CN110080833A - A kind of appraisal procedure for the high pitch fm capacity of steam turbine improving peak load regulation - Google Patents
A kind of appraisal procedure for the high pitch fm capacity of steam turbine improving peak load regulation Download PDFInfo
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- CN110080833A CN110080833A CN201810387795.4A CN201810387795A CN110080833A CN 110080833 A CN110080833 A CN 110080833A CN 201810387795 A CN201810387795 A CN 201810387795A CN 110080833 A CN110080833 A CN 110080833A
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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
- F01D17/00—Regulating or controlling by varying flow
- F01D17/10—Final actuators
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Abstract
The present invention discloses a kind of appraisal procedure of high pitch fm capacity of steam turbine for improving peak load regulation, the DCS data including acquiring downstream pressure of the valve opening of each high pitch of unit from 0 to standard-sized sheet when；Calculate steam flow of each high pitch in different valve openings；According to the steam flow of the valve opening of each high pitch of unit and each high pitch calculated in different valve openings, draw valve opening and steam flow relation curve, the relation curve drawn matches with factory design relation curve, the data of any two adjacent moment, which make the difference, from the DCS data of downstream pressure collected obtains absolute difference, judgement | Δ P | value whether in section [0, Δ Pmax] in, as | Δ P | value when exceeding the section, determine that there are hardware faults for high pitch.Unit load is mutated the present invention is based on pressure monitoring after lofty tone gate valve and carries out fault pre-alarming, realizes that the high pitch fm capacity of steam turbine is assessed in real time, improves peak load regulation performance.
Description
Technical field
The present invention relates to the dispatching of power netwoks communications field, in particular to a kind of high pitch frequency modulation of steam turbine for improving peak load regulation
The appraisal procedure of ability.
Background technique
Currently, country supports to develop new energy energetically, for the supply for keeping New-energy power system reliable and stable, increasingly
Much power fired power generating units (or even thermal power plant unit) give power grid band by participating in the quick peak regulation of depth to stabilize the new energy such as wind-powered electricity generation
The unstability come.Many large-scale thermal power machine group steam turbines are often born when putting into AGC operational mode and participating in peak regulation
Lotus mutation failure seriously affects the safe and highly efficient operation of unit.In general, cause steam turbine in practice that sudden load change occurs
There are many factor of failure, from the point of view of the documents and materials published, are particularly due to high voltage adjusting valve (general referred to as " lofty tone
Door ", with symbol " GV " indicate) software and hardware in terms of problem cause steam turbine occurs under sequential valve operation mode load dash forward
The case of accident barrier is most.Go out since high pitch discharge characteristic design curve mismatches the unit that will lead to actual flow characteristic
Existing sudden load change failure, this kind belong to the software fault of high pitch, are most common a kind of failures most common at present；In addition,
The high pitch meeting frequent movement of Load Regulation is participated in, therefore the reliability of its drive connection part faces a severe test, hardware abrasion
Increasing causes failure rate to increase.When there are will lead to steam turbine when hardware connecting fault to issue in sequential valve operation mode for high pitch
The problem of raw sudden load change, oscillation etc. influence unit frequency modulation function.This belongs to pitch hardware fault, and the frequency of occurrences is only second to soft
Part failure.In order to solve this kind of failure, many researchers are to the sudden load change failure mechanism caused due to high pitch problem
It illustrates, and proposes some effective solutions.For example, devising discharge characteristic in terms of software fault
On-line monitoring system is used for the deviation pre-alert of high pitch rating curve, in hardware aspect, it was also proposed that is opened based on high pitch
The efficient diagnosis method of test is closed, testing and diagnosing quickly can be carried out to failure, effectively judge out of order classification and reason.These
Measure all achieves good effect in practice.However, there are also certain for the hardware fault diagnosis method of high pitch at present
Limitation, existing measure is all to make analytical judgment to failure cause again after the failure occurred, for practical intelligent institute, power plant
The fault pre-alarming and unit fm capacity evaluation problem, this method needed there is timeliness defect, cannot occur in failure or be
Early warning will be provided when occurring, fault cues also can not be just provided when unit is in peak regulation mode, is improving unit fm capacity
Effect caused by aspect is not too obvious.It goes to verify in addition, these measures are also required to special test, needs to occupy unit
Runing time, and test data need technical professional's analysis handle, this can also expend for quite a long time.Cause
This, timely and effectively high pitch fm capacity appraisal procedure improves unit safety operation performance etc. to unit frequency modulation performance is promoted
It makes great sense.
Existing high pitch fault diagnosis means are to carry out Accurate Analysis, critical data parameter packet by acquisition DCS data
Include pressure, high row pressure power, Stream temperature degree, height after high pitch aperture, the power of the assembling unit, integrated flow rate instruction, main vapour pressure, governing stage
Temperature, #1~#3 watts of temperature and vibration X/Y and EH oil pressure etc. after row's temperature, governing stage.Finally, based on not stay gale formula into
Row actual flow (%) calculates to determine whether there are failures.These parameters can reflect lofty tone valve hair operating status, but press
A crucial characterization parameter of the power as valve, the pressure-measuring-point of valve has before there was only valve at present, and does not have after valve, therefore, can
To improve the status monitoring of valve by increasing downstream pressure measuring point；Also, when valve internal structure member has abnormal, before valve
Pressure is basically unchanged, but downstream pressure is that meeting is changed.So coming from the interior flow field basic principle of valve
It sees, increasing downstream pressure measuring point is a kind of feasible pattern that pitch fm capacity is assessed in real time.
Under normal circumstances, the relationship between lofty tone door valve opening and steam flow is as shown in Figure 1, representated by the curve 1
Section in, valve opening is relatively small, is had almost no change by the steam flow of valve, in this segment after lofty tone gate valve
Pressure change is little, and the downstream pressure difference variation between adjacent moment also can be ignored, but downstream pressure before lofty tone gate valve
Difference is maximum state of value.In the section shown in curve 2, valve opening is in a linear relationship with steam flow.At this point, steam
Flow increases with the increase of valve opening, and lofty tone door downstream pressure constantly reduces, the downstream pressure difference between adjacent moment
In maximum state of value, downstream pressure is gradually become smaller before lofty tone gate valve.As valve opening further increases, valve opening and steaming
A kind of non-linear relation is presented between steam flow amount, as curve 3 illustrates.In the section, steam flow becomes with the increase of aperture
Change gradually slows down, and downstream pressure difference becomes smaller trend decrease before lofty tone gate valve, and the downstream pressure difference between adjacent moment reduces.?
In segment representated by curve 4, steam flow no longer changes with valve opening and is changed, and pressure difference is close after and before the valve for lofty tone door
0, the downstream pressure difference between adjacent moment is also close to 0.When hardware fault occurs for high pitch, such as the valve stem nut of high pitch
Abrasion, which occurs, in connecting component causes valve head connecting component the failures such as tripping loosening (or even falling off) occur, and valve rod is risen by given instruction
Drop, but valve head can generate lofty tone door opening jumping phenomenon under the action of the air-flow power and valve head self gravity that steam pressure generates
(as shown in Figure 2), and then unit load is caused to be mutated, pressure difference value can be greater than it just after the lofty tone gate valve between valve rod adjacent moment
Often maximum value when operation.According to this technical principle, lofty tone valve hardware fault warning function may be implemented.
Summary of the invention
The main object of the present invention is to propose a kind of assessment side of high pitch fm capacity of steam turbine for improving peak load regulation
Method, it is intended to overcome problem above.
To achieve the above object, a kind of high pitch fm capacity of steam turbine improving peak load regulation proposed by the present invention
Appraisal procedure, include the following steps:
S10 acquires the valve opening of each high pitch of unit from 0 to standard-sized sheet in the case where unit is in normal load operating region
When downstream pressure DCS data；
S20 is arranged unit and operates normally, and calculates steam flow of each high pitch in different valve openings；
Steam of the S30 according to the valve opening and each high pitch calculated of each high pitch of unit in different valve openings
Flow draws valve opening and steam flow relation curve, and the relation curve drawn matches with factory design relation curve,
If matching, enter in next step；
S40 data of any two adjacent moment from the DCS data of downstream pressure collected, which make the difference, show that difference is absolute
Value selects maximum difference absolute value to be defined as Δ P ' from resulting absolute differencemax, the Δ P ' of selectionmaxMultiplied by COEFFICIENT K, K
> 1, obtain maximum value Δ Pmax,, i.e.,
ΔPmax=K Δ P 'max(MPa), the minimum value that downstream pressure absolute difference can be got between adjacent moment is 0,
The value interval for obtaining downstream pressure absolute difference is [0, Δ Pmax], i.e.,；
| Δ P |=| Pn+1-Pn| (MPa)；
S50 sets the downstream pressure data of unit at a time Tn acquisition as Pn, the valve acquired in subsequent time Tn+1
Pressure data is Pn+1 afterwards, then the absolute value of the pressure variety within this time are as follows:
| Δ P |=| Pn+1-Pn| (MPa) (2),
Judgement | Δ P | value whether in section [0, Δ Pmax], as | Δ P | value when exceeding the section, determine to a high-profile
There are hardware faults for door.
Preferably, the S30 includes:
S301 is in the case where unit is in load operating region, according to the operation operating instruction of unit, by the method for operation by sequence
Unit load is risen to 95% on this basis to single valve by Vavle switching；
S302 releases unit cooperative control and automatic sliding pressure operation control, on the basis for keeping unit load to be basically unchanged
On, reduce the main steam pressure of unit and increase the comprehensive valve bit instruction of unit simultaneously, the high pitch of unit is made to reach standard-sized sheet
State is determined as software fault reason or hardware fault reason according to whether there is sudden load change phenomenon during this；
S303 is tried with the two valve standard-sized sheets and three valve standard-sized sheets that diagonally into vapour for two valve point steam admission modes, carry out at least two groups respectively
It tests, according to whether occurring sudden load change phenomenon during this, verifies failure cause determined by S202；
S304 is acquired and is carried out configuration and continuous recording data in DCS, is divided within 1s between acquisition time, is passed through Fu Liuge
You utilize above-mentioned related data collected by formula, and the discharge characteristic for carrying out high pitch calculates, and obtain hardware fault feature, judgement
Valve hardware failure and severity, the Fu Liugeer formula are；
Wherein, G is metered flow；G' is variable working condition flow；p1For specified main steam pressure；p2For pressure after governing stage；
p1' be variable working condition when main vapour pressure；p2' be variable working condition when governing stage after pressure；t1For specified main steam temperature；t1' it is to exchange work
Main steam temperature when condition；
S305 draws high pitch actual flow and valve opening relation curve according to the actual flow being calculated, and is drawn
Relation curve with factory design relation curve match, if matching, enter in next step.
Preferably, the S30 further include:
If S306 is not matched that, to a high-profile according to the gap adjustment of the relation curve and factory design relation curve drawn
Gate valve bar lifting travel.
The present invention causes unit load mutation and then influence unit to solve the high pitch hardware fault of existing Steam Turbine
The problem of peaking performance, and propose a kind of be mutated based on pressure monitoring after lofty tone gate valve to unit load and carry out fault pre-alarming,
To realize that the high pitch fm capacity of steam turbine is assessed in real time, improve peak load regulation performance.
Detailed description of the invention
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 technical 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
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the flow diagram of method of the invention；
Fig. 2 is high pitch rating curve；
Fig. 3 is the arrangement of nozzles figure of unit in embodiment；
Fig. 4 is load mutation failure mechanism schematic diagram；
Fig. 5 is that the load first time load hardover failure out of control that unit GV2 switching process occurs in embodiment shows power
The time-domain diagram of variation；
Fig. 6 is that load second of load hardover failure out of control that unit GV2 switching process occurs in embodiment shows power
The time-domain diagram of variation；
Fig. 7 is the characteristic curve for the high pitch that unit breaks down；
Fig. 8 is downstream pressure time-domain diagram when unit pitch 25% is without Flow Fault in embodiment；
Fig. 9 is downstream pressure time-domain diagram when unit pitch 15% is without Flow Fault in embodiment；
Figure 10 (1) is that axis figure --- there are wear-out failures for practical high pitch coupling part promotion in embodiment；
Figure 10 (2) is practical high pitch coupling part big nut figure in embodiment；
Figure 10 (3) is the realization of practical high pitch coupling part connector sleeve figure the object of the invention, functional characteristics in embodiment
And the embodiments will be further described with reference to the accompanying drawings for advantage.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.Base
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts it is all its
His embodiment, shall fall within the protection scope of the present invention.
It is to be appreciated that if relating to directionality instruction (such as up, down, left, right, before and after ...) in the embodiment of the present invention,
Then directionality instruction be only used for explain under a certain particular pose (as shown in the picture) between each component relative positional relationship,
Motion conditions etc., if the particular pose changes, directionality instruction is also correspondingly changed correspondingly.
In addition, being somebody's turn to do " first ", " second " etc. if relating to the description of " first ", " second " etc. in the embodiment of the present invention
Description be used for description purposes only, be not understood to indicate or imply its relative importance or implicitly indicate indicated skill
The quantity of art feature." first " is defined as a result, the feature of " second " can explicitly or implicitly include at least one spy
Sign.It in addition, the technical solution between each embodiment can be combined with each other, but must be with those of ordinary skill in the art's energy
It is enough realize based on, will be understood that the knot of this technical solution when conflicting or cannot achieve when occurs in the combination of technical solution
Conjunction is not present, also not the present invention claims protection scope within.
As Figure 1-10 shows, a kind of steam turbine high pitch fm capacity improving peak load regulation proposed by the present invention
Appraisal procedure includes the following steps:
S10 acquires the valve opening of each high pitch of unit from 0 to standard-sized sheet in the case where unit is in normal load operating region
When downstream pressure DCS data；
S20 is arranged unit and operates normally, and calculates steam flow of each high pitch in different valve openings；
Steam of the S30 according to the valve opening and each high pitch calculated of each high pitch of unit in different valve openings
Flow draws valve opening and steam flow relation curve, and the relation curve drawn matches with factory design relation curve,
If matching, enter in next step；
S40 data of any two adjacent moment from the DCS data of downstream pressure collected, which make the difference, show that difference is absolute
Value selects maximum difference absolute value to be defined as Δ P ' from resulting absolute differencemax, the Δ P ' of selectionmaxMultiplied by COEFFICIENT K, K
> 1, obtain maximum value Δ Pmax,, i.e.,
ΔPmax=K Δ P 'max(MPa), the minimum value that downstream pressure absolute difference can be got between adjacent moment is 0,
The value interval for obtaining downstream pressure absolute difference is [0, Δ Pmax], i.e.,；
| Δ P |=| Pn+1-Pn| (MPa)；
S50 sets the downstream pressure data of unit at a time Tn acquisition as Pn, the valve acquired in subsequent time Tn+1
Pressure data is Pn+1 afterwards, then the absolute value of the pressure variety within this time are as follows:
| Δ P |=| Pn+1-Pn| (MPa) (2),
Judgement | Δ P | value whether in section [0, Δ Pmax], as | Δ P | value when exceeding the section, determine to a high-profile
There are hardware faults for door.
Preferably, the S30 includes:
S301 is in the case where unit is in load operating region, according to the operation operating instruction of unit, by the method for operation by sequence
Unit load is risen to 95% on this basis to single valve by Vavle switching；
S302 releases unit cooperative control and automatic sliding pressure operation control, on the basis for keeping unit load to be basically unchanged
On, reduce the main steam pressure of unit and increase the comprehensive valve bit instruction of unit simultaneously, the high pitch of unit is made to reach standard-sized sheet
State is determined as software fault reason or hardware fault reason according to whether there is sudden load change phenomenon during this；
S303 is tried with the two valve standard-sized sheets and three valve standard-sized sheets that diagonally into vapour for two valve point steam admission modes, carry out at least two groups respectively
It tests, according to whether occurring sudden load change phenomenon during this, verifies failure cause determined by S202；
S304 is acquired and is carried out configuration and continuous recording data in DCS, is divided within 1s between acquisition time, is passed through Fu Liuge
You utilize above-mentioned related data collected by formula, and the discharge characteristic for carrying out high pitch calculates, and obtain hardware fault feature, judgement
Valve hardware failure and severity, the Fu Liugeer formula are；
Wherein, G is metered flow；G' is variable working condition flow；p1For specified main steam pressure；p2For pressure after governing stage；p1
' main vapour pressure when for variable working condition；p2' be variable working condition when governing stage after pressure；t1For specified main steam temperature；t1' it is variable working condition
When main steam temperature；
S305 draws high pitch actual flow and valve opening relation curve according to the actual flow being calculated, and is drawn
Relation curve with factory design relation curve match, if matching, enter in next step.
Preferably, the S30 further include:
If S306 is not matched that, to a high-profile according to the gap adjustment of the relation curve and factory design relation curve drawn
Gate valve bar lifting travel.
Turbine sequence valve sudden load change method for diagnosing faults practical operation based on the test of lofty tone door switch of the invention is as follows:
One: in the case where unit is in normal load operating region, when acquisition each lofty tone door valve opening of unit is from 0 to standard-sized sheet
Downstream pressure DCS data.Traditional unit thus needs to increase pressure-measuring-point there is no pressure-measuring-point after lofty tone gate valve
Mode obtain lofty tone door downstream pressure；
Two: operating normally and be arranged according to unit, acquisition valid data calculate steaming of each high pitch in different valve openings
The data such as steam flow amount draw valve opening and steam flow relation curve, check it is practical draw curve whether with design curve one
It causes.If consistent, carried out by step 3, it is inconsistent, it needs according to actual needs to do into one lofty tone gate valve bar lifting travel
Step design modification；Specific steps are as follows:
(1): in the case where unit is in load operating region, according to the operation operating instruction of unit, by the method for operation by sequence
Unit load is risen to 95% or so on this basis to single valve by Vavle switching；
(2): unit cooperative control and automatic sliding pressure operation control are released, on the basis for keeping unit load to be basically unchanged
On, by reducing the main steam pressure of unit manually and increasing the comprehensive valve bit instruction of unit simultaneously, make 4 high pitch of unit
Reach the state of standard-sized sheet；Whether occur sudden load change phenomenon in the process by test, can determine that failure cause is in software side
Face or hardware aspect；
(3): on the basis of testing above, 4 lofty tone gate-modes being changed to manually adjust, realization can be single manually
Solely adjust the aperture of each high pitch；Then, respectively to carry out no less than two groups diagonally into vapour for two valve point steam admission modes
Two valve standard-sized sheets and the test of three valve standard-sized sheets；Whether occur sudden load change phenomenon in the process by test, it can further verification step
The determination of two or two pairs of failure causes；
(4): being calculated according to Fu Liugeer formula using the discharge characteristic that test data carries out high pitch, further extracted
To fault signature, valve hardware failure and severity are judged,
In addition, acquiring carry out configuration and continuous recording above-mentioned test in DCS after the test to carry out Accurate Analysis
Process data is divided within 1s between acquisition time；Then relevant calculation and analysis are carried out.Data acquisition parameters include that high pitch is opened
Spend (GV1~GV4), power, main valve bit instruction, vapour pressure and steam temperature (steam, high row's steam after main steam, governing stage), No. 1~3
Number watt watt mild axis vibration, EH oil pressure and back pressure.Also, since gale formula of not staying down is reflected in varying duty group pressure and grade
The relationship of group flow, i.e. actual flow (%)；Therefore, the unlatching of the flow rate calculation principle and formula of steam turbine to high pitch is selected
The parameter of process carries out discharge relation calculating.The citation form of its formula are as follows:
Wherein, G is metered flow；G' is variable working condition flow；p1For specified main steam pressure；p2For pressure after governing stage；
p1' be variable working condition when main vapour pressure；p2' be variable working condition when governing stage after pressure；t1For specified main steam temperature；t1' it is to exchange work
Main steam temperature when condition.
(5): high pitch actual flow and valve opening relation curve being drawn according to the actual flow being calculated, and checked
Whether there is deviation between curve and design curve, if there is situation as shown in Figure 6, it is possible to determine that high pitch there are failure,
It needs to overhaul high pitch again；
Three: as it was noted above, the change value of pressure in the aperture variation range representated by Fig. 1 curve 2 between adjacent moment
It is maximum.Pressure data, the data of any two adjacent moment make the difference, must go on business after lofty tone gate valve collected in processing step one
Value.Select maximum value therein and the Δ P ' that takes absolute value to obtainmax.To avoid because excessive pre-alarm is wrong caused by the value of selection is too small
Accidentally, the maximum value of selection will have certain surplus, here multiplied by COEFFICIENT K (K > 1), obtain maximum value:
ΔPmax=K Δ P 'max(MPa)
The minimum value that downstream pressure absolute difference can be got between adjacent moment is 0.Therefore it is pressed after obtaining valve
The value interval of power absolute difference is [0, Δ Pmax]；| Δ P |=| Pn+1-Pn|(MPa)
Four: setting unit at a time TnThe downstream pressure data of acquisition are Pn, in subsequent time Tn+1When the valve that acquires after
Pressure data is Pn+1, the absolute value of the pressure variety within this time are as follows:
Five: judgement | Δ P | value whether in section [0, Δ Pmax], as | Δ P | value when exceeding section, it is possible to determine that
There are hardware faults for high pitch.
The phenomenon that unit of practical operation case is 200MW thermal power plant unit, and sudden load change has occurred in unit at runtime.
Fig. 2 is high pitch rating curve, when valve is just opened, by the steam flow very little of valve, with valve
The increase of door aperture, steam flow increase, but when close to maximum opening, and nonlinear spy is presented in steam flow and valve opening
Property；Fig. 3 is the arrangement of nozzles figure of unit in embodiment；Fig. 4 is load mutation failure mechanism schematic diagram, valve head and valve stem connecting part
There is abrasion in position, valve head has loose phenomenon, and there are a balances between valve head gravity and steam flow power, when valve opening is smaller, steam
Air-flow power caused by vapour is not enough to overcome valve head self gravity, even if valve opening increases, also flows through the valve without steam,
Until steam flow power is large enough to overcome valve head gravity, valve is opened suddenly, makes steam flow mutation phenomenon, and then is generated negative
Lotus mutation；Fig. 5, Fig. 6 are the time-domain diagram that changed power when sudden load change phenomenon occurs for unit.Test result finds 4 high pitch
There is different degrees of volatile fault, wherein the failure with GV2 is the most serious, apparent phenomenon of the failure twice occurs.
Fig. 7 is the characteristic curve of high pitch that unit breaks down, the calculation method introduced by step 2 it can be seen that
In 30% aperture, aperture increases GV2 but flow first drops and increases afterwards, and the variation of flowed fluctuation value accounts for 13% left side of entire pitch flow
It is right；And at 43% aperture, there is sudden load change (accounting for 10% or so of entire pitch flow)；
Downstream pressure time-domain diagram when Fig. 8, Fig. 9 are unit high pitch GV2 failure, two downstream pressure measuring point variation diagrams point
It is not corresponding with two figures in Fig. 5, Fig. 6.Because the relative variation of downstream pressure is bigger；In addition, downstream pressure
It is used as a detection variable in day-to-day operation, the fm capacity of assessment unit pitch in real time can be used to；Especially unit tune
Door there are small gap, 2MW is less than to loading effects when, by observation downstream pressure the fault point can also be judged at which
Pitch and fault severity level.In practice, if pitch is more slow in one's movements, sudden load change can be smaller again；Although this
The fm capacity of unit is influenced, operations staff just compares where the problem that is difficult to find.In contrast, using increase proposed in this paper
The method of downstream pressure measuring point is just readily seen the presence of the two sudden load changes.
Figure 10 (1)~(3) are respectively that the coupling part of the high pitch of unit failure promotes axis figure, big nut figure, connector sleeve figure,
By the high pitch whole device of maintenance down, result verification big nut promotes axis, intermediate connecting sleeve partially due to wearing and existing
Gap results in the load dump of unit appearance.
The above description is only a preferred embodiment of the present invention, is not intended to limit the scope of the invention, all at this
Under the inventive concept of invention, using equivalent structure transformation made by description of the invention and accompanying drawing content, or directly/use indirectly
It is included in other related technical areas in scope of patent protection of the invention.
Claims (3)
1. a kind of appraisal procedure for the high pitch fm capacity of steam turbine for improving peak load regulation, which is characterized in that including walking as follows
It is rapid:
S10 is in the case where unit is in normal load operating region, when acquiring the valve opening of each high pitch of unit from 0 to standard-sized sheet
The DCS data of downstream pressure；
S20 is arranged unit and operates normally, and calculates steam flow of each high pitch in different valve openings；
Steam stream of the S30 according to the valve opening and each high pitch calculated of each high pitch of unit in different valve openings
Amount draws valve opening and steam flow relation curve, and the relation curve drawn matches with factory design relation curve, if
Match, then enters in next step；
S40 data of any two adjacent moment from the DCS data of downstream pressure collected, which make the difference, obtains absolute difference, from
Maximum difference absolute value is selected to be defined as Δ P ' in resulting absolute differencemax, the Δ P ' of selectionmaxMultiplied by COEFFICIENT K, K > 1 is obtained
To maximum value Δ Pmax,, i.e.,
ΔPmax=K Δ P 'max(MPa), the minimum value that downstream pressure absolute difference can be got between adjacent moment is 0, is obtained
The value interval of downstream pressure absolute difference is [0, Δ Pmax], i.e.,；
| Δ P |=| Pn+1-Pn|(MPa)；
S50 sets the downstream pressure data of unit at a time Tn acquisition as Pn, presses after the valve acquired in subsequent time Tn+1
Force data is Pn+1, then the absolute value of the pressure variety within this time are as follows:
| Δ P |=| Pn+1-Pn| (MPa) (2),
Judgement | Δ P | value whether in section [0, Δ Pmax], as | Δ P | value when exceeding the section, determine that high pitch is deposited
In hardware fault.
2. improving the appraisal procedure of the high pitch fm capacity of steam turbine of peak load regulation as described in claim 1, feature exists
In the S30 includes:
S301 is in the case where unit is in load operating region, and according to the operation operating instruction of unit, the method for operation is cut by sequence valve
Single valve is shifted to, and unit load is risen to 95% on this basis；
S302 releases unit cooperative control and automatic sliding pressure operation control subtracts on the basis of keeping unit load to be basically unchanged
The main steam pressure of small unit and the comprehensive valve bit instruction for increasing unit simultaneously, make the high pitch of unit reach the state of standard-sized sheet,
According to whether there is sudden load change phenomenon during this, it is determined as software fault reason or hardware fault reason；
S303 is tested with the two valve standard-sized sheets and three valve standard-sized sheets that diagonally into vapour for two valve point steam admission modes, carry out at least two groups respectively,
According to whether occurring sudden load change phenomenon during this, failure cause determined by S202 is verified；
S304 is acquired and is carried out configuration and continuous recording data in DCS, is divided within 1s between acquisition time, and Fu Liugeer public affairs are passed through
Formula utilizes above-mentioned related data collected, and the discharge characteristic for carrying out high pitch calculates, and obtains hardware fault feature, judges valve
Hardware fault and severity, the Fu Liugeer formula are；
Wherein, G is metered flow；G' is variable working condition flow；p1For specified main steam pressure；p2For pressure after governing stage；p1' be
Main vapour pressure when variable working condition；p2' be variable working condition when governing stage after pressure；t1For specified main steam temperature；t1' be variable working condition when
Main steam temperature；
S305 draws high pitch actual flow and valve opening relation curve, the pass drawn according to the actual flow being calculated
It is that curve matches with factory design relation curve, if matching, enters in next step.
3. improving the appraisal procedure of the high pitch fm capacity of steam turbine of peak load regulation as claimed in claim 2, feature exists
In the S30 further include:
If S306 is not matched that, lofty tone gate valve is adjusted according to the gap of the relation curve and factory design relation curve drawn
Bar lifting travel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810387795.4A CN110080833B (en) | 2018-04-26 | 2018-04-26 | Method for evaluating frequency modulation capability of high-speed governing valve of steam turbine for improving peak shaving of unit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810387795.4A CN110080833B (en) | 2018-04-26 | 2018-04-26 | Method for evaluating frequency modulation capability of high-speed governing valve of steam turbine for improving peak shaving of unit |
Publications (2)
| Publication Number | Publication Date |
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| CN110080833A true CN110080833A (en) | 2019-08-02 |
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| CN115749986A (en) * | 2022-11-17 | 2023-03-07 | 国家能源集团内蒙古电力有限公司 | Method and device for monitoring running state of high-speed regulating valve, unit and electronic equipment |
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