KR101585175B1 - Apparatus and method of reduced operation for power consumption of parallel operation pump - Google Patents

Apparatus and method of reduced operation for power consumption of parallel operation pump Download PDF

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KR101585175B1
KR101585175B1 KR1020150135644A KR20150135644A KR101585175B1 KR 101585175 B1 KR101585175 B1 KR 101585175B1 KR 1020150135644 A KR1020150135644 A KR 1020150135644A KR 20150135644 A KR20150135644 A KR 20150135644A KR 101585175 B1 KR101585175 B1 KR 101585175B1
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South Korea
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pump
flow rate
individual
efficiency
calculated
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KR1020150135644A
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Korean (ko)
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유희찬
오희경
엄정열
조금숙
강성훈
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(주)대우건설
주식회사 리벤타코리아
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/007—Installations or systems with two or more pumps or pump cylinders, wherein the flow-path through the stages can be changed, e.g. from series to parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B23/00—Pumping installations or systems
    • F04B23/04—Combinations of two or more pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • F04B49/065—Control using electricity and making use of computers
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
    • G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
    • G01K13/00—Thermometers specially adapted for specific purposes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R11/00—Electromechanical arrangements for measuring time integral of electric power or current, e.g. of consumption
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/02—Pressure in the inlet chamber
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/05—Pressure after the pump outlet
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/09—Flow through the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B2205/00—Fluid parameters
    • F04B2205/10—Inlet temperature

Abstract

More particularly, the present invention relates to a parallel operation pump system, and more particularly, to a hydraulic pump system in which a discharge flow rate of each individual pump in a parallel operation state is determined by a hydraulic calculation method and a thermodynamic calculation method, and among pumps connected in parallel to each individually calculated flow rate The present invention relates to a device for reducing power consumption of a parallel operation pump and a method thereof, in which a pump having a minimum power unit level and a maximum pump efficiency is selected and a pump combination is presented to an operator.

Description

Field of the Invention [0001] The present invention relates to an apparatus and a method for reducing power consumption in a parallel operation pump,

More particularly, the present invention relates to a parallel operation pump system, and more particularly, to a hydraulic pump system in which a discharge flow rate of each individual pump in a parallel operation state is determined by a hydraulic calculation method and a thermodynamic calculation method, and among pumps connected in parallel to each individually calculated flow rate The present invention relates to a device for reducing power consumption of a parallel operation pump and a method thereof, in which a pump having a minimum power unit level and a maximum pump efficiency is selected and a pump combination is presented to an operator.

In general, when several large-capacity pumps are installed in parallel, such as a pump station, the efficiency of each pump is different, and the change of the head varies according to the flow rate. Therefore, it is necessary to check the accurate value of the individual flow rate of each pump, And a pump having a high efficiency are operated in combination to reduce the economic loss.

In the past, the flow rate of the pump was selected using one of the hydraulic calculation method or the thermodynamic calculation method.

First, it is often difficult to install a flowmeter due to limitations such as the direct measurement of the flow meter and pressure gauge installed in each pump, the space of the pumping station and securing the intuitive distance.

In addition, the thermodynamic calculation method can accurately measure the loss energy of the pump with a high-precision thermometer, and it is possible to measure the efficiency of the individual pump in real time even when the pump is operated in parallel. However, .

Korean Patent Publication No. 10-2007-0092445 Korean Patent Publication No. 10-1484265

In order to solve the above problems, it is an object of the present invention to solve the above-mentioned problems, and to provide a pump control apparatus and a pump control method of the present invention, in which a discharge flow rate of each individual pump in a parallel operation state is determined by a hydraulic calculation method and a thermodynamic calculation method, The present invention aims to provide an apparatus and method for reducing the power consumption of a parallel operation pump, in which a pump having a power consumption level and a maximum pump efficiency is selected and a pump combination is presented to an operator and the pump is operated accordingly.

According to an aspect of the present invention,

A pump system comprising a main inflow pipe, a plurality of branch pipes branched from the main inflow pipe, a main discharge pipe in which the branch pipes are combined, and a plurality of pumps respectively provided in the branch pipe, A flow meter installed in the pipe and measuring the total sum flow rate; First and second pressure gauges provided respectively at the front and rear ends of the respective pumps on the branch pipes for measuring the pressure of the fluid; First and second thermometers respectively installed on the branch piping and at the front and rear ends of the respective pumps to measure the temperature of the fluid; A watt hour meter for measuring the power of each pump; A PLC for inputting and receiving measured values from the flow meter, the first and second pressure gauges, the first and second thermometers, and the watt hour meter; And the measured values are input from the flow meter, the first and second pressure gauges, the first and second thermometers, and the watt hour meter, which are transmitted from the PLC, and the hydraulic flow rate calculation method is used to calculate the individual flow rate (Q H ) After calculating the individual flow rate (Q T ) of each pump, calculate the individual efficiency of the pump and the power unit, calculate the ranking of each pump in the order of high pump efficiency and low power unit. And a computer for controlling the pumps based on the combination of the pumps.

Here, the computer determines the average pump head of each pump by using the flow meter and the measured values measured by the first and second pressure gauges transmitted from the PLC, and measures the average pump head and the total sum flow chemical flow rate, and calculating individual flow (Q H) of each pump to the calculation method, the individual flow rate (Q T) of each pump by using the respective measured value measured at the first and second thermometer transmitted from the PLC to the thermodynamic flow rate calculation method (Q H ) and the individual flow rate (Q T ) are calculated by dividing the sum of the individual flow rate (Q H ) and the individual flow rate (Q T ) Each pump is ranked in the order of high efficiency and low power consumption after calculating the power unit using the individual efficiency and the average flow rate (Q) of the pump and the amount of power measured from the watt-hour meter .

Here, the computer further comprises means for determining whether or not the flow meter, the first and second pressure gauges, and the first and second thermometers are abnormal when the error between the individual flow rate (Q H ) and the individual flow rate (Q T ) If no abnormality is found, the individual flow rate (Q H ) of each pump is calculated by the hydraulic flow calculation method, and then the pump individual efficiency and power unit cost are calculated by using this.

Herein, the computer continuously calculates the individual efficiency of the pump and the power unit, and when the operation time and the power unit of the pump increase, and the individual efficiency of the pump decreases, the combination is changed by the subordinate pump and the change is provided to the operator do.

According to another aspect of the present invention,

In the method of reducing power consumption of a parallel operation pump using the power consumption reduction operating device of the parallel operation pump, an average pump of each pump connected in parallel using the measured values measured by the flow meter and the first and second pressure gauges A first step of calculating a heading; A second step of calculating the individual flow rate (Q H ) of each pump by the hydraulic flow rate calculation method using the calculated average pump head and the total sum flow rate measured by the flow meter; A third step of calculating an individual flow rate (Q T ) of each pump by a thermodynamic flow rate calculation method using the measured values measured in the first and second thermometers and the watt-hour meter; A fourth step of detecting an error of two values by comparing the individual flow rate (Q H ) and the individual flow rate (Q T ) of each pump calculated; A fifth step of calculating the pump individual average flow rate Q by dividing the sum of the calculated individual flow rate Q H of each pump and the individual flow rate Q T when the error value is less than the reference error; A sixth step of calculating the pump individual efficiency through the pump individual average flow rate (Q), calculating the power unit level using the pump individual average flow rate (Q) and the amount of power measured from the watt hour meter; And a combination of the pump that sends the predetermined required flow rate so that the operation time of each pump is unbalanced by setting the order of each pump in the order of the pump individual efficiency and the calculated power efficiency, And controlling the pumps based on the seventh step.

Here, the method of reducing power consumption of the parallel operation pump includes:

If the error between the individual flow rate (Q H ) and the individual flow rate (Q T ) of each pump is equal to or greater than the reference error, check the abnormality of the flowmeter, the first and second pressure gauges, the first and second thermometers, And an eighth step of calculating an individual flow rate (Q H ) of each pump by a calculation method.

Here, in the seventh step, the pump individual efficiency and power unit cost are continuously calculated, and when the operation time and power unit level of the primary pump are increased and the individual efficiency of the pump is decreased, the combination is changed to the subordinate pump, .

According to the apparatus and method for reducing the power consumption of the parallel operated pump of the present invention constructed as described above, the discharge flow rate of each individual pump in the parallel operation state at the pump station is determined by the hydraulic calculation method and the thermodynamic calculation method, Among the pumps connected in parallel to the flow rate, the pump having the lowest power unit level and the highest pump efficiency is selected, and the pump combination is presented to the operator. Accordingly, the pump power consumption can be reduced by operating the pump.

FIG. 1 is a block diagram showing a configuration of a power consumption reduction operating device of a parallel operation pump according to the present invention.
FIG. 2 is a flowchart illustrating a method of reducing power consumption of a parallel operation pump according to the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a configuration of an apparatus for reducing power consumption of a parallel operation pump according to the present invention will be described in detail with reference to the accompanying drawings.

In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. The following terms are defined in consideration of the functions of the present invention, and these may be changed according to the intention of the user, the operator, or the like. Therefore, the definition should be based on the contents throughout this specification.

FIG. 1 is a block diagram showing a configuration of a power consumption reduction operating device of a parallel operation pump according to the present invention.

1, the apparatus for reducing power consumption of a parallel operation pump according to the present invention comprises a plurality of pumps P 1 to P n , a flow meter F t , a first and a second pressure gauges P in , P out ), a first and a second thermometers T in and T out , a watt hour meter W, a PLC 10 and a computer 20.

First of all, the pumps P 1 to P n are connected to a main inflow pipe L 1, a plurality of branch pipes L 2 branched from the main inflow pipe L 1, (L3) and the branch pipe (L2), respectively, and are operated under the control of the computer 20 described below.

The flowmeter F t is installed in the main discharge pipe L 3 to measure the total sum flow rate discharged from each of the pumps P 1 to P n .

The first and second pressure gauges P in and P out are respectively provided at the front and rear ends of the respective pumps to measure the pressure of the fluid discharged from the respective pumps P 1 to P n .

The first and second thermometers T in and T out are respectively provided at the front and rear ends of the respective pumps P 1 to P n to measure the temperature of the fluid. Preferably, the first and second thermometers (T in , T out ) are applied with a high-precision thermometer so as to calculate a thermodynamic flow rate using a minute temperature difference.

Then, the watt hour meter W measures the power of each of the pumps P 1 to P n .

In addition, PLC (10) through a wired or wireless communication network from the flow meter (F t) and the first and second pressure gauges (P in, P out) and a first and second thermometer (T in, T out) and power meter (W) And transmits the measured values to the computer 20 through the wired / wireless communication network. At this time, if the measured values are analog signals, the PLC 10 may convert the digital signals into digital signals and transmit them.

On the other hand, the computer 20 includes a flow meter (F t) to be transmitted from the PLC (10), first and second pressure gauges (P in, P out) and a first and second thermometer (T in, T out) and power meter ( W) from the respective flow rate of the individual flow rates (to Q H) and thermodynamic flow rate calculation method the pumps (P 1 ~ P n) of each pump (P 1 ~ P n) by receiving the measurement hydraulic flow rate calculation method, respectively (Q T ), The individual efficiency of the pump and the power unit are calculated, and the order of each pump (P 1 to P n ) is determined in the order of high individual efficiency of the pump and low power intensity, (P 1 to P n ) for sending and receiving predetermined required flow rates, and controls each of the pumps (P 1 to P n ) based on the combination of the pumps.

At this time, the computer 20 and the flow meter (F t) to be transmitted from the PLC (10), first and second pressure gauges, each pump by using the respective measurement values measured in (P in, P out), (P 1 ~ P n (Q H ) of each pump (P 1 ~P n ) is calculated by a hydraulic flow calculation method using an average pump head and a total sum flow rate, and transmitted from the PLC (10) (Q T ) of each pump (P 1 to P n ) is calculated by a thermodynamic flow calculation method using the measured values measured at the first and second thermometers T in and T out , The pump individual efficiency (Q) is calculated. When the pump individual efficiency and pump individual average flow rate (Q) and the power amount measured from the watt hour meter (W) are used, The order of each pump (P 1 ~P n ) is determined in descending order of power intensity.

The computer 20 also controls the flow meter F t when the error between the individual flow rate Q H of the respective pumps P 1 to P n and the individual flow rate Q T is equal to or greater than the reference error (for example, 5% And the first and second pressure gauges P in and P out and the first and second thermometers T in and T out are checked. If there is no abnormality, hydraulic pumps P 1 to P n ), And then calculates the individual efficiency and power unit cost of the pump by using the calculated individual flow rate (Q H ). At this time, if an abnormality occurs

In addition, the computer 20 continuously calculates the individual efficiency of the pump and the power unit, and if the operation time and the power unit of the pump increase, and the individual efficiency of the pump decreases, the combination is changed by the subordinate pump, do.

FIG. 2 is a flowchart illustrating a method of reducing power consumption of a parallel operation pump according to the present invention.

&Quot; First step-S10 &

First, the computer 20 and the flow meter (F t) to be transmitted from the PLC (10), first and second pressure gauges, each pump by using the respective measurement values measured in (P in, P out), (P 1 ~ P n ) ≪ / RTI >

&Quot; Second Step-S20 &

Once the average pump head has been determined, the computer 20 calculates the individual flow rate (Q H ) of each pump (P 1 -P n ) using a hydraulic flow rate calculation using the average pump head and total combined flow rate.

The first step (S10) and the second step (S20) will be described in more detail as follows.

The invention gun discharged from each pump (P 1 ~ P n), not the method of calculating the flow rate by installing a flow meter for each pump in the hydraulic flow rate calculation method by installing a flow meter (F t) for the main discharge line (L3) After measuring the combined flow rate, the average pump head of the operating pump (P 1 ~P n ) is determined using the assumption that the operation head of each pump (P 1 ~P n ) 1 to P n ), the flow rate is calculated by the average pump head and flow rate relation.

And, the relation between the average pump head (y) and the total sum flow (x) for a specific combination of pumps in operation can be determined by information collected during operation (suction pressure, discharge pressure). For example, pump 1 or pump 2 is operated as follows.

Figure 112015093411806-pat00001

Using the same n-order polynomial for the total combined flow (x) above, the average pump head (y) and total combined flow (x) of the individual pumps are defined as unknown coefficients solved by the algorithm. For example, the case of the pump 1 is as follows.

Figure 112015093411806-pat00002

To obtain the unknown coefficient in the average pump head (y) -total sum flow (x) relationship for an individual pump, a minimum value for the total combined flow is required.

For example, if three pumps are in a parallel arrangement, the average pump head (y) - total sum flow relationship (ie, three different pumping scenarios) is required. For example, these data can be obtained by operating three scenarios: Pump 1 and Pump 2, then Pump 2 and Pump 3, and then Pump 1 and Pump 3. Alternatively, three scenarios can be obtained by operating pump 1, then pumps 1 and 2, and then pumps 1 and 3.

It is considered that various pumping scenarios should be performed in order to obtain the minimum data necessary to solve the flow-rate relationship of each individual pump. A series of pumping scenarios are required to obtain the minimum demand data, and each scenario must have at least one pump running and each individual pump operating in at least one different scenario.

In the following example, head and total sum flow data are obtained for the following pump combinations, 1 & 2, 1 & 3, 2 & 3.

The data given for the three kinds of quadratic functions are as follows.

Figure 112015093411806-pat00003

Assume y12 = y13 = y23 = y t This was given.

Figure 112015093411806-pat00004

The coefficient of the implied quadratic function can be obtained by the following equation (6).

Figure 112015093411806-pat00005

First, we use equations (4), (5) and (6) to find the expression for the independent variables x 1 , x 2 , x 3 in the values of x 12 , x 13 and x 23 based on y t . The three kinds of relations can be represented by a 3x3 matrix equation.

Figure 112015093411806-pat00006

or

Figure 112015093411806-pat00007

By solving the following matrix equation

Figure 112015093411806-pat00008

The numerical values for x = (x 1 , x 2 , x 3 ) are obtained and appear as follows.

Figure 112015093411806-pat00009

Finally, the following matrix is derived.

Figure 112015093411806-pat00010

In addition, an equation for x is established.

Figure 112015093411806-pat00011

This relationship always has a constant value of y = y t . Strictly speaking, this method applies only to quadratic equations where the opposite case exists and the numerical value changes as in the equation.

Figure 112015093411806-pat00012

Since there is no turning point in the upper right corner of the numerical range, this should always be applied to this problem.

Now, given y t , the quadratic function to solve is:

Figure 112015093411806-pat00013

There is a known value of x 1 , x 2 , x 3 for y t .

Figure 112015093411806-pat00014

Substituting the known values into the equations (24) - (26), the following is summarized.

Figure 112015093411806-pat00015

The three kinds of equations have nine unknowns such as a 1 , a 2 , a 3 , b 1 , b 2 , b 3 , c 1 , c 2 , c 3 for y t . Therefore, in order to reliably solve this system, we need to take three y-constant values for y t , y u , and y v . Then, there are nine unknowns and nine equations.

Figure 112015093411806-pat00016

The three groups of three equations of three unknowns are as follows.

Figure 112015093411806-pat00017

With i = 1, 2, and 3, the following matrix equation reappears.

Figure 112015093411806-pat00018

The unknown vector b and the unknown x vector in the known matrix A can be found. To solve the equation, we need to find the opposite matrix again.

Figure 112015093411806-pat00019

Using a computer algebra system such as Maple, we can obtain a form close to A -1 with the following formula:

Figure 112015093411806-pat00020

Therefore, we can perform matrix multiplication to obtain the following formula.

Figure 112015093411806-pat00021

(27) - (29) Finally, all the necessary coefficients related to the known value can be calculated using a formula similar to the two kinds of measuring points for obtaining x i, u and x i, v .

It is not necessary to use only three constant values y. To mitigate the problem of data, you can write more baselines to limit the system. However, in this case, it is impossible to obtain a form close to A -1 , so we use numerical methods to solve this system.

The program has an input-file with x, y values for three constant values y.

Figure 112015093411806-pat00022

Using the values on the given sample data, create the following three sample input files. 'sample1.dat' is as follows.

Figure 112015093411806-pat00023

'sample2.dat' is as follows.

Figure 112015093411806-pat00024

'sample3.dat' is as follows.

Figure 112015093411806-pat00025

The following three kinds of sample files are obtained.

Figure 112015093411806-pat00026

The results from the three kinds of sample files representing the same data are matched with each other, and the accuracy of the result can be obtained.

A 1 , a 2 , a 3 , b 1, ..., which are replaced by equations (7) - (9) , and c 3 coefficients, the relational expression of the average pump head (y) - total sum flow (x) of each individual pump is determined. Thus, for a given head, the individual flow rate Q H of each pump P 1 to P n is determined.

&Quot; Step 3-S30 &

Subsequently, the computer 20 uses the measured values measured in the first and second thermometers (T in , T out ) transmitted from the PLC 10 to calculate the thermodynamic flow rate of each of the pumps P 1 to P n The individual flow rate (Q T ) is calculated.

More specifically, the first and second thermometers (T in , T out ) are used to measure the thermodynamic change amount of the fluid in each of the pumps (P 1 to P n ), and the flow rate is calculated.

If the first law of thermodynamics is applied by simplifying the pump to a steady-state adiabatic opening system with suction and discharge ports, the uniformity W in input to the pump appears as the effective output power W out and the loss rate losses.

Figure 112015093411806-pat00027

Where the effective output date W out is expressed as the product of the flow Q and the head horse lift ΔH. At this time, if various flow loss losses occurring in the pump are represented by the temperature rise ΔT of the passing fluid,

Figure 112015093411806-pat00028

Lt; / RTI > At this time,

Figure 112015093411806-pat00029
Is the ratio of the effective output power to the input power

Figure 112015093411806-pat00030

Can be calculated as follows.

On the other hand, the effective output W out of the pump is the input uniformity Pm of the motor,

Figure 112015093411806-pat00031
, Pump efficiency
Figure 112015093411806-pat00032
Lt; / RTI >

Figure 112015093411806-pat00033

And the flow rate Q of each pump is

Figure 112015093411806-pat00034

. ≪ / RTI >

Here, Q in the equations (28), (30) and (31) is the individual flow rate (Q T ) of each pump (P 1 to P n ).

"Fourth Step-S40"

Then, the computer 20 compares the calculated individual flow quantity Q H with the individual flow quantity Q T to detect an error of the two values as shown in the following equation (32).

Figure 112015093411806-pat00035

"Step 5-S50"

Thus, when the error value is less than the reference error (S51), the computer 20 calculates the pump individual average flow rate Q as shown in the following Equation 33 (S52).

Figure 112015093411806-pat00036

&Quot; Sixth step-S60 &

Then, the computer 20 calculates the pump individual efficiency (Q) using the calculated pump individual average flow rate Q

Figure 112015093411806-pat00037
And calculates the power unit level (kwh / m 3 ) using the calculated pump individual average flow rate Q and the electric power amount (kWh) measured from the electric power meter (W).

That is, using the equations (30) and (32), the efficiency of the individual pump

Figure 112015093411806-pat00038
(KWh) of the flow rate (Q) (m 3 ) calculated by the watt hour meter installed in each individual pump, and calculates the power consumption (kWh) / m 3 ).

"Step 7-S70"

Then, the computer 20 determines the order of each of the pumps P 1 to P n in the order of the high efficiency and the low power unit through the calculated pump individual efficiency and the power unit, and then, Provides a combination of pumps to transmit the predetermined required flow rate to the manager, and controls each pump (P 1 to P n ) on the basis thereof.

Thereafter, the computer 20 continuously calculates the pump individual efficiency and power unit level while repeating the above-described process in real time. When the operation time and power unit level of the primary pump are increased and the efficiency is decreased, the combination is changed to the subordinate pump Provide the operator with the changes.

"Step 8 -S80"

On the other hand, the or more errors based on the error in the step 5 (S5), the computer 20 is the flow meter (F t) and the first and second pressure gauges (P in, P out) and a first and second thermometer (T in, If no abnormality is found (S81), to determine the presence of error in T out) (S82), the calculated individual flow (Q H) of each pump (P 1 ~ P n) to the hydraulic flow rate calculation method, and then (S83), the The process is passed to step S60 and then the process is performed. At this time, if an error occurs, it is preferable to provide an error message to pass the process to the eighth step (S80) to perform the subsequent process.

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While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. It is to be understood, however, that the invention is not to be limited to the specific forms thereof, which are to be considered as being limited to the specific embodiments, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention as defined by the appended claims. .

The present invention is applicable not only to a pump station but also to all industrial sites where a plurality of pumps are connected in parallel.

10: PLC 20: computer
F t : Flow meter P 1 ~ P n : Pump
P in , P out : first and second pressure gauge T in , T out : first and second thermometers
W: Watt hour meter

Claims (7)

A pump system comprising a main inflow pipe, a plurality of branch pipes branched from the main inflow pipe, a main discharge pipe in which the branch pipes are combined, and a plurality of pumps respectively provided in the branch pipe,
A flow meter installed in the main discharge pipe for measuring a total sum flow rate;
First and second pressure gauges provided respectively at the front and rear ends of the respective pumps on the branch pipes for measuring the pressure of the fluid;
First and second thermometers respectively installed on the branch piping and at the front and rear ends of the respective pumps to measure the temperature of the fluid;
A watt hour meter for measuring the power of each pump;
A PLC for inputting and receiving measured values from the flow meter, the first and second pressure gauges, the first and second thermometers, and the watt hour meter; And
The measured values are input from the flow meter, the first and second pressure gauges, the first and second thermometers, and the watt hour meter, which are transmitted from the PLC, and are measured by a hydraulic flow rate calculation method using the individual flow rate Q H of each pump and the thermodynamic flow rate calculation method. After calculating the individual flow rate (Q T ) of the pump, calculate the individual efficiency of the pump and the power unit, calculate the rank of each pump in the order of high pump efficiency and low power unit, And a computer for controlling each of the pumps based on the combination of the pump and the pump. The method according to claim 1,
The computer,
The average pump head of each pump is determined by using the flow meter and the measured values measured by the first and second pressure gauges transmitted from the PLC, and the average pump head and the total sum flow rate are used to calculate each pump one calculates a separate flow (Q H), calculated for each flow rate (Q T) of each pump by using the respective measured value measured at the first and second thermometer transmitted from the PLC to the thermodynamic flow rate calculation method, and then, these cross- (Q H ) and individual flow rate (Q T ) of each pump calculated by dividing the sum of the individual flow rates (Q T ) of the respective pumps by 2, and calculating the individual pump average flow rate (Q) Wherein a rank of each pump is set in the order of high efficiency and low power intensity after calculating the power unit using the flow rate Q and the amount of power measured from the watt hour meter, Power consumption reduction device of operation pump. 3. The method of claim 2,
The computer,
If the error between the individual flow rate (Q H ) and the individual flow rate (Q T ) of each pump is equal to or greater than the reference error, check whether the flowmeter, the first and second pressure gauges, the first and second thermometers are abnormal, Wherein the individual flow rate (Q H ) of each pump is calculated by a flow rate calculation method, and then the individual efficiency and the power unit level of the pump are calculated by using the calculated flow rate (Q H ). The method according to claim 1,
The computer,
The pump individual efficiency and power unit cost are continuously calculated, and when the operation time and power unit level of the primary pump are increased and the individual efficiency of the pump is decreased, the combination is changed by the subordinate pump and the change contents are provided to the operator. Power consumption reduction device of pump. A method for reducing power consumption of a parallel operation pump using the power consumption reduction operating device of the parallel operation pump of claim 1,
A first step of calculating an average pump head of each of the pumps connected in parallel using the flowmeter and the measured values measured by the first and second pressure gauges;
A second step of calculating the individual flow rate (Q H ) of each pump by the hydraulic flow rate calculation method using the calculated average pump head and the total sum flow rate measured by the flow meter;
A third step of calculating an individual flow rate (Q T ) of each pump by a thermodynamic flow rate calculation method using the measured values measured in the first and second thermometers and the watt-hour meter;
A fourth step of detecting an error of two values by comparing the individual flow rate (Q H ) and the individual flow rate (Q T ) of each pump calculated;
A fifth step of calculating the pump individual average flow rate Q by dividing the sum of the calculated individual flow rate Q H of each pump and the individual flow rate Q T when the error value is less than the reference error;
A sixth step of calculating the pump individual efficiency through the pump individual average flow rate (Q), calculating the power unit level using the pump individual average flow rate (Q) and the amount of power measured from the watt hour meter; And
The combination of the pump that sends the predetermined required flow rate so that each pump's rank is ranked in order of the individual efficiency of the pump and the power unit, the individual efficiency of the pump is high and the power unit is low. And a seventh step of controlling each of the pumps based on the seventh step. 6. The method of claim 5,
The method for reducing the power consumption of the parallel operation pump includes:
If the error between the individual flow rate (Q H ) and the individual flow rate (Q T ) of each pump is equal to or greater than the reference error, check the abnormality of the flowmeter, the first and second pressure gauges, the first and second thermometers, And calculating an individual flow rate (Q H ) of each pump by a calculation method. 6. The method of claim 5,
In the seventh step,
The pump individual efficiency and power unit cost are continuously calculated, and when the operation time and power unit level of the primary pump are increased and the individual efficiency of the pump is decreased, the combination is changed by the subordinate pump and the change contents are provided to the operator. How to reduce the power consumption of the pump.
KR1020150135644A 2015-09-24 2015-09-24 Apparatus and method of reduced operation for power consumption of parallel operation pump KR101585175B1 (en)

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KR101753891B1 (en) * 2016-11-28 2017-07-19 (주)대우건설 Apparatus and method of reduced operation for power consumption of parallel operation pump

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KR101408675B1 (en) 2014-03-20 2014-06-18 주식회사 두크 Booster pump system and its control method
KR101483241B1 (en) 2013-04-25 2015-01-16 이앤엠 주식회사 Method of diagnosing pump performance using thermodynamic flowmeters

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KR101483241B1 (en) 2013-04-25 2015-01-16 이앤엠 주식회사 Method of diagnosing pump performance using thermodynamic flowmeters
KR101408675B1 (en) 2014-03-20 2014-06-18 주식회사 두크 Booster pump system and its control method

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101753891B1 (en) * 2016-11-28 2017-07-19 (주)대우건설 Apparatus and method of reduced operation for power consumption of parallel operation pump

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