CN105805040B - The method and stall detecting system of RB are triggered after primary air fan stall - Google Patents
The method and stall detecting system of RB are triggered after primary air fan stall Download PDFInfo
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- CN105805040B CN105805040B CN201410843637.7A CN201410843637A CN105805040B CN 105805040 B CN105805040 B CN 105805040B CN 201410843637 A CN201410843637 A CN 201410843637A CN 105805040 B CN105805040 B CN 105805040B
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Abstract
The invention discloses the method and stall detecting system that trigger RB after a kind of primary air fan stall, wherein method includes：According to primary air fan stall standard, judge the primary air fan whether stall；When the primary air fan stall, triggering warning device sends out alarm signal；After preset time, judge whether the primary air fan restores normal；When the primary air fan does not restore normal, RB is triggered.The present invention is according to the primary air fan stall standard, to the primary air fan, whether stall judges, this method can timely and effectively detect the primary air fan whether stall, after the primary air fan stall, send out alarm signal, operations staff can be timely reminded to safeguard the primary air fan, after preset time, detect whether the primary air fan restores normal, when the primary air fan does not restore normal, the primary air fan RB is triggered, avoids, due to can not work normally when the primary air fan stall, causing damages to entire unit.
Description
Technical field
The present invention relates to protection control technology field, more particularly to after a kind of primary air fan stall trigger RB method and
Stall detecting system.
Background technology
Primary air fan is that an important ancillary equipment of coal-burning power plant's air and flue system needs to touch when fan trouble trips
Unit RB is sent out, the load of about half is down to.
In the prior art, the condition of triggering unit RB is primary air fan tripping, however, primary air fan is in normal operation,
Because of various reasons, it some times happens that stall condition, under crisis state, unit needs urgent drop to contribute.
After primary air fan stall, the primary air fan of stall is not contributed substantially, but since primary air fan does not trip, nothing
Method reaches the condition of triggering unit RB, therefore operations staff can not be made timely to find primary air fan stall event, to right
Operations staff intervenes proposition very high request manually, and operations staff is needed to stop the primary air fan of stall manually or drop unit manually to go out
Power, in the prior art, horizontal to the operation of operations staff and process accident requirement are relatively high.
Therefore, how can be timely detected after primary air fan stall and trigger RB, be those skilled in the art
The technical issues that need to address at present.
Invention content
The object of the present invention is to provide methods and stall detecting system that RB is triggered after a kind of primary air fan stall, to ensure
It can be timely detected after primary air fan stall and trigger RB.
In order to solve the above technical problems, the present invention provides the following technical solutions：
A kind of method that RB is triggered after primary air fan stall, including：
According to primary air fan stall standard, judge the primary air fan whether stall；
When the primary air fan stall, triggering warning device sends out alarm signal；
After preset time, judge whether the primary air fan restores normal；
When the primary air fan does not restore normal, RB is triggered.
Preferably, the primary air fan stall standard includes：
The current fall rate of the primary air fan is more than predetermined current fall off rate；
The main-piping pressure fall off rate of the primary air fan is more than preset pressure fall off rate；
The Pitot tube pressure difference of the primary air fan entrance is more than preset pressure；
When the primary air fan reaches at least one above-mentioned standard, the primary air fan stall can determine that.
Preferably, in the primary air fan stall standard, the main-piping pressure fall off rate of the primary air fan is the mother
The average value of pressure drop rate at pipe at least two.
A kind of primary air fan stall monitoring system, including：
Judgment module, for according to primary air fan stall standard, judge the primary air fan whether stall；
Warning device, for alarming in the primary air fan stall；
Detection module, for after the preset time that warning device sends out after alarm, whether extensive detecting the primary air fan
It is multiple normal；
Control module, for when the primary air fan does not restore normal, triggering RB.
Preferably, the judgment module includes：
First fall off rate judgment module, for judging whether the current fall rate of the primary air fan is more than default electricity
Flow fall off rate；
Second fall off rate judgment module, for judging it is pre- whether the main-piping pressure fall off rate of the primary air fan is more than
If pressure drop rate；
Surge switchs, for judging whether the Pitot tube pressure difference of the primary air fan entrance is more than preset pressure；
Judge the primary air fan whether stall when, the judgment module includes at least one above-mentioned apparatus.
Preferably, further include computing module, the computing module is used to calculate at the main pipe at least two reduction of speed under pressure
The average value of rate, the second fall off rate judgment module are additionally operable to judge whether the average value is more than under the preset pressure
Reduction of speed rate.
The method and stall detecting system of RB are triggered after primary air fan stall provided by the present invention, wherein method includes：
According to primary air fan stall standard, judge the primary air fan whether stall；When the primary air fan stall, triggering alarm dress
It sets and sends out alarm signal；After preset time, judge whether the primary air fan restores normal；When the primary air fan does not restore
When normal, RB is triggered.The present invention is according to the primary air fan stall standard, and to the primary air fan, whether stall judges,
This method can timely and effectively detect whether stall sends out alarm to the primary air fan after primary air fan stall
Signal can timely remind operations staff to safeguard the primary air fan, after preset time, detect the First air
Whether machine restores normal, when the primary air fan does not restore normal, that is, triggers the primary air fan RB, avoids due to described one
It can not work normally when secondary fan stall, cause damages to entire unit.
In a preferred embodiment, the primary air fan stall standard includes：The electric current of the primary air fan declines
Rate is more than predetermined current fall off rate；The main-piping pressure fall off rate of the primary air fan is more than preset pressure fall off rate；
The Pitot tube pressure difference of the primary air fan entrance is more than preset pressure.When the primary air fan reaches at least one above-mentioned standard
When, it can determine that the primary air fan stall.This method using electric current, pressure or the pressure that can be detected as criterion,
Can significantly improve this method to judge the primary air fan whether the accuracy of stall.
Description of the drawings
The method flow diagram of RB is triggered after the primary air fan stall that Fig. 1 is provided by the embodiment of the present invention one；
The method flow diagram of RB is triggered after the primary air fan stall that Fig. 2 is provided by the embodiment of the present invention two；
The method flow diagram of RB is triggered after the primary air fan stall that Fig. 3 is provided by the embodiment of the present invention three；
Fig. 4 monitors system schematic by the primary air fan stall that the embodiment of the present invention four provides；
Fig. 5 monitors system schematic by the primary air fan stall that the embodiment of the present invention five provides；
Fig. 6 monitors system schematic by the primary air fan stall that the embodiment of the present invention six provides.
Specific implementation mode
Core of the invention is to provide the method and stall detecting system that RB is triggered after a kind of primary air fan stall, to ensure
It is timely detected after primary air fan stall and triggers RB.
In order to enable those skilled in the art to better understand the solution of the present invention, with reference to the accompanying drawings and detailed description
The present invention is described in further detail.
Referring to FIG. 1, the method that RB is triggered after the primary air fan stall that Fig. 1 is provided by the embodiment of the present invention one, including
Following steps：
S100：According to primary air fan stall standard, judge primary air fan whether stall；
S200：When primary air fan stall, triggering warning device sends out alarm signal；
If not detecting primary air fan stall, primary air fan can continue to keep normal operation.
S300：After preset time, judge whether primary air fan restores normal；
Preset time can rule of thumb be set, such as can be five minutes or ten minutes, set up the mesh of preset time
Be to ensure after alarm signal is sent out, operations staff have time enough primary air fan is safeguarded.
S400：When primary air fan does not restore normal, RB is triggered.
If operations staff fails primary air fan restoring normal in preset time, primary air fan RB is triggered.
The present invention is according to primary air fan stall standard, and to primary air fan, whether stall judges, this method can be timely
Primary air fan is effectively detected out, and whether stall sends out alarm signal after primary air fan stall, can timely remind operation
Personnel safeguard primary air fan, and after preset time, whether detection primary air fan restores normal, when primary air fan does not restore
When normal, that is, primary air fan RB is triggered, avoids, due to can not work normally when primary air fan stall, entire unit being caused to damage
It loses.
Referring to FIG. 2, the method that RB is triggered after the primary air fan stall that Fig. 2 is provided by the embodiment of the present invention two, including
Following steps：
S101：Judge whether the current fall rate of primary air fan is more than predetermined current fall off rate；
S200：When the current fall rate of primary air fan is more than predetermined current fall off rate, triggering warning device is sent out
Alarm signal；
S300：After preset time, judge whether primary air fan restores normal；
S400：When primary air fan does not restore normal, RB is triggered.
Provided in the embodiment judge primary air fan whether the method for stall, utilize reduction of speed under the electric current of primary air fan
Rate as judge primary air fan whether the standard of stall, due to the electric current electricity index important as one, being can be accurate
It measures, the fall off rate of electric current can also be accurately calculated, therefore using current fall rate as the standard of referring to, Neng Goubao
Card judge primary air fan whether the accuracy of stall.
Predetermined current fall off rate can rule of thumb be set, and be preset under the conditions of varying environment, different primary air fans
Current fall rate can be different, and predetermined current fall off rate can be 16A/s.
Referring to FIG. 3, the method that RB is triggered after the primary air fan stall that Fig. 3 is provided by the embodiment of the present invention three, including
Following steps：
S102：Judge whether the main-piping pressure fall off rate of primary air fan is more than preset pressure fall off rate；
S200：When the main-piping pressure fall off rate of primary air fan is more than preset pressure fall off rate, warning device is triggered
Send out alarm signal；
S300：After preset time, judge whether primary air fan restores normal；
S400：When primary air fan does not restore normal, RB is triggered.
In the method that the embodiment is provided, judge whether the standard of stall is main pipe according to primary air fan to primary air fan
Pressure and calculates the fall off rate of main-piping pressure by measuring the main-piping pressure of primary air fan, with preset pressure fall off rate into
Row compares, since when primary air fan stall, main-piping pressure can decline rapidly, by the fall off rate for detecting its main-piping pressure
Judge primary air fan whether stall, can equally ensure the accuracy of judging result.Preset pressure fall off rate equally can root
It is set according to experience, preset pressure fall off rate can be 2KPa/s.
In addition, in order to ensure the accuracy of primary air fan main-piping pressure fall off rate, caused by avoiding single place from taking a little partially
Difference, may be used at least two take at, then by calculating the average value of main-piping pressure fall off rate everywhere, then with default pressure
Power fall off rate is compared, and can so that judging result is more accurate.
Further, judge primary air fan whether the standard of stall may be primary air fan entrance Pitot tube pressure difference it is big
In preset pressure, i.e., judged that preset pressure can be 2.5KPa using surge switch.
In addition, when at least one of above-mentioned three kinds of criterions meet, it can illustrate that primary air fan is in stall shape
State in order to ensure the accuracy of judging result, when can be while meet at least two standards, can judge primary certainly
Wind turbine is in stall conditions, after judging primary air fan stall, you can sends out alarm signal, operations staff is reminded to safeguard, tie up
Primary air fan RB is triggered after shield failure, avoids causing further losing.
What needs to be explained here is that when primary air fan starts, it may occur that then instant starting currents are very big to restore normal
Situation, this can accidentally hair fan stall alarm, and in order to avoid above-mentioned phenomenon, can be opened after starting operation delay 30 seconds wind turbine again
Beginning is detected the indices of primary air fan, you can escapes starting current, prevents from accidentally sending out primary air fan stall alert.
Referring to FIG. 4, Fig. 4 monitors system schematic by the primary air fan stall that the embodiment of the present invention four provides.
Primary air fan stall detecting system provided in the embodiment, including be used for according to primary air fan stall standard,
Judge primary air fan whether the judgment module 1 of stall；Warning device 2 for alarming in primary air fan stall；For
After the preset time that warning device 2 sends out after alarm, whether detection primary air fan restores normal detection module 3；And it uses
In the control module 4 for when primary air fan does not restore normal, triggering RB.
The output end of judgment module 1 is connect with the input terminal of warning device 2, output end and the detection module 3 of warning device 2
Input terminal connection, the output end of detection module 3 connect with the input terminal of control module 4, the output end of control module 4 and once
Wind turbine RB connections.
When judgment module 1 according to primary air fan stall standard judge primary air fan whether stall, when primary air fan stall,
Triggering warning device 2 sends out alarm signal, and alarm signal can be kept for the regular hour after sending out, i.e., in preset time, for fortune
Administrative staff overhauls primary air fan, if primary air fan does not restore normal after maintenance, is triggered once by control module 4
Wind turbine RB.
In specific operating process, pushbutton type may be used in control module 4, and operations staff is facilitated to determine First air
After machine stall, primary air fan RB is triggered manually.
Referring to FIG. 5, Fig. 5 monitors system schematic by the primary air fan stall that the embodiment of the present invention five provides.
Primary air fan stall detecting system provided in the embodiment will determine that module 1 for example IV
Specially the first fall off rate judgment module 11, the first fall off rate judgment module 11 are used to judge that the electric current of primary air fan to decline
Whether rate is more than predetermined current fall off rate, when the current fall rate of primary air fan is more than predetermined current fall off rate,
Warning device 2 will be triggered and send out alarm signal.
Predetermined current fall off rate can rule of thumb be set, and be preset under the conditions of varying environment, different primary air fans
Current fall rate can be different, and predetermined current fall off rate can be 16A/s.
Primary air fan stall detecting system provided in the embodiment will determine that module 1 for example IV
Specially the second fall off rate judgment module 12, the second fall off rate judgment module 12 are used to judge the main-piping pressure of primary air fan
Fall off rate whether be more than preset pressure fall off rate, when main-piping pressure fall off rate be more than preset pressure fall off rate, will
Triggering warning device 2 sends out alarm signal.Preset pressure fall off rate equally can rule of thumb be set, under preset pressure
Reduction of speed rate can be 2KPa/s.
In addition, the system can also include computing module, in order to ensure the accurate of primary air fan main-piping pressure fall off rate
Property, deviation caused by avoiding single place from taking a little, may be used at least two take at, then calculated by computing module female everywhere
The average value of pipe pressure fall off rate, then be compared with preset pressure fall off rate, it can so that judging result is more accurate.
Further, judgment module 1 can also use surge to switch, and surge switchs the skin for judging primary air fan entrance
Whether trustship pressure difference is more than preset pressure, when the Pitot tube pressure difference of primary air fan entrance is more than preset pressure, can trigger report
Alarm device 2 sends out alarm signal, which can be 2.5KPa.
What needs to be explained here is that judge primary air fan whether stall when, judgment module 1 should include above-mentioned three kinds judgement
At least one of module 1 may include certainly in above-mentioned three kinds of judgment modules 1 to ensure the accuracy of judging result
At least two.
After triggering primary air fan RB, operations staff should close the adjusting movable vane baffle of stall primary air fan to 0%.Separately
Outside, after due to working as RB generations, one layer of big oil gun of bottom of throwing can be given tacit consent to and do not throw oil then, still when bottom coal pulverizer is not run
If oil-tight can lead to coal pulverizer combustion instability, therefore can increase when bottom coal pulverizer is not run, interbed fortune was made a basket
The method of the big oil gun of row coal pulverizer, avoid coal pulverizer because combustion instability causes loss of flame and the phenomenon that trip, ensure
The normal operation of coal pulverizer.
The method and stall detecting system of triggering RB after primary air fan stall provided by the present invention have been carried out in detail above
It is thin to introduce.Principle and implementation of the present invention are described for specific case used herein, and above example is said
The bright method and its core concept for being merely used to help understand the present invention.It should be pointed out that for the ordinary skill of the art
, without departing from the principle of the present invention, can be with several improvements and modifications are made to the present invention for personnel, these improvement
It is also fallen within the protection scope of the claims of the present invention with modification.
Claims (4)
1. a kind of method for triggering RB after primary air fan stall, which is characterized in that including：
After primary air fan starts operation delay 30 seconds, start to be detected the indices of primary air fan；
According to primary air fan stall standard, judge the primary air fan whether stall；
When the primary air fan stall, triggering warning device sends out alarm signal；
After preset time, judge whether the primary air fan restores normal；
When the primary air fan does not restore normal, RB is triggered；
The primary air fan stall standard includes：
The current fall rate of the primary air fan is more than predetermined current fall off rate；
The main-piping pressure fall off rate of the primary air fan is more than preset pressure fall off rate；
The Pitot tube pressure difference of the primary air fan entrance is more than preset pressure；
When the primary air fan reaches at least two above-mentioned standards, the primary air fan stall can determine that.
2. the method for triggering RB after primary air fan stall according to claim 1, which is characterized in that the primary air fan loses
In fast standard, the main-piping pressure fall off rate of the primary air fan is that pressure drop rate is averaged at the main pipe at least two
Value.
3. a kind of primary air fan stall monitoring system, which is characterized in that including：
Judgment module (1), for after primary air fan starts operation delay 30 seconds, according to primary air fan stall standard, judging institute
State primary air fan whether stall；
Warning device (2), for alarming in the primary air fan stall；
Detection module (3), for after the preset time that warning device (2) sends out after alarm, whether detecting the primary air fan
Restore normal；
Control module, for when the primary air fan does not restore normal, triggering RB；
The judgment module (1) includes：
First fall off rate judgment module (11), for judging whether the current fall rate of the primary air fan is more than default electricity
Flow fall off rate；
Second fall off rate judgment module (12), for judging it is pre- whether the main-piping pressure fall off rate of the primary air fan is more than
If pressure drop rate；
Surge switchs, for judging whether the Pitot tube pressure difference of the primary air fan entrance is more than preset pressure；
Judge the primary air fan whether stall when, the judgment module (1) includes the first fall off rate judgment module
(11), at least two in the second fall off rate judgment module (12) and surge switch.
4. primary air fan stall monitoring system according to claim 3, which is characterized in that further include computing module, it is described
Computing module is used to calculate the average value of pressure drop rate at the main pipe at least two, the second fall off rate judgment module
(12) it is additionally operable to judge whether the average value is more than the preset pressure fall off rate.
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| CN201410843637.7A CN105805040B (en) | 2014-12-30 | 2014-12-30 | The method and stall detecting system of RB are triggered after primary air fan stall |
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| CN105805040B true CN105805040B (en) | 2018-10-30 |
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| CN107246401B (en) * | 2017-05-31 | 2019-02-01 | 上海明华电力技术工程有限公司 | A kind of air-introduced machine RB control method based on draught fan system status monitoring |
| CN107228088B (en) * | 2017-05-31 | 2019-02-01 | 上海明华电力技术工程有限公司 | A kind of pressure fan RB control method based on blower system status monitoring |
| CN107100877B (en) * | 2017-05-31 | 2018-08-24 | 上海明华电力技术工程有限公司 | A kind of booster fan RB control methods based on booster fan system state monitoring |
| CN107238102B (en) * | 2017-05-31 | 2019-01-29 | 上海明华电力技术工程有限公司 | A kind of primary air fan RB control method under full load mode |
| CN107255268B (en) * | 2017-05-31 | 2019-04-19 | 上海明华电力技术工程有限公司 | A kind of primary air fan RB control method based on primary air fan system state monitoring |
| 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 |
| CN111237231B (en) * | 2020-01-19 | 2021-09-10 | 杭州戬威机电科技有限公司 | Operation monitoring method of axial flow fan with adjustable moving blades |
| CN111946651B (en) * | 2020-08-12 | 2022-04-12 | 中国大唐集团科学技术研究院有限公司华东电力试验研究院 | Fan stall early warning method and system |
| 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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