CN106969376A - A kind of boiler main fuel trip key reason analysis and Reconstruction in field measure method and system - Google Patents
A kind of boiler main fuel trip key reason analysis and Reconstruction in field measure method and system Download PDFInfo
- Publication number
- CN106969376A CN106969376A CN201710229291.5A CN201710229291A CN106969376A CN 106969376 A CN106969376 A CN 106969376A CN 201710229291 A CN201710229291 A CN 201710229291A CN 106969376 A CN106969376 A CN 106969376A
- Authority
- CN
- China
- Prior art keywords
- chaser
- main fuel
- boiler main
- flue gas
- baffle door
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2231/00—Fail safe
- F23N2231/10—Fail safe for component failures
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical means
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure method and system, by judging whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if, it is determined that chimney inlet flue gas baffle door occurs abnormal；Determine to detect after baffle door exception and reopen the current value after chimney inlet flue gas baffle door after the current value and chaser of air-introduced machine before chaser, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen the current value after chimney inlet flue gas baffle door, if, then determine the reason for cause boiler main fuel trip it is that chimney inlet flue gas baffle door is not turned on and generates corresponding first signal sending to DCS system, the technical problem for leading to not the correct reason for drawing boiler main fuel trip can not be detected so as to solve DCS system when chimney inlet flue gas baffle door occurs in that exception.
Description
Technical field
The present invention relates to boiler exam area of maintenance, more particularly to a kind of analysis of boiler main fuel trip key reason and Reconstruction in field
Measure method and system.
Background technology
Economic society is continued to develop therewith, and operation safe and stable to thermal power generation proposes more preferable requirement.How to protect
Demonstrate,prove Electronic boiler and be in safe and stable running status, reduce boiler down accident caused by artificial origin, put in all thermoelectricitys
The key technical problem that factory technical staff faces.Boiler main fuel trip (Main Fuel Trip) event is transported to power plant or even power grid security
Row brings very big potential safety hazard.
Such as, certain Power Plant No.1 unit on January 12nd, 2017,13：53：26, two air-introduced machines of the boiler report while breathing heavily is shaken
Alert, combustion chamber draft becomes just and significantly risen, 53：32, No. 1 boiler furnace pressure height 3 seconds protection acts of delay, boiler main fuel trip is jumped
Lock, subsidiary engine interlocking regular event, #1 unit chasers.
Boiler main fuel trip tripping operation result in unit chaser, and the safe operation to power network brings serious influence, also, if
It is that chimney inlet flue gas baffle door occurs in that exception, boiler is safeguarded because chimney inlet flue gas baffle door switching signal is not accessed
DCS system, therefore in DCS system do not check exception, lead to not the correct reason for drawing boiler main fuel trip.
The content of the invention
The embodiments of the invention provide a kind of analysis of boiler main fuel trip key reason and Reconstruction in field measure method and system, use
DCS system, which can not be detected, when solution chimney inlet flue gas baffle door occurs in that exception leads to not draw boiler main fuel trip just
The technical problem of true reason.
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure method, including：
S1：Judge whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if so, then
Determine that chimney inlet flue gas baffle door exception occurs and performs step S2, if it is not, then terminating；
S2：Detection reopens the electricity after chimney inlet flue gas baffle door before chaser after the current value and chaser of air-introduced machine
Flow valuve, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen after chimney inlet flue gas baffle door
Current value, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door is not turned on and generates corresponding
One signal is sent to DCS system.
Preferably, also include after the step S2：
S3：The neat stress pressure value before the chimney entrance before chaser is detected, if the net cigarette before the chimney entrance before chaser
Air pressure force value is in default number range, it is determined that gas baffle door is not as the disturbance of flue gas and closed and generate phase
The secondary signal answered is sent to DCS system.
Preferably, also include after the step S3：
S4：Perform boiler main fuel trip to start, detect the startup time of boiler main fuel trip, if the startup time reaches the default time,
Send and represent that boiler main fuel trip starts successful 3rd signal to DCS system.
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure system, including：
Baffle door abnormality detection module, for judge chaser leading fan operation electric current and movable vane aperture numerical value whether with
Time gradually increases, if, it is determined that there is exception and performs baffle plate door switch detection module in chimney inlet flue gas baffle door, if
It is no, then terminate；
Baffle plate door switch detection module, chimney is reopened for detecting before chaser after the current value and chaser of air-introduced machine
Current value after inlet flue gas baffle door, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen cigarette
Current value after chimney inlet flue gas baffle door, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door does not have
Have to open and generate corresponding first signal and send to DCS system.
Preferably, the embodiment of the present invention also includes：
Baffle door closes reason detection module, for detecting the neat stress pressure value before the chimney entrance before chaser, if
The neat stress pressure value before chimney entrance before chaser is in default number range, it is determined that gas baffle door is not as cigarette
The disturbance of gas and close and generate corresponding secondary signal and send to DCS system.
Preferably, the embodiment of the present invention also includes：
Boiler main fuel trip scene emergency start module, starts for performing boiler main fuel trip, detects the startup time of boiler main fuel trip, if
The startup time reaches the default time, then sends and represent that boiler main fuel trip starts successful 3rd signal to DCS system.
As can be seen from the above technical solutions, the embodiment of the present invention has advantages below：
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure method and system, lead to
Cross and judge whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if, it is determined that chimney
Inlet flue gas baffle door occurs abnormal；Determine to detect after baffle door exception before chaser after the current value and chaser of air-introduced machine again
The current value after chimney inlet flue gas baffle door is opened, and judges whether the current value of the air-introduced machine before chaser is more than weight after chaser
The new current value opened after chimney inlet flue gas baffle door, if, it is determined that the reason for causing boiler main fuel trip is chimney inlet flue gas
Baffle door is not turned on and generates corresponding first signal sending to DCS system, so as to solve chimney inlet flue gas baffle door
DCS system can not detect the technical problem for leading to not the correct reason for drawing boiler main fuel trip when occurring in that exception.
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, without having to pay creative labor, may be used also
To obtain other accompanying drawings according to these accompanying drawings.
Fig. 1 is a kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and the one of Reconstruction in field measure method
The schematic diagram of individual embodiment；
Fig. 2 analyzes another with Reconstruction in field measure method for a kind of boiler main fuel trip key reason provided in an embodiment of the present invention
The schematic diagram of one embodiment.
Embodiment
The embodiments of the invention provide a kind of analysis of boiler main fuel trip key reason and Reconstruction in field measure method and system, use
DCS system, which can not be detected, when solution chimney inlet flue gas baffle door occurs in that exception leads to not draw boiler main fuel trip just
The technical problem of true reason.
To enable goal of the invention, feature, the advantage of the present invention more obvious and understandable, below in conjunction with the present invention
Accompanying drawing in embodiment, the technical scheme in the embodiment of the present invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of embodiment of the invention, and not all embodiment.Based on the embodiment in the present invention, this area
All other embodiment that those of ordinary skill is obtained under the premise of creative work is not made, belongs to protection of the present invention
Scope.
Referring to Fig. 1, a kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure method
One embodiment, including：
101：Judge whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if so,
Then determine that chimney inlet flue gas baffle door exception occurs and performs step 102, if it is not, then terminating；
It should be noted that whether chaser leading fan operation electric current and the numerical value of movable vane aperture gradually increase with the time can
By detecting chaser leading fan operation electric current and the numerical value of movable vane aperture with the relation of time and with big corresponding of time value
Electric current and movable vane aperture numerical value subtract small corresponding electric current and movable vane the aperture numerical value of time value, show that positive number is then represented before chaser
Air-introduced machine running current and the numerical value of movable vane aperture were gradually increased with the time.
102：Detection is reopened after chimney inlet flue gas baffle door before chaser after the current value and chaser of air-introduced machine
Current value, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen after chimney inlet flue gas baffle door
Current value, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door is not turned on and generated corresponding
First signal is sent to DCS system.
It should be noted that the principle of this step is：
It has been standard-sized sheet if when gas baffle door is from start, because the disturbance of flue gas causes its moment to close what is returned
Assuming that being to set up, then the electric current of air-introduced machine should differ not with reopening the electric current after baffle door after chaser before chaser
Many.If the electric current after turning back on is to decline.This explanation gas baffle door is not standard-sized sheet, because if being standard-sized sheet,
So the preceding air-introduced machine electric current of chaser with reopened after chaser as rear air-introduced machine electric current should be, fact proved that electric current is not
The same, illustrate that flue resistance is variant before chaser and after chaser, the unique difference run before chaser with chaser rear pass is just
It is that gas baffle door is opened and fixed, the difference of resistance just comes from the resistance of gas baffle door, so as to prove cigarette before chaser
Gas baffle door is not standard-sized sheet.
In a word, a kind of boiler main fuel trip key reason provided in an embodiment of the present invention is analyzed with Reconstruction in field measure method with being
System, by judging whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if, it is determined that
Chimney inlet flue gas baffle door occurs abnormal；Determine to detect after baffle door exception before chaser after the current value and chaser of air-introduced machine
The current value after chimney inlet flue gas baffle door is reopened, and judges whether the current value of the air-introduced machine before chaser is more than chaser
The current value after chimney inlet flue gas baffle door is reopened afterwards, if, it is determined that the reason for causing boiler main fuel trip is chimney entrance
Gas baffle door is not turned on and generates corresponding first signal sending to DCS system, so as to solve chimney inlet flue gas gear
DCS system can not detect the technical problem for leading to not the correct reason for drawing boiler main fuel trip when plate door occurs in that exception.
Below by a kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure method
Another embodiment is described in detail.
Referring to Fig. 2, a kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure method
Another embodiment, including：
201：Judge whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if so,
Then determine that chimney inlet flue gas baffle door exception occurs and performs step 202, if it is not, then terminating；
202：Detection is reopened after chimney inlet flue gas baffle door before chaser after the current value and chaser of air-introduced machine
Current value, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen after chimney inlet flue gas baffle door
Current value, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door is not turned on and generated corresponding
First signal is sent to DCS system.
203：The neat stress pressure value before the chimney entrance before chaser is detected, if the net cigarette before the chimney entrance before chaser
Air pressure force value is in default number range, it is determined that gas baffle door is not as the disturbance of flue gas and closed and generate phase
The secondary signal answered is sent to DCS system.
It should be noted that if chimney inlet flue gas baffle door is constantly in the state almost closed from start, that
During from start to chaser, neat stress pressure is constantly in higher state, and than opening chimney inlet flue gas baffle plate
Neat stress pressure behind the door is high.
204：Perform boiler main fuel trip to start, detect the startup time of boiler main fuel trip, if the startup time reaches the default time,
Send and represent that boiler main fuel trip starts successful 3rd signal to DCS system.
The description of application examples will be carried out according to the situation of certain Power Plant below：
In the application example, chimney inlet flue gas baffle door can also be expressed as baffle door, gas baffle door at chimney position
Or baffle door.
Noon on January 12nd, 2017, #1 units band 328MW, boiler main, reheater pressure are 16.1 3.5MPa, are led, again
Vapours temperature be 544 540 DEG C.Heat pump is run, and CCS coordinates input.Air-introduced machine A B electric currents be respectively 391 394A, movable vane opens
Degree be respectively 82.3 82.7%.
13：53：26, #1 two, boiler air-introduced machines send out surge alarm simultaneously, and combustion chamber draft becomes just and significantly risen, 53：
32, #1 boiler furnace pressure height 3 seconds protection acts of delay, boiler main fuel trip tripping operation, subsidiary engine interlocking regular event, #1 unit chasers；
53：43, two air-introduced machines trip because surge is delayed 15 seconds.
14：03, operation restarting air-introduced machine A/B, air-introduced machine movable vane aperture to 29.3 29.3% when, on furnace pressure
428Pa or so is risen to, two air-introduced machines send out surge alarm and delay tripping simultaneously again.Because of two fan trip originals of #1 boilers
Because of not clear, unit pause startup, arrangement is remake after ascertaining the reason and handling well and is started.
14：20 or so, check state and the #2 desulfurization for finding that #1 desulfurization MGGH reheaters are exported to chimney suction isolating valve
The state of chimney suction isolating valve is inconsistent, approximately close to closed mode, and the isolating door is opened afterwards.
16：15 or so, #1 desulfurization MGGH reheaters are exported to chimney suction isolating valve and open and fix, and 16：40, #1 boilers
Air-introduced machine starts normally, and 19：58, #1 set grid-connection load carryings.
Understood by scene and found, chimney inlet flue gas baffle door is to shift original bypass flue baffle door to install
, because chimney inlet flue gas baffle door switching signal is not linked into DCS system, it is impossible to understand boiler main fuel trip front/rear door open and close
State, be that MFT event analysis brings very big technical difficulty.Therefore it can only be made from boiler field apparatus operational factor to analyze
The reason for into MFT events.
According to step 201：Judge whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time
Greatly, if, it is determined that there is exception and performs step 202 in chimney inlet flue gas baffle door, if it is not, then terminating；
Table 1 is drawn according to step 201：Air-introduced machine running current and aperture variation tendency；
Table 1
Before #1 unit chasers during air-introduced machine surge simultaneously, combustion chamber draft, which becomes, is just reaching pressure protection act, air-introduced machine entrance
Surge pressure becomes just and reaches 1000Pa or so, illustrates the normal surge action of air-introduced machine.
The possible cause for causing MFT events is：Chimney inlet flue gas baffle door is in the state almost closed, from start to
During chaser, the operating condition of air-introduced machine can change with the change of load.When at full capacity, due to chimney entrance cigarette
The flow resistance of gas baffle door is very big, and air-introduced machine running operating point deviates T.B. operating points too much, enters blower fan surge area
Cause unit chaser so as to occur blower fan surge.Because chimney entrance door open and close state is not linked into DCS, it is impossible to accurately obtain
The running status of door during unit operation, therefore chimney inlet flue gas baffle door is always during can not accurately drawing unit operation
Be closed, also another possibility be chimney inlet flue gas baffle door during unit operation due to flue gas disturb
Door is caused to progressively close off.The reason for boiler main fuel trip occurs is caused in order to further analyze, below from air-introduced machine electric current, neat stress pressure
Analysed in depth in terms of power, whether chimney inlet flue gas baffle door is constantly in closed mode during judging unit operation,
This is the key for analyzing boiler main fuel trip.
Accordingly, it would be desirable to carry out step 202：Detection reopens chimney after the current value and chaser of air-introduced machine before chaser and entered
The current value of mouthful gas baffle behind the door, and judge the current value of the air-introduced machine before chaser whether more than reopening chimney after chaser
Current value after inlet flue gas baffle door, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door does not have
Open and generate corresponding first signal and send to DCS system.
It should be noted that being standard-sized sheet if when gas baffle door is from start, because the disturbance of flue gas causes
It is to set up that its moment, which closes the hypothesis returned, then reopen the electricity after baffle door after the electric current and chaser of air-introduced machine before chaser
Stream should be more or less the same.By analyzing air-introduced machine current data between the unit runtime, operating real-time data takes a little 2017
12 days 01 month 04:22:Load is 162MW when 43, and air-introduced machine electric current A electric currents are 200A, and air-introduced machine electric current B electric currents are 199A.
On 01 13rd, 2017 03:53:Load is 162MW when 40, and air-introduced machine electric current A electric currents are 188A, and air-introduced machine electric current B electric currents are
189A.Electric current after turning back on is to decline.This explanation gas baffle door is not standard-sized sheet, because if being standard-sized sheet, that
The preceding air-introduced machine electric current of chaser with reopened after chaser as rear air-introduced machine electric current should be, fact proved that electric current is to differ
Sample, illustrate that flue resistance is variant before chaser and after chaser, the unique difference run before chaser with chaser rear pass is exactly
Gas baffle door is opened and fixed, the difference of resistance just comes from the resistance of gas baffle door, so as to prove flue gas before chaser
Baffle door is not standard-sized sheet.
It has been standard-sized sheet if when gas baffle door is from start, because the disturbance of flue gas causes it gradually to close
Hypothesis be to set up, then from start to during chaser, the electric current with load section air-introduced machine gradually rises.
Operating real-time data takes a little on 01 7th, 2,017 3:23:Load is 172MW when 46, and air-introduced machine electric current A electric currents are
200A, air-introduced machine electric current B electric current are 198A；On 01 11st, 2017 00:00:Load is 172MW, air-introduced machine electric current A electricity when 51
Flow for 194A, air-introduced machine electric current B electric currents are 195A.Obviously air-introduced machine electric current is basicly stable during.This explanation gas baffle
Can not possibly be during on-load, because the factors such as flue gas disturbance cause baffle door to be in open mode.
For further quantitative analysis different load section, air-introduced machine electric current, former flue gas pressures and boiler load before and after chaser
Change, by gathering boiler operatiopn data, choose steady load section, carried out data processing.In steady load section, to air inducing
Electromechanics stream, former flue gas pressures and average load have carried out the time and have been averaged, and obtain time average, are so convenient for score
Analysis.Table 2 (different load section parameter comparison table) gives the data of quantitative analysis.
Table 2
Following information can be drawn from the data of table 2：
Point 2017-01-18 09 is taken to operating real-time data:49:17 arrive 2017-01-18 11:53:During 21, this when
Between section chimney position baffle door have been switched on, No. 1 unit load is more stable, time average load be 300MW, air-introduced machine A electricity
Levelling average is 251.9A, and air-introduced machine B electric currents are 253.6A, and former flue gas pressures average value is 2605.8Pa.
Point 2017-01-12 08 is taken to operating real-time data:29:42 arrive 2017-01-12 09:02:During 14, this when
Between section chimney position baffle door be not turned on, No. 1 unit load is more stable, and average load is 297.2MW, air-introduced machine A electric currents
Average value is 331.9A, and air-introduced machine B electric currents are 334.2A, and former flue gas pressures average value is 5580.8Pa.
Point 2017-01-11 13 is taken to operating real-time data:49:40 arrive 2017-01-11 22:51:During 55, this when
Between section chimney position baffle door be not turned on, No. 1 unit load is more stable, and average load is 329.3MW, air-introduced machine A electric currents
Average value is 339.2A, and air-introduced machine B electric currents are 339.4A, and former flue gas pressures average value is 5775.8Pa.
Point 2017-01-10 00 is taken to operating real-time data:52:25 arrive 2017-01-10 02:18:During 13, this when
Between section chimney position baffle door be not turned on, No. 1 unit load is more stable, and average load is 305.0MW, air-introduced machine A electric currents
Average value is 290.0A, and air-introduced machine B electric currents are 287.8A, and former flue gas pressures average value is 4880.5Pa.
(load section is analyzed by the data before and after No. 1 boiler main fuel trip of selection:4：2017-01-1809:49:17
To 2017-01-18 11:53:21, load section 3：2017-01-12 08:29:42 arrive 2017-01-1209:02:14), it can obtain
Go out, after chimney position baffle door is fully open, air-introduced machine electric current declines substantially, have dropped nearly 80A, former flue gas pressures decline
2975.0Pa.Because the load section of selection is all in the stable stage at full capacity, air-introduced machine electric current declines a lot, illustrates flue gas cigarette
Atmidometer declines, and is further illustrated while have dropped nearly 2975Pa by former flue gas pressures, the reason for causing boiler main fuel trip is chimney
Baffle door at position is not turned on.
(load section 4 is analyzed by the data before and after No. 1 boiler main fuel trip of selection：2017-01-1809:49:17 arrive
2017-01-18 11:53:21, load section 1：2017-01-10 00:52:25 arrive 2017-01-1002:18:13), it can obtain
Go out, after chimney position baffle door is fully open, air-introduced machine electric current declines substantially, have dropped under nearly 38.0A, former flue gas pressures
2274.7Pa has dropped.Because the load section of selection is all in the stable stage at full capacity, air-introduced machine electric current declines a lot, illustrates flue gas
Drop in resistance, is further illustrated while have dropped nearly 2274Pa by former flue gas pressures, and the reason for causing boiler main fuel trip is chimney position
The baffle door at the place of putting is not turned on.It may be noted that load section 1 and load section 3, under same load, air-introduced machine electric current and original
Flue gas pressures have certain difference, this is used with boiler, and coal is relevant, and Coal rank causes exhaust gas volumn different, and air-introduced machine goes out
Power is variant.
Further, it is necessary to further determine that the reason for chimney inlet flue gas baffle door is not turned on, then step is performed
203：The neat stress pressure value before the chimney entrance before chaser is detected, if the neat stress pressure value before the chimney entrance before chaser
In default number range, it is determined that gas baffle door is not as the disturbance of flue gas and closed and generate corresponding second
Signal is sent to DCS system.
It should be noted that referring to the smaller scope near normal value, such as positive normal pressure in default number range
Power is 600Pa, then scope is about 590Pa~610Pa, and this is an example.
If chimney inlet flue gas baffle door is constantly in the state almost closed from start, then from start to chaser
During, neat stress pressure is constantly in higher state, and than opening the neat stress pressure after chimney inlet flue gas baffle door
Power is high.
When January 6 on-load, neat stress pressure is 600Pa.Started shooting after January 12 chaser on-load when (due to will
Gas baffle door is opened and fixed so that be constantly in the state of opening), neat stress pressure is -160Pa.Obvious January 4 opens
During machine, chimney inlet flue gas baffle door is intimate closed mode.By being analyzed above, from start to chaser, flue gas gear
Plate door will not close what is returned because of the disturbance of flue gas.The aperture of chimney inlet flue gas baffle plate is closed mode.
Analyze second of boiler main fuel trip data to can be seen that in the case of former flue gas pressures 6438.2Pa or so, be again started up
Air-introduced machine, risk itself is very big, and correct way should be that the operational factor for checking all devices on DCS pictures is returned to normally
State, while after notifying operations staff's inspection field apparatus running situation, carrying out unit starting.By analyzing DCS data
It can obtain, from 2017-01-12 14:03:54, former flue gas pressures are 6438.2Pa to 2017-01-12 14:25:27, former cigarette
Atmospheric pressure is 193.917Pa, and flue gas pressures reduce 6244.3Pa, and the duration is 22 minutes, it should be pointed out that positive reason
The pressure release of condition lower flue quickly, continue for pressure release in 22 minutes to atmospheric pressure state, be due to the baffle door of chimney position without all
Open.14：20 points, open chimney position baffle door, 5 minutes less than flue pressure with regard to pressure release to normal condition, further confirmation
Chimney baffle door is not turned on causing flue to build the pressure phenomenon.From data as can be seen that during second of boiler startup, flue
Pressure does not drop to atmospheric pressure state also, is just eager to start air-introduced machine, and the running operating point that just result in air-introduced machine is in stall
Region, therefore absolutely prove, after boiler main fuel trip, when starting next time, more than 10 minutes are at least waited, while carrying out live peace
Total inspection works, it is ensured that field apparatus, which is in normal condition, especially valve state, will examine clear, could start next time, keeps away
Exempt from because flue pressure does not drop to atmospheric pressure state, or flue builds the pressure situation, causes air-introduced machine stall flutter boiler
MFT events occur.Performed according to step 204, the default time in step 204 is usually 10 minutes or more
It is long or shorter, depending on being actual conditions.
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention is with Reconstruction in field measure method to certain power plant pot
Stove MFT events conduct in-depth analysis.Maximum difficult point is that chimney inlet flue gas baffle door open and close state is not linked into
DCS system, the reason for causing MFT events for analysis brings very big technical difficulty.By the in-depth analysis of the present invention, draw as follows
Conclusion：
(1) drawn by carrying out Comparative and Quantitative Analysis to air-introduced machine electric current, former flue gas pressures, cause the main of boiler main fuel trip
Reason is that the baffle door at chimney position is not turned on, and causes flue to build the pressure, and air-introduced machine enters stall zone, combustion chamber draft become just and
Significantly rise, boiler furnace pressure height 3 seconds protection acts of delay, boiler main fuel trip tripping operation.
(2) state of chimney position baffle door is linked into DCS system by suggestion power plant, is easy to operations staff to grasp in time and is set
Standby running status, simultaneously under accident condition, can also carry out state estimation；
(3) operating standard of boiler main fuel trip startup is improved in suggestion, and the next startup time at least will be more than 10 minutes, it is ensured that
Flue can normally pressure release, while carrying out site safety inspection work, it is ensured that field apparatus running status is normal, at valve state
In normal condition.
The present invention is directed to the MFT event analysis analyses of causes of certain boiler of power plant, has for the safe and stable operation of other thermal power plants
There are highly important realistic meaning and engineering application value.
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention will be entered with Reconstruction in field measure system below
The detailed description of row.
A kind of boiler main fuel trip key reason analysis provided in an embodiment of the present invention and Reconstruction in field measure system, including：
Baffle door abnormality detection module, for judge chaser leading fan operation electric current and movable vane aperture numerical value whether with
Time gradually increases, if, it is determined that there is exception and performs baffle plate door switch detection module in chimney inlet flue gas baffle door, if
It is no, then terminate；
Baffle plate door switch detection module, chimney is reopened for detecting before chaser after the current value and chaser of air-introduced machine
Current value after inlet flue gas baffle door, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen cigarette
Current value after chimney inlet flue gas baffle door, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door does not have
Have to open and generate corresponding first signal and send to DCS system.
Further, the embodiment of the present invention also includes：
Baffle door closes reason detection module, for detecting the neat stress pressure value before the chimney entrance before chaser, if
The neat stress pressure value before chimney entrance before chaser is in default number range, it is determined that gas baffle door is not as cigarette
The disturbance of gas and close and generate corresponding secondary signal and send to DCS system.
Further, the embodiment of the present invention also includes：
Boiler main fuel trip scene emergency start module, starts for performing boiler main fuel trip, detects the startup time of boiler main fuel trip, if
The startup time reaches the default time, then sends and represent that boiler main fuel trip starts successful 3rd signal to DCS system.
It is apparent to those skilled in the art that, for convenience and simplicity of description, the system of foregoing description,
The specific work process of device and unit, may be referred to the corresponding process in preceding method embodiment, will not be repeated here.
Described above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to before
Embodiment is stated the present invention is described in detail, it will be understood by those within the art that：It still can be to preceding
State the technical scheme described in each embodiment to modify, or equivalent substitution is carried out to which part technical characteristic；And these
Modification is replaced, and the essence of appropriate technical solution is departed from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (6)
1. a kind of boiler main fuel trip key reason analysis and Reconstruction in field measure method, it is characterised in that including：
S1：Judge whether the numerical value of chaser leading fan operation electric current and movable vane aperture gradually increases with the time, if, it is determined that
There is exception and performs step S2 in chimney inlet flue gas baffle door, if it is not, then terminating；
S2：Detection reopens the electric current after chimney inlet flue gas baffle door before chaser after the current value and chaser of air-introduced machine
Value, and judge the current value of the air-introduced machine before chaser whether more than reopening the electricity after chimney inlet flue gas baffle door after chaser
Flow valuve, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door is not turned on and generates corresponding first
Signal is sent to DCS system.
2. a kind of boiler main fuel trip key reason analysis according to claim 1 and Reconstruction in field measure method, its feature exist
In also including after the step S2：
S3：The neat stress pressure value before the chimney entrance before chaser is detected, if the neat stress pressure before the chimney entrance before chaser
Force value is in default number range, it is determined that gas baffle door is not as the disturbance of flue gas and closed and generation is accordingly
Secondary signal is sent to DCS system.
3. a kind of boiler main fuel trip key reason analysis according to claim 2 and Reconstruction in field measure method, its feature exist
In also including after the step S3：
S4：Perform boiler main fuel trip to start, detect the startup time of boiler main fuel trip, if the startup time reaches the default time, send
Represent that boiler main fuel trip starts successful 3rd signal to DCS system.
4. a kind of boiler main fuel trip key reason analysis and Reconstruction in field measure system, it is characterised in that including：
Baffle door abnormality detection module, for judging the numerical value of chaser leading fan operation electric current and movable vane aperture whether with the time
Gradually increase, if, it is determined that there is exception and performs baffle plate door switch detection module in chimney inlet flue gas baffle door, if it is not,
Then terminate；
Baffle plate door switch detection module, chimney entrance is reopened for detecting before chaser after the current value and chaser of air-introduced machine
The current value of gas baffle behind the door, and judge the air-introduced machine before chaser current value whether be more than chaser after reopen chimney and enter
The current value of mouth gas baffle behind the door, if, it is determined that the reason for causing boiler main fuel trip is that chimney inlet flue gas baffle door is not opened
Open and generate corresponding first signal and send to DCS system.
5. a kind of boiler main fuel trip key reason analysis according to claim 4 and Reconstruction in field measure system, its feature exist
In, in addition to：
Baffle door closes reason detection module, for detecting the neat stress pressure value before the chimney entrance before chaser, if chaser
Neat stress pressure value before preceding chimney entrance is in default number range, it is determined that gas baffle door is not as flue gas
Disturbance and close and generate corresponding secondary signal and send to DCS system.
6. a kind of boiler main fuel trip key reason analysis according to claim 5 and Reconstruction in field measure method, its feature exist
In, in addition to：
Boiler main fuel trip scene emergency start module, starts for performing boiler main fuel trip, detects the startup time of boiler main fuel trip, if starting
Time reaches the default time, then sends and represent that boiler main fuel trip starts successful 3rd signal to DCS system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710229291.5A CN106969376B (en) | 2017-04-10 | 2017-04-10 | A kind of analysis of boiler main fuel trip key reason and Reconstruction in field measure method and system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710229291.5A CN106969376B (en) | 2017-04-10 | 2017-04-10 | A kind of analysis of boiler main fuel trip key reason and Reconstruction in field measure method and system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106969376A true CN106969376A (en) | 2017-07-21 |
| CN106969376B CN106969376B (en) | 2019-03-01 |
Family
ID=59336303
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710229291.5A Active CN106969376B (en) | 2017-04-10 | 2017-04-10 | A kind of analysis of boiler main fuel trip key reason and Reconstruction in field measure method and system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106969376B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343679A (en) * | 2020-11-05 | 2021-02-09 | 华能国际电力股份有限公司玉环电厂 | Control method for deep peak shaving and shutdown of unit |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA950075A (en) * | 1971-03-15 | 1974-06-25 | Honeywell Inc. | Delayed fuel and post ignition timed burner control system |
| JP2002013730A (en) * | 2000-06-27 | 2002-01-18 | Babcock Hitachi Kk | Equipment for controlling gas pressure in furnace at emergency stop of boiler |
| CN103574578A (en) * | 2013-10-25 | 2014-02-12 | 广东电网公司电力科学研究院 | Anti-implosion control method for boiler furnace and smoke system in 1045 MW thermal power generating unit by adopting three-in-one induced draft fan |
| CN104033410A (en) * | 2014-05-21 | 2014-09-10 | 国家电网公司 | Induced draught fan and boost fan combined control method for large thermal generator set |
-
2017
- 2017-04-10 CN CN201710229291.5A patent/CN106969376B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CA950075A (en) * | 1971-03-15 | 1974-06-25 | Honeywell Inc. | Delayed fuel and post ignition timed burner control system |
| JP2002013730A (en) * | 2000-06-27 | 2002-01-18 | Babcock Hitachi Kk | Equipment for controlling gas pressure in furnace at emergency stop of boiler |
| CN103574578A (en) * | 2013-10-25 | 2014-02-12 | 广东电网公司电力科学研究院 | Anti-implosion control method for boiler furnace and smoke system in 1045 MW thermal power generating unit by adopting three-in-one induced draft fan |
| CN104033410A (en) * | 2014-05-21 | 2014-09-10 | 国家电网公司 | Induced draught fan and boost fan combined control method for large thermal generator set |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112343679A (en) * | 2020-11-05 | 2021-02-09 | 华能国际电力股份有限公司玉环电厂 | Control method for deep peak shaving and shutdown of unit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106969376B (en) | 2019-03-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104990268B (en) | Fully pre-mixing gas combustion water heater for heating blocks guard method to blast pipe | |
| CN105805040B (en) | The method and stall detecting system of RB are triggered after primary air fan stall | |
| CN103293016B (en) | Based on the combustor fault diagnosis system of DCS system | |
| CN104033410A (en) | Induced draught fan and boost fan combined control method for large thermal generator set | |
| US20150260397A1 (en) | Integrated smoke monitoring and control system for flaring operations | |
| CN109340162A (en) | It prevents fired power generating unit primary air fan stall from tacking and causes flame-out system and method | |
| CN106969376A (en) | A kind of boiler main fuel trip key reason analysis and Reconstruction in field measure method and system | |
| US10018357B2 (en) | Control system and method for biomass power plant | |
| CN111610044B (en) | Method for measuring, evaluating and calculating cooling air volume of dry-type slag extractor | |
| CN106123026A (en) | A kind of thermal power plant coal powder pipeline blocking method for early warning | |
| CN100539346C (en) | Generating set thermal control intelligent protection control method | |
| CN204880205U (en) | Boiler flame detecting system with protection device | |
| CN110146310B (en) | Cold state simulation test method for RB function of induced draft fan | |
| US7930890B2 (en) | Method for protecting the hot gas parts of a gas turbine installation from overheating and for detecting flame extinction in the combustion chamber | |
| CN106288750A (en) | A kind of tobacco cutting combustion furnace gas flow exception verification control method | |
| CN112228893A (en) | Air volume adjusting device and method for draught fan of large power station boiler | |
| CN111855221A (en) | Combustion state monitoring method and system for gas turbine | |
| CN113137766B (en) | Boiler automation control system | |
| CN103279152B (en) | Double cooling protection and control system of intermediate frequency furnace smelting smoke bag-type dust remover | |
| CN115167371B (en) | Reverse verification-based thermal protection fault diagnosis method and system and self-checking method | |
| CN114321872B (en) | Boiler protection method and boiler protection device | |
| CN210774751U (en) | Digital detection platform for steam generator production line | |
| CN208316614U (en) | A kind of excitation system wind pressure monitoring device | |
| CN107013261A (en) | A kind of power load unbalance protection criterion based on rotating speed and power signal | |
| CN115680884A (en) | Elastic purging device and elastic purging method for gas turbine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |