CN105092157B - A kind of internal leakage of valve of thermodynamic system in power plant diagnostic method and diagnostic system - Google Patents
A kind of internal leakage of valve of thermodynamic system in power plant diagnostic method and diagnostic system Download PDFInfo
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Abstract
The invention provides a kind of internal leakage of valve of thermodynamic system in power plant diagnostic method and diagnostic system, whether there are main pipe or threeway in pre-determined distance before valve by judging high-end valve to be measured, and whether high-end valve to be measured meets the first measurement temperature condition, the first measurement damp condition and the second measurement temperature condition, realize the detection one by one to the high producing cause of valve body temperature, the high situation of valve body temperature caused by interior leakage is not due to so as to analyze and exclude, the diagnosis to valves leakage is realized.Only realized accordingly, with respect to prior art by a Rule of judgment for valves leakage diagnosis, substantially increase the accuracy rate diagnosed to valves leakage.
Description
Technical field
The present invention relates to valves leakage diagnostic techniques field, more specifically to a kind of power plant therrmodynamic system valve
Interior leakage diagnostic method and diagnostic system.
Background technology
Inside fail to pinpoint a disease in diagnosis to break and refer in therrmodynamic system is run, the high-end valve being closed is after thermal balance, if valve
Temperature is higher, then whether diagnose valve body temperature high by methods such as detection, calculating, analyses is to leak institute by high-end valve internal
The process caused.
Conventional interior leakage diagnostic method is temperature survey diagnostic method at present, is closed in high-end valve and after thermal balance, if
Valve body temperature is not higher than 50 DEG C, then it is assumed that the not interior leakage of high-end valve.Due to this diagnostic method do not have sufficient scientific basis with
Identification standard, in actual use, has 30% or so False Rate.That is, high-end valve temperature height removes valve
Leakage is outer in door, also other reasonses, for example, other high-end valves leakages cause etc..Therefore, how to provide in one kind fail to pinpoint a disease in diagnosis it is disconnected
Method is those skilled in the art's technical problem urgently to be resolved hurrily to improve the accuracy rate diagnosed to valves leakage.
The content of the invention
In view of this, the present invention provides a kind of internal leakage of valve of thermodynamic system in power plant diagnostic method and diagnostic system, with reality
Now to the Accurate Diagnosis of valves leakage.
A kind of internal leakage of valve of thermodynamic system in power plant diagnostic method, including：
After the high-end valve thermal balance to be measured being closed, judge before the valve of the high-end valve to be measured default
Whether there are main pipe or threeway in distance；
If having the main pipe or the threeway in the pre-determined distance scope before the valve, the high-end valve to be measured is judged
Whether first measurement temperature condition is met；
If the high-end valve to be measured meets the first measurement temperature condition, the high-end valve to be measured is diagnosed to be not
Interior leakage；
If the high-end valve to be measured is unsatisfactory for the first measurement temperature condition, the high-end valve to be measured is diagnosed to be
Interior leakage；
If there is no the main pipe or the threeway in the pre-determined distance scope before the valve, the high end valve to be measured is judged
Whether door meets the first measurement damp condition；
If the high-end valve to be measured meets the first measurement damp condition, judge whether the high-end valve to be measured is full
Foot the first measurement temperature condition；
If the high-end valve to be measured meets the first measurement temperature condition, the high-end valve to be measured is diagnosed to be not
Interior leakage；
If the high-end valve to be measured is unsatisfactory for the first measurement temperature condition, the high-end valve to be measured is diagnosed to be
Interior leakage；
If the high-end valve to be measured is unsatisfactory for the first measurement damp condition, whether the high-end valve to be measured is judged
Meet the second measurement temperature condition；
If the high-end valve to be measured meets the second measurement temperature condition, the high-end valve to be measured is diagnosed to be not
Interior leakage；
If the high-end valve to be measured is unsatisfactory for the second measurement temperature condition, the high-end valve to be measured is diagnosed to be
Interior leakage.
It is preferred that, the first measurement temperature condition is less than 50 DEG C, or institute for temperature after the valve of the high-end valve to be measured
State temperature after valve and be not less than 50 DEG C and less than the half of temperature before the valve of the high-end valve to be measured.
It is preferred that, the first measurement damp condition exceedes for humidity in the heat-insulation layer before the valve of the high-end valve to be measured
The outer humidity of heat-insulation layer.
It is preferred that, the second measurement temperature condition exceedes temperature before valve for temperature after the valve of the high-end valve to be measured.
It is preferred that, it is full in the high-end valve to be measured if only having the main pipe in the pre-determined distance scope before the valve
In the case of foot the first measurement temperature condition, then the high-end valve to be measured is diagnosed to be for valve body caused by direct heat transfer
Temperature is high.
It is preferred that, it is full in the high-end valve to be measured if only having the threeway in the pre-determined distance scope before the valve
In the case of foot the first measurement temperature condition, then the high-end valve to be measured is diagnosed to be for valve body caused by indirect heat transmission
Temperature is high.
It is preferred that, if the high-end valve to be measured meets the first measurement damp condition, in the high-end valve to be measured
In the case of meeting the first measurement temperature condition, then the high-end valve to be measured is diagnosed to be for the micro- caused valve that leaks of working medium
Temperature is high.
It is preferred that, if the high-end valve to be measured is unsatisfactory for the first measurement damp condition, in the high end valve to be measured
In the case that door meets the second measurement temperature condition, then it is diagnosed to be the high-end valve to be measured and causes for other valves leakages
Valve body temperature it is high.
A kind of internal leakage of valve of thermodynamic system in power plant diagnostic system, including：
First judging unit, for after the high-end valve thermal balance to be measured being closed, judging the height to be measured
Whether there are main pipe or threeway in pre-determined distance before the valve of end valve door；
Second judging unit, if for having the main pipe or the threeway in the pre-determined distance scope before the valve, sentencing
Whether the high-end valve to be measured that breaks meets the first measurement temperature condition；
First not interior leakage diagnosis unit, if meeting the first measurement temperature condition for the high-end valve to be measured,
It is diagnosed to be the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit in first, if being unsatisfactory for the first measurement temperature condition for the high-end valve to be measured,
It is diagnosed to be the high-end valves leakage to be measured；
3rd judging unit, if for there is no the main pipe or the threeway in the pre-determined distance scope before the valve,
Judge whether the high-end valve to be measured meets the first measurement damp condition；
4th judging unit, if meeting the first measurement damp condition for the high-end valve to be measured, judges described
Whether high-end valve to be measured meets the first measurement temperature condition；
Second not interior leakage diagnosis unit, if meeting the first measurement temperature condition for the high-end valve to be measured,
It is diagnosed to be the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit in second, if being unsatisfactory for the first measurement temperature condition for the high-end valve to be measured,
It is diagnosed to be the high-end valves leakage to be measured；
5th judging unit, if being unsatisfactory for the first measurement damp condition for the high-end valve to be measured, judges institute
State whether high-end valve to be measured meets the second measurement temperature condition；
3rd not interior leakage diagnosis unit, if meeting the second measurement temperature condition for the high-end valve to be measured,
It is diagnosed to be the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit in 3rd, if being unsatisfactory for the second measurement temperature condition for the high-end valve to be measured,
It is diagnosed to be the high-end valves leakage to be measured.
It is preferred that, the first measurement temperature condition is less than 50 DEG C, or institute for temperature after the valve of the high-end valve to be measured
State temperature after valve and be not less than 50 DEG C and less than the half of temperature before the valve of the high-end valve to be measured.
It is preferred that, the first measurement damp condition exceedes for humidity in the heat-insulation layer before the valve of the high-end valve to be measured
The outer humidity of heat-insulation layer.
It is preferred that, the second measurement temperature condition exceedes temperature before valve for temperature after the valve of the high-end valve to be measured.
It can be seen from above-mentioned technical scheme that, the invention provides a kind of internal leakage of valve of thermodynamic system in power plant diagnostic method and diagnosis
Whether there are main pipe or threeway, and high-end valve to be measured in pre-determined distance before system, the valve by judging high-end valve to be measured
The first measurement temperature condition, the first measurement damp condition and the second measurement temperature condition are whether met, is realized high to valve body temperature
The detection one by one of producing cause, is not due to the high situation of valve body temperature caused by interior leakage so as to analyze and exclude, realizes to valve
The diagnosis of leakage in door.Only realized accordingly, with respect to prior art by a Rule of judgment for valves leakage diagnosis, significantly
Improve the accuracy rate diagnosed to valves leakage.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of internal leakage of valve of thermodynamic system in power plant diagnostic method flow chart disclosed in the embodiment of the present invention；
Fig. 2 is a kind of structural representation of internal leakage of valve of thermodynamic system in power plant diagnostic system disclosed in the embodiment of the present invention
Figure.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, it is every other that those of ordinary skill in the art are obtained under the premise of creative work is not made
Embodiment, belongs to the scope of protection of the invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of internal leakage of valve of thermodynamic system in power plant diagnostic method flow chart, bag
Include step：
S11, after the high-end valve thermal balance to be measured being closed, judge before the valve of the high-end valve to be measured
Whether there are main pipe or threeway in pre-determined distance, if it is, performing step S12, otherwise, perform step S13；
Wherein, depending on pre-determined distance foundation actual conditions, preferably 1.5 meters.
S12, judge whether the high-end valve to be measured meets the first measurement temperature condition, if it is, performing step
S16, otherwise, performs step S17；
First measurement temperature condition is less than 50 DEG C (i.e. 50 DEG C of temperature ＜ after valve) for temperature after the valve of high-end valve to be measured, or
Temperature is not less than 50 DEG C and less than half (the i.e. temperature after 50 DEG C≤valve of temperature before the valve of the high-end valve to be measured after the valve
Temperature before the valves of ＜ 1/2).
Wherein, temperature refers to flowing to by medium before valve, what admission line was measured with valve body weld bond close to admission line side
Temperature.
Temperature refers to flowing to by medium after valve, the temperature that outlet pipe is measured with valve body weld bond close to outlet pipe side.
S13, judge whether the high-end valve to be measured meets the first measurement damp condition, if fruit is to perform step
S14, otherwise, performs step S15；
First measurement damp condition exceedes heat-insulation layer exogenous damp for humidity in the heat-insulation layer before the valve of the high-end valve to be measured
Degree.
S14, judge whether the high-end valve to be measured meets the first measurement temperature condition, if it is, performing step
Rapid S16, otherwise, performs step S17；
S15, judge whether the high-end valve to be measured meets the second measurement temperature condition, if it is, performing step
S16, otherwise, performs step S17；
Second measurement temperature condition exceedes temperature (temperature ＞ i.e. after valve before valve for temperature after the valve of the high-end valve to be measured
Temperature before valve).
S16, it is diagnosed to be the not interior leakage of the high-end valve to be measured.
S17, it is diagnosed to be the high-end valves leakage to be measured.
It should be noted is that, the first measurement temperature condition in the present embodiment, the first measurement damp condition and the
Two measurement temperature conditions are obtained by theory with practice, therefore, the deagnostic structure obtained according to above three condition
With very high accuracy.
It can be seen from above-mentioned technical scheme that, before valve of the present invention by judging high-end valve to be measured in pre-determined distance
Whether have main pipe or a threeway, and high-end valve to be measured whether meet the first measurement temperature condition, the first measurement damp condition and
Second measurement temperature condition, realizes detection one by one to the high producing cause of valve body temperature, so that in analyzing and excluding and be not due to
The high situation of valve body temperature caused by leakage, realizes the diagnosis to valves leakage.Only sentenced accordingly, with respect to prior art by one
Broken strip part is realized for valves leakage diagnosis, substantially increases the accuracy rate diagnosed to valves leakage, and then reduce valve
Influence of the interior leakage to the economy, security and environment of power plant.
Find that the reason for causing valve body temperature high has a lot, mainly included by substantial amounts of theory analysis and engineering survey
Following reason：
First, there is interior leakage in valve；
2nd, valve body temperature caused by direct heat transfer is high；
3rd, valve body temperature caused by indirect heat transmission is high；
4th, the micro- caused valve body temperature that leaks of working medium (steam) is high；
5th, there is valve body temperature height caused by heat conduct retrograde in other valve leaks.
It can be seen from practical experience for many years and data statistics, the ratio that valve body temperature height but valve do not have interior leakage accounts for whole
(management and maintenance management in the future etc. when being installed with each power plant design are more for 20%-the 30% of the high high-end valve of valve body temperature
The factor of kind is relevant)；Wherein more than 98% not have the high-end valve temperature height of interior leakage be by two in above-mentioned reason, three, four
Caused with five.
Elaborate and cause the reason for high-end valve temperature is high and correlated judgment condition：
First, there is interior leakage in valve
One before the high-end valve being closed in power system, valve connection be in main pipe, main pipe be high temperature
It is then vacuum state (steam turbine) or the gas (boiler) close to normal temperature and pressure after the overheated steam of high pressure, valve.Mistake in main pipe
Heat steam is like a heat reservoir, and the pipeline and valve being connected with main pipe without connecting (directed flow that vapor is not present)
Then with more and more remote with main pipe distance, temperature is gradually reduced.Because interior leakage refers to being in the valve of closed mode, still have
Overheated steam continuously passes through the phenomenon in pipeline after valve directed flow to valve from main pipe.Therefore, as interior leakage is leaked
The temperature of the increase of amount, valve body and coupled pipeline can also be increased.
2nd, valve body temperature caused by direct heat transfer is high
Direct heat transfer refers to that superheated steam in main pipe passes through direct because valve and the space length of main pipe are too near
The valve body temperature rise that heat transfer is caused.Gained knowledge and understood according to heating power, the ground nearer from high temperature heat source under thermal equilibrium state
Fang Wendu is higher.So if temperature of the valve body after the more near then thermal balance of main pipe is higher.In electric power system design standard,
Valve should be more than 1.5 meters apart from main pipe, but the distance of the part valve of part power plant and main pipe is practically without reaching this
Standard.If valve body temperature height be direct heat transfer institute extremely, as long as the equipment one be connected with the valve puts into operation, valve body will holding
High temperature, will not reduce also will not when it is high when it is low.
Rule of judgment, when only having main pipe in pre-determined distance scope before valve, described is met in the high-end valve to be measured
In the case of one measurement temperature condition, then it is that valve body temperature caused by direct heat transfer is high to be diagnosed to be the high-end valve to be measured.
3rd, valve body temperature caused by indirect heat transmission is high
Indirect heat transmission refers to nearby there is threeway (in pre-determined distance) before valve, when valve is closed, threeway
Other two due to there is the flowing of superheated vapor and made by way of heat transfer valve body temperature raise.Except due to valve
Easily produce that temperature is too high outer from threeway hypotelorism, another feature of indirect heat transmission is that have steam flowing at threeway
When, the rise of valve body temperature, if flowed without steam, valve body temperature is not raised.Valve body temperature is embodied in operation side
The change of formula and change, this feature is also the difference of indirect heat transmission and direct heat transfer.
Rule of judgment is full in high-end valve to be measured when only having the threeway in the pre-determined distance scope before the valve
In the case of the first measurement temperature condition of foot, then the high-end valve to be measured is diagnosed to be for valve body temperature caused by indirect heat transmission
It is high.
4th, the micro- caused valve body temperature that leaks of working medium (steam) is high
The micro- high pressure high temperature vapor for referring to should being used to generate electricity in the duct originally that leaks of working medium, is welded by pipeline or pipeline
Certain atomic slot leakage on mouth (also has the interface of the flange connection in heat-insulation layer, adjusts the valve rod of door into heat-insulation layer
Place etc.).The superheated vapor of leakage is moved and heating and thermal insulation layer and pipeline in heat-insulation layer so that valve body temperature is raised.Exist micro-
The feature leaked has：Heat-insulation layer interior humidity is higher than heat-insulation layer outer moisture；The external skin temperatures of heat-insulation layer are apparently higher than design load；
There is indeterminable phenomenon, etc. when heat-insulation layer is with outside transition position infrared temperature-measuring gun thermometric.
The cooperation of the micro- filler for taking the form of high pressure valve itself leaked of also a kind of working medium and valve rod and stuffing-box
Place occur working medium leak (containing not in heat-insulation layer flange connection interface, adjust door valve rod at etc.).This working medium is micro-
As long as the atomic small amount that leaks can just raise valve body temperature a lot, and naked eyes are not easy to find.Leaked although this working medium is micro-
Heat-insulation layer interior humidity is not resulted in higher than heat-insulation layer outer moisture, but humidity is substantially higher at the cooperation of stuffing-box, at some
There is indeterminable phenomenon etc. position when also having infrared temperature-measuring gun thermometric.
Rule of judgment, when high-end valve to be measured meets the first measurement damp condition, in the high-end valve to be measured
In the case of meeting the first measurement temperature condition, then it is the micro- caused valve body temperature that leaks of working medium to be diagnosed to be the high-end valve to be measured
Degree is high.
5th, there is valve body temperature height caused by heat conduct retrograde in other valve leaks
Heat conduct retrograde refers to that temperature is higher than temperature before valve after valve, and design has been run counter in the direction of this heat flowing
Original intention.When there is the reverse heat transfer of heat, it is likely to which the valve in the other somewhere of system there occurs interior leakage, cause the temperature after valve
Degree is higher than the temperature before valve, and now heat is transmitted to before valve after valve so that valve body temperature rise herein.
Rule of judgment is full in the high-end valve to be measured when high-end valve to be measured is unsatisfactory for the first measurement damp condition
In the case of foot the second measurement temperature condition, then the high-end valve to be measured is diagnosed to be for valve caused by other valves leakages
Temperature is high.
It in summary it can be seen, cause two, three, four and five in the high several reasons of valve body temperature to be led substantially by all above
The reason for causing non-interior leakage valve temperature high all cover including (except minimum hot because not meeting as defined in power rule of law of accounting
Except in the case of valve body temperature caused by Force system arrangement is high), only pass through a Rule of judgment reality accordingly, with respect to prior art
Now for valves leakage diagnosis, the accuracy rate diagnosed to valves leakage is substantially increased, and then reduce valves leakage to electricity
The influence of the economy of factory, security and environment.
It should be noted is that, valve body temperature caused by direct heat transfer is high, valve body temperature caused by indirect heat transmission
Height, and high-end valve to be measured is unsatisfactory for the first measurement damp condition simultaneously and the second measurement temperature condition valves leakage occurs and drawn
The valve body temperature risen is high, and these three situations can be proved using quantitative calculation method or quantitatively calculated.
It is corresponding with above method embodiment, be the invention also discloses a kind of diagnosis of internal leakage of valve of thermodynamic system in power plant
System.
Referring to Fig. 2, a kind of structure of internal leakage of valve of thermodynamic system in power plant diagnostic system is shown disclosed in the embodiment of the present invention
It is intended to, including：
First judging unit 21, for after the high-end valve thermal balance to be measured being closed, judging described to be measured
Whether there are main pipe or threeway before the valve of high-end valve in pre-determined distance, if it is, performing the second judging unit 22, otherwise hold
The judging unit 25 of row the 3rd；
Wherein, depending on pre-determined distance foundation actual conditions, preferably 1.5 meters.
Second judging unit 22, if for having the main pipe or the threeway in the pre-determined distance scope before the valve,
Judge whether the high-end valve to be measured meets the first measurement temperature condition, if it is, performing the first not interior leakage diagnosis unit
23, otherwise, perform leakage diagnosis unit 24 in first；
First measurement temperature condition is less than 50 DEG C (i.e. 50 DEG C of temperature ＜ after valve) for temperature after the valve of high-end valve to be measured, or
Temperature is not less than 50 DEG C and less than half (the i.e. temperature after 50 DEG C≤valve of temperature before the valve of the high-end valve to be measured after the valve
Temperature before the valves of ＜ 1/2).
Wherein, temperature refers to flowing to by medium before valve, what admission line was measured with valve body weld bond close to admission line side
Temperature.
Temperature refers to flowing to by medium after valve, the temperature that outlet pipe is measured with valve body weld bond close to outlet pipe side.
First not interior leakage diagnosis unit 23, if meeting the first measurement temperature condition for the high-end valve to be measured,
Then it is diagnosed to be the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit 24 in first, if being unsatisfactory for the first measurement temperature condition for the high-end valve to be measured,
Then it is diagnosed to be the high-end valves leakage to be measured；
3rd judging unit 25, if for not having the main pipe or described three in the pre-determined distance scope before the valve
It is logical, judge whether the high-end valve to be measured meets the first measurement damp condition, if it is, the 4th judging unit 26 is performed,
Otherwise, the 5th judging unit 29 is performed；
First measurement damp condition exceedes heat-insulation layer exogenous damp for humidity in the heat-insulation layer before the valve of the high-end valve to be measured
Degree.
4th judging unit 26, if meeting the first measurement damp condition for the high-end valve to be measured, judges institute
State whether high-end valve to be measured meets the first measurement temperature condition, if it is, the second not interior leakage diagnosis unit 27 is performed,
Otherwise, leakage diagnosis unit 28 in second is performed；
Second not interior leakage diagnosis unit 27, if meeting the first measurement temperature condition for the high-end valve to be measured,
Then it is diagnosed to be the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit 28 in second, if being unsatisfactory for the first measurement temperature condition for the high-end valve to be measured,
Then it is diagnosed to be the high-end valves leakage to be measured；
5th judging unit 29, if being unsatisfactory for the first measurement damp condition for the high-end valve to be measured, judges
Whether the high-end valve to be measured meets the second measurement temperature condition, if it is, the 3rd not interior leakage diagnosis unit 30 is performed, it is no
Then, leakage diagnosis unit 31 in the 3rd is performed；
Second measurement temperature condition exceedes temperature (temperature ＞ i.e. after valve before valve for temperature after the valve of the high-end valve to be measured
Temperature before valve).
3rd not interior leakage diagnosis unit 30, if meeting the second measurement temperature condition for the high-end valve to be measured,
Then it is diagnosed to be the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit 31 in 3rd, if being unsatisfactory for the second measurement temperature condition for the high-end valve to be measured,
Then it is diagnosed to be the high-end valves leakage to be measured.
It should be noted is that, the first measurement temperature condition in the present embodiment, the first measurement damp condition and the
Two measurement temperature conditions are obtained by theory with practice, therefore, the deagnostic structure obtained according to above three condition
With very high accuracy.
It can be seen from above-mentioned technical scheme that, before valve of the present invention by judging high-end valve to be measured in pre-determined distance
Whether have main pipe or a threeway, and high-end valve to be measured whether meet the first measurement temperature condition, the first measurement damp condition and
Second measurement temperature condition, realizes detection one by one to the high producing cause of valve body temperature, so that in analyzing and excluding and be not due to
The high situation of valve body temperature caused by leakage, realizes the diagnosis to valves leakage.Only sentenced accordingly, with respect to prior art by one
Broken strip part is realized for valves leakage diagnosis, substantially increases the accuracy rate diagnosed to valves leakage, and then reduce valve
Influence of the interior leakage to the economy, security and environment of power plant.
Find that the reason for causing valve body temperature high has a lot, mainly included by substantial amounts of theory analysis and engineering survey
Following reason：
First, there is interior leakage in valve；
2nd, valve body temperature caused by direct heat transfer is high；
3rd, valve body temperature caused by indirect heat transmission is high；
4th, the micro- caused valve body temperature that leaks of working medium (steam) is high；
5th, there is valve body temperature height caused by heat conduct retrograde in other valve leaks.
It can be seen from practical experience for many years and data statistics, the ratio that valve body temperature height but valve do not have interior leakage accounts for whole
(management and maintenance management in the future etc. when being installed with each power plant design are more for 20%-the 30% of the high high-end valve of valve body temperature
The factor of kind is relevant)；Wherein more than 98% not have the high-end valve temperature height of interior leakage be by two in above-mentioned reason, three, four
Caused with five.
Wherein, the reason for high-end valve temperature is high and correlated judgment condition are caused referring to embodiment of the method, herein not
Repeat again.
The embodiment of each in this specification is described by the way of progressive, and what each embodiment was stressed is and other
Between the difference of embodiment, each embodiment identical similar portion mutually referring to.
The foregoing description of the disclosed embodiments, enables professional and technical personnel in the field to realize or using the present invention.
A variety of modifications to these embodiments will be apparent for those skilled in the art, as defined herein
General Principle can be realized in other embodiments without departing from the spirit or scope of the present invention.Therefore, it is of the invention
The embodiments shown herein is not intended to be limited to, and is to fit to and principles disclosed herein and features of novelty phase one
The most wide scope caused.
Claims (12)
1. a kind of internal leakage of valve of thermodynamic system in power plant diagnostic method, it is characterised in that including：
After the high-end valve thermal balance to be measured being closed, judge before the valve of the high-end valve to be measured in pre-determined distance
Inside whether there are main pipe or threeway；
If having the main pipe or the threeway in the pre-determined distance scope before the valve, whether the high-end valve to be measured is judged
Meet the first measurement temperature condition；
If the high-end valve to be measured meets the first measurement temperature condition, the high-end valve to be measured is diagnosed to be not interior
Leakage；
If the high-end valve to be measured is unsatisfactory for the first measurement temperature condition, it is diagnosed to be in the high-end valve to be measured
Leakage；
If there is no the main pipe or the threeway in the pre-determined distance scope before the valve, judge that the high-end valve to be measured is
It is no to meet the first measurement damp condition；
If the high-end valve to be measured meets the first measurement damp condition, judge whether the high-end valve to be measured meets institute
State the first measurement temperature condition；
If the high-end valve to be measured meets the first measurement temperature condition, the high-end valve to be measured is diagnosed to be not interior
Leakage；
If the high-end valve to be measured is unsatisfactory for the first measurement temperature condition, it is diagnosed to be in the high-end valve to be measured
Leakage；
If the high-end valve to be measured is unsatisfactory for the first measurement damp condition, judge whether the high-end valve to be measured meets
Second measurement temperature condition；
If the high-end valve to be measured meets the second measurement temperature condition, the high-end valve to be measured is diagnosed to be not interior
Leakage；
If the high-end valve to be measured is unsatisfactory for the second measurement temperature condition, it is diagnosed to be in the high-end valve to be measured
Leakage.
2. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that described first surveys
Amount temperature condition is less than temperature after 50 DEG C, or the valve for temperature after the valve of the high-end valve to be measured and is not less than 50 DEG C and is less than
The half of temperature before the valve of the high-end valve to be measured.
3. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that described first surveys
Measure damp condition and exceed the outer humidity of heat-insulation layer for humidity in the heat-insulation layer before the valve of the high-end valve to be measured.
4. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that described second surveys
Amount temperature condition exceedes temperature before valve for temperature after the valve of the high-end valve to be measured.
5. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that if before the valve
Only have the main pipe in the pre-determined distance scope, the feelings of the first measurement temperature condition are met in the high-end valve to be measured
Under condition, then it is that valve body temperature caused by direct heat transfer is high to be diagnosed to be the high-end valve to be measured.
6. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that if before the valve
Only have the threeway in the pre-determined distance scope, the feelings of the first measurement temperature condition are met in the high-end valve to be measured
Under condition, then it is that valve body temperature caused by indirect heat transmission is high to be diagnosed to be the high-end valve to be measured.
7. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that if described to be measured
High-end valve meets the first measurement damp condition, and the first measurement temperature condition is met in the high-end valve to be measured
In the case of, then it is diagnosed to be the high-end valve to be measured high for the micro- caused valve body temperature that leaks of working medium.
8. internal leakage of valve of thermodynamic system in power plant diagnostic method according to claim 1, it is characterised in that if described to be measured
High-end valve is unsatisfactory for the first measurement damp condition, and the second measurement temperature condition is met in the high-end valve to be measured
In the case of, then it is that valve body temperature caused by other valves leakages is high to be diagnosed to be the high-end valve to be measured.
9. a kind of internal leakage of valve of thermodynamic system in power plant diagnostic system, it is characterised in that including：
First judging unit, for after the high-end valve thermal balance to be measured being closed, judging the high end valve to be measured
Whether there are main pipe or threeway in pre-determined distance before the valve of door；
Second judging unit, if for having the main pipe or the threeway in the pre-determined distance scope before the valve, judging institute
State whether high-end valve to be measured meets the first measurement temperature condition；
First not interior leakage diagnosis unit, if meeting the first measurement temperature condition for the high-end valve to be measured, is diagnosed
Go out the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit, if being unsatisfactory for the first measurement temperature condition for the high-end valve to be measured, is diagnosed in first
Go out the high-end valves leakage to be measured；
3rd judging unit, if for not having the main pipe or the threeway in the pre-determined distance scope before the valve, judging
Whether the high-end valve to be measured meets the first measurement damp condition；
4th judging unit, if meeting the first measurement damp condition for the high-end valve to be measured, judges described to be measured
Whether high-end valve meets the first measurement temperature condition；
Second not interior leakage diagnosis unit, if meeting the first measurement temperature condition for the high-end valve to be measured, is diagnosed
Go out the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit, if being unsatisfactory for the first measurement temperature condition for the high-end valve to be measured, is diagnosed in second
Go out the high-end valves leakage to be measured；
5th judging unit, if for the high-end valve to be measured be unsatisfactory for it is described first measurement damp condition, judge described in treat
Survey whether high-end valve meets the second measurement temperature condition；
3rd not interior leakage diagnosis unit, if meeting the second measurement temperature condition for the high-end valve to be measured, is diagnosed
Go out the not interior leakage of the high-end valve to be measured；
Leakage diagnosis unit, if being unsatisfactory for the second measurement temperature condition for the high-end valve to be measured, is diagnosed in 3rd
Go out the high-end valves leakage to be measured.
10. internal leakage of valve of thermodynamic system in power plant diagnostic system according to claim 9, it is characterised in that described first
Measurement temperature condition is less than temperature after 50 DEG C, or the valve for temperature after the valve of the high-end valve to be measured and is not less than 50 DEG C and low
In the half of temperature before the valve of the high-end valve to be measured.
11. internal leakage of valve of thermodynamic system in power plant diagnostic system according to claim 9, it is characterised in that described first
Measure damp condition and exceed the outer humidity of heat-insulation layer for humidity in the heat-insulation layer before the valve of the high-end valve to be measured.
12. internal leakage of valve of thermodynamic system in power plant diagnostic system according to claim 9, it is characterised in that described second
Measurement temperature condition exceedes temperature before valve for temperature after the valve of the high-end valve to be measured.
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| CN109709911B (en) * | 2018-12-11 | 2021-06-22 | 上海电力学院 | On-line measuring method and system for leakage of circulating working medium of thermal power generating unit |
| CN110083876B (en) * | 2019-04-01 | 2020-03-10 | 南京兆能节能科技有限公司 | Automatic analysis system and analysis method for internal leakage of high-temperature and high-pressure valve of power plant |
| CN112096958A (en) * | 2020-09-29 | 2020-12-18 | 核电运行研究(上海)有限公司 | Comprehensive online detection method for valves of nuclear power station |
| CN114414175A (en) * | 2022-01-17 | 2022-04-29 | 山东电力工程咨询院有限公司 | Thermodynamic system drain valve inner leakage detection method and system |
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