CN105132668B - A kind of method for silicon steel continuous annealing furnace distance piece controling of the pressure of the oven - Google Patents
A kind of method for silicon steel continuous annealing furnace distance piece controling of the pressure of the oven Download PDFInfo
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Abstract
The invention provides a kind of method for silicon steel continuous annealing furnace distance piece controling of the pressure of the oven, PLC control system is delivered to by furnace pressure P01,2# stove area of pressure transmitter measurement 1# stoves area furnace pressure P02 and 1# distance piece furnace gas furnace pressure P12；PLC control system performs pid parameter Fuzzy self- turning program, and calculating obtains pid parameter, and then exports MV by PID controller, and sends association arithmetic and control unit to；PLC control system obtains 1# distance piece diffusion valve correction factors J12 always according to class normal distyribution function simultaneously, 1# distance pieces diffusion valve output aperture MV12=J12 × MV is calculated finally by association arithmetic and control unit, and MV12 result of calculations are assigned to 1# distance pieces diffusion valve to adjust distance piece furnace gas furnace pressure.The present invention reduces the frequency for starting nitrogen defence program to reduce the interference to furnace pressure and atmosphere in the case where ensuring distance piece air-flow buffer action and distance piece slight positive pressure state.
Description
Technical field
The invention belongs to be used for the control method field of stove section atmosphere barrier in silicon steel Technology for Heating Processing, and in particular to a kind of
The control method of furnace pressure in silicon steel continuous annealing furnace distance piece.
Background technology
According to silicon steel Technology for Heating Processing, dry gas atmosphere and wet atmosphere stove section, the nitrogen and hydrogen mixture atmosphere stove section of various proportionings, heating
Section is required for carrying out gas isolating with cooling section, and gas isolating is by adjusting the two stoves section furnace pressure difference intersegmental with intermediate isolating come real
It is existing, it is therefore desirable to be provided for the sealing device of controling of the pressure of the oven.The device for being used for stove section atmosphere barrier on current silicon steel line by
Isolation baffle plate, exhaust stack and regulating valve composition is diffused, but control method is single, mainly by distance piece furnace pressure and diffuse regulating valve
Composition closed loop is adjusted.But there are the following problems for this control method：One, the regulation of single closed loop, it is difficult in any situation
It can ensure that good furnace pressure is poor down, also just be difficult to the good isolation of atmosphere；Secondly, this control method adjust itself
Will necessarily cause stove section furnace pressure fluctuation in periphery while distance piece furnace pressure, and when annealing furnace need to the section atmosphere configuration of multiple stoves every
When being controlled from section, each independent control mode can trigger bigger stove section furnace pressure fluctuation to this distance piece unavoidably, and then influence
The gradient and stability of body of heater furnace pressure.
The content of the invention
The technical problem to be solved in the present invention is, for asking on current silicon steel continuous annealing furnace distance piece controling of the pressure of the oven
Topic there is provided a kind of method for silicon steel continuous annealing furnace distance piece controling of the pressure of the oven, ensure distance piece air-flow buffer action and
In the case of distance piece slight positive pressure state, the frequency for starting nitrogen defence program is reduced to reduce to furnace pressure and atmosphere
Interference.
The present invention is for the technical scheme that is used of solution above-mentioned technical problem：
A kind of method for silicon steel continuous annealing furnace distance piece controling of the pressure of the oven, the distance piece by 1# isolation baffle plates, 2# every
From baffle plate, exhaust stack, diffuse regulating valve and diffuse isolation baffle plate composition, control method comprises the following steps：
S1, furnace pressure P01,2# stove area of pressure transmitter measurement 1# stoves area furnace pressure P02 and 1# distance piece furnace gas furnace pressure P12, and
Each pressure data P01, P02 and P12 are sent to PLC control system；
That value that S2, PLC control system choose minimum from 1# stoves area furnace pressure P01,2# stove area furnace pressure P02 of acquisition is made
For Pmin；Pmin and 1# distance piece furnace gas furnace pressure P12 differences are calculated, Pm is used as；
S3, the sweep time for considering PLC control system and the fluctuation of stove area furnace pressure rate of change, set Pm week time
Phase t, calculates Pm time change Δ Pm=Pm (t+1)-Pm (t), and time rate of change Epm=Δs Pm (t+1)-Δ Pm (t)；
Set manually the target set point Spm of PID controller, and Pm is the show value of PID controller, PLC control system is by Δ Pm
And Epm carries out Fuzzy processing, and pid parameter Fuzzy self- turning program is performed, calculating obtains pid parameter；
S4, the pid parameter for obtaining step S3 calculating substitute into PID controller, and PID controller outputs it value MV after calculating
Send association arithmetic and control unit to；
S5, the difference for calculating 1# distance piece furnace gas furnace pressure P12 and 1# alarm setting values SV1 and distance piece furnace gas furnace pressure maximum
Range P12max accounting Δ P1, i.e.,
1# distance piece diffusion valve normal states COEFFICIENT K 12 and accounting Δ P1 meets the relation of following formula class normal distyribution function：
K12=exp [- π (Δ P1- μ)2] (1)
In formula, μ is desired value, by manually rule of thumb setting, and μ ∈ (0,1), Δ P1 ∈ [0, μ]；
Accounting Δ P1 is substituted into formula (1), 1# distance piece diffusion valve normal states COEFFICIENT K 12 is tried to achieve；
S6, by step S5 similarly, try to achieve 2# distance piece diffusion valve normal states COEFFICIENT K 23, it is specific as follows：
Calculate 2# distance pieces furnace gas furnace pressure P23 and 2# alarm setting values SV2 difference and distance piece furnace gas furnace pressure maximum
Journey P23max accounting Δ P2, i.e.,
2# distance piece diffusion valve normal states COEFFICIENT K 23 and accounting Δ P2 meets the relation of following formula class normal distyribution function：
K23=exp [- π (Δ P2- μ)2] (2)
In formula, μ is desired value, by manually rule of thumb setting, and μ ∈ (0,1), Δ P2 ∈ [0, μ]；
Accounting Δ P2 is substituted into formula (2), 2# distance piece diffusion valve normal states COEFFICIENT K 23 is tried to achieve；
S7, K12, the K23 obtained according to step S5~S6, set 1# distance piece diffusion valve correction factors as J12, according to 1#
Distance piece diffusion valve correction factor J12 sizes are influenceed by 1# distance piece normal states COEFFICIENT K 12 and 2# distance piece normal states COEFFICIENT K 23,
Calculate 1# distance piece diffusion valve correction factors J12=K12 × K23；
The 1# distance piece diffusion valves that S8, the fuzzy controller obtained according to step S4 output MV and step S7 are obtained are repaiied
Positive coefficient J12, calculates 1# distance pieces diffusion valves by associating arithmetic and control unit and exports aperture MV12=J12 × MV, and by MV12
Result of calculation is assigned to 1# distance pieces diffusion valve to adjust distance piece furnace gas furnace pressure.
By such scheme, adjacent both sides distance piece normal state coefficient is considered when calculating other distance piece diffusion valve correction factors
Influence, 2# diffusion valves correction factor are 1# distance piece normal states COEFFICIENT K 12,2# distance piece normal state coefficients with step S5~S7 similarly
The product of K23 and 3# distance piece normal states COEFFICIENT K 34, other diffusion valve correction factors are by that analogy.
Beneficial effects of the present invention：
1st, the response speed and control essence of the poor closed-loop control of distance piece furnace gas furnace pressure are improved using Fuzzy PID Control Technique
Degree, substantially increases staged isolation effect of the distance piece to furnace atmosphere of silicon steel continuous annealing furnace；
2nd, the foundation using class normal distyribution function and to adjacent distance piece correction factor relevance, by distance piece and adjacent
The furnace pressure fluctuation situation of distance piece reduces the frequency for starting nitrogen defence program to be modified to diffusing valve opening, thus
The probability that interference is produced to furnace pressure and atmosphere is reduced, and then improves the production efficiency and quality of silicon steel continuous annealing furnace.
Brief description of the drawings
Fig. 1 is the structural representation of distance piece of the embodiment of the present invention；
Fig. 2 is the control principle drawing of distance piece group of the embodiment of the present invention；
Fig. 3 is the control flow chart of distance piece group of the embodiment of the present invention；
In figure, 1-1# isolation baffle plates, 2-2# isolation baffle plates, 3- exhaust stacks, 4- diffuses regulating valve, and 5- diffuses isolation baffle plate,
6-1# stoves area furnace gas, 7-2# stoves area furnace gas, 8- distance piece furnace gases, 9-1# stoves area pressure port, 10-2# stoves area pressure port, 11- isolation
Section pressure port.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the embodiment is not defined to the scope of the present invention, ability
Various conversion and improvement that field technique personnel make to technical scheme, all should fall into present invention determine that protection domain
It is interior.
As shown in figure 1, by taking 1# distance pieces region as an example, distance piece involved in the present invention is isolated by 1# isolation baffle plates 1,2#
Baffle plate 2, exhaust stack 3, diffuse regulating valve 4 and diffuse isolation baffle plate 5 and constitute, 1# isolation baffle plates 1 and 2# isolation baffle plates 2 are tied from machinery
Barrier Chu1#Lu areas furnace gas 6,8 three kinds of atmosphere of 2# stoves area furnace gas 7 and distance piece furnace gas in terms of structure, to isolate 1# stoves area furnace gas 6
Ji2#Lu areas furnace gas 7, it is to avoid the mutually string, but isolation can not be fully achieved from mechanical aspects in list of Ji2#Lu areas furnace gas 7 of 1# stoves area furnace gas 6
Effect is supplemented, it is necessary to be given in terms of air-flow, therefore distance piece makes distance piece furnace gas 8 under any circumstance using mode is diffused
Furnace pressure is respectively less than furnace pressure Ji2#Lu areas of 1# stoves area furnace pressure, and the gas that such 1# isolation baffle plates 1 and 2# isolation baffle plates 2 leakage comes is equal
Exhaust stack 3 can be flow to from distance piece to diffuse away, to realize the intact isolation of atmosphere.It is to prevent extraneous air etc. from sealing in simultaneously
Danger is produced in stove, distance piece is necessary to ensure that slight positive pressure state；To prevent the furnace pressure of distance piece furnace gas 8 too low, nitrogen is set to protect
Program, is passed through nitrogen by opening nitrogen stop valve to distance piece to ensure the barotropic state of distance piece.
With reference to shown in Fig. 2, pressure transmitter PT-F01, PT-F02 and PT-F12 pass through 1#, 2# stove area and distance piece pressure
Hole is obtained after 1#, 2# stove area and distance piece furnace pressure, is given PLC control system calculation process and is finally calculated and obtains diffusing tune
Valve PCV-F12 output aperture is saved, for controlling to diffuse regulating valve, and then stable 1#, 2# stove area and distance piece furnace pressure.
In order to prevent extraneous air etc. is sealed in from producing danger in stove, distance piece is necessary to ensure that slight positive pressure state, so isolation
Section furnace gas furnace pressure P12 can not be too low, if too low, and PLC system can start nitrogen defence program, opens nitrogen stop valve SOV-
F12 is passed through nitrogen to ensure distance piece furnace gas furnace pressure to distance piece.
But being passed through for nitrogen of protection can cause the confusion of furnace pressure and atmosphere in certain time, normal production can be produced
Life has a strong impact on, so the control method main purpose that the present invention gives is exactly to ensure the situation of distance piece slight positive pressure state
Under, it is to avoid start nitrogen defence program, to maintain normal furnace pressure and furnace atmosphere.
As shown in FIG. 1 to 3, it is of the present invention continuously to be moved back for silicon steel by taking 1# distance piece furnace gas controling of the pressure of the oven as an example
The method of stove distance piece controling of the pressure of the oven, comprises the following steps：
S1, pressure transmitter are measured at 1# stoves area pressure port 9,2# stoves area pressure port 10, distance piece pressure port 11 respectively
Furnace pressure P01,2# stove area of 1# stoves area furnace pressure P02 and 1# distance piece furnace gas furnace pressure P12, and each pressure data P01, P02 and P12 are passed
Deliver to PLC control system；PLC control system is obtained after pressure data, will perform two-way flow：One is 1# distance pieces itself
Fuzzy-adaptation PID control computing flow, the second is 1# distance pieces diffuse the solution procedure of valve opening correction factor, last two-way flow is converged
Get together, calculate 1# distance pieces and diffuse valve opening and give and control.Next it is introduced by two-way flow：
Flow one：The fuzzy-adaptation PID control computing flow of 1# distance pieces itself, this flow by this section fuzzy controller
Complete；
That value that S2, PLC control system choose minimum from 1# stoves area furnace pressure P01,2# stove area furnace pressure P02 of acquisition is made
For Pmin, and Pmin and 1# distance piece furnace gas furnace pressure P12 differences are calculated, be used as Pm；
S3, the sweep time for considering PLC control system and stove area furnace pressure fluctuation rate of change, setting Pm when
Between cycle t (generally may be set to 0.2s), calculate Pm time change Δ Pm=Pm (t+1)-Pm (t), and time rate of change
Epm=Δs Pm (t+1)-Δ Pm (t)；The target set point Spm of PID controller is set manually, and Pm is the aobvious of PID controller
Δ Pm and Epm are carried out Fuzzy processing by indicating value, PLC control system, and perform pid parameter Fuzzy self- turning program, are calculated
To pid parameter.
Pid parameter Fuzzy self- turning is to find out tri- parameter logistic coefficient ks of PIDp, integral action coefficient ki, integral action system
Number kdFuzzy relation between Pm time change Δ Pm and time rate of change Epm, in operation by constantly detecting Δ Pm
And Epm, fuzzy reasoning is carried out using fuzzy rule, inquiry fuzzy matrix table to carry out online modification to three parameters, to meet
The difference of control parameter is required during different Δ Pm and Epm, and controlled device is had good dynamic and static performance.
So pid parameter must account in the not effect of three parameters and relation each other in the same time.Define Δ
Pm and Epm and output language variable q (i.e. kp、kiAnd kd) fuzzy subset be { NB, NM, NS, ZO, PS, PM, PB }, subset
Element represent respectively it is negative big, in bearing, bear it is small, zero, just small, center is honest.
As shown in table 1~3, according to artificial technological know-how and practical operation experience, suitable fuzzy reasoning table is set up, is obtained
To for kp、kiAnd kdThe fuzzy control table of three parameters.
The k of table 1pFuzzy reasoning table
The k of table 2iFuzzy reasoning table
The k of table 3dFuzzy reasoning table
Above-mentioned fuzzy reasoning table be comprising 49 fuzzy rules, between each fuzzy sentence or relation, by first
Control rule can calculate controlled quentity controlled variable q determined by sentence1.Similarly, controlled quentity controlled variable can be obtained respectively by remaining each bar sentence
q2..., q49, the fuzzy set q of controlled quentity controlled variable is generated, is represented by：Q=q1+q2+…+q49。
According to the thinking of above formula, so that it may which controlled quentity controlled variable is changed into precise volume from fuzzy quantity.In order to obtain accurate controlled quentity controlled variable, adopt
With the method for weighted average deblurring, in domain each element (i=1,2 ..., n), using it as treating judgement output mould
The degree of membership μ (i) of set weight coefficient is pasted, that is, takes product xiμ (i), then calculate the sum of productsFor degree of membership
The average value x of sumn, i.e.,Average value xnIt is that weighted mean method is the court verdict that fuzzy set is tried to achieve, from
And obtain corresponding Δ kp、ΔkiWith Δ kd, then substitute into formula kp=k 'p+Δkp, ki=k 'i+Δki, kp=k 'p+Δkp(k′p、
k′i、k′dIt is the pid parameter of last moment) calculate.
S4, the pid parameter for obtaining step S3 calculating substitute into PID controller, by pid parameter after PID controller calculating
Output valve MV sends association arithmetic and control unit to.
Flow two：The solution procedure of 1# distance piece diffusion valve correction factors, this process is completed by association arithmetic and control unit.
In order to avoid starting nitrogen defence program because distance piece furnace gas furnace pressure is too low, and then destroy furnace pressure and atmosphere
Distribution is, it is necessary to which while diffusion valve carries out fuzzy PID regulation, situation is fluctuated to diffusing valve opening according to distance piece furnace gas furnace pressure
It is modified.
Silicon steel continuous annealing furnace usually possesses the distance piece of 3 sections and the above, to isolate a variety of stove section atmosphere, and adjacent
Isolation is intersegmental to share same stove area, causes the furnace pressure adjustment effect of adjacent distance piece to influence each other, if their regulation is different
Step, will produce serious negative effect, influence the integrally-regulated of annealing furnace, so distance piece furnace gas controling of the pressure of the oven removes each isolation
It is outer that Duan Zishen completes control, in addition it is also necessary to realizes the intersegmental cooperation of adjacent isolation.
As shown in Fig. 2 by taking 1# distance pieces as an example, 1# distance pieces periphery is adjacent with 2# distance pieces, so the stove of 2# distance pieces
Pressure regulation must affect the regulation of 1# distance pieces, so entering using distance piece furnace gas furnace pressure fluctuation situation to diffusing valve opening
When row amendment, in addition to itself furnace pressure fluctuation of 1# distance pieces is considered, it is also contemplated that 2# distance piece furnace gases furnace pressure is fluctuated.
S5, the difference for calculating 1# distance piece furnace gas furnace pressure P12 and 1# alarm setting values SV1 and distance piece furnace gas furnace pressure maximum
Range P12max accounting Δ P1, i.e.,
Passing through practice summary for distance piece diffusion valve correction factor, in the present embodiment, there is provided a species normal distribution letter
Number：
F (x)=exp [- π (x- μ)2] (1)
By manually rule of thumb setting in desired value μ, and μ ∈ (0,1), x ∈ [0, μ], the x that Δ P1 is substituted into function (1),
The f (x) tried to achieve is 1# distance piece diffusion valve normal states COEFFICIENT K 12.
S6, by step S5 similarly, calculate 2# distance pieces furnace gas furnace pressure P23 and 2# alarm setting values SV2 difference with isolating
Section furnace gas furnace pressure maximum range P23max accounting Δ P2, i.e.,
Δ P2 is substituted into the x in function (1), the f (x) tried to achieve is 2# distance piece diffusion valve normal states COEFFICIENT K 23.
S7, K12, the K23 obtained according to step S5~S6, set 1# distance piece diffusion valve correction factors as J12, according to 1#
Distance piece diffusion valve correction factor J12 sizes are influenceed by 1# distance piece normal states COEFFICIENT K 12 and 2# distance piece normal states COEFFICIENT K 23,
Calculate 1# distance piece diffusion valve correction factors J12=K12 × K23.
The 1# distance piece diffusion valves that S8, the fuzzy controller obtained according to step S4 output MV and step S7 are obtained are repaiied
Positive coefficient J12, calculates 1# distance pieces diffusion valves by associating arithmetic and control unit and exports aperture MV12=J12 × MV, and by MV12
Result of calculation is assigned to 1# distance pieces diffusion valve to adjust distance piece furnace gas furnace pressure.
As shown in Figure 2 and Figure 3, above-mentioned flow is introduced by taking the 1# distance piece furnace gas controling of the pressure of the oven as an example, for other isolation
Section, its control method is the same.But it is right because 1# distance pieces are faced on a 2# distance pieces left side for 2# distance piece furnace gas controling of the pressure of the oven
Face 3# distance pieces, its controling of the pressure of the oven is influenceed by 1# and 3#, so its diffusion valve correction factor should be 1#, 2# and 3# distance piece normal state
The product of coefficient.
Claims (2)
1. a kind of method for silicon steel continuous annealing furnace distance piece controling of the pressure of the oven, it is characterised in that：The distance piece is isolated by 1#
Baffle plate, 2# isolation baffle plates, exhaust stack, diffuse regulating valve and diffuse isolation baffle plate composition, control method comprises the following steps：
S1, furnace pressure P01,2# stove area of pressure transmitter measurement 1# stoves area furnace pressure P02 and 1# distance piece furnace gas furnace pressure P12, and will be each
Pressure data P01, P02 and P12 are sent to PLC control system；
S2, PLC control system choose that value conduct of minimum from 1# stoves area furnace pressure P01,2# stove area furnace pressure P02 of acquisition
Pmin；Pmin and 1# distance piece furnace gas furnace pressure P12 differences are calculated, Pm is used as；
S3, the sweep time for considering PLC control system and the fluctuation of stove area furnace pressure rate of change, set Pm time cycle t,
Calculate Pm time change Δ Pm=Pm (t+1)-Pm (t), and time rate of change Epm=Δs Pm (t+1)-Δ Pm (t)；By people
Work sets the target set point Spm of PID controller, and Pm is the show value of PID controller, and PLC control system is by Δ Pm and Epm
Fuzzy processing is carried out, and performs pid parameter Fuzzy self- turning program, calculating obtains pid parameter；
S4, the pid parameter for obtaining step S3 calculating substitute into PID controller, and PID controller outputs it value MV transmission after calculating
Give association arithmetic and control unit；
S5, the difference and distance piece furnace gas furnace pressure maximum range for calculating 1# distance piece furnace gas furnace pressure P12 and 1# alarm setting values SV1
P12max accounting Δ P1, i.e.,
1# distance piece diffusion valve normal states COEFFICIENT K 12 and accounting Δ P1 meets the relation of following formula class normal distyribution function：
K12=exp [- π (Δ P1- μ)2] (1)
In formula, μ is desired value, by manually rule of thumb setting, and μ ∈ (0,1), Δ P1 ∈ [0, μ]；
Accounting Δ P1 is substituted into formula (1), 1# distance piece diffusion valve normal states COEFFICIENT K 12 is tried to achieve；
S6, by step S5 similarly, try to achieve 2# distance piece diffusion valve normal states COEFFICIENT K 23, it is specific as follows：
Calculate 2# distance pieces furnace gas furnace pressure P23 and 2# alarm setting values SV2 difference and distance piece furnace gas furnace pressure maximum range
P23max accounting Δ P2, i.e.,
2# distance piece diffusion valve normal states COEFFICIENT K 23 and accounting Δ P2 meets the relation of following formula class normal distyribution function：
K23=exp [- π (Δ P2- μ)2] (2)
In formula, μ is desired value, by manually rule of thumb setting, and μ ∈ (0,1), Δ P2 ∈ [0, μ]；
Accounting Δ P2 is substituted into formula (2), 2# distance piece diffusion valve normal states COEFFICIENT K 23 is tried to achieve；
S7, K12, the K23 obtained according to step S5~S6, set 1# distance piece diffusion valve correction factors as J12, are isolated according to 1#
Section diffusion valve correction factor J12 sizes are influenceed by 1# distance piece normal states COEFFICIENT K 12 and 2# distance piece normal states COEFFICIENT K 23, calculate
1# distance piece diffusion valve correction factors J12=K12 × K23；
The 1# distance piece diffusion valve amendments system that S8, the fuzzy controller obtained according to step S4 output MV and step S7 are obtained
Number J12, calculates 1# distance pieces diffusion valve output aperture MV12=J12 × MV, and MV12 is calculated by associating arithmetic and control unit
As a result 1# distance pieces diffusion valve is assigned to adjust distance piece furnace gas furnace pressure.
2. the method according to claim 1 for silicon steel continuous annealing furnace distance piece furnace gas controling of the pressure of the oven, its feature exists
In：The influence of adjacent both sides distance piece normal state coefficient is considered when calculating 2# distance piece diffusion valve correction factors, with step S5~S7
Similarly, 2# distance pieces diffusion valve correction factor is 1# distance piece normal states COEFFICIENT K 12,2# distance piece normal states COEFFICIENT K 23 and 3# isolation
The product of section normal state COEFFICIENT K 34.
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| CN109750250A (en) * | 2019-01-15 | 2019-05-14 | 重庆望变电气（集团）股份有限公司 | A kind of nitriding furnace isolating device and isolation control system |
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| CN200967830Y (en) * | 2006-10-31 | 2007-10-31 | 黄石山力科技发展有限公司 | Protective atmosphere isolation apparatus for cold rolling strip steel continuous annealing furnace |
| CN200992564Y (en) * | 2006-12-28 | 2007-12-19 | 中冶南方(武汉)威仕工业炉有限公司 | Continuous anhealing furnace atmosphere double-baffle isolating device |
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