CN107228088B - A kind of pressure fan RB control method based on blower system status monitoring - Google Patents
A kind of pressure fan RB control method based on blower system status monitoring Download PDFInfo
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- CN107228088B CN107228088B CN201710397406.1A CN201710397406A CN107228088B CN 107228088 B CN107228088 B CN 107228088B CN 201710397406 A CN201710397406 A CN 201710397406A CN 107228088 B CN107228088 B CN 107228088B
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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
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Regulation And Control Of Combustion (AREA)
Abstract
The pressure fan RB control method based on blower system status monitoring that the present invention relates to a kind of; it include: the situation of change according to 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 contribute in operational process; when detecting unusual service condition; triggering supply air system exception RB in time, and carry out a series of protection acts.Compared with prior art, the advantages that present invention is with judging the unusual service condition that blower can not contribute in time when pressure fan does not trip, and realizing unit fast cutback, maintain the safe and stable operation of unit.
Description
Technical field
The present invention relates to thermal technics and protections, more particularly, to a kind of sending based on blower system status monitoring
Blower RB control method.
Background technique
RB (RUNBACK) in thermal power generation unit refers to that unit major pant item fault trip causes unit output to be limited
When processed, to adapt to equipment power output, unit safety stable operation is maintained, control system forces to reduce to unit load still auxiliary in operation
The load target value that machine can bear, this function are otherwise known as runback.Pressure fan is thermal power generation unit wind and smoke
One important ancillary equipment of system needs to trigger unit RB when pressure fan fault trip, and it is defeated quickly to reduce the power of the assembling unit
Out, guarantee that unit wind coal proportion is suitable as far as possible.
In the prior art, the condition for triggering unit blasting air machine RB is that pressure fan trips and power of the assembling unit power output is greater than 50% volume
Constant load.However, this send when there are the failures such as air supply tube damages, connecting rod falls off between pressure fan and motor or shaft coupling is broken
Blower does not contribute substantially to boiler supply air system, but since pressure fan does not trip, and is unable to reach the condition of triggering unit RB, nothing
Method realizes the urgent load down of unit automatically, seriously affects safe and stable operation of the unit under the operating condition.
Summary 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 to be based on pressure fan system
The pressure fan RB control method 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 method based on blower system status monitoring, comprising: 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 operational process does not trip but can not go out
The unusual service condition of power triggers supply air system exception RB, and carry out a series of protection acts when detecting unusual service condition in time,
It realizes unit fast cutback, maintains the safe and stable operation of unit.
The detection of the supply air system unusual service condition specifically: 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, it is different to judge and trigger supply air system
Normal RB.
The judgement and triggering supply air system exception RB specifically:
1) pressure fan current of electric bust to idle electric current or two pressure fan current of electric deviations is greater than 15% specified electricity
Stream, and total blast volume is lower than alarming value, is delayed 3 seconds, the low pressure fan of direct tripping current triggers supply air system exception RB；
2) total blast volume is lower than trip value, postpones 3 seconds, and shunt tripping outlet pressure and the low pressure fan of current of electric, 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 greater than 10% volume
Constant-pressure, and total blast volume is lower than alarming value, is delayed 3 seconds ", the low pressure fan of direct tripping current triggers supply air system exception RB.
When the bad quality of pressure fan current of electric, the low pressure fan of tripping outlet pressure.
The alarming value air quantity use unit current combustion coal amount wind coal limit value air quantity, the trip value air quantity by
Air quantity definite value that the corresponding minimum of currently boiler combustion coal amount is flammable increases the biasing of setting to determine.
A series of protection acts of carry out specifically:
1) when unit load is greater than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, according to setting sequence with the interval 5s tripping coal-grinding
Machine, it is final to retain 3 coal pulverizer operations；
B) override control, which increases, operates normally pressure fan and air-introduced machine movable vane aperture, increases blower power output, override control knot
Air quantity is put into after beam and furnace pressure automatically controls；
C) boiler master output is set as 50% boiler load.
2) when unit load is less than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, override control, which increases, to be operated normally pressure fan and draws
Wind motor leaf aperture, increases blower power output, and air quantity is put into after override control and furnace pressure automatically controls；
B) total coal-supplying amount that coal pulverizer is run after boiler master output tracking RB corresponds to boiler load.
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 occur the damage of supply air system air hose in operational process, pressure fan connecting rod falls off or what shaft coupling was broken send
Wind system unusual service condition triggers supply air system exception RB when detecting unusual service condition in time, and it is dynamic to carry out a series of protections
Make, realizes unit fast cutback, maintain the safe and stable operation of unit.
Detailed description of the invention
Fig. 1 is flow chart of the invention.
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is a part of the embodiments of the present invention, rather than whole embodiments.Based on this hair
Embodiment in bright, those of ordinary skill in the art's every other reality obtained without making creative work
Example is applied, all should 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, judgement
Occur the supply air system unusual service condition that pressure fan does not trip but can not contribute in operational process, 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 steady
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 as follows and triggers supply air system exception RB:
1) near pressure fan current of electric bust to idle electric current or two pressure fan current of electric deviations are greater than 15% volume
Constant current (when the bad quality of any pressure fan motor current signal, is greater than 10% volume using two pressure fan outlet pressure deviations
Constant-pressure is judged), and total blast volume is lower than alarming value, is delayed 3 seconds, the low pressure fan of direct tripping current (pressure fan motor electricity
When flowing bad quality, the low pressure fan of tripping outlet pressure), trigger supply air system exception RB；
2) total blast volume is lower 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 the air quantity that trips is by current
The corresponding minimum of boiler combustion coal amount is flammable, and air quantity definite value increases certain biasing to determine.
Action situation after supply air system exception RB triggering:
1) when unit load is greater than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, according to setting sequence with the interval 5s tripping coal-grinding
Machine, it is final to retain 3 coal pulverizer operations；
B) override, which increases, operates normally pressure fan and air-introduced machine movable vane aperture, increases blower power output, puts into after override
Air quantity and furnace pressure automatically control；
C) boiler master output is set as 50% boiler load.
2) when unit load is less than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, override, which increases, operates normally pressure fan and air-introduced machine
Movable vane aperture increases blower power output, and air quantity is put into after override and furnace pressure automatically controls；
B) total coal-supplying amount that coal pulverizer is run after boiler master output tracking RB corresponds to boiler load.
Specific embodiment
Certain 660MW unit blasting air machine system exception RB is implemented:
1) there are wind coals to intersect limit value for unit, and wherein coal amount is that current unit is real to the limit value of air quantity and minimum flammable air quantity
The functional relation y of border burning coal amounta=f (xcoal), yb=f (xcoal), wherein yaIt is coal amount to the limit value of air quantity；ybIt can for minimum
Fire air quantity.The alarm air quantity for fetching and delivering blower fan system exception RB is ya, tripping air quantity is yb+100.Coal pulverizer tripping sequence 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 judgement and
Trigger supply air system exception RB:
A) pressure fan electric current bust is greater than 17A (when appointing to idle electric current 45A or so or two pressure fan current of electric deviations
When the bad quality of one pressure fan motor current signal, it is greater than 0.5kPa using two pressure fan outlet pressure deviations), and total blast volume is low
It in alarm air quantity, is delayed 3 seconds, (when the bad quality of pressure fan current of electric, tripping outlet pressure is low for the low pressure fan of direct tripping current
Pressure fan), trigger supply air system exception RB；
B) total blast volume is lower than trip value, postpones the low pressure fan logic of 3 seconds shunt tripping outlet pressures and electric current, triggering air-supply system
Unite exception RB；
Action situation after supply air system exception RB triggering:
1) when unit load is greater than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, according to setting sequence with the interval 5s tripping coal-grinding
Machine finally retains 3 layers of bisque；
B) override, which increases, operates normally pressure fan and air-introduced machine movable vane aperture to 90%, increases blower and contributes, after override 2s
It puts into air quantity and furnace pressure automatically controls；
C) boiler master output is 50% boiler load.
A) when unit load is less than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, override, which increases, operates normally pressure fan and air-introduced machine
Movable vane aperture increases blower power output, investment air quantity automatically controls after override 2s to 90%；
B) the corresponding boiler load of total coal-supplying amount of coal pulverizer is run after boiler master output tracking RB.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can readily occur in various equivalent modifications or replace
It changes, these modifications or substitutions should be covered by the protection scope of the present invention.Therefore, protection scope of the present invention should be with right
It is required that protection scope subject to.
Claims (5)
1. a kind of pressure fan RB control method based on blower system status monitoring characterized by comprising 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 operational process does not jump
Lock but the unusual service condition that can not be contributed trigger supply air system exception RB, and carry out a series of when detecting unusual service condition in time
Protection act realizes unit fast cutback, maintains the safe and stable operation of unit；
The detection of the supply air system unusual service condition specifically: 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；
The judgement and triggering supply air system exception RB specifically:
1) pressure fan current of electric bust to idle electric current or two pressure fan current of electric deviations is greater than 15% rated current, and
Total blast volume is lower than alarming value, is delayed 3 seconds, and the low pressure fan of direct tripping current triggers supply air system exception RB；
2) total blast volume is lower than trip value, postpones 3 seconds, shunt tripping outlet pressure and the low pressure fan of current of electric, triggering air-supply system
Unite exception RB.
2. a kind of pressure fan RB control method based on blower system status monitoring according to claim 1, feature
It is, when the bad quality of any pressure fan motor current signal, if " two pressure fan outlet pressure deviations are greater than 10% specified pressure
Power, and total blast volume is lower than alarming value, is delayed 3 seconds ", the low pressure fan of direct tripping current triggers supply air system exception RB.
3. a kind of pressure fan RB control method based on blower system status monitoring according to claim 1, feature
It is, when the bad quality of pressure fan current of electric, the low pressure fan of tripping outlet pressure.
4. a kind of pressure fan RB control method based on blower system status monitoring according to claim 1, feature
It is, the alarming value air quantity uses the wind coal limit value air quantity of unit current combustion coal amount, and the trip value air quantity is by working as
Air quantity definite value that the corresponding minimum of preceding boiler combustion coal amount is flammable increases the biasing of setting to determine.
5. a kind of pressure fan RB control method based on blower system status monitoring according to claim 1, feature
It is, a series of protection acts of carry out specifically:
1) when unit load is greater than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, according to setting sequence with the interval 5s tripping coal pulverizer, most
Retain 3 coal pulverizer operations eventually；
B) override control, which increases, operates normally pressure fan and air-introduced machine movable vane aperture, increases blower power output, after override control
It puts into air quantity and furnace pressure automatically controls；
C) boiler master output is set as 50% boiler load；
2) when unit load is less than 50% rated load before RB is triggered:
A) pressure fan for the abnormal supply air system that trips and ipsilateral air-introduced machine, override control, which increases, operates normally pressure fan and air-introduced machine
Movable vane aperture, increases blower power output, and air quantity is put into after override control and furnace pressure automatically controls；
B) total coal-supplying amount that coal pulverizer is run after boiler master output tracking RB corresponds to boiler load.
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| CN110146310B (en) * | 2018-02-13 | 2021-08-17 | 上海明华电力科技有限公司 | Cold state simulation test method for RB function of induced draft fan |
| CN110242978B (en) * | 2019-06-14 | 2021-02-23 | 中国神华能源股份有限公司 | Variable frequency control method and device for thermal power generating unit blower |
| CN110388655B (en) * | 2019-07-05 | 2021-02-02 | 华北电力科学研究院有限责任公司 | Boiler double-row fan unilateral operation 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 |
| CN112923393B (en) * | 2021-03-31 | 2023-04-18 | 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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| US3955359A (en) * | 1973-06-20 | 1976-05-11 | Westinghouse Electric Corporation | Bearing temperature system failure detection apparatus suitable for use in power plants and like apparatus |
| EP2042743B1 (en) * | 2007-09-27 | 2014-11-05 | ABB Research Ltd. | A gas compression system and a method for controlling a gas compression system. |
| US8556569B2 (en) * | 2009-12-30 | 2013-10-15 | General Electric Company | Method for operating steam turbine with transient elevated back pressure |
| CN102591201B (en) * | 2012-02-09 | 2014-02-12 | 山东电力研究院 | Control method of integral saturation resistance in auxiliary machine failure load reduction process |
| CN102928245A (en) * | 2012-10-25 | 2013-02-13 | 辽宁省电力有限公司电力科学研究院 | RB (Radio Beacon) test no-load release method |
| CN104020737B (en) * | 2014-05-21 | 2016-06-15 | 国家电网公司 | A kind of slurry circulating pump RB control method of fired power generating unit |
| CN105805040B (en) * | 2014-12-30 | 2018-10-30 | 华润电力（菏泽）有限公司 | The method and stall detecting system of RB are triggered after primary air fan stall |
| CN105135405A (en) * | 2015-08-17 | 2015-12-09 | 国家电网公司 | Induced draft fan RB control method of high-sodium lignite tower boiler unit |
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