CN105631192A - Comprehensive weighted evaluation method of pump unit energy consumption - Google Patents

Comprehensive weighted evaluation method of pump unit energy consumption Download PDF

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Publication number
CN105631192A
CN105631192A CN201510961766.0A CN201510961766A CN105631192A CN 105631192 A CN105631192 A CN 105631192A CN 201510961766 A CN201510961766 A CN 201510961766A CN 105631192 A CN105631192 A CN 105631192A
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pump installation
energy consumption
pump
unit
operating mode
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杨帆
刘超
周济人
赵浩儒
夏臣智
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Yangzhou University
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Yangzhou University
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  • Control Of Non-Positive-Displacement Pumps (AREA)

Abstract

Provided is a comprehensive weighted evaluation method of pump unit energy consumption, and belongs to the technical field of water conservancy projects. The method disclosed by the present invention comprises: based on a pump unit physical model test or a CFD numerical calculation result, selecting characteristic working condition data of a plumb unit, and when a lift of a plumb unit in the i working condition of the plumb unit is Hi, obtaining a value of Qi [Eta]i of the i working condition; using a pump unit group energy consumption calculation formula to deduce a single working condition energy consumption index P.E.I of pump unit energy consumption, and determining a P.E.I value of the i working condition of the pump unit; introducing days of the pump unit characteristic working condition for comprehensive weighted average, and determining weighting factors for different working conditions; and finally putting traffic, efficiency and operating days of different working conditions into a comprehensive evaluation index M.P.E calculation formula of the pump unit energy consumption, so as to obtain a comprehensive evaluation index of the pump unit energy consumption. The method disclosed by the present invention facilitates energy saving of an actual pump station, and saves energy costs of the pump station.

Description

A kind of aggregative weighted evaluation methodology of pump installation energy consumption
Technical field
The invention belongs to hydraulic engineering technical field, be specifically related to the energy consumption Comprehensive Assessment Technology of the pumping plant that multi-state is run.
Background technology
Large-scale filling in China is arranged pumping plant equilibration device efficiency and is only 40%��50%, energy unit consumption average out to 7��8kW h/ (kt m), pump assembly efficiency is mutually far short of what is expected from the requirement of pump assembly efficiency in " Code for design of pumping cstations " (GB50265-2010) 9.1.11 joint, a lot of pumping plant actual operating mode substantial deviation design conditions, the energy consumption problem of pumping plant has become the hot issue in hydraulic engineering field. Currently, in Practical Project, the selection of pumping plant hydraulic model normally only considers the efficiency of pumping plant during design conditions, people often think that now efficiency height then its operation energy consumption of pumping plant is low, have ignored efficiency of pumping station during other operating conditions, time only from design conditions, to select hydraulic model may not necessarily reach the energy consumption of pumping plant minimum for the standpoint of efficiency of pumping plant, the purpose that unit operation is the most energy-conservation. The influence factor of pumping plant unit power consumption also includes flow, lift and three key elements of operation time. When the pumping plant lift determined, if the total pump-out of pumping plant is identical, pumping plant units consumption needs pump assembly efficiency maximum the most at least, if two set pumping plant unit efficiencies and total Water are identical, then the power consumption of two set pumping plant units is identical, but the unit that pumping plant unit flow is bigger, it is short that it runs the time, the electromechanical equipment proportion of goods damageds are low, reliability is high, unit overall performance is more excellent, time therefore only using design conditions efficiency of pumping station as select hydraulic model according to not science to some extent, the energy consumption height of two pumping plant units is difficult to only be determined by this single index of efficiency of pumping station.
Summary of the invention
Selecting Problems existing for above-mentioned Practical Project hydraulic model, the present invention seeks to propose the integrated evaluating method of a kind of pump installation energy consumption, namely run the angle of multi-state from pump installation, the pump installation energy consumption that multi-state is run is weighted evaluating.
The present invention comprises the following steps:
1) by pump installation physical experiments or pump installation entirety CFD numerical computations, the energy characteristics parameter of pump installation during multi-state is obtained, including: flow Q, lift H, efficiency eta;
Data when the operating mode that lacks in individuality in the pump installation performance data provided, with the energy characteristics data of acquisition for sample, set up the nonlinear regression mathematical model of dependent variable y and independent variable x respectively, regression constant and partial regression coefficient are solved by the Gauss-Newton algorithm adopting nonlinear regression, and nonlinear regression numerical relationship model is as follows:
In formula: y=Q ��, x=H; a1, a2, a3,a4, a5Respectively partial regression coefficient; B is regression constant;
The feature lift value of known pump installation being substituted into nonlinear regression mathematical model y=f (x), can try to achieve the product value Q �� of flow Q and efficiency eta respectively, the coefficient of determination of nonlinear regression mathematical model is more than 0.99;
2) energy consumption evaluation indexes P.E.I(PumpsystemEnergyconsumptionIndex, the P.E.I of pump installation either simplex condition is derived from the calculating formula of pump installation unit power consumption E):
In formula: P.E.I is the energy consumption evaluation indexes of pump installation either simplex condition; Q is pump installation flow, unit: m3/ s; �� is pump assembly efficiency, unit: %; D is impeller of pump diameter, unit: m; N is wheel speed, unit: r/min;
The calculating formula that the operating condition parameter of pump installation substitutes into P.E.I tries to achieve the energy consumption evaluation indexes P.E.I of pump installation either simplex condition during each operating mode;
3) the aggregative weighted evaluation model of pump installation energy consumption is set up:
On the energy consumption evaluation indexes P.E.I basis of pump installation either simplex condition, introduce the days running of each feature operating mode of pump installation, set up the aggregative weighted evaluation index M.P.E(MultipleoperatingconditionsofPumpsystemEnergyconsu mptionIndex of pump installation energy consumption), calculating formula is as follows:
, wherein:
In formula: siFor i-th operating mode weighter factor, M is operating mode classification sum; QiThe flow of pump installation during for i-th operating mode; diFor total natural law that i-th operating mode is run; Sum(di) pump installation runs when being different operating mode natural law summation, sum (di)��366; N is wheel speed, unit: min/r; D is impeller of pump diameter, unit: m; ��iFor pump assembly efficiency, unit: %.
The present invention selects the feature floor data of pump installation based on the physical experiments of pump installation or CFD numerical result, at the pump installation lift H of known pump installation i-th operating modeiTime, obtain pump installation by step 1) and run the Q of i-th operating modei����iNumerical value; Adopt the either simplex condition energy consumption evaluation indexes P.E.I of pump installation unit power consumption calculating formula derivation pump installation energy consumption, by step 2) obtain the P.E.I value of pump installation i-th operating mode respectively; The natural law introducing pump installation feature operating mode carries out aggregative weighted on average, is obtained the weighter factor of different operating mode by step 3); Finally respectively the different flows of operating condition, efficiency and days running are substituting to the calculating formula of the comprehensive evaluation index M.P.E of pump installation energy consumption, draw the energy consumption comprehensive evaluation index of this pump installation. The comprehensive evaluation index M.P.E numerical value of pump installation energy consumption is the bigger the better, and this numerical value be on the occasion of.
The present invention has cracked the sole indicator problem only pump installation hydraulic efficiency consumed energy as evaluation pump installation, adopt the method can the comprehensive energy consumption of pump installation of Integrated comparative different schemes, avoid the pump assembly efficiency only with design conditions as the unicity of evaluation index and not scientific, be conducive to the energy-saving and cost-reducing of actual pumping plant, save pumping plant energy cost, reach the purpose of energy-conserving and environment-protective, also preferably provide a kind of method reliably for different schemes pump installation.
Accompanying drawing explanation
Fig. 1 is the overall merit flow chart of pump installation energy consumption of the present invention.
Detailed description of the invention
Below in conjunction with drawings and Examples, the present invention is further elaborated.
A kind of pump installation energy consumption flow process is as shown in Figure 1.
The energy characteristics data of existing four set pump installations, but do not comprise all of operating point data, adopt above step 1 for this) method build the numerical function relation of Q �� and H, math equation is as follows:
In formula: y=Q ��, x=H.
Solving with the Gauss-Newton algorithm regression constant to Nonlinear regression equation and partial regression coefficient, solving result is as shown in table 1. The coefficient of determination of each Nonlinear regression equation is all higher than 0.99, meets requirement.
The coefficient of table 1 nonlinear regression math equation
Step 1) basis obtain on the nonlinear multivariable numerical relationship model basis of Q �� and H of four set pump installations, for pump installation operating condition feature, it is determined that the Q �� value corresponding to each operating mode pump installation lift H. For pump installation operation characteristic, have selected three feature operating modes: operating mode 1 is rated lift 1.44m, and operating condition 2 is minimum lift 0.30m, and operating mode 3 is the most high-lift 2.80m, when this 3 feature operating modes, it is assumed that the natural law that pump installation runs respectively 60 days, 40 days and 210 days.
According to above step 2), the energy consumption evaluation indexes P.E.I value of pump installation either simplex condition when pump installations calculate 3 feature operating modes respectively is overlapped to 4, result of calculation is table 2 such as, with operating condition 1 for selection gist, then should select pump installation 4; With operating condition 2 for selection gist, then should select pump installation 4; With operating condition 3 for selection gist, then answer preferred pump device 3, from step 2) result that obtains, it is known that the selection of pump installation scheme or hydraulic model only can not be carried out with this single index of pump assembly efficiency.
In above step 2) basis on, overlap pump installations to 4 and carry out the solving of comprehensive evaluation index M.P.E of pump installation energy consumption, solving result is as shown in table 2. when assuming pump installation days running, the pump installation multi-state performance weighting evaluation index M.P.E value of scheme 2 is maximum, is secondly pump installation 3, pump installation 1 and pump installation 4. during either simplex condition, the Synthetical Hydraulic Characteristics of pump installation is optimum, and the overall characteristic of this pump installation may not be optimum when multi-state runs, when different pump installation energy consumptions are carried out overall merit, after can first selecting some outstanding hydraulic models and pump installation form to carry out independent assortment, each scheme pump installation is carried out full runner Three-dimensional numerical calculation or physical experiments, the pump installation energy consumption integrated evaluating method that the present invention proposes is adopted to be evaluated analyzing to the energy consumption of pump installation further according to pump installation actual motion feature lift demand, thus reaching more fully to analyze the energy consumption of pump installation, a kind of method reliably is preferably provided for pump installation form.
Energy consumption overall merit P.E.I and the M.P.E value of the different pump installation of table 2

Claims (1)

1. the aggregative weighted evaluation methodology of a pump installation energy consumption, it is characterised in that comprise the following steps:
1) by pump installation physical experiments or pump installation entirety CFD numerical computations, the energy characteristics parameter of pump installation during multi-state is obtained, including: flow Q, lift H, efficiency eta;
Data when the operating mode that lacks in individuality in the pump installation performance data provided, with the energy characteristics data of acquisition for sample, set up the nonlinear regression mathematical model of dependent variable y and independent variable x respectively, regression constant and partial regression coefficient are solved by the Gauss-Newton algorithm adopting nonlinear regression, and nonlinear regression numerical relationship model is as follows:
In formula: y=Q ��, x=H; a1, a2, a3,a4, a5Respectively partial regression coefficient; B is regression constant;
The feature lift value of known pump installation being substituted into nonlinear regression mathematical model y=f (x), can try to achieve the product value Q �� of flow Q and efficiency eta respectively, the coefficient of determination of nonlinear regression mathematical model is more than 0.99;
2) derive the energy consumption evaluation indexes P.E.I of pump installation either simplex condition from the calculating formula of pump installation unit power consumption E, calculating formula is as follows:
In formula: P.E.I is the energy consumption evaluation indexes of pump installation either simplex condition; Q is pump installation flow, unit: m3/ s; �� is pump assembly efficiency, unit: %; D is impeller of pump diameter, unit: m; N is wheel speed, unit: r/min;
The calculating formula that the operating condition parameter of pump installation substitutes into P.E.I tries to achieve the energy consumption evaluation indexes P.E.I of pump installation either simplex condition during each operating mode;
3) the aggregative weighted evaluation model of pump installation energy consumption is set up:
On the energy consumption evaluation indexes P.E.I basis of pump installation either simplex condition, introducing the days running of each feature operating mode of pump installation, set up the aggregative weighted evaluation index M.P.E of pump installation energy consumption, calculating formula is as follows:
, wherein:
In formula: siFor i-th operating mode weighter factor, M is operating mode classification sum; QiThe flow of pump installation during for i-th operating mode; diFor total natural law that i-th operating mode is run; Sum(di) pump installation runs when being different operating mode natural law summation, sum (di)��366; N is wheel speed, unit: min/r; D is impeller of pump diameter, unit: m; ��iFor pump assembly efficiency, unit: %.
CN201510961766.0A 2015-12-21 2015-12-21 Comprehensive weighted evaluation method of pump unit energy consumption Pending CN105631192A (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109899041A (en) * 2019-03-28 2019-06-18 中国石油化工股份有限公司 A kind of oil field ground gas injection system Energy Consumption Evaluation method
CN110705130A (en) * 2019-10-31 2020-01-17 扬州大学 Water pump model selection method for low-lift pump device of large pump station
CN110929407A (en) * 2019-11-29 2020-03-27 清华大学 Energy efficiency evaluation method of shielding electric pump for heating

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CN104636542A (en) * 2014-12-31 2015-05-20 扬州大学 Method for predicting energy performance of pump through adjustable guide vane on basis of CFD

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CN103062076A (en) * 2013-01-25 2013-04-24 北京清华同衡规划设计研究院有限公司 Method for calibrating performance curve of single water pump in urban water plant pump station
CN104636542A (en) * 2014-12-31 2015-05-20 扬州大学 Method for predicting energy performance of pump through adjustable guide vane on basis of CFD

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Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109899041A (en) * 2019-03-28 2019-06-18 中国石油化工股份有限公司 A kind of oil field ground gas injection system Energy Consumption Evaluation method
CN109899041B (en) * 2019-03-28 2020-04-10 中国石油化工股份有限公司 Energy consumption evaluation method for oil field ground gas injection system
CN110705130A (en) * 2019-10-31 2020-01-17 扬州大学 Water pump model selection method for low-lift pump device of large pump station
CN110705130B (en) * 2019-10-31 2024-01-30 扬州大学 Water pump model selection method for low-lift pump device of large pump station
CN110929407A (en) * 2019-11-29 2020-03-27 清华大学 Energy efficiency evaluation method of shielding electric pump for heating
CN110929407B (en) * 2019-11-29 2021-06-08 清华大学 Energy efficiency evaluation method of shielding electric pump for heating

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