CN102606464A - Real-time monitoring and preventing method for surge and stall of axial flow fan - Google Patents
Real-time monitoring and preventing method for surge and stall of axial flow fan Download PDFInfo
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- CN102606464A CN102606464A CN2011104294509A CN201110429450A CN102606464A CN 102606464 A CN102606464 A CN 102606464A CN 2011104294509 A CN2011104294509 A CN 2011104294509A CN 201110429450 A CN201110429450 A CN 201110429450A CN 102606464 A CN102606464 A CN 102606464A
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Abstract
The invention discloses a real-time monitoring and preventing method for surge and stall of an axial flow fan, wherein the method can monitor parameters of installation angles, air quantity, pressure heads and the like of a movable blade of a fan in real time and send monitoring values into a working point corresponding to a fan performance curve in a monitoring system to compare whether the working point is around a surge and stall alarm zone of a running curve to timely judge and early warn. The real-time monitoring and preventing method can timely find safety hazards in running of the fan, hysteresis quality of monitoring and prevention is eliminated, stability of burning work conditions of a boiler is effectively guaranteed, and a machine set is led to run safely and stably.
Description
Technical field
The invention belongs to the axial fan field, relate to a kind of detection and accident prevention method to the axial fan operating mode, especially a kind of axial-flow blower surge and stall is monitoring and prevention method in real time.
Background technique
Axial fan is the blower fan of a kind of low-head, big flow, and its superiority obtains everybody approval day by day, and is widely used in each industrial field.The axial-flow blower complex structure, the dynamic component of rotation is more, so its reliability ratio centrifugal blower fan is slightly weaker, is mainly reflected in the surge stall of blower fan.During the blower fan surge; What air-flow was strong flows periodically back and forth, can cause noise to become big, blade stress increasing, to impeller and bearing and the very big impulse force of connected element generation thereof; When these power increase to a certain degree; The rotation and the static part of blower fan are ruptured, even destroy whole blower fan, so we to avoid blower fan in the work of surge stall zone.The surge stall monitoring of axial-flow blower is the monitor alarm that carries out its running state with the form of surge stall switch at present; After the surge switch is reported to the police; Remind operations staff's blower fan to get in the nonclient area; Must handle timely, prevent that long-term surge from causing the damage of equipment and the instability of operating conditions.When after surge takes place, handling, not only the security of operation to unit has caused adverse effect, and equipment has been caused certain infringement, so be necessary that surge prevents in advance to blower fan again.
Surge takes place in when operation in blower fan, and the flow of blower fan, total head and power produce pulsation or significantly pulsation, simultaneously with obvious noise, sometimes or even the noise of high-decibel.Vibration during surge is very violent sometimes, damages blower fan and pipe-line system, so blower fan can't normally move when surge takes place.For the early warning surging phenomenon takes place, axial-flow blower is the device surge alarm device at the impeller inlet place normally, and this device is the place ahead that is arranged in impeller by a Pitot tube, and the opening of Pitot tube is shown in the following figure facing to the sense of rotation of impeller.Pitot tube is that the end with a straight tube curves 90 ° (with openings of Pitot tube facing to airflow direction), links to each other with Pitot tube with a U-shaped pipe, and then the reading of U-shaped pipe (pressure gauge) should be the kinetic energy (dynamic pressure) and the static pressure sum (total head) of air-flow.Under normal circumstances, the stream pressure that Pitot tube measured is a negative value, is the pressure before the impeller because it measures.But when blower fan gets into surge area work, because producing, stream pressure fluctuates widely, so the pressure that Pitot tube measures also is the value of a fluctuation.For the pulsating pressure that Pitot tube is sent can send alarm signal through pressure switch; The alarming value of Pitot tube is to stipulate like this: when moving vane is in minimum angles position (30 °); Record the preceding pressure of draught fan impeller with a U-shaped pipe and add 2000Pa pressure, as the warning setting valve of surge alarm device.When operating conditions surpasses surge limit, through Pitot tube and differential pressure switch, utilize acousto-optic to send alarm signal to operating console, require the operations staff in time to handle, make blower fan return the nominal situation operation.
Surge stall alert switch uses defective: use obviously some hysteresis of means as the axial-flow blower running state monitoring of surge stall switch; Treat surge stall phenomenon take place after again approaches often have a few the meaning of " mending the fold after the sheep is lost "; Might cause the infringement of Fan Equipment to take place thus; More even have influence on the stable combustion condition of boiler and cause boiler MFT tripping operation, safety, the stable operation deleterious impact of giving unit.
The above surge stall switch is as a kind of needs that can not satisfy generator set long-term safety, economical operation to " reprocessing " mode of current blower fan accident condition early warning; So under this its development, need find and a kind of surge stall phenomenon in the axial-flow blower running carried out real time on-line monitoring, and method of preventing accident in advance and taking place.
Summary of the invention
The objective of the invention is to overcome the shortcoming of above-mentioned existing technology; A kind of axial-flow blower surge and stall monitoring and prevention method in real time are provided; This method adopts parameters such as moving vane setting angle to blower fan, air quantity, pressure head to monitor in real time; And will monitor numerical value and send into the corresponding operation point of characteristic curve of fan in the monitoring system, whether near the surge stall alert district of operation curve, come in time to judge and early warning to contrast its position, operation point.Thereby can find prevention in advance, avoid the operation point of blower fan to get in the surge stall zone, help the safe and stable operation of unit, produce certain economic benefits, avoid unnecessary equipment damage accident to take place.
The objective of the invention is to solve through following technological scheme:
This axial-flow blower surge and stall is monitoring and prevention method in real time, comprising:
(1) keeps watch on axial-flow fan blade angle and fan pressure head, be depicted as the thermal control curve after the blade angle data test premenstruum (premenstrua) actual measurement that the aperture instruction of fan blade is corresponding and be input in thermal technology's control system;
(2) the blower fan Q-H curve negotiating thermal technology who producer is provided is depicted as the thermal control curve of this blower fan; To move the back performance curve demonstration of this blower fan thermal control performance curve chart integration that fan pressure head shows on the CRT picture again as blower fan in thermal control performance curve chart upper blade angle pairing blower fan real-time working point A and thermal technology's control system; Show current running state position; Judge that present operating point A is whether in the work of the performance curve safety zone of blower fan; Compare with the preset surge alarm line that is presented on the thermal control performance curve chart; And in the scope that surge stall alert line is set, send early warning, inform that the operation personnel judge in advance and handle;
(3) in the fan operation process, obtain the real-time blade angle of fan operation, compare simultaneously according to fan operation pressure head in real time, and with the thermal control curve of finishing in advance, work in the safety zone judging whether.
Further, in the above step (2), through the real-time blade angle that the fan blade aperture is instructed, feedback information directly obtains fan operation, gather real-time blower fan outlet operation pressure head simultaneously in the fan operation process as real-time fan operation pressure head.
The fan blade aperture is input in thermal technology's control system after collecting by corresponding blade angle data test premenstruum (premenstrua) by-30 °～+ 15 ° of 0%～100% aperture instruction.
Utilize function generator, generate the surge curve alarming line, put into automatic control system.
The present invention adopts parameters such as moving vane setting angle to blower fan, air quantity, pressure head to monitor in real time; And will monitor numerical value and send into the corresponding operation point of characteristic curve of fan in the monitoring system, whether near the surge stall alert district of operation curve, come in time to judge and early warning to contrast its position, operation point.Can in time find the potential safety hazard in the fan operation, monitoring and prevention do not have hysteresis quality, can effectively guarantee the stable combustion condition of boiler, thereby make unit safety, stable operation.
Description of drawings
The blower fan thermal control performance chart that Fig. 1 draws for X-Y plotter;
Fig. 2 reduces the control pathway figure of blade angle for the present invention;
Fig. 3 is a FB(flow block) of the present invention;
Fig. 4 is an axial-flow blower Q-H performance curve.
Embodiment
The left side of axial-flow blower performance curve has a saddle-shaped zone; The pulsation significantly of flow, pressure head and the power of blower fan can appear in this section operation; Blower fan and pipeline can produce strong vibration, equipment operation noise thus and undesired operating mode such as significantly increase; Be commonly referred to as " surge ", this unstable period district is called surge area.As shown in Figure 4, axial-flow blower Q-H performance curve, as if the flow that reduces blower fan with throttling governing method, on K point right side, then blower fan work is stable like the blower fan operation point.When the flow Q of blower fan＜QK; At this moment the maximum pressure head that blower fan produced will descend thereupon, and less than the pressure in the pipeline, because the ducting system capacity is bigger; This in a flash the pressure in the air channel still be HK; Therefore the pressure in the air channel makes air-flow begin to flow backwards in the other direction greater than the pressure head that blower fan produced, and is poured in the blower fan by the air channel, and the operation point moves to the C point rapidly by the K point.But air-flow flows backwards the air quantity in the ducting system is reduced, thereby pressure descends rapidly in the air channel, the D point of operation point when the CD line is dropped rapidly to flow Q=0, and the air quantity that this moment, blower fan was supplied with is zero.Because blower fan remaining in operation, so when the reduction of the pressure in the air channel point of falling the corresponding D, blower fan begins output flow again, for the air channel in pressure balance each other, operating point skips to corresponding operating point F from D again.As long as extraneous required flow keeps less than QK, said process repeats again to occur.If the working state of blower fan is carried out by F-K-C-D-F again and again, this circuit frequency will cause resonance when being in step with the oscillation frequency of blower fan system, and surge has taken place blower fan.
When blower fan was worked in surge area, the flow rapid fluctuation produced the bump of air-flow, makes blower fan that strong vibration take place, and noise increases, and blast constantly rocks, and the capacity of blower fan and pressure head are big more, and then the harmfulness of surge is big more.So producing surge, blower fan should possess following condition:
A) operation point of blower fan is dropped in the unstable region with hump shape Q-H performance curve;
B) ducting system has enough big volume, and it and blower fan are formed a flexible aerodynamic force system;
When c) the air-flow oscillation frequency of the frequency of whole circulation and system is in step with, produce resonance.
Produce surge for fear of blower fan; The axial-flow blower surge that the present invention proposes and stall monitoring in real time and prevention method employing are monitored parameters such as the moving vane setting angle of blower fan, air quantity, pressure heads in real time; And will monitor numerical value and send into the corresponding operation point of characteristic curve of fan in the monitoring system, whether near the surge stall alert district of operation curve, come in time to judge and early warning to contrast its position, operation point.Below in conjunction with accompanying drawing the present invention is done (referring to Fig. 3) is described in further detail:
(1) keeps watch on blade angle and fan pressure head.Be input in thermal technology's control system through being depicted as the thermal control curve after the actual on the spot blade angle of blower fan (for example: the blade angle scope is between-30 °～+ 15 °) the data test premenstruum (premenstrua) actual measurement of the per 5% instruction correspondence of fan blade aperture instruction (0%～100%) is collected; Through the real-time blade angle that blade (0%～100%) aperture is instructed, feedback information directly obtains fan operation, gather real-time blower fan outlet operation pressure head (getting into air preheater fan pressure head before) simultaneously in the fan operation process;
(2) this characteristic curve of fan (Q-H curve) that in addition producer is provided is depicted as the thermal control performance curve chart (as shown in Figure 1) of this blower fan through the thermal technology; To move the back performance curve demonstration of this blower fan thermal control performance curve chart integration that fan pressure head shows again as blower fan on thermal control performance curve chart upper blade angle pairing blower fan real-time working point A and CRT picture; Show current running state position; Judge that present operating point A is whether in the work of the performance curve safety zone of blower fan; Compare analysis with the preset surge alarm line that is presented on the thermal control performance curve chart; And in the certain limit that surge stall alert line is set, send early warning, inform that the operation personnel judge in advance and handle.Through the real-time blade angle that the fan blade aperture is instructed, feedback information directly obtains fan operation, gather real-time blower fan outlet operation pressure head simultaneously in the fan operation process as real-time fan operation pressure head.
Like Fig. 2, measure the real-time traffic of gathering fan operation, and export actual air volume according to the inleakage inverse blower fan of air preheater, simultaneously according to blower fan discharge head data information, generate the current acceptable operating point A of blower fan
1, keep watch on judgement with the synchronous assistance operator of operation point A.
And fan delivery and pressure head signal are sent into thermal technology Q-H plotter, to keep watch on.On CRT, the draw roadability curve of blower fan, and the acceptable operating point of blower fan shown up the operation point is set to the A point, the operator can directly see the operation working state of blower fan from above, as shown in the figure.
More than utilize function generator, generate the surge curve alarming line, put into automatic control system,, then send alarm signal when operating point during near surge line.
Gather fan operation real-time current, vibrating numerical information, the assistance operator keeps watch on and judges.
Claims (4)
1. axial-flow blower surge and stall monitoring and prevention method in real time is characterized in that:
(1) keeps watch on axial-flow fan blade angle and fan pressure head, be depicted as the thermal control curve after the blade angle data test premenstruum (premenstrua) actual measurement that the aperture instruction of fan blade is corresponding and be input in thermal technology's control system;
(2) the blower fan Q-H curve negotiating thermal technology who producer is provided is depicted as the thermal control curve of this blower fan; To move the back performance curve demonstration of this blower fan thermal control performance curve chart integration that fan pressure head shows on the CRT picture again as blower fan in thermal control performance curve chart upper blade angle pairing blower fan real-time working point A and thermal technology's control system; Show current running state position; Judge that present operating point A is whether in the work of the performance curve safety zone of blower fan; Compare with the preset surge alarm line that is presented on the thermal control performance curve chart; And in the scope that surge stall alert line is set, send early warning, inform that the operation personnel judge in advance and handle;
(3) in the fan operation process, obtain the real-time blade angle of fan operation, compare simultaneously according to fan operation pressure head in real time, and with the thermal control curve of finishing in advance, work in the safety zone judging whether.
2. axial-flow blower surge according to claim 1 and stall is monitoring and prevention method in real time; It is characterized in that: in the step (2); Through the real-time blade angle that the fan blade aperture is instructed, feedback information directly obtains fan operation, gather real-time blower fan outlet operation pressure head simultaneously in the fan operation process as real-time fan operation pressure head.
3. axial-flow blower surge according to claim 1 and stall is monitoring and prevention method in real time; It is characterized in that, the fan blade aperture is input in thermal technology's control system after collecting by corresponding blade angle data test premenstruum (premenstrua) by-30 °～+ 15 ° of 0%～100% aperture instruction.
4. axial-flow blower surge according to claim 1 and stall is monitoring and prevention method in real time, it is characterized in that, utilizes function generator, generates the surge curve alarming line, puts into automatic control system.
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| CN201110429450.9A CN102606464B (en) | 2011-12-15 | 2011-12-15 | Real-time monitoring and preventing method for surge and stall of axial flow fan |
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| CN201110429450.9A CN102606464B (en) | 2011-12-15 | 2011-12-15 | Real-time monitoring and preventing method for surge and stall of axial flow fan |
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| CN102606464B CN102606464B (en) | 2014-12-10 |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154024A (en) * | 2014-08-20 | 2014-11-19 | 中国船舶重工集团公司第七0四研究所 | Test decoupling device for physical separation of excitation characteristics of centrifugal fan |
| CN106382245A (en) * | 2016-12-01 | 2017-02-08 | 王先宏 | Surge control method and system for compressor |
| CN106704241A (en) * | 2017-02-27 | 2017-05-24 | 杭州志驱传动技术有限公司 | Fan stable operation control method |
| CN106895022A (en) * | 2017-04-18 | 2017-06-27 | 沈阳鼓风机集团自动控制系统工程有限公司 | Anti-surge control method, control device and control system |
| CN107313968A (en) * | 2017-07-13 | 2017-11-03 | 浙江双阳风机有限公司 | A kind of control method of convection rotary type axial flow fan with adjustable moving blades |
| CN107420339A (en) * | 2017-09-21 | 2017-12-01 | 东华工程科技股份有限公司 | A kind of Novel centrifugal compressor surge detection method |
| CN109826816A (en) * | 2018-12-29 | 2019-05-31 | 浙江大学 | A kind of fan stall intelligent early-warning system and method |
| CN110186067A (en) * | 2019-05-08 | 2019-08-30 | 国网浙江省电力有限公司电力科学研究院 | A kind of cigarette air duct coupled system preventing fan stall |
| CN110472211A (en) * | 2019-07-19 | 2019-11-19 | 深圳中雅机电实业有限公司 | Indicate the display diagram of incidence relation between silencer proper property |
| CN111486113A (en) * | 2020-03-18 | 2020-08-04 | 北京化工大学 | Moving blade adjustable axial flow fan surge early warning method and device |
| CN112412861A (en) * | 2020-11-19 | 2021-02-26 | 国能开远发电有限公司 | Method and system for realizing visualization of running working point of axial flow fan |
| CN113153794A (en) * | 2021-04-06 | 2021-07-23 | 新奥数能科技有限公司 | Cloud computing-based fan online monitoring method, device and system |
| CN113253018A (en) * | 2021-04-20 | 2021-08-13 | 苏州西热节能环保技术有限公司 | Electric energy balance monitoring method for coal-fired power plant |
| CN113669294A (en) * | 2021-07-29 | 2021-11-19 | 华能(浙江)能源开发有限公司玉环分公司 | Induced draft fan stall early warning method |
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Cited By (18)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104154024A (en) * | 2014-08-20 | 2014-11-19 | 中国船舶重工集团公司第七0四研究所 | Test decoupling device for physical separation of excitation characteristics of centrifugal fan |
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| CN106704241A (en) * | 2017-02-27 | 2017-05-24 | 杭州志驱传动技术有限公司 | Fan stable operation control method |
| CN106895022A (en) * | 2017-04-18 | 2017-06-27 | 沈阳鼓风机集团自动控制系统工程有限公司 | Anti-surge control method, control device and control system |
| CN106895022B (en) * | 2017-04-18 | 2018-04-06 | 沈阳鼓风机集团自动控制系统工程有限公司 | Anti-surge control method, control device and control system |
| CN107313968B (en) * | 2017-07-13 | 2019-01-22 | 浙江双阳风机有限公司 | A kind of control method of convection rotary type axial flow fan with adjustable moving blades |
| CN107313968A (en) * | 2017-07-13 | 2017-11-03 | 浙江双阳风机有限公司 | A kind of control method of convection rotary type axial flow fan with adjustable moving blades |
| CN107420339B (en) * | 2017-09-21 | 2019-03-05 | 东华工程科技股份有限公司 | A kind of Novel centrifugal compressor surge detection method |
| CN107420339A (en) * | 2017-09-21 | 2017-12-01 | 东华工程科技股份有限公司 | A kind of Novel centrifugal compressor surge detection method |
| CN109826816A (en) * | 2018-12-29 | 2019-05-31 | 浙江大学 | A kind of fan stall intelligent early-warning system and method |
| CN109826816B (en) * | 2018-12-29 | 2020-04-24 | 浙江大学 | Intelligent early warning system and method for fan stall |
| CN110186067A (en) * | 2019-05-08 | 2019-08-30 | 国网浙江省电力有限公司电力科学研究院 | A kind of cigarette air duct coupled system preventing fan stall |
| CN110472211A (en) * | 2019-07-19 | 2019-11-19 | 深圳中雅机电实业有限公司 | Indicate the display diagram of incidence relation between silencer proper property |
| CN111486113A (en) * | 2020-03-18 | 2020-08-04 | 北京化工大学 | Moving blade adjustable axial flow fan surge early warning method and device |
| CN112412861A (en) * | 2020-11-19 | 2021-02-26 | 国能开远发电有限公司 | Method and system for realizing visualization of running working point of axial flow fan |
| CN113153794A (en) * | 2021-04-06 | 2021-07-23 | 新奥数能科技有限公司 | Cloud computing-based fan online monitoring method, device and system |
| CN113253018A (en) * | 2021-04-20 | 2021-08-13 | 苏州西热节能环保技术有限公司 | Electric energy balance monitoring method for coal-fired power plant |
| CN113669294A (en) * | 2021-07-29 | 2021-11-19 | 华能(浙江)能源开发有限公司玉环分公司 | Induced draft fan stall early warning method |
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