CN116574865A - LF refining process control method and system - Google Patents
LF refining process control method and system Download PDFInfo
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- CN116574865A CN116574865A CN202310543614.3A CN202310543614A CN116574865A CN 116574865 A CN116574865 A CN 116574865A CN 202310543614 A CN202310543614 A CN 202310543614A CN 116574865 A CN116574865 A CN 116574865A
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- 238000000034 method Methods 0.000 title claims abstract description 87
- 238000007670 refining Methods 0.000 title claims abstract description 83
- 238000004886 process control Methods 0.000 title claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims abstract description 119
- 238000007664 blowing Methods 0.000 claims abstract description 76
- 238000004519 manufacturing process Methods 0.000 claims abstract description 65
- 239000000463 material Substances 0.000 claims abstract description 60
- 239000002893 slag Substances 0.000 claims abstract description 26
- 238000003860 storage Methods 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 9
- 238000004364 calculation method Methods 0.000 claims abstract description 8
- 238000007726 management method Methods 0.000 claims abstract description 7
- 238000012790 confirmation Methods 0.000 claims abstract description 4
- 238000009749 continuous casting Methods 0.000 claims abstract description 4
- 229910000831 Steel Inorganic materials 0.000 claims description 36
- 239000010959 steel Substances 0.000 claims description 36
- 238000005275 alloying Methods 0.000 claims description 33
- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 claims description 31
- 239000011575 calcium Substances 0.000 claims description 31
- 229910052791 calcium Inorganic materials 0.000 claims description 31
- 238000012545 processing Methods 0.000 claims description 18
- 238000006477 desulfuration reaction Methods 0.000 claims description 15
- 230000023556 desulfurization Effects 0.000 claims description 15
- 238000009529 body temperature measurement Methods 0.000 claims description 14
- 238000003756 stirring Methods 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 6
- 238000002844 melting Methods 0.000 claims description 6
- 230000008018 melting Effects 0.000 claims description 6
- 238000010521 absorption reaction Methods 0.000 claims description 5
- 238000012821 model calculation Methods 0.000 claims description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 4
- 229910052760 oxygen Inorganic materials 0.000 claims description 4
- 239000001301 oxygen Substances 0.000 claims description 4
- 239000002245 particle Substances 0.000 claims description 4
- 238000007405 data analysis Methods 0.000 claims description 3
- 238000013499 data model Methods 0.000 claims description 3
- 238000005457 optimization Methods 0.000 claims description 3
- 229910052742 iron Inorganic materials 0.000 claims description 2
- 238000009628 steelmaking Methods 0.000 claims description 2
- 230000002950 deficient Effects 0.000 abstract description 2
- 229910045601 alloy Inorganic materials 0.000 description 12
- 239000000956 alloy Substances 0.000 description 12
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- PWHULOQIROXLJO-UHFFFAOYSA-N Manganese Chemical compound [Mn] PWHULOQIROXLJO-UHFFFAOYSA-N 0.000 description 3
- 229910052799 carbon Inorganic materials 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 229910052748 manganese Inorganic materials 0.000 description 3
- 239000011572 manganese Substances 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 239000011574 phosphorus Substances 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 229910052717 sulfur Inorganic materials 0.000 description 2
- 239000011593 sulfur Substances 0.000 description 2
- 229910000914 Mn alloy Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 229910001080 W alloy Inorganic materials 0.000 description 1
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 125000004122 cyclic group Chemical group 0.000 description 1
- 230000003009 desulfurizing effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- PYLLWONICXJARP-UHFFFAOYSA-N manganese silicon Chemical compound [Si].[Mn] PYLLWONICXJARP-UHFFFAOYSA-N 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000033764 rhythmic process Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0075—Treating in a ladle furnace, e.g. up-/reheating of molten steel within the ladle
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0006—Adding metallic additives
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0056—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 using cored wires
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/072—Treatment with gases
-
- 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
-
- 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
Abstract
The invention discloses an LF refining process control method and system, comprising a furnace number and process parameter confirmation module, a refining process control tracking module, a material information management module, a model data calculation module and a process information storage module; s1: obtaining production scheduling information such as a converter plan, a continuous casting plan and the like; s2: basic information of the ladle to be refined is obtained, wherein the basic information comprises furnace number, weight, slag thickness, target temperature, outbound time and final sample application; s3: acquiring the temperature of a refining production link, adding materials, blowing flow at bottom, heating time and sampling basic information of components; the LF refining process control method and the LF refining process control system greatly improve the refining control level, better meet the production standardization, perfect the process control system of the refining production line, improve the personal work convenience of the production line, greatly reduce the misoperation and the defective rate, and provide powerful support for the informatization system by more accurate production data and product information.
Description
Technical Field
The invention belongs to the technical field of LF refining processing line automation, and particularly relates to a control method and a control system for an LF refining process.
Background
The refining of molten steel is a complex procedure in the metallurgical production link, and the production is influenced by various factors such as the smelting steel grade, the production rhythm, personnel quality and the like. In actual production, on-site operators often roughly operate and control refining production according to personal experience and a small amount of refining production data, so that the production is lack of standardization, the production links are difficult to effectively control, the influence of human factors is large, the working difficulty of the on-site operators is also increased, and finally, the production management and the product quality are greatly influenced. Improving automation and standardization of control of refining processes is currently a major concern.
Therefore, the invention provides a LF refining process control method and system; the production and manufacturing planning system and the site controller are connected, the control of refining processes of different steel grades in various production environments is fully considered, the problem that the production reliability is low due to personal experience operation of operators is solved, and the automation and standardization of production are improved.
Disclosure of Invention
The invention aims to provide an LF refining process control method and an LF refining process control system, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: an LF refining process control system comprises a heat and process parameter confirming module, wherein the heat and process parameter confirming module is used for confirming basic information and process parameters of the heat before refining;
the refining flow control tracking module is used for tracking and displaying the process progress of the working procedure where the current heat is located in one-to-one correspondence with the refining process, processing the received primary feedback signal and giving a primary issuing instruction;
the material information management module is used for recording the information of the material types, the position of the storage bin, the component content, the cooling rate, the absorption rate and the like and carrying out parameter support for model calculation;
the model data calculation module is used for calculating the heating duration of the heat and the material input quantity according to the technological parameters and the material information;
and the process information storage module is used for storing various parameters and process information and providing data for the subsequent data analysis and model optimization.
An LF refining process control method adopts the LF refining process control system; the method comprises the following specific steps: s1: obtaining production scheduling information such as a converter plan, a continuous casting plan and the like;
s2: basic information of the ladle to be refined is obtained, wherein the basic information comprises furnace number, weight, slag thickness, target temperature, outbound time and final sample application;
s3: acquiring the temperature of a refining production link, adding materials, blowing flow at bottom, heating time and sampling basic information of components;
s4: tracking and controlling a production flow, receiving and processing a primary trigger feedback signal of each stage of LF refining, and giving a primary issuing instruction;
s5: calculating a temperature model, namely calculating heating time length and predicted temperature change by using the temperature model according to the existing information, and calculating temperature compensation time after feeding;
s6: calculating a component model, namely calculating the lowest feeding cost under the condition that the molten steel components are matched according to the slag thickness, sampling components and material parameters;
s7: and (3) configuration management of parameters such as material component ratio, absorption rate, cooling rate and the like.
Preferably, the LF refining process control is divided into nine stages, respectively: the method comprises an initial stage, an auxiliary material input stage, a slag melting stage, a desulfurization stage, a heating stage, an alloying stage, a calcium treatment stage, a soft blowing stage and a treatment position leaving stage.
Preferably, the initial stage: firstly, conveying molten iron components in a laboratory, calculating a secondary model according to the molten steel components and the target molten steel components, and calculating charging data and hand charging data of a corresponding bin; the operator confirms the furnace number to be produced and waits for a signal sent to the processing position at one stage; after the second stage receives the processing position signal, an operator confirms the refining start, marks the automatic steel making to be formally started, the second stage sends a refining start command to the first stage, the first stage immediately returns to the refining start state after receiving the refining start command, the second stage tracking program sends configuration data of the second stage (auxiliary material input stage) to the first stage after receiving the refining start command, and simultaneously sets a stage mark to be 2 and sends the configuration data to the first stage; the configuration data includes: the shell breaking time, the bottom blowing flow, the bottom blowing default flow and the weight of aluminum particles.
Preferably, firstly, the first stage actually transmits a shell breaking start signal according to production, the shell breaking time is executed according to the configuration time of the second stage transmission, and a shell breaking end signal is transmitted after the completion; and then the first stage sends an auxiliary material input starting signal according to actual production, the storage bin starts to input materials according to the material input data calculated by the model, and after the auxiliary material input step is finished, an auxiliary material input ending signal is sent.
Preferably, the slagging stage comprises a heating process step; before heating starts, a stage sends a temperature measurement value and a temperature measurement end state signal according to actual production, a tracking program judges at the moment, if the shell breaking is ended and the auxiliary material input is not ended, a stage mark is set to 23 and sent to the stage; if the shell breaking is finished and the auxiliary material input is finished, setting a stage mark to be 3 and sending the stage mark to a first stage; at the moment, after the second stage receives the actually measured temperature, judging whether the actually measured value is more than 1000 and is more than 1000 as an effective value, transmitting the actually measured effective temperature to a model program, calculating heating time by the model program, transmitting the calculated heating time and heating gear to a tracking system after the calculation is completed, and transmitting the heating time and the heating gear calculated by the model to a first stage through configuration data and displaying the heating time and the heating gear on a picture by the tracking system; and then sending configuration data of a third stage (slag melting stage) to the first stage, wherein the configuration data comprises: heating the gear, heating time, process target temperature, bottom blowing flow rate and bottom blowing default flow rate; before heating starts, the first stage sends a second and third refined electrode state signal, and the tracking program receives but does not process the signal; after the first-stage judgment that the heating start conditions are all met, heating is started, and a heating start state signal is sent to the tracking; after the actual heating of the production is finished, a heating finishing state signal is sent to the tracking; after heating is finished, the second stage sends configuration data of a fourth stage (desulfurization stage) to the first stage, and simultaneously sets a stage mark to be 4 and sends the configuration data to the first stage; the configuration data includes: desulfurization time, bottom blowing flow, bottom blowing default flow and aluminum particle weight.
Preferably, the first stage transmits a desulfurization start signal according to actual production, and transmits a desulfurization end signal after the desulfurization stirring step is completed; the secondary tracking program receives each status signal and stores the relevant information.
Preferably, the heating stage comprises a heating process step, wherein the heating stage is a circulating process, the temperature is detected firstly, heating is carried out when the temperature is not satisfied, and eight circulating heating times are set at most according to a production demand tracking program; firstly, a first stage sends a temperature measurement value and a temperature measurement completion state signal according to actual production, a tracking program receives the temperature measurement value and then transmits the measured temperature to a model program, the model program calculates heating time and sends the calculated heating time and heating gear to the tracking program, and the tracking program sends the heating time and the heating gear calculated by the model to the first stage through configuration data; when the heating time calculated by the model is less than 60 seconds, the temperature accords with the heating time, and the heating stage is finished; when the heating time is longer than 60 seconds, the temperature is not consistent, a heating step is carried out, and a new heating cycle is started; the tracking program only stores the first heating value received in each heating cycle; after the tracking program receives the temperature measurement completion status signal and determines that the temperature is not consistent, judging whether an alloying stage is in progress, if so, setting a stage mark as 56 and transmitting the stage mark to a first stage; if the alloying phase has ended, setting the phase flag to 5 and sending to the first stage; simultaneously sending configuration data of a fifth stage (heating stage) to the first stage; the configuration data includes: heating gear, heating time, end point target temperature, bottom blowing flow, bottom blowing default flow, stirring time and stirring flow; the first stage is to send sampling completion state signals, oxygen value and oxygen completion state signals, second and third refining electrode state signals according to actual production, and tracking programs do not process; after the first-stage judgment that the heating start conditions are all met, heating is started, and a heating start state signal is sent to the tracking; after the actual heating of the production is finished, a heating finishing state signal is sent to the tracking; at this time, one heating cycle is formally ended; when the temperatures are consistent, the tracking program judges whether the components are consistent; if yes, judging whether the length of the calcium line in the seventh stage is zero, and if not, sending configuration data of the seventh stage (calcium processing stage) to the first stage, setting a stage mark to 7 and sending the configuration data to the first stage, wherein the configuration data comprises: the length of the calcium line, the bottom blowing flow and the bottom blowing default flow; if the length of the calcium line is zero, sending configuration data of an eighth stage (soft blowing stage) to the first stage, setting a stage mark to 8 and sending the stage mark to the first stage; the configuration data includes: soft blowing time, bottom blowing flow, bottom blowing default flow.
Preferably, the alloying stage comprises an alloying process step, wherein the alloying stage is a cyclic process, firstly judging whether components are in accordance or not, and performing alloying treatment if the components are not in accordance, wherein the alloying treatment is given for eight times at most according to a production demand tracking program; firstly, the tracking program receives the component arrival state from the model program and judges whether the components accord with each other or not; the components conform to each other, and the alloying stage is finished; the components are not matched, and the process enters an alloying step to start a new alloying cycle; after the tracking program receives the component arrival state and determines that the components are not in conformity, judging whether a heating stage is in progress, if so, setting a stage mark as 56 and transmitting the stage mark to a first stage; if the temperature raising stage is finished, setting a stage mark to be 6 and sending the stage mark to the first stage; simultaneously transmitting configuration data of a sixth stage (alloying stage) to the first stage; the configuration data includes: bottom blowing flow, bottom blowing default flow, wire feeding length and wire feeding type; the wire feeding length and the wire feeding type are calculated by a model program; the first stage sends an alloying start state signal according to actual production, and alloying starts; the first stage sends a blanking completion state signal and an alloying end state signal according to production practice; at this time, one alloying cycle formally ends; when the components are consistent, the tracking program judges whether the temperatures are consistent; if yes, judging whether the length of the calcium line in the seventh stage is zero, and if not, sending configuration data of the seventh stage (calcium processing stage) to the first stage, setting a stage mark to 7 and sending the configuration data to the first stage, wherein the configuration data comprises: the length of the calcium line, the bottom blowing flow and the bottom blowing default flow; if the length of the calcium line is zero, sending configuration data of an eighth stage (soft blowing stage) to the first stage, setting a stage mark to 8 and sending the stage mark to the first stage; the configuration data includes: soft blowing time, bottom blowing flow, bottom blowing default flow.
Preferably, the calcium treatment stage comprises a calcium treatment process step; firstly, a first stage of transmitting a calcium treatment starting signal according to actual production, and transmitting a calcium treatment ending signal after the calcium treatment step is finished; transmitting configuration data of an eighth stage (soft blowing stage) to the first stage, and simultaneously setting a stage flag to 8 and transmitting the stage flag to the first stage; the configuration data includes: soft blowing time, bottom blowing flow, bottom blowing default flow;
the soft blowing stage comprises soft blowing process steps; firstly, a first stage of soft blowing start signals are sent according to actual production, and soft blowing end signals are sent after the soft blowing step is finished;
leaving the processing bit stage: the first stage firstly transmits a signal leaving the processing bit, judges whether the soft blowing flow is 0 after 30 seconds, and transmits a refining end signal if the soft blowing flow is 0, so that the refining is ended.
Compared with the prior art, the invention has the beneficial effects that: the LF refining process control method and the LF refining process control system greatly improve the refining control level, better meet the production standardization, perfect the process control system of the refining production line, improve the personal work convenience of the production line, greatly reduce the misoperation and the defective rate, and provide powerful support for the informatization system by more accurate production data and product information.
Drawings
FIG. 1 is a flow chart of LF refining process control in accordance with an embodiment of the invention;
FIG. 2 is a graph showing the relationship between slag return and auxiliary material addition in the first embodiment of the invention;
FIG. 3 is a component model calculation flow diagram in accordance with an embodiment of the present invention;
FIG. 4 is a block diagram of a second LF refining system in accordance with embodiments of the invention;
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
A LF refining control method and system comprises the following steps: according to the production process, the LF refining is divided into nine stages, namely: the method comprises an initial stage, an auxiliary material input stage, a slag melting stage, a desulfurization stage, a heating stage, an alloying stage, a calcium treatment stage, a soft blowing stage and a treatment position leaving stage. In the initial stage, operators confirm the furnace number to be refined, the weight of molten steel, the slag thickness, the target temperature and the outlet time after refining is finished, and when the steel ladle enters a treatment position, the material bin is used for batching, and auxiliary materials calculated in advance are added into the hopper.
Example 1
As shown in fig. 1, the present invention provides a method for controlling an LF refining process, including:
s1, acquiring an LF refining plan and technological parameters of molten steel to be LF refined, and calculating the addition amount of auxiliary materials and preparing materials in advance when the current heat confirms the start of refining after the other heat leaves a treatment position;
s2, determining that the heat to be refined reaches a treatment position, carrying out shell breaking treatment on molten steel, and then adding calculated auxiliary materials;
s3, after the material feeding is finished, carrying out temperature measurement operation. Determining the target temperature of the process according to the temperature measurement data, the adding amount of auxiliary materials and the outbound time, and calculating the heating time. If the refining electrodes are not added at the same time, the descending electrode carries out heating treatment on the molten steel;
s4, optionally, after the heating is determined to be finished, adding a desulfurizing agent and stirring molten steel;
s5, determining that stirring is finished, measuring the temperature of molten steel, sampling, calculating heating time by a temperature model, confirming the electrode state of each station, and lowering the electrode for heating after meeting the requirements;
s6, after the components are determined to be reached, calculating the feeding amount by the component model;
s7, optionally, determining that the temperature components are in accordance, and if the temperature components are in accordance with the wire feeding conditions, starting a wire feeder to feed a calcium wire;
s8, determining that the temperature components accord with or the calcium treatment is finished, and performing soft blowing treatment according to a default setting;
s9, after the soft blowing is finished, the ladle leaves the processing position.
In S1, the molten steel process parameters comprise converter end point sample components, slag thickness and weight; the refining plan comprises the number of the furnace to be refined, the steel grade information, the continuous casting drawing speed and the water content of the tundish.
In S2, the input amount of auxiliary materials is related to the slag returning and the initial sulfur content, and the slag returning is divided into slag returning with large slag returning amount, slag returning with small slag returning amount and no slag returning amount. Different slag returning conditions correspond to different auxiliary material addition amounts. The correspondence is shown in fig. 2.
In S3, S5, determining a process target temperature or an end point target temperature according to the predicted refining time, and calculating the heating time from the heating power, the molten steel amount, the auxiliary materials and the alloy input amount. Delta T Heating up ＝T 0 -T 1 +ΔT 2 +ΔT 3 +ΔT 4 +ΔT 5 Wherein T is 0 For the process target temperature or the end point target temperature, T 1 For initial molten steel temperature, deltaT 2 For the change of alloy feeding temperature drop, delta T 3 For ladle heat radiation, deltaT 4 Delta T is the change of heating temperature of the electrode 5 Is the temperature drop caused by argon blowing.
Alloy charge and temperature loss relationship:
ΔT＝Σ i ((W i /W m )*C ci,m *100)
wherein, Δt: lowering the temperature (. Degree.C.), W i : weight of material (kg), W m : weight of molten steel (kg), C ci,m : material cooling degree (. Degree.C./%).
Temperature loss change relation by argon blowing:
ΔQ＝C air flow *W Air flow *(T Liquid and its preparation method -T Air flow )
ΔT＝-ΔQ/(W Steel and method for producing same *C Steel and method for producing same )
Wherein Δq: gas heat loss (J), Δt: temperature loss (. Degree. C.) C Air flow : specific heat capacity of gas (J/(kg x deg.c)),
W air flow : weight of supplied air (kg), T Liquid and its preparation method : temperature of molten steel (DEG C), T Air flow : gas temperature (. Degree. C.), W Steel and method for producing same : weight of steel (kg), C Steel and method for producing same : specific heat capacity of steel (J/(kg x ℃)).
Temperature change relation by electrode heating:
ΔT ht_i ＝(E i *E eff_i *t i /W steel and method for producing same C Steel and method for producing same )*3600*1000
Wherein DeltaT ht_i : temperature rise of single electrode heating is changed with time (DEG C) under class i, E i : power supply speed (Kwh/min) at heating level i, E eff_i : heating efficiency (%), t at heating level i i : heating time (min) at heating level i.
Temperature drop by heat radiation relationship:
ΔT＝((A t -A n εσ(T slag 4- T srd 4 )+A n εσ(T m 4 -T srd 4 ))/(W m *C p,m ))*t
wherein A is t : surface area of molten steel and steel slag (m 2 )，A n Surface area of top bare steel (m 2 )，T slag : steel slag temperature (°c), epsilon: coefficient of thermal radiation, σ: stefan-Boltzmann constant.
In S6, the material addition amount is calculated according to parameters such as molten steel weight, sampling components, furnace burden yield, furnace burden cost and the like. And the cost is optimized, so that the input materials meet the components and the material cost is reduced as much as possible.
The addition amount of the alloy in the alloying stage is specifically as follows:
W alloy ＝ΔC*W Molten steel /α f *f
Wherein W is Alloy : alloy weight (kg), Δc: also required is the percentage (%) of an element, W Molten steel : molten steel weight (kg), f: average yield (%), alpha of certain element in the material f : the content of an element in the alloy.
Specifically, the material calculation input quantity adopts an alloy addition coefficient method. When calculating the addition amount of various alloys, the following priority principles should be followed when selecting the type and amount of the additional alloy: the alloy with high carbon content and low price is selected preferentially, but the limit elements such as phosphorus, sulfur, carbon and the like in the added molten steel are ensured not to exceed the standard, otherwise, the alloy with low phosphorus, low carbon and the like is selected; when the silicon-manganese alloy is needed to adjust the silicon and manganese contents of molten steel, firstly, the manganese content in the steel is ensured to be within a required range, and the manganese returning amount is controlled. The component model calculation flow is shown in fig. 3.
Example two
The technical scheme of the invention also provides an LF refining process control system, which comprises the following steps:
as shown in fig. 4, the LF refining process control system is composed of an LF refining primary heat and process parameter confirmation module, a refining process control tracking module, a material information maintenance module, a model data calculation module, and a process information storage module.
And the furnace number and process parameter confirmation module confirms basic information and process parameters of the furnace number before refining.
And the refining flow control tracking module is in one-to-one correspondence with the refining process, tracks and displays the process of the current heat, processes the received primary feedback signal and gives a primary issuing instruction.
And the material information management module is used for recording the information such as the material types, the position of the storage bin, the component content, the cooling rate, the absorption rate and the like and carrying out parameter support for model calculation.
And the model data calculation module is used for calculating the heating duration of the heat and the material input quantity according to the technological parameters and the material information.
And the process information storage module is used for storing various parameters and process information and providing a data source for the subsequent data analysis and model optimization.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (10)
1. An LF refining process control system, characterized by: the furnace number and process parameter confirmation module is used for confirming basic information and process parameters of the furnace number before refining;
the refining flow control tracking module is used for tracking and displaying the process progress of the working procedure where the current heat is located in one-to-one correspondence with the refining process, processing the received primary feedback signal and giving a primary issuing instruction;
the material information management module is used for recording the information of the material types, the position of the storage bin, the component content, the cooling rate, the absorption rate and the like and carrying out parameter support for model calculation;
the model data calculation module is used for calculating the heating duration of the heat and the material input quantity according to the technological parameters and the material information;
and the process information storage module is used for storing various parameters and process information and providing data for the subsequent data analysis and model optimization.
2. An LF refining process control method is characterized in that: use of the LF refining process control system of claim 1; the method comprises the following specific steps: s1: obtaining production scheduling information such as a converter plan, a continuous casting plan and the like;
s2: basic information of the ladle to be refined is obtained, wherein the basic information comprises furnace number, weight, slag thickness, target temperature, outbound time and final sample application;
s3: acquiring the temperature of a refining production link, adding materials, blowing flow at bottom, heating time and sampling basic information of components;
s4: tracking and controlling a production flow, receiving and processing a primary trigger feedback signal of each stage of LF refining, and giving a primary issuing instruction;
s5: calculating a temperature model, namely calculating heating time length and predicted temperature change by using the temperature model according to the existing information, and calculating temperature compensation time after feeding;
s6: calculating a component model, namely calculating the lowest feeding cost under the condition that the molten steel components are matched according to the slag thickness, sampling components and material parameters;
s7: and (3) configuration management of parameters such as material component ratio, absorption rate, cooling rate and the like.
3. The LF refining process control method of claim 2 wherein: the LF refining process is controlled into nine stages, namely: the method comprises an initial stage, an auxiliary material input stage, a slag melting stage, a desulfurization stage, a heating stage, an alloying stage, a calcium treatment stage, a soft blowing stage and a treatment position leaving stage.
4. A LF refining process control method according to claim 3, characterized in that: the initial stage is as follows: firstly, conveying molten iron components in a laboratory, calculating a secondary model according to the molten steel components and the target molten steel components, and calculating charging data and hand charging data of a corresponding bin; the operator confirms the furnace number to be produced and waits for a signal sent to the processing position at one stage; after the second stage receives the processing position signal, an operator confirms the refining start, marks the automatic steel making to be formally started, the second stage sends a refining start command to the first stage, the first stage immediately returns to the refining start state after receiving the refining start command, the second stage tracking program sends configuration data of the second stage (auxiliary material input stage) to the first stage after receiving the refining start command, and simultaneously sets a stage mark to be 2 and sends the configuration data to the first stage; the configuration data includes: the shell breaking time, the bottom blowing flow, the bottom blowing default flow and the weight of aluminum particles.
5. A method and system for controlling an LF refining process according to claim 3, wherein: the auxiliary material input stage comprises two process steps of shell breaking and auxiliary material input; firstly, a first stage sends a shell breaking start signal according to actual production, the shell breaking time is executed according to the configuration time of second stage sending, and a shell breaking end signal is sent after the completion; and then the first stage sends an auxiliary material input starting signal according to actual production, the storage bin starts to input materials according to the material input data calculated by the model, and after the auxiliary material input step is finished, an auxiliary material input ending signal is sent.
6. A method and system for controlling an LF refining process according to claim 3, wherein: the slag melting stage comprises a heating process step; before heating starts, a stage sends a temperature measurement value and a temperature measurement end state signal according to actual production, a tracking program judges at the moment, if the shell breaking is ended and the auxiliary material input is not ended, a stage mark is set to 23 and sent to the stage; if the shell breaking is finished and the auxiliary material input is finished, setting a stage mark to be 3 and sending the stage mark to a first stage; at the moment, after the second stage receives the actually measured temperature, judging whether the actually measured value is more than 1000 and is more than 1000 as an effective value, transmitting the actually measured effective temperature to a model program, calculating heating time by the model program, transmitting the calculated heating time and heating gear to a tracking system after the calculation is completed, and transmitting the heating time and the heating gear calculated by the model to a first stage through configuration data and displaying the heating time and the heating gear on a picture by the tracking system; and then sending configuration data of a third stage (slag melting stage) to the first stage, wherein the configuration data comprises: heating the gear, heating time, process target temperature, bottom blowing flow rate and bottom blowing default flow rate; before heating starts, the first stage sends a second and third refined electrode state signal, and the tracking program receives but does not process the signal; after the first-stage judgment that the heating start conditions are all met, heating is started, and a heating start state signal is sent to the tracking; after the actual heating of the production is finished, a heating finishing state signal is sent to the tracking; after heating is finished, the second stage sends configuration data of a fourth stage (desulfurization stage) to the first stage, and simultaneously sets a stage mark to be 4 and sends the configuration data to the first stage; the configuration data includes: desulfurization time, bottom blowing flow, bottom blowing default flow and aluminum particle weight.
7. A method and system for controlling an LF refining process according to claim 3, wherein: the desulfurization stage comprises the steps of desulfurization stirring; the first stage sends a desulfurization start signal according to actual production, and sends a desulfurization end signal after the desulfurization stirring step is completed; the secondary tracking program receives each status signal and stores the relevant information.
8. A method and system for controlling an LF refining process according to claim 3, wherein: the heating stage comprises a heating process step, wherein the heating stage is a circulating process, the temperature is firstly detected, heating is carried out when the temperature is not satisfied, and the maximum of eight times of circulating heating is given according to a production demand tracking program; firstly, a first stage sends a temperature measurement value and a temperature measurement completion state signal according to actual production, a tracking program receives the temperature measurement value and then transmits the measured temperature to a model program, the model program calculates heating time and sends the calculated heating time and heating gear to the tracking program, and the tracking program sends the heating time and the heating gear calculated by the model to the first stage through configuration data; when the heating time calculated by the model is less than 60 seconds, the temperature accords with the heating time, and the heating stage is finished; when the heating time is longer than 60 seconds, the temperature is not consistent, a heating step is carried out, and a new heating cycle is started; the tracking program only stores the first heating value received in each heating cycle; after the tracking program receives the temperature measurement completion status signal and determines that the temperature is not consistent, judging whether an alloying stage is in progress, if so, setting a stage mark as 56 and transmitting the stage mark to a first stage; if the alloying phase has ended, setting the phase flag to 5 and sending to the first stage; simultaneously sending configuration data of a fifth stage (heating stage) to the first stage; the configuration data includes: heating gear, heating time, end point target temperature, bottom blowing flow, bottom blowing default flow, stirring time and stirring flow; the first stage is to send sampling completion state signals, oxygen value and oxygen completion state signals, second and third refining electrode state signals according to actual production, and tracking programs do not process; after the first-stage judgment that the heating start conditions are all met, heating is started, and a heating start state signal is sent to the tracking; after the actual heating of the production is finished, a heating finishing state signal is sent to the tracking; at this time, one heating cycle is formally ended; when the temperatures are consistent, the tracking program judges whether the components are consistent; if yes, judging whether the length of the calcium line in the seventh stage is zero, and if not, sending configuration data of the seventh stage (calcium processing stage) to the first stage, setting a stage mark to 7 and sending the configuration data to the first stage, wherein the configuration data comprises: the length of the calcium line, the bottom blowing flow and the bottom blowing default flow; if the length of the calcium line is zero, sending configuration data of an eighth stage (soft blowing stage) to the first stage, setting a stage mark to 8 and sending the stage mark to the first stage; the configuration data includes: soft blowing time, bottom blowing flow, bottom blowing default flow.
9. A method and system for controlling an LF refining process according to claim 3, wherein: the alloying stage comprises alloying process steps, the stage is a circulating process, firstly, whether components are in accordance or not is judged, the components are not in accordance, alloying treatment is carried out, and the maximum eight times of circulating alloying treatment are given according to a production demand tracking program; firstly, the tracking program receives the component arrival state from the model program and judges whether the components accord with each other or not; the components conform to each other, and the alloying stage is finished; the components are not matched, and the process enters an alloying step to start a new alloying cycle; after the tracking program receives the component arrival state and determines that the components are not in conformity, judging whether a heating stage is in progress, if so, setting a stage mark as 56 and transmitting the stage mark to a first stage; if the temperature raising stage is finished, setting a stage mark to be 6 and sending the stage mark to the first stage; simultaneously transmitting configuration data of a sixth stage (alloying stage) to the first stage; the configuration data includes: bottom blowing flow, bottom blowing default flow, wire feeding length and wire feeding type; the wire feeding length and the wire feeding type are calculated by a model program; the first stage sends an alloying start state signal according to actual production, and alloying starts; the first stage sends a blanking completion state signal and an alloying end state signal according to production practice; at this time, one alloying cycle formally ends; when the components are consistent, the tracking program judges whether the temperatures are consistent; if yes, judging whether the length of the calcium line in the seventh stage is zero, and if not, sending configuration data of the seventh stage (calcium processing stage) to the first stage, setting a stage mark to 7 and sending the configuration data to the first stage, wherein the configuration data comprises: the length of the calcium line, the bottom blowing flow and the bottom blowing default flow; if the length of the calcium line is zero, sending configuration data of an eighth stage (soft blowing stage) to the first stage, setting a stage mark to 8 and sending the stage mark to the first stage; the configuration data includes: soft blowing time, bottom blowing flow, bottom blowing default flow.
10. A method and system for controlling an LF refining process according to claim 3, wherein: the calcium treatment stage comprises the steps of a calcium treatment process; firstly, a first stage of transmitting a calcium treatment starting signal according to actual production, and transmitting a calcium treatment ending signal after the calcium treatment step is finished; transmitting configuration data of an eighth stage (soft blowing stage) to the first stage, and simultaneously setting a stage flag to 8 and transmitting the stage flag to the first stage; the configuration data includes: soft blowing time, bottom blowing flow, bottom blowing default flow;
the soft blowing stage comprises soft blowing process steps; firstly, a first stage of soft blowing start signals are sent according to actual production, and soft blowing end signals are sent after the soft blowing step is finished;
leaving the processing bit stage: the first stage firstly transmits a signal leaving the processing bit, judges whether the soft blowing flow is 0 after 30 seconds, and transmits a refining end signal if the soft blowing flow is 0, so that the refining is ended.
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