CN102535583A - Method for collocating constant-pressure dispersed variable-flow cluster type water pumps - Google Patents
Method for collocating constant-pressure dispersed variable-flow cluster type water pumps Download PDFInfo
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- CN102535583A CN102535583A CN2011103977005A CN201110397700A CN102535583A CN 102535583 A CN102535583 A CN 102535583A CN 2011103977005 A CN2011103977005 A CN 2011103977005A CN 201110397700 A CN201110397700 A CN 201110397700A CN 102535583 A CN102535583 A CN 102535583A
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Abstract
The invention relates to a method for collocating constant-pressure dispersed variable-flow cluster type water pumps. The method comprises the following steps: 1) determining a change rule of dispersed flow working conditions; 2) setting optimal flows of three types of water pumps; 3) starting corresponding water pump combinations according to different dispersed flow requirements; 4) setting the optimal performance index according to the principle of minimum total water supply error; 5) nonlinearly optimizing problem and solving undetermined optimal flows of the three types of water pumps; 6) collocating the water pumps according to the optimal flows; and 7) constructing a constant-pressure dispersed variable-flow high-efficient cluster type water pump system, connecting the three water pumps with three motors and three control valves, and collocating a PLC (Programmable Logic Controller) control unit, a full-voltage bus, three soft starters and three alternating current contactors. The method has the advantages that the method can meet the change demand of seven flow working conditions; the deviation between a rated power supply volume and the actual demand is small; the water pumps can run in a high-efficiency section; the energy-saving effect is excellent; an adjusting device and a frequency converter are unnecessary in the whole system; the one-time investment is low; the cost performance of the whole system is high; few equipment is used; the reliability is high; big and small water pumps are both considered; flexible scheduling is realized; and the most economical collocation is realized.
Description
Technical field
The present invention relates to the cluster type water pump collocation method of the discrete unsteady flow amount of constant voltage of water system.
Background technology
Industrial and mining enterprises' water supply volume normally year by year, month by month, day by day, change by time ground; Yet most of enterprise water system often adopts the way of supplying water that satisfies the maximum stream flow demand to supply water; The superfluous phenomenon of metalling run out that supplies water often occurs, so not only cause the waste of water resource and power, head loss is relevant with the water supply volume size in the pipeline simultaneously; The efficiency of pump reduces greatly, often causes the very big waste of electric energy again.To complicated supply and drain water system, pertinent literature discloses by many water pumps and many team control water pump systems that frequency converter is formed, and pump group switching mode is realized position formula control according to water demand; Flow can be realized regulating continuously through frequency conversion; Solve the water resource waste problem to a certain extent, improved system effectiveness, but also have following problem: (1) whole system configuration frequency converter is more, and the frequency converter price is high; One-time investment is big, and the whole system cost performance is low; (2) equipment is more, and control is complicated, and reliability reduces; (3) the parallel connection of pumps working method of employing same model can't accomplish that size is taken into account, flexible dispatching.
Summary of the invention
The present invention is directed to the problems referred to above that the allocation plan of existing team control water pump system exists, provide a kind of according to operating mode enterprise water use amount Discrete Change rule and the cluster type water pump collocation method of the discrete unsteady flow amount of the constant voltage of reasonable disposition water pump platform number and metered flow.
Technical solution of the present invention is:
The water pump collocation method of the cluster type water pump system of the discrete unsteady flow amount of a kind of constant voltage, its special character is:
1) confirms discrete flow working conditions change rule
Arrange from small to large by flow, discrete flow operating mode and corresponding probability are expressed as respectively:
（Q1，P1）、（Q2，P2）、（Q3，P3）…（Q7，P7）
Q representes flow, unit: m
3/ hour, Q1<q2<<q7, P represent the probability that corresponding discharge occurs, P1+ P2+ ... P7=1; Give expression to greater than 3 kinds smaller or equal to the Changing Pattern of 7 kinds of discrete flow working conditions change through top expression formula: when P1～P7 is not equal to zero, represent 7 kinds of discrete flow operating modes; When P1～P7 has 3 to be zero, be expressed as 4 kinds of discrete flow operating modes; Other situation and the like;
2) optimal flux of three kinds of model water pumps of setting
Arrange from small to large according to metered flow; The optimal flux of three kinds of model water pumps is respectively: Qa, Qb, Qc; And satisfy Qa < Qb < Qc; If every water pump guarantees all that in running the various combination of three kinds of model water pumps produces following 7 kinds of flow operating mode: Qa, Qb, Qa+Qb, Qc, Qa+Qc, Qb+Qc, Qa+Qb+Qc with its optimal flux output under the certain lift of constant voltage, and satisfies following relation:
Qa<Qb<Qa+Qb<Qc<Qa+Qc<Qb+Qc<Qa+Qb+Qc；
3) start corresponding water pump combination according to the discrete traffic demand of difference
When the flow operating mode is Q1, start a pump, actual flow is Qa; When the flow operating mode is Q2, start the b pump, actual flow is Qb; When the flow operating mode is Q3, start a, b pump, actual flow is Qa+Qb; When the flow operating mode is Q4, start the c pump, actual flow is Qc; When the flow operating mode is Q5, start a, c pump, actual flow is Qa+Qc; When the flow operating mode is Q6, start b, c pump, actual flow is Qb+Qc; When the flow operating mode is Q7, start a, b, c pump, actual flow is: Qa+Qb+Qc;
4) by the minimum policy setting optimal performance index of total water supply error
5) nonlinear optimal problem is found the solution three kinds of model water pump optimal flux undetermined
Problem is converted into the following nonlinear constraint optimization that has:
The result who tries to achieve is:
Following formula is matrix operation, and [] is expressed as matrix, and index-1 representing matrix is inverted;
6) according to optimal flux value configuration water pump
Bring the data of seven kinds of discrete flows and corresponding probability thereof into following formula, obtain optimal flux Qa, Qb, the Qc of three water pumps, select the approaching parameter of optimum operating condition point as three water pumps of nominal parameter configuration;
7) the efficient cluster water pump system of the discrete unsteady flow amount of establishment constant voltage
Three water pumps are linked to each other with three control valves with three motor; Configuration PLC control module, total head bus, three soft starters and three A.C. contactors; Every motor connects the total head bus through the soft starter of parallel connection with corresponding A.C. contactor constant open contact respectively; The adhesive of soft starter and A.C. contactor constant open contact with break off through the control of PLC control module, the PLC control module is used for controlling the duty of corresponding soft initiator and A.C. contactor constant open contact and with corresponding starting mode of pump according to the flow operating mode.
The invention has the beneficial effects as follows: the occasion that is not suitable for discrete unsteady flow amount operating mode demand to traditional water pump allocation plan; Utilize discrete unsteady flow amount operating mode and Changing Pattern; The metered flow of reasonable disposition different model water pump also makes up the cluster type water pump system; Replace the single big capacity water pump of tradition, can satisfy the requirement of seven kinds of flow working conditions change.Compare with traditional allocation plan, specified output and actual demand amount deviation are very little, even do not add the Flow-rate adjustment measure; It is minimum that the water supply excess quantity can reach; If mix the Flow-rate adjustment measure again, actual flow conforms to demand, simultaneously; Water pump can also be in efficient section operation, and energy-saving effect is remarkable.In addition, also have following advantage: (1) whole system need not adjusting device and frequency converter, and one-time investment is few, and the whole system cost performance is high; (2) equipment is few, and reliability is high; (3) to greater than 3 kinds smaller or equal to the water system of 7 kinds of discrete flow working conditions change, adopts three kinds of different model water pump parallel operation modes, can accomplish that size is taken into account, flexible dispatching, the saving power cost, realize most economical configuration.Although the present invention is configured water pump for more kinds of operation conditions the reference value of having a mind to is provided to being configured water pump greater than 3 kinds smaller or equal to 7 kinds of operation conditions.
Description of drawings
Fig. 1 is the probability distribution graph of the discrete flow operating mode of cluster water pump water supply system of the present invention;
Fig. 2 is each water pump and the operating point distribution map of sundstrand pump under constant voltage thereof in the cluster water pump system of the present invention;
Fig. 3 is a starting mode of pump FB(flow block) of the present invention;
Fig. 4 is an assembly drawing of the present invention;
Fig. 5 is an electric hookup of the present invention.
Among the figure: 1-control valve, 2-control valve, 3-control valve, 4-reservoir, 5-user, 6-PLC control module; 7-total head bus, 8-soft initiator, a-water pump, b-water pump, c-water pump, M1-motor; The M2-motor, M3-motor, KM1-A.C. contactor, KM2-A.C. contactor, KM3-A.C. contactor.
The specific embodiment
Below in conjunction with instance the present invention is done detailed elaboration:
1) confirm discrete flow operating mode probability distribution (Q, P)
As shown in Figure 1, to arrange from small to large by flow, seven kinds of discrete flow operating modes and corresponding probability are respectively: Q1=50 m
3/ hour, Q2=140 m
3/ hour, Q3=200m
3/ hour, Q4=300 m
3/ hour, Q5=360 m
3/ hour, Q6=460 m
3/ hour, Q7=520 m
3/ hour; P1=0.0714, P2=0.2143, P3=0.1429, P4=0.2143, P5=0.0714, P6=0.2286, P7=0.0571,
Flux unit: m
3/ hour;
Discrete flow operating mode and corresponding outline distribute as shown in Figure 1;
2) optimal flux of three kinds of model water pumps of setting
Flow/the lift characteristic of each water pump and sundstrand pump thereof reaches distribution (" H "-lift among Fig. 2 shown in accompanying drawing 2 of operating point under constant voltage; " Q "-flow); Arrange from small to large according to optimal flux, the optimum capacity of three kinds of model water pumps is respectively: Qa, Qb, Qc, and satisfy Qa < Qb < Qc.If every water pump all guarantees in running with its optimal flux output under the certain lift of constant voltage; The various combination of three kinds of model water pumps can produce following 7 kinds of flow operating mode: Qa, Qb, Qa+Qb, Qc, Qa+Qc, Qb+Qc, Qa+Qb+Qc, and satisfies following relation:
Qa<Qb<Qa+Qb<Qc<Qa+Qc<Qb+Qc<Qa+Qb+Qc
3) start corresponding water pump combination according to the discrete traffic demand of difference
As shown in Figure 3, this efficient cluster type water pump system starts the starting mode of pump flow process and is:
At first confirm traffic demand Q, when the flow operating mode is Q1, start a pump, actual flow is Qa; When the flow operating mode is Q2, start the b pump, actual flow is Qb; When the flow operating mode is Q3, start a, b pump, actual flow is Qa+Qb; When the flow operating mode is Q4, start the c pump, actual flow is Qc; When the flow operating mode is Q5, start a, c pump, actual flow is Qa+Qc; When the flow operating mode is Q6, start b, c pump, actual flow is Qb+Qc; When the flow operating mode is Q7, start a, b, c pump, actual flow is Qa+Qb+Qc;
4) by the minimum policy setting optimal performance index of total water supply error
5) nonlinear optimal problem is found the solution three kinds of model water pump optimal flux undetermined
Problem is converted into the following nonlinear constraint optimization that has:
The result who tries to achieve is:
6) according to optimal flux value and work lift configuration water pump
Bring the data of seven kinds of discrete flows and corresponding probability thereof into following formula, the optimal flux that solves three water pumps is respectively: Qa=53.7176 m
3/ hour, Qb=147.0284 m
3/ hour, Qc=307.2524 m
3/ hour, according to operating mode setting work lift 100m.Select the nominal parameter of the approaching parameter of optimum operating condition point as three water pumps, configuration water pump, i.e. a water pump: metered flow is 54 m
3/ hour, rated head is 100m; The b water pump: metered flow is 147m
3/ hour, rated head is 100m; The c water pump: metered flow is 307 m
3/ hour, rated head is 100m;
7) set up efficient cluster water pump water supply system
As shown in Figure 4, three water pump a, b, c are linked to each other with motor M1, M2, M3 and control valve 1～control valve 3, three water pump a, b, c water inlets lead to reservoir 4, delivery port by the road to user 5.
As shown in Figure 5; Configuration PLC control module 6, total head bus 7, soft starter 8 and A.C. contactor KM1～KM3; Every motor connects total head bus 7 through the soft starter 8 of parallel connection with corresponding A.C. contactor constant open contact respectively, and the adhesive of soft starter 8 and A.C. contactor constant open contact KM1～KM3 and disconnection are through 6 controls of PLC control module.Which platform starting mode of pump PLC control module 6 confirms according to the flow operating mode, and connects corresponding soft initiator, starts the back and connects corresponding A.C. contactor constant open contact, makes starting mode of pump.
The analysis of saving water and energy of this allocation plan
The separate unit water pump allocation plan that satisfies the maximum stream flow demand with tradition compares, and the work in 24 hours of this allocation plan diel can be economized on water 5565.7 cubic metres, and economize on electricity is about 1.89*10
3Kw.H.
Claims (1)
1. the water pump collocation method of the cluster type water pump system of the discrete unsteady flow amount of a constant voltage is characterized in that:
1) confirms discrete flow working conditions change rule
Arrange from small to large by flow, discrete flow operating mode and corresponding probability are expressed as respectively:
（Q1，P1）、（Q2，P2）、（Q3，P3）…（Q7，P7）
Q representes flow, unit: m
3/ hour, Q1<q2<<q7, P represent the probability that corresponding discharge occurs, P1+ P2+ ... P7=1; Give expression to greater than 3 kinds smaller or equal to the Changing Pattern of 7 kinds of discrete flow working conditions change through top expression formula: when P1～P7 is not equal to zero, represent 7 kinds of discrete flow operating modes; When P1～P7 has 3 to be zero, be expressed as 4 kinds of discrete flow operating modes; Other situation and the like;
2) optimal flux of three kinds of model water pumps of setting
Arrange from small to large according to metered flow; The optimal flux of three kinds of model water pumps is respectively: Qa, Qb, Qc; And satisfy Qa < Qb < Qc; If every water pump guarantees all that in running the various combination of three kinds of model water pumps produces following 7 kinds of flow operating mode: Qa, Qb, Qa+Qb, Qc, Qa+Qc, Qb+Qc, Qa+Qb+Qc with its optimal flux output under the certain lift of constant voltage, and satisfies following relation:
Qa<Qb<Qa+Qb<Qc<Qa+Qc<Qb+Qc<Qa+Qb+Qc；
3) start corresponding water pump combination according to the discrete traffic demand of difference
When the flow operating mode is Q1, start a pump, actual flow is Qa; When the flow operating mode is Q2, start the b pump, actual flow is Qb; When the flow operating mode is Q3, start a, b pump, actual flow is Qa+Qb; When the flow operating mode is Q4, start the c pump, actual flow is Qc; When the flow operating mode is Q5, start a, c pump, actual flow is Qa+Qc; When the flow operating mode is Q6, start b, c pump, actual flow is Qb+Qc; When the flow operating mode is Q7, start a, b, c pump, actual flow is: Qa+Qb+Qc;
4) by the minimum policy setting optimal performance index of total water supply error
5) nonlinear optimal problem is found the solution three kinds of model water pump optimal flux undetermined
Problem is converted into the following nonlinear constraint optimization that has:
The result who tries to achieve is:
Following formula is matrix operation, and [] is expressed as matrix, and index-1 representing matrix is inverted;
6) according to optimal flux value configuration water pump
Bring the data of seven kinds of discrete flows and corresponding probability thereof into following formula, obtain optimal flux Qa, Qb, the Qc of three water pumps, select the approaching parameter of optimum operating condition point as three water pumps of nominal parameter configuration;
7) the efficient cluster water pump system of the discrete unsteady flow amount of establishment constant voltage
Three water pumps are linked to each other with three control valves with three motor; Configuration PLC control module, total head bus, three soft starters and three A.C. contactors; Every motor connects the total head bus through the soft starter of parallel connection with corresponding A.C. contactor constant open contact respectively; The adhesive of soft starter and A.C. contactor constant open contact with break off through the control of PLC control module, the PLC control module is used for controlling the duty of corresponding soft initiator and A.C. contactor constant open contact and with corresponding starting mode of pump according to the flow operating mode.
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104696186A (en) * | 2015-01-20 | 2015-06-10 | 沪东重机有限公司 | Pressure boosting unit provided with LNG (liquefied natural gas) pumps connected in parallel |
| CN106351291A (en) * | 2016-08-29 | 2017-01-25 | 中冶焦耐(大连)工程技术有限公司 | Method capable of efficiently adjusting water supply ability of water supply system and water supply system |
| CN110629829A (en) * | 2019-08-23 | 2019-12-31 | 云南大红山管道有限公司 | Process for flow balance adjustment between cascade water lifting pump stations and operation method |
| CN113586422A (en) * | 2021-08-25 | 2021-11-02 | 安徽智引力智慧水务有限公司 | Energy-saving method for power of step flow regulating pump |
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| CN104696186A (en) * | 2015-01-20 | 2015-06-10 | 沪东重机有限公司 | Pressure boosting unit provided with LNG (liquefied natural gas) pumps connected in parallel |
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| CN113586422A (en) * | 2021-08-25 | 2021-11-02 | 安徽智引力智慧水务有限公司 | Energy-saving method for power of step flow regulating pump |
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