CN103883551B - A kind of controlling method eliminating axial-flow blower surge - Google Patents
A kind of controlling method eliminating axial-flow blower surge Download PDFInfo
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Abstract
The invention discloses a kind of controlling method eliminating axial-flow blower surge, the electric current of blower fan A and blower fan B is sent into the first subtractor, obtain the current deviation of blower fan A and blower fan B, the current deviation arrived is sent into absolute value block, what absolute value block exported limits module on the occasion of being sent to height, simultaneously, the current deviation obtained is sent to function f (x), when function f (x) has output value, function f (x) output value is sent to controller, after computing, revise blower fan A arranged side by side, B exerts oneself, blower fan is exerted oneself and reaches balance, when deviation exerted oneself by the blower fan of two paired runnings, the present invention carries out load adjustment automatically by the computing of two Fans electric currents, the outlet blast reaching both sides blower fan is identical, load is identical, reduce the surge probability of blower fan.
Description
Technical field
The present invention relates to a kind of controlling method eliminating axial-flow blower surge.
Background technique
Thermoelectricity generator set occupies critical role in China's electrical production, and axial-flow blower is one of main equipment in power plant auxiliary machine, and it is related to unit safety, reliable, stable operation.But axial fan has hump shape performance curve, there is unstable operation district in this characteristic, so axial-flow blower is not under any circumstance can stably work, when operation point moves to the significantly pulsation that the flow of blower fan, pressure head and power just may appear in unstable operation district, blower fan and pipeline can produce strong vibration, the abnormal operating modes such as noise significantly increases, this unstable condition region is called surge area.Prevent the generation of axial-flow blower surge, become a major issue in unit safety operation.
In FIG, when blower fan works at K point right side (as A point), the working state of blower fan can the change of automatically adaptive system, the work of all-the-time stable ground.The region on usual title K point right side is the stable work area of blower fan, if system causes resistance to raise because of certain reason, operating point moves to B point after crossing K point, now blower fan produce pressure time height time low, during flow, timing is born, in system there is very large fluctuation in the pressure of gas and flow, the air-flow produced due to flowed fluctuation clashes, blower fan can be made to produce strong vibration, noise increases severely simultaneously, the phenomenon of this instability is called as surge, and the region usually claiming K point left side is blower fan unstable operation district.
Summary of the invention
Surge is there is and analyzes in the present invention under there is the unmatched situation of load mainly for power station paired running blower fan, blast is exported equal when blower fan arranged side by side normally runs, but due to entering of air quantity system, outlet damper location is inaccurate, mounting process, the problems such as system performance can make to exert oneself when same instructions not identical, thus cause blower fan electric current, outlet blast has deviation, the characteristic curve of fan peak point making load little produces skew, its operation point is just easily dropped on K point left side thus is entered surge area, so, when regulating the load of blower fan, the unsuitable deviation of exerting oneself of two blower fans arranged side by side is excessive, unstable surge area is entered to prevent low-load blower fan.
For achieving the above object, concrete scheme of the present invention is as follows:
Eliminate a controlling method for axial-flow blower surge, comprise the following steps:
Step one: the electric current of blower fan A and blower fan B is sent into the first subtractor, obtains the current deviation of blower fan A and blower fan B;
Step 2: current deviation step one obtained sends into absolute value block, what absolute value block exported limits module on the occasion of being sent to height, simultaneously, the current deviation that step one obtains is sent to function f (x), when function f (x) has output value, function f (x) output value is sent to controller and carries out proportional integral (PI) calculating, result of calculation is delivered to amplitude limiter by controller, and amplitude limiter is connected with switch first pin;
Step 3: the second pin of described switch is connected with by the manually operated manual bias device of operations staff, and the 3rd pin of switch module is connected with logical AND module;
When switch the 3rd pin is logical truth, numerical value is sent to switch by the first pin of switch by the output of amplitude limiter, when the 3rd pin of switch is logical falsehood, operations staff manually operates and numerical value is sent to switch by the second pin of switch;
Step 4: switch the 3rd pin is that logical truth or operations staff manually operate when numerical value is sent to switch by the second pin of switch, current deviation is finally sent to adder and the second subtractor through the value that controller and amplitude limiter calculate, the output order of the blower fan making output current large by adder reduces, the output order of the blower fan making output current little by the second subtractor increases, the outlet blast of balance blower fan A and blower fan B, makes operation point enter into stable region from range of instability.
Described function f (x) is a piecewise function, and it has a dead band, and dead zone range is 2% of blower fan rated current, and exceeding dead band is linear change region.
Function f (x) is when current deviation is less than 2% of input blower fan rated current, and it is zero that f (x) exports, when being greater than 2% of input blower fan rated current, export as linear function, the absolute value of f (x)=kx+b, k is between 0-1, b is constant, and x is current deviation.
Described amplitude limiter be limited to 5% of the maximum instruction of blower fan up and down.
Described switch module first pin and the second pin are all represent numerical quantities input, and the 3rd pin of switch module is logical truth or logical false signal input.
Described switch the 3rd pin is the condition of logical truth: export as logical truth, operations staff manually throw move back as logical truth for logical truth, side by side blower fan run automatically through time delay block when high limit module exports, export as logical truth through logical AND module when above-mentioned three conditions meet simultaneously, otherwise switch the 3rd pin is logical falsehood.
Beneficial effect of the present invention:
When deviation exerted oneself by the blower fan of two paired runnings, computing by two Fans electric currents carries out load adjustment automatically, the outlet blast reaching both sides blower fan is identical, load is identical, reduce the surge probability of blower fan, ensure that axial-flow blower normally works in stable work area, avoid the generation of infringement equipment and bearing accident, be conducive to the safe operation of boiler, improve monoblock reliability of operation, there is very large economic benefit.
Accompanying drawing explanation
The characteristic curve of Fig. 1 axial-flow blower and system performance curve;
Fig. 2 system principle diagram of the present invention;
Fig. 3 system flow chart of the present invention;
Fig. 4 embodiment of the method schematic diagram of the present invention.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in detail:
This system designs based on decentralized control system, and specific works process is as follows, as Fig. 2:
The blower fan A of paired running, blower fan B, under auto state, along with the change of load, two Fans enter nonlinear operation district, can cause the difference of exerting oneself of two Fans like this.
(1) when blower fan A exert oneself load be greater than blower fan B exert oneself load time, A blower fan is exerted oneself increase, mutually deserved A fan outlet blast can increase, electric current also can increase, blower fan A and blower fan B electric current just have deviation, by the first subtractor, the negative deviation produced is sent to absolute value block, output on the occasion of being sent to high limit module.Electric current negative deviation is sent to function f (x) simultaneously, function f (x) has a dead band, if electric current negative deviation exceedes this dead band, function f (x) will produce an output, and be sent to controller to calculate, produce the output of a negative value, controller is sent to result of calculation inside amplitude limiter, and the upper and lower of amplitude limiter is generally 5% of the maximum instruction of blower fan.Switch module is given in the output of amplitude limiter, switch module pin 1,2 is all represent numerical quantities input, pswitch pin 3 is logical truth or logical false signal input, whether representative meets current balance type function is dropped into condition, the logical condition that pswitch pin 3 produces: export as logical truth, operations staff manually throw and move back as logical truth for logical truth, side by side blower fan run automatically through time delay block when high limit module exports, export as logical truth through logical AND module when above-mentioned three conditions meet simultaneously, then output logic is false for other.When pswitch pin 3 is logical truth, numerical value is sent to switching soon by pin 1 by the output of amplitude limiter, and when pin 3 is logical falsehood, operations staff manually operates and numerical value is sent to switching soon by pin 2.When pswitch pin 3 is logical truth, current deviation is finally sent to adder Module and adder 2 module through the negative value calculated, by adder, the output order of blower fan A is reduced, by the second subtractor, the output order of blower fan B is increased, thus reduce the load of exerting oneself of blower fan A, increase the load of exerting oneself of blower fan B, the outlet blast of balance blower fan A and blower fan B, makes operation point enter into stable region from range of instability.
(2) when blower fan B exert oneself load be greater than blower fan A exert oneself load time, B blower fan is exerted oneself increase, mutually deserved B fan outlet blast can increase, electric current also can increase, blower fan A and blower fan B electric current just have deviation, by the first subtractor, the overgauge produced is sent to absolute value block, output on the occasion of being sent to high limit module.Electric current overgauge is sent to function f (x) simultaneously, function f (x) has a dead band, if electric current overgauge exceedes this dead band, function f (x) will produce an output, and be sent to controller to calculate, produce one on the occasion of output, controller is sent to result of calculation inside amplitude limiter, and the upper and lower of amplitude limiter is generally 5% of the maximum instruction of blower fan.Switch module is given in the output of amplitude limiter, switch module pin 1,2 is all represent numerical quantities input, pswitch pin 3 is logical truth or logical false signal input, whether representative meets current balance type function is dropped into condition, the logical condition that pswitch pin 3 produces: export as logical truth, operations staff manually throw and move back as logical truth for logical truth, side by side blower fan run automatically through time delay block when high limit module exports, export as logical truth through logical AND module when above-mentioned three conditions meet simultaneously, then output logic is false for other.When pswitch pin 3 is logical truth, numerical value is sent to switching soon by pin 1 by the output of amplitude limiter, and when pin 3 is logical falsehood, operations staff manually operates and numerical value is sent to switching soon by pin 2.When pswitch pin 3 is logical truth, current deviation through calculating on the occasion of being finally sent to adder Module and adder 2 module, by adder, the output order of blower fan A is increased, by the second subtractor, the output order of blower fan B is reduced, thus reduce the load of exerting oneself of blower fan B, increase the load of exerting oneself of blower fan A, the outlet blast of balance blower fan A and blower fan B, makes operation point enter into stable region from range of instability.
Be greater than blower fan B load of exerting oneself be described, as Fig. 3 for blower fan A load of exerting oneself.
Blower fan A exert oneself load be greater than blower fan B exert oneself load time, blower fan A electric current is greater than blower fan B electric current, and blower fan A and blower fan B electric current just have deviation, by the first subtractor, the negative deviation produced is sent to absolute value block, output on the occasion of being sent to high limit module.Electric current negative deviation is sent to function f (x) simultaneously, and function f (x) has a dead band, in the diagram the t1 moment, and now current deviation is in the dead band of f (x), and f (x) does not export.The t2 moment, current deviation has exceeded dead band, function f (x) will produce an output, and be sent to controller to calculate, produce the output of a negative value, as Fig. 4, correction value can reduce, controller is sent to result of calculation inside amplitude limiter, and the upper and lower of amplitude limiter is generally 5% of the maximum instruction of blower fan.Switch module is given in the output of amplitude limiter, if when now pswitch pin 3 is logical truth, current deviation is finally sent to adder Module and adder 2 module through the correction value calculated, due to the reduction of correction value, by adder, the output order of blower fan A is reduced, by the second subtractor, the output order of blower fan B is increased, thus reduce the load of exerting oneself of blower fan A, increase the load of exerting oneself of blower fan B, the outlet blast of balance blower fan A and blower fan B, makes operation point enter into stable region from range of instability.
Claims (4)
1. eliminate a controlling method for axial-flow blower surge, it is characterized in that,
Step one: the electric current of blower fan A and blower fan B is sent into the first subtractor, obtains the current deviation of blower fan A and blower fan B;
Step 2: current deviation step one obtained sends into absolute value block, what absolute value block exported limits module on the occasion of being sent to height, simultaneously, the current deviation that step one obtains is sent to function f (x), when function f (x) has output value, function f (x) output value is sent to controller and carries out proportional integral (PI) calculating, result of calculation is delivered to amplitude limiter by controller, and amplitude limiter is connected with switch first pin;
Step 3: the second pin of described switch is connected with by the manually operated manual bias device of operations staff, and the 3rd pin of switch module is connected with logical AND module;
When switch the 3rd pin is logical truth, numerical value is sent to switch by the first pin of switch by the output of amplitude limiter, when the 3rd pin of switch is logical falsehood, operations staff manually operates and numerical value is sent to switch by the second pin of switch;
Described switch the 3rd pin is the condition of logical truth: export as logical truth, operations staff manually throw move back as logical truth for logical truth, side by side blower fan run automatically through time delay block when high limit module exports, export as logical truth through logical AND module when three conditions meet simultaneously, otherwise switch the 3rd pin is logical falsehood;
Step 4: switch the 3rd pin is that logical truth or operations staff manually operate when numerical value is sent to switch by the second pin of switch, current deviation is finally sent to adder and the second subtractor through the value that controller and amplitude limiter calculate, the output order of the blower fan making output current large by adder reduces, the output order of the blower fan making output current little by the second subtractor increases, the outlet blast of balance blower fan A and blower fan B, makes operation point enter into stable region from range of instability.
2. a kind of controlling method eliminating axial-flow blower surge as claimed in claim 1, is characterized in that, described function f (x) is a piecewise function, and it has a dead band, and dead zone range is 2% of blower fan rated current, and exceeding dead band is linear change region.
3. a kind of controlling method eliminating axial-flow blower surge as claimed in claim 1, is characterized in that, described amplitude limiter be limited to 5% of the maximum instruction of blower fan up and down.
4. a kind of controlling method eliminating axial-flow blower surge as claimed in claim 1, is characterized in that, described switch module first pin and the second pin are all represent numerical quantities input, and the 3rd pin of switch module is logical truth or logical false signal input.
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Families Citing this family (8)
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| CN104533818B (en) * | 2014-12-22 | 2016-09-07 | 大唐贵州发耳发电有限公司 | A kind of parallel fan automatic adjusting balance control system |
| CN104848253A (en) * | 2015-05-13 | 2015-08-19 | 国家电网公司 | Method and device for air capacity control of thermal power generating unit applicable to low nitrogen oxide emission and air capacity control system |
| CN105386992A (en) * | 2015-12-08 | 2016-03-09 | 国网山东省电力公司电力科学研究院 | Optimal control system based on draught fan power output dynamic balance and method |
| CN106861407B (en) * | 2017-02-27 | 2019-09-06 | 上海龙净环保科技工程有限公司 | It is a kind of for avoiding the blower of paired running from tacking the control method of phenomenon |
| CN107270472B (en) * | 2017-06-05 | 2019-10-15 | 广东美的暖通设备有限公司 | Method for controlling number of revolution, revolution speed control system and air-conditioning |
| CN109340162B (en) * | 2018-11-26 | 2020-04-14 | 贵州金元茶园发电有限责任公司 | System and method for preventing primary fan of thermal power generating unit from stalling and blowing out |
| CN109973408B (en) * | 2019-03-26 | 2020-12-29 | 大唐桂冠合山发电有限公司 | Method for recovering abnormal adjustment of movable blade of air blower with adjustable movable blade |
| CN110043497B (en) * | 2019-04-03 | 2020-09-01 | 华能淮阴第二发电有限公司 | Early warning method and system for automatic adjustment fault of fan |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6320405A (en) * | 1986-07-14 | 1988-01-28 | Nippon Steel Corp | Skirt control method for converter waste gas treatment device |
| CN101482127A (en) * | 2008-01-08 | 2009-07-15 | 北京博奇电力科技有限公司 | Parallel operation optimizing control method and system of booster fan |
| CN101545495A (en) * | 2008-03-26 | 2009-09-30 | 上海宝信软件股份有限公司 | Device and method for controlling anti-surging of a blast blower |
| CN102619774A (en) * | 2012-04-19 | 2012-08-01 | 江苏乘帆压缩机有限公司 | Surge control method of centrifugal compression equipment |
| US8341972B2 (en) * | 2006-12-20 | 2013-01-01 | Lg Electronics Inc. | Drive control apparatus and method for refrigerator type fan motor |
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102009004376B4 (en) * | 2009-01-12 | 2016-06-16 | Man Diesel & Turbo Se | Method and system for controlling a turbocompressor network |
-
2014
- 2014-03-31 CN CN201410126530.0A patent/CN103883551B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6320405A (en) * | 1986-07-14 | 1988-01-28 | Nippon Steel Corp | Skirt control method for converter waste gas treatment device |
| US8341972B2 (en) * | 2006-12-20 | 2013-01-01 | Lg Electronics Inc. | Drive control apparatus and method for refrigerator type fan motor |
| CN101482127A (en) * | 2008-01-08 | 2009-07-15 | 北京博奇电力科技有限公司 | Parallel operation optimizing control method and system of booster fan |
| CN101545495A (en) * | 2008-03-26 | 2009-09-30 | 上海宝信软件股份有限公司 | Device and method for controlling anti-surging of a blast blower |
| CN102619774A (en) * | 2012-04-19 | 2012-08-01 | 江苏乘帆压缩机有限公司 | Surge control method of centrifugal compression equipment |
| CN103423190A (en) * | 2013-08-28 | 2013-12-04 | 贵州电力试验研究院 | Parallel operation axial flow primary fan automatic regulating method and device |
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