CN107238102A - A kind of primary air fan RB control methods under full load mode - Google Patents
A kind of primary air fan RB control methods under full load mode Download PDFInfo
- Publication number
- CN107238102A CN107238102A CN201710397437.7A CN201710397437A CN107238102A CN 107238102 A CN107238102 A CN 107238102A CN 201710397437 A CN201710397437 A CN 201710397437A CN 107238102 A CN107238102 A CN 107238102A
- Authority
- CN
- China
- Prior art keywords
- primary air
- air fan
- pressure
- full load
- coal pulverizer
- 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
- F23N3/00—Regulating air supply or draught
-
- 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
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)
- Disintegrating Or Milling (AREA)
Abstract
The present invention relates to the primary air fan RB control methods under a kind of full load mode, including：According to primary air fan main-piping pressure, primary air fan outlet pressure and primary air fan current of electric situation of change in full load section; 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 technique, more particularly, to the primary air fan under a kind of full load mode
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 RB condition tripped for primary air fan and the power of the assembling unit exert oneself it is specified more than 50% negative
Lotus.However, when occurring, primary air piping is damaged, connecting rod comes off or during the failure such as shaft coupling fracture between primary air fan and motor, and this one
Secondary wind system is not exerted oneself substantially, but because primary air fan does not trip, it is impossible to reach triggering unit RB condition, it is impossible to automatic real
The urgent load down of existing unit, 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 under a kind of full load mode
Primary air fan RB control methods.
The purpose of the present invention can be achieved through the following technical solutions：
A kind of primary air fan RB control methods under full load mode, including：According to primary air fan main pipe in full load section
Pressure, primary air fan outlet pressure and primary air fan current of electric situation of change, judge whether First air occur in running
The unusual service condition that machine does not trip but can not exerted oneself, when detecting unusual service condition, triggering primary air system exception RB, goes forward side by side in time
A series of protection acts of row, realize unit fast cutback, maintain the safe and stable operation of unit.
Described primary air system unusual service condition detection process is as follows：In full load section, when coal pulverizer machine operation number of units is big
In equal to 2 and during the operation of two primary air fans, detection primary air fan main-piping pressure, primary air fan outlet pressure and primary air fan
Current of electric situation of change, to judge and trigger primary air system exception RB.
Described judgement and triggering primary air system exception RB are specially：
1) primary air fan electric current 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, triggering primary air system exception RB；
2) primary air fan pressure is less than tripping operation pressure, and be delayed 3s, 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.
Alarm pressure uses the low alarming value of unit First air main-piping pressure in two kinds of situations, and tripping operation pressure is by First air main pipe
The definite value increase setting biasing of the low tripping operation pulverized coal preparation system of pressure is determined.
A series of described protection acts of carry out include：
1) do not trip primary air fan, according to setting order trip a coal pulverizer, connection close tripping operation coal pulverizer cold-hot air door and
Outlet portal；
2) after coal pulverizer tripping operation, if primary air fan outlet main-piping pressure continues less than tripping operation pressure, by setting order in 10s
Continue the coal pulverizer that trips, connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
3) step 2 is continued executing with), until remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure
Untill,
4) 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 coal pulverizer tripping operation, after less than or equal to 3 coal pulverizer operations, startup unit fuel oil is combustion-supporting or plasma is drawn
Arc is combustion-supporting.
Compared with prior art, according to primary air fan main-piping pressure, primary air fan outlet pressure in full load section of the present invention
With primary air fan current of electric situation of change, judge occur the abnormal work that primary air fan does not trip but can not exerted oneself in running
Condition, when detecting unusual service condition, 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.
Brief description of the drawings
Fig. 1 is workflow diagram 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 primary air fan main-piping pressure, primary air fan outlet pressure and once in full load of the present invention section
Blower motor curent change situation, judges that occurring primary air piping damage, primary air fan connecting rod in running comes off or shaft coupling
The primary air system unusual service conditions such as fracture, when detecting unusual service condition, triggering primary air system exception RB, and carry out one in time
Serial protection act, realizes unit fast cutback, maintains the safe and stable operation of unit：
In full load section, when coal pulverizer machine operation number of units is more than or equal to 2 and two primary air fan operations, detection is once
Blower fan main-piping pressure, primary air fan outlet pressure and primary air fan current of electric situation of change, judge and trigger as follows
Primary air system exception RB：
1) primary air fan electric current bust to idle electric current or two primary air fan current of electric deviations is more than 15% specified electricity
Stream (when the bad quality of any primary air fan motor current signal, is more than 10% volume using two primary air fan outlet pressure deviations
Constant-pressure is judged), and primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds, triggering primary air system exception RB；
2) primary air fan pressure is less than tripping operation pressure, and be delayed 3s, 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) do not trip primary air fan, according to setting order trip a coal pulverizer, connection close tripping operation coal pulverizer cold-hot air door and
Outlet portal；
2) 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.
3) step 2 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 less than or equal to 3 coal pulverizer operations, startup unit fuel oil is combustion-supporting or plasma arcing is combustion-supporting；
4) 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) according to primary air fan main-piping pressure, primary air fan outlet pressure and blower motor curent change situation, by as follows
Method judges 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, triggering primary air system exception RB；
B) primary air fan pressure is less than 6.3kPa, and be delayed 3s, triggering primary air system exception RB；
Primary air fan：
3) after primary air fan exception RB triggerings：
A) according to coal pulverizer running situation, by F-E-D-C-B order one coal pulverizer of tripping operation, it is cold that connection closes tripping operation coal pulverizer
Hot air disperser and outlet portal；
B) coal pulverizer tripping operation 10s in as primary air fan main-piping pressure be more than 6.3kPa, then RB success, otherwise by step a) after
Continuous tripping operation coal pulverizer, RB fails if only remaining coal pulverizer operation, stops tripping operation coal pulverizer.During coal pulverizer tripping operation,
The fuel system that put into operation automatically when running coal pulverizer and being less than or equal to 3 or plasma arcing are combustion-supporting.
C) during primary air system exception RB, total coal-supplying amount of unit boiler master control output tracking residue operation coal pulverizer
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 (7)
1. the primary air fan RB control methods under a kind of full load mode, it is characterised in that including：According to once in full load section
Whether blower fan main-piping pressure, primary air fan outlet pressure and primary air fan current of electric situation of change, judge to go out in running
The unusual service condition that existing primary air fan does not trip but can not exerted oneself, when detecting unusual service condition, triggering primary air system is different in time
Normal RB, and a series of protection acts are carried out, unit fast cutback is realized, the safe and stable operation of unit is maintained.
2. the primary air fan RB control methods under a kind of full load mode according to claim 1, it is characterised in that described
Primary air system unusual service condition detection process it is as follows：In full load section, when coal pulverizer machine operation number of units is more than or equal to 2 and two
When platform primary air fan is run, detection primary air fan main-piping pressure, primary air fan outlet pressure and the change of primary air fan current of electric
Situation, to judge and trigger primary air system exception RB.
3. the primary air fan RB control methods under a kind of full load mode according to claim 2, it is characterised in that described
Judgement and triggering primary air system exception RB be specially：
1) primary air fan electric current bust to idle electric current or two primary air fan current of electric deviations is more than 15% rated current, and
Primary air fan main-piping pressure is less than alarming value, is delayed 3 seconds, triggering primary air system exception RB；
2) primary air fan pressure is less than tripping operation pressure, and be delayed 3s, triggering primary air system exception RB.
4. the primary air fan RB control methods under a kind of full load mode according to claim 3, it is characterised in that when appointing
During the bad quality of one blower motor current signals, use " two primary air fan outlet pressure deviations are more than 10% rated pressure,
And primary air fan main-piping pressure is less than alarming value, it is delayed 3 seconds " judged.
5. the primary air fan RB control methods under a kind of full load mode according to claim 3, it is characterised in that two kinds
Alarm pressure uses the low alarming value of unit First air main-piping pressure in situation, and tripping operation pressure is made by the low tripping operation of First air main-piping pressure
The definite value increase setting biasing of powder system is determined.
6. the primary air fan RB control methods under a kind of full load mode according to claim 1, it is characterised in that described
A series of protection acts of carry out include：
1) do not trip primary air fan, and according to setting order one coal pulverizer of tripping operation, connection closes tripping operation coal pulverizer cold-hot air door and outlet
Door；
2) after coal pulverizer tripping operation, if primary air fan outlet main-piping pressure continues, less than tripping operation pressure, by setting order to continue in 10s
Trip a coal pulverizer, and connection closes tripping operation coal pulverizer cold-hot air door and outlet portal；
3) step 2 is continued executing with), untill remaining 1 coal pulverizer operation or primary air fan main-piping pressure are more than tripping operation pressure,
4) during primary air system exception RB, total coal-supplying amount correspondence of unit boiler master control output tracking residue operation coal pulverizer
Boiler load.
7. the primary air fan RB control methods under a kind of full load mode according to claim 6, it is characterised in that coal-grinding
During machine tripping operation, after less than or equal to 3 coal pulverizer operations, startup unit fuel oil is combustion-supporting or plasma arcing is combustion-supporting.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710397437.7A CN107238102B (en) | 2017-05-31 | 2017-05-31 | A kind of primary air fan RB control method under full load mode |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710397437.7A CN107238102B (en) | 2017-05-31 | 2017-05-31 | A kind of primary air fan RB control method under full load mode |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107238102A true CN107238102A (en) | 2017-10-10 |
| CN107238102B CN107238102B (en) | 2019-01-29 |
Family
ID=59985956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710397437.7A Active CN107238102B (en) | 2017-05-31 | 2017-05-31 | A kind of primary air fan RB control method under full load mode |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107238102B (en) |
Cited By (2)
| 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 |
| CN110793056A (en) * | 2019-11-06 | 2020-02-14 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61202011A (en) * | 1985-03-01 | 1986-09-06 | Sanyo Electric Co Ltd | Combustion apparatus of forced feed and discharge type |
| JPS6475814A (en) * | 1987-09-17 | 1989-03-22 | Hitachi Ltd | Control system for pressure in furnace |
| CN103256624A (en) * | 2013-03-29 | 2013-08-21 | 国家电网公司 | Method and system for controlling negative pressure of furnace hearths of thermal power plant |
| CN103712235A (en) * | 2013-12-26 | 2014-04-09 | 广东电网公司电力科学研究院 | Primary air fan controlling method and device |
| CN104197367A (en) * | 2014-08-04 | 2014-12-10 | 国家电网公司 | Primary air fan RB optimal control method based on mother tube pressure |
| CN105805040A (en) * | 2014-12-30 | 2016-07-27 | 华润电力（菏泽）有限公司 | Method for triggering RB after primary air fan stalls and stall detection system |
-
2017
- 2017-05-31 CN CN201710397437.7A patent/CN107238102B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61202011A (en) * | 1985-03-01 | 1986-09-06 | Sanyo Electric Co Ltd | Combustion apparatus of forced feed and discharge type |
| JPS6475814A (en) * | 1987-09-17 | 1989-03-22 | Hitachi Ltd | Control system for pressure in furnace |
| CN103256624A (en) * | 2013-03-29 | 2013-08-21 | 国家电网公司 | Method and system for controlling negative pressure of furnace hearths of thermal power plant |
| CN103712235A (en) * | 2013-12-26 | 2014-04-09 | 广东电网公司电力科学研究院 | Primary air fan controlling method and device |
| CN104197367A (en) * | 2014-08-04 | 2014-12-10 | 国家电网公司 | Primary air fan RB optimal control method based on mother tube pressure |
| CN105805040A (en) * | 2014-12-30 | 2016-07-27 | 华润电力（菏泽）有限公司 | Method for triggering RB after primary air fan stalls and stall detection system |
Cited By (3)
| 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 |
| CN110793056A (en) * | 2019-11-06 | 2020-02-14 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
| CN110793056B (en) * | 2019-11-06 | 2021-03-30 | 华北电力科学研究院有限责任公司 | Fault load reduction control system and method for primary fan auxiliary machine of power station boiler |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107238102B (en) | 2019-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN107255268B (en) | A kind of primary air fan RB control method based on primary air fan system state monitoring | |
| CN107228088A (en) | A kind of pressure fan RB control methods based on blower system status monitoring | |
| CN105805040B (en) | The method and stall detecting system of RB are triggered after primary air fan stall | |
| CN104197367B (en) | Primary air fan RB optimal control method based on mother tube pressure | |
| CN111102024A (en) | High-pressure-rise RB (radio frequency) comprehensive control device and method based on boiler following strategy | |
| CN107238102B (en) | A kind of primary air fan RB control method under full load mode | |
| CN112628711A (en) | Auxiliary engine fault stable combustion control method based on 600MW supercritical unit low load | |
| CN107246401A (en) | A kind of air-introduced machine RB control methods based on draught fan system status monitoring | |
| CN112909903A (en) | High-voltage station grounding protection and fast switching device protection starting combined optimization method | |
| CN104765004A (en) | Detection method and system for variable-pitch battery of wind generating set | |
| CN109974028B (en) | Optimization method for shutdown and non-shutdown of 660MW supercritical coal-fired unit | |
| CN103700411A (en) | Method and system for dealing with loss of coolant accident (LOCA) of nuclear power station | |
| CN111678120A (en) | Control method for joint start of steam feed pump and trip electric pump of 330MW subcritical unit | |
| CN102966578A (en) | Pressure control method and device for pump unit of nuclear power station | |
| CN202093147U (en) | Fault detection device of alternating current motor | |
| CN211524912U (en) | Safety device of steam turbine feed pump | |
| CN103615322B (en) | TRT unit overspeed control system and hypervelocity controlling method thereof | |
| CN106907245B (en) | Fuel supply system and method of controlling an overspeed event in a gas turbine engine | |
| CN104637558B (en) | Safe and stable control method for asynchronous oscillation of nuclear power unit | |
| CN204388116U (en) | A kind of boiler fire inspection cooling air system | |
| CN202690402U (en) | Control device for water feeding pump of thermal power plant | |
| CN114768142B (en) | Control method of energy storage system and energy storage system | |
| JP2008035619A (en) | Determination method for individual operation of dispersed power system | |
| KR102247917B1 (en) | Safety accident prevention photovoltaics generation system related to ess | |
| CN106875993B (en) | Presurized water reactor power generator turbine, which has tripped, characterizes signal generating method |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| 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 |