CN106774462B - The method of using digital frequency conversion controller to detect and adjust flow in DCS environment - Google Patents

The method of using digital frequency conversion controller to detect and adjust flow in DCS environment Download PDF

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Publication number
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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dcs
flow
frequency conversion
digital frequency
conversion controller
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CN106774462A (en
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余世明
王林峰
陶柳青
王申建
李康康
贾鑫康
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Zhejiang University of Technology ZJUT
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Zhejiang University of Technology ZJUT
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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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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Feedback Control In General (AREA)

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

The method for detecting using digital frequency conversion controller under DCS environment and adjusting flow
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)

1.一种DCS环境下采用数字变频控制器检测和调节流量的方法，包括如下步骤：1. A method for detecting and regulating flow using a digital frequency conversion controller in a DCS environment, comprising the steps: (1)将数字变频控制器的工作频率分别设为30，40及50Hz，流量显示稳定后，记录 相应的流量Q30，Q40，Q50；(1) Set the operating frequencies of the digital frequency conversion controller to 30, 40 and 50 Hz respectively, and after the flow rate display is stable, record the corresponding flow rates Q 30 , Q 40 , and Q 50 ; (2)设DCS当前控制电流为IDCS(K)，则当前时刻DCS显示流量可按下式计算：(2) Assuming that the current control current of DCS is I DCS (K), the flow displayed by DCS at the current moment can be calculated as follows: (3)累积量按下式计算：(3) The cumulative amount is calculated as follows: AccQ(K+1)＝AccQ(K)+QDCS(K)·TDCS AccQ(K+1)=AccQ(K)+Q DCS (K) T DCS TDCS为DCS计算周期或采样周期，单位应换算为小时；T DCS is the calculation period or sampling period of DCS, and the unit should be converted into hours; (4)通过当前控制电流检测获得流量，并通过对控制电流的调节来调节流量。(4) The flow is obtained by detecting the current control current, and the flow is adjusted by adjusting the control current. 2.根据权利要求1所述的DCS环境下采用数字变频控制器检测和调节流量的方法，其特征在于：DCS工作站按如下方式获得电流信号：DCS模拟输出模块将输出电流值通过数据总线反馈给监控工作站。2. adopt the method for digital frequency conversion controller to detect and regulate flow under the DCS environment according to claim 1, it is characterized in that: DCS workstation obtains current signal as follows: DCS analog output module feeds back the output current value through data bus to Monitoring workstations. 3.根据权利要求1所述的DCS环境下采用数字变频控制器检测和调节流量的方法，其特征在于：DCS工作站按如下方式获得电流信号：将DCS模块的4～20mA输出、DCS模拟输入和数字变频控制器的模拟输入组成串联回路，再由AD采集模块将电流值反馈给监控工作站。3. the method that adopts digital frequency conversion controller to detect and regulate flow under the DCS environment according to claim 1 is characterized in that: DCS workstation obtains current signal as follows: 4～20mA output of DCS module, DCS analog input and The analog input of the digital frequency conversion controller forms a series loop, and then the AD acquisition module feeds back the current value to the monitoring workstation.
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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
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Application publication date: 20170531

Assignee: Shandong precision product quality inspection Co.,Ltd.

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Denomination of invention: The Method of Using Digital Frequency Conversion Controller to Detect and Adjust Flow in DCS Environment

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