EP3048305A1 - Réduction de la consommation d'énergie d'une pompe à eau à vitesse variable en tenant compte de la charge instantannée du système - Google Patents

Réduction de la consommation d'énergie d'une pompe à eau à vitesse variable en tenant compte de la charge instantannée du système Download PDF

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Publication number
EP3048305A1
EP3048305A1 EP16000069.1A EP16000069A EP3048305A1 EP 3048305 A1 EP3048305 A1 EP 3048305A1 EP 16000069 A EP16000069 A EP 16000069A EP 3048305 A1 EP3048305 A1 EP 3048305A1
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EP
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Prior art keywords
flow rate
pump
feed pump
characteristic
curve
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EP16000069.1A
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German (de)
English (en)
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EP3048305B1 (fr
Inventor
Jens-Christian Magnussen
Jörg Bülow
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Magnussen Emsr Technik GmbH
Magnussen Emsr-Technik GmbH
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Magnussen Emsr Technik GmbH
Magnussen Emsr-Technik GmbH
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Priority claimed from DE102015000373.9A external-priority patent/DE102015000373A1/de
Priority claimed from DE102015011487.5A external-priority patent/DE102015011487A1/de
Application filed by Magnussen Emsr Technik GmbH, Magnussen Emsr-Technik GmbH filed Critical Magnussen Emsr Technik GmbH
Publication of EP3048305A1 publication Critical patent/EP3048305A1/fr
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
    • F04D15/0088—Testing machines
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03B—INSTALLATIONS OR METHODS FOR OBTAINING, COLLECTING, OR DISTRIBUTING WATER
    • E03B5/00—Use of pumping plants or installations; Layouts thereof

Definitions

  • the invention relates to a method for reducing the energy consumption of a feed pump according to the preamble of claim 1 and a system for conveying water from at least one well into a pipe network according to the preamble of claim 12.
  • Processes and plants of the type mentioned are mainly used in water works to promote drinking water wells in a water supply network, but can also be used in industrial plants that require large amounts of fresh water.
  • the feed pumps are usually electric centrifugal pumps, which are used as submersible pumps within the well.
  • the feed pumps are located either directly on the mains or are equipped with a frequency converter with which the drive speed of the feed pump is regulated according to a set flow rate.
  • the present invention seeks to improve a method and a system of the type mentioned in that the feed pump works as close to or at its lowest energy operating point.
  • the inventive solution allows even in more complex wells, individually and independently of the other feed pumps to determine the most energetically favorable operating point at a given time and then adjust this operating point by changing the drive speed of each feed pump to the energy consumption of each pump individually Minimize delivery pump separately.
  • the feed pump is preferably an electric feed pump equipped with a frequency converter whose drive speed is controlled or regulated by the frequency converter by changing or adjusting the frequency of the alternating current applied to the drive motor of the feed pump and thus the drive speed of the feed pump.
  • the target flow rate of the lowest energy operating point is transmitted to the control or regulating unit, which compares the target flow rate with a measured actual flow rate and generates a control value for the frequency from the difference of the two flow rates.
  • the frequency converter then changes the frequency of the alternating current until the actual flow rate corresponds to the set flow rate.
  • the operating point with the lowest specific power or energy requirement is that operating point of the feed pump in which a characteristic of the specific power or energy demand of the feed pump, preferably including the drive motor, a serving for controlling the feed pump and a power supply to Drive motor serving power line has a minimum.
  • the flow rate that is delivered from the feed pump to the pipe or pipe network at the minimum of the specific power or energy demand is the flow Q1.
  • a preferred embodiment of the invention provides that for determining the operating point with the lowest specific power or energy consumption of the feed pump, a characteristic curve is calculated which indicates the respective specific power or energy requirements of the feed pump in dependence on the dynamic system characteristic curve, which in turn from the Geodetic height, the lowering of the water level in the well and line losses in the line or in the mains network is calculated.
  • the minimum of this calculated characteristic represents the operating point with the lowest specific power or energy requirement.
  • the characteristic curve of the specific power or energy demand of the feed pump, the pump efficiency curve and the dynamic system characteristic in a usual for marking feed pumps in wells diagram or coordinate system are shown in which the abscissa, the flow or flow rate of the feed pump and on Ordinate the delivery height of the feed pump are applied, the former expediently in m 3 / h and the latter is expediently in mWS (meter water column) is given.
  • the specific power or energy demand curve indicates the quantity or volume of power or energy required to extract one m 3 of water from the well into the pipeline or pipeline, which is expediently expressed in kWh per m 3 .
  • This curve is a curve that drops to the minimum with increasing flow in the manner of a relatively steep parabola and then rises again in the form of a relatively flat parabola.
  • efficiency curve pump efficiency curve is a "static" characteristic that indicates a certain efficiency of the feed pump as a function of the flow rate at the output of the feed pump and the delivery head.
  • the pump efficiency curve is an increasing with increasing flow or flow rate and increasing head, the slope of which increases with increasing flow or flow rate and increasing head.
  • the pump efficiency characteristic is preferably the efficiency curve for the maximum efficiency of the feed pump, which is usually in the range of about 70 to 80 percent in feed pumps for wells, such as centrifugal pumps, so that the most energetically favorable operating point can be set can.
  • On both sides of the preferred efficiency curve are each pairs of efficiency characteristics, in which the pump operates with the same but lower efficiency.
  • the dynamic system characteristic represents the resistance of the line or the pipeline network at a certain delivery or flow rate at the output of the feed pump.
  • the dynamic system curve is also a curved, rising with increasing delivery or flow rate and increasing head, but is flatter than the pump efficiency curve and cut them.
  • the method according to the invention is preferably implemented by suitable software which is accessed by the control unit.
  • delivery pump performance characteristics are mostly provided by the suppliers of drawn pumps, which can not be directly processed by the software
  • the desired pump efficiency curve is converted from the corresponding drawn pump efficiency curve of the manufacturer to an electronic form obtained by software evaluate or process.
  • the pump efficiency curve of the manufacturer preferably from the pump efficiency curve for the maximum efficiency, value pairs extracted and converted by means of a polynomial regression (polynomial regression) in a usable for the calculation and display electronic form.
  • polynomial regression polynomial regression
  • an overall efficiency curve is calculated to calculate the characteristic of the specific power or energy demand, indicating or reproducing the overall efficiency of the feed pump including the drive motor, the frequency converter and the power line as a function of the current system characteristic.
  • the respective total power is calculated for each flow rate or for a plurality of incremental flow rate support points.
  • the respective total power only needs to be divided by the respectively associated flow rate in order to obtain the characteristic curve or a plurality of incremental interpolation points of the characteristic curve.
  • the calculation of the overall efficiency characteristic curve is preferably carried out in several steps, wherein in a first step pump characteristics for a number of other frequencies or speeds are derived from a pump characteristic curve usually provided by the manufacturer of the feed pump for the maximum frequency or speed.
  • pump characteristics of the feed pump are determined for about five to ten different frequencies. These frequencies suitably include the maximum frequency applied by the frequency converter to the drive motor and a number of other frequencies at predetermined frequency intervals between the maximum frequency and the lowest frequency adjustable by the frequency at which the delivery pump is still allowed to operate.
  • the maximum frequency is 100 Hz
  • the lowest frequency is about 65 Hz.
  • intersection points of the current system characteristic curve are then calculated with the pump characteristic curves calculated in the first step, and the associated flow rate is determined for each of these intersection points.
  • pump efficiency curves for a number of other frequencies or speeds are derived from a maximum efficiency or speed pump efficiency curve typically provided by the pump manufacturer, as previously described for the pump characteristic.
  • the pump efficiency ⁇ at each frequency is determined from each of the flow rates determined in the second step and from the associated pump efficiency curve determined in the third step.
  • a pump efficiency curve becomes the current one Plant characteristic calculated. This calculation is preferably carried out by polynomial regression (polynomial regression).
  • a current overall efficiency curve which is also dependent on the system characteristic curve, is then calculated in a sixth step, into which efficiency characteristics of the electric drive motor, the frequency converter and, if appropriate, the power line are preferably included in addition to the pump efficiency characteristic.
  • the calculation of the overall efficiency characteristic is carried out by multiplying the pump efficiency characteristic with the other efficiency characteristics to be considered.
  • the efficiency characteristics of the electric drive motor of the feed pump, the frequency converter and the power line for supplying power to the drive motor are usually available from the manufacturers of these components, so they need not be calculated.
  • the derived from the plant characteristic curve or dependent on the plant characteristic curves, such as the overall efficiency curve and the characteristic of the specific power or energy demand are constantly recalculated as the plant characteristic, preferably at short intervals and / or whenever the system characteristic changes , This is the case, for example, when the lowering of the water level in the well or line losses in the pipeline or pipeline network change.
  • the determination of the dynamic system characteristic from the geodetic height, the lowering of the water level in the well and the pipe losses in the pipe network is preferably carried out by the characteristics of these variables are electronically added in the above diagram or coordinate system by the software used.
  • the system characteristic curve is a "dynamic" characteristic, which includes the calculation of the constant geodetic height as well as a “dynamic” characteristic of the lowering of the water level in the well and a “dynamic” characteristic of the line losses in the line network. From the plant characteristic curve it can be deduced, which resistance the pipeline network of the pump at a certain delivery or Flow rate, which in turn can be calculated, which pressure is necessary to promote the specific flow or flow through the pipe network. From the current system characteristic curve it can be seen which resistance the pump's line network opposes with the current delivery or flow rate.
  • the geodetic height is the height difference between the highest point of the pipeline network, in which promotes the feed pump, and the water level in the well from which promotes the feed pump.
  • the calm water level is the water level that sets in the well when no water is pumped out of the well.
  • the geodetic height is a constant value that is independent of the flow or flow rate.
  • the characteristic curve of the geodesic height which is also referred to simply as the geodetic characteristic curve, is therefore a straight line running parallel to the abscissa.
  • the characteristic curve of the lowering of the water level in the well is a "dynamic" characteristic which is determined for each well during normal or controlled operation of the feed pump by stepwise or preferably continuous measurements.
  • the actual water level in the well is determined, for example, by means of a pressure gauge at the bottom of the well or at the level of the submersible pump and subtracted from the calm water level.
  • the "dynamic" characteristic shows the course of the lowering of the water level as a function of the delivery or flow rate and the delivery height of the feed pump.
  • the lowering of the water level in the well is dependent on the flow or flow rate characteristic curve, which usually increases linearly with the flow or flow rate.
  • the line losses of the line network are derived for each pump from the prevailing at the output of the pump pressure, which is determined stepwise or preferably continuously during the normal or regular operation of the pump.
  • a line characteristic curve of the line losses is a "dynamic" curve, which is a curved curve in the above diagram or coordinate system, which increases with increasing delivery or flow rate and with increasing head, the slope increases.
  • the line losses of the network usually increase in square of the flow or flow rate.
  • the pressure in the line is preferably measured before the first branching of the line network behind the feed pump.
  • the height level, in which the pressure in the pipeline network is measured flows into the calculation, if the pressure is not measured directly at the outlet of the feed pump, but for example at the wellhead, which is located at submersible pumps at a higher level than the output of the pump ,
  • the measurement of the pressure at the well head is preferred because the line has not yet branched there and because the measurement of the pressure there is easier than inside the well at the output of the feed pump.
  • the dynamic determination of the subsidence according to the invention also makes it possible to detect a blockage of the well.
  • a blockage in which not enough water can flow into the wells, is usually noticeable in that during operation of the feed pump does not set after some time a constant flow water level at which the delivery or flow rate of the feed pump and the Inflow into the well keep the balance, but that the water level drops further and further.
  • the pressure and the delivery or flow rate at the outlet of the pump are determined for each delivery pump.
  • the delivery or flow rate need not be measured directly at the outlet of the delivery pump. Instead, the measurement can be anywhere before the first one Branching of the line done and preferably takes place at the wellhead.
  • the measurement of the delivery or flow rate is preferably carried out by means of an inductive measuring device and takes place according to a further advantageous embodiment of the invention as the measurement of the lowering of the water level and the pressure stepwise or preferably continuously.
  • a further preferred embodiment of the invention provides that displayed on a screen, the characteristic of the specific power or energy demand of the feed pump, the pump efficiency curve, the current system characteristic and a pump curve for the current input speed of the feed pump and.
  • the pump characteristic curve is a "dynamic" characteristic which, for a specific drive speed or frequency of the feed pump in the above-mentioned diagram or coordinate system, shows its operating points in the form of a delivery or flow rate of the feed pump as a function of the delivery height.
  • the pump curves are in the above-mentioned diagram or coordinate system curved, decreasing with increasing flow or flow rate and increasing head, curves, the slope of which increases usually with increasing flow or flow rate and increasing head.
  • the pump characteristics are converted into electronic form by extracting pairs of values and polynomial regression from drawn diagrams of the manufacturers so that they can be displayed on the screen by means of the software. The representation is made for the respective drive speed of the feed pump, so that the associated frequency is needed.
  • the screen also expediently displays the minimum of the characteristic of the specific power or energy requirement as well as the point of intersection of the pump characteristic with the instantaneous system characteristic and the intersection of the pump efficiency characteristic with the instantaneous system characteristic.
  • the flow Q1 can be read, in which the specific power or energy consumption of the feed pump is the lowest.
  • the Flow Q2 can be read.
  • the on-screen operator can immediately compare whether the flow rate at the minimum of the specific power or energy demand curve or that at the intersection of the pump efficiency curve with the system characteristic is greater or less, thereafter one of the alternatives mentioned above under 2) and 3) to choose.
  • the actual operating point calculated from the intersection of the pump characteristic curve with the system characteristic curve, the desired operating point point calculated from the intersection of the pump efficiency curve with the system curve and the operating point with the lowest specific power or energy requirement of the feed pump are each output in the form of a delivery or flow rate , wherein the former represent the actual flow or flow rate and the latter energetically favorable target flow or flow rates.
  • One of these desired delivery or flow rates is fed to the control unit, as previously described, which generates a control value for the frequency converter.
  • the system characteristic of each pump usually changes, for example, when the water level in the associated wells drops or the line losses in the network change or wells with multiple wells one or more feed pumps are switched on or off.
  • the change in the system characteristic causes a shift in the system characteristic in the above-mentioned diagram or coordinate system. This also results in a different characteristic of the specific power or energy requirement as well as new intersections of the system characteristic with the pump efficiency characteristic.
  • the control or regulation unit determines the new minimum of the characteristic curve of the specific power or energy requirement and the new points of intersection and displays them on the screen.
  • either the minimum of the characteristic of the specific power or energy demand or the intersection of the high-efficiency pump efficiency curve and the system characteristic acts as a reference in the control of the feed pump, the energy saving potential being that the instantaneous actual flow rate expressed as the actual flow rate Operating point of the feed pump this minimum or intersection is tracked.
  • Well system 10 shown essentially consists of a single drinking water well 12 and a well pump 12 installed in the pump 14, which pumps drinking water from the well 12 through a line 18 into a reservoir 16.
  • the pump 14 is a submersible pump, which is submerged within the well 12 in the water and designed, for example, as a centrifugal pump with an electric drive motor 15.
  • the reservoir 16 may be, for example, a high reservoir or a Verdüsung.
  • the well system 10 further comprises means 20 for continuously determining the lowering of the water level in the well 12, a fountain head 22 arranged Pressure gauge 24 for continuously measuring the water pressure in the line 18 behind the pump 14 and also arranged on the wellhead 22 flow rate meter 26 for continuously measuring the delivery or flow rate of the pump 14th
  • the means 20 comprise a pressure gauge 28, which is arranged approximately at the level of the pump 14 in the well 12 and continuously detects the hydrostatic pressure of the water column above the pressure gauge 28.
  • Fig. 1 represented by a hatched area
  • the height of the water column in the well between a water level H 0 which occurs when the pump 14 for a long time does not deliver water from the well 12
  • an operating water level H 1 which is in operation of the feed pump 14th when the amount of water delivered by the pump 14 and the flow of water from the environment into the wells 12 are balanced.
  • the respective lowering of the water level H Abs ( Fig. 1 ), which corresponds to the height difference ⁇ H between the still water level H 0 and the instantaneous actual water level H Ist and is generally between the two values H 0 and H 1 .
  • the well system 10 includes a control and regulation unit 30 for controlling and regulating the drive speed of the feed pump 14.
  • the control unit 30 is connected by signal lines 32 with the measuring devices 24, 26 and the means 20.
  • the control unit 30 communicates on the one hand with a computer 34 of a control room 36 of the well system 10 and on the other hand with a frequency converter 38 which is connected by a power line 40 to the drive motor 15 of the feed pump 14.
  • the computer 34 includes a screen 42, on the characteristics of the well system 10 and the feed pump 14 and the result of the control and regulation of the drive speed for visual inspection can be displayed.
  • the frequency converter 38 By means of the frequency converter 38, the frequency of the drive motor 15 of the pump 14 applied alternating voltage can be changed and thus the drive speed of the pump 14 can be changed continuously from the minimum speed specified by the manufacturer to the rated speed without the drive torque drops.
  • the arranged at the well head 22 pressure gauge 24 measures the water pressure in the line 18 at the level of the well head 22.
  • the measured water pressure in the line 18 is transmitted via the control unit 30 to the computer 34, where the measured Pressure and the hydrostatic pressure of the water column between the output of the feed pump 14 and the measuring point at the wellhead 22 are added to calculate the pressure at the outlet of the feed pump 14.
  • the line losses in the line 18 are in a defined relationship to the pressure at the outlet of the feed pump 14 and can be calculated by the computer 34 from the pressure measured by the pressure gauge 24.
  • the flow rate measuring device 26 is an inductive measuring device, from which the measured delivery or flow rate in the line to the control and regulation unit 30 and to the computer 34 is transmitted. Since the line 18 does not branch in front of the well head 22, the measured delivery or flow rate corresponds to the delivery or flow rate at the outlet of the pump 14.
  • the pressure of the water column measured by the pressure gauge 28 is transmitted to the control unit and from there to the computer, which calculates the lowering of the water level H Abs from the measured pressure.
  • the geodetic height H geod is still required, ie the height difference between the still water level H 0 and the highest point of the riser, as in Fig. 1 shown.
  • the computer 34 generates from the geodetic height H geod , the instantaneous reduction of the water level H Abs and the current pressure at the output of the feed pump 14 each have a characteristic of these variables.
  • Fig. 3 represented in a diagram or coordinate system in which the abscissa indicates the delivery or flow rate of the feed pump in m 3 / h and the ordinate the delivery height of the feed pump 14 in mWS.
  • the characteristic is a straight line parallel to the abscissa, which in Fig. 3 is shown by a dotted line A.
  • the characteristic of the lowering of the water level is also a straight line, but increases in proportion to the delivery or flow rate of the feed pump 14, as in Fig. 3 represented by a broken line B.
  • the characteristic of the line losses is a curved curve which increases due to the increasing line resistance in accordance with the square of the delivery or flow rate, as in FIG Fig. 3 represented by a dash-dotted line C.
  • the system characteristic D is a dynamic characteristic which shifts with each change in the pressure at the outlet of the pump 14 and any change in the lowering of the water level in the diagram.
  • a maximum efficiency pump efficiency curve and a pump characteristic are stored for the same diagram or coordinate system, of which the former is a parabolic rising curve, as in FIG Fig. 4 represented by a broken line E, and the latter is a sloping curved curve, as in Fig. 4 represented by a dotted line F.
  • E and F shows Fig. 4 also the plant characteristic D.
  • the pump efficiency curve E is a static characteristic which indicates the maximum efficiency of the pump 14 as a function of the delivery or flow rate and of the delivery head. For example, in a feed pump 14 designed as a centrifugal pump, the maximum efficiency is about 72 to 78%.
  • the pump characteristic curve F is a dynamic characteristic curve which, for a specific frequency or drive speed of the feed pump 14, shows its operating points in the form of a delivery or flow rate as a function of the delivery head.
  • Fig. 4 is shown schematically for a manufacturer-pump characteristic G for the maximum frequency or drive speed, this is done by extracting a set of value pairs X from the drawn characteristic and then a curve is generated by polynomial regression, which is processed by the software implemented in the computer 34 and can be displayed on screen 42 and in Fig. 4 is shown as a dotted line G.
  • the polynomial regression mentioned is a known method, which therefore need not be described in detail here.
  • the computer In order to operate the feed pump 14 always in an energetically most favorable operating point, the computer continuously calculates the intersections S1 and S2 of the instantaneous system characteristic D with the pump characteristic F for the instantaneous drive speed or frequency and with the pump efficiency curve E for the maximum efficiency.
  • the intersection S1 in Fig. 4 and 5 represents the instantaneous operating point of the pump 14, while the point of intersection S2 in Fig. 4 and 5 represents an energetically favorable operating point.
  • the computer 34 continuously calculates a characteristic curve, the respective specific power or energy requirements of the feed pump 14 including its drive motor 15, its frequency converter 38 and its power line 40 depending on the delivery or flow rate at the output of the feed pump 14 and of the delivery indicates.
  • the minimum of this characteristic represents the operating point with the lowest specific power or energy requirement. This characteristic is in Fig. 7 represented by the curve J.
  • the characteristic J is calculated by the computer 34 in several steps:
  • a set of value pairs X is extracted from a drawn manufacturer pump characteristic curve for a maximum pump frequency of 100 Hz, and then a polynomial regression generates a curve G100 which can be processed by the software implemented in computer 34 and displayed on screen 42. From this curve G100 in Fig. 8 Then further pump characteristics G95, G90, G85, G80, G75, G70 and G65 are derived for lower frequencies of 95 Hz, 90 Hz, 85 Hz, 80 Hz, 75 Hz, 70 Hz and 65 Hz, as in Fig. 8 shown. The frequencies mentioned are only examples. Other frequencies may be used.
  • the intersections S100, S95, S90, S85, S80, S75, S70 and S65 of the current system characteristic D are calculated with the pump characteristics G100, G95, G90, G85, G80, G75, G70 and G65 and for each of these intersections S100, S95, S90, S85, S80, S75, S70 and S65 determines the associated flow rate Q100, Q95, Q90, Q85, Q80, Q75, Q70 and Q65 which are on the abscissa below the respective intersection S100, S95, S90, S85 , S80, S75, S70 and S65 can be read.
  • a set of value pairs X is extracted from a drawn manufacturer pump efficiency curve for the maximum pump frequency of 100 Hz, and then a polynomial regression generates a curve K100, which is processed by the software implemented in the computer 34 and displayed on the screen 42 in a diagram can be, where the abscissa indicates the flow rate and the ordinate the efficiency in%.
  • Fig. 9 from this curve K100 then further pump efficiency curves K95, K90, K85, K80, K75, K70 and K65 for the frequencies of 95 Hz, 90 Hz, 85 Hz, 80 Hz, 75 Hz, 70 Hz and 65 Hz are derived.
  • the pump efficiency becomes ⁇ 100, ⁇ 95, ⁇ 90 , ⁇ 85, ⁇ 80, ⁇ 75, ⁇ 70 and ⁇ 65 (not shown) at the respective frequency of 100 Hz, 95 Hz, 90 Hz, 85 Hz, 80 Hz, 75 Hz, 70 Hz and 65 Hz.
  • the seventh step from the overall efficiency characteristic curve M for a plurality of flow rate support points, for example 60 m 3 / h, 65 m 3 / h, 70 m 3 / h, ... 130 m 3 / h, 135 m 3 / h , 140 m 3 / h the corresponding total power calculated.
  • the characteristic curve J of the specific power or energy requirement is calculated from this by dividing the associated total power for each flow rate support point by the associated flow rate and interpolating the resulting values into the characteristic curve J.
  • the computer 34 calculates the delivery or flow rate at the minimum of the characteristic J of the specific power or energy requirement and displays this on the screen 42 by a vertical line Q1. At the same time, the computer 34 also calculates the delivery or flow rate at the intersection S2 of the pump efficiency characteristic E with the system characteristic D and displays it on the screen by a vertical line Q2 as well, as in FIG Fig. 7 shown.
  • the computer 34 compares the two flow rates Q1 and Q2 calculated in this way. If the comparison shows that the delivery or flow rates Q1 and Q2 are identical, then the computer 34 transmits one of these delivery or flow rates Q1, Q2 as the target flow rate to the control unit 30. If the comparison shows that the Flow or flow rate Q1 is greater than the delivery or flow rate Q2, the computer 34 transmits the delivery or flow rate Q1 as a target flow rate to the control unit 30. If the comparison shows that the flow or flow Q1 smaller is as the flow or flow Q2, as in Fig. 7 illustrated, then the computer 34 transmits the delivery or flow rate Q1 as a target flow rate to the control unit 30 as long as this delivery or flow rate Q1 is achieved by the feed pump 14.
  • the computer 34 transmits the delivery or flow rate Q2 as the target flow rate the control unit 30th
  • the setpoint flow rate transmitted by the computer 34 is compared with the instantaneous actual flow rate measured by the flow rate measurement device 26 and transmitted to the control and regulation unit 30.
  • the control unit 30 then generates from a possible difference between the two values a control value for the frequency converter 38, which then changed by a corresponding change in frequency, the drive speed of the feed pump 14 until the actual flow rate coincides with the target flow rate.
  • the computer 34 has transmitted the delivery or flow rate Q1 or Q2 as the target flow rate to the control and regulation unit 30, shifts the change in frequency, the pump characteristic F, until their intersection S1 with the system curve D either exactly is above the minimum of the characteristic J or coincides with the intersection S2.
  • the latter is in Fig. 5 for the pump characteristic H calculated at the new frequency.
  • Fig. 7 displayed diagram displayed on the screen 42 of the computer 34.
  • the operator can on the one hand visually compare which of the delivery or flow rates Q1 or Q2 is greater.
  • the operator can see whether the point of intersection S1 of the pump curve F with the system curve D is as desired exactly above the minimum of the curve J or coincides with the intersection S2 or if the intersection S1 is tracked as desired the minimum or the intersection S2 when the measured pressure at the outlet of the pump 14 and / or the lowering of the water level in the well 12 change and thereby the system curve D shifts.
  • characteristics D, E, F and H are displayed on the screen 42 of the computer 36, the measured actual flow rate and the target flow rate at the output of the pump 14 as numerical values side by side. In this way, the operator can compare the two values at a glance.
  • the current specific power or energy demand of the feed pump 14 the measured pressure at the outlet of the feed pump 14, the instantaneous water level in the well 12, the actual frequency of the feed pump 14 supplied AC and the delivery or flow rate at the output of Feed pump 14 displayed as numerical values.
  • the fountain 50 in Fig. 2 differs from the well system 10 described above in that it comprises a plurality of wells 12 and a plurality of feed pumps 14, which convey through a common line network 52 into the reservoir 16, but controlled by a single control unit 30 and a single computer 34 be managed.
  • the feed pumps 14 can be switched on or off individually if required, if the amount of water to be pumped is to be increased or decreased. By connecting or disconnecting individual feed pumps 14 results for the other currently in operation feed pumps 14 constantly new system characteristics D, which are continuously calculated by the computer 34 using the software.
  • the calculation is done separately for each operating pump 14 and independently of the other operating pumps 14 in operation in the manner previously described by continuously calculating an associated system characteristic D for each of the operating pumps 14 in operation by thereafter the characteristic curve J of the specific power or energy requirement and its minimum and, if appropriate, also the intersections S1 and S2 of the calculated system characteristic D with the associated pump characteristic F and with the associated pump efficiency characteristic E for the maximum efficiency, and finally Flow rate at the intersection S1 of the calculated system characteristic D with the associated pump characteristic F by changing the frequency and the drive speed of the pump 14 by means of the control unit and the associated frequency converter 38 to the target flow rate Q1 and Q respectively 2 in the Minimum of the characteristic J or at the intersection S2 of the calculated system characteristic D with the associated pump efficiency characteristic E is introduced.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Non-Positive-Displacement Pumps (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
EP16000069.1A 2015-01-20 2016-01-13 Réduction de la consommation d'énergie d'une pompe à eau à vitesse variable en tenant compte de la charge instantannée du système Active EP3048305B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102015000373.9A DE102015000373A1 (de) 2015-01-20 2015-01-20 Verfahren zur Reduzierung des Energieverbrauchs einer Förderpumpe, die Wasser aus einem Brunnen in ein Leitungsnetz fördert, sowie Anlage zum Fördern von Wasser aus mindestens einem Brunnen in ein Leitungsnetz
DE102015011487.5A DE102015011487A1 (de) 2015-09-08 2015-09-08 Verfahren zur Reduzierung des Energieverbrauchs einer Förderpumpe, die Wasser aus einem Brunnen in ein Leitungsnetz fördert, sowie Anlage zum Fördern von Wasser aus mindestens einem Brunnen in ein Leitungsnetz

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111368246A (zh) * 2020-03-30 2020-07-03 河南九域恩湃电力技术有限公司 一种基于性能实测的凝结水泵节能改造评估方法
CN111597687A (zh) * 2020-04-17 2020-08-28 西安理工大学 一种可变速抽水蓄能机组水泵工况效率寻优方法
EP4365452A1 (fr) * 2022-10-21 2024-05-08 BSH Hausgeräte GmbH Réglage adaptatif de la vitesse de rotation de pompes à courant libre dans des appareils ménagers à circulation d'eau

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JPS54122401A (en) * 1978-03-16 1979-09-22 Toshiba Corp High-efficiency operation controller for drain pumps
EP0150068A2 (fr) * 1984-01-23 1985-07-31 RHEINHÜTTE vorm. Ludwig Beck GmbH & Co. Procédé et dispositif de contrôle de différents paramètres de fonctionnement pour pompes et compresseurs
EP2610693A1 (fr) * 2011-12-27 2013-07-03 ABB Oy Procédé et appareil pour optimiser l'efficacité énergétique dans un système de pompage
EP2944821A1 (fr) * 2014-05-13 2015-11-18 Wilo Se Procédé de réglage de la vitesse de rotation à énergie optimisée d'un groupe motopompe

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS54122401A (en) * 1978-03-16 1979-09-22 Toshiba Corp High-efficiency operation controller for drain pumps
EP0150068A2 (fr) * 1984-01-23 1985-07-31 RHEINHÜTTE vorm. Ludwig Beck GmbH & Co. Procédé et dispositif de contrôle de différents paramètres de fonctionnement pour pompes et compresseurs
EP2610693A1 (fr) * 2011-12-27 2013-07-03 ABB Oy Procédé et appareil pour optimiser l'efficacité énergétique dans un système de pompage
EP2944821A1 (fr) * 2014-05-13 2015-11-18 Wilo Se Procédé de réglage de la vitesse de rotation à énergie optimisée d'un groupe motopompe

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111368246A (zh) * 2020-03-30 2020-07-03 河南九域恩湃电力技术有限公司 一种基于性能实测的凝结水泵节能改造评估方法
CN111368246B (zh) * 2020-03-30 2023-03-24 河南九域恩湃电力技术有限公司 一种基于性能实测的凝结水泵节能改造评估方法
CN111597687A (zh) * 2020-04-17 2020-08-28 西安理工大学 一种可变速抽水蓄能机组水泵工况效率寻优方法
CN111597687B (zh) * 2020-04-17 2024-03-29 西安理工大学 一种可变速抽水蓄能机组水泵工况效率寻优方法
EP4365452A1 (fr) * 2022-10-21 2024-05-08 BSH Hausgeräte GmbH Réglage adaptatif de la vitesse de rotation de pompes à courant libre dans des appareils ménagers à circulation d'eau

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