CN106636530B - A kind of pneumatic steelmaking Study of Temperature Forecasting method and server - Google Patents
A kind of pneumatic steelmaking Study of Temperature Forecasting method and server Download PDFInfo
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- CN106636530B CN106636530B CN201611020342.5A CN201611020342A CN106636530B CN 106636530 B CN106636530 B CN 106636530B CN 201611020342 A CN201611020342 A CN 201611020342A CN 106636530 B CN106636530 B CN 106636530B
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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
- C21C5/30—Regulating or controlling the 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
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
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- 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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Abstract
The present invention discloses a kind of pneumatic steelmaking Study of Temperature Forecasting method and server.Wherein, which comprises obtain the steel-making information of current converter, steel-making information includes loading data, the data that feed intake, steel information data and the furnace gas data of current heat；According to the loading data, the data that feed intake, steel information data and furnace gas data and the theoretical model established according to material balance and heat balance principle, calculates and obtain the first liquid steel temperature；According to the current heat information of the steel-making acquisition of information of current converter, and obtain the history heat information of the first preset quantity；According to the history heat information of current heat information and the first preset quantity, calculates and obtain the second liquid steel temperature；According to the first liquid steel temperature and the second liquid steel temperature, the molten steel for obtaining current heat estimates temperature.The server is for executing the above method.Pneumatic steelmaking Study of Temperature Forecasting method and server provided by the invention reduce BOF Steelmaking Endpoint temperature control cost.
Description
Technical field
The present invention relates to metallurgical technology fields, and in particular to a kind of pneumatic steelmaking Study of Temperature Forecasting method and server.
Background technique
In converter steelmaking process, converting process temperature and outlet temperature are rationally controlled, to quality of molten steel, converter producing group
It knits and converter lining life has important influence.
In order to realize that BOF Steelmaking Endpoint temperature controls the target of high hit rate, bessemerizes and grasped by pervious artificial experience
Make to develop to automatic Steelmaking direction.Currently, the more commonly used method of steel mill is process for making mathematical model combination dynamic detection
Equipment feeds back to steel-making mathematical model by will test the collected smelting process information of equipment, and steel-making mathematical model utilizes this
A little information reach the target for improving outlet temperature hit rate to continuous correction model.Current more commonly used dynamic detection hand
Section has sublance and method of dropping a bomb.Mammoth conveter can use sublance, and mini-medium BOF plants are limited by converter mouth, can not install sublance
This dynamic detecting equipment.It is dropped a bomb formula detection technique for mini-medium BOF plants using converter, in the not in the case where of falling furnace to converter
Steel-making outlet temperature is controlled.Either sublance method equipment investment expense of still dropping a bomb is relatively high.
In addition, this method is for shortage dynamic prior art discloses a kind of method of auxiliary forecast BOF Steelmaking Endpoint
The mini-medium BOF plants of detection device can be according to bessemerizing original metal using industrial control computer and process database
Material is packed into information and endpoint molten steel target carbon content and each auxiliary material additional amount of temperature computation and oxygen consumption；Believed according to converting process
Breath calculates converting process molten bath carbon content and temperature in real time；Molten steel Mn, P and S element is calculated when blowing reaches terminal to contain
Amount.The disadvantages are as follows: only carry out end Temperature Prediction of Molten Steel in the method for theoretical model, in steel mill's temperature in actual use
Forecast that hit rate is very low.
Therefore, how to propose a kind of method, can reduce BOF Steelmaking Endpoint temperature control cost, become industry and urgently solve
Important topic certainly.
Summary of the invention
For the defects in the prior art, the present invention provides a kind of pneumatic steelmaking Study of Temperature Forecasting method and server.
On the one hand, the present invention proposes a kind of pneumatic steelmaking Study of Temperature Forecasting method, comprising:
The steel-making information of current converter is obtained, the steel-making information includes the loading data of current heat, the data that feed intake, steel
Kind information data and furnace gas data；
According to the loading data, the data that feed intake, steel information data and furnace gas data and according to material balance and heat
The theoretical model that equilibrium principle is established calculates and obtains the first liquid steel temperature；
According to the current heat information of the steel-making acquisition of information of the current converter, and obtain the history furnace of the first preset quantity
Secondary information；
According to the history heat information of the current heat information and first preset quantity, calculates and obtain the second molten steel
Temperature；
According to first liquid steel temperature and second liquid steel temperature, the molten steel for obtaining the current heat estimates temperature
Degree.
On the other hand, the present invention provides a kind of server, comprising:
First acquisition unit, for obtaining the steel-making information of current converter, the steel-making information includes the dress of current heat
Enter data, the data that feed intake, steel information data and furnace gas data；
First computing unit, for according to the loading data, the data that feed intake, steel information data and furnace gas data and
According to the theoretical model that material balance and heat balance principle are established, calculates and obtain the first liquid steel temperature；
Second acquisition unit for the current heat information of steel-making acquisition of information according to the current converter, and obtains the
The history heat information of one preset quantity；
Second computing unit, for being believed according to the history heat of the current heat information and first preset quantity
Breath calculates and obtains the second liquid steel temperature；
Unit is estimated, for obtaining the current heat according to first liquid steel temperature and second liquid steel temperature
Molten steel estimate temperature.
Pneumatic steelmaking Study of Temperature Forecasting method and server provided by the invention, due to that can be believed by the steel-making of current converter
Breath obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, respectively further according to the first liquid steel temperature and the second steel
The molten steel that coolant-temperature gage obtains current heat estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is this hair
Bright some embodiments for those of ordinary skill in the art without creative efforts, can be with root
Other attached drawings are obtained according to these attached drawings.
Fig. 1 is the flow diagram of one embodiment of the invention pneumatic steelmaking Study of Temperature Forecasting method；
Fig. 2 is the flow diagram of another embodiment of the present invention pneumatic steelmaking Study of Temperature Forecasting method；
Fig. 3 is the structural schematic diagram of one embodiment of the invention server；
Fig. 4 is the structural schematic diagram of another embodiment of the present invention server.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, below in conjunction with attached in the embodiment of the present invention
Figure, technical solution in the embodiment of the present invention are explicitly described, it is clear that described embodiment is a part of the invention
Embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making wound
Every other embodiment obtained under the premise of the property made labour, shall fall within the protection scope of the present invention.
Fig. 1 is the flow diagram of one embodiment of the invention pneumatic steelmaking Study of Temperature Forecasting method, as shown in Figure 1, of the invention
The pneumatic steelmaking Study of Temperature Forecasting method of offer, comprising:
S101, the steel-making information for obtaining current converter, the steel-making information includes the loading data of current heat, feed intake number
According to, steel information data and furnace gas data；
Specifically, server can chemically examine chamber system by oxygen rifle, feed bin, combustion gas analyzer, steel mill and be manually entered
Mode obtains the steel-making information of current converter, and the steel-making information includes loading data, the data that feed intake, the steel grade letter of current heat
Cease data and furnace gas data.The loading data include weight of molten iron, molten iron temperature, hot metal composition, the molten iron quantity of slag, variety classes
Steel scrap weight, upper furnace stay the quantity of slag；The data that feed intake are the weight of the various auxiliary materials put into converting process, and the auxiliary material includes
Lime, light dolomite, ore, lime stone and dolomite；The steel information data include molten steel target temperature, molten steel target
Carbon content；The furnace gas data are furnace gas real-time CO and CO in converting process2Content ratio.
S102, according to the loading data, the data that feed intake, steel information data and furnace gas data and according to material balance
And the theoretical model that heat balance principle is established, it calculates and obtains the first liquid steel temperature；
Specifically, the server theorizes model according to material balance and equilibrium principle, specific thermal balance type are as follows:
Molten iron heat+element reaction heat release=lime heat absorption+light dolomite heat absorption+ore heat absorption+lime stone heat absorption+dolomite heat absorption
+ converting process heat waste+blowing waits heat waste+thermal compensation item+upper furnace to stay slag heat absorption+slag steel heat absorption+molten steel slag heat absorption+molten steel physics
Heat+clinker physics thermal change.The server is by the loading data, the data that feed intake, steel information data and the furnace gas of acquisition
Data are input in the theoretical model, can be calculated and be obtained the first liquid steel temperature.The first liquid steel temperature expression passes through meter
The liquid steel temperature at the current heat a certain moment estimated.
S103, the current heat information of steel-making acquisition of information according to the current converter, and obtain the first preset quantity
History heat information；
Specifically, the server is described according to the available current heat information of steel-making information of the current converter
Current heat information includes current heat weight of molten iron, current heat steel scrap weight, current heat molten iron temperature, current heat iron
Water silicon content etc..The server obtains the history heat information of the first preset quantity, such as the server is from data base set
System obtains the history heat information, the history heat information include history heat weight of molten iron, history heat steel scrap weight,
History heat molten iron temperature, history heat molten iron silicon content etc..The current heat information and each described history heat letter
Manner of breathing is corresponding.The current heat information and the history heat information are chosen according to the actual situation, and the present embodiment does not limit.
First preset quantity can be set according to the actual situation, and the present embodiment does not limit.
S104, according to the history heat information of the current heat information and first preset quantity, calculate and obtain the
Two liquid steel temperatures；
Specifically, the server is believed according to the current heat information of acquisition and the history heat of first preset quantity
Breath can calculate and obtain the second liquid steel temperature.Second liquid steel temperature is represented according to the current heat information and described
History heat information, by the liquid steel temperature for calculating the current heat a certain moment estimated.
S105, according to first liquid steel temperature and second liquid steel temperature, the molten steel for obtaining the current heat is pre-
Estimate temperature.
Specifically, the server is obtained according to first liquid steel temperature and second liquid steel temperature that obtain is calculated
The molten steel for obtaining the current heat estimates temperature.For example, T1For first liquid steel temperature, T2For second liquid steel temperature, α
For T1Corresponding weight, β T2Corresponding weight, the molten steel estimate temperature T=α * T1+β*T2, wherein alpha+beta=1.
Pneumatic steelmaking Study of Temperature Forecasting method provided by the invention, due to that can be distinguished by the steel-making information of current converter
It obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, obtained further according to the first liquid steel temperature and the second liquid steel temperature
The molten steel of proper preceding heat estimates temperature, does not need the hardware detection costly using prices such as sublances, reduces converter
It makes steel outlet temperature and controls cost.
Fig. 2 is the flow diagram of another embodiment of the present invention pneumatic steelmaking Study of Temperature Forecasting method, as shown in Fig. 2, upper
On the basis of stating each embodiment, further, the history according to the current heat information and first preset quantity
Heat information, obtaining the second liquid steel temperature includes:
S1041, information is made steel according to the first history of the first current steel-making information and each history heat, calculates separately and works as
The difference angle value of preceding heat and each history heat；Wherein, the current heat information includes the described first current steel-making information,
The history heat information includes the first history steel-making information, and the described first current steel-making information and the steel-making of the first history are believed
Manner of breathing is corresponding；
Specifically, the server currently makes steel the first history of information and each history heat according to first got
Information is made steel, calculates the history heat of first preset quantity and the difference angle value of current heat one by one；Wherein, described current
Heat information includes the described first current steel-making information, and the history heat information includes the first history steel-making information, institute
It is corresponding with the first history steel-making information to state the first current steel-making information；Described first current steel-making information may include working as forehearth
Secondary weight of molten iron, current heat steel scrap weight, current heat molten iron temperature, current heat molten iron silicon content etc.；Described first goes through
It may include history heat weight of molten iron, history heat steel scrap weight, history heat molten iron temperature, history heat that history, which makes steel information,
Molten iron silicon content etc..Described first current steel-making information and first history steel-making information are chosen according to the actual situation, this reality
Apply example without limitation.
S1042, according to the calculated result of the difference angle value, choose the history of the smallest second preset quantity of difference angle value
Heat, which is used as, refers to heat, and calculates separately each weight with reference to heat according to the difference angle value with reference to heat；
Specifically, the server is after calculating the difference angle value for obtaining first preset quantity, in the diversity factor
In the calculated result of value, select with the history heat of the smallest second preset quantity of current heat difference angle value as with reference to furnace
It is secondary, for example, choose the smallest history heat of 2 difference angle value be used as refer to heat, the smaller corresponding history heat of difference angle value with
The similarity degree of the current heat is higher.Server calculates separately often further according to the difference angle value with reference to heat of selection
A weight with reference to heat.Second preset quantity can be set according to the actual situation, and the present embodiment does not limit.
S1043, information is made steel according to the second current steel-making information and each the second history with reference to heat, calculated separately every
A reference temperature with reference to the corresponding current heat of heat；Wherein, the current heat information includes the described second current steel-making
Information, the history heat information include the second history steel-making information, the described second current steel-making information and described second
It is corresponding that history makes steel information；
Specifically, the server currently makes steel information and each the second history with reference to heat according to second got
Information is made steel, calculates the reference temperature of the corresponding current heat of reference heat of second preset quantity one by one.Wherein, described
Current heat information includes the described second current steel-making information, and the history heat information includes the second history steel-making letter
Breath, the described second current steel-making information are corresponding with second history steel-making information；Described second current steel-making information can be with
Including current heat weight of molten iron, current heat steel scrap weight, current heat molten iron temperature, current heat molten iron silicon content, when
Preceding heat auxiliary material weight, the real-time oxygen amount of current heat etc.；The second history steel-making information may include with reference to heat molten iron weight
Amount, with reference to heat steel scrap weight, with reference to heat molten iron temperature, with reference to heat molten iron silicon content, with reference to heat auxiliary material weight, reference
Heat one falls oxygen amount etc..Described second current steel-making information and second history steel-making information are chosen according to the actual situation, this
Embodiment is without limitation.
S1044, according to each reference temperature and corresponding reference with reference to the corresponding current heat of heat
The weight of heat calculates second liquid steel temperature.
Specifically, the server according to each reference temperature with reference to the corresponding current heat of heat of acquisition with
And the corresponding weight of the reference temperature, calculate second liquid steel temperature.For example, the server, which can calculate, obtains each institute
The product of reference temperature with corresponding weight is stated, then is summed to above-mentioned product, second liquid steel temperature is calculated.
Pneumatic steelmaking Study of Temperature Forecasting method provided by the invention, due to that can be distinguished by the steel-making information of current converter
It obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, obtained further according to the first liquid steel temperature and the second liquid steel temperature
The molten steel of proper preceding heat estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.By selecting corresponding parameter meter
The second liquid steel temperature is calculated, the second liquid steel temperature is help to obtain.
On the basis of the various embodiments described above, further, the described first current steel-making information includes:
WtsnCurrent heat weight of molten iron, WfgnCurrent heat steel scrap weight, TempnCurrent heat molten iron temperature, Tssin-
Current heat molten iron silicon content, TsmnnCurrent heat molten iron manganese content, TspnCurrent heat molten iron phosphorus content；
First history makes steel information
Wtsi-History heat weight of molten iron, WfgiHistory heat steel scrap weight, TempiHistory heat molten iron temperature, Tssii-
History heat molten iron silicon content, TsmniHistory heat molten iron manganese content, TspiHistory heat molten iron phosphorus content；
Correspondingly, information is made steel according to first history of the described first current steel-making information and each history heat,
The difference angle value for calculating separately current heat and each history heat includes:
Si=a* | Wtsn-Wtsi|+b*|Wfgn-Wfgi|+c*|Tempn-Tempi|+d*|Tssin-Tssii|+e*|Tsmnn-Tsmni|+
f*|Tspn-Tspi|
Wherein, SiIndicate the difference angle value of i-th of history heat, i is positive integer and i is less than or equal to first present count
Amount, a, b, c, d, e and f are empirical coefficient.
Specifically, the server is according to formula Si=a* | Wtsn-Wtsi|+b*|Wfgn-Wfgi|+c*|Tempn-Tempi|+d*|
Tssin-Tssii|+e*|Tsmnn-Tsmni|+f*|Tspn-Tspi|, calculate the difference angle value of i-th of history heat, wherein i is positive whole
Number and i are less than or equal to first preset quantity, and a, b, c, d, e and f are empirical coefficient, and a, b, c, d, e and f of different converters are not
Together, each converter can obtain the empirical coefficient of the converter, W through testingtsnFor current heat weight of molten iron, WtsiFor history heat
Weight of molten iron, WfgnFor current heat steel scrap weight, WfgiFor history heat steel scrap weight, TempnFor current heat molten iron temperature,
TempiFor history heat molten iron temperature, TssinFor current heat molten iron silicon content, TssiiFor history heat molten iron silicon content, Tsmnn
For current heat molten iron manganese content, TsmniFor history heat molten iron manganese content, TspnFor current heat molten iron phosphorus content, TspiTo go through
History heat molten iron phosphorus content.The server calculates the first preset quantity history furnace according to the calculation formula of difference angle value
Secondary difference angle value, in order to the selection with reference to heat.
Pneumatic steelmaking Study of Temperature Forecasting method provided by the invention, due to that can be distinguished by the steel-making information of current converter
It obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, obtained further according to the first liquid steel temperature and the second liquid steel temperature
The molten steel of proper preceding heat estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost；By the meter for setting difference angle value
Formula is calculated, is conducive to quickly calculate difference angle value.
On the basis of the various embodiments described above, further, the weight with reference to heat calculates according to the following formula to be obtained
:
Wherein QiIndicate i-th of weight with reference to heat, SiIt indicates to refer to furnace i-th
Secondary difference angle value, i are positive integer, and n is equal to second preset quantity.
Specifically, the server is according to the difference angle value of the reference heat of acquisition, according to formulaCalculate i-th of weight with reference to heat, SiIndicate i-th of difference angle value with reference to heat, i is
Positive integer, n are equal to second preset quantity.Above-mentioned formula calculating process is illustrated below, for example, described
Server obtains the 1st difference angle value 0.8 and the 2nd difference angle value 1.2 with reference to heat with reference to heat, and the 1st refers to furnace
Secondary weight Q1=1-0.8/ (0.8+1.2)=0.6, the 2nd weight Q with reference to heat2=1-1.2/ (0.8+1.2)=0.4.
Pneumatic steelmaking Study of Temperature Forecasting method provided by the invention, due to that can be distinguished by the steel-making information of current converter
It obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, obtained further according to the first liquid steel temperature and the second liquid steel temperature
The molten steel of proper preceding heat estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.The power of heat is referred to by providing
The specific formula for calculation of weight is conducive to quickly calculate the weight for referring to heat.
On the basis of the various embodiments described above, further, the described second current steel-making information includes:
WtsnCurrent heat weight of molten iron, Wfgn-Current heat steel scrap weight, TempnCurrent heat molten iron temperature, Tssin-
Current heat molten iron silicon content, TsmnnCurrent heat molten iron manganese content, TspnCurrent heat molten iron phosphorus content, WshnWork as forehearth
Secondary lime weight, WqsnCurrent heat light dolomite weight, WksnCurrent heat ore weight, WsbnCurrent heat dolomite
Weight, WshsnCurrent heat lime stone weight, TonCurrent heat oxygen demand, CoconCurrent heat CO and CO2Total amount；
Second history makes steel information
WtsrRefer to heat weight of molten iron, WfgrRefer to heat steel scrap weight, TemprRefer to heat molten iron temperature, Tssir-
With reference to heat molten iron silicon content, TsmnrRefer to heat molten iron manganese content, TsprRefer to heat molten iron phosphorus content, WshrRefer to furnace
Secondary lime total weight, WqsrRefer to heat light dolomite total weight, WksrRefer to heat ore total weight, WsbrRefer to heat
Dolomite total weight, WshsrWith reference to heat lime stone total weight, TorRefer to heat one oxygen amount, CocorWith reference to heat CO with
CO2Total amount；
Correspondingly, described that information is made steel according to the described second current steel-making information and each second history, it calculates separately every
A reference temperature with reference to the corresponding current heat of heat includes:
Tz=h* (Wtsn-Wtsr)+j*(Wfgn-Wfgr)+k*(Tempn-Tempr)+m*(Tssin-Tssir)+p*(Tsmnn-Tsmnr)+
q*(Tspn-Tspr)+r*(Wshn-Wshr)+s*(Wgsn-Wgsr)+u*(Wksn-Wksr)+v*(Wsbn-Wsbr)+w*(Wshsn-Wshsr)+x*
(Ton-Tor)+y*(Cocon-Cocor)
Wherein, TiIndicate i-th of reference temperature with reference to the corresponding current heat of heat, i is positive integer and i is less than or equal to
Second preset quantity, h, j, k, m, p, q, r, s, u, v, w, x and y are empirical coefficient.
Specifically, the server is according to formula Tz=h* (Wtsn-Wtsr)+j*(Wfgn-Wfgr)+k*(Tempn-Tempr)+m*
(Tssin-Tssir)+p*(Tsmnn-Tsmnr)+q*(Tspn-Tspr)+r*(Wshn-Wshr)+s*(Wgsn-Wgsr)+u*(Wksn-Wksr)+v*
(Wsbn-Wsbr)+w*(Wshsn-Wshsr)+x*(Ton-Tor)+y*(Cocon-Cocor), it calculates z-th and works as forehearth with reference to heat is corresponding
Secondary reference temperature, z is positive integer and z is less than second preset quantity, and h, j, k, m, p, q, r, s, u, v, w, x and y are warp
Coefficient, h, j, k, m, p, q, r, s, u, v, w, x and the y difference of different converters are tested, each converter can obtain the converter through test
Empirical coefficient；WtsnFor current heat weight of molten iron, WtsrTo refer to heat weight of molten iron, WfgnFor current heat steel scrap weight,
WfgrTo refer to heat steel scrap weight, TempnFor current heat molten iron temperature, TemprTo refer to heat molten iron temperature, TssinIt is current
Heat molten iron silicon content, TssirTo refer to heat molten iron silicon content, TsmnnFor current heat molten iron manganese content, TsmnrFor with reference to furnace
Secondary molten iron manganese content, TspnFor current heat molten iron phosphorus content, TsprTo refer to heat molten iron phosphorus content, WshnFor current heat stone
Grey weight, WshrTo refer to heat lime total weight, WqsnFor current heat light dolomite weight, WqsrIt is light-burned with reference to heat
Dolomite total weight, WksnFor current heat ore weight, WksrTo refer to heat ore total weight, WsbnFor current heat white clouds
Stone weight, WsbrTo refer to heat dolomite total weight, WshsnFor current heat lime stone weight, WshsrTo refer to heat lime stone
Total weight, TonFor current heat oxygen demand, TorTo refer to heat one oxygen amount, CoconFor current heat CO and CO2Total amount, Cocor
To examine heat CO and CO2Total amount.
Pneumatic steelmaking Study of Temperature Forecasting method provided by the invention, due to that can be distinguished by the steel-making information of current converter
It obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, obtained further according to the first liquid steel temperature and the second liquid steel temperature
The molten steel of proper preceding heat estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost；By the meter for setting reference temperature
Formula is calculated, be conducive to quickly calculate reference temperature.
It is further, described according to first liquid steel temperature and second steel on the basis of the various embodiments described above
Coolant-temperature gage, the molten steel for obtaining current heat estimate temperature and include:
The sum of products of first liquid steel temperature and second liquid steel temperature and corresponding weighted value is calculated, is made
Molten steel for the current heat estimates temperature；Wherein, the corresponding weighted value of first liquid steel temperature and second molten steel
The sum of corresponding weighted value of temperature is equal to 1.
Specifically, the server can calculate the product of first liquid steel temperature and corresponding weight of acquisition, together
When calculate the product of second liquid steel temperature and corresponding weight, then sum to above-mentioned product, using the result of summation as institute
The molten steel for stating current heat estimates temperature.The corresponding weighted value of first liquid steel temperature is corresponding with second liquid steel temperature
The sum of weighted value is equal to 1.
Pneumatic steelmaking Study of Temperature Forecasting method provided by the invention, due to that can be distinguished by the steel-making information of current converter
It obtains data and calculates the first liquid steel temperature of acquisition and the second liquid steel temperature, obtained further according to the first liquid steel temperature and the second liquid steel temperature
The molten steel of proper preceding heat estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.Temperature is estimated by providing molten steel
Circular, be conducive to quickly calculate refer to heat weight.
Fig. 3 is the structural schematic diagram of one embodiment of the invention server, as shown in figure 3, server packet provided by the invention
It includes first acquisition unit 301, the first computing unit 302, second acquisition unit 303, the second computing unit 304 and estimates unit
305, in which:
First acquisition unit 301 is used to obtain the steel-making information of current converter, and the steel-making information includes current heat
It is packed into data, the data that feed intake, steel information data and furnace gas data；First computing unit 302 be used for according to the loading data,
Data, steel information data and the furnace gas data of feeding intake and the theoretical model established according to material balance and heat balance principle, meter
It calculates and obtains the first liquid steel temperature；Second acquisition unit 303 is used for the current heat of steel-making acquisition of information according to the current converter
Information, and obtain the history heat information of the first preset quantity；Second computing unit 304 is used for according to the current heat information
With the history heat information of first preset quantity, calculates and obtain the second liquid steel temperature；Unit 305 is estimated for according to
First liquid steel temperature and second liquid steel temperature, the molten steel for obtaining current heat estimate temperature.
Specifically, first acquisition unit 301 can by oxygen rifle, feed bin, combustion gas analyzer, steel mill chemically examine chamber system and
Manual input-mode obtains the steel-making information of current converter, and the steel-making information includes the loading data of current heat, feed intake number
According to, steel information data and furnace gas data.The loading data include weight of molten iron, molten iron temperature, hot metal composition, molten iron slag
Amount, variety classes steel scrap weight, upper furnace stay the quantity of slag；The data that feed intake are the weight of the various auxiliary materials put into converting process,
The auxiliary material includes lime, light dolomite, ore, lime stone and dolomite；The steel information data include molten steel target
Temperature, molten steel target carbon content；The furnace gas data are furnace gas real-time CO and CO in converting process2Content ratio.
First computing unit 302 theorizes model according to material balance and equilibrium principle, specific thermal balance type are as follows: iron
Hydro-thermal amount+element reaction heat release=lime heat absorption+light dolomite heat absorption+ore heat absorption+lime stone heat absorption+dolomite heat absorption+
Converting process heat waste+blowing waits heat waste+thermal compensation item+upper furnace to stay slag heat absorption+slag steel heat absorption+molten steel slag heat absorption+molten steel physics
Heat+clinker physics thermal change.First computing unit 302 by the loading data of acquisition, the data that feed intake, steel information data and
Furnace gas data are input in the theoretical model, can be calculated and be obtained the first liquid steel temperature.
Second acquisition unit 303 is described to work as according to the available current heat information of steel-making information of the current converter
Preceding heat information includes current heat weight of molten iron, current heat steel scrap weight, current heat molten iron temperature, current heat molten iron
Silicone content etc..Second acquisition unit 303 obtain the first preset quantity history heat information, such as second acquisition unit 303 from
Database Systems obtain the history heat information, and the history heat information includes history heat weight of molten iron, history heat
Steel scrap weight, history heat molten iron temperature, history heat molten iron silicon content etc..The current heat information and each described in go through
History heat information is corresponding.The current heat information and the history heat information are chosen according to the actual situation, the present embodiment
Without limitation.First preset quantity can be set according to the actual situation, and the present embodiment does not limit.
Second computing unit 304 is believed according to the current heat information of acquisition and the history heat of first preset quantity
Breath can calculate and obtain the second liquid steel temperature.
Specifically, the second computing unit 304 is according to the current heat information of acquisition and the history of first preset quantity
Heat information can calculate and obtain the second liquid steel temperature.Second liquid steel temperature indicate according to the current heat information and
The history heat information, by the liquid steel temperature for calculating the current heat a certain moment estimated.
Unit 305 is estimated according to first liquid steel temperature and second liquid steel temperature of acquisition, obtains current heat
Molten steel estimate temperature.
Specifically, unit 305 is estimated according to first liquid steel temperature and second liquid steel temperature that obtain is calculated, and is obtained
The molten steel for obtaining the current heat estimates temperature.For example, T1For first liquid steel temperature, T2For second liquid steel temperature, α
For T1Corresponding weight, β T2Corresponding weight estimates unit 305 and calculates the molten steel and estimates temperature T=α * T1+β*T2,
In, alpha+beta=1.
Server provided by the invention, due to that can obtain respectively data calculating by the steel-making information of current converter and obtain
The first liquid steel temperature and the second liquid steel temperature are obtained, the steel of current heat is obtained further according to the first liquid steel temperature and the second liquid steel temperature
Water estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.
Fig. 4 is the structural schematic diagram of another embodiment of the present invention server, on the basis of the above embodiments, further
Ground, second computing unit 304 include difference angle value computing unit 3041, weight calculation unit 3042, reference temperature calculating
Unit 3043 and the second liquid steel temperature computing unit 3044, in which:
Difference angle value computing unit 3041 is used for the first history according to the first current steel-making information and each history heat
Information is made steel, the difference angle value of current heat Yu each history heat is calculated separately；Wherein, the current heat information includes institute
The first current steel-making information is stated, the history heat information includes the first history steel-making information, the described first current steel-making
Information is corresponding with the first history steel-making information；Weight calculation unit 3042 is used for the calculated result according to the difference angle value,
The history heat for choosing the smallest second preset quantity of difference angle value, which is used as, refers to heat, and according to the difference with reference to heat
Angle value calculates separately each weight with reference to heat；Reference temperature computing unit 3043 be used for according to the second current steel-making information and
Each the second history with reference to heat makes steel information, calculates separately each reference temperature with reference to the corresponding current heat of heat；
Wherein, the current heat information includes the described second current steel-making information, and the history heat information includes described second going through
History makes steel information, and the described second current steel-making information is corresponding with second history steel-making information；Second liquid steel temperature calculates
Unit 3044 is used for according to each reference temperature with reference to the corresponding current heat of heat and corresponding refers to furnace
Secondary weight calculates second liquid steel temperature.
Specifically, difference angle value computing unit 3041 currently makes steel information and each history heat according to first got
The first history make steel information, calculate the history heat of first preset quantity and the difference angle value of current heat one by one；Its
In, the current heat information may include the described first current steel-making information, and the history heat information includes described first
History makes steel information, and the described first current steel-making information is corresponding with the first history steel-making information；Described first current steel-making letter
Breath includes current heat weight of molten iron, current heat steel scrap weight, current heat molten iron temperature, current heat molten iron silicon content
Deng；The first history steel-making information may include history heat weight of molten iron, history heat steel scrap weight, history heat molten iron
Temperature, history heat molten iron silicon content etc..Described first current steel-making information and first history steel-making information are according to reality
Situation is chosen, and the present embodiment does not limit.
Weight calculation unit 3042 is after calculating the difference angle value for obtaining first preset quantity, in the difference angle value
Calculated result in, select with the history heat of the smallest second preset quantity of current heat difference angle value as refer to heat,
Such as it chooses the smallest history heat of 2 difference angle value and is used as with reference to heat, the smaller corresponding history heat of difference angle value and institute
The similarity degree for stating current heat is higher.The difference angle value with reference to heat point of the weight calculation unit 3042 further according to selection
Each weight with reference to heat is not calculated.Second preset quantity can be set according to the actual situation, and the present embodiment is not
It limits.
Reference temperature computing unit 3043 is according to the current steel-making information and each with reference to the second of heat of second got
History makes steel information, calculates the reference temperature of the corresponding current heat of reference heat of second preset quantity one by one.Wherein,
The current heat information includes the described second current steel-making information, and the history heat information includes the second history steel-making
Information, the described second current steel-making information are corresponding with second history steel-making information；Described second current steel-making information can
With include current heat weight of molten iron, current heat steel scrap weight, current heat molten iron temperature, current heat molten iron silicon content,
Current heat auxiliary material weight, the real-time oxygen amount of current heat etc.；The second history steel-making information may include with reference to heat molten iron
Weight, with reference to heat steel scrap weight, with reference to heat molten iron temperature, with reference to heat molten iron silicon content, with reference to heat auxiliary material weight, ginseng
Examine the oxygen amount etc. of heat one.Described second current steel-making information and second history steel-making information are chosen according to the actual situation,
The present embodiment does not limit.
Second liquid steel temperature computing unit 3044 is according to each ginseng with reference to the corresponding current heat of heat of acquisition
Temperature and the corresponding weight of the reference temperature are examined, second liquid steel temperature is calculated.For example, the server can calculate
The product of each reference temperature and corresponding weight is obtained, then is summed to above-mentioned product, second liquid steel temperature is calculated.
Server provided by the invention, due to that can obtain respectively data calculating by the steel-making information of current converter and obtain
The first liquid steel temperature and the second liquid steel temperature are obtained, the steel of current heat is obtained further according to the first liquid steel temperature and the second liquid steel temperature
Water estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.By selecting corresponding parameter to calculate the second liquid steel temperature,
It help to obtain the second liquid steel temperature.
On the basis of the various embodiments described above, further, weight calculation unit 3042 is specifically used for:
According toEach weight with reference to heat is calculated, wherein QiIt indicates to refer to furnace i-th
Secondary weight, SiIndicate i-th of difference angle value with reference to heat, i is positive integer, and n is equal to second preset quantity.
Specifically, weight calculation unit 3042 is according to the difference angle value of the reference heat of acquisition, according to formulaCalculate i-th of weight S with reference to heatiIndicate i-th of difference angle value with reference to heat, i is
Positive integer, n are equal to second preset quantity.Above-mentioned formula calculating process is illustrated below, for example, weight
The acquisition of computing unit 3042 the 1st difference angle value 0.8 and the 2nd difference angle value 1.2 with reference to heat with reference to heat, the 1st
With reference to the weight Q of heat1=1-0.8/ (0.8+1.2)=0.6, the 2nd weight Q with reference to heat2=1-1.2/ (0.8+1.2)
=0.4.
Server provided by the invention, due to that can obtain respectively data calculating by the steel-making information of current converter and obtain
The first liquid steel temperature and the second liquid steel temperature are obtained, the steel of current heat is obtained further according to the first liquid steel temperature and the second liquid steel temperature
Water estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.It is public by the specific calculating for providing the weight for referring to heat
Formula is conducive to quickly calculate the weight for referring to heat.
On the basis of the various embodiments described above, further, the unit 305 of estimating is specifically used for:
The sum of products of first liquid steel temperature and second liquid steel temperature and corresponding weighted value is calculated, is made
For the real-time liquid steel temperature of the current heat；Wherein, the corresponding weighted value of first liquid steel temperature and second molten steel
The sum of corresponding weighted value of temperature is equal to 1.
Specifically, the product of first liquid steel temperature and corresponding weight of acquisition can be calculated by estimating unit 305, together
When calculate the product of second liquid steel temperature and corresponding weight, then sum to above-mentioned product, using the result of summation as institute
The molten steel for stating current heat estimates temperature.The corresponding weighted value of first liquid steel temperature is corresponding with second liquid steel temperature
The sum of weighted value is equal to 1.
Server provided by the invention, due to that can obtain respectively data calculating by the steel-making information of current converter and obtain
The first liquid steel temperature and the second liquid steel temperature are obtained, the steel of current heat is obtained further according to the first liquid steel temperature and the second liquid steel temperature
Water estimates temperature, reduces BOF Steelmaking Endpoint temperature control cost.The circular of temperature is estimated by providing molten steel,
Be conducive to quickly calculate the weight for referring to heat.
The embodiment of server provided by the invention specifically can be used for executing the process flow of above-mentioned each method embodiment,
Details are not described herein for its function, is referred to the detailed description of above method embodiment.
Server example described above is only schematical, wherein the unit as illustrated by the separation member
It may or may not be physically separated, component shown as a unit may or may not be physics list
Member, it can it is in one place, or may be distributed over multiple network units.It can be selected according to the actual needs
In some or all of the modules achieve the purpose of the solution of this embodiment.Those of ordinary skill in the art are not paying creativeness
Labour in the case where, it can understand and implement.
Through the above description of the embodiments, those skilled in the art can be understood that each embodiment can
It realizes by means of software and necessary general hardware platform, naturally it is also possible to pass through hardware.Based on this understanding, on
Stating technical solution, substantially the part that contributes to existing technology can be embodied in the form of software products in other words, should
Computer software product may be stored in a computer readable storage medium, such as ROM/RAM, magnetic disk, CD, including several fingers
It enables and using so that a computer equipment (can be personal computer, server or the network equipment etc.) executes each implementation
Method described in certain parts of example or embodiment.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (9)
1. a kind of pneumatic steelmaking Study of Temperature Forecasting method characterized by comprising
The steel-making information of current converter is obtained, the steel-making information includes loading data, the data that feed intake, the steel grade letter of current heat
Cease data and furnace gas data；
According to the loading data, the data that feed intake, steel information data and furnace gas data and according to material balance and thermal balance
The theoretical model that principle is established calculates and obtains the first liquid steel temperature；
According to the current heat information of the steel-making acquisition of information of the current converter, and obtain the history heat letter of the first preset quantity
Breath；
According to the history heat information of the current heat information and first preset quantity, calculates and obtain the second molten steel temperature
Degree；
According to first liquid steel temperature and second liquid steel temperature, the molten steel for obtaining the current heat estimates temperature；
Wherein, the history heat information according to the current heat information and first preset quantity obtains the second steel
Coolant-temperature gage includes:
Information is made steel according to the first history of the first current steel-making information and each history heat, calculates separately current heat and every
The difference angle value of a history heat；Wherein, the current heat information includes the described first current steel-making information, the history furnace
Secondary information includes the first history steel-making information, and the described first current steel-making information is corresponding with the first history steel-making information；
According to the calculated result of the difference angle value, the history heat of the smallest second preset quantity of difference angle value is chosen as ginseng
Heat is examined, and each weight with reference to heat is calculated separately according to the difference angle value with reference to heat；
Information is made steel according to the second current steel-making information and each the second history with reference to heat, is calculated separately each with reference to heat
The reference temperature of corresponding current heat；Wherein, the current heat information includes the described second current steel-making information, described to go through
History heat information includes the second history steel-making information, and the described second current steel-making information and second history make steel information
It is corresponding；
According to each reference temperature and corresponding weight with reference to heat with reference to the corresponding current heat of heat,
Calculate second liquid steel temperature.
2. the method according to claim 1, wherein the described first current steel-making information includes:
WtsnCurrent heat weight of molten iron, WfgnCurrent heat steel scrap weight, TempnCurrent heat molten iron temperature, TssinIt is current
Heat molten iron silicon content, TsmnnCurrent heat molten iron manganese content, TspnCurrent heat molten iron phosphorus content；
First history makes steel information
WtsiHistory heat weight of molten iron, WfgiHistory heat steel scrap weight, TempiHistory heat molten iron temperature, TssiiHistory
Heat molten iron silicon content, TsmniHistory heat molten iron manganese content, TspiHistory heat molten iron phosphorus content；
Correspondingly, information is made steel according to first history of the described first current steel-making information and each history heat, respectively
The difference angle value for calculating current heat and each history heat includes:
Si=a* | Wtsn-Wtsi|+b*|Wfgn-Wfgi|+c*|Tempn-Tempi|+d*|Tssin-Tssii|+e*|Tsmnn-Tsmni|+f*|
Tspn-Tspi|
Wherein, SiIndicating the difference angle value of i-th of history heat, i is positive integer and i is less than or equal to first preset quantity, a,
B, c, d, e and f are empirical coefficient.
3. the method according to claim 1, wherein the weight with reference to heat calculates obtain according to the following formula
:
Wherein QiIndicate i-th of weight with reference to heat, SiIndicate i-th of difference with reference to heat
Different angle value, i are positive integer, and n is equal to second preset quantity.
4. method according to claim 1,2 or 3, which is characterized in that described second, which currently makes steel information, includes:
WtsnCurrent heat weight of molten iron, Wfgn-Current heat steel scrap weight, TempnCurrent heat molten iron temperature, TssinIt is current
Heat molten iron silicon content, TsmnnCurrent heat molten iron manganese content, TspnCurrent heat molten iron phosphorus content, WshnCurrent heat stone
Grey weight, WqsnCurrent heat light dolomite weight, WksnCurrent heat ore weight, WsbnCurrent heat dolomite weight
Amount, WshsnCurrent heat lime stone weight, TonCurrent heat oxygen demand, CoconCurrent heat CO and CO2Total amount；
Second history makes steel information
WtsrRefer to heat weight of molten iron, WfgrRefer to heat steel scrap weight, TemprRefer to heat molten iron temperature, TssirReference
Heat molten iron silicon content, TsmnrRefer to heat molten iron manganese content, TsprRefer to heat molten iron phosphorus content, WshrRefer to heat stone
Grey total weight, WqsrRefer to heat light dolomite total weight, WksrRefer to heat ore total weight, WsbrRefer to heat white clouds
Stone total weight, WshsrRefer to heat lime stone total weight, TorRefer to heat one oxygen amount, CocorRefer to heat CO and CO2Always
Amount；
Correspondingly, described that information is made steel according to the described second current steel-making information and each second history, calculate separately each ginseng
The reference temperature for examining the corresponding current heat of heat includes:
Tz=h* (Wtsn-Wtsr)+j*(Wfgn-Wfgr)+k*(Tempn-Tempr)+m*(Tssin-Tssir)+p*(Tsmnn-Tsmnr)+q*
(Tspn-Tspr)+r*(Wshn-Wshr)+s*(Wgsn-Wgsr)+u*(Wksn-Wksr)+v*(Wsbn-Wsbr)+w*(Wshsn-Wshsr)+x*
(Ton-Tor)+y*(Cocon-Cocor)
Wherein, TzIndicate z-th of reference temperature with reference to the corresponding current heat of heat, z is positive integer and z is less than or equal to described
Second preset quantity, h, j, k, m, p, q, r, s, u, v, w, x and y are empirical coefficient.
5. the method according to claim 1, wherein described according to first liquid steel temperature and second steel
Coolant-temperature gage, the molten steel for obtaining the current heat estimate temperature and include:
The sum of products for calculating first liquid steel temperature and second liquid steel temperature and corresponding weighted value, as institute
The molten steel for stating current heat estimates temperature；Wherein, the corresponding weighted value of first liquid steel temperature and second liquid steel temperature
The sum of corresponding weighted value is equal to 1.
6. a kind of server characterized by comprising
First acquisition unit, for obtaining the steel-making information of current converter, the steel-making information includes the loading number of current heat
According to, the data that feed intake, steel information data and furnace gas data；
First computing unit, for according to the loading data, the data that feed intake, steel information data and furnace gas data and according to
The theoretical model that material balance and heat balance principle are established, calculates and obtains the first liquid steel temperature；
Second acquisition unit, for the current heat information of steel-making acquisition of information according to the current converter, and it is pre- to obtain first
If the history heat information of quantity；
Second computing unit, for the history heat information according to the current heat information and first preset quantity, meter
It calculates and obtains the second liquid steel temperature；
Unit is estimated, for according to first liquid steel temperature and second liquid steel temperature, the molten steel for obtaining current heat to be pre-
Estimate temperature.
7. server according to claim 6, which is characterized in that second computing unit includes:
Difference angle value computing unit, for making steel letter according to the first history of the first current steel-making information and each history heat
Breath, calculates separately the difference angle value of current heat Yu each history heat；Wherein, the current heat information includes described first
Current steel-making information, the history heat information include the first history steel-making information, the described first current steel-making information with
It is corresponding that first history makes steel information；
Weight calculation unit chooses the smallest second present count of difference angle value for the calculated result according to the difference angle value
The history heat of amount, which is used as, refers to heat, and calculates separately each power with reference to heat according to the difference angle value with reference to heat
Weight；
Reference temperature computing unit, for making steel letter according to the second current steel-making information and each the second history with reference to heat
Breath, calculates separately each reference temperature with reference to the corresponding current heat of heat；Wherein, the current heat information includes described
Second current steel-making information, the history heat information include the second history steel-making information, the described second current steel-making letter
Breath is corresponding with second history steel-making information；
Second liquid steel temperature computing unit, for according to each reference temperature with reference to the corresponding current heat of heat and
Corresponding weight with reference to heat calculates second liquid steel temperature.
8. server according to claim 7, which is characterized in that the weight calculation unit is specifically used for:
According toEach weight with reference to heat is calculated, wherein QiIndicate i-th of the power with reference to heat
Weight, SiIndicate the difference angle value of i-th of history heat, i is positive integer, and n is equal to the preset quantity.
9. server according to claim 6, which is characterized in that the unit of estimating is specifically used for:
The sum of products for calculating first liquid steel temperature and second liquid steel temperature and corresponding weighted value, as institute
State the real-time liquid steel temperature of current heat；Wherein, the corresponding weighted value of first liquid steel temperature and second liquid steel temperature
The sum of corresponding weighted value is equal to 1.
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| CN109857067B (en) * | 2018-12-23 | 2021-01-05 | 北京首钢自动化信息技术有限公司 | Steelmaking multi-process temperature coordination control system and method under big data environment |
| CN111270029A (en) * | 2020-03-19 | 2020-06-12 | 武钢集团昆明钢铁股份有限公司 | Method for representing molten iron temperature and application thereof |
| CN111334636B (en) * | 2020-03-27 | 2022-04-08 | 宝钢湛江钢铁有限公司 | Converter end point dynamic control method and system based on sublance detection |
| CN112613161B (en) * | 2020-11-30 | 2022-05-03 | 攀钢集团西昌钢钒有限公司 | Heat balance calculation method for semisteel steelmaking and application |
| CN112522474B (en) * | 2020-12-01 | 2022-03-29 | 攀钢集团西昌钢钒有限公司 | Method for controlling LF refining end point temperature |
| CN115074479B (en) * | 2022-05-09 | 2023-12-12 | 包头钢铁（集团）有限责任公司 | Temperature weight calculation method for adding scrap steel into molten steel tank |
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| JP5363238B2 (en) * | 2009-08-11 | 2013-12-11 | 株式会社神戸製鋼所 | Output value prediction method, apparatus, and program for the method |
| JP5482615B2 (en) * | 2010-10-18 | 2014-05-07 | 新日鐵住金株式会社 | Blowing control method in converter |
| CN102965462A (en) * | 2011-09-02 | 2013-03-13 | 鞍钢股份有限公司 | Converter smelting end point automatic control device and control method |
| CN103103309B (en) * | 2013-01-24 | 2014-10-15 | 北京科技大学 | Method of supplementarily forecasting steelmaking finishing point of converter |
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