CN108680347A - A kind of impurity environment lower valve discharge characteristic identification method - Google Patents
A kind of impurity environment lower valve discharge characteristic identification method Download PDFInfo
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- CN108680347A CN108680347A CN201810456968.3A CN201810456968A CN108680347A CN 108680347 A CN108680347 A CN 108680347A CN 201810456968 A CN201810456968 A CN 201810456968A CN 108680347 A CN108680347 A CN 108680347A
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- G—PHYSICS
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- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
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Abstract
The present invention provides a kind of impurity environment lower valve discharge characteristic identification method comprising " three-wave-length " testing program is " pattern, comparison and impurity experiment ", based on the experimental data processing of analysis of uncertainty and the methods of experiment acceptance criteria, equipment strip inspection；It is carried out according to following steps, step 1 completes experiment preparation as requested；Step 2, type approval test determine that subsequent handling needs the concentration of impurity to be added；Step 3, Comparability test examine the accuracy of through-flow performance and experimental rig of the valve under clear water state, and form the correction data sample being subsequently used under each aperture of valve of impurity experiment；Step 4, discharge coefficient of the impurity experimental examination valve under trash flow pendular ring border are to determine whether to meet acceptance criteria；Valve is carried out internal structure dismantling inspection by step 5.This method has been filled up at present for the blank of the test method under impurity-free environment in the course of receiving of valve；Impurity operating mode lower valve discharge characteristic evaluation criteria can be made, the through-current capability judgement for valve in impurity operating mode provides foundation.
Description
Technical field
The present invention relates to nuclear power station and industrial valve experimental examination technical fields more particularly to a kind of impurity environment lower valve
Door discharge characteristic identification method.
Background technology
Currently, the valve used in nuclear power station have no specifically for the inspection project in impurity environment under accident conditions with
And corresponding assessment level, it is unknown that this so that whether valve can be suitably used for accident conditions, is brought to reduce accident conditions
Harm, it is necessary to the performance test under impurity environment is carried out to the valve of supplied materials.
Invention content
Technical problem to be solved by the present invention lies in, a kind of impurity environment lower valve discharge characteristic identification method is provided,
It has filled up current technology and cannot achieve the blank under simulated accident operating mode in impurity environment, being tested for the property to valve.
In order to solve the above technical problem, the present invention provides a kind of impurity environment lower valve discharge characteristic identification methods, use
Whether the valve to examine and assess buying meets the design requirement and acceptance criteria of nuclear power station operation, may include：
Step S1, the preparation stage is tested, by experimental enviroment, experiment instrument, test loop, Test Data Acquisition System and survey
Test system debugs completion as requested；
Step S2, the type approval test stage determines that subsequent handling needs the concentration of impurity to be added；
S2-1, it replaces valve to be tested to access test loop with a straight pipe, adds certain density impurity and enter institute
State test loop；
During S2-2, the type approval test, test verification is sampled according to preset frequency；
If S2-3, analytical control enter next experiment-comparison as a result, the inspection result of impurity concentration reaches design requirement
Experiment；If the inspection result of impurity concentration is not up to design requirement, the concentration return S2-1 that need to adjust the impurity of addition carries out weight
New experiment is until the inspection result of impurity concentration reaches design requirement；
Step S3, the Comparability test stage examines the valve in the test loop logical under clear water flow regime
The test accuracy of fluidity energy and experimental rig, and form the correction data being subsequently used under each aperture of valve of impurity experiment
Sample；；
S3-1, the valve to be checked is linked into test loop；
S3-2, the adjustment valve to the preset different opening of test requirements document are tested；
S3-3, the discharge coefficient measured under each aperture state is analyzed, and is provided with the valve production firm
Inspection detection data compared, verify it is described access test loop the valve through-flow performance；If verification knot
Fruit is to be consistent then to enter next experiment-impurity experiment；The valve more renewed if being not to be inconsistent if verification result returns to 3-1 and is tried
It tests；If test result is not inconsistent still, Adjustment Tests device is checked, the valve not being inconsistent otherwise is retracted into producer and is examined again；
Step S4, impurity experimental stage, it is described to judge to examine discharge coefficient of the valve under trash flow pendular ring border
Whether valve meets acceptance criteria；
S4-1, it is added in impurity to the flow liquid of the test loop according to the concentration that the type approval test is determined；
Aperture when S4-2, the adjustment valve are to actual motion；
During S4-3, impurity experiment, test inspection is sampled according to preset frequency at the valve export
Test, respectively obtain obstruction stream mode under discharge coefficient and impurities concentration data and it is non-obstruction stream mode under discharge coefficient and
Impurities concentration data；
S4-4, evaluate whether the valve meets acceptance criteria using preset acceptance criteria；Mark is checked and accepted if meeting
Criterion enters subsequent processing and carries out dismantling inspection to the valve；It was analyzed if being unsatisfactory for acceptance criteria and then needing to enter to supplement
Cheng Zhong；
S4-5, supplement analysis is carried out to test result, the conclusion for supplementing analysis is necessary to determine whether clogging occurred；
S4-6, if it is determined that do not block, need return to step S4 to re-start impurity experiment；
S4-7, if it is determined that there is clogging, then dismantle the valve into subsequent processing and carry out blocking characteristic analysis；
S4-8, the valve check and acceptance result are unqualified, and result are fed back to production firm, it is required to be transformed；
Step S5, it is that the qualified valve carries out internal structure dismantling by check and acceptance result, checks whether there is impurity silting
And check surface appearance, it photographs to record；
Step S6, the described valve acceptance(check).
In an alternate embodiment of the invention, valve flow characteristic identification method is adjusted under the impurity environment using uncertain point
It analyses to handle test data.
In an alternate embodiment of the invention, the device carried out used in the experiment of the flow characteristics of regulating valve identification includes anti-settling
Plash, agitating device, anti-deposition medium circulation pipe road, thermostat and sampler.
In an alternate embodiment of the invention, the experimental enviroment need to keep room temperature within ± 10 DEG C.
In an alternate embodiment of the invention, the type approval test stage of the step S2 needs the position for installing the regulating valve to need
Replace the regulating valve access in the test loop using straight tube.
In an alternate embodiment of the invention, the type approval test palpus continuous service of the step S2 20 hours, sampling frequency is experiment
Primary at interval of sampling in 0.5 hour in 2 hours after beginning, primary at interval of sampling in 1 hour later, sampling number must be more than 20
It is secondary.
In an alternate embodiment of the invention, the obtained liquid that samples must be filtered using high mesh filter screen, be dried to filter residue
It handles, weigh and calculate concentration, obtain sampling and testing inspection data.
In an alternate embodiment of the invention, polynomial regression analysis is carried out to the sampling and testing inspection data, judges the type
The situation of change and trend of impurity concentration during formula experiment, to judge whether to need to add impurity.
In an alternate embodiment of the invention, in the Comparability test stage of step S3, the value range of the preset different opening
For 0%-100%.
In an alternate embodiment of the invention, the opening value takes 0%, 25%, 50%, 75%, 100% and actual motion respectively
Aperture at least measures the regulating valve 5 discharge coefficients under each aperture.
In the implementation of optional example, the valve is respectively necessary for flowing operating mode and resistance in non-obstruction under actual motion aperture
2 groups and 4 groups of discharge coefficients are measured under plug flow operating mode.
In an alternate embodiment of the invention, the control valve opening that the impurity of the step S4 is tested is set as actual motion and opens
Degree.
In an alternate embodiment of the invention, the sampling frequency during the impurity experiment is every in 2 hours after on-test
Interval sampling in 0.5 hour is primary, primary at interval of sampling in 1 hour later, and sampling number must be more than 20 times.
In an alternate embodiment of the invention, the flow during the impurity experiment Jing Guo the regulating valve and front and back pressure difference must become
In constant until obtaining stable discharge coefficient, the impurity test period otherwise will be extended.
In an alternate embodiment of the invention, the obstruction stream and non-obstruction stream mode are calculated using the method for analysis of uncertainty
Under the valve discharge coefficient Composite Seismogram.
In an alternate embodiment of the invention, the fiducial probability of uncertainty of measurement is chosen for 95% to be divided as error range
It analyses, the average flow coefficient deviation under the average flow coefficient and In water under impurity operating mode under same operating status is being set
The uncertainty of measurement error range for believing probability interval, that is, meet formula：
Indicate that the regulating valve meets design requirement in the impurity operating mode operation characteristic, wherein U synthesizes for discharge coefficient
Uncertainty.
In an alternate embodiment of the invention, the valve that the identification method is equally applicable to examine and assess other industrial uses is
It is no to meet design requirement and acceptance criteria.
In summary, the advantageous effect of the embodiment of the present invention is：The impurity environment lower valve discharge characteristic mirror of the present invention
Determine method, on the one hand, pass through the accuracy and properties of product measured with the contrast verification experimental rig of producer design data；One side
Face the fortune under valve impurity operating mode is verified by the real-time comparison of discharge characteristic of the valve to be checked under clear water and impurity operating mode
Row characteristic；On the one hand, impurity operating mode lower valve discharge characteristic evaluation criteria has been made, has been through-flow energy of the valve in impurity operating mode
Power judgement provides foundation.It has filled up at present for the blank of the test method under impurity-free environment in the course of receiving of valve.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is that a kind of experiment process of one embodiment of impurity environment lower valve discharge characteristic identification method of the present invention shows
It is intended to.
Fig. 2 is that impurity experiment takes in a kind of one embodiment of impurity environment lower valve discharge characteristic identification method of the present invention
Sample analytical table.
Fig. 3 is that impurity was tested in a kind of one embodiment of impurity environment lower valve discharge characteristic identification method of the present invention
The full curve figure that discharge coefficient is compared with acceptance criteria in journey.
Specific implementation mode
The explanation of following embodiment is refer to the attached drawing, can be to the specific embodiment implemented to the example present invention.
The embodiment of the present invention provides a kind of impurity environment lower valve discharge characteristic identification method, to examine and assessment is adopted
Whether the valve of purchase meets the design requirement and acceptance criteria of nuclear power station operation, specific experiment process figure such as Fig. 1 institutes
Show, it may include：
Step S1, the preparation stage is tested, by experimental enviroment, experiment instrument, test loop, Test Data Acquisition System and survey
Test system debugs completion as requested；
Step S2, the type approval test stage determines that subsequent handling needs the concentration of impurity to be added；
S2-1, it replaces valve to be tested to access test loop with a straight pipe, adds certain density impurity and enter institute
State test loop；
During S2-2, the type approval test, test verification is sampled according to preset frequency；
If S2-3, analytical control enter next experiment-comparison as a result, the inspection result of impurity concentration reaches design requirement
Experiment；If the inspection result of impurity concentration is not up to design requirement, the concentration return S2-1 that need to adjust the impurity of addition carries out weight
New experiment is until the inspection result of impurity concentration reaches design requirement；
Step S3, the Comparability test stage examines the valve in the test loop complete under clear water flow regime
Good degree；
S3-1, the valve to be checked is linked into test loop；
S3-2, the adjustment valve to the preset different opening of test requirements document are tested；
S3-3, the discharge coefficient measured under each aperture state is analyzed, and is provided with the valve production firm
Inspection detection data compared, verify it is described access test loop the valve through-flow performance；If verification knot
Fruit is to be consistent then to enter next experiment-impurity experiment；The valve more renewed if being not to be inconsistent if verification result returns to 3-1 and is tried
It tests；If test result is not inconsistent still, Adjustment Tests device is checked, the valve not being inconsistent otherwise is retracted into producer and is examined again；
Step S4, impurity experimental stage, it is described to judge to examine discharge coefficient of the valve under trash flow pendular ring border
Whether valve meets acceptance criteria；
S4-1, it is added in impurity to the flow liquid of the test loop according to the concentration that the type approval test is determined；
Each aperture during S4-2, the adjustment valve to the Comparability test；
During S4-3, impurity experiment, test inspection is sampled according to preset frequency at the valve export
Test, respectively obtain obstruction stream mode under discharge coefficient and impurities concentration data and it is non-obstruction stream mode under discharge coefficient and
Impurities concentration data；
S4-4, evaluate whether the valve meets acceptance criteria using preset acceptance criteria；Mark is checked and accepted if meeting
Criterion enters subsequent processing and carries out dismantling inspection to the valve；It was analyzed if being unsatisfactory for acceptance criteria and then needing to enter to supplement
Cheng Zhong；
S4-5, supplement analysis is carried out to test result, the conclusion for supplementing analysis is necessary to determine whether clogging occurred；
S4-6, if it is determined that do not block, need return to step S4 to re-start impurity experiment；
S4-7, if it is determined that there is clogging, then dismantle the valve into subsequent processing and carry out blocking characteristic analysis；
S4-8, the valve check and acceptance result are unqualified, and result are fed back to production firm, it is required to be transformed；
Step S5, it is that the qualified valve carries out internal structure dismantling by check and acceptance result, checks whether there is impurity silting
And check surface appearance, it photographs to record；
Step S6, the described valve acceptance(check).
As an example, the present embodiment carries out Incoming Quality Control experiment to elaborate on how to make for the regulating valve of used in nuclear power station
With the discharge characteristic identification method.The experimental rig that the experiment is used be it is a set of comprising anti-settling plash and agitating device, it is anti-settling
The impurity test bed of product medium circulation pipeline, sampling system, constant temperature system, data Collection ＆ Processing System etc..Experiment exists respectively
It is executed under the conditions of the water impurity of clear water and test requirements document concentration, medium temperature should control in room temperature ± 10 DEG C during experiment.
First stage (experiment preparation stage)：
According to the operating condition for the device systems that regulating valve to be checked needs to access, impurity preparation method is determined, consider experiment
Impurity is required supplementation in the process, therefore is configured according to 2 times of demands；Impurity need to be by experimental concentration and tank water loading amount number of computations
Afterwards, it configures, stir evenly in advance in preparing container, experimental tank is subsequently poured into the form of suspension；
Regulating valve access testing stand to be checked circuit is substituted with straight pipe, checkout facility platform power switch is closed, starts and concentrate
Control system checks that each equipment meter status is normal, and checkout facility platform is supplied water and drained, gas exhaust piping is unimpeded；
Testing stand major loop separation valve door is opened, and closes sampling line valve and constant temperature system valve, is filled with to circuit
Clear water starts circulating pump, and executes exhaust；
Switch constant temperature system pipeline, carries out system flush, draining respectively；
The impurity configured is added in water-filling again.
Second stage (type approval test stage)：
The purpose in the stage is the equipment performance in rating test circuit, detects in circuit other portions in addition to regulating valve to be checked
Divide the retention situation to impurity, impurity concentration to be added is needed when carrying out impurity experiment to determine.
Blender is put into, cycle pump frequency and throttle valve opening are adjusted, is deposited in pipeline to reduce impurity, ensures circuit
Flow is more than 3.5m3/ h, and record actual flow；
Prebake and number are carried out to filter bag, notice that drying temperature is no more than 60 DEG C；
Stable operation 20min, samples at sampling line, and filtered filter bag is put into drying box by filtering and sampling water；
After drying about 6h, filter bag is taken out, is weighed for the first time；After filter bag is placed again into drying box 1h, filter bag is taken out, is weighed for the second time；Two
Secondary mass difference of weighing is less than 0.1g, then records weight at this time, be otherwise put into drying box and continue to dry；
Trial zone impurity concentration is analyzed according to sampled data, if test requirements document is not achieved in trial zone concentration, equal proportion adds
Add impurity to be modified, and tune up flow, until trial zone meets concentration requirement, records the impurity level put at this time and pipeline stream
Amount；
Continuous service 20h is sampled in sample tap, and preceding 2 hours of on-test are primary every half an hour sampling,
Each hour sampling later is primary, until off-test, starts first to bleed off the water of about 10L, refund pond, then take per sub-sampling
Sample 10L；Sample time, temperature, flow, the corresponding filter bag number of corresponding pipeline etc. are recorded in record sheet；At the 1st time and
After 12 sub-samplings, sampling analysis again is carried out to filtered fluid, sampling liquid, which is put into drying box, directly dries；
All sampled datas are calculated and counted, using polynomial regression analysis, during judging long run test
The situation of change and trend of impurity concentration, to judge whether to need to add impurity；
Data are recorded and kept, type approval test is terminated.
Phase III (Comparability test stage)：
The purpose in the stage is to examine the intact degree of regulating valve, if it is consistent with the parameter that manufacturer provides, after guarantee
The accuracy of continuous experiment.Comparability test need to carry out discharge characteristic detection respectively under two kinds of operating modes, and one is regular flow operating mode
Under (i.e. valve general measure aperture), secondly for (i.e. valve actual motion aperture) under particular flow rate operating mode.In one example,
Non- obstruction stream operating mode is only measured under 0%, 25%, 50%, 75＆, 100% aperture, it is each to survey 5 groups；In 20% work of practical aperture
Under condition, 4 groups are measured in the case where obstruction flows respectively, 2 groups of measurement is left in non-obstruction.More specifically：
Discharge characteristic detection under regular flow operating mode：
Water impurity and detergent line are emptied, circuit straight pipe is removed, is packed into regulating valve to be checked；
Start circulating pump, it is 100% rated frequency that its running frequency, which is arranged, carries out steam discharge；
After piping flow is stablized, full trrottle before and after regulating valve, adjustment regulating valve to 0% aperture is made to carry out aperture note
Record；
The frequency for adjusting pump pays attention to ensureing that pipeline operating status obstruction stream does not occur (by front and back pressure difference, pressure, flow
Equal data analyses), record pump frequency；
Make system stable operation for a period of time, after observing stability of flow, start recording data；
By the frequency of two groups of data of acquisition per minute, after record stable operation before and after 10min interior conduits flow, regulating valve
Differential pressure, line temperature adjust upstream pressure, adjust downstream pressure, pipeline fluidised form；
Change pump frequency, notices that pressure difference change value is more than 15kPa before and after ensureing at regulating valve valve, needs to measure 5 kinds altogether
Discharge coefficient under flow；
Make system stable operation for a period of time, after observing stability of flow, record requires data again；
Regulating valve is sequentially adjusted in 25%, 50%, 75% and 100% aperture, is repeated the above steps；
Analysis measurement data simultaneously calculates discharge coefficient, is compared with manufacturer data, determines the accuracy of experimental rig；
Circulating pump is closed, the experiment under non-obstruction stream operating mode is terminated.
Discharge characteristic detection under particular flow rate operating mode：
Full trrottle before and after regulating valve to be checked, adjustment regulating valve to 20% aperture；
The frequency for adjusting pump pays attention to ensureing that pipeline operating status flows for non-obstruction, has recorded pump frequency；
Make system stable operation for a period of time, after observing stability of flow, start recording data；
By the frequency of two groups of data of acquisition per minute, after record stable operation in 10min before and after piping flow, regulating valve
Differential pressure, line temperature adjust upstream pressure, adjust downstream pressure, pipeline fluidised form；
Change pump frequency, notices ensureing that the front and back pressure difference change value at regulating valve valve is more than 15kPa, need measurement 2 altogether
Discharge coefficient under kind pump discharge；
Pump frequency is tuned up, is flowed until pipeline operating status is obstruction；
By the frequency of two groups of data of acquisition per minute, after record stable operation in 10min before and after piping flow, regulating valve
Differential pressure, line temperature adjust upstream pressure, adjust downstream pressure, pipeline fluidised form；
Change pump frequency in obstruction stream range, pays attention to ensureing that the front and back pressure difference change value at regulating valve valve is more than
15kPa needs to measure the flow coefficient Cv under 4 kinds of pump discharges altogetherIt compares；
Circulating pump is closed, test data is kept, terminates the experiment under obstruction stream operating mode.
Fourth stage (impurity experimental stage)：
The purpose in the stage is to adjust regulating valve to the aperture of actual motion requirement, in obstruction stream and non-obstruction stream mode
It is lower to measure flow coefficient Cv respectivelyImpurity, and each flow coefficient Cv to measuringImpurityCarry out analysis of uncertainty.
Impurity is tested：
Keep Comparability test pipeline constant, regulating valve is maintained at 20% aperture；
Circulating pump is restarted, concentration is corrected according to the impurity that type approval test determines, impurity is added；
If requiring supplementation with impurity during determining long run test in type approval test, the press-type within preceding 8 hours of experiment
Formula test result carries out impurity supplement, to maintain test loop impurity concentration to meet experimental concentration requirement；
2 hours of on-test are primary every half an hour sampling, each hour sampling later is primary, until experiment
Terminate, starts first to bleed off the water of about 10L per sub-sampling, refund pond, then sample 10L.It is right after the 1st time and the 12nd sub-sampling
Filtered fluid carries out sampling analysis again；
Sampled data is calculated and is counted, using polynomial regression analysis, it is ensured that impurity is dense during long run test
Degree meets test requirements document, such as Fig. 2 always；
Impurity operating mode discharge coefficient is carried out according to Comparability test method to the regulating valve under the aperture to measure；
A length of 20 hours when experiment test if the flow and front and back pressure difference by regulating valve do not tend to be constant by extending
Time, until obtaining stable flow coefficient CvImpurityNumerical value；
Circuit empties, and cleans and outaged equipment, end impurity are tested.
Data processing (analysis of uncertainty)：
Each measurement item in being detected for discharge coefficient measures uncertainty calculation, and uncertainty of measurement will be used as and miss
Difference analyses data, the formulation of the acceptance criteria for the discharge characteristic qualification test.
Flow measurement uncertainty is calculated first, and wherein A classes uncertainty is calculated by Bessel Formula, B class uncertainties
Indicating value uncertainty and centralized control system including instrument itself read the secondary meter uncertainty of transmitter data, according to instrument
Calibrated and calculated indicating value uncertainty, secondary meter uncertainty are then calculated by system adjustment data, and flow measurement uncertainty is
The root mean square of above-mentioned A/B classes uncertainty；Differential pressure uncertainty, inlet pressure uncertainty are calculated with same method；Finally, sharp
Show that obstruction stream and non-obstruction flow down the combined standard uncertainty of valve flow coefficient, formula with Transmitting error cofficient calculating method
It is as follows：
Under the premise of meeting engineering measurement accuracy, the flow coefficient Cv that is calculated in conjunction with above formulaImpurity, optional
It is that 95% (k=2) is analyzed as error range to take uncertainty of measurement fiducial probability, i.e., equipment is flat under impurity operating mode
Equal discharge coefficient and the average flow coefficient deviation under In water equally under operating status fiducial probability section measurement not
In degree of certainty error range, meet the situation shown in following formula：
(wherein U be discharge coefficient Composite Seismogram), then can operation characteristic of the definition apparatus under impurity operating mode with it is clear
Almost the same under water condition, impurity operating mode operation characteristic meets design requirement (inspection result in Fig. 3 is to meet the requirements), this
Sample can be used as the examination assessment level of the regulating valve with this.
Certainly, for detection caused by the non-regulated valve plug plug that occurs in the process of impurity experiment and mistake is being calculated, it can be with
The mode for taking supplement to analyze, dismantling inspection is carried out to the regulating valve of access system, to ensure the accuracy checked and accepted.
Disassemble examination phase：
The regulating valve for having done impurity experiment is removed from test loop, is disassembled and is come so that its internal structure
It is placed under visibility status, has further checked whether impurity silting, and check its surface state, photograph to record.
Situation one：If the conclusion tested by impurity is to meet acceptance criteria, and internal without silting, then proving should
Regulating valve acceptance(check) can notify production firm's acceptance(check) to be purchased use.
Situation two：If the conclusion tested by impurity is not meet acceptance criteria, and there is silting in inside, then shows
Regulating valve examination is unqualified, need to carry out blocking characteristic analysis and notify production firm's examination is unqualified must be improved.
Situation three：If the conclusion tested by impurity is not meet acceptance criteria, but inside then shows without silting
There is silting in other positions in the test loop, need to clean up the silting in circuit, and the regulating valve is linked into examination again
It tests in circuit and re-starts impurity experiment, the result until obtaining situation one or situation two could stop testing.
Situation four：If the conclusion tested by impurity is to meet acceptance criteria, but internal structure has impurity siltation,
Then showing impurity temporarily does not influence the passage component of valve, further need to verify and observe influence or right of the impurities accumulation to valve
The operation and maintenance proposition of valve periodically opens and inspect requirement.
The testing and evaluation method that above impurity environment lower valve discharge characteristic identification method is related to includes：" three-wave-length "
(i.e. " type approval test, Comparability test, impurity experiment ") testing program includes " calibration is compared and verified " system, can both be examined
The accuracy that experimental rig measures, and the performance under valve impurity operating mode to be checked, integrality and enforceability can be examined, it tests
Data processing precision is high, can be used as the operation characteristic qualification test side of nuclear power station and other industrial regulating valves under impurity operating mode
Method.
By above description it is found that the beneficial effects of the present invention are：The impurity environment lower valve discharge characteristic of the present invention
Identification method, on the one hand, pass through the accuracy measured with the contrast verification experimental rig of producer design data；On the one hand, pass through
The operation characteristic under valve impurity operating mode is verified in the real-time comparison of discharge characteristic of the valve to be checked under clear water and impurity operating mode；
On the one hand, impurity operating mode lower valve discharge characteristic evaluation criteria has been made, has been that valve judges in the through-current capability of impurity operating mode
Provide foundation.It has filled up at present for the blank of the test method under impurity-free environment in the course of receiving of valve.
The above disclosure is only the preferred embodiments of the present invention, cannot limit the right model of the present invention with this certainly
It encloses, therefore equivalent changes made in accordance with the claims of the present invention, is still within the scope of the present invention.
Claims (17)
1. a kind of impurity environment lower valve discharge characteristic identification method, whether the valve to examine and assess buying meets
The design requirement and acceptance criteria of nuclear power station operation, which is characterized in that including：
Step 1, experiment preparation stage, by experimental enviroment, experiment instrument, test loop, Test Data Acquisition System and test system
System as requested complete by debugging；
Step 2, type approval test stage determine that subsequent handling needs the concentration of impurity to be added；
2-1, it replaces valve to be tested to access test loop with a straight pipe, adds certain density impurity and enter the experiment
Circuit；
During 2-2, the type approval test, test verification is sampled according to preset frequency；
If 2-3, analytical control enter next experiment-Comparability test as a result, the inspection result of impurity concentration reaches design requirement；
If the inspection result of impurity concentration is not up to design requirement, the concentration return 2-1 that need to adjust the impurity of addition is tested again
Until the inspection result of impurity concentration reaches design requirement；
Step 3, Comparability test stage examine through-flow performance of the valve in the test loop under clear water flow regime
And the test accuracy of experimental rig, and form the correction data sample being subsequently used under each aperture of valve of impurity experiment；
3-1, the valve to be checked is linked into test loop；
3-2, the adjustment valve to the preset different opening of test requirements document are tested；
3-3, the inspection discharge coefficient measured under each aperture state analyzed, and provided with the valve production firm
Detection data is compared, and the through-flow performance of the valve of the access in test loop is verified；If verification result is phase
Fu Ze enters next experiment-impurity experiment；The valve more renewed if being not to be inconsistent if verification result returns to 3-1 and is tested；If
Test result is not inconsistent still, then checks Adjustment Tests device, and the valve not being inconsistent otherwise is retracted producer and is examined again；
Step 4, impurity experimental stage examine discharge coefficient of the valve under trash flow pendular ring border to be to judge the valve
It is no to meet acceptance criteria；
4-1, it is added in impurity to the flow liquid of the test loop according to the concentration that the type approval test is determined；
Aperture when 4-2, the adjustment valve to default each aperture and actual motion；
During 4-3, impurity experiment, it is sampled test verification according to preset frequency at the valve export, point
The discharge coefficient and impurity under the discharge coefficient and impurities concentration data and non-obstruction stream mode under obstruction stream mode are not obtained
Concentration data；
4-4, evaluate whether the valve meets acceptance criteria using preset acceptance criteria；If meet acceptance criteria then into
Enter subsequent processing and dismantling inspection is carried out to the valve；If being unsatisfactory for acceptance criteria then to need to enter in supplement analytic process；
4-5, supplement analysis is carried out to test result, the conclusion for supplementing analysis is necessary to determine whether clogging occurred；
4-6, if it is determined that do not block, need return to step 4 to re-start impurity experiment；
4-7, if it is determined that there is clogging, then dismantle the valve into subsequent processing and carry out blocking characteristic analysis；
4-8, the valve check and acceptance result are unqualified, and result are fed back to production firm, it is required to be transformed；
Check and acceptance result is that the qualified valve carries out internal structure dismantling by step 5, is checked whether there is impurity silting and is checked
Surface appearance photographs to record；
Step 6, the valve acceptance(check).
2. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that the impurity ring
Border lower valve discharge characteristic identification method handles test data using analysis of uncertainty.
3. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that carry out the valve
Device used in the experiment of door discharge characteristic identification includes anti-settling plash, agitating device, anti-deposition medium circulation pipe road, perseverance
Warm device and sampler.
4. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that the proving ring
Border need to keep room temperature within ± 10 DEG C.
5. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that the step 2
The type approval test stage, need the position for installing the valve that valve access need to be replaced to test back described using straight tube
Lu Zhong.
6. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that the step 2
Type approval test must continuous service 20 hours, sampling frequency is in 2 hours after on-test at interval of sampling one in 0.5 hour
Secondary, primary at interval of sampling in 1 hour later, sampling number must be more than 20 times.
7. impurity environment lower valve discharge characteristic identification method according to claim 6, which is characterized in that described to sample
To liquid must be filtered using high mesh filter screen, drying and processing is carried out to filter residue, weighs and calculates concentration, obtains sampling and testing inspection
Data.
8. impurity environment lower valve discharge characteristic identification method according to claim 7, which is characterized in that the sampling
Test verification data carry out polynomial regression analysis, judge the situation of change of impurity concentration during the type approval test and become
Gesture, to judge whether to need to add impurity.
9. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that the ratio of step 3
To in experimental stage, the value range of the preset different opening is 0%-100%.
10. impurity environment lower valve discharge characteristic identification method according to claim 9, which is characterized in that the aperture
Value takes 0%, 25%, 50%, 75%, 100% and actual motion aperture respectively, is at least measured the valve under each aperture
5 discharge coefficients.
11. impurity environment lower valve discharge characteristic identification method according to claim 9, which is characterized in that further packet
It includes：Under the actual motion aperture, obstruction stream is carried out respectively and flows condition test with non-obstruction.
12. impurity environment lower valve discharge characteristic identification method according to claim 10, which is characterized in that by external
Under the action of the adjusting of test loop pump so that occur at least 2 when carrying out the Comparability test in the test loop
Secondary stricture stream operating mode.
13. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that the step 4
The impurity experiment valve opening be set as actual motion aperture.
14. impurity environment lower valve discharge characteristic identification method according to claim 13, which is characterized in that the impurity
Sampling frequency during experiment is small at interval of 1 later to be primary at interval of sampling in 0.5 hour in 2 hours after on-test
When sampling it is primary, sampling number must be more than 20 times.
15. impurity environment lower valve discharge characteristic identification method according to claim 14, which is characterized in that the impurity
It must tend to be constant until obtaining stable discharge coefficient by the flow of the valve and front and back pressure difference during experiment, otherwise will
Extend the impurity test period.
16. impurity environment lower valve discharge characteristic identification method according to claim 1, which is characterized in that utilization is not true
The method of qualitative analysis calculates the obstruction stream and the discharge coefficient synthesis of the valve under non-obstruction stream mode is uncertain
Degree.
17. impurity environment lower valve discharge characteristic identification method according to claim 16, which is characterized in that the examination
Standard is：It chooses uncertainty of measurement fiducial probability to be analyzed as error range for 95%, being averaged under impurity operating mode
Measurement of the average flow coefficient deviation in fiducial probability section under discharge coefficient and In water under same operating status be not true
Surely error range is spent, that is, meets formula：
Indicate that the valve meets design requirement in the impurity operating mode operation characteristic, wherein U is that discharge coefficient synthesis is uncertain
Degree.
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| CN114235386A (en) * | 2022-02-28 | 2022-03-25 | 艾肯（江苏）工业技术有限公司 | Test platform for verifying static pressure life of stop valve through fluid detection |
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