CN105864019B - Pump the efficiency of pump accurate measurement method in thermal performance test efficiency measurement - Google Patents
Pump the efficiency of pump accurate measurement method in thermal performance test efficiency measurement Download PDFInfo
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- CN105864019B CN105864019B CN201610221160.8A CN201610221160A CN105864019B CN 105864019 B CN105864019 B CN 105864019B CN 201610221160 A CN201610221160 A CN 201610221160A CN 105864019 B CN105864019 B CN 105864019B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F17/00—Digital computing or data processing equipment or methods, specially adapted for specific functions
- G06F17/10—Complex mathematical operations
Abstract
The present invention relates to the efficiency of pump accurate measurement methods in a kind of pump thermal performance test efficiency measurement.At present in pumping thermal performance test efficiency measurement efficiency of pump result accuracy to pump inlet and outlet pressure temperature accuracy it is relatively high according to lazyness.The step of the present invention is as follows：With and only measured with verification qualified thermocouple A, pressure gauge A, thermocouple B and pressure gauge B, thermocouple A and pressure gauge A are first installed on to the water inlet of pump, and thermocouple B and pressure gauge B are installed on to the water outlet of pump and measured；Then thermocouple B and pressure gauge B are placed in the water inlet of same pump, and thermocouple A and pressure gauge A are placed in the water outlet that same pumps and measured, using pressure mean values P1 as the inlet pressure of this efficiency test pumped, using pressure mean values P2 as the water pressure that goes out of this efficiency test pumped, substitutes into formula and calculate the efficiency of pump.The present invention's is easy to operate, it is ensured that the efficiency for the pump that survey calculation comes out is more accurate.
Description
Technical field
The present invention relates to a kind of efficiency of pump accurate measurement methods, more particularly, to a kind of pump thermal performance test efficiency measurement
In efficiency of pump accurate measurement method.
Background technology
The prior art in pumping thermal performance test efficiency measurement, usually adopt by the inlet and outlet coolant-temperature gage pressure measurement method of pump
The inlet and outlet coolant-temperature gage (pressure) pumped with two thermocouple (pressure gauge) independent measurements finally takes every thermocouple during experiment
The average value of (pressure gauge) measured value, due to pump inlet and outlet coolant-temperature gage (pressure) to efficiency of pump test result weighing factor compared with
Greatly so that pump thermal performance test efficiency measurement in efficiency of pump result accuracy to pump inlet and outlet pressure temperature accuracy according to
Lazyness is relatively high, and testing accurate links, other experimental conditions satisfaction, other auxiliary flows in the case that other measures accurately,
The efficiency measurement result of feed pump the measurement accuracy of the out temperature of feed pump is relied on it is relatively high, and water circulating pump into
The measurement accuracy of outlet pressure influences the measurement result of Circulating Water Pump Efficiency bigger.《North China Electric Power University's journal》
Thermodynamics method disclosed in the 88-92 pages of the 4th phase of volume 27 in October, 2000 measures in the progress of the efficiency of pump, although note
The relatively good formula for calculating the efficiency of pump is carried, but the calculation formula is still influenced by pump inlet and outlet coolant-temperature gage (pressure)
It is larger, if wanted to the measurement accuracy of thermocouple come the inlet and outlet coolant-temperature gage (pressure) of measuring pump using existing measurement method
It asks very high, not only considerably increases the cost of investment of equipment, but also considerably increase the cost safeguarded to thermocouple, can also lead
It causes efficiency of pump measured deviation larger, and is difficult to exclude experiment random error and instrument error.
Invention content
It is an object of the invention to overcome above-mentioned deficiency existing in the prior art, and provide it is a kind of easy to operate, can be with
Ensure that the efficiency for the pump that survey calculation comes out more accurately pumps the accurately side of measurement of the efficiency of pump in thermal performance test efficiency measurement
Method.
Technical solution is used by the present invention solves the above problems：Pump efficiency in the pump thermal performance test efficiency measurement
Rate accurate measurement method, it is characterised in that：The step of the method, is as follows：With and only with the qualified thermocouple A of verification, pressure gauge
A, thermocouple B and pressure gauge B are measured, and thermocouple A and pressure gauge A be first installed on to the water inlet of pump, and by thermocouple B
It is installed on the water outlet of pump with pressure gauge B, the water inlet temperature Xl and water inlet of measuring pump are distinguished with thermocouple A and pressure gauge A
Pressure R1 the exit water temperature degree Yl of measuring pump and goes out water pressure Q1 respectively with thermocouple B and pressure gauge B；Equal stable conditions examination
DATA REASONING is carried out after testing beginning, thermocouple A, pressure gauge A, thermocouple B and pressure gauge B measure the water inlet temperature pumped respectively
It spends X1, water inlet pressure R1, exit water temperature degree Yl and goes out water pressure Q1, and carry out first time data acquisition, acquire original number
According to time Pass Test requirement；Then after equal first times data acquisition, thermocouple B and pressure gauge B are placed in same pump
Water inlet, and by thermocouple A and pressure gauge A be placed in same pump water outlet, carried out after waiting stable conditions on-test
DATA REASONING, thermocouple B and pressure gauge B measure respectively the water inlet temperature X2 pumped and water inlet pressure R2, thermocouple A and
Pressure gauge A measures the exit water temperature degree Y2 pumped and goes out water pressure Q2 respectively, and carries out second of data acquisition, and acquisition is former
Beginning data time Pass Test requirement；After data acquire, the temperature of water inlet temperature Xl and water inlet temperature X2 is calculated
Spend average value T1, the pressure mean values P1 of water inlet pressure R1 and water inlet pressure R2, exit water temperature degree Yl and exit water temperature degree
The temperature averages T2 of Y2, and go out water pressure Q1 and go out the pressure mean values P2 of water pressure Q2, then by temperature averages
Inlet water temperature of the T1 as this efficiency test pumped, using pressure mean values P1 as the inlet-pressure of this efficiency test pumped
Power pumps pressure mean values P2 as this using temperature averages T2 as the exit water temperature degree of this efficiency test pumped
Efficiency test goes out water pressure, substitutes into formula and calculates the efficiency of pump.
Preferably, the formula that the present invention calculates the efficiency of pump is as follows：
In formula：H --- lift, [m]；
P1--- inlet pressure, [Pa]；
P2--- outlet pressure, [Pa]；
ρ --- averag density, [kg/m3]；
G --- acceleration of gravity, [9.81m/s2]；
V1--- inlet velocity, [m/s]；
V2--- exit velocity, [m/s]；
Z1--- inlet pressure gauge center absolute altitude, [m]；
Z2--- delivery gauge center absolute altitude, [m].
In formula：Pu--- effective power, [kW]；
G --- rate of discharge, [t/h].
In formula：Pa--- feed pump shaft power, [kW]；
h2--- water supply pump discharge water specific enthalpy, [kJ/kg]；
h1--- feed pump Inlet water specific enthalpy, [kJ/kg]；
hx--- Sealing Water for Feedwater Pump water inlet specific enthalpy, [kJ/kg]；
Gx--- sealing water enters the flow of the pump housing, [t/h]；
Δ E --- feed pump bearing, pump housing heat dissipation and mechanical loss etc., [kW].
Under the conditions of feed pump field test Δ E can approximation take the G of (0.01~0.03) times2(h2-h1), industry can be met
The requirement for testing C class precisions and global optimization, takes
Δ E more Method for Accurate Calculation：
Δ E=Δs Em+Ex
In formula：Ex--- the energy that cooling water or oil absorb, [kW]；
Gmi--- cooling water or oil quality flow, [t/h]；
cph--- the specific heat capacity of cooling water or oil, [J/ (kg. DEG C)]；
t1i、t2i--- the out temperature of cooling water or oil, [DEG C].
ΔEm=Δ Em1+ΔEm2
In formula：ΔEm1--- sealing device leakage flow loses, [kW]；
Gxo--- sealing water circling water flow rate, [t/h]；
hxo--- sealing water return water enthalpy, [kJ/kg].
ΔEm2=PexA(te-ta)
In formula：ΔEm2--- the energy of pump housing radiation loss, [kW]；
Pex--- the radiation loss power of the pump housing can rule of thumb take 0.01 [kW/ (m2·℃)]；
A --- heat exchange area, [m2]；
te、ta--- water temperature, environment temperature in pump, [m2]。
In formula：η --- the water supply efficiency of pump.
Preferably, average value of the present invention is arithmetic mean of instantaneous value.
Preferably, experimental condition of the present invention and program meet test requirements document.
Compared with prior art, the present invention haing the following advantages and effect：Principle is simple, easy to implement, measure it is accurate, can
It leans on, stablize, general idea is unique, and the qualified pressure gauge of the thermocouple and two verifications for only needing two verifications qualified is applicable in
It is wide, advantageously reduce equipment cost.The present invention is in the case where using very simple method and without additionally increasing equipment
The accuracy of the efficiency of pump of measurement result can be improved, it is simply, practical, effectively.The present invention reduce experiment in measuring pump into
The experiment random error and instrument error for going out the temperature and pressure of saliva, can be improved the measurement accuracy of the efficiencies of pump.
Specific implementation mode
Below by embodiment, the present invention is described in further detail, following embodiment be explanation of the invention and
The invention is not limited in following embodiments.
Embodiment.
It is as follows that the present embodiment pumps the step of efficiency of pump accurate measurement method in thermal performance test efficiency measurement：With and only
It is measured with verification qualified thermocouple A, pressure gauge A, thermocouple B and pressure gauge B, first by thermocouple A and pressure gauge A installations
In the water inlet of pump, and thermocouple B and pressure gauge B are installed on to the water outlet of pump, are surveyed respectively with thermocouple A and pressure gauge A
The water inlet temperature Xl and water inlet pressure R1 for measuring pump, with thermocouple B and pressure gauge B distinguish measuring pump exit water temperature degree Yl and
Go out water pressure Q1；DATA REASONING, thermocouple A, pressure gauge A, thermocouple B and pressure gauge are carried out after equal stable conditions on-test
B measures the water inlet temperature X1 pumped, water inlet pressure R1, exit water temperature degree Yl and goes out water pressure Q1 respectively, and carries out
First time data acquire, acquisition initial data time Pass Test requirement；Then after equal first times data acquisition, by thermoelectricity
Even B and pressure gauge B is placed in the water inlet of same pump, and thermocouple A and pressure gauge A are placed in the water outlet of same pump,
DATA REASONING is carried out after equal stable conditions on-test, thermocouple B and pressure gauge B measure the water inlet temperature X2 pumped respectively
The exit water temperature degree Y2 pumped is measured respectively with water inlet pressure R2, thermocouple A and pressure gauge A and goes out water pressure Q2, and
Carry out second of data acquisition, acquisition initial data time Pass Test requirement；After data acquire, water inlet is calculated
The pressure mean values P1 of the temperature averages T1 of temperature Xl and water inlet temperature X2, water inlet pressure R1 and water inlet pressure R2,
The temperature averages T2 of exit water temperature degree Yl and exit water temperature degree Y2, and go out water pressure Q1 and go out the pressure of water pressure Q2
Average value P 2, then using temperature averages T1 as the Inlet water temperature of this efficiency test pumped, using pressure mean values P1 as
The inlet pressure of the efficiency test of this pump will using temperature averages T2 as the exit water temperature degree of this efficiency test pumped
Pressure mean values P2 goes out water pressure as this efficiency test pumped, substitutes into following formula and calculates the efficiency of pump：
In formula：H --- lift, [m]；
P1--- inlet pressure, [Pa]；
P2--- outlet pressure, [Pa]；
ρ --- averag density, [kg/m3]；
G --- acceleration of gravity, [9.81m/s2]；
V1--- inlet velocity, [m/s]；
V2--- exit velocity, [m/s]；
Z1--- inlet pressure gauge center absolute altitude, [m]；
Z2--- delivery gauge center absolute altitude, [m].
In formula：Pu--- effective power, [kW]；
G --- rate of discharge, [t/h].
In formula：Pa--- feed pump shaft power, [kW]；
h2--- water supply pump discharge water specific enthalpy, [kJ/kg]；
h1--- feed pump Inlet water specific enthalpy, [kJ/kg]；
hx--- Sealing Water for Feedwater Pump water inlet specific enthalpy, [kJ/kg]；
Gx--- sealing water enters the flow of the pump housing, [t/h]；
Δ E --- feed pump bearing, pump housing heat dissipation and mechanical loss etc., [kW].
Under the conditions of feed pump field test Δ E can approximation take the G of (0.01~0.03) times2(h2-h1), industry can be met
The requirement for testing C class precisions and global optimization, takes
Δ E more Method for Accurate Calculation：
Δ E=Δs Em+Ex
In formula：Ex--- the energy that cooling water or oil absorb, [kW]；
Gmi--- cooling water or oil quality flow, [t/h]；
cph--- the specific heat capacity of cooling water or oil, [J/ (kg. DEG C)]；
t1i、t2i--- the out temperature of cooling water or oil, [DEG C].
ΔEm=Δ Em1+ΔEm2
In formula：ΔEm1--- sealing device leakage flow loses, [kW]；
Gxo--- sealing water circling water flow rate, [t/h]；
hxo--- sealing water return water enthalpy, [kJ/kg].
ΔEm2=PexA(te-ta)
In formula：ΔEm2--- the energy of pump housing radiation loss, [kW]；
Pex--- the radiation loss power of the pump housing can rule of thumb take 0.01 [kW/ (m2·℃)]；
A --- heat exchange area, [m2]；
te、ta--- water temperature, environment temperature in pump, [m2]。
In formula：η --- the water supply efficiency of pump.
Average value in the present embodiment is arithmetic mean of instantaneous value.It measures for the first time and what second of measurement was exchanged both includes thermoelectricity
It is even, further include pressure gauge.Experimental condition and program meet test requirements document.
Such as when certain power station pump thermal performance efficiency measuring tests, pump is measured with two qualified thermocouples of verification first
Inlet and outlet coolant-temperature gage is respectively that 165.05 DEG C and 169.18 DEG C measure pump secondly this two thermocouple measurement location swaps
It is respectively 164.80 DEG C and 169.36 DEG C to import and export coolant-temperature gage；As can be seen from the above data, due to thermocouple system error
In the presence of making the inlet and outlet coolant-temperature gage error that single measurement pumps larger, and measurement method using the present invention then eliminates two
Systematic error between thermocouple measures the efficiency of pump for thermal performance test and provides more accurate, true data.Similarly,
The present invention also eliminates the systematic error between two pressure gauges.
Following table is the efficiency of pump result being calculated using the method in the present invention.
Furthermore, it is necessary to illustrate, the specific embodiment described in this specification, the shape of parts and components is named
Claiming etc. can be different, described in this specification above content is only to structure of the invention example explanation.It is all according to
The equivalence changes or simple change done according to the structure, feature and principle described in inventional idea of the present invention, are included in this hair
In the protection domain of bright patent.Those skilled in the art can do described specific embodiment various
The modify or supplement or adopt similar mode of various kinds substitutes, and without departing from structure of the invention or surmounts present claims
Range defined in book, is within the scope of protection of the invention.
Claims (4)
1. the efficiency of pump accurate measurement method in a kind of pump thermal performance test efficiency measurement, it is characterised in that：The method
Steps are as follows：With and only measured with verification qualified thermocouple A, pressure gauge A, thermocouple B and pressure gauge B, first by thermoelectricity
Even A and pressure gauge A is installed on the water inlet of pump, and thermocouple B and pressure gauge B are installed on to the water outlet of pump, with thermocouple A
The water inlet temperature Xl and water inlet pressure R1 that measuring pump is distinguished with pressure gauge A distinguish measuring pump with thermocouple B and pressure gauge B
Exit water temperature degree Yl and go out water pressure Q1；DATA REASONING, thermocouple A, pressure gauge are carried out after equal stable conditions on-test
A, thermocouple B and pressure gauge B measures the water inlet temperature X1 pumped, water inlet pressure R1, exit water temperature degree Yl and goes out respectively
Water pressure Q1, and first time data acquisition is carried out, acquisition initial data time Pass Test requirement；Then equal first times data
After acquisition, thermocouple B and pressure gauge B are placed in the water inlet of same pump, and thermocouple A and pressure gauge A are placed in
The water outlet of same pump, carries out DATA REASONING, thermocouple B and pressure gauge B are measured respectively after waiting stable conditions on-test
Water inlet temperature X2 and water inlet pressure R2, thermocouple A and pressure gauge A to pump measure the exit water temperature degree Y2 pumped respectively
With go out water pressure Q2, and carry out second of data acquisition, acquisition initial data time Pass Test requirement；Data acquisition terminates
Afterwards, the temperature averages T1 of water inlet temperature Xl and water inlet temperature X2, water inlet pressure R1 and water inlet pressure is calculated
The temperature averages T2 of the pressure mean values P1 of R2, exit water temperature degree Yl and exit water temperature degree Y2, and go out water pressure Q1 and
Go out the pressure mean values P2 of water pressure Q2, then using temperature averages T1 as the Inlet water temperature of this efficiency test pumped,
Using pressure mean values P1 as the inlet pressure of this efficiency test pumped, tried temperature averages T2 as this efficiency pumped
The exit water temperature degree tested substitutes into formula and calculates pump using pressure mean values P2 as the water pressure that goes out of this efficiency test pumped
Efficiency.
2. the efficiency of pump accurate measurement method in pump thermal performance test efficiency measurement according to claim 1, feature
It is：The formula for calculating the efficiency of pump is as follows：
In formula：H --- lift, [m]；
P1--- inlet pressure, [Pa]；
P2--- outlet pressure, [Pa]；
ρ --- averag density, [kg/m3]；
G --- acceleration of gravity, [9.81m/s2]；
V1--- inlet velocity, [m/s]；
V2--- exit velocity, [m/s]；
Z1--- inlet pressure gauge center absolute altitude, [m]；
Z2--- delivery gauge center absolute altitude, [m]；
In formula：Pu--- effective power, [kW]；
G --- rate of discharge, [t/h]；
In formula：Pa--- feed pump shaft power, [kW]；
h2--- water supply pump discharge water specific enthalpy, [kJ/kg]；
h1--- feed pump Inlet water specific enthalpy, [kJ/kg]；
hx--- Sealing Water for Feedwater Pump water inlet specific enthalpy, [kJ/kg]；
Gx--- sealing water enters the flow of the pump housing, [t/h]；
Δ E --- feed pump bearing, pump housing heat dissipation and mechanical loss, [kW]；
Δ E takes 0.01~0.03 times of G under the conditions of feed pump field test2(h2-h1), can meet commerical test C class precisions and
The requirement of global optimization,
Or using Δ E more Method for Accurate Calculation：
Δ E=Δs Em+Ex
In formula：Ex--- the energy that cooling water or oil absorb, [kW]；
Gmi--- cooling water or oil quality flow, [t/h]；
cph--- the specific heat capacity of cooling water or oil, [J/ (kg. DEG C)]；
t1i--- the inlet temperature of cooling water or oil, [DEG C]；
t2i--- the outlet temperature of cooling water or oil, [DEG C]；
ΔEm=Δ Em1+ΔEm2
In formula：ΔEm1--- sealing device leakage flow loses, [kW]；
Gxo--- sealing water circling water flow rate, [t/h]；
hxo--- sealing water return water enthalpy, [kJ/kg]；
ΔEm2=PexA(te-ta)
In formula：ΔEm2--- the energy of pump housing radiation loss, [kW]；
Pex--- the radiation loss power of the pump housing can rule of thumb take 0.01 [kW/ (m2·℃)]；
A --- heat exchange area, [m2]；
te--- water temperature in pump, [DEG C]；
ta--- environment temperature, [DEG C]；
In formula：η --- the water supply efficiency of pump.
3. the efficiency of pump accurate measurement method in pump thermal performance test efficiency measurement according to claim 1, feature
It is：The pressure mean values and temperature averages are arithmetic mean of instantaneous value.
4. the efficiency of pump accurate measurement method in pump thermal performance test efficiency measurement according to claim 1, feature
It is：Experimental condition and program meet test requirements document.
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| CN106246528B (en) * | 2016-08-10 | 2018-07-17 | 国网河北省电力公司电力科学研究院 | A kind of test method of steam feed pump |
| CN108050053B (en) * | 2017-12-04 | 2020-05-01 | 广西电网有限责任公司电力科学研究院 | Efficiency testing method for condensate pump |
| CN108019344B (en) * | 2017-12-04 | 2020-06-12 | 广西电网有限责任公司电力科学研究院 | Method for testing efficiency of electric water supply pump set |
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