CN102562561A - Method for analyzing operation energy efficiency of pump set of industrial circulating water system - Google Patents
Method for analyzing operation energy efficiency of pump set of industrial circulating water system Download PDFInfo
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- CN102562561A CN102562561A CN2011104452127A CN201110445212A CN102562561A CN 102562561 A CN102562561 A CN 102562561A CN 2011104452127 A CN2011104452127 A CN 2011104452127A CN 201110445212 A CN201110445212 A CN 201110445212A CN 102562561 A CN102562561 A CN 102562561A
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Abstract
The invention discloses a method for analyzing the operation energy efficiency of a pump set of an industrial circulating water system, which is used for solving the problem of high judgment difficulty for the operation state of the pump set in a circulating water process under a changeable working condition. The method comprises the following steps of: firstly, establishing a water pump feature model library and an operation energy efficiency model of a water pump and a water pump set under the changeable working condition; and secondly, by considering the whole water pump set as an energy efficiency unit, proposing a concept of operation energy efficiency of the water pump set, and on the basis, carrying out real-time monitoring and continuous analysis on the operation energy efficiency of the whole pump set. In the invention, a lift value, a flow value and a shaft power value under a corresponding frequency condition are determined on the basis of a water pump power frequency operation feature model, and then, respective corresponding explicit models of lift and flow, efficiency and flow as well as shaft power and flow under different frequency conditions are established. The pump set can rapidly reset to operate under a high-efficiency condition according to the requirement of high efficiency of the system through monitoring the change of various boundary condition parameters.
Description
Technical field
The present invention relates in a kind of industrial circulating water flow process, under changeable working condition, with the operation of different complex combination forms, the operational energy efficiency analytical method of circulating water pump pump group.
Background technique
The industrial circulating water flow process its role is to guarantee that as the indispensable auxiliary link of the industrial main process flow process of difference the direct motion of main process safety, product reach the standard of production requirement.But since operation management side in the main process design process inevitably according to the expectation of enterprise development scale, higher flow scheme design loading intensity is proposed.And designing institute is in design process, and for the design load intensity that guarantees to realize that under design conditions the user proposes, the design of main process flow process keeps 10 ~ 20% safe clearance again usually.The design of this double amplification is the basic reason place of causing entire body technological process operational energy efficiency low.On the other hand, the design of this big surplus also is to cause in the flow process, and each installs the basic reason that service life shortens.
Simultaneously, because carrying out of enterprise production must depend on change of market, during actual motion, the inevitable design load that departs from flow process for a long time of operating load intensity.On the other hand, for any given technological process, an environmental working condition of meeting for many years under the design condition; Between certain and flow process actual motion environmental working condition; The greatest differences that exists, and on-the-spot operation side are usually in order to guarantee the safe direct motion of main process; In operation management, adopting the big surplus method of operation based on design conditions, is to cause process flow operation energy consumption and the high another key factor of enterprise pollution thing discharging.
Require in sustainable development under the main trend of increasingly stringent, for improving core competence of enterprises, the energy saving optimizing operation of industrial circulating water flow process is imperative.Certainly, for whole industrial cycle water system, the final goal of its energy saving in running will directly be presented as under changeable loading intensity and the environmental working condition condition minimizing of recycle pump group input power and output power.The circulating water pump group is as the heart of whole flow process, and under the changeable working condition, carrying out of system optimization must be based on the assurance to circulating water flow process roadability.Under the so different operating modes, with the complex form combined running, real-time monitoring, analysis and the demonstration of industrial circulating water flow process water pump assembly operational energy efficiency state have become the major issue that needs to be resolved hurrily.
In the Traditional industrial circulating water monitoring flow process, the process parameter of for water pump, being selected for use usually comprises: the flow of terminal valve aperture, electric machine frequency, current of electric, water pump and lift etc.These parameters are basic technology Operational Limitss that system can monitor in real time.But in actual moving process, these parameters can be according to the variation of user's operating mode and demand, and changes.And an important problem is that according to the rule of the conservation of mass and energy conservation, the variation of these parameters must be strong each other coupling.Be difficult to judge the operational energy efficiency state of water pump through any one single parameter.This causes under the changeable operating mode just, and the water pump operation state is difficult to the objective basic reasons that defines directly perceived.
In the actual moving process, since the variation of factors such as flow process load, environmental working condition and the market demand, the operation of water pump in the corresponding industrial circulating water flow process, and many water pumps of many usually employings move with the parallel way of various combination.This parallelly connected process; Although in theory all can require, the conformity of parallel water pump model and running state, actual moving process; Parallel water pump model and running state; Very likely do not satisfy this conforming requirement, cause the complexity of circulating water pump group method of operation combination to increase sharply, this has objectively increased the difficulty that the water pump assembly running state is judged undoubtedly.
Along with the maturation of converter technique, in the running of circulating water pump flow process, the introducing of different VFC modes; The inevitable lifting that causes circulating water pump pump group method of operation complexity once more; And this lifting, with regard to the system that lacks the objective analysis of pump group roadability, it optimizes monitor procedure must be to artificial experience for original; Form high dependence, cause circulating water flow process running Optimization objectively to carry out.
As the typical flow system; As far as the circulating water flow process, the roadability that its pump group of single analysis is apparent, operation and manager; Still can't be according to the variation of its numerical value; Control under the changeable operating mode, under the complex combination situation with multi-form, different frequency, the running state of circulating water flow process pump group.
Summary of the invention
The pump group operational energy efficiency analytical method that the purpose of this invention is to provide a kind of industrial cycle water system is judged the big problem of difficulty with the running state that solves circulating water flow process pump group under the changeable operating mode.
Technological scheme of the present invention is following:
At first, set up the foundation of water pump and water pump pump group operational energy efficiency model under water pump characteristic model storehouse and the changeable operating mode; Secondly, whole water pump pump group is thought of as an efficiency unit, proposes the notion of water pump pump group operational energy efficiency, and on its basis, the operational energy efficiency of entire pump group is monitored in real time and analyzed continuously.
Concrete steps are following:
The structure in A, water pump characteristic model storehouse;
The foundation of B, water pump and pump group operational energy efficiency model base;
Wherein the structure in water pump characteristic model storehouse comprises:
A1, power frequency running pump operating characteristic are analyzed the foundation of list item;
1) the real-time monitoring and the analysis of single pump power frequency operation characteristic
Based on the power frequency special parameter of specifying water pump to provide; Based on method of least squares, independently make up the demonstration continuous approximation model of water pump power frequency running, make the user can be directly according to the flow that is read; Judge the value of its corresponding lift, efficient and air horsepower; And utilize graphical interfaces technology, and intuitively be presented on the corresponding runnable interface of water pump identity server with in fact the time, monitor the change of running operating point in real time through this interface.
The foundation of A2, pump variable frequency analysis on Operating list item;
Under the different frequency condition, specify the similarity law of pump operating characteristic, in rational frequency conversion scope, can direct given different operating frequencys under, the continuous analytical model of pump operating characteristic.
The foundation of the analysis list item of A3, water pump parallel connection and parallelly connected frequency conversion characteristic;
Many water pump parallel connections, pump cohort control operation method are all adopted in the operation of water pump.Corresponding pipe network node place, the pressure that water pump provided (lift) value is identical, and flow adopts the method for stack.According to water pump unit power frequency and the single pump frequency conversion roadability model base set up in steps A 1 and the steps A 2, come deployment analysis item by item, promptly to set up respectively under the parallelly connected condition, pump group lift, efficient and air horsepower are with the display model of changes in flow rate.
The foundation of corresponding model is adopted with steps A 1 identical algorithm and is carried out, and can intuitively construct the appointment water pump, the explicit model of lift and flow under the various combination condition.Just corresponding discrete point is the operating point by unit operation, and is identical according to the corresponding node pressure head, flow mutual superposition and the discrete point that forms.
The foundation of B, water pump and pump group operational energy efficiency model base: to the water pump and the pump group of specifying model; Operational energy efficiency model according to correspondence; Make up operational energy efficiency data table items and table page or leaf, for different model water pump and corresponding combination and frequency conversion form thereof, different table pages or leaves can form the foundation of water pump and water pump pump group operational energy efficiency model; The icon instrument in application model storehouse; Can form the graphical interfaces of corresponding states water pump and pump group operational energy efficiency, this interface form can adopt the mode of coordinate graphic, and the operational energy efficiency of corresponding operating point is intuitively shown.
B1: the establishment of pump group efficiency unit; Whole water pump pump group (motor and the pump housing) is used as a complete efficiency unit, carries out the analysis of operational energy efficiency, for any one single pump, also can carry out the analysis of single intuitively pump operation efficiency;
B2: the foundation of water pump unit operation efficiency model;
Motor is under different rotating speed, and from total electric energy of input end input, as the total energy of this efficiency unit, the primary water geopotential energy sum of exit of pump sound pressure head and lifting is as effective output energy of system.Generally speaking, for given pipe network system, elementary water level is a definite value basically, and the variation of flow directly causes the variation of initial water level potential energy;
Power factor under the corresponding rotating speed is cos Φ, and power input to machine does
In the formula;
is under the respective frequencies; The voltage and current of motor, these two parameters generally all have Monitoring Data intuitively.
then is power input to a machine.
The effective output of water pump does
In the formula;
is the density of cycle fluid,
;
is gravity accleration,
;
flow for measuring,
;
required head of pipe network,
;
pipe network characteristic static pressure head; The water pump pressure head,
;
exit of pump pipeline sectional area,
.
The operational energy efficiency that then defines water pump in the running does
B3: the foundation of water pump pump group operational energy efficiency model
Whole water pump pump group is thought of as an efficiency unit, and the operating pressure that adopts house steward and flow be as molecule, and the air horsepower that will participate in moving water pump superposes and calculates the operational energy efficiency of entire pump group as denominator.
As further improvement of the present invention, the present invention also comprises the foundation of C, the efficient reset mechanism of water pump operation
C1, efficiently the reset selection of reference point;
During actual motion,, be reference with loading intensity and environmental working condition according to the historical data of water pump operation and present demand; Employing data sorting technology; Choose four reference points that reset, make the operating point of present operation, be in the interval of selected four reference points that reset; And read corresponding reference point, the method for operation of water pump and corresponding characteristics parameter.
C2: the confirming of pump operation actual conditions point;
In four operation reference points, be in running operating point upper right (flow and lift are all greater than desirable value) benchmark and be decided to be the basis, the Operational Limits that adopts this operating point is a benchmark.
As further improvement of the present invention; Said steps A 1 power frequency running pump operating characteristic is analyzed in the foundation of list item; Corresponding approximate power frequency characteristic model exists with following form, and the variation through flow can directly provide the pump operating characteristic values of parameters; Formula is following:
Wherein Q, H, η and N are respectively flow, lift, efficient and the air horsepower of water pump, and
is by being set up value corresponding undetermined coefficient in each model.
As further improvement of the present invention, in the foundation of said steps A 2 pump variable frequency analysis on Operating list items, the analysis of frequency conversion characteristic generally according to the similarity relation of frequency conversion, serves as the basis and launches according to following relation with the power frequency operation characteristic:
Wherein: N represents the air horsepower of water pump, the parameter under corresponding respectively expression operating conditions of kW, subscript e and s and the design conditions; N represents the rotating speed of water pump under the different frequency.
According to above-mentioned frequency conversion similitude theorem, analyze list item from the power frequency running pump operating characteristic that steps A 1 is set up, according to formula (2); Calculate at first respectively, in the power frequency specificity analysis, each given discrete operating point; The value of the lift under the pairing frequency condition, flow and air horsepower; Then successively according to steps A 1 in, identical way constructs under all frequency conditions; Each self-corresponding explicit model of lift and flow, efficient and flow and air horsepower and flow, record and the roadability of analysis water pump under different frequency.
Among the present invention, the foundation in said water pump characteristic model storehouse comprises the foundation in water pump power frequency roadability model base, pump variable frequency roadability model, pump sets in parallel operation characteristic model storehouse; The construction of whole water pump pump group roadability model base is the analysis with all types water pump; Be based upon the notion of autonomous proposition all; And on the explicit analytical model basis of autonomous Design; Accomplish analytic record through the model base technology, store with the table page or leaf form of correspondence to dissimilar water pump characteristics.On the basis of relevant software and hardware, this system can directly adopt technology of Internet of things, to form the mechanism of expedition pump group roadability and operational energy efficiency service.
Among the present invention, the foundation of said water pump power frequency roadability model base comprises that lift and flow display model, efficient and air horsepower are with the foundation of the explicit model of changes in flow rate under the power frequency condition; The process of the foundation of lift and flow display model comprises under the said power frequency condition: according to the parameter value of given water pump power frequency characteristic serial variance; Said parameter comprises lift and the flow on the corresponding operating point, based on method of least squares utilization numerical fitting technology original discrete feature curve negotiating is had enough high-precision interpolation polynomial then and carries out the explicitly description.
Among the present invention; The foundation of said pump variable frequency roadability model is according to the frequency conversion similitude theorem; Be the basis with said water pump power frequency roadability model base; Determine the value of lift, flow and air horsepower under the respective frequencies condition, and then construct lift and flow, efficient and flow and air horsepower and each self-corresponding explicit model of flow under the different frequency condition.
Among the present invention; Said changeable operating mode mutually down; The pipe network actual operating mode is put confirming of pairing similar operating condition point, is the method according to the nonlinear equation rooting, is the basis with constructed water pump (pump group) power frequency characteristic model; In conjunction with the definition of similar operating condition point, construct the method that frequency conversion similar operating condition point partly approached in interval minute.
Among the present invention; The foundation in said pump sets in parallel operation characteristic model storehouse is with pairing single pump water pump power frequency roadability model base and the pump variable frequency roadability model principle according to stack, constructs the explicit model of specifying water pump lift and flow under the various combination condition; Efficient and air horsepower are then carried out the analysis of unit.
This method and information system have two additional functions: 1) water pump maintenance needs feedback; Monitoring Data with to pump group continuous service characteristic and operational energy efficiency is the basis, under same frequency condition, with the variation of the water pump operation efficiency foundation as water pump operation condition diagnosing and evaluation; Then; Data analysis based on the foundation of water pump under water pump characteristic model storehouse and the changeable operating mode and water pump pump group operational energy efficiency model; The special parameter of water pump under the corresponding operating mode and the value of operational energy efficiency and analysis are compared; If the former continues to be lower than the value of analysis and presents the trend that continues to depart from, show that the water pump efficiency can't satisfy the demand.2) under the changeable operating mode, the operation that efficiently resets of water pump pump group; As previously mentioned, because main process receives the influence of market and environmental working condition, and circulating water flow process itself causes the polytrope and the complexity of circulating water flow process actual operating mode to the dependence that environmental working condition changes.
The information system of analyzing based on pump group efficiency provided by the present invention; According to its monitoring that various boundary conditions parameters are changed,, can be the actual motion of system according to algorithm provided by the present invention; According to the requirement of system high efficiency, operation fast resets under high efficiency condition.
The invention has the beneficial effects as follows:
The water pump of the industrial cycle water system described in the present invention and pump group efficiency analytical method can make user and manager intuitively objectively, control the roadability and the operational energy efficiency of water pump and pump group under the changeable operating mode in real time; Can make things convenient for user and manager according to water pump and pump group roadability data and operational energy efficiency model base, analyze the transition of the running state of specifying water pump system, as the direct foundation of water pump operation optimization; Can make user and manager under different operating modes,,, efficiently confirm the required running state of pump group according to pump operating characteristic data and operational energy efficiency model base and corresponding algorithm according to the variation of operating mode; Can make the operation of the long-range and monitoring pump group on the spot of user and manager.
The present invention sets up a kind of water pump pump group operational energy efficiency analytical model; And propose through setting up the foundation and the water pump characteristic model storehouse of water pump and pump group water pump characteristic model storehouse, water pump water pump pump group operational energy efficiency model; Thereby directly perceived, objective analysis, industrial circulating water system water pump and pump group operational energy efficiency information process analysis method.This method can combine with Internet technology, forms the remote service mechanism that pump group operational energy efficiency is analyzed.
The present invention at first provides has monitoring in real time of complicated coupling continuous parameters and the effective model of analyzing continuously; And under changeable operating conditions condition; On the basis to unit and the apparent roadability continuous monitoring of pump group, with the operational energy efficiency state of industrial circulating water flow process water pump assembly under the changeable operating mode of nondimensional form normalization ground description, and with its directly perceived, objective data support as process flow operation and optimization; Significantly reduce its dependence, just have great importance and be worth artificial experience.
Description of drawings
Fig. 1 is a circulating water pump group operational energy efficiency analytical method flow chart of the present invention;
Fig. 2 is single pump frequency conversion and power frequency parallel connection characteristic model plotted curve;
Fig. 3 is the single pump parallel connection characteristic model plotted curve when 90% frequency among Fig. 2;
Fig. 4 is the parallel connection characteristic model plotted curve when being 80% frequency of the single pump among Fig. 2;
Fig. 5 is the parallel connection characteristic model plotted curve when being 70% frequency of the single pump among Fig. 2;
Fig. 6 confirms frequency conversion similar operating condition point algorithm flow chart for interval halving among the present invention.
Embodiment
The present invention is directed to the industrial circulating water flow process; Propose and be based upon complicated water pump assembly operational energy efficiency status monitoring model and mechanism under the changeable operating mode; Application data base technology, technology of Internet of things; Realization is carried out monitoring with long-range operational energy efficiency on the spot to water pump assembly, and passes through interactive interface with user friendly management of the form of chart and analysis, also can be used as the data judging of running Optimization and the foundation of system's long-time running maintenance.The water pump operation efficiency being continued to monitor on the basis of analysis, under the working condition of correspondence, establish the data basis for carrying out of high usage group control techniques, the present invention simultaneously also proposes the notion that water pump assembly rapidly and efficiently resets and moves under the changeable operating mode with regard to this point.
Body matter of the present invention is following:
A, water pump characteristic model storehouse are set up;
Water pump is from its DESIGNED FEATURE; Flow principle of similarity (geometric similarity, kinematic similarity and dynamic similarity) of being based on of adopting itself; On the basis of experiment, amplify correction; Provide the experimental features curve of water pump of the same type, as the judgement basis of water pump parameter and characteristic in the actual moving process.Under existing design system, design margin and design side the design safety surplus that the type selecting of water pump proposes the user for guaranteeing that institute's design system direct motion is possessed, this double factor all impels pump selection excessive.Actual running, this excessive type selecting are the basic reasons that causes the system capacity waste.Along with the development of converter technique, in order to improve the operational efficiency of system, pump variable frequency has become the first-selected power save mode in great majority operation side in the actual moving process.
Carrying out of corresponding pump variable frequency has two problems to need to answer.One of which; How to provide for its frequency conversion characteristic of given water pump? Water pump given characteristic curve be that lift, efficient and air horsepower change corresponding relationship with pump capacity under the power frequency condition, thisly concern that itself is normally based on the non-explicit curve of series of discrete data.Can only read each item Operational Limits under the corresponding operating mode through the corresponding characteristics curve during operation, generally be difficult in control, directly adopt these data.Its two, change under the operating mode in many water pump parallel connections and complicated parallelly connected conversion process, how can the roadability of water pump group and separate unit water pump just carry out high-precision explicit analysis, to satisfy the demand of operation side to the pump operating characteristic control?
These two problems; In traditional water pump monitoring system, can't intuitively, objective provide answer; Operation side even can't control the running state of water pump in the actual moving process in other words; Fully whether the process parameter of but often only being concerned about output the operation of safeguards system, and this is the extensive management mode that is unfavorable for water pump operation optimization.
The present invention's explicit analytic angle of pump operating characteristic under the changeable operating mode; The application parameter fitting technique has made up the pump operating characteristic analytical model; And application model storehouse technology, technology of Internet of things and modern control technology are that the analysis of water pump operation state has at first made up the water pump characteristic model; Purpose is to use the family to reach on the spot the variation of interactive monitoring pump operating characteristic in time long-range, and carries out the historical analysis of pump operating characteristic according to this model base.
Embodiment: the elementary process that water pump characteristic model storehouse and water pump characteristic model storehouse are set up is following:
A1. water pump characteristic model storehouse is set up;
Step 1: power frequency running pump operating characteristic is analyzed the foundation of list item;
The foundation of power frequency operation specificity analysis model and corresponding list item is under the changeable working condition, the basis of water pump unit operation and water pump group analysis on Operating.In the information system, the foundation in water pump characteristic model storehouse is based upon on the pump operating characteristic model based.So at first need to set up the explicit model of water pump power frequency analysis on Operating.In the actual moving process, the analysis of pump operating characteristic is through some known parameter, comes according to the model of being set up, and directly explicitly provides corresponding other special parameter, and recording occurring continuously with show that dynamically this is the function that original water pump supervisory system does not possess.
1. the foundation of lift and flow display model under the power frequency condition
At first according to the parameter of given water pump power frequency characteristic serial variance---the lift on the corresponding operating point, the value of flow; Based on method of least squares utilization numerical fitting technology original discrete feature curve negotiating is had enough high-precision interpolation polynomial and carry out the explicitly description; Polynomial exponent number is chosen as three times; Promptly provide the characteristic of serial system through cubic interpolation multinomial dominance under sufficiently high precision; With the example that is changed to of flow and lift, polynomial approximate model formula of cubic interpolation such as formula (1) are arranged:
Wherein: H is a pump head, m;
Q is a volume flowrate, m
3/ s;
A, b, c, d are when adopting the method for least squqres match, the undetermined coefficient of corresponding approximate multinomial fitting formula.The roadability of separate unit water pump just can obtain the real-time monitoring of explicit form like this.The foundation of water pump power frequency service performance model can make the user in the continuous running, after measuring flow, just can directly determine the lift of water pump under this operating mode from above-mentioned model.
Discrete operating point in the characteristic model, general manufacturing firm can provide, shown in the discrete operating mode of Fig. 2 unit power frequency.When having provided certain type water pump unit power frequency running among Fig. 2; The curve that lift-Flow characteristics model is corresponding, and when Liang Tai and three homotype water pump parallel runnings, the curve of corresponding explicit model; As can be seen from the figure; The model of fit curve has very high precision, the roadability of combination portrayal water pump.
2. efficient is with the foundation of the explicit model of changes in flow rate;
Adopt the same steps as of setting up with lift discharge relation model; Value according to the discrete operating mode of correspondence; Also can intuitively provide under the power frequency operating condition; The approximation polynomial model that pump efficiency changes with pump capacity, thus intuitive analysis goes out under corresponding flow and the lift condition efficient of water pump such as formula (2);
In the formula:
is when turning round for power frequency; Under the corresponding flow condition, the operational efficiency of water pump;
then is the undetermined coefficient of corresponding explicit model.For this model, can intuitively show under the different flow condition variation of water pump efficiency.
3. pump shaft power is with the foundation of the explicit model of changes in flow rate;
Adopt the same steps as of setting up with lift discharge relation model; Value according to the discrete operating mode of correspondence; Also can intuitively provide under the power frequency operating condition; The approximation polynomial model that pump shaft power changes with pump capacity, thus intuitive analysis goes out under corresponding flow and the lift condition air horsepower of water pump such as formula (3).
In the formula:
is when turning round for power frequency; Under the corresponding flow condition, the operation air horsepower of water pump;
then is the undetermined coefficient of corresponding explicit model.For this model, can intuitively show under the different flow condition variation of water pump operation air horsepower.
In the said process, in the corresponding list item in that model input model storehouse, can be according in the actual moving process, the variation of flow and lift intuitively provides other Operational Limits of water pump, and with the form of chart, in real time and obtain analysis continuously.
Step 2: the foundation of pump variable frequency analysis on Operating list item;
Along with the continuous development of converter technique, adopt the mode of energy-saving and frequency-variable to move, become the basic selection of water pump actual motion.And change of frequency must cause the servo-actuated of pump operating characteristic, the analysis of this characteristic variations and demonstration, and for the control of whole circulation current journey characteristic, its meaning is very tangible.So in the water pump characteristic model storehouse notion that the present invention proposes, under the different frequency condition, pump operating characteristic is the important list item data of model base.The phase analysis also is to be based upon on the basis of explicit model.
In the actual moving process, the analysis of frequency conversion characteristic generally according to the similarity relation of frequency conversion, serves as the basis and launches according to following relation (4) with the power frequency operation characteristic:
Wherein: N represents the air horsepower of water pump, the parameter under corresponding respectively expression operating conditions of kW, subscript e and s and the design conditions; N represents the rotating speed of water pump under the different frequency.
1. pump variable frequency specificity analysis
According to above-mentioned frequency conversion similitude theorem, the water pump power frequency characteristic model of setting up from the first step is according to relation (4); Calculate at first respectively; In the power frequency specificity analysis, each given discrete operating point, the value of the lift under the pairing frequency condition, flow and air horsepower.
Then successively according to step 1 in; Identical way; Construct under all frequency conditions each self-corresponding explicit model of lift and flow, efficient and flow and air horsepower and flow, thereby the roadability of water pump under different frequency of objectively analyzing directly perceived.Set up the difference of process with explicit model in the step 1, be that just the motor rotation frequency changes after, corresponding discrete data point is according to relation (4) variation that corresponding relation produced.
In the modal analysis process, on above-mentioned model based, can carry out suitable simplification; As can provide frequency (rotating speed); When fixedly rule changes according to certain, the coordinate diagram of corresponding model, application graph processing capacity; Make the user can estimate under the corresponding operating mode roadability of water pump fast.
The discrete operating point of frequency conversion and model of fit curve, and Liang Tai and three parallel-connected pumps frequency conversion characteristics, respectively at Fig. 2 in Fig. 4, provided intuitively and to have shown.
As example, in rational frequency conversion scope, the complicated converting operation characteristic of water pump under the optional frequency and pump group all can highi degree of accuracy intuitively provide objectively.
2. the confirming of water pump similar operating condition point flow during the pipe network damping change
In the actual moving process; Because the change of main flow loading intensity and environmental working condition; User institute water requirement must change, thereby for given pipe network system, it all can change along journey and local resistance; The waterpower state of the corresponding pipe network system of circulating water pump system changes, thereby the required pressure head of given pipe network must change.In reasonable range, efficiently move for making the circulating water flow process, frequency conversion is first-selected method.
This situation is the lift and the flow of known pipe network often, needs the similar operating condition point of confirming that frequency conversion is corresponding.
Frequency conversion is with similarity relation formula (4); On with the water pump power frequency running explicit model basis of setting up; Need to confirm to put corresponding similar operating condition point with the pipe network actual conditions; This operating point must satisfy two condition one of which, must on water pump power frequency flow-lift model curve of being set up, promptly must satisfy formula (1); Its two, must and the pipe network operating point between have similarity relation formula (4), the present invention confirms for similar operating condition point, has set up the method that interval branch partly approaches.
At first through given pipe network operating point information, required lift and flow make up desirable pipe network curve, and mode is seen relation (5):
Wherein K is desirable pipe network damping constant, and relation (5) has been guaranteed the establishment of frequency conversion similarity, and the intersection point of this curve and main frequency water pump flow-lift model curve of being set up is through frequency conversion and realizes the similar operating condition point that the pipe network operating mode is corresponding.
The similar operating condition point is the intersection point of two nonlinear curves, and in order can in analytic process, to programme and to confirm this similitude, the present invention has designed interval branch half approximatioss, at first makes up nonlinear equation (6)
Certainly, in real process, its variation is carried out to the parallel-connected pumps group, and corresponding water pump model is the pump group model, also can directly disassemble confirming into single pump similar operating condition point.Confirm according to the logic diagram flow process among Fig. 6, to confirm the value of pump capacity under the corresponding lift under the condition of initial value that this is during the traditional water pump characteristics is analyzed, not available function rationally.Among Fig. 6; The convergence principle of interval bisection algorithm is; In the trial calculating process of adjacent twice flow; The difference of the value of corresponding twice flow should be lower than and think certain precision value
of setting (
for certain greater than zero little arithmetic number).
In the corresponding diagram 6, confirm that the elementary process of frequency conversion similar operating condition point flow process is following:
Before confirming to carry out; Confirm that known data comprise; The water pump power frequency roadability model curve of being set up, actual operating mode point and from the actual operating mode point, the pipe network idealized characteristic that obtains; The amount of confirming is transferred the intersection point of curve, and corresponding is the rooting process of nonlinear equation (6).
Shown in block diagram; At first in rational initial value scope; Read in a selected data on flows
of attempting
Value with
is brought in the nonlinear equation (6); The value of judging
; If this value levels off to zero in certain accuracy rating; Then represent the trial flow value of getting; Be the characteristic point of desiring to look for; Export its value, otherwise carry out next step;
Adopt under second trial flow
condition setting; The value of
; If
arranged; Then represent the similitude that will inquire about; Not on
interval; Value that need reset
and interval scope; Otherwise similitude is on
interval;
Putting before this; Make
; Replace original
value; Between this stylish interrogation zone; Size is the half the of a last trial interval size, promptly interval the branch partly;
The symbol of judging
once more; If should be worth less than zero; Then the interval further contracts half; Otherwise make
, carry out the interval operation partly that divides;
So continue to attempt half inquiry of interval branch; Up to
; Set till the convergence precision; The flow that finally makes institute's desire inquiry similitude is for
; Inquiry stops, the flow information of output similitude.
The distortion of this method also comprises the method for looking for one's roots according to the nonlinear equation of other type, confirms the circulating water pump actual operating mode.
Water pump power frequency operating characteristic analysis for according to the regulation and control of exit of pump valve all can adopt above-mentioned two basic steps, carries out the specificity analysis of water pump unit power frequency operation.
Step 3: the foundation of water pump parallel connection and parallelly connected frequency conversion specificity analysis list item
Identical with step 2 with abovementioned steps 1, this list item also is to be based upon on the corresponding explicit model basis.In the actual moving process, corresponding different process flow process, many water pumps parallel connections, pump cohort control operation method are generally all adopted in the operation of water pump.The complexity of this method is to have the different combinations mode, like frequency conversion multiplex (MUX) frequency, many frequency conversions simultaneously, not even parallel connection of the water pump of same model and frequency conversion parallel connection etc.Under the different parallelly connected conditions, pump operating characteristic differs greatly, and intuitively provides objectively under the various combination mode, and the model of pump group analysis on Operating also has very important significance.
The characteristic that the water pump parallel connection embodies is, corresponding pipe network node place, and the pressure that water pump provided (lift) value is identical, and flow adopts the method for stack.
The roadability of water pump various combination mode; Then be under the principle of this stack, in step 1 and step 2, water pump unit power frequency of being set up and converting operation model; Come deployment analysis item by item; Promptly set up respectively under the parallelly connected condition, pump group lift, efficient and air horsepower are with the display model of changes in flow rate.
The foundation of corresponding model is adopted with the identical algorithm of step 1 and is carried out, and can intuitively construct the appointment water pump, the explicit model of lift and flow under the various combination condition.Just corresponding discrete point is the operating point by unit operation, and is identical according to the corresponding node pressure head, flow mutual superposition and the discrete point that forms.This has all obtained demonstration at Fig. 2 intuitively in Fig. 5.
For the technological process of appointment, the combined running strategy of its water pump pump group, the form of variation is just very limited; Just the variation of data is comparatively numerous and diverse; Can adopt above-mentioned 3 steps, make up its corresponding analysis on Operating model, and adopt modern model storehouse technology; Produce corresponding list item and figure, to launch intuitive analysis.
Step 4: the foundation in water pump characteristic model storehouse;
For quick and precisely carrying out of water pump operation analysis, obviously can set up to all types water pump, thereby the present invention proposes the notion of setting up water pump characteristic model storehouse.
This is the novel concept that the present invention proposes; Can the explicit model of dissimilar pump operating characteristics be relied on modern model storehouse technology, build up water pump characteristic model storehouse with different table page or leaf; According to the process flow diagram that the user provided, directly select and deployment analysis.
Fig. 2 shows single pump frequency conversion and power frequency parallel connection characteristic model plotted curve, and Fig. 3 is the single pump parallel connection characteristic model plotted curve when 90% frequency among Fig. 2; Fig. 4 is the parallel connection characteristic model plotted curve when being 80% frequency of the single pump among Fig. 2; Fig. 5 is the parallel connection characteristic model plotted curve when being 70% frequency of the single pump among Fig. 2; Provided the parallelly connected characteristic of power frequency characteristic, unit frequency conversion characteristic, power frequency of the flow lift of certain type water pump, the explicit analysis result of part of frequency conversion parallel connection characteristic, the curve among the figure all is to have the corresponding curve of explicit polynomial model.Other characteristic with flow, the efficient variation characteristic with flow, also can construct corresponding explicit model through above-mentioned mode like power, makes things convenient for the user of each side according to the actual requirements, the characteristic of coming dynamic analysis water pump itself to move.
For the analysis of same type pump operating characteristic, can form different data table items, data page and data volume, and dissimilar water pumps has separately and binds into book form.For the parallel connection of different water pumps combination, be nothing but according to parallelly connected rule and above-mentioned each step, carry out one by one and with.
Under corresponding operating mode; The user can obtain needed water pump operation values of parameters fast according to Model of pump, pump stack features and the roadability (like several parallel connections, frequency value) of oneself; And can be on the graph of a correspondence interface; Obtain dynamic demonstration the directly perceived, and can adopt modern technology of Internet of things, carry out the teletransmission of data.
The construction in The model storehouse is with all explicitly designs of analysis of all types water pump, through modern model storehouse technology, accomplishes the analytic record to dissimilar water pump characteristics then, stores with the table page or leaf form of correspondence.During operation, the user can make the user come appropriate the selection according to the demand of oneself through corresponding interactive interface, and is objectively directly perceived in real time, with discrete data, continuous modes such as chart, monitors the roadability of corresponding water pump and pump group.This point has directly changed traditional monitoring mode, can't intuitively objective analysis different running method and operating mode under, the situation of water pump and pump group roadability, and be follow-up water pump operation optimization has been established the data basis of basic aspect.
The foundation of water pump and pump group operational energy efficiency model base under B, the changeable operating mode;
How is the operational energy efficiency of water pump judged? Water pump operation itself is the energy that electric energy is converted into propulsive fluid work through rotating machinery; The monitoring of its operational energy efficiency is to judge under the working condition of reality, to have how many electric energy effectively to be converted into the demonstration directly perceived of available energy, has crucial effects for the analysis of water pump operation state under the changeable operating mode.For water pump; The operational efficiency of its traditional sense needs the efficient of tracking motor own and pump efficiency and the comprehensive parameters of transmission efficiency therebetween, but these basic compositing factors in real process because the polytrope of operating mode often can't provide analysis result intuitively.This that is to say, even made the basic roadability of water pump clear through explicit characteristic model, but still can't provide the intuitive analysis of water pump operation efficiency under the corresponding operating mode.
Step 5: the integration of pump group efficiency unit;
The analytical method that the present invention breaks traditions proposes the corresponding technological process of being studied, and whole water pump pump group (motor and the pump housing) is used as a complete efficiency unit, carries out the analysis of operational energy efficiency.Certainly, for any one single pump, also can carry out the analysis of single intuitively pump operation efficiency.
Step 6: the foundation of water pump unit operation efficiency model;
Motor is under different rotating speed, and from total electric energy of input end input, as the total energy of this efficiency unit, the primary water geopotential energy sum of exit of pump sound pressure head and lifting is as effective output energy of system.Generally speaking, for given pipe network system, elementary water level is a definite value basically, and the variation of flow directly causes the variation of initial water level potential energy.
Power factor under the corresponding rotating speed is cos Φ, and power input to machine does
（7）
In the formula;
is under the respective frequencies; The voltage and current of motor, these two parameters generally all have Monitoring Data intuitively.
then is power input to a machine.
The effective output of water pump does
In the formula;
is the density of cycle fluid,
;
is gravity accleration,
;
flow for measuring,
;
required head of pipe network,
;
pipe network characteristic static pressure head; The water pump pressure head,
;
exit of pump pipeline sectional area,
.
The operational energy efficiency that then defines water pump in the running does
Above in the constructed analysis system about the water pump operation efficiency; The power factor of different rotating speeds property motor then need be confirmed with the relation of rotation speed change according to the phase deviation of correspondence; This also can be from given discrete data; Provide the variation model of continuous approximate explicit power factor, thereby the operational energy efficiency of corresponding water pump can provide by explicitly.
The key character of this model is, under the changeable operating mode, and monitoring and analysis that single pump operation efficiency changes
Step 7: the foundation of pump group operational energy efficiency model
The operating pressure that adopts house steward and flow be as molecule, and the air horsepower that will participate in moving water pump superposes and calculates the operational energy efficiency of entire pump group as denominator.
The introducing of this notion is that whole water pump pump group is thought of as an efficiency unit, and does not distinguish electric efficiency, pump efficiency and transmission efficiency, is the direct embodiment of water pump overall operation efficiency.
Corresponding parameters all directly can be surveyed or can directly provide, and this makes the demonstration directly perceived of water pump operation efficiency become possibility.Under same frequency condition, the variation of water pump operation efficiency can be used as the organic composition of water pump operation condition diagnosing and evaluation.
Step 8: the foundation of water pump and pump group operational energy efficiency model base
To the water pump and the pump group of specifying model,, make up operational energy efficiency data table items and table page or leaf according to the operational energy efficiency model of correspondence; For different model water pump and corresponding combination and frequency conversion form thereof; Different table pages or leaves can form the foundation of water pump and water pump pump group operational energy efficiency model, and the icon instrument in application model storehouse can form the graphical interfaces of corresponding states water pump and pump group operational energy efficiency; This interface form can adopt the mode of coordinate graphic, and the operational energy efficiency of corresponding operating point is intuitively shown.
C, water pump and the operation of pump group and operational energy efficiency specificity analysis are used
Step 9: water pump operation efficiency diagnosis
Cooperate corresponding roadability values of parameters, can be used to jointly judge whether water pump needs maintenance.If corresponding characteristics parameter and operational energy efficiency all continue to be lower than the value that above-mentioned theory is analyzed under corresponding operating mode, and when presenting the trend that continues to depart from, water pump self need obtain safeguarding that concrete threshold value then need be confirmed according to the type of water pump.Above-mentioned two demonstrations directly perceived, objective of analyzing data provide strong data to support for the user controls the water pump operation state.
D, based on the water pump of the water pump operation efficiency analysis operating mechanism that efficiently resets;
In the actual moving process; Because the polytrope of corresponding technological process loading intensity and environmental working condition; In order to improve the operational efficiency of water pump; The team control technology of water pump pump group that a lot of water pump operations have been optimized process using according to the change of flow process loading intensity and environmental working condition, is carried out the control of water pump operation platform number and frequency.But owing to lack the control directly perceived to pump operating characteristic and efficiency analysis, this adjusting often all has strong dependence to artificial experience.How to make water pump under changeable operating mode, select efficient Operational Limits (frequency, platform number, flow, lift) fast, operation obviously has very important significance efficiently.On the basis of pump operating characteristic and operational energy efficiency historical analysis data, for a brand-new road has been opened up in the operation that efficiently resets of system.
Step 10: the selection of the reference point that efficiently resets;
For the different processes flow process, flow process loading intensity and environmental working condition change according to market and regional feature.Generally speaking, though this change procedure can not fully periodically repeat, also have certain quasi-periodicity characteristic, this is when running in water pump operation strategy quasi-periodicity, and certain basis has been established in resetting fast of water pump parameter;
In the tradition regulation and control, artificial experience is presented as on this basis, under what loading intensity and environmental working condition, opens how many platform water pumps, and under which kind of frequency, moves, and artificial experience places one's entire reliance upon.Different experiences shows the difference of water pump efficiency, causes system effectiveness and energy consumption difference huge;
And water pump characteristic model storehouse that the present invention set up and operational energy efficiency model base can be recorded in the model base by the various conditional parameters that water pump operation is corresponding;
During actual motion,, be reference with loading intensity and environmental working condition according to the historical data of water pump operation and present demand; Employing data sorting technology; Choose four reference points that reset, make the operating point of present operation, be in the interval of selected four reference points that reset; And read corresponding reference point, the method for operation of water pump and corresponding characteristics parameter.
Step 11: the confirming of pump operation actual conditions point;
Generally speaking, actual operating mode point is difficult to overlap fully with historical operating mode, so after reference point is selected to finish, need will intend under the operation frequency Operational Limits of water pump according to specificity analysis model of being set up and operational energy efficiency model;
In four operation reference points, be in running operating point upper right (flow and lift are all greater than desirable value) benchmark and be decided to be the basis, the Operational Limits that adopts this operating point is a benchmark; Confirming of this benchmark; Purpose is on the basis that guarantees the direct motion of flow process safety, confirms the initial value of the corresponding water pump operation condition of actual conditions fast, and this value is under the base condition of setting; The water pump operation operating mode, quite approaching with required operating point.
When operating conditions changes, make the initial launch frequency when adjusting that is optimized of water pump, the frequency corresponding from the benchmark operating point begins, according to certain change of frequency amplitude; Progressively reduce earlier the frequency of water pump, according to the special pattern type of the water pump of being set up (pump group) operation, monitor the variation of pump operating characteristic in real time simultaneously, be in the left bottom of required operating point in case find the frequency conversion operating point; Be that flow and lift all are lower than in required operating point gets,, carry out the raising frequency operation then according to half value of setpoint frequency amplitude of variation; If after the operation, the water pump operation operating point is when being in the upper right of required operating point again; Then press the half the of current change of frequency amplitude, reverse frequency conversion so can progressively approach required actual operating mode; Finally, when the water pump operation operating point, in the upper right; With certain precision, during fully near the required operating point of pipe network, the variation of stop frequency.
This method carry out the direct motion that both guarantees technological process, make water pump operation put the at utmost operating conditions of closing to reality again, be the method for the efficient operating mechanism of a kind of quick structure water pump; Certainly; Carrying out of its operation must depend on optimizing operation history data, pump group water pump characteristic model storehouse that this depends on the present invention is again set up and operation ability mini Mod storehouse; In this process, the method for operation of final water pump also is as the criterion with the corresponding method of operation of upper right reference point.
Claims (5)
1. the pump group operational energy efficiency analytical method of an industrial cycle water system is characterized in that:
This method comprises the structure in water pump characteristic model storehouse and the foundation of water pump and pump group operational energy efficiency model base; The foundation of said water pump and pump group operational energy efficiency model base comprises: at first be based on the integration of pump group efficiency unit; Be about to whole water pump and comprise that the motor and the pump housing be used as a complete efficiency unit; Propose water pump and pump group operational energy efficiency coefficient and model, based on this, launch the analysis of single pump operation efficiency; Carry out the foundation of water pump pump group operational energy efficiency model then, concrete steps are following:
The structure in A, water pump characteristic model storehouse;
The foundation of A1, main frequency water pump analysis on Operating list item;
1) the real-time monitoring and the analysis of single pump power frequency operation characteristic
Based on the power frequency special parameter of specifying water pump to provide; Based on method of least squares, independently make up the demonstration continuous approximation model of water pump power frequency running, make the user can be directly according to the flow that is read; Judge the value of its corresponding lift, efficient and air horsepower; And utilize graphical interfaces technology, and intuitively be presented on the corresponding runnable interface of water pump identity server with in fact the time, monitor the change of running operating point in real time through this interface;
The foundation of A2, pump variable frequency analysis on Operating list item;
Under the different frequency condition, specify the similarity law of pump operating characteristic, in rational frequency conversion scope, can direct given different operating frequencys under, the continuous analytical model of pump operating characteristic;
The foundation of the analysis list item of A3, water pump parallel connection and parallelly connected frequency conversion characteristic;
Many water pump parallel connections are all adopted in the operation of water pump, pump cohort control operation method, and corresponding pipe network node place, the pressure that water pump provided (lift) value is identical, and flow adopts the method for stack; In step 1 and step 2, water pump unit power frequency of being set up and pump variable frequency analysis on Operating list item come deployment analysis item by item, promptly set up respectively under the parallelly connected condition, and pump group lift, efficient and air horsepower are with the display model of changes in flow rate;
The foundation of corresponding model is adopted with steps A 1 identical algorithm and is carried out, and can intuitively construct the appointment water pump, the explicit model of lift and flow under the various combination condition; Just corresponding discrete point is the operating point by unit operation, and is identical according to the corresponding node pressure head, flow mutual superposition and the discrete point that forms;
The foundation of B, water pump and pump group operational energy efficiency model base: to the water pump and the pump group of specifying model; Operational energy efficiency model according to correspondence; Make up operational energy efficiency data table items and table page or leaf, for different model water pump and corresponding combination and frequency conversion form thereof, different table pages or leaves can form water pump and pump group operational energy efficiency model base; The icon instrument in application model storehouse; Can form the graphical interfaces of corresponding states water pump and pump group operational energy efficiency, this interface form can adopt the mode of coordinate graphic, and the operational energy efficiency of corresponding operating point is intuitively shown;
B1: the establishment of pump group efficiency unit
Whole water pump pump group is used as a complete efficiency unit, carries out the establishment of operational energy efficiency;
B2: the foundation of water pump unit operation efficiency model;
Motor is under different rotating speed, and from total electric energy of input end input, as the total energy of this efficiency unit, the primary water geopotential energy sum of exit of pump sound pressure head and lifting is as effective output energy of system; Generally speaking, for given pipe network system, elementary water level is a definite value basically, and the variation of flow directly causes the variation of initial water level potential energy;
B3: the foundation of water pump pump group operational energy efficiency model
Whole water pump pump group is thought of as an efficiency unit, carries out the analysis of operational energy efficiency.
2. the pump group operational energy efficiency analytical method of industrial cycle water system according to claim 1 is characterized in that:
It also comprises the efficient reset mechanism step of water pump operation,
C1, efficiently the reset selection of reference point;
During actual motion,, be reference with loading intensity and environmental working condition according to the historical data of water pump operation and present demand; Employing data sorting technology; Choose four reference points that reset, make the operating point of present operation, be in the interval of selected four reference points that reset; And read corresponding reference point, the method for operation of water pump and corresponding characteristics parameter;
Confirming of C2, pump operation actual conditions point;
In four operation reference points; Characteristic model and efficiency model; With the Operational Limits of intending water pump under the operation frequency, being decided to be the basis from the upper right benchmark of performance diagram, to adopt the Operational Limits of this operating point be benchmark, makes the water pump operation point can be with the operating conditions of the fastest speed closing to reality.
3. the pump group operational energy efficiency analytical method of industrial cycle water system according to claim 1 and 2 is characterized in that:
In the foundation of said step B2 water pump unit operation efficiency model;
Power factor under the corresponding rotating speed is cos Φ, and power input to machine does
In the formula;
is under the respective frequencies; The voltage and current of motor, these two parameters generally all have Monitoring Data intuitively;
then is power input to a machine;
The effective output of water pump does
In the formula,
is the density of cycle fluid;
is gravity accleration;
flow for measuring;
required head of pipe network;
pipe network characteristic static pressure head;
exit of pump pipeline sectional area;
The operational energy efficiency of definition actual moving process water pump unit is:
In the foundation of said step B3 water pump pump group operational energy efficiency model
In the definition actual moving process, the corresponding operational energy efficiency of the complicated pump group method of operation is:
4. the pump group operational energy efficiency analytical method of industrial cycle water system according to claim 3 is characterized in that:
During said steps A 1 main frequency water pump analysis on Operating list item was set up, corresponding approximate power frequency characteristic model existed with following form, and the variation through flow can directly provide the pump operating characteristic values of parameters;
Wherein Q, H, η and N are respectively flow, lift, efficient and the air horsepower of water pump, and
is by being set up value corresponding undetermined coefficient in each model.
5. the pump group operational energy efficiency analytical method of industrial cycle water system according to claim 4; It is characterized in that: during said steps A 2 pump variable frequency analysis on Operating list items are set up; The analysis of frequency conversion characteristic; Generally according to the similarity relation of frequency conversion, serve as the basis and launch according to following relation with the power frequency operation characteristic:
Wherein: N represents the air horsepower of water pump, the parameter under corresponding respectively expression operating conditions of kW, subscript e and s and the design conditions; N represents the rotating speed of water pump under the different frequency.
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