CN105593381B - Control device and control method for converter furnace blowing equipment - Google Patents
Control device and control method for converter furnace blowing equipment Download PDFInfo
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- CN105593381B CN105593381B CN201480053751.8A CN201480053751A CN105593381B CN 105593381 B CN105593381 B CN 105593381B CN 201480053751 A CN201480053751 A CN 201480053751A CN 105593381 B CN105593381 B CN 105593381B
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- blowing
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4673—Measuring and sampling devices
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/38—Removal of waste gases or dust
- C21C5/40—Offtakes or separating apparatus for converter waste gases or dust
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/25—Process efficiency
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- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Environmental & Geological Engineering (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Feedback Control In General (AREA)
Abstract
This control device (30) for converter furnace blowing equipment uses the exhaust gas flow volume and the component concentration to set parameters in a decarburizing oxygen efficiency equation model. Furthermore, this control device (30) for converter furnace blowing equipment adds the stirring gas flow volume as a variable in the decarburizing oxygen efficiency model equation, thereby reflecting in the decarburizing oxygen efficiency model equation the influence of the stirring gas flow volume during the blowing process. Thus, the decarburizing oxygen efficiency is calculated precisely, thereby enabling the carbon concentration in molten steel at the completion of the blowing process to be controlled precisely to achieve a target carbon concentration.
Description
Technical field
The present invention relates in order that concentration of carbon becomes target concentration of carbon and controls blowing in the molten steel at the end of blowing is processed
Process the control device and controlling party of the bessemerizing equipment that send oxygen amount of the furnace charge (charge) after the sampling moment of midway
Method.
Background technology
Bessemerize in equipment what iron-smelter was used, due to being carried out by being blown into the blowing process of oxygen to molten steel
The removing and intensification of the impurity in molten steel, the composition and temperature of the molten steel at the end of processing blowing are controlled, so that its
It is convergent in the scope specified.However, when blowing is processed, the oxidation reaction in molten steel becomes violent, and molten steel temperature is uprised, institute
To be difficult at every moment measure the composition and temperature of molten steel.
Therefore, in actual job, the composition analysis result of the molten steel for processing midway according to the blowing for sampling is inferred
Concentration of carbon in the molten steel at sampling moment, according to concentration of carbon in the molten steel being inferred to and decarburization oxygen efficiency model formation, and calculates
In order that the composition and temperature of molten steel are collected in specified scope and required after the sampling moment send oxygen amount (below,
Oxygen amount is sent needed for being expressed as).Additionally, above-mentioned decarburization oxygen efficiency model formation is to calculate decarburization oxygen efficiency according to concentration of carbon in molten steel
Formula.Decarburization oxygen efficiency refers to the carbon amounts that the per unit oxygen amount for being blown in converter is discharged to outside converter.One highest wisdom molten steel
The high then decarburization oxygen efficiency of middle concentration of carbon is uprised.
However, there is setup parameter in above-mentioned decarburization oxygen efficiency model formation, set according to operating condition change in operation
Determine the value of parameter, and the decarburization oxygen efficiency model formation after changing according to the value of setup parameter to calculate decarburization oxygen efficiency.However,
The relation of concentration of carbon and decarburization oxygen efficiency is not only according to operating condition also root in molten steel represented by decarburization oxygen efficiency model formation
According to comprising time change, the various key factors of seasonal variations and intricately change.Therefore, it is difficult to suitably change
The setup parameter of decarburization oxygen efficiency model formation and accurately calculate decarburization oxygen efficiency.
According to such background, proposition has the side for suitably setting the setup parameter of decarburization oxygen efficiency model formation
Method.Specifically, it is passing there are as below methods described in patent document 1, that is, select operating condition close with furnace charge next time
Furnace charge, so as to process concentration of carbon and decarburization oxygen efficiency model formation in the molten steel of midway according to the blowing of the passing furnace charge selected
The concentration of carbon mode minimum with the aggregate value of the error of actual value in molten steel, determines decarburization oxygen at the end of the blowing process for calculating
The method of the setup parameter of efficiency Model formula.In addition, patent document 2 records with the regression equation of operating condition to be determined as
The method that the maximum decarburization oxygen efficiency of the setup parameter of decarburization oxygen efficiency model formation and decarburization oxygen efficiency reduce coefficient, and disclose
The utilization of exhaust measurement information determines it is effective for the coefficient of regression equation.
Patent document 1：Japanese Unexamined Patent Publication 2010-7150 publications
Patent document 2：Japanese Unexamined Patent Publication 2012-117090 publications
However, the method that patent document 1 is recorded is only using operating condition and the constituent analysis value of the molten steel for sampling
Determine the setup parameter of decarburization oxygen efficiency model formation.It is thus impossible to consider that various external disturbances, non-measurement information become reason
And the blowing for producing processes the passage change of reaction, there is the limit in the raising of precision.Additionally, as above-mentioned external disturbance, not
Measurement information, composition, yield rate, measurement error of the auxiliary material for indicating input molten steel that can illustrate etc..In addition, as enforcement
Hold the index that blowing processes the passage change of reaction, although have extraction flow, constituent analysis value, but in patent document 1
The utilization of these information is not referred to.
On the other hand, in the method that patent document 2 is recorded, by the way that make will be according in the exhaust stove that calculates of measurement information
Savings oxygen amount is contained in the explanatory variable of 1 regression equation and processes the passage change of reaction to consider to blow.However, it is difficult to 1 time
The setup parameter of the regression equation decarburization oxygen efficiency model formation that accurately expression non-linear formula is represented.Therefore, according to special
The method that sharp document 2 is recorded, the possibility that the computational accuracy for having the decarburization oxygen efficiency of decarburization oxygen efficiency model formation is reduced.
Further, it is contemplated that there is also can accurately express setup parameter if being processed to exhaust measurement information
Situation, but there is no the concrete record related to the processing method of exhaust measurement information in patent document 2.In addition, in order to carry out back
Return calculating, need in advance for the optimal maximum decarburization oxygen efficiency of passing furnace charge calculating and decarburization oxygen efficiency reduction coefficient, but
Patent document 2 is without the concrete record related to the computational methods.
Also, the value of the setup parameter of decarburization oxygen efficiency model formation is not necessarily limited to be processed in the blowing of 1 furnace charge part
During do not change.According to the data analysis of inventor, following opinion is obtained：If the stirring gas being particularly blown in converter
Flow changes in furnace charge, then the setup parameter of decarburization oxygen efficiency model formation is affected by the flow of stirring gas and changes
It is.However, the setting ginseng that the method that patent document 1 and patent document 2 are recorded is not considered in the blowing processing procedure of 1 furnace charge part
The change of several values.Therefore, the method recorded according to patent document 1,2, there is the decarburization oxygen based on decarburization oxygen efficiency model formation
The possibility that the computational accuracy of efficiency is reduced.
The content of the invention
The present invention is produced for above-mentioned such problem, be its object is to by accurately calculating decarburization oxygen effect
Rate is controlled to the control for bessemerizing equipment of target concentration of carbon come concentration of carbon in the molten steel at the end of accurately blowing is processed
Device processed and control method.
In order to solve above-mentioned problem, purpose is realized, the control device for bessemerizing equipment of the present invention is in blowing process
The oxygen amount of sending of the furnace charge after the sampling moment of way is controlled, so that concentration of carbon becomes mesh in the molten steel at the end of blowing is processed
Mark concentration of carbon, the above-mentioned control device for bessemerizing equipment is characterised by possessing：Model formation calculating part, it is using at least
Concentration of carbon in molten steel and stirring gas flow are set to into input variable and decarburization oxygen efficiency is set to into output variable and with one
The model formation of the setup parameter more than individual is calculating decarburization oxygen efficiency；Model parameter correction portion, it is directed to blowing process and terminates
Multiple passing furnace charge afterwards, concentration of carbon, row in the molten steel at the end of processing midway sampling moment and blowing process using blowing
The flow of gas and the constituent concentration of exhaust, to be modified at least one of above-mentioned setup parameter；Passing process flexible strategy
Calculating part, it is based on the operating condition of the multiple passing furnace charge after blowing process terminates with the work for blowing the furnace charge in processing procedure
The difference of industry condition and blowing process the model that the furnace charge of midway processes the passing furnace charge at midway sampling moment relative to blowing
The similar degree of formula is calculating the flexible strategy of each passing furnace charge；Model parameter generating unit in converting process, it is used by above-mentioned mould
The setup parameter of the revised each passing furnace charge of shape parameter correction portion and calculated by the above-mentioned passing flexible strategy calculating part that processes
The flexible strategy of each passing furnace charge come calculate blowing processing procedure in furnace charge setup parameter；And oxygen amount calculating part is sent, it is used
Decarburization oxygen efficiency processes the oxygen amount of sending of the furnace charge for sampling the blowing process midway after the moment halfway to calculate to blow, above-mentioned de-
Carbon oxygen efficiency using processing in the midway sampling molten steel that measures of moment concentration of carbon, target concentration of carbon and passing through in blowing on
State model parameter generating unit is calculated in converting process setup parameter and calculated by above-mentioned model formation calculating part.
The present invention's bessemerizes the control device of equipment according to foregoing invention, is characterised by, above-mentioned model parameter amendment
Setup parameter is corrected in portion, so that concentration of carbon is with to make above-mentioned model public in blowing processes the midway sampling molten steel that measures of moment
The blowing that formula is set up processes carbon in the molten steel that the difference of concentration of carbon, blowing are measured at the end of processing in the molten steel at sampling moment halfway
The difference and each setup parameter and mark of concentration of carbon in concentration and the molten steel at the end of processing the blowing that above-mentioned model formation is set up
The weighted sum of squares of the difference of quasi- value is minimized.
The present invention's bessemerizes the control device of equipment according to foregoing invention, is characterised by, above-mentioned passing process flexible strategy
Calculating part above-mentioned operating condition include blowing process the midway sampling moment and at the end of blowing is processed it is tight before per unit
The stirring gas flow of molten steel weight.
In order to solve above-mentioned problem, purpose is realized, the control method for bessemerizing equipment of the present invention is in blowing process
The oxygen amount of sending of the furnace charge after the sampling moment of way is controlled, so that concentration of carbon becomes mesh in the molten steel at the end of blowing is processed
Mark concentration of carbon, it is above-mentioned bessemerize the control method of equipment characterized in that, including：Amendment step, in above-mentioned amendment step
In, the multiple passing furnace charge after terminating for blowing process processes the midway sampling moment and blowing process terminates using blowing
When molten steel in concentration of carbon, exhaust flow and exhaust constituent concentration, at least by concentration of carbon in molten steel and stirring
Gas flow be set to input variable and be set to decarburization oxygen efficiency in the setup parameter of the model formation of output variable at least one
It is individual to be modified；Flexible strategy calculation procedure, the multiple passing furnace charge in above-mentioned flexible strategy calculation procedure, after being terminated based on blowing process
Operating condition with blowing processing procedure in furnace charge operating condition difference and blowing process midway furnace charge relative to
Blowing processes the similar degree of the model formation of the passing furnace charge at midway sampling moment to calculate the flexible strategy of each passing furnace charge；Parameter
Calculation procedure, in above-mentioned parameter calculation procedure, using the setting ginseng of revised each passing furnace charge in above-mentioned amendment step
Number and the flexible strategy of each passing furnace charge that calculate in above-mentioned flexible strategy calculation procedure are calculating the setting of the furnace charge during blowing is processed
Parameter；And the blowing calculated using decarburization oxygen efficiency after the blowing process midway sampling moment processes sending for the furnace charge of midway
The step of oxygen amount, above-mentioned decarburization oxygen efficiency is using concentration of carbon, target in processing the molten steel that halfway the sampling moment measures in blowing
Concentration of carbon and the setup parameter calculated in above-mentioned parameter calculation procedure are simultaneously calculated by above-mentioned model formation.
The control device and control method for bessemerizing equipment of the invention, can be by accurately calculating de-
Carbon oxygen efficiency is controlled to target concentration of carbon come concentration of carbon in the molten steel at the end of accurately blowing is processed.
Description of the drawings
Fig. 1 is to represent the control device for bessemerizing equipment and the control applied as one embodiment of the present invention
The schematic diagram of the structure for bessemerizing equipment and its control system of method.
Fig. 2 is the block diagram of the structure for representing the control device shown in Fig. 1.
Fig. 3 is the figure of the function example of the impact coefficient for representing stirring gas.
Fig. 4 is the figure for representing the relation of concentration of carbon and decarburization oxygen efficiency in molten steel.
Fig. 5 is the flow chart of the flow process of the model parameter correcting process for being denoted as one embodiment of the present invention.
Fig. 6 is that the oxygen amount of sending for being denoted as one embodiment of the present invention calculates the flow chart of the flow process for processing.
Fig. 7 is the figure for representing unit stirring gas flow and the relation example for adding up to send oxygen amount.
The explanation of reference：
10 ... control terminals；20 ... database servers (DB servers)；20a ... work datas storehouse (operation DB)；20b…
Main information database (main information DB)；20c ... parameter databases (parameter DB)；30 ... control devices；31 ... input and output portions；
32 ... first processing units；32a ... model parameter correction portions；33 ... second processing portions；The passing process flexible strategy calculating parts of 33a ...；
Model parameter generating unit in 33b ... converting processes；33c ... send oxygen amount calculating part；34 ... model formation calculating parts；40 ... input dresses
Put；50 ... display devices；100 ... converters；101 ... molten steel；102 ... spray guns；103 ... slags；104 ... pipes；105 ... exhaust detections
Portion 106 ... exhaust flow-meter；107 ... passages；108 ... flowmeters.
Specific embodiment
Hereinafter, referring to the drawings, to the control device for bessemerizing equipment as one embodiment of the present invention and control
Method processed is illustrated.
(bessemerizing the structure of equipment)
First, with reference to Fig. 1, correspondence be used as the control device for bessemerizing equipment of one embodiment of the present invention and
The structure for bessemerizing equipment of control method is illustrated.
Fig. 1 is to represent the control device for bessemerizing equipment and the control applied as one embodiment of the present invention
The schematic diagram of the structure for bessemerizing equipment and its control system of method.As shown in figure 1, applying as the present invention one
The control device for bessemerizing equipment of embodiment and bessemerizing in equipment for control method, the steel in converter 100
Spray gun 102 is configured with liquid 101, high pressure oxygen is sprayed from the leading section of spray gun 102 to molten steel 101.Impurity in molten steel 101 into
Divide the high pressure oxygen sprayed from spray gun 102 oxidation and be incorporated in slag 103 (blowing process).
The top of converter 100 is provided with the pipe 104 that cigarette is led in exhaust, being internally provided with for detecting companion in pipe 104
Various composition (such as CO, the CO for the exhaust for processing with blowing and discharging2、O2、N2, H2O, Ar etc.) concentration exhaust test section
105 and for measure exhaust flow exhaust flow-meter 106.The differential pressure of Venturi tube, the upstream and downstream of throttle orifice is counted
Survey, and the flow of exhaust is obtained by calculating based on measured value.Be vented as gas, volume according to temperature, pressure and change, because
This calculated value is scaled the gas flow of standard state (such as temperature is 0 DEG C, pressure is 1 atmospheric pressure).
Molten steel 101 in converter 100, is blown into as indifferent gas via the passage 107 formed in the bottom of converter 100
The argon gas of body, stirs molten steel 101 to promote the reaction of high pressure oxygen and molten steel 101 by argon gas.Measured using flowmeter 108
It is blown into the flow (stirring gas flow) of the argon gas of molten steel 101.Blowing process midway measure a molten steel 101 temperature,
Composition, and determined based on the information for measuring high pressure oxygen quantity delivered (sending oxygen amount) and feed speed (sending oxygen speed),
Stirring gas flow etc..In addition, blowing process start it is tight before terminate with blowing process after carry out molten steel 101 temperature and into
The analysis for dividing.Usually, the operational ton that blowing is processed sets once before blowing process starts, and blowing is obtained midway is processed
It is modified after the temperature of molten steel and the measured value of composition.The present invention is to send the determination of oxygen amount related to the latter.
(structure of control system)
Next, with reference to Fig. 1, to applying the control device for bessemerizing equipment as one embodiment of the present invention
And the structure of the control system for bessemerizing equipment of control method is illustrated.
As shown in figure 1, applying the control device for bessemerizing equipment as one embodiment of the present invention and control
The control system for bessemerizing equipment of method processed possesses as main composition key element：Control terminal 10；Database server (DB
Server) 20；Control device 30；Input unit 40；And display device 50.
Control terminal 10 is made up of information processors such as personal computer, work stations.Control terminal 10 is in order that molten steel
101 constituent concentration controls send oxygen amount, send the height of oxygen speed, stirring gas flow, spray gun 102 in desired scope
And auxiliary material input amount, and collect send oxygen amount, send oxygen speed, stirring gas flow, spray gun height and auxiliary material input
The data of the actual achievement value of amount are used as operational ton actual achievement.
DB servers 20 possess：Work data storehouse (operation DB) 20a；Main information database (main information DB) 20b；And ginseng
Number database (parameter DB) 20c.
Operation DB20a is stored beyond the related time series of the passing furnace charge after terminating to blowing process and time series
And to the operation actual performance information beyond the related time series of furnace charge and time series that perform in blowing processing procedure.
Seasonal effect in time series operation actual performance information includes that the data related to operational ton actual achievement (send oxygen amount, send oxygen speed, stirring gas stream
The time serial message of amount, spray gun height and auxiliary material input amount)；The data related to operational ton plan are (predetermined to send oxygen
Measure, make a reservation for send the time series of oxygen speed, predetermined stirring gas flow, predetermined spray gun height and predetermined auxiliary material input amount
Information)；And the data (constituent concentration of exhaust and the time serial message of flow) related to exhaust actual achievement.Time series
Operation actual performance information in addition includes specification information (iron liquid information (steel grade), manufacture specification (target concentration of carbon, target temperature))；
The data (predetermined always send oxygen amount, predetermined auxiliary material total input amount, predetermined stirring gas total amount) related to the plan of operational ton；With
And with the actual achievement value of always sending oxygen amount and blowing before processing after and blowing processing procedure in molten steel constituent concentration and temperature
Related data.
Main information DB20b, stores and processes required to perform model parameter correcting process described later and sending oxygen amount to calculate
The data such as physical constant, threshold value, setup parameter.
Parameter DB20c is stored in the decarburization oxygen after being modified to each passing furnace charge in model parameter correcting process described later
The setup parameter of efficiency Model formula.
Control device 30 is by the operational ton actual achievement collected by control terminal 10 and by exhaust test section 105 and exhaust stream
The constituent concentration and flow (exhaust actual achievement) of the exhaust that gauge 106 is measured as furnace charge information in converting process, based on blowing
Furnace charge information send oxygen amount needed for calculating during refining, and result of calculation is exported to control terminal 10, display device 50.Control dress
Put 30 detailed construction it is aftermentioned.
Input unit 40 is made up of input units such as keyboard, mouse pointers, related to process described later various being input into
Operated during information.Display device 50 is made up of display devices such as CRT, liquid crystal displays, the various places of display control unit 30
Reason result.
(structure of control device)
Next, illustrating to the structure of control device 30 with reference to Fig. 2.
Fig. 2 is the block diagram of the structure of the control device 30 for being denoted as one embodiment of the present invention.As shown in Fig. 2 making
Control device 30 for one embodiment of the present invention possesses：Input and output portion 31；First processing unit 32；Second processing portion 33；
And model formation calculating part 34.Input and output portion 31 is to the transmission of the information between control device 30 and external device (ED) and connects
Receipts are controlled.First processing unit 32, second processing portion 33 and model formation calculating part 34 are by the fortune in control device 30
Calculate processing meanss to perform computer program to carry out.First processing unit 32 possesses model parameter correction portion 32a.Second processing portion 33
Possess in passing process flexible strategy calculating part 33a, converting process model parameter generating unit 33b and send oxygen amount calculating part 33c.On
The function of stating each several part is aftermentioned.
Control device 30 with this spline structure is by execution model parameter correcting process shown below and send oxygen amount
Calculating is processed, and accurately calculates decarburization oxygen efficiency, and concentration of carbon is controlled in the molten steel at the end of accurately blowing is processed
Target concentration of carbon.Hereinafter, to performing model parameter correcting process and sending oxygen amount to calculate the action of the control device 30 when processing
Illustrate.
(model parameter correcting process)
First, with reference to Fig. 3 to Fig. 5, the flow process of the model parameter correcting process as one embodiment of the present invention is entered
Row explanation.
In the control device 30 as one embodiment of the present invention, if model parameter correction portion 32a is defeated via being input into
Go out the operation actual performance information that portion 31 obtains the furnace charge after blowing process terminates, then so that the decarburization oxygen efficiency mould used during operation
The setup parameter of the type formula mode consistent with operation actual performance information is modified.
In the present embodiment, decarburization oxygen efficiency model formation is described by non-thread shape function or segmentation line shape function,
Formula (1) for example as shown below, (2) represent like that.Formula (1) shown below is for calculating relative to sending oxygen amount list
Position consumption (Nm3/ton：It is to send oxygen amount [Nm3] divided by process object molten steel weight [ton] obtained by) molten steel in concentration of carbon
The formula of decrement (%).In formula (1), parameter C is concentration of carbon in molten steel, and k, q, p are setup parameters.In addition, parameter alpha is
The impact coefficient of stirring gas (argon gas), is by stirring gas flux unit consumption as shown in following formula (2)
(Nm3/Hr/ton：Stirring gas flow is divided by obtained by the molten steel weight for dealing with objects) VbIt is determined that value.Stirring gas affects system
The value of number α can be provided with form, it is also possible to be provided by continuous function.Represent that stirring gas affects the function of factor alpha in Fig. 3
Example.In this case, setup parameter of model parameter correction portion 32a from main information DB20b function reading.
[formula 1]
[formula 2]
α=f (Vb)…(2)
The chart of the formula (1) in the case where Fig. 4 represents that stirring gas impact factor alpha is constant.As shown in figure 4, de-
Carbon oxygen efficiency dC/dO2Rise as the value of concentration of carbon C in molten steel increases.However, decarburization oxygen efficiency dC/dO2Less than setting
Parameter k.Its reason is because in the state of concentration of carbon C is abundant in molten steel that the amount of oxygen being blown into becomes the restriction of decarburized amount.Separately
Outward, if concentration of carbon C is 0 to mean that concentration of carbon C joins less than setting in molten steel less than decarburization oxygen efficiency if setup parameter q in the molten steel
Then decarburizing reaction itself value of number more than q does not occur.If in addition, changing setup parameter p, as shown in Figure 4 decarburization is anti-
Answer velocity variations.
Among the decarburization oxygen efficiency model formation shown in formula (1), because being multiplied by stirring gas shadow on setup parameter p
Factor alpha is rung, so decarburizing reaction speed increases if stirring gas affects the value of factor alpha to diminish.In the present invention, by stirring
Mix gases affect factor alpha to import among decarburization oxygen efficiency model formation and seek the raising of model accuracy.Setup parameter is as more than
As shown in have k, p, q3, which setup parameter is modified for each furnace charge, can be according to the converter as object
The characteristic of blowing equipment is determining.In the present embodiment the value of setup parameter k is fixed, and only corrects setup parameter p, q.
That is, the standard value of setup parameter p, q is set to into P, Q, correction is set to into δ p, δ q, with the sum shown in following formula (3), (4)
Form correcting standard value P, Q.
[formula 3]
P+δp…(3)
[formula 4]
Q+δq…(4)
Hereinafter, with reference to Fig. 5, the flow process of the model parameter correcting process as one embodiment of the present invention is specifically entered
Row explanation.
Fig. 5 is the flow chart of the flow process of the model parameter correcting process for being denoted as one embodiment of the present invention.Fig. 5 institutes
The flow chart for showing processes the moment for finishing in blowing, and model parameter correcting process enters the process of step S1.
In the process of step S1, after model parameter correction portion 32a terminates via the acquirement blowing process of input and output portion 31
Furnace charge operation actual performance information.Thus, the process of step S1 terminates, and model parameter correcting process enters the process of step S2.
In the process of step S2, model parameter correction portion 32a uses the operation actual performance obtained in the process of step S1
Information, concentration of carbon (assay value) C in the molten steel at the end of calculating blowing process midway sampling moment and blowing processs、Ce, it is de-
Carbon oxygen efficiency dCs/dO2、dCe/dO2, and stirring gas impact factor alphas、αe。
Specifically, if concentration of carbon is distinguished in the molten steel at the end of processing midway sampling moment and blowing process that will blow
It is set to Cs、Ce, then the decarburization oxygen efficiency dC at the end of blowing process midway sampling moment and blowing are processeds/dO2、dCe/dO2Energy
Enough exhaust actual achievements processed using blowing according to formula (5) shown below when midway samples moment and finishing blowing are counted
Calculate.
Wherein, pay attention to the flow of exhaust, the time delay of the analysis of constituent concentration.In addition, blowing is processed
Stirring gas at the end of midway sampling moment and blowing are processed affects factor alphas、αeIn being able to by the way that blowing is processed
Stirring gas flux unit consumption Vb at the end of way sampling moment and blowing are processed brings formula (2) into calculate.Thus,
The process of step S2 terminates, and model parameter correcting process carries out the process of step S3.
[formula 5]
dC/dO2=Vex×ρc/22.4*12.0/1000/Vo…(5)
Here, in formula (5), parameter Vex, Vo, ρcExtraction flow [Nm when representing that molten steel is analyzed respectively3/ Hr], send oxygen stream
Amount [Nm3/ Hr], exhaust in CO gases and CO2The concentration sum [%] of gas.More noise is included in these measured values
In the case of, it is possible to use moving average etc. implements the value of filtering process to replace, it is also possible to missed using having carried out deviateing
The value of poor amendment is replacing.
In the process of step S3, model parameter correction portion 32a pair is set using the value that calculates in the process of step S2
Determine parameter p, q to be modified, so that being imitated according to decarburization oxygen at the end of blowing processes the midway sampling moment and blowing is processed
The decarburization oxygen efficiency that rate model formation is calculated is little as much as possible relative to the error of actual achievement value.Wherein, in amendment setup parameter p, q
When, setup parameter p, q are made not with standard value P, Q away from larger.In the present embodiment, made according to the easy degree for calculating process
Setup parameter p, q are corrected with the error function J shown in following formula (6).
[formula 6]
Here, the Section 1 and Section 2 in formula (6) represent respectively according to blowing process midway sampling the moment and
The error of the decarburization oxygen efficiency that the decarburization oxygen efficiency model formation at the end of blowing process is calculated.By the result of step S2
Substituting into formula (1), transplanted, and obtain the difference on both sides of the equation obtained by the logarithm for calculating both sides becomes formula (6) formula
First, second.In addition, the Section 3 and Section 4 of formula (6) be not in order to make setup parameter p, q inclined from standard value P, Q
From too many and be added.Parameter σ in formula (6)s, σe, σp, σqIt is the value of user's setting of this device, if parameter value is set
Obtain less, the error that can make the denominator of the corresponding item in formula (6) diminishes.As the example of the establishing method of the parameter,
Have and calculate every denominator value of formula (6) for multiple passing furnace charges, and calculate for respective standard deviation, by these values
As the method for the setting value of above-mentioned parameter.
In managing in this place, correction δ p, δ q of setup parameter p, q, error are determined in the way of minimizing error function J
Function J is because be the quadratic polynomial of correction δ p, δ q minimal solution can be calculated by inverse matrix calculating.It is concrete and
Speech, represents error function J with formula (7) shown below first.Here, in formula (7), x be using correction δ p, δ q as
The two-dimentional row vector of key element, D is 2 × 2 constant matrices, and E is two-dimentional constant row vector, and F is constant scalar item.The right shoulder of vector
T refer to transposition.
[formula 7]
J=xTDx+ETx+F…(7)
In the case where error function J is by above-mentioned formula (7) expression, in formula (8) shown below time error is set up
Function J takes minimum of a value.
[formula 8]
Formula (9) shown below can be obtained if the formula (8) is deformed.
[formula 9]
Because can calculate by the calculating making error function J become minimum correction δ p, δ q, with this formula is passed through
(3), (4) amendment setup parameter p, q.Even if additionally, using in the case of the error function J different from formula (7), if sharp
The corrected Calculation of setup parameter p, q then can be also carried out with non-linear optimization method etc..Thus, the process of step S3 terminates, mould
Shape parameter correcting process enters the process of step S4.
In the process of step S4, model parameter correction portion 32a is via input and output portion 31 by by the process of step S3
Revised setup parameter p, q are stored in parameter DB20c.Thus, the process of step S4 terminates, a series of model parameter amendment
Process terminates.
(sending oxygen amount calculating to process)
Next, carrying out to the flow process that oxygen amount calculates process of sending as one embodiment of the present invention with reference to Fig. 6, Fig. 7
Explanation.
Fig. 6 is that the oxygen amount of sending for being denoted as one embodiment of the present invention calculates the flow chart of the flow process for processing.Shown in Fig. 6
Flow chart control device 30 obtain blowing process midway sampling the moment molten steel analysis result moment, send oxygen amount meter
Calculate the process that process enters step S11.
In the process of step S11, passing process flexible strategy calculating part 33a distinguishes from operation DB20a and main information DB20b
Read the operation actual performance information and various setting values of passing furnace charge.Thus, the process of step S11 terminates, and send at oxygen amount calculating
Process of the reason into step S12.
In the process of step S12, passing process flexible strategy calculating part 33a selects blowing to process the stove of midway from passing furnace charge
The furnace charge of material identical species.Wherein, furnace charge is that identical type means that for example following point is identical.Thus, the process of step S12
Terminate, send oxygen amount to calculate the process that process enters step S13.
(1) processing intent is identical：De- P blows, de- C blowing, and common blowing (takes off P blowing and takes off C and blow while entering
Any one in OK)
(2) the target concentration of carbon and target temperature of terminal belongs to identical scope (threshold value of scope is stored in main information
DB20b)
(3) the blowing process execution day is present within given number of days apart
In the process of step S13, the passing flexible strategy calculating part 33a that processes calculates what is selected in the process of step S12
Difference value between the operating condition of the furnace charge that the operating condition of passing furnace charge and blowing process midway, and according to operating condition
Difference value order from small to large is ranked up to furnace charge, specifies from the beginning selection of the passing furnace charge for having sorted and counts the passing of N
Furnace charge.Additionally, difference value can for example pass through formula (10) shown below calculating.ε (i) tables shown in following formula (10)
The operating condition for showing i-th passing furnace charge processes the difference of the operating condition of the furnace charge of midway with blowing, by the difference of operating condition
The weighted sum of different square value is constituted.
In formula (10), parameter xp(p=1～n) represents that blowing processes p-th operation actual performance information of the furnace charge of midway
(measurement information of blowing before processing molten steel, the molten steel assay value at blowing process midway sampling moment, blowing are processed when sampling halfway
Scheduled operation amount (stirring gas flow etc.) at the end of the operational ton (stirring gas flow etc.) at quarter and blowing process), parameter
x'i、pRepresent p-th operation actual performance information of i-th passing furnace charge (at the measurement information of blowing before processing molten steel, blowing
Reason midway sampling the moment molten steel assay value, blowing process midway sampling the moment operational ton (stirring gas flow etc.) and
Operational ton actual achievement (stirring gas flow etc.) at the end of blowing process), parameter WpRepresent weight coefficient.The value of ε (i) is less, more
Become the passing furnace charge of the operating condition similar to the operating condition that blowing processes midway furnace charge.Thus, the process knot of step S13
Beam, send oxygen amount to calculate the process that process enters step S14.
[formula 10]
ε (i)=W1×(x1-x′I, 1)^2+W2×(x2-x′I, 2)^2+W3×(x3-x′I, 3)^2+...+Wn×(xn-x′I, n)^
2…(10)
In the process of step S14, passing process flexible strategy calculating part 33a is respectively directed to selected in the process of step S13
The N number of passing furnace charge selected out, calculates value d shown in following formula (11)i(i=1～N).Value diIt is to represent that blowing processes midway
Furnace charge processes similar degree (the model class of the decarburization oxygen efficiency model formation of the passing furnace charge i at midway sampling moment relative to blowing
Like spend) value.In formula (11), parameter pi、qiExpression carries out calculated setup parameter p, q to passing furnace charge i, is deposited
It is stored in parameter DB20c.
Parameter Cs, dCs/dO2, αsRespectively be blowing process midway furnace charge molten steel in concentration of carbon, decarburization oxygen efficiency and
Stirring gas affect coefficient, according to operation actual performance information by with model parameter correcting process in step S2 process identical
Process to calculate.If value diInformation fully meets the de- of passing furnace charge i when the molten steel that the furnace charge of midway is processed for 0 blowing is analyzed
Carbon oxygen efficiency model formation.In addition, value d also can be weighted and is added on to the item in the formula of difference value ε (i)iFormula.By
This, the process of step S14 terminates, and send oxygen amount to calculate the process that process enters step S15.
[formula 11]
In the process of step S15, passing process flexible strategy calculating part 33a using the process of step S14 by will be calculated
Model similar degree diThe N number of passing furnace charge that the process for bringing following formula (12) into calculate by step S13 is selected
Flexible strategy wi(i=1～N).Here, parameter d in formula (12)maxMean diThe maximum of (i=1～N).Thus, step S15
Process terminate, send oxygen amount calculate process enter step S16 process.
[formula 12]
In the process of step S16, model parameter generating unit 33b is counted using formula (13) shown below in converting process
Calculate setup parameter p, q related to the furnace charge that blowing processes midway.And, model formation calculating part 34 is according to decarburization oxygen efficiency mould
Type formula calculates decarburization oxygen efficiency using setup parameter p, q for calculating.Thus, the process of step S16 terminates, and send oxygen amount meter
Calculate the process that process enters step S17.
[formula 13]
In the process of step S17, decarburization oxygen of the oxygen amount calculating part 33c using calculating by the process of step S16 is sent
Efficiency calculation is required after blowing processes the midway sampling moment to send oxygen amount (required to send oxygen amount), and by result of calculation to control
Terminal 10 and display device 50 are exported.Here, because the inverse of decarburization oxygen efficiency changes needed for (reduction) 1% with concentration of carbon
Amount of oxygen (the Nm of per unit molten steel3/ ton) it is equal, if so dense to aim carbon from concentration of carbon in the molten steel of blowing process midway
Spend and the reciprocal value of decarburization oxygen efficiency be integrated, then can calculate in order that in molten steel concentration of carbon reach target concentration of carbon and
Required send oxygen amount (per unit molten steel).
Specifically, oxygen amount calculating part 33c is sent to read the predetermined blender gas that blowing processes the furnace charge of midway from operation DB20a
Body flow.In the present embodiment, as shown in fig. 7, predetermined stirring gas flow is to send oxygen amount (to send the oxygen amount that oxygen terminates by accumulative
Aggregate-value) determine for each interval setting value.Here, VOSRefer to that blowing processes midway sampling the accumulative of moment and send oxygen
Amount.Additionally, in the figure 7, unit stirring gas flow is from V after blowing processes the analysis of midway molten steelb3 are changed to Vb4.At this
Sample unit stirring gas flow send oxygen amount in the case where blowing processes midway change needed for the calculating as so following.
Unit stirring gas flow Vs of the oxygen amount calculating part 33c using the moment is sampled according to blowing midway is sent firstb3 and calculate
The impact factor alpha that formula (2) is calculatedsAnd setup parameter p, the q calculated by the process of step S16 adds up to send to calculate
Oxygen amount is VOConcentration of carbon C in molten steel when 33.Concentration of carbon C in the molten steel3Formula (14) shown below can be passed through to calculate.This
Outward, parameter Y in formula (14) is represented by formula (15) shown below.And, send oxygen amount calculating part 33c to be stirred according to unit
Mix gas flow Vb4 and formula (2) carry out calculating influence coefficient α4, and according to impact factor alpha4Calculate with setup parameter p, q to calculating
The reciprocal value of the decarburization oxygen efficiency model formation shown in formula (1) concentration of carbon C from molten steel3To aim carbon concentration CeBe integrated and
The value for obtaining.
Because the value is in order that concentration of carbon C concentration of carbon C from molten steel in molten steel3Drop to aim carbon concentration CeTill and
The amount of oxygen of required per unit molten steel weight, so being multiplied by molten steel weight by the value can calculate required oxygen amount Δ O2 f.Most
Eventually in order that concentration of carbon C concentration of carbon C from molten steel in molten steel3Drop to aim carbon concentration CeRequired amount of oxygen is (Δ O2+Δ
O2 f).Illustrate unit stirring gas flow in the present embodiment only to change once after blowing processes the midway sampling moment
Example, also can be calculated with same process in the case of repeatedly change.Additionally, integral and calculating recited above is used
Repeatedly calculate carry out can also, analytical Calculation can also.Thus, the process of step S17 terminates, a series of to send at oxygen amount calculating
Reason terminates.
[formula 14]
[formula 15]
As the explanation according to more than is recognized, for bessemerizing equipment as one embodiment of the present invention
Control device 30 for because using exhaust flow, constituent concentration come set decarburization oxygen efficiency model formation setting join
Number, it is possible to considering that blowing processes the passage change of reaction and accurately calculates decarburization oxygen efficiency.In addition, because control dress
Put 30 and add stirring gas flow to the variable of decarburization oxygen efficiency model formation, the change of the stirring gas flow in processing blowing
The impact of change is reacted to decarburization oxygen efficiency model formation, it is possible to accurately calculating decarburization oxygen efficiency.Thereby, it is possible to precision
Highland calculates decarburization oxygen efficiency, can precision highland blowing is processed at the end of molten steel in concentration of carbon to be controlled to aim carbon dense
Degree.
(embodiment)
Apply the present invention to the offline actual achievement data of converter and carry out its precision test.For more than 100 furnace charge meter
Calculate from blowing process midway sampling the moment molten steel in concentration of carbon to target concentration of carbon needed for send oxygen amount and with send oxygen amount
Actual achievement compares.As a result, confirming that oxygen can be sent by required compared with conventional art (in operation group fixed model parameter)
The error of amount averagely reduces more than 50%.
Industrial utilization possibility
The present invention can be applied in order to concentration of carbon becomes target concentration of carbon and controls in the molten steel at the end of processing that blows
Blowing processes the process for sending oxygen amount of the furnace charge after the sampling moment of midway.
Claims (4)
1. a kind of control device for bessemerizing equipment, is carried out to the oxygen amount of sending of the furnace charge after the blowing process midway sampling moment
Control, so that concentration of carbon becomes target concentration of carbon in the molten steel at the end of blowing is processed,
The control device for bessemerizing equipment is characterised by possessing：
Model formation calculating part, it utilizes and at least concentration of carbon in molten steel and stirring gas flow are set to into input variable and will take off
Carbon oxygen efficiency is set to output variable and has the model formation of more than one setup parameter calculating decarburization oxygen efficiency；
Model parameter correction portion, it is directed to the multiple passing furnace charge after blowing process terminates, when processing midway sampling using blowing
The constituent concentration of concentration of carbon, the flow of exhaust and exhaust in molten steel at the end of quarter and blowing process, to above-mentioned setting
At least one of parameter is modified；
Passing process flexible strategy calculating part, its operating condition for being based on the multiple passing furnace charge after blowing process terminates is processed with blowing
During furnace charge operating condition difference and blowing process midway furnace charge relative to blowing process midway sampling the moment
Passing furnace charge model formation similar degree calculating the flexible strategy of each passing furnace charge；
Model parameter generating unit in converting process, it is using by the revised each passing furnace charge of above-mentioned model parameter correction portion
Setup parameter and passing process the flexible strategy of each passing furnace charge that flexible strategy calculating part calculates and processed calculating blowing by above-mentioned
The setup parameter of the furnace charge in journey；And
Oxygen amount calculating part is sent, during it uses decarburization oxygen efficiency to calculate the blowing process that blowing was processed after the sampling moment of midway
The send oxygen amount, above-mentioned decarburization oxygen efficiency of the furnace charge on way uses the carbon in blowing processes the molten steel that halfway the sampling moment measures dense
Degree, target concentration of carbon and the setup parameter calculated by model parameter generating unit in above-mentioned converting process and by above-mentioned mould
Type formula calculating part is calculated.
2. the control device for bessemerizing equipment according to claim 1, it is characterised in that
Above-mentioned model parameter correction portion amendment setup parameter, so that in the molten steel that blowing processes that the midway sampling moment measures
Concentration of carbon and make the blowing that above-mentioned model formation is set up process the difference of concentration of carbon, blowing in the molten steel at midway sampling moment to process knot
In molten steel at the end of concentration of carbon is processed with the blowing for setting up above-mentioned model formation in the molten steel measured during beam concentration of carbon it
The weighted sum of squares of the difference of difference and each setup parameter and standard value is minimized.
3. the control device for bessemerizing equipment according to claims 1 or 2, it is characterised in that
Above-mentioned passing process flexible strategy calculating part includes that blowing is processed at midway sampling moment and blowing in above-mentioned operating condition
The stirring gas flow of tight front per unit molten steel weight at the end of reason.
4. a kind of control method for bessemerizing equipment, is carried out to the oxygen amount of sending of the furnace charge after the blowing process midway sampling moment
Control, so that concentration of carbon becomes target concentration of carbon in the molten steel at the end of blowing is processed,
It is described bessemerize the control method of equipment characterized in that, including：
Amendment step, in above-mentioned amendment step, the multiple passing furnace charge after terminating for blowing process, in being processed using blowing
The constituent concentration of concentration of carbon, the flow of exhaust and exhaust in molten steel at the end of way sampling moment and blowing process, it is right to come
At least concentration of carbon in molten steel and stirring gas flow are set to into input variable and decarburization oxygen efficiency is set to into the mould of output variable
At least one of setup parameter of type formula is modified；
Flexible strategy calculation procedure, in above-mentioned flexible strategy calculation procedure, the operation of the multiple passing furnace charge after being terminated based on blowing process
Condition with blowing processing procedure in furnace charge operating condition difference and blowing process midway furnace charge relative to blowing at
The similar degree of the model formation of the passing furnace charge at reason midway sampling moment is calculating the flexible strategy of each passing furnace charge；
Parameter calculation procedure, in above-mentioned parameter calculation procedure, using revised each passing furnace charge in above-mentioned amendment step
Setup parameter and each passing furnace charge calculated in above-mentioned flexible strategy calculation procedure flexible strategy come calculate blowing process in stove
The setup parameter of material；And
Calculate using decarburization oxygen efficiency the blowing that blowing processed after the sampling moment of midway and process the furnace charge of midway and send oxygen amount
The step of, above-mentioned decarburization oxygen efficiency is dense using concentration of carbon, aim carbon in processing the molten steel that halfway the sampling moment measures in blowing
Degree and the setup parameter that calculates in above-mentioned parameter calculation procedure are simultaneously calculated by above-mentioned model formation.
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| JP2013-204284 | 2013-09-30 | ||
| JP2013204284 | 2013-09-30 | ||
| PCT/JP2014/073218 WO2015045766A1 (en) | 2013-09-30 | 2014-09-03 | Control device and control method for converter furnace blowing equipment |
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| CN105593381B true CN105593381B (en) | 2017-05-10 |
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| KR (1) | KR101657930B1 (en) |
| CN (1) | CN105593381B (en) |
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| JP6376200B2 (en) * | 2015-11-02 | 2018-08-22 | Ｊｆｅスチール株式会社 | Molten state estimation device, molten state estimation method, and molten metal manufacturing method |
| KR102133215B1 (en) * | 2016-03-23 | 2020-07-13 | 닛폰세이테츠 가부시키가이샤 | Method for preliminary chartering and control device for chartering |
| WO2019181562A1 (en) * | 2018-03-19 | 2019-09-26 | Ｊｆｅスチール株式会社 | Molten metal component estimation device, molten metal component estimation method, and molten metal production method |
| WO2019230657A1 (en) * | 2018-05-28 | 2019-12-05 | 日本製鉄株式会社 | Converter blowing method |
| CN111079537B (en) * | 2019-11-18 | 2023-09-26 | 中冶赛迪技术研究中心有限公司 | Method, system, machine-readable medium and equipment for identifying smelting working conditions of converter |
| TWI697564B (en) * | 2019-12-09 | 2020-07-01 | 財團法人金屬工業研究發展中心 | Heat treatment furnace |
| CN115125358B (en) * | 2021-03-25 | 2023-09-12 | 宝山钢铁股份有限公司 | Automatic weighing virtual bin control method for converter alloy |
| CN116356101B (en) * | 2023-04-28 | 2024-03-22 | 福建三宝钢铁有限公司 | Smelting process with high oxygen supply strength |
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| JP3882705B2 (en) * | 2002-07-25 | 2007-02-21 | Ｊｆｅスチール株式会社 | Converter blowing control method |
| KR101008072B1 (en) * | 2003-09-05 | 2011-01-13 | 주식회사 포스코 | Method for Refinig Molten Pig Iron in Converter |
| JP4998661B2 (en) * | 2005-01-28 | 2012-08-15 | Ｊｆｅスチール株式会社 | Converter blowing end point control method |
| JP2009052082A (en) * | 2007-08-27 | 2009-03-12 | Jfe Steel Kk | Method for deciding oxygen feeding flow rate pattern in converter dephosphorization blowing |
| JP2010007150A (en) * | 2008-06-30 | 2010-01-14 | Jfe Steel Corp | Method for estimating carbon concentration in molten steel |
| JP5527180B2 (en) * | 2010-11-29 | 2014-06-18 | 新日鐵住金株式会社 | Converter blowing method and converter blowing system |
| CN102373310B (en) * | 2011-10-19 | 2013-06-12 | 北京科技大学 | Method for guiding converter reblowing process operation |
| CN103194574B (en) * | 2012-12-17 | 2014-06-11 | 西安电子科技大学 | Dynamic regulation method of VOD refined end point carbon content prediction model |
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| WO2015045766A1 (en) | 2015-04-02 |
| JPWO2015045766A1 (en) | 2017-03-09 |
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| CN105593381A (en) | 2016-05-18 |
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