CN107783577A - Inlet pumping station perseverance liquid level multistage flow control system - Google Patents
Inlet pumping station perseverance liquid level multistage flow control system Download PDFInfo
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- CN107783577A CN107783577A CN201711310366.9A CN201711310366A CN107783577A CN 107783577 A CN107783577 A CN 107783577A CN 201711310366 A CN201711310366 A CN 201711310366A CN 107783577 A CN107783577 A CN 107783577A
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- Prior art keywords
- liquid level
- flow
- pumping station
- variable
- inlet pumping
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
-
- 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
- G05D7/0623—Control of flow characterised by the use of electric means specially adapted for fluid materials characterised by the set value given to the control element
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D9/00—Level control, e.g. controlling quantity of material stored in vessel
- G05D9/12—Level control, e.g. controlling quantity of material stored in vessel characterised by the use of electric means
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Automation & Control Theory (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The present invention relates to a kind of inlet pumping station perseverance liquid level multistage flow control system, including the soft pump and variable frequency pump being connected with inlet pumping station, soft pump and frequency conversion parallel connection of pumps, it is characterized in that：The parallel connection is soft to open pump and variable frequency pump output channel end connection flow gauge, and data on flows signal is transferred to PLC by the flowmeter by signal cable, and forms the secondary control variable loop of flow；Inlet pumping station is provided with liquid level gauge, and liquid level data signal is transferred to PLC by the liquid level gauge by signal cable, forms actual liquid level with setting the liquid level master variable loop of liquid level difference；The secondary control variable loop of flow collectively forms permanent liquid level multistage flow control system with liquid level master variable loop.Beneficial effect：Single closed-loop system is changed into double loop system by the present invention, while liquid level is ensured, is taken into account the stabilization of flow, is adapted to the flowed fluctuation of the high ebb in industrial park, be remarkably reinforced the anti-interference of inlet pumping station system.
Description
Technical field
The invention belongs to sewage treatment area, more particularly to a kind of inlet pumping station perseverance liquid level multistage flow control system
Background technology
Inlet pumping station effect is that the sewage of Craft in Chemical Industrial Area discharge is promoted into subsequent technique link from inlet pumping station.Work as sewage plant
When inlet pumping station forebay is large-scale regulating reservoir, because pond appearance is sufficiently large, whole Craft in Chemical Industrial Area is influenceed without pit level before consideration is too high
Draining, inlet pumping station opens pump and variable frequency pump is engaged using soft, using constant flux control.When sewage plant cistern is bilge well
When, because pond holds very little, typically using constant liquis position control, when liquid level is more than setting liquid level, frequency conversion pump frequency rises, and works as frequency
When full frequency liquid level still rises, start and new soft open pump or variable frequency pump.When liquid level is less than setting liquid level, frequency conversion pump frequency declines,
When frequency low frequency liquid level continues to decline, stop having been turned on soft opens pump or variable frequency pump.System has the drawback that, whole to intake
System is run according to liquid level, and when causing a large amount of blowdowns in Craft in Chemical Industrial Area, inlet pumping station liquid level rises too fast, and system is keeps permanent liquid
Position, then water pump is largely opened, causes flow excessive；And during a small amount of blowdown in Craft in Chemical Industrial Area, inlet pumping station liquid level decline it is too fast, then largely
Switching off the pump, cause flow too small, subsequent technique is chaotic, to find out its cause, be to be automatically controlled because of traditional using PID frequency modulation,
Single-input single-output, it is liquid level or flow no matter to input, and it is frequency that output is total, is single closed-loop control system.To ensure chemical industry
The proper drainage in area, it is necessary to assure water inlet liquid level can not transfinite, and the design that increase forebay pond can be taken to hold, reduce liquid level
The possibility to transfinite, constant flow is taken to ensure that subsequent technique standard water discharge, or operations staff adjust control flow and ensure liquid level at any time
It can not transfinite, and to be unable to amplitude excessive for flow, influences subsequent technique processing.
The content of the invention
It is an object of the invention to overcome the shortcomings of above-mentioned technology, and provide a kind of inlet pumping station perseverance liquid level multistage flow control
System processed, solves the problems, such as caused flow of inlet water fluctuation during inlet pumping station constant liquis position control.
The present invention to achieve the above object, using following technical scheme：A kind of inlet pumping station perseverance liquid level multistage flow control
System, including the soft pump and variable frequency pump being connected with inlet pumping station, soft pump and frequency conversion parallel connection of pumps, it is characterized in that：The parallel connection
Soft to open pump and variable frequency pump output channel end connection flow gauge, data on flows signal is transferred to by the flowmeter by signal cable
PLC, and form the secondary control variable loop of flow；Inlet pumping station is provided with liquid level gauge, and the liquid level gauge is by signal cable by liquid level
Data signal transmission forms actual liquid level with setting the liquid level master variable loop of liquid level difference to PLC；The secondary control variable of flow
Loop collectively forms permanent liquid level multistage flow control system with liquid level master variable loop.
The liquid level gauge uses ultrasonic level gage, and the flowmeter uses electromagnetic flowmeter.
The setting liquid level in the inlet pumping station actual liquid level tracking master variable loop, according to the loop liquid level of master variable
Poor size progress stepping, gear respectively -4, -3, -2, -1,0 ,+1 ,+2 ,+3 ,+4, nine grades altogether；Each gear calculates pair
The expectation target flow in variable loop is controlled, gear is higher, and target flow is bigger, and target flow and actual flow are carried out into difference ratio
Compared with, by the frequency modulation to frequency converter and water pump start and stop, actual flow is tracked target flow, finally make actual liquid level follow the trail of to
The setting liquid level in master variable loop.
The permanent liquid level multistage flow control system is in two close cycles formula control system, and its outer ring system controlled device is liquid level
Variable, as master variable；Inner ring system controlled device is flow object, as auxiliary variable.
Beneficial effect：Compared with prior art, the present invention compares single single closed-loop control system, and addition flow is as auxiliary
Control parameter is helped, single closed-loop system is changed into double loop system, in the case where not increasing economic investment and expanding forebay pond appearance, to the greatest extent
Possibly reduce because the missing of operations staff's experience or operational error cause production accident.While liquid level is ensured, take into account
The stabilization of flow, the flowed fluctuation of the high ebb in industrial park is adapted to, is remarkably reinforced the anti-interference of inlet pumping station system,
According to liquid level mathematic interpolation, point nine grades of flow stepping water inlets, industrial park flow mutation is it also avoid, causes bilge well liquid level fast
Water pump frequent switching caused by speed rising or rapid decrease.
Brief description of the drawings
Fig. 1 is the connection block diagram of the present invention；
Fig. 2 is the liquid level and flow controlling curve figure of the present invention；
Fig. 3 is level fluctuation drive water pump frequent switching curve synoptic diagram before transformation,；
Fig. 4 is the signal control connection block diagram of the present invention.
Embodiment
Describe the embodiment of the present invention in detail with reference to preferred embodiment.
Refer to accompanying drawing 1, present embodiments provide a kind of inlet pumping station perseverance liquid level multistage flow control system, including with water inlet
The soft pump and variable frequency pump of pump house connection, soft pump and frequency conversion parallel connection of pumps, it is characterized in that：The parallel connection is soft to open pump and variable frequency pump is defeated
Go out pipe end connection flow gauge, data on flows signal is transferred to PLC by the flowmeter by signal cable, and forms flow
Pair control variable loop；Inlet pumping station is provided with liquid level gauge, and liquid level data signal is transferred to by the liquid level gauge by signal cable
PLC, actual liquid level is formed with setting the liquid level master variable loop of liquid level difference；Secondary control variable loop and the liquid level master control of flow
Variable loop collectively forms permanent liquid level multistage flow control system.The liquid level gauge uses ultrasonic level gage, the flowmeter
Using electromagnetic flowmeter.The setting liquid level in the inlet pumping station actual liquid level tracking master variable loop, according to master variable
Loop liquid level difference size progress stepping, gear respectively -4, -3, -2, -1,0 ,+1 ,+2 ,+3 ,+4, nine grades altogether；Each gear
The expectation target flow in secondary control variable loop is calculated, gear is higher, and target flow is bigger, and target flow and actual flow are entered
Row difference comparsion, by the frequency modulation to frequency converter and water pump start and stop, actual flow is tracked target flow, finally make actual liquid
Follow the trail of to the setting liquid level in master variable loop position.
The setting liquid level in inlet pumping station actual liquid level tracking master variable loop is big according to the loop liquid level difference of master variable
Small carry out stepping, nine grades altogether；Each gear calculates the expectation target flow in secondary control variable loop, by target flow and reality
Flow carries out difference comparsion, by the frequency modulation to frequency converter and water pump start and stop, actual flow is tracked target flow, finally makes
Actual liquid level is followed the trail of to the setting liquid level in master variable loop.I.e. same setting liquid level, according to the change of liquid level difference, step-by-step movement 9
Shelves flow increase and decrease, setting liquid level is reached to actual liquid level.
The permanent liquid level multistage flow control system is in two close cycles formula control system, and its outer ring system controlled device is liquid level
Variable, as master variable；Inner ring system controlled device is flow object, as auxiliary variable.
Hardware structure:Executing agency's (three soft pumps, two variable frequency pumps and corresponding attached frequency converter and soft initiator),
Controller (S7-300PLC, computer), ultrasonic level gage, electromagnetic flowmeter.
The course of work
Accompanying drawing 4 is referred to, permanent liquid level multistage flow of the invention control feature is：Master variable is Liquid level, and pair control becomes
Measure and controlled for flow, form permanent liquid level multistage flow control system.Actual liquid level is calculated by the feedback of ultrasonic level gage
Difference with setting liquid level, calculates target flow using liquid level difference, actual stream is calculated by the feedback of electromagnetic flowmeter
Amount and the difference of target flow, the start and stop of the frequency modulation of variable frequency pump or progress intake pump are carried out according to target flow difference.
Case history
1. controller architecture：
Slave computer：Siemens's programmable logic device s7-300 series of PLC controls as inlet pumping station perseverance liquid level multistage flow
The controller of program.
Host computer：Windows xp component computers, mounting industrial configuration software intouch operate boundary as staff
Face.
2. systematic parameter
A. man-machine interface opens parameter (be able to can be adjusted according to operating mode operations staff)
Stable liquid level：The setting value in master variable liquid level loop, the tracking liquid level of final actual liquid level.
Regime flow：The setting value of secondary variable flow circuit, the flow value of benchmark, target flow increase and decrease on this basis,
When actual liquid level reaches stable liquid level, target flow is equal to regime flow.
Stepping flow：The flow volume change values of gear change, the changing value of different shelves target flows.
B.PLC programs inner parameter (defined operations staff can not change inside program)
Stepping liquid level：Application definition is 0.25m, and the liquid level changing value of gear change, actual liquid level is with stablizing liquid level difference value
Absolute value when being more than or equal to stepping liquid level, gear change, stepping gear is when actual liquid level and stablizes the absolute value of liquid level difference value
More than stepping liquid level integral multiple when, the difference of target flow and regime flow is the integral multiple of stepping flow.
Stepping gear：The gear of target flow is adjusted, actual liquid level is calculated and stablizes liquid level difference value, corresponding corresponding stepping shelves
Position, target flow is with the change respective change of stepping gear.Divide nine grades altogether.
● actual liquid level-stabilization liquid level<During=- 1m
(actual liquid level-stabilization liquid level)/stepping liquid level<=-4 stepping gear=- 4 grade
●-1m<Actual liquid level-stabilization liquid level<During=- 0.75m
-4<(actual liquid level-stabilization liquid level)/stepping liquid level<=-3 stepping gear=- 3 grade
●-0.75m<Actual liquid level-stabilization liquid level<During=- 0.5m
-3<(actual liquid level-stabilization liquid level)/stepping liquid level<=-2 stepping gear=- 2 grade
●-0.5m<Actual liquid level-stabilization liquid level<During=- 0.25m
-2<(actual liquid level-stabilization liquid level)/stepping liquid level<=-1 stepping gear=- 1 grade
●-0.25m<Actual liquid level-stabilization liquid level<During 0.25m
-1<(actual liquid level-stabilization liquid level)/stepping liquid level<1 stepping gear=0 grade
●0.25m<=actual liquid level-stabilization liquid level<During 0.5m
1<=(actual liquid level-stabilization liquid level)/stepping liquid level<2 stepping gear=1 grade
●0.5m<=actual liquid level-stabilization liquid level<During 0.75m
2<=(actual liquid level-stabilization liquid level)/stepping liquid level<3 stepping gear=2 grade
●0.75m<=actual liquid level-stabilization liquid level<During 1m
3<=(actual liquid level-stabilization liquid level)/stepping liquid level<4 stepping gear=3 grade
●1m<During=actual liquid level-stabilization liquid level
4<=(actual liquid level-stabilization liquid level)/stepping liquid level stepping gear=4 grade
Target flow：Feed water flow value under currently practical level value, target flow=regime flow+stepping gear x steps
Enter flow.
Dead band flow：Application definition is 15m3/h, the flow value for avoiding system from frequently adjusting, when actual flow and target stream
When the absolute value of amount difference is less than dead band flow, system does not carry out system call interception to flow feedback, i.e., does not increase and decrease frequency, not start and stop
Water pump.
Dead band liquid level：Application definition is 0.05m, the level value for avoiding system from frequently adjusting, when the change width of actual liquid level
When degree is less than dead band liquid level, system does not change without gear change, i.e. target flow.
3. control flow：The stable liquid level set according to operations staff, inlet pumping station actual liquid level subtracts each other therewith draws liquid
Potential difference, stepping gear is calculated according to the integral multiple relation of liquid level difference and stepping liquid level, in the regime flow that operations staff is set
On the basis of, target flow is calculated according to stepping gear and stepping flowmeter, according to the difference of target flow and actual flow come
Carry out the frequency modulation of variable frequency pump or carry out the start and stop of intake pump.
5. explanation of nouns：
Actual liquid level：Inlet pumping station level gauge is fed to PLC liquid level numerical value.
Man-machine interface：The screen picture of computer of operator's operation.
6. practical examples
Staff sets stable liquid level as 6.5 meters, regime flow 1200m3/h, stepping flow 75m3/h.Procedure operation mould
Formula is as shown in the table.
7. liquid level of flux chart before and after transformation
Accompanying drawing 2 is referred to, abscissa is the time, and span is 1 day, and ordinate is flow, and B is flow curve, and A is that liquid level is bent
Line, full scale 6000m3/h.B curve step-by-step movement increments when water inlet liquid level is uprushed as shown in the figure.
The present invention can be substantially it can be seen that the step variation of B curve flows to liquid level and the curve of flow control.
Accompanying drawing 3 is referred to, B is flow curve, and A is level curve, and C is intake pump start and stop curve, and abscissa is the time, across
Spend for 1 day, ordinate is flow, and full scale 6000m3/h, when liquid level of intaking as shown in the figure frequently changes, flow curve is frequent
Change, intake pump frequent starting.Level fluctuation before transformation drives water pump frequent switching, causes the flow of whole production line unstable
It is fixed.
Accompanying drawing 2 and the picture that accompanying drawing 3 is live SCADA system chart interception, take some day before and after transformation
As a comparison.
The above-mentioned detailed description carried out with reference to embodiment to a kind of inlet pumping station perseverance liquid level multistage flow control system, it is
It is illustrative rather than limited, several embodiments can be included according to limited scope, therefore do not departing from the present invention
Changing and modifications under general plotting, it should belong within protection scope of the present invention.
Claims (4)
1. a kind of inlet pumping station perseverance liquid level multistage flow control system, including the soft pump and variable frequency pump being connected with inlet pumping station,
Soft pump and frequency conversion parallel connection of pumps, it is characterized in that：The parallel connection is soft to open pump and variable frequency pump output channel end connection flow gauge, the stream
Data on flows signal is transferred to PLC by gauge by signal cable, and forms the secondary control variable loop of flow；Inlet pumping station is provided with
Liquid level data signal is transferred to PLC by liquid level gauge, the liquid level gauge by signal cable, forms actual liquid level and setting liquid level difference
The liquid level master variable loop of value；The secondary control variable loop of flow collectively forms permanent liquid level multilevel flow with liquid level master variable loop
Amount control system.
2. inlet pumping station perseverance liquid level multistage flow control system according to claim 1, it is characterized in that：The liquid level gauge is adopted
With ultrasonic level gage, the flowmeter uses electromagnetic flowmeter.
3. inlet pumping station perseverance liquid level multistage flow control system according to claim 1, it is characterized in that：The inlet pumping station
The setting liquid level in actual liquid level tracking master variable loop, stepping, gear are carried out according to the loop liquid level difference size of master variable
Respectively -4, -3, -2, -1,0 ,+1 ,+2 ,+3 ,+4, nine grades altogether；Each gear calculates the target stream in secondary control variable loop
Amount, target flow and actual flow are subjected to difference comparsion, by the frequency modulation to frequency converter and water pump start and stop, chase after actual flow
Track finally makes actual liquid level follow the trail of to the setting liquid level in master variable loop to target flow.
4. inlet pumping station perseverance liquid level multistage flow control system according to claim 1, it is characterized in that：The permanent liquid level is more
Level flow control system is in two close cycles formula control system, and its outer ring system controlled device is liquid level variable, as master variable；It is interior
Loop system controlled device is flow object, as auxiliary variable.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310366.9A CN107783577A (en) | 2017-12-11 | 2017-12-11 | Inlet pumping station perseverance liquid level multistage flow control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711310366.9A CN107783577A (en) | 2017-12-11 | 2017-12-11 | Inlet pumping station perseverance liquid level multistage flow control system |
Publications (1)
| Publication Number | Publication Date |
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| CN107783577A true CN107783577A (en) | 2018-03-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711310366.9A Pending CN107783577A (en) | 2017-12-11 | 2017-12-11 | Inlet pumping station perseverance liquid level multistage flow control system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030300A (en) * | 2018-08-01 | 2018-12-18 | 广州海洋地质调查局 | A kind of pit shaft and pipeline small particle sand sedimentation experiment device and method |
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| FR2837244A1 (en) * | 2002-03-14 | 2003-09-19 | Implantation Et De Diffusion D | Pump, for a drainage system, is controlled according to the liquid flows to ensure that there is no dry running |
| CN202472441U (en) * | 2012-01-16 | 2012-10-03 | 广东理文造纸有限公司 | Control system for discharging sewage to sea |
| CN106759834A (en) * | 2016-12-13 | 2017-05-31 | 清华大学 | A kind of sewage pumping station dynamic control method and system |
| CN206457881U (en) * | 2016-12-23 | 2017-09-01 | 上海上电机电设备工程有限公司 | Full factory water supply pumping plant robot control system(RCS) |
| CN207586777U (en) * | 2017-12-11 | 2018-07-06 | 天津泰达新水源科技开发有限公司 | Inlet pumping station perseverance liquid level multistage volume control device |
-
2017
- 2017-12-11 CN CN201711310366.9A patent/CN107783577A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2837244A1 (en) * | 2002-03-14 | 2003-09-19 | Implantation Et De Diffusion D | Pump, for a drainage system, is controlled according to the liquid flows to ensure that there is no dry running |
| CN202472441U (en) * | 2012-01-16 | 2012-10-03 | 广东理文造纸有限公司 | Control system for discharging sewage to sea |
| CN106759834A (en) * | 2016-12-13 | 2017-05-31 | 清华大学 | A kind of sewage pumping station dynamic control method and system |
| CN206457881U (en) * | 2016-12-23 | 2017-09-01 | 上海上电机电设备工程有限公司 | Full factory water supply pumping plant robot control system(RCS) |
| CN207586777U (en) * | 2017-12-11 | 2018-07-06 | 天津泰达新水源科技开发有限公司 | Inlet pumping station perseverance liquid level multistage volume control device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109030300A (en) * | 2018-08-01 | 2018-12-18 | 广州海洋地质调查局 | A kind of pit shaft and pipeline small particle sand sedimentation experiment device and method |
| CN109030300B (en) * | 2018-08-01 | 2024-01-16 | 广州海洋地质调查局 | Shaft and pipeline small-particle-size sand deposition experimental device and method |
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