CN106774462A - Using the detection of digital frequency conversion controller and the method for regulation flow under DCS environment - Google Patents
Using the detection of digital frequency conversion controller and the method for regulation flow under DCS environment Download PDFInfo
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- CN106774462A CN106774462A CN201611031102.5A CN201611031102A CN106774462A CN 106774462 A CN106774462 A CN 106774462A CN 201611031102 A CN201611031102 A CN 201611031102A CN 106774462 A CN106774462 A CN 106774462A
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- dcs
- flow
- frequency conversion
- digital frequency
- conversion controller
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D7/00—Control of flow
- G05D7/06—Control of flow characterised by the use of electric means
- G05D7/0617—Control of flow characterised by the use of electric means specially adapted for fluid materials
- G05D7/0629—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the type of regulator means
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- Automation & Control Theory (AREA)
- Feedback Control In General (AREA)
Abstract
At Industry Control scene, the purpose of detection flows typically to control flow, because digital frequency conversion controller unites two into one the Detection ＆ Controling of flow, therefore, from for the angle of DCS, flow can be adjusted by 4~20mA current signals.From for the angle of digital frequency conversion controller, the 4~20mA current signals from DCS can be traced, flow is automatically adjusted to corresponding value.A kind of digital frequency conversion controller application process in dcs is provided based on this principle present invention, and show in particular the Computing Principle and corresponding formula of flow and cumulant, while describing the specific method that two kinds of DCS work stations obtain 4~20mA analog signals.
Description
Technical field
Fluid the present invention relates to process industry field uses numeral surely than adding technology under specifically a kind of DCS environment
The method that frequency-variable controller is detected and adjusts flow.
Background technology
Measuring pump is divided into plunger metering pump and diaphragm metering pump.Plunger metering pump simple structure, because plunger is by metal material
It is made, so without anti-corrosion function.Diaphragm metering pump complex structure, but because barrier film is made up of anti-corrosion material, therefore have anti-corrosion work(
Energy.Below by taking diaphragm metering pump as an example, traditional industry measurement pump configuration and operation principle is briefly introduced.
As shown in figure 1, the rotating shaft of threephase asynchronous machine 1 is slowed down by the reducing gear that worm screw 2 and worm gear 3 are constituted commutate,
Worm gear 3 drives the synchronous rotary of crank 4, crank 4 to drive barrier film 6 to do horizontal reciprocating movement by connecting rod 5, and a volume for stroke becomes
Change amount Δ V is represented with the region 9 of dotted line in Fig. 1.Barrier film 6 is moved to right, the increase of the volume of diaphragm cavity 10, under suction function, is entered
Mouth ball valve 7 opens, and vent ball valve 11 is closed, so as to fluid to be added is sucked into diaphragm cavity from container；Barrier film 6 is moved to left, and diaphragm cavity holds
Product reduces, and at positive pressure, inlet valve 7 is closed, and outlet valve 11 is opened, so as to the fluid in diaphragm cavity be discharged.Barrier film and
Diaphragm cavity is made up of anti-corrosive properties proprietary material, and ball valve is made up of wearability anti-corrosion material.
Conventional metered dose pump adjusts the length of crank 4 by mechanical handwheel mounted externally, to reach regulation barrier film
Stroke, so as to adjust flow purpose.However, there is highly basic, strong acid and have poison gas in many petrochemical enterprises and water process scene
Body, the artificial operation of inconvenience.
In order to the flow to measuring pump is adjusted being constituted with detection, generally use universal frequency converter and flow instrumentation
Application scheme, as shown in Fig. 2 the program needs two pairs of 4~20mA signal cables, it is general for corrosive liquids such as highly basic, strong acid
Logical flow instrumentation can not be used, and anti-corrosion type flow instrumentation is expensive.
The automatic tune of flow is realized using the alternative artificial operated by handwheel of industry measurement pump special digital frequency-variable controller
Save and simplify mechanical structure.But existing digital frequency conversion controller can only unit use, it is impossible to be connected with DCS realize it is system-level
Optimization operation.
The content of the invention
In order to solve above-mentioned technical problem present in prior art, the invention provides under a kind of DCS environment use number
The method that word frequency-variable controller is detected and adjusts flow, comprises the following steps：
(1) working frequency of digital frequency conversion controller is set to 30,40 and 50Hz, flow indication stabilization
Afterwards, the corresponding flow Q of meter record30, Q40, Q50；
(2) it is I to set the current control electric currents of DCSDCS(k), then current time DCS display flow can be calculated as follows：
(3) cumulant is calculated as follows：
AccQ (K+1)=AccQ (K)+QDCS(k)·TDCS
TDCSIt it is DCS calculating cycles or sampling period, unit should be scaled hour；
(4) detected by current control electric current and obtain flow, and flow is adjusted by the regulation to control electric current.
Further, DCS work stations obtain current signal as follows：DCS analog output modules are by output current value
Monitor workstation is fed back to by data/address bus.
Further, DCS work stations obtain current signal as follows：By 4~20mA outputs, the DCS moulds of DCS modules
Intend input and the simulation input composition series loop of digital frequency-variable controller, then current value is fed back into monitoring by AD acquisition modules
Work station.
Based on industry measurement pump special digital frequency-variable controller, the invention provides detection simultaneously under a kind of DCS environment and
Regulation flow techniques, need a pair 4~20mA signal cables to be connected with DCS, you can while the detection and regulation of flow are completed, so that
Cable and construction cost are saved, the flow instrumentation of high cost can be also saved.The industry meter that the present invention uses current unit
Amount pump special digital frequency-variable controller is extended to the system-level application field of DCS (Distributed Control System), in modernization industry life
There is important application value in product system.
Brief description of the drawings
Fig. 1 is the structural representation of Industrial membranes measuring pump；
Each reference implication in figure：1-threephase asynchronous machine, 2-worm screw, 3-worm gear, 4-crank, 5-connecting rod,
6-barrier film, 7-inlet valve, 8-entrance valve ball, 9-each stroke diaphragm chamber volume variation delta V, 10-diaphragm cavity, 11-
Outlet valve, 12-outlet valve ball.
Fig. 2 is traditional measuring pump Flow-rate adjustment and control method schematic diagram；
Fig. 3 is the schematic diagram that current signal feeds back to DCS work stations by Data Bus；
Fig. 4 is digital frequency conversion controller and DCS simulation inputs, exports the schematic diagram that is in series.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.
At commercial Application scene, the purpose of detection flows typically to control flow, because digital frequency conversion controller will
The Detection ＆ Controling of flow unite two into one, therefore, from for the angle of DCS, flow can be adjusted by 4~20mA current signals.
From for the angle of digital frequency conversion controller, the 4~20mA current signals from DCS can be traced, flow is automatically adjusted to phase
The value answered.The present invention provides a kind of digital frequency conversion controller application process in dcs based on this principle, and detailed process is such as
Under：
1. demarcated according to industry measurement pump digital frequency conversion controller operation manual.
2. after demarcating well, digital frequency conversion controller is set as " fixed frequency " pattern, digital frequency conversion controller is shown in concrete operations
Operation manual.
3. frequency converter frequency is set to 30,40 and 50Hz, after flow indication stabilization, meter record is corresponding in the following table flows
Amount Q30, Q40, Q50。
| Frequency/Hz | 30 | 40 | 50 |
| Flow/L/H | Q30 | Q40 | Q50 |
If the current control electric currents of DCS are IDCS(k), then current time DCS display flow can be calculated as follows
Cumulant
AccQ (K+1)=AccQ (K)+QDCS(k)·TDCS,
TDCSIt it is DCS calculating cycles or sampling period, unit should be scaled hour.
After 4.DCS completes configuration, digital frequency conversion controller is set as " signal " pattern before normal work, you can tracking 4
~20mA current signals are controlled to flow, and detailed process is：Flow is obtained by current control electric current, by control electricity
The regulation of stream adjusts flow.
DCS monitor workstations can one of in the following manner obtain current signal：
1. as shown in figure 3, output current value is fed back to monitor workstation by DCS analog output modules by data/address bus.
2. as shown in figure 4, by the simulation of 4~20mA of DCS modules output, DCS simulation inputs and digital frequency-variable controller
Input composition series loop, then current value is fed back into monitor workstation by AD acquisition modules.
No matter which kind of scheme is used, because digital frequency conversion controller unites two into one the Detection ＆ Controling function of flow, because
This, need only a pair of analog lines can complete the control and detection of flow, compared with the scheme of traditional flowmeter+frequency converter,
A pair of cable ropes can be saved, so as to reduce construction cost.
Claims (3)
1. comprised the following steps using the detection of digital frequency conversion controller and the method for regulation flow under a kind of DCS environment：
(1) working frequency of digital frequency conversion controller is set to 30,40 and 50Hz, after flow indication stabilization, meter picture recording should
Flow Q30, Q40, Q50；
(2) it is I to set the current control electric currents of DCSDCS(k), then current time DCS display flow can be calculated as follows：
(3) cumulant is calculated as follows：
AccQ (K+1)=AccQ (K)+QDCS(k)·TDCS
TDCSIt it is DCS calculating cycles or sampling period, unit should be scaled hour；
(4) detected by current control electric current and obtain flow, and flow is adjusted by the regulation to control electric current.
2., using the detection of digital frequency conversion controller and the method for regulation flow under DCS environment according to claim 1, it is special
Levy and be：DCS work stations obtain current signal as follows：DCS analog output modules are total by data by output current value
Line feeds back to monitor workstation.
3., using the detection of digital frequency conversion controller and the method for regulation flow under DCS environment according to claim 1, it is special
Levy and be：DCS work stations obtain current signal as follows：By 4~20mA outputs, the DCS simulation input sums of DCS modules
The simulation input composition series loop of word frequency-variable controller, then current value is fed back into monitor workstation by AD acquisition modules.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611031102.5A CN106774462B (en) | 2016-11-17 | 2016-11-17 | The method for detecting using digital frequency conversion controller under DCS environment and adjusting flow |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611031102.5A CN106774462B (en) | 2016-11-17 | 2016-11-17 | The method for detecting using digital frequency conversion controller under DCS environment and adjusting flow |
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| Publication Number | Publication Date |
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| CN106774462A true CN106774462A (en) | 2017-05-31 |
| CN106774462B CN106774462B (en) | 2019-06-21 |
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| CN201611031102.5A Active CN106774462B (en) | 2016-11-17 | 2016-11-17 | The method for detecting using digital frequency conversion controller under DCS environment and adjusting flow |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114167716A (en) * | 2021-12-03 | 2022-03-11 | 江苏海博流体控制有限公司 | Regulation type electric execution method and mechanism based on flow control |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114167716A (en) * | 2021-12-03 | 2022-03-11 | 江苏海博流体控制有限公司 | Regulation type electric execution method and mechanism based on flow control |
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| CN106774462B (en) | 2019-06-21 |
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Application publication date: 20170531 Assignee: Shandong precision product quality inspection Co.,Ltd. Assignor: JIANG University OF TECHNOLOGY Contract record no.: X2023980042381 Denomination of invention: The Method of Using Digital Frequency Conversion Controller to Detect and Adjust Flow in DCS Environment Granted publication date: 20190621 License type: Common License Record date: 20230925 |