CN110516363A - A method of for determining Turbine Performance Test duration - Google Patents
A method of for determining Turbine Performance Test duration Download PDFInfo
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- CN110516363A CN110516363A CN201910803574.5A CN201910803574A CN110516363A CN 110516363 A CN110516363 A CN 110516363A CN 201910803574 A CN201910803574 A CN 201910803574A CN 110516363 A CN110516363 A CN 110516363A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
- F01D21/00—Shutting-down of machines or engines, e.g. in emergency; Regulating, controlling, or safety means not otherwise provided for
- F01D21/003—Arrangements for testing or measuring
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/14—Testing gas-turbine engines or jet-propulsion engines
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- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Control Of Turbines (AREA)
Abstract
The invention discloses a kind of methods for determining Turbine Performance Test duration, which comprises the following steps: 1) obtains the maximum allowable range of readings Δ I of each major parameter in Turbine Performance TestAllow；2) the range of readings Δ I of sample is calculateda=Imax‑Imin, as Δ Ia< Δ IAllowWhen, then valid reading number is Na, by NaCha Tu get ωa, then each major parameter reading fluctuation range to the impact factor Z of test resulta；Otherwise, then measuring instrumentss precision or Adjustment Tests scheme are improved；3) least count times N required for testing is calculatedRWith test duration TR=fNR；4) when the valid reading times N of each major parameteraAll greater than least count times N needed for being equal to testRWhen, then termination test, otherwise, then repeatedly step 2) and step 3), by least count number required for final test and test duration, this method being capable of accurately least count number and test duration required for Turbine Performance Test.
Description
Technical field
The invention belongs to steam turbine technology fields, are related to a kind of method for determining Turbine Performance Test duration.
Background technique
Recommend in Turbine Performance Test regulation (ASME PTC6-2004): each load point performance test duration extremely
It should continue 2 hours less, with the isolated instances of checking system, the examination that domestic Turbine Performance Test is largely recommended with this at present
A length of standard when testing.It is very high to constancy of test condition requirement since the single test time is longer, increase test difficulty.
With the continuous adjustment of China's electric structure, the installed capacity of the new energy electric powers such as wind-powered electricity generation, photovoltaic, water power is continuously and healthily
Growth, the uncertainty and randomness of generation of electricity by new energy power output bring huge to the safe operation and power supply guarantee of network system
Challenge.In order to dissolve new energy, fired power generating unit inevitably becomes peak regulation main force unit, quick load change and depth peak regulation
Become the new normality of fired power generating unit, so as to cause currently when carrying out steam turbine of thermal power plant performance test, it is difficult to application to compared with
Long stability load often is forced to stop in the acquisition duration that test is not up to recommended, and testing crew needs to be detained for a long time
Load is waited, it is very long when causing Turbine Performance Test, waste many manpowers and time；Meanwhile Turbine Performance Test at present
Lack the criterion to test validity in progress, need to just can be carried out judgement according to test result after the completion of test, increase vapour
The invalid risk of turbine performance test.
Therefore, a kind of method for fast and accurately carrying out Turbine Performance Test is found, is held to solve Present Thermal Power unit
Carry on a shoulder pole the heavy burden of quick load change and depth peak regulation, it has also become extremely urgent problem, it is receive more and more attention.
Summary of the invention
It is an object of the invention to overcome the above-mentioned prior art, provide a kind of for determining that steam turbine performance tries
The method for testing duration, this method being capable of accurate least count numbers required for Turbine Performance Test and when test
It is long, to improve the accuracy and efficiency of Turbine Performance Test.
In order to achieve the above objectives, the method for the present invention for determining Turbine Performance Test duration includes following step
It is rapid:
1) the maximum allowable range of readings Δ I of each major parameter in Turbine Performance Test is obtainedAllow；
2) Turbine Performance Test existing sample number N in the process is seta(I1, I2..., Ia), obtain the reading of sample
Number range delta Ia=Imax-Imin, as Δ IaLess than Δ IAllowWhen, then valid reading number is Na, by NaCha Tu get ωa, wherein ωa
For the ratio for reading standard deviation and range of readings, ωaFor characterize sample reading dispersion degree, then each main ginseng
Impact factor Z of the number reading fluctuation range to test resulta；As Δ IaLess than Δ IAllowWhen, it is invalid to show to exist in sample
Reading, then improve measuring instrumentss precision or Adjustment Tests scheme；
3) ω according to obtained in step 2)aAnd Za, calculate least count number required for testing
With test duration TR=fNR；
4) when the valid reading times N of each major parameteraAll greater than least count times N needed for being equal to testRWhen,
Then termination test, otherwise, then repeatedly step 2) and step 3), until the valid reading number of each major parameter is all larger than test institute
The least count times N neededRUntil, least count number required for test finally and test duration are obtained, it then will be final
Test required for least count number and test duration respectively as least count required for Turbine Performance Test time
Number and test duration.
The concrete operations of step 1) are as follows:
11) estimation test duration T is calculated according to the test duration T and test reading time interval f estimated and is completed test institute
Total indicator reading times N=the T/f+1 needed；
12) ω is set as the ratio of standard deviation and range of readings, by the functional relation ω of ω and the fitting of total indicator reading times N
=f (N) calculates the corresponding ω value of test total indicator reading times N；
13) each major parameter reading fluctuation range is calculated to test according to test total indicator reading times N and its corresponding ω value
As a result impact factorIf instrument number used in same data type is n, then the reading wave of single instrument
Impact factor of the dynamic range to test result
14) thermal loss of steam turbine rate is calculated to the sensitivity coefficient of each primary operating parameter by Turbine Performance Test regulation
θ1、θ2, obtain the reading desired value E of each major parameterφ；
15) Z obtained according to step 13) and step 14)i、θ1、θ2And EφIt is worth, each major parameter in calculated performance test
Maximum allowable range of readings Δ IAllow=Zi·Eφ/(100θ1)=Zi/θ2。
Impact factor Z of each major parameter reading fluctuation range to test result in step 2)a=100 θ1·ΔIa/[0.5
(Imax+Imin)]=θ2·ΔIa。
The invention has the following advantages:
Method of the present invention for determining Turbine Performance Test duration is when specific operation, and elder generation is in steam turbine
The maximum allowable range of readings of each major parameter in Turbine Performance Test is calculated before capable of testing, then in performance test process
In, iterative cycles calculating is carried out by having the reading fluctuation range of sample and valid reading number, obtains meeting performance
The requirement of least count number required for testing, i.e., it is secondary all greater than least count is equal to when each major parameter valid reading number
Number when, can termination performance test, obtain least count number required for Turbine Performance Test and test duration, to improve vapour
The accuracy and efficiency of turbine performance test.
Detailed description of the invention
Fig. 1 is the change curve of least count number and sample number in Turbine Performance Test；
Fig. 2 is the graph of relation of ω and sample number N in the present invention；
Fig. 3 is flow chart of the invention.
Specific embodiment
The invention will be described in further detail with reference to the accompanying drawing:
With reference to Fig. 3, it is of the present invention for determine Turbine Performance Test duration method the following steps are included:
1) the test duration T for estimating Turbine Performance Test, according to the test duration T and test reading time interval estimated
F, which is calculated, completes to test required total indicator reading times N=T/f+1；
2) ω is set as the ratio of standard deviation and range of readings, by the functional relation ω of ω and the fitting of total indicator reading times N
=f (N) calculates the corresponding ω value of test total indicator reading times N；
3) each major parameter reading fluctuation range is calculated according to test total indicator reading times N and its corresponding ω value to tie test
The impact factor of fruitIf instrument number used in same data type is n, then the reading fluctuation of single instrument
Impact factor of the range to test result
4) thermal loss of steam turbine rate is calculated to the sensitivity coefficient θ of each primary operating parameter by Turbine Performance Test regulation1、
θ2, obtain the reading desired value E of each major parameterφ；
5) Z obtained according to step 3) and step 4)i、θ1、θ2And EφValue, calculated performance test in each major parameter most
It is big to allow range of readings Δ IAllow=Zi·Eφ/(100θ1)=Zi/θ2；
6) assume have sample number N during Turbine Performance Testa(I1, I2..., Ia), obtain sample
Range of readings Δ Ia=Imax-Imin, as Δ IaLess than Δ IAllowWhen, then valid reading number is Na, by NaCha Tu get ωa, wherein
ωaFor the ratio for reading standard deviation and range of readings, ωaFor characterize sample reading dispersion degree, then it is each mainly
Impact factor Z of the parameter readings fluctuation range to test resulta=100 θ1·ΔIa/[0.5(Imax+Imin)]=θ2·ΔIa；When
ΔIaLess than Δ IAllowWhen, show that there are invalid readings in sample, then improves measuring instrumentss precision or Adjustment Tests scheme；
7) ω according to obtained in step 6)aAnd Za, calculate least count number required for testing
With test duration TR=fNR；
8) the test valid reading times N being calculated by step 6) and 7)aAnd least count times N needed for testR,
When the valid reading times N of each major parameteraAll greater than least count times N needed for being equal to testRWhen, then termination test,
Otherwise, then repeatedly step 6) and step 7), the minimum needed for the valid reading number of each major parameter is all larger than test are read
Number times NRUntil, least count number required for test finally and test duration are obtained, it then will be needed for final test
When the least count number and test duration wanted are respectively as least count number required for Turbine Performance Test and test
It is long.
Embodiment one
Turbine Performance Test part initial data is as shown in table 1 after certain power plant's overhaul, tests total duration 1h, sample frequency
For 20s.
Table 1
According to performance test data after power plant's overhaul, by taking the calculating process of electrical power least count number as an example, to this
The calculating process of invention is further described in detail:
One, before on-test, the maximum allowable range of readings of each major parameter is estimated
1) it sets the time T=1h for completing performance test, tests sampling time interval f=20s, then it is total required for test to read
N=T/f+1=181 is counted for several times；
2) ω is fitted according to least square method and reads the relational expression of times N, wherein ω is standard deviation and range of readings
Ratio:
As 2 < N≤10:
ω=0.00003750N6-0.00153750N5+0.02582532N4-0.22816565N3+1.12527354N2-
2.98776655N+3.83300000
As 10 < N≤50:
ω=- 0.00000275N3+0.00032000N2-0.01317500N+0.42250000
As 50 < N≤200:
ω=(- 0.02885390) ln (N)+0.33287712
As N > 200, ω=0.18.
It can thus be concluded that: as N=181, calculate to obtain ω=0.18288；
3) according to step 1) and step 2), it is known that power instrument number n=1 calculates single power meter reading fluctuation model
It encloses to test result impact factor Zi=1.8391, wherein
Wherein, N is estimated test total indicator reading number, and ω is the function of N, and ω is equal to the ratio of standard deviation and range of readings
Value, n are instrument number used in same reading type；
4) as shown in Table 1, under the operating condition of test power desired value Eφ=570MW, by following formula calculate test in power
Maximum allowable range of readings Δ IAllow=10.5MW, wherein other each maximum allowable range of readings of major parameter are shown in Table 3；
Wherein, EφDesired value, θ are read for each major parameter1、θ2For sensitivity coefficient, wherein power, flow measuring point take
θ1；Temperature, pressure-measuring-point θ2；θ1、θ2Value is shown in Table 2；
Table 2
Table 3
Two, during testing, least count number needed for estimating each major parameter
1) according to valid reading times N existing in testa, estimate each major parameter reading fluctuation range to test result
Impact factor Za, wherein
If performance test has carried out 160s, 8 power sample datas are obtained by table 1, it can thus be concluded that the reading wave of sampled data
Dynamic range delta Ia=Imax-Imin=1.82MW, due to the reading fluctuation range Δ I of sampled dataaLess than the maximum allowable reading of power
Range delta IAllow, then the valid reading times N of sampled dataa=8, it can thus be concluded that impact factor Za=0.32；
2) estimate least count number required for powerThat is Na=8, ωa=0.3577, obtain function
Rate is in valid reading times NaLeast count times N needed for corresponding completion performance test when=8R=21；
3) by valid reading times NaLess than the least count times N for completing performance test needsR, test and continue under reading
One data I9, repeat the above steps, until Na+i≥NR, i.e., existing valid reading times N during performance testaGreater than etc.
In the least count times N of estimationR, at this time test result random uncertainty caused by the reading dispersion degree of power be no more than ±
0.05%；
4) feedwater flow differential pressure, main steam pressure, main steam temperature, reheat steam temperature similarly, are further calculated by table 1
The least count number Deng required for, when the valid reading number of each major parameter is all greater than equal to its least count number
When, it can termination performance test；
Then the calculated result of each major parameter least count number is each main during test referring to table 3 under the operating condition
The variation of parameter least count number is referring to Fig. 1.As shown in Figure 1: Turbine Performance Test duration TR=NRF=90 × 20=
1800s, show test can be terminated after 45min, compared to Turbine Performance Test regulation recommend 2 hours stable state durations,
The present invention significantly shortens performance test duration by effective Control experiment result random uncertainty；Meanwhile power and water supply
Flow least count number convergence rate is slow, and the least count number needed is most, shows in performance test power and to water flow
It is big to measure sampled data fluctuation, therefore the stability of power and feedwater flow is the key that performance test could be rapidly completed.
Table 3
In conclusion major significance of the invention is under the conditions of existing performance test, by power, flow, pressure
The real-time circulation of the key measuring point least count number such as power and temperature calculates, determination steam turbine performance examination accurate, rationally, scientific
Duration is tested, the providing Turbine Performance Test duration at 2 hours of blindness is avoided.The present invention is small in test major parameter fluctuation
When, test result random uncertainty can be effectively controlled, substantially reduce test reading number, so as to shorten the performance test time；
When test major parameter fluctuation is big, can determine whether test reading is effective, if need to improve measuring instrumentss precision or adjustment
Testing program not only effectively alleviates and tests the problem of time-consuming in Turbine Performance Test, also to Turbine Performance Test
Validity provide real-time criterion, to Turbine Performance Test it is smooth development have important engineering application value, pass through
Domestic and international related patents are retrieved and are analyzed, applicant does not have found and technical solution similar in feature of present invention.
Claims (3)
1. a kind of method for determining Turbine Performance Test duration, which comprises the following steps:
1) the maximum allowable range of readings Δ I of each major parameter in Turbine Performance Test is obtainedAllow；
2) Turbine Performance Test existing sample number N in the process is seta(I1, I2..., Ia), obtain the reading model of sample
Enclose Δ Ia=Imax-Imin, as Δ IaLess than Δ IAllowWhen, then valid reading number is Na, by NaCha Tu get ωa, wherein ωaTo read
The ratio of number standard deviation and range of readings, ωaFor characterizing the dispersion degree of sample reading, then the reading of each major parameter
Impact factor Z of the number fluctuation range to test resulta；As Δ IaLess than Δ IAllowWhen, show in sample there are invalid readings,
Then improve measuring instrumentss precision or Adjustment Tests scheme；
3) ω according to obtained in step 2)aAnd Za, calculate least count number required for testingWith
Test duration TR=fNR；
4) when the valid reading times N of each major parameteraAll greater than least count times N needed for being equal to testRWhen, then eventually
Only test, otherwise, then repeatedly step 2) and step 3), until the valid reading number of each major parameter is all larger than needed for test
Least count times NRUntil, least count number required for test finally and test duration are obtained, then by final examination
Least count number required for testing and test duration respectively as least count number required for Turbine Performance Test and
Test duration.
2. the method according to claim 1 for determining Turbine Performance Test duration, which is characterized in that step 1)
Concrete operations are as follows:
11) estimation test duration T is calculated according to the test duration T and test reading time interval f estimated required for completing test
Total indicator reading times N=T/f+1；
12) ω is set as the ratio of standard deviation and range of readings, by functional relation ω=f of ω and the fitting of total indicator reading times N
(N), the corresponding ω value of test total indicator reading times N is calculated；
13) each major parameter reading fluctuation range is calculated to test result according to test total indicator reading times N and its corresponding ω value
Impact factorIf instrument number used in same data type is n, then the reading of single instrument fluctuates model
Enclose the impact factor to test result
14) thermal loss of steam turbine rate is calculated to the sensitivity coefficient θ of each primary operating parameter by Turbine Performance Test regulation1、θ2,
Obtain the reading desired value E of each major parameterφ；
15) Z obtained according to step 13) and step 14)i、θ1、θ2And EφIt is worth, the maximum of each major parameter in calculated performance test
Allow range of readings Δ IAllow=Zi·Eφ/(100θ1)=Zi/θ2。
3. the method according to claim 1 for determining Turbine Performance Test duration, which is characterized in that in step 2)
Impact factor Z of each major parameter reading fluctuation range to test resulta=100 θ1·ΔIa/[0.5(Imax+Imin)]=θ2·
ΔIa。
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