CN111005880A - Centrifugal pump energy efficiency assessment method and device - Google Patents
Centrifugal pump energy efficiency assessment method and device Download PDFInfo
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Abstract
The invention discloses a centrifugal pump energy efficiency evaluation method, which comprises the following steps: fitting to obtain a unitary quadratic function relation of the lift and the shaft power of the centrifugal pump; rewriting and obtaining a unitary quadratic function relation of the centrifugal pump lift and the active power of the motor; obtaining the running lift value of the centrifugal pump; obtaining a theoretical value of active power of a motor of the centrifugal pump; and measuring the actual value of the active power of the motor of the centrifugal pump, and comparing the actual value with the theoretical value to obtain the energy efficiency evaluation index of the centrifugal pump. The invention also discloses a centrifugal pump energy efficiency evaluation device which comprises a data input module, a data acquisition module, a data storage module, a data operation module and a data display module. The method and the device for evaluating the energy efficiency of the centrifugal pump have the advantages of simple structure, low cost, stability, reliability, user friendliness and the like, and can accurately evaluate the energy consumption level of the centrifugal pump in the operation process and give scientific prompts, thereby being beneficial to energy conservation and consumption reduction of the centrifugal pump.
Description
Technical Field
The invention relates to the field of centrifugal pumps, in particular to a method and a device for evaluating energy efficiency of a centrifugal pump.
Background
The pump is a universal machine with wide application, is not only a main device for conveying fluids in various industrial doors such as metallurgy, steel, chemical industry, petrifaction and medicine, but also is a necessary water supply and drainage device in the fields of municipal water supply and sewage treatment in daily life. Due to the large application of the pump in production and life, the pump also consumes a large amount of energy, and statistical data show that the energy consumption of the pump accounts for about 20% of the total power generation amount in China. Therefore, a high level of energy efficiency during pump operation must be of concern. The centrifugal pump is the door with the largest usage and the largest model in various pump products, so that the energy efficiency evaluation work of the centrifugal pump has very important value and significance.
The energy efficiency level of a centrifugal pump is closely related to the performance of the pump itself. When the centrifugal pump leaves a factory, manufacturers can give performance curves of the centrifugal pump, and the performance curves generally comprise a flow-lift curve, a flow-shaft power curve and the like. However, after the centrifugal pump is operated for a period of time at a work site, the energy efficiency level of the actual operation of the centrifugal pump may be lower than the factory state due to various environmental factors at the work site and the maintenance level of operators, and the condition of the operation of the centrifugal pump at the low energy efficiency level is often difficult to detect. Therefore, various methods and tools for monitoring and diagnosing the operating energy efficiency level of the centrifugal pump are greatly developed. However, the known methods and tools for monitoring and diagnosing the energy efficiency level of centrifugal pump operation require various sophisticated instruments and equipment and depend to a large extent on the experience accumulation and knowledge level of the skilled person. Therefore, in order to overcome the defects of the existing known technical solutions, it is necessary to develop a new method for evaluating the operating energy efficiency of the centrifugal pump and design a corresponding device, so as to better achieve the purpose of online evaluation of the operating energy efficiency of the centrifugal pump, that is, to ensure the reliability of the evaluation and to reduce the difficulty and cost of the evaluation as much as possible.
Disclosure of Invention
In order to solve the technical problems, the invention provides a simple, easy, stable, reliable and user-friendly method for evaluating the energy efficiency of the centrifugal pump, and provides a device for evaluating the energy efficiency of the centrifugal pump.
The technical scheme for solving the problems is as follows: a centrifugal pump energy efficiency evaluation method is applied to a centrifugal pump pumping system, the centrifugal pump pumping system comprises a centrifugal pump (10), a motor (20) mechanically connected with the centrifugal pump and used for driving the centrifugal pump to run, an inlet pipeline (30) and an outlet pipeline (40) mechanically connected with an inlet and an outlet of the centrifugal pump (10) respectively, an inlet pressure sensor (50) and an outlet pressure sensor (60) mechanically connected with the inlet pipeline (30) and the outlet pipeline (40) of the centrifugal pump respectively and in contact with fluid in the pipelines, and an active power meter (70) electrically connected with the motor (20) and used for measuring active power of the motor (20) in real time, and the method is characterized by comprising the following steps:
step 1, fitting and obtaining a unitary quadratic function relation of the lift of the centrifugal pump and the shaft power according to a performance curve of the centrifugal pump:
looking up a flow-lift performance curve and a flow-shaft power performance curve of the centrifugal pump, sorting data on the basis to obtain a head-shaft power data combination point of the centrifugal pump, and fitting the head-shaft power data combination point of the centrifugal pump into a unitary quadratic function relation:
N＝aH2+bH+c (1)
in the formula (1), N and H are respectively the shaft power and the lift of the centrifugal pump, and a, b and c are respectively a quadratic term coefficient, a first order term coefficient and a constant term of a unitary quadratic function relational expression;
step 2, according to the main shaft transmission efficiency and the motor efficiency of a pump system of the centrifugal pump, rewriting the head-shaft power unitary quadratic function relation of the centrifugal pump obtained in the step 1 into a head-motor active power unitary quadratic function relation:
review of spindle drive efficiency for centrifugal pump system η1And motor efficiency η2And (2) rewriting the head-shaft power unitary quadratic function relation of the centrifugal pump obtained in the step (1) into a head-motor active power unitary quadratic function relation:
in formula (2), W and H are respectively the active power and the lift of the motor of the centrifugal pump, η1And η2The main shaft transmission efficiency and the motor efficiency of a centrifugal pump system are respectively;
step 3, respectively measuring the inlet pressure and the outlet pressure of the centrifugal pump, and subtracting the inlet pressure value from the outlet pressure to obtain an operating lift value of the centrifugal pump;
step 4, substituting the centrifugal pump running lift value obtained by measurement in the step 3 into the centrifugal pump lift-motor active power unitary quadratic function relation obtained in the step 2 to obtain a motor active power theoretical value W of the centrifugal pumpt；
Step 5, measuring the actual value W of the active power of the motor of the centrifugal pumprAnd comparing the theoretical value W of the active power of the motor of the centrifugal pump obtained in the step 4tAnd comparing to obtain an energy efficiency evaluation index of the centrifugal pump:
actual value W of active power of motor of centrifugal pumprDivided by the theoretical value W of active power of the motor of the centrifugal pumptAnd obtaining an energy efficiency coefficient K of the centrifugal pump:
calculating the energy efficiency score S of the centrifugal pump based on the energy efficiency coefficient K of the centrifugal pump:
when the energy efficiency coefficient K of the centrifugal pump is larger than 1.1, calculating the potential annual electric quantity E of the centrifugal pump:
E＝t(K-1)Wt(5)
in formula (5), K and WtThe energy efficiency coefficient and the active power theoretical value of the lift motor of the centrifugal pump are respectively, E is the potential annual electric quantity of the centrifugal pump, and t is the annual running time of the centrifugal pump.
The method for evaluating the energy efficiency of the centrifugal pump is characterized in that the method for obtaining the relationship of the head-shaft power unitary quadratic function of the centrifugal pump in the step 1 comprises the following substeps:
step (1.1), looking up a flow-lift performance curve of the centrifugal pump to obtain a flow value sequence (Q) of not less than 5 data points1，Q2，Q3，Q4，Q5…) and the corresponding head value sequence (H)1，H2，H3，H4，H5，…)；
Step (1.2), flow value sequence (Q) selected according to step (1.1)1，Q2，Q3，Q4，Q5…), a flow-axial power performance curve of the centrifugal pump is consulted, and a sequence of axial power values (N) corresponding to the selected flow values is determined in turn1，N2，N3，N4，N5，…)；
Step (1.3), step (b)(1.1) determined head value sequence (H)1，H2，H3，H4，H5…) and the sequence of shaft power values (N) determined in step (1.2)1，N2，N3，N4，N5…) are combined in pairs in sequence to form a head-shaft power data combination point (H) of the centrifugal pump with not less than 5 points1，N1)，(H2，N2)，(H3，N3)，(H4，N4)，(H5，N5)，…；
And (1.4) fitting the head-shaft power data combination points of the centrifugal pump obtained in the step (1.3) into a unitary quadratic function relation based on a least square method.
An evaluation apparatus for implementing the energy efficiency evaluation method described above,
be applied to among centrifugal pump machine pump system, centrifugal pump machine pump system includes centrifugal pump (10), be used for driving motor (20) of centrifugal pump operation with centrifugal pump mechanical connection, entry pipeline (30) and outlet pipe way (40) with centrifugal pump (10) entry and export mechanical connection respectively, entry pressure sensor (50) and outlet pressure sensor (60) with centrifugal pump entry pipeline (30) and outlet pipe way (40) mechanical connection respectively and with the interior fluid contact of pipeline, active power meter (70) that are used for real-time measurement motor (20) active power with motor (20) electric connection, its characterized in that: the device comprises a data input module (81), a data acquisition module (82), a data storage module (83), a data operation module (84) and a data display module (85):
the data input module (81), the data acquisition module (82), the data operation module (84) and the data display module (85) are electrically connected with the data storage module (83);
the data acquisition module (82) is electrically connected with the inlet pressure sensor (50), the outlet pressure sensor (60) and the active power meter (70);
the data input module (81) is used for manually inputting a lifting head-motor active power unitary quadratic function relation of the centrifugal pump and the annual running time of the centrifugal pump;
the data acquisition module (82) is used for synchronously acquiring the inlet pressure and the outlet pressure measured by the inlet pressure sensor (50) and the outlet pressure sensor (60) and the actual value of the active power of the motor measured by the active power meter (70) in real time;
the data storage module (83) is used for storing a data input value of the data input module (81), a data acquisition value of the data acquisition module (82) and a data operation value of the data operation module (84), and outputting the data operation value of the data operation module (84) to the data display module (85);
the data operation module (84) acquires relevant input data and acquisition data from the data storage module (83), calculates in real time to obtain centrifugal pump energy efficiency evaluation indexes such as an operating head value, a motor active power theoretical value, an energy efficiency coefficient, an energy efficiency score and potential annual energy conservation quantity of the centrifugal pump, and returns all calculation results to the data storage module (83);
and the data display module (85) is used for acquiring the operating lift value of the centrifugal pump, the theoretical value of the active power of the motor, the energy efficiency coefficient, the energy efficiency score, the potential annual energy saving quantity and other energy efficiency evaluation indexes of the centrifugal pump in real time from the data storage module (83) and displaying the indexes in real time.
The invention has the beneficial effects that:
1. aiming at the actual conditions that the environmental factors of the working site of the centrifugal pump are complex and the running state is changeable, the invention fully applies the flow-lift performance curve and the flow-shaft power performance curve of the centrifugal pump, arranges data and fits to obtain the lift-shaft power unitary quadratic function relation of the centrifugal pump, introduces the main shaft transmission efficiency and the motor efficiency of the pump system of the centrifugal pump, further rewrites to obtain the lift-motor active power unitary quadratic function relation, and can calculate the active power of the motor by the running lift of the centrifugal pump based on the lift-lift relation, thereby realizing the online real-time acquisition of the active power theoretical value of the motor in the running process of the centrifugal pump.
2. The method uses the active power meter to measure the actual value of the active power of the motor of the centrifugal pump on line in real time, and then compares the actual value with the theoretical value of the active power to realize the on-line real-time evaluation of the operating energy efficiency of the centrifugal pump, and in the on-line real-time evaluation link, the method provides evaluation indexes such as the energy efficiency coefficient, the energy efficiency score and the like of the centrifugal pump, and also calculates the potential annual energy saving quantity of the centrifugal pump when the energy efficiency level of the centrifugal pump is poor.
3. The centrifugal pump energy efficiency assessment method provided by the invention has the advantages of being scientific and reasonable, clear in logic, simple and easy to implement, easy to popularize and the like, is a remarkable improvement of the existing centrifugal pump energy efficiency assessment technology, and is stable and reliable, low in cost and very friendly to users.
Drawings
FIG. 1 is a flow chart of a centrifugal pump energy efficiency assessment method of the present invention.
Fig. 2 is a structural block diagram of the centrifugal pump energy efficiency evaluation device of the present invention, in which (10) is a centrifugal pump, (20) is a motor, (30) is an inlet pipe, (40) is an outlet pipe, (50) is an inlet pressure sensor, (60) is an outlet pressure sensor, (70) is an active power meter, (8) is a centrifugal pump energy efficiency evaluation device, and (81) to (85) together form the centrifugal pump energy efficiency evaluation device (8), wherein (81) is a data input module, (82) is a data acquisition module, (83) is a data storage module, (84) is a data operation module, and (85) is a data display module.
Fig. 3 is a centrifugal pump head-shaft power curve of an embodiment of the present invention.
Detailed Description
The invention is further described below with reference to the figures and examples.
As shown in fig. 1, a centrifugal pump energy efficiency evaluation method is applied to a centrifugal pump pumping system, which is shown in fig. 2, the centrifugal pump pumping system comprises a centrifugal pump (10), a motor (20) mechanically connected with the centrifugal pump for driving the centrifugal pump to operate, an inlet pipeline (30) and an outlet pipeline (40) mechanically connected with an inlet and an outlet of the centrifugal pump (10) respectively, an inlet pressure sensor (50) and an outlet pressure sensor (60) mechanically connected with the inlet pipeline (30) and the outlet pipeline (40) of the centrifugal pump respectively and in contact with fluid in the pipelines, and an active power meter (70) electrically connected with the motor (20) for measuring active power of the motor (20) in real time, and is characterized in that, referring to fig. 1, the method comprises the following steps:
step 1, fitting and obtaining a unitary quadratic function relation of the lift of the centrifugal pump and the shaft power according to a performance curve of the centrifugal pump:
looking up a flow-lift performance curve and a flow-shaft power performance curve of the centrifugal pump, sorting data on the basis to obtain a head-shaft power data combination point of the centrifugal pump, and fitting the head-shaft power data combination point of the centrifugal pump into a unitary quadratic function relation:
N＝aH2+bH+c (1)
in the formula (1), N and H are respectively the shaft power and the lift of the centrifugal pump, and a, b and c are respectively a quadratic term coefficient, a first order term coefficient and a constant term of a unitary quadratic function relational expression;
the above-mentioned obtaining of the relationship of the centrifugal pump head-shaft power unitary quadratic function is divided into the following substeps:
step (1.1), looking up a flow-lift performance curve of the centrifugal pump to obtain a flow value sequence (Q) of not less than 5 data points1，Q2，Q3，Q4，Q5…) and the corresponding head value sequence (H)1，H2，H3，H4，H5，…)；
Step (1.2), flow value sequence (Q) selected according to step (1.1)1，Q2，Q3，Q4，Q5…), a flow-axial power performance curve of the centrifugal pump is consulted, and a sequence of axial power values (N) corresponding to the selected flow values is determined in turn1，N2，N3，N4，N5，…)；
Step (1.3) of sequencing the lift values (H) determined in step (1.1)1，H2，H3，H4，H5…) and the sequence of shaft power values (N) determined in step (1.2)1，N2，N3，N4，N5…) are combined in pairs in sequence to form a head-shaft power data combination point (H) of the centrifugal pump with not less than 5 points1，N1)，(H2，N2)，(H3，N3)，(H4，N4)，(H5，N5)，…；
Step (1.4), fitting the head-shaft power data combination points of the centrifugal pump obtained in the step (1.3) into a unitary quadratic function relation based on a least square method;
step 2, according to the main shaft transmission efficiency and the motor efficiency of a pump system of the centrifugal pump, rewriting the head-shaft power unitary quadratic function relation of the centrifugal pump obtained in the step 1 into a head-motor active power unitary quadratic function relation:
review of spindle drive efficiency for centrifugal pump system η1And motor efficiency η2And (2) rewriting the head-shaft power unitary quadratic function relation of the centrifugal pump obtained in the step (1) into a head-motor active power unitary quadratic function relation:
in formula (2), W and H are respectively the active power and the lift of the motor of the centrifugal pump, η1And η2The main shaft transmission efficiency and the motor efficiency of a centrifugal pump system are respectively;
step 3, respectively measuring the inlet pressure and the outlet pressure of the centrifugal pump, and subtracting the inlet pressure value from the outlet pressure to obtain an operating lift value of the centrifugal pump;
step 4, substituting the centrifugal pump running lift value obtained by measurement in the step 3 into the centrifugal pump lift-motor active power unitary quadratic function relation obtained in the step 2 to obtain a motor active power theoretical value W of the centrifugal pumpt；
Step 5, measuring the centrifugal pumpActual value of active power W of the motorrAnd comparing the theoretical value W of the active power of the motor of the centrifugal pump obtained in the step 4tAnd comparing to obtain an energy efficiency evaluation index of the centrifugal pump:
actual value W of active power of motor of centrifugal pumprDivided by the theoretical value W of active power of the motor of the centrifugal pumptAnd obtaining an energy efficiency coefficient K of the centrifugal pump:
calculating the energy efficiency score S of the centrifugal pump based on the energy efficiency coefficient K of the centrifugal pump:
when the energy efficiency coefficient K of the centrifugal pump is larger than 1.1, calculating the potential annual electric quantity E of the centrifugal pump:
E＝t(K-1)Wt(5)
in formula (5), K and WtThe energy efficiency coefficient and the active power theoretical value of the lift motor of the centrifugal pump are respectively, E is the potential annual electric quantity of the centrifugal pump, and t is the annual running time of the centrifugal pump.
Referring to fig. 2, a centrifugal pump energy efficiency evaluation device is applied to a centrifugal pump system, the centrifugal pump system includes a centrifugal pump (10), a motor (20) mechanically connected to the centrifugal pump for driving the centrifugal pump to operate, an inlet pipe (30) and an outlet pipe (40) mechanically connected to an inlet and an outlet of the centrifugal pump (10), an inlet pressure sensor (50) and an outlet pressure sensor (60) mechanically connected to the inlet pipe (30) and the outlet pipe (40) of the centrifugal pump respectively and in contact with fluid in the pipes, and an active power meter (70) electrically connected to the motor (20) for measuring active power of the motor (20) in real time, wherein: the device comprises a data input module (81), a data acquisition module (82), a data storage module (83), a data operation module (84) and a data display module (85):
the data input module (81), the data acquisition module (82), the data operation module (84) and the data display module (85) are electrically connected with the data storage module (83);
the data acquisition module (82) is electrically connected with the inlet pressure sensor (50), the outlet pressure sensor (60) and the active power meter (70);
the data input module (81) is used for manually inputting a lifting head-motor active power unitary quadratic function relation of the centrifugal pump and the annual running time of the centrifugal pump;
the data acquisition module (82) is used for synchronously acquiring the inlet pressure and the outlet pressure measured by the inlet pressure sensor (50) and the outlet pressure sensor (60) and the actual value of the active power of the motor measured by the active power meter (70) in real time;
the data storage module (83) is used for storing a data input value of the data input module (81), a data acquisition value of the data acquisition module (82) and a data operation value of the data operation module (84), and outputting the data operation value of the data operation module (84) to the data display module (85);
the data operation module (84) acquires relevant input data and acquisition data from the data storage module (83), calculates in real time to obtain centrifugal pump energy efficiency evaluation indexes such as an operating head value, a motor active power theoretical value, an energy efficiency coefficient, an energy efficiency score and potential annual energy conservation quantity of the centrifugal pump, and returns all calculation results to the data storage module (83);
and the data display module (85) is used for acquiring the operating lift value of the centrifugal pump, the theoretical value of the active power of the motor, the energy efficiency coefficient, the energy efficiency score, the potential annual energy saving quantity and other energy efficiency evaluation indexes of the centrifugal pump in real time from the data storage module (83) and displaying the indexes in real time.
Examples
The rated flow of a certain centrifugal pump of a certain water supply pump station is 620m3And h, the rated lift is 103m, the rated rotating speed is 1480r/min, the spindle of the centrifugal pump is mechanically connected with the motor shaft through a coupler, and a flow-lift performance curve and a flow-shaft power performance curve of the centrifugal pump are consulted to obtain 5 groups of data points, which are shown in table 1.
TABLE 1 Performance data points for centrifugal pumps
The lift values in the second column and the shaft power values in the third column in table 1 are combined pairwise in order to form 5 data combination points, as shown in fig. 2, and the 5 data points are further fitted based on a least square method to obtain a unitary quadratic function relation of the lift (H) -shaft power (N) of the centrifugal pump:
N＝aH2+bH+c＝-0.3377H2+63H-2704
that is, the coefficient a of the quadratic term of the unitary quadratic function relation is-0.3377, the coefficient b of the first order term is 63, and the constant term c is-2704.
Review of spindle drive efficiency for centrifugal pump system η1Motor efficiency η ═ 0.972And when the value is 0.92, the head (H) -shaft power (N) unitary quadratic function relation of the centrifugal pump is rewritten into a head (H) -motor active power (W) unitary quadratic function relation:
respectively measuring the inlet pressure and the outlet pressure of the centrifugal pump at the current moment to obtain 0.04MPa and 0.99MPa respectively, subtracting the inlet pressure value from the outlet pressure to obtain the running lift value of the centrifugal pump to be 98m, and substituting the running lift value into a unitary quadratic function relation of lift (H) -active power (W) of the motor to obtain the theoretical value W of the active power of the motort＝255kW。
Measuring actual value W of active power of motor of centrifugal pump at current momentr288kW, the theoretical value W of the active power of the motor of the centrifugal pump is compared with the theoretical value W of the active power of the motor of the centrifugal pumpt255kW compares, obtains centrifugal pump efficiency evaluation index:
the energy efficiency coefficient K of the centrifugal pump is obtained as follows:
since the energy efficiency coefficient K of the centrifugal pump is 1.13, K is 1 ≦ K ≦ 2, and therefore the energy efficiency score S of the centrifugal pump is calculated as 100 × (2-K) ═ 100 × (2-1.13) ═ 87.
And because the energy efficiency coefficient K of the centrifugal pump is more than 1.1, the annual operation time t of the centrifugal pump is 8000 hours according to the actual condition, and the potential annual energy saving electric quantity E of the centrifugal pump is calculated as follows:
E＝t(K-1)Wt＝8000*(1.13-1)*255＝2.652*105kW·h
and energy efficiency evaluation indexes such as the energy efficiency coefficient, the energy efficiency score and the potential annual energy saving quantity of the centrifugal pump are output to a data display module to be displayed.
The method and the device for evaluating the energy efficiency of the centrifugal pump provided by the embodiment are very suitable for the conditions that the environmental factors of the working site of the centrifugal pump are complex and the running state is changeable, by means of a flow-lift performance curve and a flow-shaft power performance curve provided by a centrifugal pump manufacturer and the main shaft transmission efficiency and the motor efficiency of a pump system of the centrifugal pump machine, a unitary quadratic function relation of lift-motor active power is obtained through data processing and function fitting and rewriting, and the running lift value of the centrifugal pump actually measured on line is brought into the function relation, so that the theoretical value of the motor active power under the running working condition of the centrifugal pump is accurately obtained; on the basis, the actual value of the active power of the motor of the centrifugal pump is synchronously measured on line and is used for being compared with the theoretical value of the active power of the motor to obtain the energy efficiency coefficient of the centrifugal pump; and finally, carrying out energy efficiency evaluation and calculation of potential annual energy saving quantity according to the energy efficiency coefficient. Therefore, the method and the device for evaluating the energy efficiency of the centrifugal pump provided by the embodiment have a series of outstanding advantages of objective science, stability, reliability, simplicity, convenience, practicability, user friendliness, wide application range and the like, and have obvious technical progress on the basis of the existing method for evaluating the energy efficiency of the centrifugal pump.
Claims (3)
1. A centrifugal pump energy efficiency evaluation method is applied to a centrifugal pump pumping system, the centrifugal pump pumping system comprises a centrifugal pump (10), a motor (20) mechanically connected with the centrifugal pump and used for driving the centrifugal pump to run, an inlet pipeline (30) and an outlet pipeline (40) mechanically connected with an inlet and an outlet of the centrifugal pump (10) respectively, an inlet pressure sensor (50) and an outlet pressure sensor (60) mechanically connected with the inlet pipeline (30) and the outlet pipeline (40) of the centrifugal pump respectively and in contact with fluid in the pipelines, and an active power meter (70) electrically connected with the motor (20) and used for measuring active power of the motor (20) in real time, and the method is characterized by comprising the following steps:
step 1, fitting and obtaining a unitary quadratic function relation of the lift of the centrifugal pump and the shaft power according to a performance curve of the centrifugal pump:
looking up a flow-lift performance curve and a flow-shaft power performance curve of the centrifugal pump, sorting data on the basis to obtain a head-shaft power data combination point of the centrifugal pump, and fitting the head-shaft power data combination point of the centrifugal pump into a unitary quadratic function relation:
N＝aH2+bH+c (1)
in the formula (1), N and H are respectively the shaft power and the lift of the centrifugal pump, and a, b and c are respectively a quadratic term coefficient, a first order term coefficient and a constant term of a unitary quadratic function relational expression;
step 2, according to the main shaft transmission efficiency and the motor efficiency of a pump system of the centrifugal pump, rewriting the head-shaft power unitary quadratic function relation of the centrifugal pump obtained in the step 1 into a head-motor active power unitary quadratic function relation:
review of spindle drive efficiency for centrifugal pump system η1And motor efficiency η2And (2) rewriting the head-shaft power unitary quadratic function relation of the centrifugal pump obtained in the step (1) into a head-motor active power unitary quadratic function relation:
in formula (2), W and H are respectively the active power and the lift of the motor of the centrifugal pump, η1And η2The main shaft transmission efficiency and the motor efficiency of a centrifugal pump system are respectively;
step 3, respectively measuring the inlet pressure and the outlet pressure of the centrifugal pump, and subtracting the inlet pressure value from the outlet pressure to obtain an operating lift value of the centrifugal pump;
step 4, substituting the centrifugal pump running lift value obtained by measurement in the step 3 into the centrifugal pump lift-motor active power unitary quadratic function relation obtained in the step 2 to obtain a motor active power theoretical value W of the centrifugal pumpt；
Step 5, measuring the actual value W of the active power of the motor of the centrifugal pumprAnd comparing the theoretical value W of the active power of the motor of the centrifugal pump obtained in the step 4tAnd comparing to obtain an energy efficiency evaluation index of the centrifugal pump:
actual value W of active power of motor of centrifugal pumprDivided by the theoretical value W of active power of the motor of the centrifugal pumptAnd obtaining an energy efficiency coefficient K of the centrifugal pump:
calculating the energy efficiency score S of the centrifugal pump based on the energy efficiency coefficient K of the centrifugal pump:
when the energy efficiency coefficient K of the centrifugal pump is larger than 1.1, calculating the potential annual electric quantity E of the centrifugal pump:
E＝t(K-1)Wt(5)
in formula (5), K and WtThe energy efficiency coefficient and the active power theoretical value of the lift motor of the centrifugal pump are respectively, E is the potential annual electric quantity of the centrifugal pump, and t is the annual running time of the centrifugal pump.
2. The method for evaluating the energy efficiency of the centrifugal pump according to claim 1, wherein the obtaining of the relationship of the head-shaft power unitary quadratic function of the centrifugal pump according to step 1 is divided into the following substeps:
step (1.1), looking up a flow-lift performance curve of the centrifugal pump to obtain a flow value sequence (Q) of not less than 5 data points1，Q2，Q3，Q4，Q5…) and the corresponding head value sequence (H)1，H2，H3，H4，H5，…)；
Step (1.2), flow value sequence (Q) selected according to step (1.1)1，Q2，Q3，Q4，Q5…), a flow-axial power performance curve of the centrifugal pump is consulted, and a sequence of axial power values (N) corresponding to the selected flow values is determined in turn1，N2，N3，N4，N5，…)；
Step (1.3) of sequencing the lift values (H) determined in step (1.1)1，H2，H3，H4，H5…) and the sequence of shaft power values (N) determined in step (1.2)1，N2，N3，N4，N5…) are combined in pairs in sequence to form a head-shaft power data combination point (H) of the centrifugal pump with not less than 5 points1，N1)，(H2，N2)，(H3，N3)，(H4，N4)，(H5，N5)，…；
And (1.4) fitting the head-shaft power data combination points of the centrifugal pump obtained in the step (1.3) into a unitary quadratic function relation based on a least square method.
3. An evaluation device for implementing the centrifugal pump energy efficiency evaluation method of claims 1-2, applied in a centrifugal pump pumping system, the centrifugal pump pumping system comprising a centrifugal pump (10), a motor (20) mechanically connected to the centrifugal pump for driving the centrifugal pump to operate, an inlet pipe (30) and an outlet pipe (40) mechanically connected to an inlet and an outlet of the centrifugal pump (10), respectively, an inlet pressure sensor (50) and an outlet pressure sensor (60) mechanically connected to the inlet pipe (30) and the outlet pipe (40) of the centrifugal pump and in contact with fluid in the pipes, respectively, and an active power meter (70) electrically connected to the motor (20) for measuring active power of the motor (20) in real time, characterized in that: the device comprises a data input module (81), a data acquisition module (82), a data storage module (83), a data operation module (84) and a data display module (85):
the data input module (81), the data acquisition module (82), the data operation module (84) and the data display module (85) are electrically connected with the data storage module (83);
the data acquisition module (82) is electrically connected with the inlet pressure sensor (50), the outlet pressure sensor (60) and the active power meter (70);
the data input module (81) is used for manually inputting a lifting head-motor active power unitary quadratic function relation of the centrifugal pump and the annual running time of the centrifugal pump;
the data acquisition module (82) is used for synchronously acquiring the inlet pressure and the outlet pressure measured by the inlet pressure sensor (50) and the outlet pressure sensor (60) and the actual value of the active power of the motor measured by the active power meter (70) in real time;
the data storage module (83) is used for storing a data input value of the data input module (81), a data acquisition value of the data acquisition module (82) and a data operation value of the data operation module (84), and outputting the data operation value of the data operation module (84) to the data display module (85);
the data operation module (84) acquires relevant input data and acquisition data from the data storage module (83), calculates in real time to obtain centrifugal pump energy efficiency evaluation indexes such as an operating head value, a motor active power theoretical value, an energy efficiency coefficient, an energy efficiency score and potential annual energy conservation quantity of the centrifugal pump, and returns all calculation results to the data storage module (83);
and the data display module (85) is used for acquiring the operating lift value of the centrifugal pump, the theoretical value of the active power of the motor, the energy efficiency coefficient, the energy efficiency score, the potential annual energy saving quantity and other energy efficiency evaluation indexes of the centrifugal pump in real time from the data storage module (83) and displaying the indexes in real time.
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