CN110578051B - Control method of smoke exhaust fan of continuous annealing furnace - Google Patents
Control method of smoke exhaust fan of continuous annealing furnace Download PDFInfo
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- CN110578051B CN110578051B CN201910831974.7A CN201910831974A CN110578051B CN 110578051 B CN110578051 B CN 110578051B CN 201910831974 A CN201910831974 A CN 201910831974A CN 110578051 B CN110578051 B CN 110578051B
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- 239000000779 smoke Substances 0.000 title claims abstract description 98
- 238000000137 annealing Methods 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000005070 sampling Methods 0.000 claims description 28
- 238000001914 filtration Methods 0.000 claims description 21
- 230000010354 integration Effects 0.000 claims description 21
- 238000012545 processing Methods 0.000 claims description 12
- 238000004590 computer program Methods 0.000 claims description 4
- 238000003860 storage Methods 0.000 claims description 3
- 239000007789 gas Substances 0.000 description 77
- 230000001276 controlling effect Effects 0.000 description 25
- 239000002912 waste gas Substances 0.000 description 10
- 230000008901 benefit Effects 0.000 description 6
- 238000002485 combustion reaction Methods 0.000 description 6
- 238000005259 measurement Methods 0.000 description 6
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000010355 oscillation Effects 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 238000005097 cold rolling Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000011160 research Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D1/00—General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
- C21D1/26—Methods of annealing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D11/00—Process control or regulation for heat treatments
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/52—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for wires; for strips ; for rods of unlimited length
- C21D9/54—Furnaces for treating strips or wire
- C21D9/56—Continuous furnaces for strip or wire
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D27/00—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids
- F04D27/004—Control, e.g. regulation, of pumps, pumping installations or pumping systems specially adapted for elastic fluids by varying driving speed
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Abstract
The invention discloses a control method of a smoke exhaust fan of a continuous annealing furnace, which comprises the following steps: acquiring a set value SV of the pressure of a gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace; comparing the set value SV of the pressure of the gas collection chamber with the actual value X of the pressure of the gas collection chamber to form a deviation YEn; inputting the deviation YEn into a PI controller to obtain a rotating speed control quantity Yn; and controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn. The invention solves the technical problems that the operation of a smoke exhaust fan is extremely unstable due to large fluctuation of the pressure of a gas collection chamber in a short time and the motor is damaged due to long-time operation in the prior art.
Description
Technical Field
The invention relates to the technical field of cold rolling, in particular to a control method of a smoke exhaust fan of a continuous annealing furnace.
Background
The strip steel is heated in the continuous annealing furnace through the combustion of fuel, and waste gas generated by the combustion is discharged to a waste gas collecting pipeline and enters a gas collecting chamber. The pressure of the gas collection chamber of the continuous annealing furnace is controlled by the rotating speed of the smoke exhaust fan, and due to the influence of factors such as the production line speed, the furnace temperature, the furnace pressure and the like, the fluctuation of the pressure of the gas collection chamber is large in a short time, so that the operation of the smoke exhaust fan is extremely unstable, the motor can be damaged due to the long-time unstable operation, and the smoke exhaust fan of the continuous annealing furnace is burnt out for several times in one year.
Disclosure of Invention
The embodiment of the application provides a control method of a smoke exhaust fan of a continuous annealing furnace, and solves the technical problems that in the prior art, the fluctuation of the pressure of a gas collection chamber is large in a short time, the operation of the smoke exhaust fan is extremely unstable, and a motor is damaged due to long-time operation.
In a first aspect, the present application provides the following technical solutions through an embodiment of the present application:
a control method of a smoke exhaust fan of a continuous annealing furnace comprises the following steps: acquiring a set value SV of the pressure of a gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace; comparing the set value SV of the pressure of the gas collection chamber with the actual value X of the pressure of the gas collection chamber to form a deviation YEn; inputting the deviation YEn into a PI controller to obtain a rotating speed control quantity Yn; and controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn.
In one embodiment, the inputting the deviation YEn to the PI controller to obtain a rotation speed control quantity Yn includes: determining a proportional coefficient Kp and an integral time TN of the PI controller according to the actual value X of the pressure of the gas collection chamber, wherein the proportional coefficient Kp and the integral time TN respectively correspond to the actual value X of the pressure of the gas collection chamber; and inputting the deviation YEn to the PI controller, and adjusting the rotating speed control quantity Yn output by the PI controller according to the proportional coefficient Kp and the integral time TN to realize stable adjustment of the smoke exhaust fan.
In one embodiment, the determining the proportional coefficient Kp and the integration time TN of the PI controller according to the actual value X of the plenum pressure comprises: when the actual value X of the plenum pressure is greater than or equal to the upper limit M of the pressure value, the proportionality coefficient Kp is 0.75, and the integration time TN is 5 seconds; when the actual value X of the plenum pressure is smaller than or equal to the lower limit N of the pressure value, the proportionality coefficient Kp is 0.3, and the integration time TN is 13 seconds; when the actual value X of the plenum pressure is larger than the lower limit of the pressure value and smaller than the upper limit of the pressure value, the proportionality coefficient Kp is 0.00045X-0.15, and the integration time TN is-0.008X + 21.
In one embodiment, the PI controller is specifically: yn is Y (n-1) + Kp [ (1+ TA/TN) × YEn-YE (n-1) ], wherein Yn is the rotating speed control quantity output by the PI controller in the current sampling period; y (n-1) is the rotating speed control quantity output by the PI controller in a sampling period; kp is a proportionality coefficient; TA is sampling time; TN is the integration time; YEn is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the current sampling period and the actual value X of the pressure of the gas collection chamber; YE (n-1) is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the last sampling period and the actual value X of the pressure of the gas collection chamber.
In one embodiment, before the comparing the set plenum pressure value SV with the actual plenum pressure value X, the method further comprises: and carrying out filtering processing on the actual value X of the plenum pressure.
In one embodiment, the filtering the actual plenum pressure value X includes: and (3) connecting the plenum pressure actual value X into a first-order filter Xn ═ a × Zn + (1-a) X (n-1) for first-order filtering to obtain the filtered plenum pressure actual value X, wherein: a is a filter coefficient and takes a value between 0.1 and 0.15; zn is the input value of a first-order filter; xn is the filtering output value of the current sampling period of the first-order filter; x (n-1) is the filtered output value of the last sampling period of the first-order filter.
In one embodiment, said inputting said deviation YEn to a PI controller comprises: when the deviation YEn is greater than or equal to a positive limit value LU, controlling the input of the PI controller to be equal to the positive limit value LU; when the deviation YEn is less than or equal to a negative limit value LL, controlling the input of a PI controller to be equal to the negative limit value LL; controlling an input of a PI controller to be equal to the deviation YEn when the deviation YEn is less than the positive limit LU and greater than the negative limit LL, wherein the positive limit LU and the negative limit LL are one-third of the plenum pressure set point SV.
In one embodiment, the controlling the rotation speed of the smoke exhaust fan by the rotation speed control amount Yn includes: when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is greater than or equal to a preset rotating speed upper limit value, controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed upper limit value; when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than or equal to a preset rotating speed lower limit value, controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed lower limit value; and when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than the preset rotating speed upper limit value and larger than the preset rotating speed lower limit value, controlling the rotating speed output value of the smoke exhaust fan to be the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn.
In a second aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment of the present application:
a control system of a smoke exhaust fan of a continuous annealing furnace comprises: the acquisition module is used for acquiring a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace; the comparison module is used for comparing the set value SV of the plenum pressure with the actual value X of the plenum pressure to form a deviation YEn; the input module is used for inputting the deviation YEn into the PI controller to obtain a rotating speed control quantity Yn; and the control module is used for controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn.
In a third aspect, based on the same inventive concept, the present application provides the following technical solutions through an embodiment of the present application:
a computer storage medium having a computer program stored thereon, comprising: which when executed by a processor may carry out the method steps as described in any of the embodiments above.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the scheme is that YEn deviation between a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber is obtained; processing the input deviation YEn by using a PI controller to obtain a rotating speed control quantity Yn; through rotational speed control volume Yn is right smoke exhaust fan's rotational speed is controlled, because the fluctuation is great in the plenum chamber ressure measurement point short time, and the system operation requirement is steady as far as possible, so adopt the PI controller to carry out speed control, the overshoot phenomenon appears when avoiding appearing great interference, introduce feedback control through P, I simultaneously, realize the steady regulation of rotational speed, avoid smoke exhaust fan's rotational speed to neglect high and suddenly low, the operation is extremely unstable, it is great to have solved plenum chamber pressure short time fluctuation, cause smoke exhaust fan operation extremely unstable, long-time operation can cause the technical problem of motor damage.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for controlling a smoke exhaust fan of a continuous annealing furnace according to a preferred embodiment of the present application;
FIG. 2 is a graph of a prior art operating curve during a failure of a smoke exhaust fan;
FIG. 3 is a schematic diagram of the P control function of the PI controller of the exhaust fan in the preferred embodiment of the present application;
FIG. 4 is a schematic diagram of the I control function of the PI controller of the exhaust fan in the preferred embodiment of the present application;
FIG. 5 is a schematic view of the operation of the smoke exhaust fan in the preferred embodiment of the present application;
FIG. 6 is a schematic structural diagram of a control system of a fume extractor of a continuous annealing furnace according to a preferred embodiment of the present application.
Detailed Description
The embodiment of the application provides a control method of a smoke exhaust fan of a continuous annealing furnace, and solves the technical problems that in the prior art, the fluctuation of the pressure of a gas collection chamber is large in a short time, the operation of the smoke exhaust fan is extremely unstable, and a motor is damaged due to long-time operation.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a control method of a smoke exhaust fan of a continuous annealing furnace comprises the following steps: acquiring a set value SV of the pressure of a gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace; comparing the set value SV of the pressure of the gas collection chamber with the actual value X of the pressure of the gas collection chamber to form a deviation YEn; inputting the deviation YEn into a PI controller to obtain a rotating speed control quantity Yn; and controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn. Because the fluctuation of gas collecting chamber pressure measurement point is great in the short time, and the system operation requirement is steady as far as possible, so adopt PI controller to carry out rotational speed control, the overshoot phenomenon appears when avoiding appearing great interference, introduce feedback control through P, I simultaneously, realize the steady regulation of rotational speed, avoid exhaust fan's rotational speed to neglect high suddenly low, it is extremely unstable to operate, it is great to have solved the fluctuation of gas collecting chamber pressure in the short time, cause exhaust fan operation extremely unstable, long-time operation can cause the technical problem of motor damage.
Example one
As shown in fig. 1, the present embodiment provides a method for controlling a smoke exhaust fan of a continuous annealing furnace, including:
s101: acquiring a set value SV of the pressure of a gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace; specifically, the set value SV of the gas collection chamber pressure is set to 1500 pa.
S102: comparing the set value SV of the pressure of the gas collection chamber with the actual value X of the pressure of the gas collection chamber to form a deviation YEn;
s103: inputting the deviation YEn into a PI controller to obtain a rotating speed control quantity Yn;
s104: and controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn.
The rotation speed control amount Yn is used to control the rotation speed of the exhaust fan, and may be a rotation speed or a control amount corresponding to the rotation speed.
A PI (proportional integral) controller, which is: the proportional-integral controller specifically refers to a controller containing two parameters of proportion P and integral I.
The inventor finds that the smoke exhaust fan of the continuous annealing line annealing furnace is burnt out for several times in one year, and finds that the curve of the smoke exhaust fan always generates continuous oscillation when a fault occurs after monitoring the operation curve of the smoke exhaust fan for many times, so that the relation between the fault and the speed fluctuation of the fan is inferred.
The scheme is that YEn deviation between a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber is obtained; processing the input deviation YEn by using a PI controller to obtain a rotating speed control quantity Yn; through rotational speed control volume Yn is right smoke exhaust fan's rotational speed is controlled, because the fluctuation is great in the plenum chamber ressure measurement point short time, and the system operation requirement is steady as far as possible, so adopt the PI controller to carry out rotational speed control, the overshoot phenomenon appears when avoiding appearing great interference, introduce feedback control through P, I simultaneously, realize the steady regulation of rotational speed, avoid smoke exhaust fan's rotational speed to be suddenly high and suddenly low, fluctuate greatly, the operation is extremely unstable. In addition, the stable operation of the smoke exhaust fan is controlled, so that the stability of the pressure of the gas collection chamber and the stability of the pressure of the gas collection chamber are ensured, the pressure stability of the radiant tube and the waste gas pipeline is directly influenced, the pressure of the gas collection chamber is stabilized, the stability of the pressure of the radiant tube and the waste gas pipeline is realized, the unstable combustion condition caused by the fluctuation of the pressure of the radiant tube and the waste gas pipeline is avoided, and the service life of the radiant tube is prolonged. According to statistics, the maintenance cost of the motor in a cold rolling plant within one year is as follows: the 5 ten thousand/3 times is 15 ten thousand, but the reason is only one factor, so the cost can be saved by only one time, namely 5 ten thousand yuan. After the invention is implemented, the service life of the radiant tube can be prolonged by about 1 month, and the working average of each radiant tube can be calculated by 4 years: the economic benefit can be obtained by about: 364 x 6 ten thousand (maintenance cost) 1/12 years/4 years-45.5 ten thousand, the total benefit is: 5+ 45.5-50.5 ten thousand yuan.
As an alternative embodiment, the inputting the deviation YEn to the PI controller to obtain a rotation speed control quantity Yn includes:
determining a proportional coefficient Kp and an integral time TN of the PI controller according to the actual value X of the pressure of the gas collection chamber, wherein the proportional coefficient Kp and the integral time TN respectively correspond to the actual value X of the pressure of the gas collection chamber;
and inputting the deviation YEn to the PI controller, and adjusting the rotating speed control quantity Yn output by the PI controller according to the proportional coefficient Kp and the integral time TN to realize stable adjustment of the smoke exhaust fan.
In addition, as shown in fig. 2, the solid line in the figure is an operation curve of the smoke exhaust fan, and the dotted line in the figure is a change curve of the pressure of the gas collecting chamber, and the inventor further finds out, through research and monitoring of the operation curve of the smoke exhaust fan, that the curve of the smoke exhaust fan generates a continuous oscillation rule when a fault occurs. During the preparation period of starting, the temperature of the furnace rises, the temperature of waste gas rises, so that the pressure rises, the numerical value of the pressure detection of the gas collection chamber fluctuates, the smoke exhaust fan immediately rises with a large slope and reaches a limit value, so that the pressure of the gas collection chamber is reduced to be low, when the pressure of the gas collection chamber reaches a certain lower limit value, the set speed of the fan is reduced with a large slope, so that the pressure rises, so that the pressure of the gas collection chamber is unstable, the speed of the fan jumps between the upper limit value and the lower limit value, the fan is extremely easy to overheat, the curve can be stable after being vibrated for a long time, and the inventor further determines that the fault is related.
According to the scheme, the proportional coefficient Kp and the integral time TN of the PI controller are corrected at any time according to different real-time gas collection chamber pressure actual values X, so that a model of the PI controller is changed to adapt to gas collection chamber pressure actual values X in different intervals, and when errors exist, a control system can be rapidly restored to a balanced state, and good stability is kept.
As an alternative embodiment, as shown in fig. 3 and 4, the determining the proportional coefficient Kp and the integration time TN of the PI controller according to the actual value X of the plenum pressure includes:
when the actual value X of the plenum pressure is greater than or equal to the upper limit M of the pressure value, the proportionality coefficient Kp is 0.75, and the integration time TN is 5 seconds;
when the actual value X of the plenum pressure is smaller than or equal to the lower limit N of the pressure value, the proportionality coefficient Kp is 0.3, and the integration time TN is 13 seconds;
when the actual value X of the plenum pressure is larger than the lower limit of the pressure value and smaller than the upper limit of the pressure value, the proportionality coefficient Kp is 0.00045X-0.15, and the integration time TN is-0.008X + 21.
Specifically, the upper limit M of the pressure value is-2000 pa, and the lower limit N of the pressure value is 1000 pa.
It should be noted that, here, the actual value X of the pressure in the gas collection chamber is divided into different intervals, and when the actual value X of the pressure in the gas collection chamber is located in an interval that is less than or equal to the lower limit N of the pressure value, or greater than or equal to the upper limit M of the pressure value, the proportional coefficient Kp and the integration time TN of the PI controller are kept constant, so that the PI control model is prevented from excessively amplifying the deviation YEn, and finally the output rotation speed control quantity Yn is overshot or exceeds a preset range value; when the actual value X of the pressure of the gas collection chamber is greater than the lower limit N of the pressure value and less than the upper limit M of the pressure value, the proportionality coefficient Kp and the integration time TN of the PI controller are adjusted according to the control functions as shown in fig. 3 and fig. 4, because the actual value X of the pressure of the gas collection chamber changes at any time, the deviation YEn from the set value SV of the pressure of the gas collection chamber changes at any time, and if the fixed proportionality coefficient Kp and the integration time TN are adopted, the output quantity, namely the rotating speed control quantity Yn of the PI controller is not appropriate, the rotating speed is possibly overshot, the system oscillation is caused, and the system cannot rapidly recover.
As an optional embodiment, the PI controller is: yn is Y (n-1) + Kp [ (1+ TA/TN) × YEn-YE (n-1) ], wherein Yn is the rotating speed control quantity output by the PI controller in the current sampling period; y (n-1) is the rotating speed control quantity output by the PI controller in a sampling period; kp is a proportionality coefficient; TA is sampling time; TN is the integration time, typically 1 s; YEn is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the current sampling period and the actual value X of the pressure of the gas collection chamber; YE (n-1) is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the last sampling period and the actual value X of the pressure of the gas collection chamber.
As an alternative embodiment, before the comparing the set plenum pressure value SV with the actual plenum pressure value X, the method further comprises:
and carrying out filtering processing on the actual value X of the plenum pressure.
As an alternative embodiment, the filtering process for the actual value X of the plenum pressure includes:
and (3) connecting the plenum pressure actual value X into a first-order filter Xn ═ a × Zn + (1-a) X (n-1) for first-order filtering to obtain the filtered plenum pressure actual value X, wherein: a is a filter coefficient and takes a value between 0.1 and 0.15; zn is the input value of a first-order filter; xn is the filtering output value of the current sampling period of the first-order filter; x (n-1) is the filtered output value of the last sampling period of the first-order filter.
In the practical implementation process, the fluctuation of an actual gas collection chamber pressure value X detected by a gas collection chamber pressure detection point is large, the influence factors are numerous, the acquired signal is very inaccurate, the acquired actual gas collection chamber pressure value X is accessed into the system, the first-order filtering treatment is carried out on the pressure value, and the stability of the measurement system is improved.
Specifically, the actual value X of the pressure of the gas collection chamber at the pressure detection point of the gas collection chamber is input from an IN port of a first-order filter, the filter coefficient a is input from a K port, and the pressure detection value X of the gas collection chamber obtained after filtering is output from an OUT port. According to practical experience, the a value ranges from 10% to 15%, and the system runs stably.
It should be noted that, in other embodiments of the first embodiment, the actual plenum pressure value X refers to the actual plenum pressure value X after the filtering process.
As an alternative embodiment, the inputting the deviation YEn to the PI controller includes:
when the deviation YEn is greater than or equal to a positive limit value LU, controlling the input of the PI controller to be equal to the positive limit value LU; when the deviation YEn is less than or equal to a negative limit value LL, controlling the input of a PI controller to be equal to the negative limit value LL; when the deviation YEn is less than the positive limit LU and greater than the negative limit LL, the input to the PI controller is controlled to be equal to the deviation YEn, wherein the positive limit LU and the negative limit LL are one third of the plenum pressure set point SV, i.e., the positive limit LU is 500pa and the negative limit LL is-500 pa.
In order to keep the stable operation of the rotating speed of the smoke exhaust fan, when the absolute value of the deviation YEn is overlarge, the input of the PI controller is controlled to be a positive limit LU and a negative limit LL respectively, and the phenomenon that the rotating speed control quantity Yn output by the PI controller fluctuates overlarge due to the fact that the overlarge deviation YEn is input into the PI controller, so that the rotating speed of the smoke exhaust fan fluctuates greatly, and the operation machine is unstable is avoided.
As an alternative embodiment, the controlling the rotation speed of the smoke exhaust fan by the rotation speed control amount Yn includes:
judging whether the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is greater than or equal to a preset rotating speed upper limit value or not, if so, controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed upper limit value;
judging whether the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than or equal to a preset rotating speed lower limit value or not, and if so, controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed lower limit value;
and judging that the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than the preset rotating speed upper limit value and larger than the preset rotating speed lower limit value, if so, controlling the rotating speed output value of the smoke exhaust fan to be the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn.
Specifically, the lower limit value of the preset rotating speed is 10% of the rated rotating speed of the smoke exhaust fan, and wind is guaranteed to be sent out; the upper limit value of the preset rotating speed is 90% of the rated rotating speed of the smoke exhaust fan, and motor aging acceleration caused by full-load operation of the smoke exhaust fan is avoided.
As shown in fig. 5, the specific working process of this embodiment is as follows: air gets into from combustion fan air intake 10, combustion fan 9 sends the air into radiant tube 7 in the annealing stove 6 in through combustion fan pipeline 8, mix burning with coal gas, the heat that the burning produced heats belted steel in the annealing stove, the waste gas that the burning produced discharges waste gas collecting pipe 1, get into collection chamber 2, gas collection chamber pressure check point 3 detects the interior waste gas pressure of gas collection chamber, according to the collection chamber pressure actual value X that detects, adjust the control parameter value of smoke exhaust fan PI controller, include: and the regulated PI controller controls the rotating speed of the smoke exhaust fan 4 according to the actual value X of the pressure of the gas collection chamber, and the waste gas is discharged from the gas collection chamber through the exhaust port 5 of the smoke exhaust fan.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the scheme is that YEn deviation between a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber is obtained; processing the input deviation YEn by using a PI controller to obtain a rotating speed control quantity Yn; through rotational speed control volume Yn is right smoke exhaust fan's rotational speed is controlled, because the fluctuation is great in the plenum chamber ressure measurement point short time, and the system operation requirement is steady as far as possible, so adopt the PI controller to carry out speed control, the overshoot phenomenon appears when avoiding appearing great interference, introduce feedback control through P, I simultaneously, realize the steady regulation of rotational speed, avoid smoke exhaust fan's rotational speed to neglect high and suddenly low, the operation is extremely unstable, it is great to have solved plenum chamber pressure short time fluctuation, cause smoke exhaust fan operation extremely unstable, long-time operation can cause the technical problem of motor damage.
Example two
As shown in fig. 6, based on the same inventive concept, the present application provides a control system of a smoke exhaust fan of a continuous annealing furnace, comprising:
an obtaining module 201, configured to obtain a set value SV of plenum pressure and an actual value X of plenum pressure of the continuous annealing furnace;
a comparison module 202 for comparing the set plenum pressure value SV with the actual plenum pressure value X to form a deviation YEn;
the input module 203 is used for inputting the deviation YEn into a PI controller to obtain a rotating speed control quantity Yn;
and the control module 204 is configured to control the rotation speed of the smoke exhaust fan through the rotation speed control amount Yn.
As an alternative embodiment, the input module 203 comprises:
the determining submodule is used for determining a proportional coefficient Kp and an integral time TN of the PI controller according to the actual value X of the plenum pressure, wherein the proportional coefficient Kp and the integral time TN respectively correspond to the actual value X of the plenum pressure;
and the adjusting submodule is used for inputting the deviation YEn into the PI controller, and adjusting the rotating speed control quantity Yn output by the PI controller according to the proportional coefficient Kp and the integral time TN so as to realize stable adjustment of the smoke exhaust fan.
As an alternative embodiment, the determining sub-module is further configured to, when the actual plenum pressure value X is greater than or equal to the upper pressure value limit M, set the proportionality coefficient Kp to 0.75, and set the integration time TN to 5 seconds; when the actual value X of the plenum pressure is smaller than or equal to the lower limit N of the pressure value, the proportionality coefficient Kp is 0.3, and the integration time TN is 13 seconds; when the actual value X of the plenum pressure is larger than the lower limit of the pressure value and smaller than the upper limit of the pressure value, the proportionality coefficient Kp is 0.00045X-0.15, and the integration time TN is-0.008X + 21.
As an optional embodiment, the PI controller is: yn is Y (n-1) + Kp [ (1+ TA/TN) × YEn-YE (n-1) ], wherein Yn is the rotating speed control quantity output by the PI controller in the current sampling period; y (n-1) is the rotating speed control quantity output by the PI controller in a sampling period; kp is a proportionality coefficient; TA is sampling time; TN is the integration time; YEn is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the current sampling period and the actual value X of the pressure of the gas collection chamber; YE (n-1) is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the last sampling period and the actual value X of the pressure of the gas collection chamber.
As an alternative embodiment, the method further comprises: a filtering processing module 205, wherein the filtering processing module 205 is configured to perform filtering processing on the actual value X of the plenum pressure before comparing the set value SV of the plenum pressure with the actual value X of the plenum pressure.
As an alternative embodiment, the: the filtering processing module 205 is further configured to add the actual plenum pressure value X into a first-order filter Xn ═ a × Zn + (1-a) X (n-1) to perform first-order filtering, so as to obtain the filtered actual plenum pressure value X, where: a is a filter coefficient and takes a value between 0.1 and 0.15; zn is the input value of a first-order filter; xn is the filtering output value of the current sampling period of the first-order filter; x (n-1) is the filtered output value of the last sampling period of the first-order filter.
As an alternative embodiment, the input module 203 is further configured to control the input of the PI controller to be equal to the positive limit value LU when the deviation YEn is greater than or equal to the positive limit value LU; when the deviation YEn is less than or equal to a negative limit value LL, controlling the input of a PI controller to be equal to the negative limit value LL; controlling an input of a PI controller to be equal to the deviation YEn when the deviation YEn is less than the positive limit LU and greater than the negative limit LL, wherein the positive limit LU and the negative limit LL are one-third of the plenum pressure set point SV.
As an alternative embodiment, the control module 204 includes:
the first control submodule is used for controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed upper limit value when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is larger than or equal to the preset rotating speed upper limit value;
the second control submodule is used for controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed lower limit value when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than or equal to the preset rotating speed lower limit value;
and the third control sub-module is used for controlling the rotating speed output value of the smoke exhaust fan to be the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than the preset rotating speed upper limit value and larger than the preset rotating speed lower limit value.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the scheme is that YEn deviation between a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber is obtained; processing the input deviation YEn by using a PI controller to obtain a rotating speed control quantity Yn; through rotational speed control volume Yn is right smoke exhaust fan's rotational speed is controlled, because the fluctuation is great in the plenum chamber ressure measurement point short time, and the system operation requirement is steady as far as possible, so adopt the PI controller to carry out speed control, the overshoot phenomenon appears when avoiding appearing great interference, introduce feedback control through P, I simultaneously, realize the steady regulation of rotational speed, avoid smoke exhaust fan's rotational speed to neglect high and suddenly low, the operation is extremely unstable, it is great to have solved plenum chamber pressure short time fluctuation, cause smoke exhaust fan operation extremely unstable, long-time operation can cause the technical problem of motor damage.
EXAMPLE III
A computer storage medium having a computer program stored thereon, the computer program when executed by a processor implementing the steps of:
acquiring a set value SV of the pressure of a gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace; comparing the set value SV of the pressure of the gas collection chamber with the actual value X of the pressure of the gas collection chamber to form a deviation YEn; inputting the deviation YEn into a PI controller to obtain a rotating speed control quantity Yn; and controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn.
In a specific implementation, when the program is executed by a processor, any one of the first embodiment described above may be implemented.
The technical scheme in the embodiment of the application at least has the following technical effects or advantages:
the scheme is that YEn deviation between a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber is obtained; processing the input deviation YEn by using a PI controller to obtain a rotating speed control quantity Yn; through rotational speed control volume Yn is right smoke exhaust fan's rotational speed is controlled, because the fluctuation is great in the plenum chamber ressure measurement point short time, and the system operation requirement is steady as far as possible, so adopt the PI controller to carry out speed control, the overshoot phenomenon appears when avoiding appearing great interference, introduce feedback control through P, I simultaneously, realize the steady regulation of rotational speed, avoid smoke exhaust fan's rotational speed to neglect high and suddenly low, the operation is extremely unstable, it is great to have solved plenum chamber pressure short time fluctuation, cause smoke exhaust fan operation extremely unstable, long-time operation can cause the technical problem of motor damage.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. Therefore, it is intended that the appended claims be interpreted as including preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (9)
1. A control method of a smoke exhaust fan of a continuous annealing furnace is characterized by comprising the following steps:
acquiring a set value SV of the pressure of a gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace;
comparing the set value SV of the pressure of the gas collection chamber with the actual value X of the pressure of the gas collection chamber to form a deviation YEn;
inputting the deviation YEn into a PI controller to obtain a rotation speed control quantity Yn, including: determining a proportional coefficient Kp and an integral time TN of the PI controller according to the actual value X of the plenum chamber pressure; the proportional coefficient Kp and the integral time TN respectively correspond to the actual value X of the pressure of the gas collection chamber, and the PI controller is a controller containing two parameters of proportion P and integral I;
inputting the deviation YEn into the PI controller, and adjusting the rotating speed control quantity Yn output by the PI controller according to the proportional coefficient Kp and the integral time TN;
and controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn.
2. The method for controlling the exhaust fan of the continuous annealing furnace according to claim 1, wherein the determining the proportional coefficient Kp and the integral time TN of the PI controller according to the actual value X of the pressure in the gas collecting chamber comprises:
when the actual value X of the plenum pressure is greater than or equal to the upper limit M of the pressure value, the proportionality coefficient Kp is 0.75, and the integration time TN is 5 seconds;
when the actual value X of the plenum pressure is smaller than or equal to the lower limit N of the pressure value, the proportionality coefficient Kp is 0.3, and the integration time TN is 13 seconds;
when the actual value X of the plenum pressure is larger than the lower limit of the pressure value and smaller than the upper limit of the pressure value, the proportionality coefficient Kp is 0.00045X-0.15, and the integration time TN is-0.008X + 21.
3. The method for controlling the smoke exhaust fan of the continuous annealing furnace according to claim 1, wherein the PI controller is specifically:
yn is Y (n-1) + Kp [ (1+ TA/TN) × YEn-YE (n-1) ], wherein Yn is the rotating speed control quantity output by the PI controller in the current sampling period; y (n-1) is the rotating speed control quantity output by the PI controller in a sampling period; kp is a proportionality coefficient; TA is sampling time; TN is the integration time; YEn is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the current sampling period and the actual value X of the pressure of the gas collection chamber; YE (n-1) is the deviation of the set value SV of the pressure of the gas collection chamber corresponding to the last sampling period and the actual value X of the pressure of the gas collection chamber.
4. The method for controlling the smoke exhaust fan of the continuous annealing furnace according to claim 1, wherein before comparing the set value SV of the plenum pressure with the actual value X of the plenum pressure, the method further comprises:
and carrying out filtering processing on the actual value X of the plenum pressure.
5. The method for controlling the smoke exhaust fan of the continuous annealing furnace according to claim 4, wherein the step of filtering the actual value X of the plenum pressure comprises the following steps:
and (3) connecting the plenum pressure actual value X into a first-order filter Xn ═ a × Zn + (1-a) X (n-1) for first-order filtering to obtain the filtered plenum pressure actual value X, wherein: a is a filter coefficient and takes a value between 0.1 and 0.15; zn is the input value of a first-order filter; xn is the filtering output value of the current sampling period of the first-order filter; x (n-1) is the filtered output value of the last sampling period of the first-order filter.
6. The method for controlling the smoke exhaust fan of the continuous annealing furnace according to claim 1, wherein the inputting the deviation YEn into the PI controller comprises:
when the deviation YEn is greater than or equal to a positive limit value LU, controlling the input of the PI controller to be equal to the positive limit value LU; when the deviation YEn is less than or equal to a negative limit value LL, controlling the input of a PI controller to be equal to the negative limit value LL; controlling an input of a PI controller to be equal to the deviation YEn when the deviation YEn is less than the positive limit LU and greater than the negative limit LL, wherein the positive limit LU and the negative limit LL are one-third of the plenum pressure set point SV.
7. The method for controlling the exhaust fan of the continuous annealing furnace according to any one of claims 1 to 6, wherein the controlling the rotation speed of the exhaust fan by the rotation speed control amount Yn comprises:
when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is greater than or equal to a preset rotating speed upper limit value, controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed upper limit value;
when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than or equal to a preset rotating speed lower limit value, controlling the rotating speed output value of the smoke exhaust fan to be the preset rotating speed lower limit value;
and when the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn is smaller than the preset rotating speed upper limit value and larger than the preset rotating speed lower limit value, controlling the rotating speed output value of the smoke exhaust fan to be the rotating speed output value of the smoke exhaust fan corresponding to the rotating speed control quantity Yn.
8. The utility model provides a control system of continuous annealing stove smoke exhausting fan which characterized in that includes:
the acquisition module is used for acquiring a set value SV of the pressure of the gas collection chamber and an actual value X of the pressure of the gas collection chamber of the continuous annealing furnace;
the comparison module is used for comparing the set value SV of the plenum pressure with the actual value X of the plenum pressure to form a deviation YEn;
the input module is used for inputting the deviation YEn to the PI controller to obtain a rotating speed control quantity Yn, and comprises the following components: the determining submodule is used for determining a proportional coefficient Kp and an integral time TN of the PI controller according to the actual value X of the plenum pressure; the proportional coefficient Kp and the integral time TN respectively correspond to the actual value X of the pressure of the gas collection chamber, and the PI controller is a controller containing two parameters of proportion P and integral I;
the adjusting submodule is used for inputting the deviation YEn into the PI controller and adjusting the rotating speed control quantity Yn output by the PI controller according to the proportional coefficient Kp and the integral time TN;
and the control module is used for controlling the rotating speed of the smoke exhaust fan through the rotating speed control quantity Yn.
9. A computer storage medium on which a computer program is stored, which program, when being executed by a processor, is adapted to carry out the method steps of any of claims 1 to 6.
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