CN107228088A - A kind of pressure fan RB control methods based on blower system status monitoring - Google Patents
A kind of pressure fan RB control methods based on blower system status monitoring Download PDFInfo
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- CN107228088A CN107228088A CN201710397406.1A CN201710397406A CN107228088A CN 107228088 A CN107228088 A CN 107228088A CN 201710397406 A CN201710397406 A CN 201710397406A CN 107228088 A CN107228088 A CN 107228088A
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- pressure fan
- current
- pressure
- unit
- fan
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/008—Stop safety or alarm devices, e.g. stop-and-go control; Disposition of check-valves
-
- 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
- F23N3/00—Regulating air supply or draught
- F23N3/002—Regulating air supply or draught using electronic means
-
- 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
- F23N5/242—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electronic means
Abstract
The present invention relates to a kind of pressure fan RB control methods based on blower system status monitoring, including：According to the situation of change of unit total blast volume, pressure fan outlet pressure and pressure fan current of electric parameter; judge whether occur the unusual service condition that pressure fan does not trip but can not exerted oneself in running; when detecting unusual service condition, a series of triggering supply 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 pressure 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 sending based on blower system status monitoring
Blower 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.Pressure fan is thermal power generation unit wind and smoke
One important auxiliary equipment of system, when pressure fan fault trip, it is necessary to trigger unit RB, the quick reduction power of the assembling unit is defeated
Go out, ensure that unit wind coal proportion is suitable as far as possible.
In the prior art, triggering unit blasting air machine RB condition is tripped for pressure fan and the power of the assembling unit is exerted oneself more than 50% volume
Constant load.However, when occurring, ajutage is damaged, connecting rod comes off or during the failure such as shaft coupling fracture between pressure fan and motor, and this send
Blower fan is not exerted oneself substantially to boiler supply air system, but because pressure fan does not trip, it is impossible to reach triggering unit RB condition, nothing
Method realizes the urgent load down of unit automatically, has 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 pressure fan system
The pressure fan RB control methods of system status monitoring.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of pressure fan RB control methods based on blower system status monitoring, including：According to unit total blast volume, air-supply
Machine outlet pressure and pressure fan current of electric situation of change, judge that whether occurring pressure fan in running does not trip but can not go out
The unusual service condition of power, when detecting unusual service condition, a series of triggering supply air system exception RB, and carry out protection acts in time,
Unit fast cutback is realized, the safe and stable operation of unit is maintained.
The detection of described supply air system unusual service condition is specially：When unit bringing normally into operation and two pressure fan operations,
Unit total blast volume, pressure fan outlet pressure and pressure fan current of electric situation of change are detected, to judge and trigger supply air system different
Normal RB.
Described judgement and triggering supply air system exception RB are specially：
1) pressure fan current of electric bust to idle electric current or two pressure fan current of electric deviations is more than 15% specified electricity
Stream, and total blast volume is less than alarming value, is delayed 3 seconds, the low pressure fan of direct tripping current, triggering supply air system exception RB；
2) total blast volume is less than trip value, postpones 3 seconds, and shunt tripping outlet pressure and current of electric low pressure fan, triggering are sent
Wind system exception RB.
When the bad quality of any pressure fan motor current signal, if " two pressure fan outlet pressure deviations are more than 10% volume
Constant-pressure, and total blast volume is less than alarming value, is delayed 3 seconds ", the low pressure fan of direct tripping current, triggering supply air system exception RB.
During the bad quality of pressure fan current of electric, the low pressure fan of tripping operation outlet pressure.
Described alarming value air quantity uses the wind coal limit value air quantity of unit current combustion coal amount, described trip value air quantity by
The corresponding minimum flammable air quantity definite value of currently boiler combustion coal amount increases the biasing of setting to determine.
A series of described protection acts of carry out are specially：
1) when unit load is more than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, according to setting order with 5s intervals tripping operation coal-grinding
Machine, it is final to retain 3 coal pulverizer operations；
B) the normal operation pressure fan of override control increase and air-introduced machine movable vane aperture, increase blower fan are exerted oneself, override control knot
Air quantity is put into after beam and furnace pressure is automatically controlled；
C) boiler master output is set as 50% boiler load.
2) when unit load is less than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, override control increase is normal to be run pressure fan and draws
Wind motor leaf aperture, increase blower fan is exerted oneself, and input air quantity and furnace pressure are automatically controlled after override control terminates；
B) total coal-supplying amount correspondence boiler load of coal pulverizer is run after boiler master output tracking RB.
Compared with prior art, the present invention becomes according to unit total blast volume, pressure fan outlet pressure and pressure fan current of electric
Change situation, judges whether to occur in running that supply air system airduct is damaged, pressure fan connecting rod comes off or shaft coupling fracture is sent
Wind system unusual service condition, when detecting unusual service condition, a series of triggering supply air system exception RB, and it is dynamic to carry out protections in time
Make, realize 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, according to unit total blast volume, pressure fan outlet pressure and pressure fan current of electric situation of change, judging
Occur the supply air system unusual service condition that pressure fan does not trip but can not exerted oneself in running, when detecting unusual service condition, and
When trigger supply air system exception RB, and carry out a series of protection acts, realize unit fast cutback, maintain the safety of unit surely
Fixed operation：
When unit bringing normally into operation and two pressure fan operations, detection unit total blast volume, pressure fan outlet pressure and air-supply
Electromechanical machine curent change situation, judges and triggers supply air system exception RB as follows：
1) near pressure fan current of electric bust to idle electric current or two pressure fan current of electric deviations are more than 15% volume
Determine electric current and (when the bad quality of any pressure fan motor current signal, be more than 10% volume using two pressure fan outlet pressure deviations
Constant-pressure is judged), and total blast volume is less than alarming value, is delayed 3 seconds, the direct low pressure fan of tripping current (pressure fan motor electricity
When flowing bad quality, the low pressure fan of tripping operation outlet pressure), triggering supply air system exception RB；
2) total blast volume is less than trip value, postpones 3 seconds, shunt tripping outlet pressure and the low pressure fan of current of electric, triggering air-supply
System exception RB；
3) alarm air quantity uses the wind coal limit value air quantity of unit current combustion coal amount in above-mentioned two, and tripping operation air quantity is by current
The corresponding minimum flammable air quantity definite value of boiler combustion coal amount increases certain biasing to determine.
Situation is acted after supply air system exception RB triggerings：
1) when unit load is more than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, according to setting order with 5s intervals tripping operation coal-grinding
Machine, it is final to retain 3 coal pulverizer operations；
B) the normal operation pressure fan of override increase and air-introduced machine movable vane aperture, increase blower fan are exerted oneself, and override is put into after terminating
Air quantity and furnace pressure are automatically controlled；
C) boiler master output is set as 50% boiler load.
2) when unit load is less than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, the normal operation pressure fan of override increase and air-introduced machine
Movable vane aperture, increase blower fan is exerted oneself, and input air quantity and furnace pressure are automatically controlled after override terminates；
B) total coal-supplying amount correspondence boiler load of coal pulverizer is run after boiler master output tracking RB.
Specific embodiment
Certain 660MW unit blasting air machine system exception RB is implemented：
1) there is wind coal intersection limit value in unit, and wherein coal amount is real for current unit to the limit value and minimum flammable air quantity of air quantity
The functional relation y of border burning coal amounta=f (xcoal), yb=f (xcoal), wherein yaFor limit value of the coal amount to air quantity；ybFor most I
Fire air quantity.The alarm air quantity for fetching and delivering blower fan system exception RB is ya, tripping operation air quantity is yb+100.Coal pulverizer tripping operation order is set as
F-E-D-C-B；
2) according to total blast volume, pressure fan outlet pressure and pressure fan current of electric situation of change, as follows judge and
Trigger supply air system exception RB：
A) pressure fan electric current bust is more than 17A (when appointing to idle electric current 45A or so or two pressure fan current of electric deviations
During the bad quality of one pressure fan motor current signal, it is more than 0.5kPa using two pressure fan outlet pressure deviations), and total blast volume is low
In alarm air quantity, it is delayed 3 seconds, (during the bad quality of pressure fan current of electric, tripping operation outlet pressure is low for the direct low pressure fan of tripping current
Pressure fan), triggering supply air system exception RB；
B) total blast volume is less than trip value, 3 seconds shunt tripping outlet pressures of delay and the low pressure fan logic of electric current, triggering air-supply system
Exception of uniting RB；
Situation is acted after supply air system exception RB triggerings：
1) when unit load is more than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, according to setting order with 5s intervals tripping operation coal-grinding
Machine, finally retains 3 layers of bisque；
B) the normal operation pressure fan of override increase and air-introduced machine movable vane aperture are to 90%, and increase blower fan is exerted oneself, after override 2s
Input air quantity and furnace pressure are automatically controlled；
C) boiler master is output as 50% boiler load.
A) when unit load is less than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, the normal operation pressure fan of override increase and air-introduced machine
Movable vane aperture is to 90%, and increase blower fan is exerted oneself, and air quantity is put into after override 2s and is automatically controlled；
B) the corresponding boiler load of total coal-supplying amount of coal pulverizer is run after boiler master output tracking RB.
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 (7)
1. a kind of pressure fan RB control methods based on blower system status monitoring, it is characterised in that including：It is total according to unit
Air quantity, pressure fan outlet pressure and pressure fan current of electric situation of change, judge that whether occurring pressure fan in running does not jump
Lock but the unusual service condition that can not be exerted oneself, when detecting unusual service condition, triggering supply air system exception RB, and carrying out a series of in time
Protection act, realizes unit fast cutback, maintains the safe and stable operation of unit.
2. a kind of pressure fan RB control methods based on blower system status monitoring according to claim 1, its feature
It is, the detection of described supply air system unusual service condition is specially：When unit bringing normally into operation and two pressure fan operations, detection
Unit total blast volume, pressure fan outlet pressure and pressure fan current of electric situation of change, to judge and trigger supply air system exception RB.
3. a kind of pressure fan RB control methods based on blower system status monitoring according to claim 2, its feature
It is, described judgement and triggering supply air system exception RB is specially：
1) pressure fan current of electric bust to idle electric current or two pressure fan current of electric deviations is more than 15% rated current, and
Total blast volume is less than alarming value, is delayed 3 seconds, the low pressure fan of direct tripping current, triggering supply air system exception RB；
2) total blast volume is less than trip value, postpones 3 seconds, shunt tripping outlet pressure and current of electric low pressure fan, triggering air-supply system
Exception of uniting RB.
4. a kind of pressure fan RB control methods based on blower system status monitoring according to claim 3, its feature
It is, when the bad quality of any pressure fan motor current signal, if " two pressure fan outlet pressure deviations are more than 10% specified pressure
Power, and total blast volume is less than alarming value, is delayed 3 seconds ", the low pressure fan of direct tripping current, triggering supply air system exception RB.
5. a kind of pressure fan RB control methods based on blower system status monitoring according to claim 3, its feature
It is, during the bad quality of pressure fan current of electric, the low pressure fan of tripping operation outlet pressure.
6. a kind of pressure fan RB control methods based on blower system status monitoring according to claim 3, its feature
It is, described alarming value air quantity uses the wind coal limit value air quantity of unit current combustion coal amount, and described trip value air quantity is by working as
The biasing of the corresponding minimum flammable air quantity definite value increase setting of preceding boiler combustion coal amount is determined.
7. a kind of pressure fan RB control methods based on blower system status monitoring according to claim 1, its feature
It is, a series of described protection acts of carry out are specially：
1) when unit load is more than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, are tripped coal pulverizer, most according to setting order with 5s intervals
Retain 3 coal pulverizer operations eventually；
B) the normal operation pressure fan of override control increase and air-introduced machine movable vane aperture, increase blower fan is exerted oneself, after override control terminates
Input air quantity and furnace pressure are automatically controlled；
C) boiler master output is set as 50% boiler load.
2) when unit load is less than 50% rated load before RB triggerings：
A) pressure fan and homonymy air-introduced machine for the abnormal supply air system that trips, the normal operation pressure fan of override control increase and air-introduced machine
Movable vane aperture, increase blower fan is exerted oneself, and input air quantity and furnace pressure are automatically controlled after override control terminates；
B) total coal-supplying amount correspondence boiler load of coal pulverizer is run after boiler master output tracking RB.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN110242978A (en) * | 2019-06-14 | 2019-09-17 | 中国神华能源股份有限公司 | The method for controlling frequency conversion and device of fired power generating unit pressure fan |
| CN110388655A (en) * | 2019-07-05 | 2019-10-29 | 华北电力科学研究院有限责任公司 | Boiler biserial blower fan single side progress control method and device |
| CN112628711A (en) * | 2021-01-11 | 2021-04-09 | 大唐黄岛发电有限责任公司 | Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load |
| CN112902221A (en) * | 2021-03-16 | 2021-06-04 | 西安热工研究院有限公司 | Interlocking protection control system of coal-fired unit |
| CN112923393A (en) * | 2021-03-31 | 2021-06-08 | 西安热工研究院有限公司 | Induced draft fan guide vane control system and method in auxiliary machine fault load reduction process |
| CN114881375A (en) * | 2022-07-11 | 2022-08-09 | 浙江科维节能技术股份有限公司 | Diagnosis and tuning system and method of fan system |
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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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| CN110388655A (en) * | 2019-07-05 | 2019-10-29 | 华北电力科学研究院有限责任公司 | Boiler biserial blower fan single side progress control method and device |
| CN112628711A (en) * | 2021-01-11 | 2021-04-09 | 大唐黄岛发电有限责任公司 | Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load |
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| CN112923393A (en) * | 2021-03-31 | 2021-06-08 | 西安热工研究院有限公司 | Induced draft fan guide vane control system and method in auxiliary machine fault load reduction process |
| CN114881375A (en) * | 2022-07-11 | 2022-08-09 | 浙江科维节能技术股份有限公司 | Diagnosis and tuning system and method of fan system |
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