CN114381573A - 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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Abstract
The invention discloses a control method, a device, equipment and a medium for 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 monitored to be 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 heated electrode; and 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. 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 method, a device, equipment and a medium for controlling an electrode in a ladle refining furnace.
Background
The ladle refining (LF) furnace has the advantages of simple equipment, low investment cost, flexible operation and good refining effect, and is a top-line start in the metallurgical industry. The LF furnace refining mainly depends on white slag in a barrel, argon is blown into the barrel to stir in a low-oxygen atmosphere (the oxygen content is 5 percent), and molten steel passing through a primary refining furnace is heated by a graphite electrode to be refined. Because the argon stirring accelerates the chemical reaction between the slag and the steel, the electric arc heating is used for temperature compensation, and the longer refining time can be ensured, so that the oxygen and sulfur contents in the steel can be reduced, and the inclusions are rated as 0-0.1 grade according to ASTM. The steel grade treated by the LF furnace almost relates to all steel grades from special steel to general steel, and different process operation systems are adopted in the production according to the requirement of quality control. In various secondary refining equipment, the LF furnace has high comprehensive performance-price ratio.
In the steel smelting process, the LF furnace is a key process for producing high-quality steel. However, due to different requirements of customers on steel grades and imperfect process system, the LF furnace in the prior art has long time for treating common steel, so that the power consumption, the consumption of auxiliary raw materials and refractory materials are 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 control device, control equipment and a control 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 the following technical solutions through an embodiment of the present invention:
a control method of an electrode in a ladle refining furnace is 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 connected with each other, and 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 monitored to be 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 heated electrode; and 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.
Preferably, if the first station is a heating stage and the electrode is located 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.
Preferably, the working phase further comprises: and monitoring the current working stage of the second station every preset time length if the current working stage of the second station is a heating stage, and controlling the electrode to be switched to the first station until the second station is the waiting stage, the pre-heating stage or the post-heating stage.
Preferably, the determining the first heating time of the electrode comprises: and determining the first heating time of the electrode based on the temperature of the steel when entering the casting machine, the temperature of molten steel, the predicted temperature drop in the steel production, the preset temperature correction value and the preset heating rate of the electrode.
Preferably, the predicted temperature drop in the steel production includes a predicted temperature drop caused by adding alloy into the steel, a predicted temperature drop caused by adding slag into the steel, and a temperature drop in the molten steel argon blowing or hoisting process, wherein the obtaining of the temperature drop in the molten steel argon blowing or hoisting process includes: determining the residual pouring time of the current ladle of the casting machine based on the residual molten steel amount of the ladle of the casting machine, the casting machine pulling speed, the section area of a casting blank and the molten steel density; and determining the temperature drop of the molten steel in the argon blowing or hoisting process based on the residual pouring time, the preset ladle hoisting time, the preset temperature drop rate of the ladle in the argon blowing process and the preset temperature drop rate of the ladle in the hoisting process.
Preferably, the obtaining of the temperature of the molten steel 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 of the argon blowing process of the steel ladle.
Preferably, the determining a second heating time of the electrode based on the temperature includes: and determining the second heating time of the electrode based on the temperature of the steel when entering the casting machine, the current temperature of the molten steel, the predicted temperature drop in the steel production and the preset heating rate of the electrode.
In a second aspect, the present invention provides the following technical solutions through an embodiment of the present invention:
a control apparatus of an electrode in a ladle refining furnace, comprising:
the first time determining module is used for determining the first heating time of the electrode and sending the determined first heating time to the heating system if the working stage of a first station is monitored to be in a heating stage and the electrode is monitored to be on the first station, 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 finished;
and the second time determining module is used for 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 third aspect, the present invention provides the following technical solutions through an embodiment of the present invention:
an electronic device, comprising: 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 when executing the program.
One or more technical solutions provided in the embodiments of the present application have at least the following technical effects or advantages:
the embodiment of the invention provides a method, a device, equipment and a medium for controlling an electrode in a ladle refining furnace, wherein the method comprises the following steps: whether the first station is a heating stage or not is determined by monitoring the current working stage of the first station, if so, the first heating time of the electrode is determined, and the determined first heating time is sent 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 heated electrode, 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. This application is in the heating stage when having confirmed first station, and the electrode is in on first station, just begins to calculate the first time heating time of electrode to obtain the temperature after the electrode heating, confirm the second time heating time of electrode based on heating temperature, thereby after having confirmed the first time heating time of this heat refining furnace electrode, have slag charge to add, have the alloy to add and after the first heating is finished, confirm the second time heating time of this heat refining furnace electrode again after confirming this heat. 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 in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
FIG. 1 is a flowchart of a method of controlling an electrode in a ladle refining furnace according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of automatic double-station mutual switching control according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a control apparatus 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
The embodiment of the application provides a control method, a control device, control equipment and a control medium for an electrode in a ladle refining furnace, 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 smelting process of the refining furnace is effectively improved.
In order to solve the technical problems, the general idea of the embodiment of the application is as follows:
a control method of an electrode in a ladle refining furnace is 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 connected with each other, and 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 monitored to be 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 heated electrode; and 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 order to better understand the technical solution, the technical solution will be described in detail with reference to the drawings and the specific embodiments.
It should be noted that, in the present application, the main execution body of the control method for the electrode in the ladle refining furnace may be a secondary model or an upper computer, and the specific embodiment of the present application takes the secondary model as an example to describe in detail the control method for the electrode in the ladle refining furnace.
In a first aspect, an embodiment of the present invention provides a method for controlling an electrode in a ladle refining furnace, the refining furnace including a dual-station heating system, the dual-station heating system including a heating system (a primary system), a first station, and a second station, the heating system, the first station, and the second station being connected to each other, the first station and the second station being configured to heat the electrode under the control of the heating system, and 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 monitored to be in a heating stage and the electrode is monitored to be 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;
and 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 the implementation process, before monitoring the current working stage of the first station, the monitoring may include: based on a preset division rule, the LF smelting process is divided into four stages, namely a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, namely the four stages shown in figure 2, and the two-stage model automatically judges the current stages of the first station and the second station of the LF furnace.
Specifically, the preset partition rule may be: the waiting stage division rule is that the ladle at the current station is not in the processing position; the division rule of the stage before heating is that the temperature is not measured in the current station in the current heat and the steel ladle is in the processing position; the heating stage is divided into at least one time of temperature measurement in the current station, two times of electrode heating is not completed in the current furnace and the steel ladle is in the processing position; and the stage division rule after heating is that the electrode heating is finished twice in the current station and the furnace number, and the steel ladle is positioned at a processing position.
In a specific embodiment, the control method further includes: if the first station is in the heating stage and the electrode is on the second station, monitoring whether the second station is in the heating stage currently, if not, controlling the electrode to be switched to the first station, and if so, not actuating the electrode. 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 multiple heating processes.
Wherein the working phase further comprises: and in the waiting stage, the pre-heating stage and the post-heating stage, if the second station is monitored to be the heating stage currently, monitoring the working stage of the second station at present every preset time length until the second station is the waiting stage, the pre-heating stage or the post-heating stage, and controlling the electrode to be switched to the first station.
Specifically, after the first station enters the heating stage, the secondary model will determine the position of the electrode. And when the electrode is at the second station, the secondary model monitors the current stage of the second station, and if the second station is in a waiting stage, a pre-heating stage or a post-heating stage, the secondary model sends an instruction to the primary system to switch the electrode to the first station. When the electrode is at the second station, the secondary model monitors the current stage of the second station, if the second station is in the heating stage, the secondary model monitors the current stage of the second station every preset time WaitTime1 until the second station is in the waiting stage, the pre-heating stage or the post-heating stage, and sends an instruction to the primary system to switch the electrode to the first station. The preset time WaitTime1 can be designed according to actual production needs, for example, the value range of WaitTime1 is 2-10 s.
For example, when it is determined that the electrode is currently at the second station and the second station is in the heating stage, the secondary model monitors the current stage of the second station every 3 seconds, if the current stage of the second station is the heating stage, the secondary model monitors the current stage of the second station again in 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 secondary model sends an instruction to the primary system to switch the electrode from the second station to the first station, so that the automatic switching control of the electrode in the double stations in the LF smelting process is realized.
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 to calculate the heat time HeatTime1 for the first time of the electrode in this furnace.
As an alternative embodiment, determining the first heating time HeatTime1 of the electrode may include: and determining the first heating time HeatTime1 of the electrode based on the temperature of the steel when entering the casting machine, the temperature of molten steel, the predicted temperature drop in the steel production, 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: HeatTime1 ═ TempAim-Temp0+ AlloyTempDrop + FluxTempDrop + CoolTempDrop-TempCorr)/HeatRate
Wherein TempAim is the target temperature of the steel grade when entering a casting machine, and the unit is; temp0 is the current temperature of molten steel in unit; the AlloyTempDrop is the predicted temperature drop caused by the subsequent addition of alloy to the steel grade, and the unit is; FluxTempDrop is the predicted temperature drop caused by the subsequent addition of slag charge to the steel grade, unit ℃; CoolTempdrop is the temperature drop in the argon blowing or hoisting process of the molten steel, and the unit is; TempCorr is a temperature correction value, and the unit temperature is 5-10 ℃ to prevent overheating of the molten steel caused by overlong first heating time; the HeatRate is the electrode heating rate, unit ℃/minute, is a parameter directly related to electrode equipment, and the value range is 3-7 ℃/minute.
It should be noted that the target temperature tempair when the steel grade enters the casting machine is the set value of the steel grade, the predicted temperature drop AlloyTempDrop caused by the subsequent addition of alloy to the steel grade is the set value of the steel grade, and the predicted temperature drop FluxTempDrop caused by the subsequent addition of slag to the steel grade is the set value of the steel grade.
As an optional 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 of the argon blowing process of the steel ladle.
In a specific embodiment, the current temperature of Temp0 molten steel may be a calculated value, and specifically, the calculation formula of Temp0 may be:
Temp0＝TempMeas-(TimeSystem-TimeMeas)*TempDropRate1
wherein TempMeas is the last temperature measurement result and is in unit ℃; the TimeSysteme is the time of the current level system; TimeMeas is the latest temperature measurement time; TempDropRate1 is the temperature drop rate of the ladle in the argon blowing process, and the unit ℃/minute is within the value range of 0.5-2.5 ℃/minute.
Alternatively, Temp0 may be an estimate based on empirical estimation.
As an optional embodiment, the obtaining of the temperature drop CoolTempDrop during the argon blowing of the molten steel or the hoisting process may include: determining the residual pouring time of the current ladle of the casting machine based on the residual molten steel amount of the ladle of the casting machine, the casting machine pulling speed, the section area of a casting blank and the molten steel density; and determining the temperature drop of the molten steel in the argon blowing process or the hoisting process based on the residual pouring time, the preset ladle hoisting time, the preset temperature drop rate of the ladle in the argon blowing process and the preset temperature drop rate of the ladle in the hoisting process.
In a specific embodiment, the CoolTempDrop during argon blowing of molten steel or hoisting may be a calculated value, and specifically, the calculation formula of the CoolTempDrop may be:
CoolTempDrop＝(TimePourLeft-TimeTrans)*TempDropRate1+TimeTrans*TempDropRate2
the method comprises the following steps of (1) obtaining a TimePourLeft value, wherein the TimePourLeft is the residual casting time of the ladle molten steel of the current casting machine in unit minute, and the calculation formula is TimePourLeft ═ ladle residual molten steel quantity/[ casting machine drawing speed: [ cross-sectional area:moltensteel density ]; the TimeTrans is the hoisting time of the steel ladle in unit of minutes, and the value is within the range of 7-25 minutes according to the specific production condition; TempDropRate1 is the temperature drop rate of the steel ladle in the argon blowing process, the unit ℃/minute, and the value range is 0.5-2.5 ℃/minute; TempDropRate2 is the temperature drop rate of the steel ladle in the hoisting process, and the unit ℃/minute is within the value range of 0.3-1 ℃/minute.
It should be noted that the casting machine pulling speed 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 processing position and start heating. After the heating is started, the primary system starts to time until the first heating time HeatTime1 is reached, and then the electrode is lifted away from the molten steel surface, so that the first heating of the electrode is realized.
It should be noted that before obtaining the temperature of the electrode after the heating is completed, the secondary model further needs to determine whether slag and alloy are added to the furnace, and determine whether the first electrode heating is completed, and if the secondary model determines that slag and alloy are added to the furnace and the first electrode heating is completed, the secondary model starts to wait for a new temperature measurement result, that is, the temperature measurement result after the first electrode heating.
After the temperature measurement result of the electrode after the first heating is obtained, the secondary model calculates the second heating time HeatTime2 of the electrode of the furnace. The secondary model issues an electrode second heating time HeatTime2 to the primary system. The first-level system controls the electrode to descend to the processing position to start heating. After heating is started, the primary system starts to time until reaching the second heating time Heattitime 2, the electrode is lifted away from the molten steel surface to finish the second heating, and the first station enters the 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 when entering a casting machine, and the unit is; temp1 is the current temperature of molten steel in unit; the CoolTempdrop1 is the temperature drop in the unit of argon blowing or hoisting process of molten steel; the HeatRate is the electrode heating rate, unit ℃/minute, is a parameter directly related to electrode equipment, and the value range is 3-7 ℃/minute.
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. The temperature correction value is set to prevent overheating of the molten steel due to an excessively long first heating time, and therefore, it is not necessary to consider the calculation of the second heating time.
As an optional 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 of the argon blowing process of the steel ladle.
In a specific embodiment, the current temperature of Temp1 molten steel 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 is in unit ℃; the TimeSystem is the current system time; TimeMeas is the latest temperature measurement time; TempDropRate1 is the temperature drop rate of the ladle in the argon blowing process, and the unit ℃/minute is within the value range of 0.5-2.5 ℃/minute.
It should be noted that, in the calculation of Temp1 and Temp0, the temperature drop rate TempDropRate1 is a fixed quantity in the process of blowing argon from the ladle, and other variables are all variables. Therefore, Temp1 and Temp0 are different values.
Alternatively, Temp1 may be an estimate based on empirical estimation.
As an optional embodiment, the obtaining of the CoolTempDrop1 in the argon blowing or hoisting process of the molten steel may include: determining the residual pouring time of the current ladle of the casting machine based on the residual molten steel amount of the ladle of the casting machine, the casting machine pulling speed, the section area of a casting blank and the molten steel density; and determining the temperature drop of the molten steel in the argon blowing process or the hoisting process based on the residual pouring time, the preset ladle hoisting time, the preset temperature drop rate of the ladle in the argon blowing process and the preset temperature drop rate of the ladle in the hoisting process.
In a specific embodiment, the temperature drop CoolTempDrop1 in the argon blowing or hoisting process of the molten steel may be a calculation value, and specifically, the calculation formula of CoolTempDrop1 may be:
CoolTempDrop1＝(TimePourLeft-TimeTrans)*TempDropRate1+TimeTrans*TempDropRate2
wherein the TimePourLeft1 is the residual casting time of the ladle molten steel of the current casting machine in unit minutes, and the calculation formula is TimePourLeft1 ═ ladle residual molten steel quantity/[ casting machine pulling speed:sectionarea:moltensteel density ]; the TimeTrans is the hoisting time of the steel ladle in unit of minutes, and the value is within the range of 7-25 minutes according to the specific production condition; TempDropRate1 is the temperature drop rate of the steel ladle in the argon blowing process, the unit ℃/minute, and the value range is 0.5-2.5 ℃/minute; TempDropRate2 is the temperature drop rate of the steel ladle in the hoisting process, and the unit ℃/minute is within the value range of 0.3-1 ℃/minute.
It should be noted that the remaining casting time TimePourLeft1 of the ladle of the current casting machine is a variable which changes continuously with the progress of smelting, so that the CoolTempDrop1 and CoolTempDrop may have different values.
The method for controlling the electrode in the ladle refining furnace provided by the present application will be fully described below with reference to two specific examples.
Case 1: implementation case of automatic control method with first station as main station
As shown in table 1 below, the values for each parameter are as follows:
TABLE 1
The method comprises the following steps that firstly, the LF smelting process is divided into four stages, namely a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, and a secondary model automatically judges the current stages of two stations of the LF furnace.
And step two, after the first station enters a heating stage, the secondary model judges the position of the electrode. The electrode is currently at a second station, the secondary model judges the current stage of the second station, the second station is in a waiting stage, and the secondary model sends an instruction to the primary system to switch the electrode to the first station.
And step three, judging that the electrode is at the first station currently by the secondary model, and calculating the first heating time HeatTime1 of the electrode of the furnace by the secondary model. Wherein Temp 0-1561.2 x 0.8-1560 deg.C; the remaining casting time, timepoirleft, is 61/[1.1 × 0.26 × 7] ═ 30.5 min; the temperature of the CoolTempdrop is reduced to (30.5-12) 0.8+12 0.4) 19.6 ℃ in the process of argon blowing or hoisting of the molten steel;
then HeatTime1 ═ 1585-.
And step four, the secondary model issues the electrode first heating time HeatTime1, namely 10.2min, to the primary system.
And step five, controlling the electrode to descend by the primary system to start heating. After heating is started, the primary system starts to time until reaching the first heating time HeatTime1, namely, the electrode is lifted for 10.2min to complete the first heating.
And step six, judging whether slag charge and alloy charge exist in the furnace and finishing the first electrode heating by the secondary model. The secondary model obtains the temperature measurement result after the first heating of the electrode and calculates the second heating time HeatTime2 of the electrode. Wherein Temp 0-1588-1.4-0.8-1587 ℃; the remaining casting time, TimePourLeft ═ 39/[1.0 × 0.26 × 7] ═ 21.4 min; the temperature of the CoolTempdrop is reduced to (21.4-12) 0.8+12 0.4-12.3 ℃ in the process of argon blowing or hoisting of the molten steel;
then, HeatTime2 ═ 1585-.
And seventhly, the secondary model issues the electrode second heating time HeatTime2, namely 3.3min, to the primary system.
And step eight, controlling the electrode to descend by the first-stage system to start heating. After heating is started, the primary system starts to time until reaching the second heating time HeatTime2, namely 3.3min, the electrode is lifted to finish the second heating, and after the second heating is finished, the first station enters the post-heating stage.
Case 2: implementation case of automatic control method with second station as main station
As shown in table 2 below, the values of the parameters are as follows:
TABLE 2
The method comprises the following steps that firstly, the LF smelting process is divided into four stages, namely a waiting stage, a pre-heating stage, a heating stage and a post-heating stage, and a secondary model automatically judges the current stages of two stations of the LF furnace.
And step two, after the second station enters the heating stage, the secondary model judges the position of the electrode. And if the first station is in the heating stage, the second-stage model judges the current stage of the first station every 8 seconds, and sends an instruction to the first-stage system to switch the electrode to the second station until the first station (in the heating stage) is judged.
And step three, if the electrode is judged to be at the second station currently by the secondary model, the secondary model calculates the heating time HeatTime1 of the electrode of the furnace.
Wherein Temp 0-1575-1-1.2-1573.8 ℃; the remaining casting time, timepoirreft ═ 102/[1.3 × 0.26 × 7] ═ 43.1 min; the temperature of the CoolTempdrop (43.1-15) 1.2+15 0.5 is reduced to 41.2 ℃ in the process of argon blowing or hoisting of the molten steel;
then HeatTime1 ═ 1580-1573.8+4+4+41.2-8)/3.1 ═ 11.3 min.
And step four, the secondary model issues the electrode first heating time HeatTime1, namely 11.3min, to the primary system.
And step five, controlling the electrode to descend by the primary system to start heating. After heating is started, the primary system starts to time until reaching the first heating time HeatTime1, namely 11.3min, the electrode is lifted to complete the first heating.
And step six, judging whether slag charge and alloy charge exist in the furnace and finishing the first electrode heating by the secondary model. The secondary model obtains the temperature measurement result after the first heating of the electrode and calculates the second heating time HeatTime2 of the electrode. Wherein Temp 0-1587-1.5 x 1.2-1585.2 ℃; the remaining casting time, TimePourLeft ═ 62/[1.1 × 0.26 ×. 7] ═ 31 min; the temperature of the CoolTempdrop is reduced to (31-15) 1.2+12 0.5) to 25.2 ℃ in the process of argon blowing of molten steel or hoisting;
then HeatTime2 ═ 1580-1585.2+25.2)/4.2 ═ 4.8 min.
And seventhly, the secondary model issues the electrode second heating time HeatTime2, namely 4.8min, to the primary system.
And step eight, controlling the electrode to descend by the first-stage system to start heating. After heating is started, the primary system starts to time until reaching the second heating time HeatTime2, namely 4.8min, the electrode is lifted to finish the second heating, and the second station enters the post-heating stage after the second heating is finished.
In summary, according to the control method of the electrode in the ladle refining furnace provided by the embodiment of the invention, important parameters such as the casting machine pouring state 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 electrode is combined with primary automatic control, the automatic double-station switching control and the accurate heating time control of the electrode in the LF smelting 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, comprising:
the first time determining module 401 is configured to determine first heating time of the electrode and send the determined first heating time to the heating system 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, so that the heating system controls the first station to heat the electrode according to the first heating time;
a temperature obtaining module 402, configured to obtain a temperature of the electrode after heating is completed;
and a second time determination module 403, 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 at present if the first station is a heating stage and the electrode is positioned on the second station; and if so, switching the control electrode to the first station.
As an alternative embodiment, the working phase further comprises: the control module is further configured to: and if the current working stage of the second station is a heating stage, monitoring the current working stage of the second station at preset time intervals 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 optional embodiment, the first time determining module 401 is specifically configured to: and determining the first heating time of the electrode based on the temperature of the steel when entering the casting machine, the temperature of molten steel, the predicted temperature drop in the steel production, the preset temperature correction value and the preset heating rate of the electrode.
As an optional embodiment, the first time determining module 401 is specifically configured to: determining the residual pouring time of the current ladle of the casting machine based on the residual molten steel amount of the ladle of the casting machine, the casting machine pulling speed, the section area of a casting blank and the molten steel density; and determining the temperature drop of the molten steel in the argon blowing process or the hoisting process based on the residual pouring time, the preset ladle hoisting time, the preset temperature drop rate of the ladle in the argon blowing process and the preset temperature drop rate of the ladle in the hoisting process.
As an optional 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 of the argon blowing process of the steel ladle.
The above modules may be implemented by software codes, and in this case, the modules may be stored in a memory of the control device. The above modules may also 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 realization principle and the same technical effect as the embodiment of the method, and for the sake of brief description, the corresponding content in the embodiment of the method can be referred to where the embodiment of the device is 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 on and executable on the memory, the processor 502 when executing the program implementing the steps of the method of controlling an electrode in a ladle refining furnace according to the first aspect as described above.
In a fourth aspect, based on the same inventive concept, the present embodiment provides a non-transitory computer-readable storage medium, wherein instructions, when executed by a processor of the electronic device 500, enable the electronic device 500 to perform a method of controlling an electrode in a ladle refining furnace, comprising the steps of any one of the methods of the first aspect.
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. Therefore, it is intended that the appended claims be interpreted as including 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 changes and modifications may be made in the present invention without departing from the spirit and scope of the invention. Thus, if such modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include such modifications and variations.
Claims (10)
1. A control method of an electrode in a ladle refining furnace is 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 connected with each other, and 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 monitored to be 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 heated electrode;
and 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.
2. The method of claim 1, further comprising:
and if the first station is in 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.
3. The method of claim 2, wherein the operational phase further comprises: and monitoring the current working stage of the second station every preset time length if the current working stage of the second station is a heating stage, and controlling the electrode to be switched to the first station until the second station is the waiting stage, the pre-heating stage or the post-heating stage.
4. The method of claim 1, wherein determining a first heating time of the electrode comprises:
and determining the first heating time of the electrode based on the temperature of the steel when entering the casting machine, the temperature of molten steel, the predicted temperature drop in the steel production, the preset temperature correction value and the preset heating rate of the electrode.
5. The method of claim 4, wherein the predicted temperature drop in steel grade production comprises a predicted temperature drop after alloy addition of a steel grade, a predicted temperature drop after slag addition of a steel grade, and a temperature drop during argon blowing or hoisting of molten steel, wherein the obtaining of the temperature drop during argon blowing or hoisting of molten steel comprises:
determining the residual pouring time of the current ladle of the casting machine based on the residual molten steel amount of the ladle of the casting machine, the casting machine pulling speed, the section area of a casting blank and the molten steel density;
and determining the temperature drop of the molten steel in the argon blowing or hoisting process based on the residual pouring time, the preset ladle hoisting time, the preset temperature drop rate of the ladle in the argon blowing process and the preset temperature drop rate of the ladle in the hoisting process.
6. The method of claim 4, 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 of the argon blowing process of the steel ladle.
7. The method of claim 1, wherein determining a second heating time of the electrode comprises:
and determining the second heating time of the electrode based on the temperature of the steel when entering the casting machine, the current temperature of the molten steel, the predicted temperature drop in the steel production and the preset heating rate of the electrode.
8. A control apparatus of an electrode in a ladle refining furnace, comprising:
the first time determining module is used for determining the first heating time of the electrode and sending the determined first heating time to the heating system if the working stage of a first station is monitored to be in a heating stage and the electrode is monitored to be on the first station, 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 finished;
and the second time determining module is used for 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.
9. An electronic device, comprising: memory, processor and computer program stored on the memory and executable on the processor, the processor implementing the steps of the method of any one of claims 1 to 7 when executing the program.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 7.
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