CN114381573B - Control method, device, equipment and medium for electrode in ladle refining furnace - Google Patents
Control method, device, equipment and medium for electrode in ladle refining furnace Download PDFInfo
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- CN114381573B CN114381573B CN202111628282.6A CN202111628282A CN114381573B CN 114381573 B CN114381573 B CN 114381573B CN 202111628282 A CN202111628282 A CN 202111628282A CN 114381573 B CN114381573 B CN 114381573B
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Abstract
The invention discloses a control method, a device, equipment and a medium of an electrode in a ladle refining furnace, wherein the refining furnace comprises a double-station heating system, and the method comprises the following steps: if the working stage of the first station is monitored to be in the heating stage and the electrode is positioned on the first station, determining the first heating time of the electrode, and sending the determined first heating time to a heating system, so that the heating system controls the first station to heat the electrode according to the first heating time; acquiring the temperature of the electrode after heating; and determining the second heating time of the electrode based on the temperature, and sending the second heating time to the heating system so that the heating system controls the first station to heat the electrode according to the second heating time. The method can realize the accurate control of the electrode heating time in the LF smelting process, thereby effectively improving the automation level of the smelting process of the refining furnace.
Description
Technical Field
The invention relates to the technical field of smelting, in particular to a control method, a device, equipment and a medium for an electrode in a ladle refining furnace.
Background
The ladle refining (LadleFurnace, LF) furnace has simple equipment, low investment cost, flexible operation and good refining effect, and becomes a late-stage part of the metallurgical industry. LF refining mainly relies on white slag in a barrel, argon is blown into the barrel in a low-oxygen atmosphere (the oxygen content is 5 percent) to stir, and graphite electrodes heat molten steel passing through a primary refining furnace to refine. As the argon stirring accelerates the chemical reaction between slag and steel, and the electric arc heating is used for temperature compensation, the longer refining time can be ensured, so that the oxygen and sulfur contents in the steel can be reduced, and the inclusion is rated as 0-0.1 according to ASTM. The steel grade processed by the LF furnace almost relates to all steel grades from special steel to common steel, and different process operation systems are adopted according to the requirement of quality control in production. In various secondary refining devices, the LF furnace has high comprehensive cost performance.
In the steel smelting process, an LF furnace is a key process for producing high-quality steel. However, due to different requirements of clients on steel types and imperfect process systems, the conventional process for treating common steel by an LF furnace in the prior art has long process time, so that the consumption of electricity, auxiliary materials and refractory materials is large, the production cost is increased, and the economic benefit of steel manufacturers is reduced.
Disclosure of Invention
The embodiment of the application provides a control method, a device, equipment and a medium for an electrode in a ladle refining furnace, and the method can realize the accurate control of the electrode heating time in the smelting process of the ladle refining furnace, so that the automation level of the smelting process of the refining furnace is effectively improved.
In a first aspect, the present invention provides, according to an embodiment of the present invention, the following technical solutions:
a control method of an electrode in a ladle refining furnace, characterized in that the refining furnace comprises a double-station heating system, the double-station heating system comprises a heating system, a first station and a second station, the heating system, the first station and the second station are mutually connected, the first station and the second station are used for heating the electrode under the control of the heating system, and the method comprises the following steps: if the working stage of the first station is monitored to be in a heating stage and the electrode is positioned on the first station, determining the first heating time of the electrode, and sending the determined first heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the first heating time; acquiring the temperature of the electrode after heating; and determining a second heating time of the electrode based on the temperature, and sending the second heating time to the heating system so that the heating system controls the first station to heat the electrode according to the second heating time.
Preferably, if the first station is a heating stage and the electrode is on the second station, whether the current working stage of the second station is in the heating stage is monitored, and if not, the electrode is controlled to be switched to the first station.
Preferably, the working phase further comprises: and if the current working phase of the second station is a heating phase, monitoring the current working phase of the second station every preset time period until the second station is the waiting phase, the pre-heating phase or the post-heating phase, and controlling the electrode to be switched to the first station.
Preferably, said determining the first heating time of said electrode comprises: the first heating time of the electrode is determined based on the temperature of the steel grade as it enters the casting machine, the temperature of the molten steel, the predicted temperature drop in the production of the steel grade, the preset temperature correction value, and the preset heating rate of the electrode.
Preferably, the predicted temperature drop in the steel grade production includes a predicted temperature drop caused by adding an alloy into the steel grade, a predicted temperature drop caused by adding a slag charge into the steel grade, and a temperature drop in an argon blowing or hoisting process of molten steel, wherein the acquiring of the temperature drop in the argon blowing or hoisting process of the molten steel includes: determining the residual pouring time of the current large ladle of the casting machine based on the residual molten steel amount of the large ladle of the casting machine, the drawing speed of the casting machine, the sectional area of a casting blank and the density of molten steel; and determining the temperature drop of the molten steel in the argon blowing or hoisting process based on the residual pouring time, the preset steel ladle hoisting time, the preset temperature drop rate in the argon blowing process of the steel ladle and the preset temperature drop rate in the steel ladle hoisting process.
Preferably, the obtaining of the molten steel temperature includes: and determining the temperature of the molten steel based on the temperature measurement result of the molten steel, the time of the current heating system, the temperature measurement time of the molten steel and the preset temperature drop rate in the argon blowing process of the steel ladle.
Preferably, said determining a second heating time of said electrode based on said temperature comprises: and determining the second heating time of the electrode based on the temperature of the steel grade when entering the casting machine, the current temperature of the molten steel, the expected temperature drop in steel grade production and the preset heating rate of the electrode.
In a second aspect, the present invention provides, according to an embodiment of the present invention, the following technical solutions:
a control device for an electrode in a ladle refining furnace, comprising:
the first time determining module is used for determining first heating time of the electrode if the working stage of the first station is in a heating stage and the electrode is on the first station, and sending the determined first heating time to the heating system so that the heating system controls the first station to heat the electrode according to the first heating time;
the temperature acquisition module is used for acquiring the temperature of the electrode after heating is completed;
and the second time determining module is used for determining the second heating time of the electrode based on the temperature and sending the second heating time to the heating system so that the heating system controls the first station to heat the electrode according to the second heating time.
In a third aspect, the present invention provides, according to an embodiment of the present invention, the following technical solutions:
an electronic device, comprising: a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of the first aspect described above when the program is executed.
One or more technical solutions provided in the embodiments of the present application at least have the following technical effects or advantages:
the embodiment of the invention provides a control method, a device, equipment and a medium for an electrode in a ladle refining furnace, wherein the method comprises the following steps: and determining whether the first station is a heating stage or not by monitoring the current working stage of the first station, if so, determining the first heating time of the electrode and sending the determined first heating time to a heating system, so that the heating system controls the first station to heat the electrode according to the first heating time. And then, acquiring the temperature of the electrode after heating, determining the second heating time of the electrode based on the temperature, and sending the second heating time to a heating system so that the heating system controls the first station to heat the electrode according to the second heating time. According to the method, when the first station is determined to be in the heating stage and the electrode is positioned on the first station, the first heating time of the electrode is calculated, the temperature after the electrode is heated is obtained, and the second heating time of the electrode is determined based on the heating temperature, so that after the first heating time of the electrode of the furnace refining furnace is determined, the second heating time of the electrode of the furnace refining furnace is determined after the slag charge addition, the alloy addition and the first heating are determined. The method can realize the accurate control of the electrode heating time in the LF smelting process, thereby effectively improving the automation level of the smelting process of the refining furnace, further improving the production stability and reducing the labor intensity of field operators.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a control method of an electrode in a ladle refining furnace provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of automatic control for duplex phase switching according to an embodiment of the present invention;
fig. 3 is a schematic structural view of a control device for an electrode in a ladle refining furnace according to an embodiment of the present invention;
fig. 4 is a schematic structural diagram of an electronic device according to an embodiment of the present invention.
Detailed Description
According to the embodiment of the application, the control method, the device, the equipment and the medium of the electrode in the ladle refining furnace are provided, and the method can realize the accurate control of the electrode heating time in the LF smelting process, so that the automation level of the refining furnace smelting process is effectively improved.
The technical scheme of the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
a control method of an electrode in a ladle refining furnace, characterized in that the refining furnace comprises a double-station heating system, the double-station heating system comprises a heating system, a first station and a second station, the heating system, the first station and the second station are mutually connected, the first station and the second station are used for heating the electrode under the control of the heating system, and the method comprises the following steps: if the working stage of the first station is monitored to be in a heating stage and the electrode is positioned on the first station, determining the first heating time of the electrode, and sending the determined first heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the first heating time; acquiring the temperature of the electrode after heating; and determining a second heating time of the electrode based on the temperature, and sending the second heating time to the heating system so that the heating system controls the first station to heat the electrode according to the second heating time.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
The main execution body of the control method of the electrode in the ladle refining furnace in the application can be a secondary model or an upper computer, and the concrete embodiment of the application takes the secondary model as an example to describe the control method of the electrode in the ladle refining furnace in detail.
In a first aspect, an embodiment of the present invention provides a method for controlling an electrode in a ladle refining furnace, where the refining furnace includes a dual-station heating system, the dual-station heating system includes a heating system (primary system), a first station, and a second station, the heating system, the first station, and the second station are connected to each other, and the first station and the second station are configured to heat the electrode under control of the heating system, specifically, as shown in fig. 1, the method includes the following steps S101 to S103.
Step S101, if the working stage of the first station is in the heating stage and the electrode is on the first station, determining the first heating time of the electrode, and sending the determined first heating time to a heating system, so that the heating system controls the first station to heat the electrode according to the first heating time;
step S102, acquiring the temperature of the electrode after heating;
step S103, determining second heating time of the electrode based on the temperature, and sending the second heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the second heating time.
In a specific implementation process, before monitoring the working stage in which the first station is currently located, the method may include: based on a preset dividing rule, the LF smelting process is divided into four stages, namely four stages shown in fig. 2, namely a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, and the second-stage model automatically judges the current stage of the first station and the second station of the LF furnace.
Specifically, the preset dividing rule may be: the waiting stage division rule is that the steel ladle at the current station is not positioned at a processing position; the stage division rule before heating is that the current station is not subjected to temperature measurement and the steel ladle is positioned at a treatment position; the heating stage division rule is that the current station has at least one temperature measurement, the heat is not completed for two times, and the steel ladle is positioned at the treatment position; the stage division rule after heating is that the current station finishes twice electrode heating for the current heat and the steel ladle is in a treatment position.
In a specific embodiment, the control method further includes: if the first station is a heating stage and the electrode is on the second station, monitoring whether the second station is currently in the heating stage, if not, controlling the electrode to be switched to the first station, and if so, the electrode does not act. As shown in fig. 2, the first station and the second station each include a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, and each station includes a plurality of heating processes.
Wherein the working phase further comprises: and if the second station is monitored to be the heating stage, monitoring the working stage of the second station at the present time at preset time intervals until the second station is obtained to be the waiting stage, the pre-heating stage or the post-heating stage, and switching the control electrode to the first station.
Specifically, when the first station enters the heating stage, the second model judges the position of the electrode. When the electrode is currently at the second station, the second-level model monitors the current stage of the second station, and if the second station is at a waiting stage, a pre-heating stage or a post-heating stage, the second-level model sends an instruction to the first-level system to switch the electrode to the first station. When the electrode is currently at the second station, the second-stage model monitors the current stage of the second station, if the second station is in the heating stage, the second-stage model monitors the current stage of the second station every preset time length WaitTime1 until the second station is in the waiting stage, the pre-heating stage or the post-heating stage and sends a command to the first-stage system to switch the electrode to the first station. The preset duration WaitTime1 may be designed according to actual production requirements, for example, the WaitTime1 has a value range of 2-10 s.
For example, when it is determined that the electrode is currently at the second station and the second station is at the heating stage, the second-stage model monitors the current stage of the second station at intervals of 3 seconds, if the current stage of the second station is the heating stage, the second-stage model monitors the current stage of the second station again at the next 3 seconds, and if the current stage of the second station is the waiting stage, the pre-heating stage or the post-heating stage, the second-stage model sends a command to the first-stage system to switch the electrode from the second station to the first station, thereby realizing automatic switching control of the electrode in the duplex position in the LF smelting process.
Specifically, when the first station enters the heating stage, and the secondary model determines that the electrode is currently at the first station, the secondary model will start calculating the first heating time HeatTime1 of the current heat electrode.
As an alternative embodiment, determining the first heating time HeatTime1 of the electrode may include: the first heating time HeatTime1 of the electrode is determined based on the temperature of the steel grade as it enters the casting machine, the temperature of the molten steel, the predicted temperature drop in the production of the steel grade, the preset temperature correction value, and the preset heating rate of the electrode.
Specifically, the method for calculating the first heating time HeatTime1 may be: heatTime 1= (TeteAim-Temp0+AlloyTempDrop+FluxTempDrop+CoolTempDrop-TempCorr)/HeatRate
Wherein, tempAim is the target temperature of the steel grade entering the casting machine, and the unit is the temperature; temp0 is the current temperature of molten steel, and is in units of ℃; alloyTempdrop is the predicted temperature drop caused by the subsequent addition of alloy into the steel grade, and the unit is the temperature; fluxTempDrop is the predicted temperature drop caused by the subsequent addition of slag into the steel grade, and is in units of ℃; coolTempdrop is the temperature drop of molten steel in unit of argon blowing or hoisting process; tempCorr is a temperature correction value, the unit temperature is 5-10 ℃, and the temperature correction value is used for preventing the overheating of molten steel caused by overlong primary heating time; the HeatRate is the electrode heating rate, the unit ℃/min, and is a parameter directly related to electrode equipment, and the value range is 3-7 ℃/min.
The target temperature TempAim when the steel grade enters the casting machine is a steel grade set value, the expected temperature drop AlloyTempDrop caused by the subsequent addition of alloy into the steel grade is a steel grade set value, and the expected temperature drop FluxTempDrop caused by the subsequent addition of slag into the steel grade is a steel grade set value.
As an alternative embodiment, the obtaining of the molten steel temperature may include: and determining the temperature of the molten steel based on the temperature measurement result of the molten steel, the time of the current heating system, the temperature measurement time of the molten steel and the preset temperature drop rate in the argon blowing process of the steel ladle.
In a specific embodiment, the current temperature of the Temp0 molten steel may be a calculated value, and specifically, a calculation formula of Temp0 may be:
Temp0＝TempMeas-(TimeSystem-TimeMeas)*TempDropRate1
wherein, tempMeas is the last temperature measurement result, and the unit is the temperature; the TimeSystemis the time of the current primary system; timeas is the last temperature measurement time; the TempDropRate1 is the temperature drop rate of the ladle argon blowing process, the unit speed per minute and the value range is 0.5-2.5 speed per minute.
Alternatively, temp0 may also be an estimate based on empirical estimation.
As an alternative embodiment, the obtaining of the temperature drop CoolTempDrop in the process of argon blowing or hoisting of the molten steel may include: determining the residual pouring time of the current large ladle of the casting machine based on the residual molten steel amount of the large ladle of the casting machine, the drawing speed of the casting machine, the sectional area of a casting blank and the density of molten steel; determining the temperature drop of the molten steel argon blowing or hoisting process based on the residual pouring time, the preset steel ladle hoisting time, the preset temperature drop rate of the steel ladle argon blowing process and the preset temperature drop rate of the steel ladle hoisting process.
In a specific embodiment, the temperature drop CoolTempDrop in the molten steel argon blowing or hoisting process may be a calculated value, and specifically, the calculation formula of CoolTempDrop may be:
CoolTempDrop＝(TimePourLeft-TimeTrans)*TempDropRate1+TimeTrans*TempDropRate2
wherein, timePourLeft is the residual casting time of the ladle molten steel of the current casting machine, the unit minutes, the calculation formula is TimePourLeft=the residual molten steel quantity of the ladle/[ casting machine pulling speed x cross-sectional area x molten steel density ]; timeTrans is the steel ladle hoisting time, unit minutes, and the value is 7-25 minutes according to the specific production condition; the TempDropRate1 is the temperature drop rate of the ladle argon blowing process, the unit speed per minute and the value range is 0.5-2.5 speed per minute; the TempDropRate2 is the temperature drop rate in the ladle hoisting process, and the unit speed per minute is 0.3-1 speed per minute.
The casting machine pulling rate is a real-time measurement value, the cross-sectional area is a set value (fixed value), and the molten steel density is a fixed physical parameter.
In a specific embodiment, after determining the first heating time HeatTime1 of the electrode, the secondary model issues the first heating time HeatTime1 of the electrode to the primary system, which controls the electrode to drop to the process position and begin heating. After heating starts, the primary system starts timing until reaching the first heating time HeatTime1, and lifts the electrode away from the molten steel surface to realize the first heating of the electrode.
Before the temperature of the electrode after the heating is obtained, the secondary model also needs to judge whether slag is added and alloy is added in the heat and judge whether the heating of the electrode is finished for the first time, if the secondary model judges that slag is added, alloy is added in the heat and the heating of the electrode is finished for the first time, the secondary model starts to wait for a new temperature measurement result, namely the temperature measurement result after the first heating of the electrode.
And after the temperature measurement result after the first heating of the electrode is obtained, calculating the second heating time HeatTime2 of the electrode of the heat. The secondary model issues electrode second heating time HeatTime2 to the primary system. The primary system control electrode is lowered to the processing position to start heating. After heating starts, the primary system starts timing until reaching the second heating time HeatTime2, and then lifts the electrode away from the molten steel surface to finish the second heating, and the first station enters a post-heating stage after the second heating is finished.
Specifically, the method for calculating the second heating time HeatTime2 may be:
HeatTime2＝(TempAim-Temp1+CoolTempDrop1)/HeatRate
wherein, tempAim is the target temperature of the steel grade entering the casting machine, and the unit is the temperature; temp1 is the current temperature of molten steel, and is in units of ℃; coolTempDrop1 is the temperature drop of molten steel in unit of argon blowing or hoisting process; the HeatRate is the electrode heating rate, the unit ℃/min, and is a parameter directly related to electrode equipment, and the value range is 3-7 ℃/min.
Since the slag and the alloy are added to the refining furnace when the electrode is heated for the second time, the second heating time is calculated without considering the influence of the added slag and alloy on the temperature of the molten steel, unlike the calculation of the first heating time. In addition, the temperature correction value is used for preventing the molten steel from overheating caused by the overlong first heating time, so that the second heating time is also not needed to be considered in calculation.
As an alternative embodiment, the obtaining of the molten steel temperature may include: and determining the temperature of the molten steel based on the temperature measurement result of the molten steel, the time of the current heating system, the temperature measurement time of the molten steel and the preset temperature drop rate in the argon blowing process of the steel ladle.
In a specific embodiment, the current temperature of the molten steel of Temp1 may be a calculated value, and specifically, the calculation formula of Temp1 may be:
Temp1＝TempMeas-(TimeSystem-TimeMeas)*TempDropRate1
wherein, tempMeas is the last temperature measurement result, and the unit is the temperature; the TimeSystemis the current system time; timeas is the last temperature measurement time; the TempDropRate1 is the temperature drop rate of the ladle argon blowing process, the unit speed per minute and the value range is 0.5-2.5 speed per minute.
In addition, in the calculation of Temp1 and Temp0, except that the temperature drop rate Temp droplate 1 in the ladle argon blowing process is a fixed quantity, the others are variables. Therefore, temp1 and Temp0 are different values.
Alternatively, temp1 may be an estimate based on empirical estimation.
As an alternative embodiment, the obtaining of the temperature-reduced CoolTempDrop1 in the process of argon blowing or hoisting of the molten steel may include: determining the residual pouring time of the current large ladle of the casting machine based on the residual molten steel amount of the large ladle of the casting machine, the drawing speed of the casting machine, the sectional area of a casting blank and the density of molten steel; determining the temperature drop of the molten steel argon blowing or hoisting process based on the residual pouring time, the preset steel ladle hoisting time, the preset temperature drop rate of the steel ladle argon blowing process and the preset temperature drop rate of the steel ladle hoisting process.
In a specific embodiment, the temperature drop CoolTempDrop1 in the molten steel argon blowing or hoisting process may be a calculated value, and specifically, the calculation formula of CoolTempDrop1 may be:
CoolTempDrop1＝(TimePourLeft-TimeTrans)*TempDropRate1+TimeTrans*TempDropRate2
wherein, timePourLeft1 is the residual casting time of the ladle molten steel of the current casting machine, the unit minutes, and the calculation formula is TimePourLeft1 = ladle residual molten steel amount/[ casting machine pull speed x cross-sectional area x molten steel density ]; timeTrans is the steel ladle hoisting time, unit minutes, and the value is 7-25 minutes according to the specific production condition; the TempDropRate1 is the temperature drop rate of the ladle argon blowing process, the unit speed per minute and the value range is 0.5-2.5 speed per minute; the TempDropRate2 is the temperature drop rate in the ladle hoisting process, and the unit speed per minute is 0.3-1 speed per minute.
It should be noted that, the remaining casting time TimePourLeft1 of the ladle of the current casting machine is a variable, which is continuously changed as the smelting process advances, so that CoolTempDrop1 may have different values from CoolTempDrop.
The control method of the electrode in the ladle refining furnace provided by the application will be fully described below with reference to two specific cases.
Case 1: implementation case of automatic control method taking first station as main body station
As shown in table 1 below, the values for the parameters are as follows:
TABLE 1
Step one, the LF smelting process is divided into four stages of a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, and the two-stage model automatically judges the current stage of the two stations of the LF furnace.
And step two, judging the position of the electrode by the secondary model after the first station enters the heating stage. The electrode is currently at the second station, the second-level model judges the current stage of the second station, the second station is at the waiting stage, and the second-level model sends an instruction to the first-level system to switch the electrode to the first station.
And thirdly, judging that when the electrode is currently at the first station, calculating the first heating time HeatTime1 of the electrode of the heat by the secondary model. Wherein Temp 0=1561-1.2 x 0.8=1560 ℃; remaining casting time timepourleft=61/[ 1.1×0.26×7] =30.5 min; cooling temperature drop= (30.5-12) 0.8+12 0.4=19.6 ℃ in the process of argon blowing or hoisting of molten steel;
HeatTime 1= (1585-1579+6+5+19.6-5)/3.1=10.2 min.
And step four, the secondary model transmits the first heating time HeatTime1 of the electrode, namely 10.2min, to the primary system.
And fifthly, controlling the electrode of the primary system to descend and start heating. After heating starts, the first-stage system starts timing until reaching the first heating time HeatTime1, namely 10.2min, and electrode lifting is performed to complete the first heating.
Step six, the secondary model judges that slag is added, alloy is added and the heating of the first electrode is finished in the current heat. And the secondary model obtains a temperature measurement result after the electrode is heated for the first time and calculates the second heating time HeatTime2 of the electrode. Wherein Temp0 = 1588-1.4 x 0.8 = 1587 ℃; remaining casting time timepourleft=39/[ 1.0×0.26×7] =21.4 min; cooling temperature drop= (21.4-12) 0.8+12 0.4=12.3 ℃ in the process of argon blowing or hoisting of molten steel;
HeatTime 2= (1585-1587+12.3)/3.1=3.3 min.
And step seven, the secondary model transmits the electrode second heating time HeatTime2, namely 3.3min, to the primary system.
And step eight, the primary system controls the electrode to descend and start heating. After heating, the first-stage system starts timing until reaching the second heating time HeatTime2, namely 3.3min, the electrode is lifted to finish the second heating, and the first station enters a post-heating stage after the second heating is finished.
Case 2: implementation case of automatic control method taking second station as main body station
As shown in table 2 below, the values of the parameters are as follows:
TABLE 2
Step one, the LF smelting process is divided into four stages of a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, and the two-stage model automatically judges the current stage of the two stations of the LF furnace.
And step two, judging the position of the electrode by the secondary model after the second station enters the heating stage. The electrode is currently at the first station, the second-level model judges the current stage of the first station, if the first station is at the heating stage, the second-level model judges the current stage of the first station every 8 seconds until the first station (in) is judged to enter the post-heating stage, and the second-level model sends an instruction to the first-level system to switch the electrode to the second station.
And thirdly, judging that if the electrode is currently at the second station, calculating the first heating time HeatTime1 of the electrode of the heat by the secondary model.
Wherein Temp0 = 1575-1 x 1.2 = 1573.8 ℃; remaining casting time timepourleft=102/[ 1.3×0.26×7] =43.1 min; cooling temperature drop= (43.1-15) 1.2+15 0.5=41.2 ℃ in the process of argon blowing or hoisting of molten steel;
HeatTime 1= (1580-1573.8+4+4+41.2-8)/3.1=11.3 min.
And step four, the secondary model transmits the first heating time HeatTime1 of the electrode, namely 11.3min, to the primary system.
And fifthly, controlling the electrode of the primary system to descend and start heating. After heating starts, the first-stage system starts timing until reaching the first heating time HeatTime1, namely 11.3min, and electrode lifting is performed to complete the first heating.
Step six, the secondary model judges that slag is added, alloy is added and the heating of the first electrode is finished in the current heat. And the secondary model obtains a temperature measurement result after the electrode is heated for the first time and calculates the second heating time HeatTime2 of the electrode. Wherein Temp0 = 1587-1.5 x 1.2 = 1585.2 ℃; remaining casting time timepourleft=62/[ 1.1×0.26×7] =31 min; cooling temperature drop in the process of argon blowing or hoisting of molten steel is 1.2+12, 0.5=25.2 ℃;
HeatTime2= (1580-1585.2+25.2)/4.2=4.8 min.
And step seven, the secondary model transmits the electrode second heating time HeatTime2, namely 4.8min, to the primary system.
And step eight, the primary system controls the electrode to descend and start heating. After heating, the first-stage system starts timing until reaching the second heating time HeatTime2, namely 4.8min, the electrode is lifted to finish the second heating, and the second station enters a post-heating stage after the second heating is finished.
In summary, according to the method for controlling the electrode in the ladle refining furnace provided by the embodiment of the invention, the important parameters such as the casting state of the casting machine and the like related to the calculation of the LF electrode heating time are brought into a calculation formula, so that the accurate calculation of the electrode heating time is realized. Meanwhile, the automatic control device is combined with the primary automatic control, so that the automatic switching control of the electrodes in the LF smelting process and the accurate control of the heating time in the double-station process can be realized, and the automation level can be effectively improved.
In a second aspect, based on the same inventive concept, the present embodiment provides a control apparatus of an electrode in a ladle refining furnace, as shown in fig. 3, including:
the first time determining module 401 is configured to determine a first heating time of the electrode if it is monitored that the working stage of the first station is in the heating stage and the electrode is on the first station, and send the determined first heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the first heating time;
a temperature acquisition module 402, configured to acquire a temperature of the electrode after the heating is completed;
the second time determining module 403 is configured to determine a second heating time of the electrode based on the temperature, and send the second heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the second heating time.
As an alternative embodiment, the apparatus further comprises: the control module is used for monitoring whether the second station is a waiting stage, a pre-heating stage or a post-heating stage currently if the first station is a heating stage and the electrode is positioned on the second station; if yes, the control electrode is switched to the first station.
As an alternative embodiment, the working phase further comprises: a waiting phase, a pre-heating phase and a post-heating phase, the control module being further configured to: if the current working stage of the second station is a heating stage, monitoring the current working stage of the second station every preset time period until the second station is a waiting stage, a pre-heating stage or a post-heating stage, and switching the control electrode to the first station.
As an alternative embodiment, the first time determining module 401 is specifically configured to: the first heating time of the electrode is determined based on the temperature of the steel grade as it enters the casting machine, the temperature of the molten steel, the predicted temperature drop in the production of the steel grade, the preset temperature correction value, and the preset heating rate of the electrode.
As an alternative embodiment, the first time determining module 401 is specifically configured to: determining the residual pouring time of the current large ladle of the casting machine based on the residual molten steel amount of the large ladle of the casting machine, the drawing speed of the casting machine, the sectional area of a casting blank and the density of molten steel; determining the temperature drop of the molten steel argon blowing or hoisting process based on the residual pouring time, the preset steel ladle hoisting time, the preset temperature drop rate of the steel ladle argon blowing process and the preset temperature drop rate of the steel ladle hoisting process.
As an alternative embodiment, the first time determining module 401 is specifically configured to: and determining the temperature of the molten steel based on the temperature measurement result of the molten steel, the time of the current heating system, the temperature measurement time of the molten steel and the preset temperature drop rate in the argon blowing process of the steel ladle.
The above modules may be implemented by software code, in which case the above modules may be stored in a memory of the control device. The above modules may equally be implemented by hardware, such as an integrated circuit chip.
The control device for the electrode in the ladle refining furnace provided by the embodiment of the invention has the same implementation principle and the same technical effects as those of the embodiment of the method, and for the purposes of brief description, the corresponding contents in the embodiment of the method can be referred to for the parts of the embodiment of the device which are not mentioned.
In a third aspect, based on the same inventive concept, the present embodiment provides an electronic device 500, as shown in fig. 4, including: a memory 501, a processor 502 and a computer program 503 stored in the memory and executable on the processor, the processor 502 implementing the steps of the method for controlling an electrode in a ladle refining furnace according to the first aspect described above when executing the program.
In a fourth aspect, based on the same inventive concept, the present embodiment provides a non-transitory computer readable storage medium, which when executed by a processor of the electronic device 500, enables the electronic device 500 to perform a method of controlling an electrode in a ladle refining furnace, comprising the steps of the method of any of the preceding first aspects.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
While preferred embodiments of the present invention have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the invention.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present invention without departing from the spirit or scope of the invention. Thus, it is intended that the present invention also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (8)
1. A control method of an electrode in a ladle refining furnace, characterized in that the refining furnace comprises a double-station heating system, the double-station heating system comprises a heating system, a first station and a second station, the heating system, the first station and the second station are mutually connected, the first station and the second station are used for heating the electrode under the control of the heating system, and the method comprises the following steps:
if the working stage of the first station is monitored to be in a heating stage and the electrode is positioned on the first station, determining the first heating time of the electrode, and sending the determined first heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the first heating time;
acquiring the temperature of the electrode after heating;
determining a second heating time of the electrode based on the temperature, and sending the second heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the second heating time;
if the first station is a heating stage and the electrode is positioned on the second station, monitoring whether the current working stage of the second station is in the heating stage, and if not, controlling the electrode to be switched to the first station;
the working phase further comprises: and if the current working phase of the second station is a heating phase, monitoring the current working phase of the second station every preset time period until the second station is the waiting phase, the pre-heating phase or the post-heating phase, and controlling the electrode to be switched to the first station.
2. The method of claim 1, wherein determining the first heating time of the electrode comprises:
the first heating time of the electrode is determined based on the temperature of the steel grade as it enters the casting machine, the temperature of the molten steel, the predicted temperature drop in the production of the steel grade, the preset temperature correction value, and the preset heating rate of the electrode.
3. The method of claim 2, wherein the predicted temperature drop in the production of the steel grade comprises a predicted temperature drop caused by adding alloy to the steel grade, a predicted temperature drop caused by adding slag to the steel grade, and a temperature drop in the argon blowing or hoisting process of the molten steel, wherein the obtaining of the temperature drop in the argon blowing or hoisting process of the molten steel comprises:
determining the residual pouring time of the current large ladle of the casting machine based on the residual molten steel amount of the large ladle of the casting machine, the drawing speed of the casting machine, the sectional area of a casting blank and the density of molten steel;
and determining the temperature drop of the molten steel in the argon blowing or hoisting process based on the residual pouring time, the preset steel ladle hoisting time, the preset temperature drop rate in the argon blowing process of the steel ladle and the preset temperature drop rate in the steel ladle hoisting process.
4. The method of claim 2, wherein the obtaining of the molten steel temperature comprises:
and determining the temperature of the molten steel based on the temperature measurement result of the molten steel, the time of the current heating system, the temperature measurement time of the molten steel and the preset temperature drop rate in the argon blowing process of the steel ladle.
5. The method of claim 1, wherein determining the second heating time of the electrode comprises:
and determining the second heating time of the electrode based on the temperature of the steel grade when entering the casting machine, the current temperature of the molten steel, the expected temperature drop in steel grade production and the preset heating rate of the electrode.
6. An apparatus for implementing the method of any one of claims 1-5, comprising:
the first time determining module is used for determining first heating time of the electrode if the working stage of the first station is in a heating stage and the electrode is on the first station, and sending the determined first heating time to the heating system so that the heating system controls the first station to heat the electrode according to the first heating time;
the temperature acquisition module is used for acquiring the temperature of the electrode after heating is completed;
a second time determining module, configured to determine a second heating time of the electrode based on the temperature, and send the second heating time to the heating system, so that the heating system controls the first station to heat the electrode according to the second heating time;
if the first station is a heating stage and the electrode is on the second station, monitoring whether the current working stage of the second station is in the heating stage, and if not, controlling the electrode to be switched to the first station;
the working phase further comprises: and if the current working phase of the second station is a heating phase, monitoring the current working phase of the second station every preset time period until the second station is the waiting phase, the pre-heating phase or the post-heating phase, and controlling the electrode to be switched to the first station.
7. An electronic device, comprising: memory, a processor and a computer program stored on the memory and executable on the processor, which processor implements the steps of the method according to any one of claims 1-5 when the program is executed.
8. A computer readable storage medium, on which a computer program is stored, characterized in that the program, when being executed by a processor, implements the steps of the method according to any one of claims 1-5.
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| JPH07150216A (en) * | 1993-11-30 | 1995-06-13 | Aichi Steel Works Ltd | Device for automatically operating ladle refining |
| CN100465292C (en) * | 2006-12-19 | 2009-03-04 | 江苏沙钢集团有限公司 | Rotating steel ladle refining furnace |
| CN101592964B (en) * | 2009-06-26 | 2011-12-28 | 北京首钢自动化信息技术有限公司 | Method for controlling forecast of molten steel temperature of double-station LF furnace |
| CN102277468B (en) * | 2010-06-12 | 2013-04-24 | 上海梅山钢铁股份有限公司 | Real-time forecasting method of LF refining furnace molten steel temperature |
| CN202116585U (en) * | 2011-06-22 | 2012-01-18 | 西安电炉研究所有限公司 | Electrode rotating mechanism for double-station electrode rotating type LF (Ladle Furnace) refining furnace |
| CN102660661A (en) * | 2012-06-05 | 2012-09-12 | 中冶华天工程技术有限公司 | Online multifunctional double-station LF (Low-Frequency) furnace system and online LF furnace steelmaking method |
| CN204702774U (en) * | 2015-05-13 | 2015-10-14 | 无锡四方电炉有限公司 | Double-station LF refining furnace |
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