CN103883551A - Control method for eliminating surge of axial flow fans - Google Patents
Control method for eliminating surge of axial flow fans Download PDFInfo
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- CN103883551A CN103883551A CN201410126530.0A CN201410126530A CN103883551A CN 103883551 A CN103883551 A CN 103883551A CN 201410126530 A CN201410126530 A CN 201410126530A CN 103883551 A CN103883551 A CN 103883551A
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Abstract
The invention discloses a control method for eliminating the surge of axial flow fans. The control method includes the steps that the current of the first fan A and the current of the second fan B are input into a first subtracter to acquire the current deviation of the first fan A and the second fan B; the acquired current deviation is input into an absolute value module; a positive value output by the absolute value module is input into a high limit module, and meanwhile the acquired current deviation is substituted into a function f(x); when an output value of the function f(x) exists, the output value of the function f(x) is input into a controller; after calculation, the output of the fan A and the output of the fan B parallel to the fan A are corrected to balance the output of the fan A and the output of the fan B. By means of the control method, when the output of one fan deviates from the output of the other fan operating in parallel to the former fan, load adjustment can be automatically carried out through the calculation of the currents of the two fans so as to make the two fans on two sides equal in outlet air pressure and load, and therefore the surge probability of the fans can be reduced.
Description
Technical field
The present invention relates to a kind of controlling method of 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 being related to unit safety, reliable, stable operation.But axial fan has hump shape performance curve, there is unstable operation district in this specific character, so axial-flow blower is not under any circumstance can stably work, when operation point moves to the significantly pulsation that flow, pressure head and the power of blower fan just may appear in unstable operation district, blower fan and pipeline can produce strong vibration, the undesired operating modes such as noise significantly increases, this unstable period district is called surge area.Prevent the generation of axial-flow blower surge, become a major issue in unit safety operation.
In Fig. 1, when blower fan is in the time that K point right side (as A point) works, the working state of blower fan is the variation of adaptive system automatically, the work of all-the-time stable ground.Conventionally the stable work area that the region that claims K point right side is blower fan, if system raises because certain reason causes resistance, operating point moves to B point after crossing K point, low when high when pressure that now blower fan produces, when flow, timing is negative, in system there is very large fluctuation in the pressure of gas and flow, the air-flow producing due to flowed fluctuation clashes, can make blower fan produce strong vibration, noise increases severely simultaneously, this unsettled phenomenon is called as surge, conventionally claims that the region in K point left side is blower fan unstable operation district.
Summary of the invention
The present invention occurs that mainly for power station paired running blower fan in the unmatched situation of load, surge occurring analyzes, when blower fan normally moves side by side, exporting blast equates, 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 in the situation of same instructions not identical, thereby cause blower fan electric current, outlet blast has deviation, make the characteristic curve of fan peak point of loading little produce skew, thereby its operation point is just easily dropped on K point left side and is entered surge area, so, while regulating the load of blower fan, the unsuitable deviation of exerting oneself of two blower fans arranged side by side is excessive, to prevent that low-load blower fan from entering unsettled surge area.
For achieving the above object, concrete scheme of the present invention is as follows:
A controlling method of eliminating axial-flow blower surge, comprises the following steps:
Step 1: 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;
Step 2: the current deviation that step 1 is obtained is sent into absolute value block, what absolute value block was exported limits module on the occasion of being sent to height, simultaneously, the current deviation that step 1 obtains is sent to function f (x), in the time that 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 the first pin;
Step 3: the second pin of described switch be connected by the manually operated manual bias device of operations staff, the 3rd pin of switch module is connected with logical AND module;
In the time that switch the 3rd pin is logical truth, the output of amplitude limiter is sent to switch by the first pin of switch by numerical value, in the time that the 3rd pin of switch is logical falsehood, operations staff is sent to switch by numerical value by the second pin of switch by manually-operable;
Step 4: switch the 3rd pin is that logical truth or operations staff are while being sent to switch by numerical value by the second pin of switch by manually-operable, the value that current deviation process controller and amplitude limiter calculate is finally sent to adder and the second subtractor, by adder, the output order of the blower fan that output current is large is reduced, by the second subtractor, the output order of the blower fan that output current is little is increased, 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) current deviation be less than input blower fan rated current 2% time, f (x) is output as zero, be greater than input blower fan rated current 2% time, be output as linear function, f (x)=kx+b, the absolute value of k is between 0-1, b is constant, and x is current deviation.
Described amplitude limiter be limited to up and down 5% of the maximum instruction of blower fan.
Described switch module the first pin and the second pin are all to represent numerical quantities input, and the 3rd pin of switch module is logical truth or the input of logical falsehood signal.
The condition that described switch the 3rd pin is logical truth is: when high limit module be output as logical truth, side by side blower fan automatically operation through time delay piece be output as logical truth, operations staff manually throws and moves back as logical truth, when meeting simultaneously, above-mentioned three conditions are output as logical truth through logical AND module, otherwise switch the 3rd pin is logical falsehood.
Beneficial effect of the present invention:
In the time that the blower fan of two paired runnings has been exerted oneself deviation, can automatically carry out load adjustment by the computing of two Fans electric currents, the outlet blast that reaches both sides blower fan is identical, it is identical to load, reduce the surge probability of blower fan, assurance axial-flow blower is normally worked in stable work area, has avoided the generation of infringement equipment and bearing accident, is 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:
Blower fan A, the blower fan B of paired running, under auto state, along with the variation of load, two Fans enter nonlinear operation district, can cause like this difference of exerting oneself of two Fans.
(1) when the blower fan A load of exerting oneself is greater than blower fan B and exerts oneself when load, the increase of exerting oneself of A blower fan, 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 producing 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 being sent to controller calculates, produce the output of a negative value, controller is sent to amplitude limiter the inside result of calculation, 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 to represent numerical quantities input, pswitch pin 3 is logical truth or the input of logical falsehood signal, whether representative meets current balance type function is dropped into condition, the logical condition that pswitch pin 3 produces: when high limit module be output as logical truth, side by side blower fan automatically operation through time delay piece be output as logical truth, operations staff manually throws and moves back as logical truth, when meeting simultaneously, above-mentioned three conditions are output as logical truth, other output logic vacations through logical AND module.In the time that pswitch pin 3 is logical truth, the output of amplitude limiter is sent to numerical value to switch soon by pin 1, and in the time that pin 3 is logical falsehood, operations staff is sent to numerical value to switch soon by pin 2 by manually-operable.In the situation that pswitch pin 3 is logical truth, current deviation is finally sent to adder Module and adder 2 modules through the negative value calculating, by adder, the output order of blower fan A is reduced, by the second subtractor, the output order of blower fan B is increased, thereby reduce the load of exerting oneself of blower fan A, the load of exerting oneself that increases 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 the blower fan B load of exerting oneself is greater than blower fan A and exerts oneself when load, the increase of exerting oneself of B blower fan, 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 producing 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 being sent to controller calculates, produce one on the occasion of output, controller is sent to amplitude limiter the inside result of calculation, 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 to represent numerical quantities input, pswitch pin 3 is logical truth or the input of logical falsehood signal, whether representative meets current balance type function is dropped into condition, the logical condition that pswitch pin 3 produces: when high limit module be output as logical truth, side by side blower fan automatically operation through time delay piece be output as logical truth, operations staff manually throws and moves back as logical truth, when meeting simultaneously, above-mentioned three conditions are output as logical truth, other output logic vacations through logical AND module.In the time that pswitch pin 3 is logical truth, the output of amplitude limiter is sent to numerical value to switch soon by pin 1, and in the time that pin 3 is logical falsehood, operations staff is sent to numerical value to switch soon by pin 2 by manually-operable.In the situation that pswitch pin 3 is logical truth, current deviation through calculating on the occasion of being finally sent to adder Module and adder 2 modules, by adder, the output order of blower fan A is increased, by the second subtractor, the output order of blower fan B is reduced, thereby reduce the load of exerting oneself of blower fan B, the load of exerting oneself that increases 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 the blower fan B load of exerting oneself and describe as example take the blower fan A load of exerting oneself, as Fig. 3.
The blower fan A load of exerting oneself is greater than blower fan B and exerts oneself when load, and 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 producing are 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, and in the t1 moment in Fig. 4, 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 being sent to controller calculates, the output that produces a negative value, as Fig. 4, correction value can reduce, controller is sent to amplitude limiter the inside result of calculation, 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 modules through the correction value calculating, due to reducing 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, thereby 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 (5)
1. a controlling method of eliminating axial-flow blower surge, is characterized in that,
Step 1: 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;
Step 2: the current deviation that step 1 is obtained is sent into absolute value block, what absolute value block was exported limits module on the occasion of being sent to height, simultaneously, the current deviation that step 1 obtains is sent to function f (x), in the time that 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 the first pin;
Step 3: the second pin of described switch be connected by the manually operated manual bias device of operations staff, the 3rd pin of switch module is connected with logical AND module;
In the time that switch the 3rd pin is logical truth, the output of amplitude limiter is sent to switch by the first pin of switch by numerical value, in the time that the 3rd pin of switch is logical falsehood, operations staff is sent to switch by numerical value by the second pin of switch by manually-operable;
Step 4: switch the 3rd pin is that logical truth or operations staff are while being sent to switch by numerical value by the second pin of switch by manually-operable, the value that current deviation process controller and amplitude limiter calculate is finally sent to adder and the second subtractor, by adder, the output order of the blower fan that output current is large is reduced, by the second subtractor, the output order of the blower fan that output current is little is increased, 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 of 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 of eliminating axial-flow blower surge as claimed in claim 1, is characterized in that, described amplitude limiter be limited to up and down 5% of the maximum instruction of blower fan.
4. a kind of controlling method of eliminating axial-flow blower surge as claimed in claim 1, is characterized in that, described switch module the first pin and the second pin are all to represent numerical quantities input, and the 3rd pin of switch module is logical truth or the input of logical falsehood signal.
5. a kind of controlling method of eliminating axial-flow blower surge as claimed in claim 1, it is characterized in that, the condition that described switch the 3rd pin is logical truth is: when high limit module be output as logical truth, side by side blower fan automatically operation through time delay piece be output as logical truth, operations staff manually throws and moves back as logical truth, when meeting simultaneously, above-mentioned three conditions are output as logical truth through logical AND module, otherwise switch the 3rd pin is logical falsehood.
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104533818A (en) * | 2014-12-22 | 2015-04-22 | 大唐贵州发耳发电有限公司 | Automatic balance adjusting control system of parallel draught fans |
| 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 |
| CN106861407A (en) * | 2017-02-27 | 2017-06-20 | 上海龙净环保科技工程有限公司 | A kind of blower fan for avoiding paired running tacks the control method of phenomenon |
| CN107270472A (en) * | 2017-06-05 | 2017-10-20 | 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 |
| CN109340162A (en) * | 2018-11-26 | 2019-02-15 | 贵州金元茶园发电有限责任公司 | It prevents fired power generating unit primary air fan stall from tacking and causes flame-out system and method |
| CN109973408A (en) * | 2019-03-26 | 2019-07-05 | 大唐桂冠合山发电有限公司 | The abnormal restoration methods of the movable vane adjustment of adjusting rotor blade section formula pressure fan |
| CN110043497A (en) * | 2019-04-03 | 2019-07-23 | 华能淮阴第二发电有限公司 | A kind of blower automatic adjustment fault early warning method and system |
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| CN109340162A (en) * | 2018-11-26 | 2019-02-15 | 贵州金元茶园发电有限责任公司 | It prevents fired power generating unit primary air fan stall from tacking and causes flame-out system and method |
| CN109973408A (en) * | 2019-03-26 | 2019-07-05 | 大唐桂冠合山发电有限公司 | The abnormal restoration methods of the movable vane adjustment of adjusting rotor blade section formula pressure fan |
| CN110043497A (en) * | 2019-04-03 | 2019-07-23 | 华能淮阴第二发电有限公司 | A kind of blower automatic adjustment fault early warning method and system |
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