CN106774462B - The method for detecting using digital frequency conversion controller under DCS environment and adjusting flow - Google Patents
The method for detecting using digital frequency conversion controller under DCS environment and adjusting flow Download PDFInfo
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- CN106774462B CN106774462B CN201611031102.5A CN201611031102A CN106774462B CN 106774462 B CN106774462 B CN 106774462B CN 201611031102 A CN201611031102 A CN 201611031102A CN 106774462 B CN106774462 B CN 106774462B
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- Prior art keywords
- 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
Abstract
At Industry Control scene, the purpose of detection flows is typically to control flow, since the Detection & Controling of flow are combined into one by digital frequency conversion controller, for the angle of DCS, flow can be adjusted by 4~20mA current signal.For the angle of digital frequency conversion controller, 4~20mA current signal from DCS can be traced, flow is automatically adjusted to be worth accordingly.A kind of application method of digital frequency conversion controller in dcs is provided based on this principle present invention, and shows 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 signal.
Description
Technical field
It is fixed than adding technology that the present invention relates to the fluids in process industry field, uses number under specifically a kind of DCS environment
Method frequency-variable controller detection and adjust flow.
Background technique
Metering pump is divided into plunger metering pump and diaphragm metering pump.Plunger metering pump structure is simple, because plunger is by metal material
It is made, so without anti-corrosion function.Structure is complicated for diaphragm metering pump, but since diaphragm is made of anti-corrosion material, there is anti-corrosion function
Energy.Below by taking diaphragm metering pump as an example, traditional industry measurement pump configuration and working principle are briefly introduced.
It commutates as shown in Figure 1, the shaft of threephase asynchronous machine 1 is slowed down by the deceleration mechanism that worm screw 2 and worm gear 3 form,
Worm gear 3 drives 4 synchronous rotary of crank, and crank 4 drives diaphragm 6 to do horizontal reciprocating movement by connecting rod 5, and the volume of a stroke becomes
Change amount Δ V is indicated with the region 9 that dotted line in Fig. 1 surrounds.Diaphragm 6 moves to right, and 10 volume of diaphragm cavity increases, and under the action of negative pressure, enters
Mouth ball valve 7 opens, and vent ball valve 11 is closed, so that fluid to be added is sucked diaphragm cavity from container；Diaphragm 6 moves to left, and diaphragm cavity holds
Product reduces, and at positive pressure, inlet valve 7 is closed, and outlet valve 11 is opened, so that the fluid in diaphragm cavity is discharged.Diaphragm and
Diaphragm cavity is made of anti-corrosive properties proprietary material, and ball valve is made of wearability anti-corrosion material.
Conventional metered dose pump adjusts the length of crank 4 by being mounted on external mechanical handwheel, to reach adjusting diaphragm
Stroke, to adjust flow purpose.However, there are highly basic, strong acid and there is poison gas at many petrochemical enterprises and water process scene
Body, inconvenient manual operation.
In order to which the flow to metering pump is adjusted and detects, generallys use universal frequency converter and flow instrumentation is constituted
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 cannot use, and anti-corrosion type flow instrumentation is expensive.
The automatic tune of flow is realized using the industry measurement pump alternative artificial operated by handwheel of special digital frequency-variable controller
It saves and simplifies mechanical structure.But existing digital frequency conversion controller can only single machine use, cannot connect with DCS realization it is system-level
Optimization operation.
Summary of the invention
In order to solve the above technical problems existing in the prior art, the present invention provides number is used under a kind of DCS environment
Method word frequency-variable controller detection and adjust flow, includes the following steps:
(1) working frequency of digital frequency conversion controller is set to 30,40 and 50Hz, flow indication is stablized
Afterwards, meter records corresponding flow Q30, Q40, Q50；
(2) it sets DCS and controls electric current currently as IDCS(k), then current time DCS shows that flow can be calculated as follows:
(3) cumulant is calculated as follows:
AccQ (K+1)=AccQ (K)+QDCS(k)·TDCS
TDCSFor DCS calculating cycle or sampling period, unit should be scaled hour；
(4) flow is obtained by currently control current detecting, and flow is adjusted by the adjusting to control electric current.
Further, DCS work station obtains current signal as follows: DCS analog output module is by output current value
Monitor workstation is fed back to by data/address bus.
Further, DCS work station obtains current signal as follows: by 4~20mA output of DCS module, DCS mould
The simulation input of quasi- input and digital frequency-variable controller forms series loop, then current value is fed back to monitoring by AD acquisition module
Work station.
Based on industry measurement pump special digital frequency-variable controller, the present invention provides under a kind of DCS environment simultaneously detection and
Flow techniques are adjusted, needs a pair 4~20mA signal cable to connect with DCS, the detection and adjusting of flow can be completed at the same time, thus
Cable and construction cost are saved, high-cost flow instrumentation can be also saved.The industry that the present invention uses current single machine is counted
Amount pump special digital frequency-variable controller is extended to the system-level application field of DCS (Distributed Control System), raw in modernization industry
There is important application value in production system.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of Industrial membranes metering pump；
Each appended drawing reference meaning in figure: 1-threephase asynchronous machine, 2-worm screws, 3-worm gears, 4-cranks, 5-connecting rods,
6-diaphragms, 7-inlet valves, 8-entrance valve balls, 9-each stroke diaphragm chamber volume variation delta V, 10-diaphragm cavities, 11-
Outlet valve, 12-outlet valve balls.
Fig. 2 is that traditional metering pump discharge is adjusted and control method schematic diagram；
Fig. 3 is schematic diagram of the current signal by Data Bus feedback to DCS work station；
Fig. 4 is digital frequency conversion controller and DCS simulation input, exports the schematic diagram that is connected in series.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
At industrial application scene, the purpose of detection flows is typically to control flow, since digital frequency conversion controller will
The Detection & Controling of flow are combined into one, and therefore, for the angle of DCS, can adjust flow by 4~20mA current signal.
For the angle of digital frequency conversion controller, 4~20mA current signal from DCS can be traced, flow is automatically adjusted to phase
The value answered.The present invention is based on this principles to provide a kind of application method of digital frequency conversion controller in dcs, and detailed process is such as
Under:
1. being demarcated according to industry measurement pump digital frequency conversion controller operation manual.
2. after calibration is good, digital frequency conversion controller is set as " fixed frequency " mode, 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 is stablized, meter record is corresponding in the following table flows
Measure Q30, Q40, Q50。
| Frequency/Hz | 30 | 40 | 50 |
| Flow/L/H | Q30 | Q40 | Q50 |
If it is I that DCS, which currently controls electric current,DCS(k), then current time DCS shows that flow can be calculated as follows
Cumulant
AccQ (K+1)=AccQ (K)+QDCS(k)·TDCS,
TDCSFor DCS calculating cycle or sampling period, unit should be scaled hour.
After 4.DCS completes configuration, digital frequency conversion controller is set as " signal " mode before working normally, i.e., traceable 4
~20mA current signal controls flow, detailed process are as follows: flow is obtained by currently controlling electric current, by control electricity
The adjusting of stream adjusts flow.
DCS monitor workstation can obtain one of in the following manner current signal:
1. as shown in figure 3, output current value is fed back to monitor workstation by data/address bus by DCS analog output module.
2. as shown in figure 4, by 4~20mA output of DCS module, the simulation of DCS simulation input and digital frequency-variable controller
Input composition series loop, then current value is fed back into monitor workstation by AD acquisition module.
No matter which kind of scheme is used, since the Detection & Controling function of flow is combined into one by digital frequency conversion controller, because
This, need only a pair of of analog line with regard to achievable flow control and detection, compared with traditional flowmeter+frequency converter scheme,
A pair of of cable rope can be saved, to reduce construction cost.
Claims (3)
1. a kind of method for being detected using digital frequency conversion controller under DCS environment and being adjusted flow, includes the following steps:
(1) working frequency of digital frequency conversion controller is set to 30,40 and 50Hz, after flow indication is stablized, record is corresponding
Flow Q30, Q40, Q50；
(2) it sets DCS and controls electric current currently as IDCS(K), then current time DCS shows that flow can be calculated as follows:
(3) cumulant is calculated as follows:
AccQ (K+1)=AccQ (K)+QDCS(K)·TDCS
TDCSFor DCS calculating cycle or sampling period, unit should be scaled hour；
(4) flow is obtained by currently control current detecting, and flow is adjusted by the adjusting to control electric current.
2. the method for being detected using digital frequency conversion controller under DCS environment according to claim 1 and being adjusted flow, special
Sign is: DCS work station obtains current signal as follows: DCS analog output module is total by data by output current value
Line feeds back to monitor workstation.
3. the method for being detected using digital frequency conversion controller under DCS environment according to claim 1 and being adjusted flow, special
Sign is: DCS work station obtains current signal as follows: by 4~20mA output of DCS module, DCS simulation input sum number
The simulation input of word frequency-variable controller forms series loop, then current value is fed back to monitor workstation by AD acquisition module.
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| 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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| 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 CN106774462A (en) | 2017-05-31 |
| CN106774462B true CN106774462B (en) | 2019-06-21 |
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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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| US20050058548A1 (en) * | 2003-09-11 | 2005-03-17 | U.S. Filter/Stranco Products | Method of controlling fluid flow |
| CN102032167B (en) * | 2010-12-10 | 2012-07-04 | 浙江工业大学 | Flow compensation technology of digital frequency conversion metering pump |
| CN104165137B (en) * | 2014-08-06 | 2016-04-13 | 浙江工业大学 | The convenient demarcation of industry measurement pump special digital frequency-variable controller and autonomous controlling method |
| CN204155153U (en) * | 2014-09-19 | 2015-02-11 | 大唐辽源发电厂 | A kind of motors of metering pumps control system |
| CN205015745U (en) * | 2015-10-10 | 2016-02-03 | 杨晓林 | Add medicine flow closed loop control system based on measuring pump |
| CN105508233A (en) * | 2015-12-09 | 2016-04-20 | 上海电机学院 | Metering pump system capable of measuring and automatically correcting flow rate |
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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 |