CN107255268A - A kind of primary air fan RB control methods based on primary air fan system state monitoring - Google Patents
A kind of primary air fan RB control methods based on primary air fan system state monitoring Download PDFInfo
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- CN107255268A CN107255268A CN201710397403.8A CN201710397403A CN107255268A CN 107255268 A CN107255268 A CN 107255268A CN 201710397403 A CN201710397403 A CN 201710397403A CN 107255268 A CN107255268 A CN 107255268A
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- primary air
- air fan
- pressure
- tripping operation
- coal pulverizer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B35/00—Control systems for steam boilers
-
- 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
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Disintegrating Or Milling (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The present invention relates to a kind of primary air fan RB control methods based on primary air fan system state monitoring, including：According to primary air fan main-piping pressure, primary air fan outlet pressure and primary air fan current of electric situation of change; judge whether occur the unusual service condition that primary air fan does not trip but can not exerted oneself in running; when detecting unusual service condition; a series of triggering primary air system exception RB, and carry out protection acts in time.Compared with prior art, the present invention has judges the unusual service condition that blower fan can not exert oneself when primary air fan does not trip in time, and realizes unit fast cutback, the advantages of maintaining the safe and stable operation of unit.
Description
Technical field
The present invention relates to thermal technics and protection, more particularly, to a kind of based on primary air fan system state monitoring
Primary air fan RB control methods.
Background technology
RB (RUNBACK) in thermal power generation unit refers to that unit major pant item fault trip causes unit output to be limited
When processed, exerted oneself to adapt to equipment, maintain unit safety stable operation, control system forces unit load reducing to auxiliary still in operation
The load desired value that machine can bear, this function is otherwise known as runback.
Primary air fan is an important auxiliary equipment of thermal power generation unit air and flue system, when primary air fan fault trip
When, it is necessary to trigger unit RB.When primary air fan RB occurs for conventional fired power generating unit, can put into operation feelings according to input combustion system at that time
Condition, carries out coal seam tripping operation according to the order of setting and cuts off, retain untill the coal seam number of plies of setting, during the interval of its coal seam excision
Between be typically set to 3-10 seconds, reduce leakage of the First air from coal pulverizer, as far as possible ensure First air main-piping pressure.
In the prior art, triggering unit primary air fan RB condition is tripped for primary air fan and the power of the assembling unit is exerted oneself and is more than
50% rated load.However, when occur primary air piping damage, between primary air fan and motor connecting rod come off or shaft coupling fracture etc. therefore
During barrier, the primary air fan is not exerted oneself substantially to primary air system, but because primary air fan does not trip, it is impossible to reach triggering unit
RB condition, it is impossible to realize the urgent load down of unit automatically, have a strong impact on safe and stable operation of the unit under the operating mode.
The content of the invention
It is an object of the present invention to overcome the above-mentioned drawbacks of the prior art and provide one kind is based on primary air fan
The primary air fan RB control methods of system state monitoring.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of primary air fan RB control methods based on primary air fan system state monitoring, including：It is female according to primary air fan
Pipe pressure, primary air fan outlet pressure and primary air fan current of electric situation of change, judge whether occur once in running
The primary air system unusual service condition that blower fan does not trip but can not exerted oneself, when detecting unusual service condition, triggers First air system in time
Unite exception RB, and carries out a series of protection acts, realizes unit fast cutback, maintains the safe and stable operation of unit.
Described primary air system unusual service condition detection process is as follows：
When coal pulverizer machine operation number of units is more than or equal to 2 and two primary air fan operations, primary air fan main pipe pressure is detected
Power, primary air fan outlet pressure and blower motor curent change situation, to judge and trigger primary air system exception RB.
Described judgement and triggering primary air system exception RB is specific as follows：
1) primary air fan current of electric bust to idle electric current or two primary air fan current of electric deviations is more than 15% volume
Determine electric current, and primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds, the low primary air fan of direct tripping current, triggering is once
Wind system exception RB；
2) primary air fan main-piping pressure is less than tripping operation pressure, and 3 seconds shunt tripping outlet pressures of delay and current of electric are low by one
Secondary blower fan, triggering primary air system exception RB.
When the bad quality of any primary air fan motor current signal, " two primary air fan outlet pressure deviations are more than for use
10% rated pressure, and primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds " judged.
During the bad quality of primary air fan current of electric, the low primary air fan of tripping operation outlet pressure.
Described alarm duty pressure uses the low alarming value of unit First air main-piping pressure, and described tripping operation pressure is by First air
The definite value increase setting biasing of the low tripping operation pulverized coal preparation system of main-piping pressure is determined.
A series of described protection acts of carry out
1) when unit load is more than 50% rated load before RB triggerings：
1a) the primary air fan of the abnormal primary air system of tripping operation, it is final to protect according to setting order with 3s intervals tripping operation coal pulverizer
3 coal pulverizer operations are stayed, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
1b) complete after coal pulverizer tripping operation, if primary air fan outlet main-piping pressure continues less than tripping operation pressure, by setting in 10s
Fixed order continues the coal pulverizer that trips, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
1c) continue executing with step 1b), until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation and pressed
Untill power；
2) when unit load is less than 50% rated load before RB triggerings：
2a) the primary air fan of the abnormal primary air system of tripping operation, if the interior First air main-piping pressures of 10s are still after primary air fan tripping operation
Less than tripping operation pressure, then by setting order one coal pulverizer of tripping operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
2b) coal pulverizer tripping operation after, if in 10s primary air fan main-piping pressure continue less than tripping operation pressure, by setting order after
One coal pulverizer of continuous tripping operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal.
2c) continue executing with step 2b), until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation and pressed
Untill power；
3) during primary air system exception RB, total coal-supplying amount of unit boiler master control output tracking residue operation coal pulverizer
Corresponding boiler load.
During described coal pulverizer tripping operation, after only remaining 3 coal pulverizers operation, start unit fuel oil it is combustion-supporting or wait from
Sub- arcing is combustion-supporting.
Compared with prior art, the present invention is according to primary air fan main-piping pressure, primary air fan outlet pressure and primary air fan
Current of electric situation of change, judges it is unusual service condition that primary air fan does not trip but can not exerted oneself in running, when detecting
During unusual service condition, a series of triggering primary air system exception RB, and carry out protection acts in time realizes unit fast cutback,
Maintain the safe and stable operation of unit.
Brief description of the drawings
Fig. 1 is flow chart of the invention.
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 a part of embodiment of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, the every other reality that those of ordinary skill in the art are obtained on the premise of creative work is not made
Example is applied, should all belong to the scope of protection of the invention.
As shown in figure 1, the present invention is according to primary air fan main-piping pressure, primary air fan outlet pressure and primary air fan motor electricity
Situation of change is flowed, judges occur the unusual service condition that primary air fan does not trip but can not exerted oneself in running, when detecting exception
During operating mode, a series of triggering primary air system exception RB, and carry out protection acts in time realizes unit fast cutback, maintains
The safe and stable operation of unit)：
When coal pulverizer machine operation number of units is more than or equal to 2 and two primary air fan operations, primary air fan main pipe pressure is detected
Power, primary air fan outlet pressure and blower motor curent change situation, judge and trigger primary air system exception as follows
RB：
1) near primary air fan current of electric bust to idle electric current or two primary air fan current of electric deviations are more than
15% rated current (when the bad quality of any primary air fan motor current signal, uses two primary air fan outlet pressure deviations
Judged more than 10% rated pressure), and primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds, direct tripping current is low
Primary air fan (during the bad quality of primary air fan current of electric, the low primary air fan of tripping operation outlet pressure), triggering primary air system is different
Normal RB；
2) primary air fan main-piping pressure less than tripping operation pressure, delay 3 seconds shunt tripping outlet pressures and current of electric it is low once
Blower fan, triggering primary air system exception RB；
3) above-mentioned two middle alarm pressures can use the low alarming value of unit First air main-piping pressure, and tripping operation pressure is by First air
The certain biasing of definite value increase of the low tripping operation pulverized coal preparation system of main-piping pressure is determined.
Situation is acted after primary air system exception RB triggerings：
1) when unit load is more than 50% rated load before RB triggerings：
A) primary air fan of the abnormal primary air system of tripping operation, it is final to protect according to setting order with 3s intervals tripping operation coal pulverizer
3 coal pulverizer operations are stayed, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
B) complete after coal pulverizer tripping operation, primary air fan outlet main-piping pressure continues less than tripping operation pressure, by setting in such as 10s
Order continues the coal pulverizer that trips, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal.
C) step b) is continued executing with, until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Untill.After only remaining 3 coal pulverizers operation, startup unit fuel oil is combustion-supporting or plasma arcing is combustion-supporting；
2) when unit load is less than 50% rated load before RB triggerings：
A) trip the primary air fan of abnormal primary air system, after primary air fan tripping operation in 10s such as First air main-piping pressure still
Less than tripping operation pressure, then by setting order one coal pulverizer of tripping operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
B) after coal pulverizer tripping operation, primary air fan main-piping pressure continues, less than tripping operation pressure, by setting order to continue in such as 10s
Trip a coal pulverizer, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal.
C) step b) is continued executing with, until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Untill.After coal pulverizer operation number of units is less than or equal to 3 platform, startup unit fuel oil is combustion-supporting or plasma arcing is combustion-supporting；
3) during primary air system exception RB, total coal-supplying amount of unit boiler master control output tracking residue operation coal pulverizer
Corresponding boiler load；
Specific embodiment
Primary air fan system exception RB is implemented in certain 660MW units full load section：
1) unit primary air fan main-piping pressure alarming value is set as 7kPa, and trip value settings are 6.3kPa, coal pulverizer tripping operation
Order is set as F-E-D-C-B；
2) primary air fan main-piping pressure, primary air fan outlet pressure and blower motor curent change situation, as follows
Judge and triggering primary air system exception RB：
A) primary air fan electric current bust is more than 17A to idle electric current 42A or so or two primary air fan current of electric deviations
(when the bad quality of any primary air fan motor current signal, carried out using two primary air fan outlet pressure deviations more than 1kPa
Judge), and primary air fan main-piping pressure is less than 7kPa, is delayed 3 seconds, the direct low primary air fan of tripping current (primary air fan motor
During the bad quality of electric current, the low primary air fan of tripping operation outlet pressure), triggering primary air system exception RB；
B) primary air fan main-piping pressure is less than 6.3kPa, 3 seconds shunt tripping outlet pressures of delay and the low First air of current of electric
Machine, triggering primary air system exception RB；
3) after primary air fan exception RB triggerings：
Unit load is more than 50% rated load before 3-1) being triggered such as RB:
A) primary air fan of the abnormal primary air system of tripping operation, according to F-E-D-C-B order with 3s intervals tripping operation coal pulverizer,
Final to retain 3 layers of coal pulverizer operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
B) complete after coal pulverizer tripping operation, primary air fan outlet main-piping pressure continues to be less than 6.3kPa in such as 10s, suitable by setting
Sequence continues the coal pulverizer that trips, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
C) it is continuous to perform step b), until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Only.After only remaining 3 coal pulverizers operation, startup unit fuel oil is combustion-supporting or plasma arcing is combustion-supporting；
Unit load is less than 50% rated load before 3-2) being triggered such as RB:
A) trip the primary air fan of abnormal primary air system, after primary air fan tripping operation in 10s such as First air main-piping pressure still
Less than tripping operation pressure, then by setting order one coal pulverizer of tripping operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
B) after coal pulverizer tripping operation, primary air fan outlet main-piping pressure continues less than tripping operation pressure, by setting order in such as 10s
Continue the coal pulverizer that trips, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal.
C) step b) is continued executing with, until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Untill.After only remaining 3 coal pulverizers operation, startup unit fuel oil is combustion-supporting or plasma arcing is combustion-supporting；
3-3) during primary air system exception RB, the total of unit boiler master control output tracking residue operation coal pulverizer gives coal
Measure corresponding boiler load.
The foregoing is only a specific embodiment of the invention, but protection scope of the present invention is not limited thereto, any
Those familiar with the art the invention discloses technical scope in, various equivalent modifications can be readily occurred in or replaced
Change, these modifications or substitutions should be all included within the scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection domain be defined.
Claims (8)
1. a kind of primary air fan RB control methods based on primary air fan system state monitoring, it is characterised in that including：According to one
Secondary blower fan main-piping pressure, primary air fan outlet pressure and primary air fan current of electric situation of change, judge in running whether
There is the primary air system unusual service condition that primary air fan does not trip but can not exerted oneself, when detecting unusual service condition, triggering in time
Primary air system exception RB, and a series of protection acts are carried out, unit fast cutback is realized, the safety and stability fortune of unit is maintained
OK.
2. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 1, its
It is characterised by, described primary air system unusual service condition detection process is as follows：
When coal pulverizer machine operation number of units is more than or equal to 2 and two primary air fan operations, detection primary air fan main-piping pressure, one
Secondary fan outlet pressure and blower motor curent change situation, to judge and trigger primary air system exception RB.
3. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 2, its
It is characterised by, described judgement and triggering primary air system exception RB is specific as follows：
1) primary air fan current of electric bust to idle electric current or two primary air fan current of electric deviations is more than 15% specified electricity
Stream, and primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds, the low primary air fan of direct tripping current, triggering First air system
Exception of uniting RB；
2) primary air fan main-piping pressure is less than tripping operation pressure, 3 seconds shunt tripping outlet pressures of delay and current of electric low First air
Machine, triggering primary air system exception RB.
4. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 3, its
It is characterised by, when the bad quality of any primary air fan motor current signal, " two primary air fan outlet pressure deviations are more than for use
10% rated pressure, and primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds " judged.
5. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 3, its
It is characterised by, during the bad quality of primary air fan current of electric, the low primary air fan of tripping operation outlet pressure.
6. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 3, its
It is characterised by, described alarm duty pressure uses the low alarming value of unit First air main-piping pressure, and described tripping operation pressure is by once
The definite value increase setting biasing of the low tripping operation pulverized coal preparation system of wind main-piping pressure is determined.
7. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 1, its
It is characterised by, a series of described protection acts of carry out
1) when unit load is more than 50% rated load before RB triggerings：
1a) the primary air fan of the abnormal primary air system of tripping operation, according to setting order with 3s intervals tripping operation coal pulverizer, finally retains 3
Platform coal pulverizer is run, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
1b) complete after coal pulverizer tripping operation, it is suitable by setting if primary air fan outlet main-piping pressure continues less than tripping operation pressure in 10s
Sequence continues the coal pulverizer that trips, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
1c) continue executing with step 1b), until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Only；
2) when unit load is less than 50% rated load before RB triggerings：
2a) the primary air fan of the abnormal primary air system of tripping operation, if First air main-piping pressure is still below in 10s after primary air fan tripping operation
Trip pressure, then by setting order one coal pulverizer of tripping operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
2b) after coal pulverizer tripping operation, if primary air fan main-piping pressure continues less than tripping operation pressure in 10s, continue to jump by setting order
One coal pulverizer of lock, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal.
2c) continue executing with step 2b), until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Only；
3) during primary air system exception RB, total coal-supplying amount correspondence of unit boiler master control output tracking residue operation coal pulverizer
Boiler load.
8. a kind of primary air fan RB control methods based on primary air fan system state monitoring according to claim 1, its
It is characterised by, during described coal pulverizer tripping operation, after only remaining 3 coal pulverizers operation, startup unit fuel oil is combustion-supporting or waits
Ion arcing is combustion-supporting.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108644804A (en) * | 2018-03-30 | 2018-10-12 | 大唐阳城发电有限责任公司 | It is a kind of for the First air low-voltage variation system of pulverized-coal fired boiler and guard method |
| CN109340162A (en) * | 2018-11-26 | 2019-02-15 | 贵州金元茶园发电有限责任公司 | It prevents fired power generating unit primary air fan stall from tacking and causes flame-out system and method |
| CN110146310A (en) * | 2018-02-13 | 2019-08-20 | 上海明华电力技术工程有限公司 | Send air-introduced machine RB function cold-simulation test method |
| CN111287914A (en) * | 2020-03-24 | 2020-06-16 | 大唐贵州发耳发电有限公司 | Fan monitoring device and method |
| CN112657665A (en) * | 2020-12-04 | 2021-04-16 | 浙江浙能技术研究院有限公司 | Control method for preventing and coping with fan stall in RB process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110146310A (en) * | 2018-02-13 | 2019-08-20 | 上海明华电力技术工程有限公司 | Send air-introduced machine RB function cold-simulation test method |
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| CN112657665A (en) * | 2020-12-04 | 2021-04-16 | 浙江浙能技术研究院有限公司 | Control method for preventing and coping with fan stall in RB process |
| CN112657665B (en) * | 2020-12-04 | 2022-02-11 | 浙江浙能技术研究院有限公司 | Control method for preventing and coping with fan stall in RB process |
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