteristic（In theory when flow velocity is less than 50m/s, the little situation of air pressure change
Down it is believed that gas is Incompressible gas）.Multichannel pattern has 40 kinds, and multichannel is demarcated coverage rate and divided by demarcation form extensively
Mainly demarcated comprising table test performance to be measured checking, meter accuracy to be measured.It is totally three big 1+n, 2+n, 3+n to be broadly divided into by control method
Plant, wherein digitized representation standard scale number, n represents table number to be measured.If Fig. 2 is that multichannel demarcates state diagram, wherein 9 dotted line bags
It is contained in single channel decomposition demarcation, is completely filled to pursue figure herein.Needed to carry out single channel mark before multichannel demarcation is carried out
Determine the accuracy of experimental verification standard scale, will otherwise cause the invalid of nominal data below.This quasi-mode is mainly to be tested
Confirmation is tested, front end standard instrument is surveyed with table area to be measured survey data carry out contrast for verify table to be measured calibration imitate
Really, it can also be used to which differentiation has larger error table to be measured.Wherein under 1+n patterns, work as n=2,12 paths are had when 3；2+n patterns
Under, n=1,2,3 have 21 paths；Under 3+n patterns, n=1,2,3 have 7 paths, are needed for can flexibly selecting on demand
System path, multichannel demarcates the actual verification that can be considered and demarcated to table to be measured, plays a part of to prove its performance parameter.
Claims (1)
1. a kind of high-speed gas flow calibration method based on laboratory multiple-way duct, calibration system include source of the gas generation device,
Standard scale area and table area to be measured three parts, and main controller, air compressor machine and preceding air accumulator constitute system gas source generating device, respectively
The three-way connection (pipe) road in parallel for installing nozzle flowmeter, vortex-shedding meter and ultrasonic flowmeter is the standard scale area of system, is stored up afterwards
Gas tank is the table area to be measured of system with three three-way connection (pipe) roads in parallel of table to be measured are respectively mounted, it is characterised in that calibration method
Implementation process is divided into control realization and configuration realizes two parts：
Control realization is：Control realization is divided into general closed-loop control and the Self Adaptive Control of valve again, and controller PLC uses configuration
Software carries out upper computer detection, and the difference according to the flow value for setting and the flow value for detecting carries out computing, and changes set
Cylinder regulating valve realizes the purpose of control pipeline flow；
PID controller is a kind of linear controller, and it enters to deviation e (t) between set-point r (t) and real output value y (t)
Row control, the controlled device of system is electric sleeve barrel regulating valve；
Corresponding data according to multigroup valve opening and flow fits multinomial using curve-fitting method, using once multinomial
Formula approximating method is that Linear Quasi merges using the approximating method of least square method, and real-time setting value substitution multinomial operation is obtained
To a valve opening reference value；Again optimizing regulation purpose is reached by adjusting algorithm shortening regulating time；
Configuration is embodied as：Host computer sets up the setting with parameter from the control interface that configuration software MCGS 5.5 carries out system, first
All parameters to being designed in system are made the real-time data base that form is input to configuration, are that calling for follow-up configuration is prepared；
In calibration mode needed for being selected by configuration software：
Single channel pattern has 9 tunnel selection modes, has 3 kinds of standard scales to select for table to be measured；Reference stream is set by host computer
After amount, automatically adjusting valve aperture by system makes pipeline flow reach setting value, carries out discharge record；Thereafter several groups of streams are changed
Value, records the display data of standard scale and table to be measured respectively；Similar priority principle is pressed in the selection for marking timing standard table, i.e., excellent
First ensure that standard scale and test table are same type；Simultaneously fluid properties tested, by flowmeter of the same race in difference
Flow difference in the case of pipe diameter carrys out Study of Fluid discharge characteristic, in theory when flow velocity is little less than 50m/s, air pressure change
In the case of, it is believed that gas is Incompressible gas；
Multichannel pattern has 40 kinds, and the accuracy of single channel calibration experiment validation criteria table was carried out before multichannel demarcation is carried out,
The invalid of nominal data below will otherwise be caused；
Multichannel is demarcated coverage rate and is divided by demarcation form, is demarcated comprising table test performance to be measured checking and meter accuracy to be measured；By control
Method processed is divided into 1+n, 2+n, 3+n totally three big kinds, wherein digitized representation standard scale number, and n represents table number to be measured；Wherein 1+n
Under pattern, work as n=2,12 paths are had when 3；Under 2+n patterns, n=1,2,3 have 21 paths；Under 3+n patterns, n=1,2,3
7 paths are had, selects required system pass, multichannel to demarcate the actual verification for being considered as and being demarcated to table to be measured, play on demand
Prove the effect of its performance parameter.
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| CN201410304883.5A CN104061984B (en) | 2014-06-30 | 2014-06-30 | A kind of high-speed gas flow calibration system and calibration method based on laboratory multiple-way duct |
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| CN112212950B (en) * | 2020-09-25 | 2023-12-19 | 北京七星华创流量计有限公司 | Calibration system and calibration method of flowmeter |
| CN112611437B (en) * | 2020-12-28 | 2023-12-22 | 南京应诺测控技术有限公司 | Pulse data merging system and method |
| CN114428521B (en) * | 2021-12-14 | 2024-07-09 | 中国石油化工股份有限公司 | Chlorine flow control method based on vortex shedding flowmeter |
| CN114623904B (en) * | 2022-03-14 | 2023-07-25 | 中公高远(北京)汽车检测技术有限公司 | Device and method for calibrating gas flowmeter |
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