CN115896387A - Control method and system for automatic slag splashing of converter - Google Patents
Control method and system for automatic slag splashing of converter Download PDFInfo
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Abstract
The invention discloses a control method and a system for automatic slag splashing of a converter, wherein the method comprises the following steps: the slag splashing mode required to be adopted for automatically judging slag splashing of the furnace specifically comprises the following steps: collecting the liquid level, and comparing the liquid level with a first set value and a second set value; when the liquid level is less than a first set value, the furnace bottom is thinned, and a furnace bottom expanding mode is adopted; when the liquid level is greater than or equal to a first set value and less than or equal to a second set value, indicating that the furnace bottom is at a normal level, and adopting a furnace bottom maintenance mode; when the liquid level is greater than a second set value, indicating that the furnace bottom becomes thick, and adopting a furnace bottom lowering mode; automatically judging the seasoning amount during slag splashing; and receiving a slag splashing operation instruction, and performing slag splashing control according to the determined slag splashing mode and the seasoning amount. The invention automatically gives the amount of the seasoning, so that the weight of the slag splashing material is adjusted, the blindness of manual judgment is avoided, the slag splashing effect is improved, one-key slag splashing operation can be realized, and the labor intensity of operators is reduced.
Description
Technical Field
The invention belongs to the technical field of converter steelmaking, and particularly relates to a control method and a system for automatic slag splashing of a converter.
Background
In the process of converter steelmaking, the lining bricks are gradually eroded, when the erosion reaches a certain degree, in order to ensure safe production, the lining bricks need to be replaced by overhaul, and if the erosion of the lining bricks can be slowed down, the service life of the combined blown converter is prolonged, the smelting cost can be reduced.
After tapping of the converter is finished, the dense slag material and the nitrogen are added for cooling, the dilute slag with good fluidity is adjusted into the slag with proper fluidity (or viscosity), the slag with proper fluidity is impacted and adhered to the furnace wall through the high-pressure nitrogen, and the slag adhered to the furnace wall is cooled to form a protective layer to slow down direct washing of waste steel and high-temperature molten steel on furnace lining bricks, so that the function of protecting the furnace lining is achieved.
The slag splashing operation needs to be carried out according to the dry and dilute state of the slag, and different slag splashing modes are adopted according to the characteristics of the furnace condition, and generally 3 slag splashing modes are adopted, including a furnace bottom rising mode, a furnace bottom maintaining mode and a furnace bottom lowering mode.
At present, the slag splashing process of most converters in steel plants is manually operated, operators mainly carry out manual operation according to experience, operating regulations and the like in the slag splashing process of the converters, the weight of slag splashing materials needing to be input is set, the slag splashing gun position and the slag splashing flow are manually adjusted according to the furnace bottom conditions, and the slag splashing time is controlled by the operators.
During slag splashing operation, if the levels of operators are different and the operation is not standard, a good slag splashing effect can not be achieved, and even certain parts of the converter can be corroded more quickly. When an operator splashes slag, the position (height) of the slag splashing gun and the slag splashing flow need to be manually adjusted for many times according to experience, and the labor intensity of the operator is high.
When the slag splashing operation of the converter is carried out, the slag is too thin and cannot be splashed onto the furnace wall well, and a certain amount of cold materials (slag splashing materials) are required to be added to improve the slag condition, so that the slag splashing operation is facilitated. However, the judgment of the amount of the seasoning in the traditional slag splashing operation completely depends on manual experience at present, so that the seasoning amount is unreasonable, and the slag is dry and can not be splashed after the amount of the seasoning is increased; and after the reduction, the furnace slag is thin, and the furnace lining is washed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a control method and a control system for automatic slag splashing of a converter, which simplify the operation of an operator and improve the slag splashing effect.
The technical scheme of the invention is realized as follows: the invention discloses a control method for automatic slag splashing of a converter, which comprises the following steps:
the automatic slag splashing mode that needs to be adopted for determining slag splashing of the furnace comprises the following steps: collecting the liquid level, and comparing the liquid level with a first set value and a second set value;
when the liquid level is less than a first set value, adopting a furnace bottom expanding mode;
when the liquid level is greater than or equal to a first set value and less than or equal to a second set value, adopting a furnace bottom maintenance mode;
when the liquid level is greater than a second set value, a furnace bottom lowering mode is adopted;
automatically judging the seasoning amount during slag splashing;
and receiving a slag splashing operation instruction, and performing slag splashing control according to the judged slag splashing mode and the seasoning amount.
Further, when the furnace bottom expanding mode is adopted, firstly, seasonings are put into the gun, when the gun is put down to a set gas opening position, gas is opened, and the slag splashing gun position is located in a preset high gun position range;
when the furnace bottom maintenance mode is adopted, firstly, the gun is put down to a first set position, the seasoning is started, when the gun is put down to a set gas-opening position, the gas is opened, and the slag splashing gun position is located in the range of a preset middle gun position; the first set position is a 1/2 stroke position,
when the furnace bottom lowering mode is adopted, firstly, the gun is put down to a second set position, the seasoning is started, when the second set position is higher than the set gas starting position, the gun is continuously put down to the set gas starting position, the gas is started, when the second set position is equal to the set gas starting position, the gas is started firstly, the seasoning is then carried out, and the slag splashing gun position is located in the preset low gun position range;
the second setting position is lower than the first setting position, and the second setting position is close to the set air opening position.
Further, a hearth-expanding mode is adoptedWhen in use, the position of the slag splashing gun is 160-210 cm, and the air supply flow is 48000-55000Nm 3 /h；
When the mode of maintaining the furnace bottom is adopted, the slag splashing gun position is 130-160 cm, and the air supply flow is 52000-56000Nm 3 /h；
When the mode of lowering the furnace bottom is adopted, the slag splashing gun position is 100-130 cm, and the air supply flow is 52000-57000Nm 3 /h。
Further, the automatic determination of the seasoning amount during slag splashing specifically includes: and (3) acquiring the weight of the slag, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index, automatically judging the seasoning amount during slag splashing according to the weight of the slag, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index, and adding the corresponding amount of slag splashing material according to the judged seasoning amount during seasoning to improve the slag condition.
Further, the method for automatically judging the seasoning amount during slag splashing according to the weight of the slag, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index specifically comprises the following steps: the method comprises the steps of dividing the maximum range of the slag weight, the blowing stopping temperature and the blowing stopping oxygen content into a plurality of scoring intervals in advance, wherein each scoring interval corresponds to a set score, dividing the maximum range of the slag score into a plurality of scoring intervals, each scoring interval corresponds to a set seasoning amount, judging the scoring interval where the slag weight, the blowing stopping temperature and the blowing stopping oxygen content are located, respectively obtaining scores corresponding to the slag weight, the blowing stopping temperature and the blowing stopping oxygen content, obtaining a corresponding score according to a slag fluidity index, wherein the sum of the scores corresponding to the slag weight, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index is the slag score, and judging the scoring interval where the slag score is located, so that the corresponding seasoning amount can be obtained.
Further, the camera is used for shooting the slag surface in the converter during tapping, and the camera monitoring video is used for automatically identifying the slag fluidity index.
Further, the slag fluidity index is identified according to the slag caking condition, and is divided into different grades, and the different grades correspond to different scores.
Further, the method of the present invention further comprises the steps of: obtaining slag-forming time, holding time after slag forming and slag fluidity index during slag dumping, calculating slag splashing effect score according to a preset score evaluation rule, and feeding back and adjusting the amount of discharged materials according to the slag splashing effect score.
Further, according to a preset score evaluation rule, calculating a slag splashing effect score, which specifically comprises the following steps: the maximum ranges of the slag starting time and the holding time after slag starting are divided into a plurality of scoring areas respectively, the scoring areas are correspondingly set for scoring, the slag fluidity index during slag dumping is divided into different grades, the different grades correspond to different scoring, and the average value of the corresponding scoring of the slag starting time, the holding time after slag starting and the slag fluidity index during slag dumping is calculated to be the slag splashing effect scoring.
The invention discloses a control system for automatic slag splashing of a converter, which comprises a secondary machine and a primary machine, wherein the secondary machine is used for obtaining a slag splashing mode according to the method and sending the corresponding slag splashing mode to the primary machine, and the primary machine is used for receiving a slag splashing operation instruction and carrying out slag splashing control according to the corresponding slag splashing mode.
The invention has at least the following beneficial effects:
the invention provides a method for automatically judging the amount of slag splashing seasonings, which can automatically give the amount of the seasonings so as to adjust the weight of the slag splashing seasonings and avoid the blindness of manual judgment;
according to the invention, parameters of 3 slag splashing modes (furnace bottom rising, furnace bottom maintaining and furnace bottom lowering) are preset in a converter steelmaking model (second level), the slag splashing mode adaptive to the furnace condition is automatically sent to the HMI picture of the first level machine of the converter according to the current furnace condition, and an operator clicks one-key slag splashing on the HMI picture of the first level machine, so that one-key slag splashing operation can be realized, the operation of the operator is simplified, the labor intensity of the operator is reduced, and the slag splashing effect is improved. And the parameters of the invention are modified in the steel-making model (secondary), so that a manager can complete the modification of the parameters in an office, the influence on the operation of an operator is reduced, and the parameters can be modified according to the requirements of the furnace condition to achieve the best slag splashing effect.
The invention is beneficial to standardized operation, avoids the furnace bottom from being flushed by high-pressure nitrogen, slows down the erosion of the furnace lining, reduces the production cost and can achieve better slag splashing effect.
The slag splashing effect evaluation is given out by the invention, so that the slag splashing effect is ensured.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flowchart of a control method for automatic slag splashing of a converter according to an embodiment of the present invention;
fig. 2 is a schematic view of a one-key slag splashing model picture provided in the embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
After tapping of the converter is finished, the thin slag with good fluidity is adjusted into the slag with proper fluidity by adding the thick slag material and cooling the nitrogen, the slag with proper fluidity is impacted and adhered to the furnace wall through the high-pressure nitrogen, and the slag adhered to the furnace wall is cooled to form a protective layer to slow down direct scouring of waste steel and high-temperature molten steel on furnace lining bricks, so that the function of protecting the furnace lining is achieved.
According to the invention, parameters of 3 slag splashing modes (furnace bottom rising, furnace bottom maintaining and furnace bottom lowering) are preset in a converter steelmaking model (second level), the slag splashing mode adaptive to the furnace condition is automatically sent to the HMI picture of the first level machine of the converter according to the current furnace condition, and an operator clicks one-key slag splashing on the HMI picture of the first level machine, so that one-key slag splashing operation can be realized, the operation of the operator is simplified, and the slag splashing effect is improved.
And giving a reference weight of the seasonings according to the weight of the slag, blowing-out free oxygen, blowing-out temperature and the condition of the slag (video monitoring and judging) in the tapping process.
And after slag splashing is finished, evaluating slag splashing effect according to monitoring of slag splashing process and slag pouring.
Example one
Referring to fig. 1, an embodiment of the present invention provides a method for controlling automatic slag splashing of a converter, including the following steps:
the automatic slag splashing mode that this stove slag splashing needs to be taken of judging specifically includes: at the blowing end point of the converter and before tapping, measuring the liquid level of molten steel in the converter (namely the height of the liquid level of the molten steel), and comparing the liquid level with a first set value and a second set value;
when the liquid level is less than a first set value, the furnace bottom is thinned, and a furnace bottom expanding mode is adopted;
when the liquid level is greater than or equal to a first set value and less than or equal to a second set value, indicating that the furnace bottom is at a normal level, and adopting a furnace bottom maintenance mode;
when the liquid level is greater than a second set value, indicating that the furnace bottom becomes thick, and adopting a furnace bottom lowering mode;
automatically judging the seasoning amount during slag splashing;
automatic material preparation;
and receiving a slag splashing operation instruction (such as a one-key slag splashing instruction), and performing slag splashing control according to the determined slag splashing mode and the seasoning amount.
At the blowing end point of the converter and before tapping, TSO can be measured, and at the blowing end point of each converter, the liquid level, namely the height of the liquid level of steel can be measured when the TSO is measured. The measurement result model can be automatically written into a database every time, the liquid level can be measured by measuring the TSO before tapping at the blowing terminal point of each furnace, the average value of the liquid levels of the first few furnaces (the first 5 furnaces) is taken, the average value is compared with the first set value and the second set value, the slag splashing mode needing to be adopted by slag splashing of the furnace is automatically judged, and the accuracy of judgment by adopting the average value of the liquid levels of the first few furnaces is better.
The liquid level is the height of the steel liquid level, the thickness change of the furnace bottom is reflected, and the liquid level is low, which indicates that the furnace bottom descends and needs to be raised; the liquid level is high, which indicates that the furnace bottom rises and the liquid level needs to be lowered.
The values of the first set value and the second set value are set according to needs, and different steel plants need to set different parameters. In one embodiment, the first set point is 10cm and the second set point is 30cm.
Further, when the hearth rising mode is adopted, the seasonings are firstly put into the gun, when the gun is put down to a set gas opening position such as 2.4 meters, the gas is opened, and the high gun position operation is performed, namely, the slag splashing gun position is located in a preset high gun position range, such as 160-210 cm of the slag splashing gun position of one embodiment, N is supplied 2 Flow rate 48000-55000Nm 3 H is the ratio of the total weight of the catalyst to the total weight of the catalyst. The time interval from the seasoning to the gas opening is long, so that the slag can be cooled and viscosity can be adjusted, and the bottom of the furnace can be prevented from being washed by dilute slag.
When the furnace bottom maintenance mode is adopted, the gun is firstly put down, the gun is put down to a first set position as midway, the seasoning is started, the gun is continuously put down to a set gas-opening position as 2.4 meters, the gas is opened, the normal gun position operation is that the slag splashing gun position is positioned in the range of the preset middle gun position, and the seasoning is started when the gun is put down to the midway, such as 130-160 cm of the slag splashing gun position of one embodiment, N is supplied 2 Flow rates 52000-56000Nm 3 H is used as the reference value. The first set position is a 1/2 stroke position.
When the hearth lowering mode is adopted, the gun is firstly put down, the gun is put down to a second set position, the seasoning is started, when the second set position is higher than the set gas opening position, the gas is opened when the second set position is continuously put down to the set gas opening position, such as 2.4 meters, when the second set position is equal to the set gas opening position, the gas opening and the seasoning are almost synchronous, the low-gun position operation, namely the slag splashing gun position is positioned in the preset low-gun position range, such as 100-130 cm of the slag splashing gun position of one embodiment, N is supplied 2 Flow rate 52000-57000Nm 3 /h。
The second set position is lower than the first set position. The second set position may be higher than or equal to the set open gas position. The second setting position is a low position, and the close setting air opening position can be 5 meters, and can also be 2.4 meters and the like. The second setting position is generally not lower than the set gas opening position, so that the influence on the slag bonding of the gun head is avoided.
Generally, the oxygen lance descends from 20 meters to 2 meters, and the midway refers to the stroke from the lower part of the lance to a half, generally 12 meters; when the furnace bottom is expanded, firstly, seasonings are added, then, the gun is put down to the height of 2.4 meters, the gas is opened, the furnace slag is cooled for a long time, and the time for changing into sticky furnace slag is long; maintaining the furnace bottom, and when the gun is moved to half stroke, namely 12 meters, seasoning is added, and when the gun is moved to 2.4 meters, gas is boiled.
Further, the automatic condiment volume when judging the sediment that splashes specifically includes: the method comprises the steps of obtaining the weight of slag, the blowing stop temperature, the blowing stop oxygen content and the slag fluidity index, automatically judging the amount of seasonings (thick slag) during slag splashing according to the weight of the slag, the blowing stop temperature (sublance measurement), the blowing stop oxygen content (sublance measurement) and the slag fluidity index (slag condition and monitoring camera identification), automatically preparing materials according to the judged amount of seasonings, and adding corresponding amount of slag splashing materials according to the judged amount of seasonings during seasoning to improve the slag condition.
A scientific mode for judging the amount of the seasoning is provided, and unreasonable addition of slag is avoided. The invention provides a method for automatically judging the amount of slag splashing seasonings, and blindness of manual judgment is avoided.
Further, the method automatically judges the seasoning amount during slag splashing according to the weight of the slag, the blowing stop temperature, the blowing stop oxygen content and the slag fluidity index, and specifically comprises the following steps: the method comprises the steps of dividing the maximum range of the slag weight, the blowing stopping temperature and the blowing stopping oxygen content into a plurality of scoring intervals in advance, wherein each scoring interval corresponds to a set score, dividing the maximum range of the slag score into a plurality of scoring intervals, each scoring interval corresponds to a set seasoning amount, respectively obtaining the slag weight, the blowing stopping temperature, the blowing stopping oxygen content and a slag fluidity index, judging the scoring intervals where the slag weight, the blowing stopping temperature and the blowing stopping oxygen content are located, respectively obtaining scores corresponding to the slag weight, the blowing stopping temperature and the blowing stopping oxygen content, obtaining corresponding scores according to the slag fluidity index, obtaining the sum of the scores corresponding to the slag weight, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index as the slag score, and judging the scoring intervals where the slag score is located, and obtaining the corresponding seasoning amount.
In the converter blowing process, the weight of the slag is calculated according to the addition amount of the flux, and when the flux is added, the calculation is carried out once until the converter stops blowing.
Furthermore, a camera is used for shooting the slag surface in the converter during tapping, and a camera monitoring video is used for automatically identifying the slag fluidity index.
Further, the slag fluidity index is identified according to the slag caking condition, and is divided into different grades, and the different grades correspond to different scores.
The seasoning amount determining method of the present invention will be described below by taking an embodiment as an example, and table 1 shows a quantitative table of parameters affecting the seasoning amount.
TABLE 1
A camera is arranged on a platform behind the converter and is aligned with the slag surface in the converter during tapping, the fluidity of the slag is rated by automatic identification of a monitoring video of the camera, and a table 2 is a slag fluidity evaluation reference table.
TABLE 2
The scores of the various indexes related to the slag are added, the reference seasoning amount is given according to the scores, and the slag scores and the corresponding seasoning amounts are shown in a table 3.
TABLE 3
| Slag score | [0,4) | [4,8) | [8,12) | [12,16) | [16,20] |
| Amount of slag splashed | 0 | 500 | 1000 | 1500 | 2000 |
Further, the camera is used for shooting the slag surface in the converter during tapping, and the camera monitoring video is used for automatically identifying the slag fluidity index.
Further, the slag fluidity index is identified according to the slag caking condition, and is divided into different grades, and the different grades correspond to different scores.
Further, obtaining slag-forming time, holding time after slag forming and slag fluidity index during slag dumping, calculating slag splashing effect score according to a preset score evaluation rule, and feeding back and adjusting the amount of the lower furnace seasoning according to the slag splashing effect score. If the slag splashing score is low, which indicates that the slag splashing effect is not good, the 'slag splashing amount' needs to be adjusted, the parameter table of the seasoning amount, namely table 3, can be adjusted according to experience, for example, 500kg corresponding to 4-8 points is adjusted to 600kg, the 'slag splashing gun position' can be adjusted according to experience, and the gun position in the slag splashing process is modified, wherein the adjustment is to manually adjust the parameter tables.
Further, according to a preset score evaluation rule, calculating a slag splashing effect score, which specifically comprises the following steps: the maximum ranges of the slag starting time and the holding time after slag starting are divided into a plurality of scoring areas respectively, the scoring areas are correspondingly set for scoring, the slag fluidity index during slag dumping is divided into different grades, the different grades correspond to different scoring, and the average value of the corresponding scoring of the slag starting time, the holding time after slag starting and the slag fluidity index during slag dumping is calculated to be the slag splashing effect scoring.
When the furnace mouth has more dense slag flying out, the slag is defined as slagging. The invention utilizes the camera monitoring video in front of the furnace to monitor the slag-forming time, and utilizes the camera monitoring video of the slag passage under the furnace to monitor the fluidity index of the slag during slag pouring (the fluidity index of the slag is obtained by image recognition, analysis and rating). The method can automatically define the quality of the slag splashing effect through the slag removing time, the holding time after slag removing and the slag fluidity index.
According to the invention, a score evaluation rule is set according to actual conditions, and a comprehensive slag splashing effect score is calculated according to the rule, wherein the table 4 is a slag splashing effect evaluation table provided by a specific embodiment.
TABLE 4
And adding the slag fluidity score to the score, and taking the average value to obtain the evaluation score of the slag splashing of the current heat. In the deslagging process, the slag condition can be clearly monitored by the monitoring video of the slag discharging channel, the slag splashing effect is evaluated according to the slag condition, and the table 5 is the slag flow index during deslagging.
TABLE 5
If the slag splashing score is low, the slag score and the corresponding seasoning amount in the table 3 can be adjusted according to the slag splashing score and the actual effect, so as to achieve the purpose of improving the slag splashing effect.
Example two
The embodiment of the invention discloses a control system for automatic slag splashing of a converter, which comprises a secondary machine and a primary machine, wherein the secondary machine is used for obtaining slag splashing modes (time, gun position and flow, see the figure of 'one-key slag splashing' in the following drawing) according to the method in the first embodiment and sending the slag splashing modes to the primary machine, and the primary machine is used for receiving slag splashing operation instructions and carrying out slag splashing control according to the corresponding slag splashing modes and the corresponding seasoning amount, and comprises automatic gun position control, automatic slag splashing flow control and the like. In the slag splashing process, the gun position and the flow are automatically controlled at different times.
In the invention, in a converter steelmaking model (second level), the parameters of 3 slag splashing modes (furnace bottom rising, furnace bottom maintaining and furnace bottom lowering)' slag splashing time(s), gun position height (cm) and slag splashing flow (Nm) 3 And/h) is set in converter steelmaking model software (second-level), a slag splashing mode adaptive to the converter condition is automatically sent to a converter first-level machine HMI picture according to the current converter condition, and an operator clicks one-key slag splashing on the first-level machine HMI picture, so that one-key slag splashing operation can be realized, the operation of the operator is simplified, and the slag splashing effect is improved. If the slag splashing parameters need to be modified, an engineer or a professional can modify and store the slag splashing parameters in the steel-making model (secondary) according to actual requirements, and an operator only needs to click one key of slag splashing on the primary machine.
When tapping begins, the secondary receives a tapping beginning signal, automatically matches the measured liquid level mean value of the first furnaces (such as the first 5 furnaces) according to the liquid level-slag splashing mode, namely, determines the slag splashing mode needing to be adopted by slag splashing of the furnace according to the measured liquid level mean value of the first furnaces (such as the first 5 furnaces), automatically determines which slag splashing mode is needed, and sends which mode to the HMI picture of the primary machine. If the operator needs to change the slag splashing mode, before slag splashing, the operator can click a sending button corresponding to the needed slag splashing mode in a two-stage one-key slag splashing picture, and then the slag splashing mode can be adjusted. Referring to fig. 2, the furnace bottom expansion mode sets the gun height and the flow rate thereof at different times; maintaining the furnace bottom mode, and setting the gun height and the flow rate at different time; the furnace bottom lowering mode sets the gun height and its flow rate at different times. The invention can adjust the parameters in the mode according to the actual situation.
At present heat, when tapping begins, the steelmaking model is automatic to be sent the slag splashing mode to the primary machine, and the primary machine receives the parameter of second grade model, writes into the primary machine after confirming automatically, hits "a key slag splashing" on the primary machine and can accomplish the slag splashing operation, and the process contains automatic rifle down, presses the operation of setting for rifle height, flow automatically, and the slag splashing ends, reaches the time delay (can set up) after, carries the rifle automatically, the slag splashing is ended.
And a furnace mouth molten steel surface monitoring camera is additionally arranged behind the furnace, or a converter furnace mouth monitoring camera in an automatic tapping system is utilized. The slag fluidity index was evaluated programmatically, and the slag score was evaluated in terms of the slag fluidity index, the amount of slag (t), the temperature (. Degree. C.), and the oxygen content (ppm).
And according to the slag score, giving a seasoning reference value.
The corresponding programming is carried out in the primary machine, so that the parameters in the secondary machine can be completely sent to the primary machine, and the picture can be kept approximately the same.
The invention adds a 'one-key slag splashing' function picture in converter steelmaking model software (second level), presets parameters (slag splashing time, slag splashing gun height and nitrogen flow) of 3 common slag splashing modes (furnace bottom rising, furnace bottom maintaining and furnace bottom lowering), automatically sends the slag splashing mode adaptive to the furnace condition to a first-level machine HMI picture of the converter according to the current furnace condition (liquid level), and an operator clicks 'one-key slag splashing' on the first-level machine HMI picture to realize one-key slag splashing operation, thereby replacing a manual slag splashing mode.
And (3) installing a camera behind the converter (or utilizing the existing camera), analyzing the slag surface (dry and thin) condition according to a monitoring video provided by the camera in the converter tapping process, grading the slag condition into 5 grades by combining the weight of the slag, the blowing-out free oxygen and the blowing-out temperature, and giving the seasoning amount during slag splashing according to the grading.
The whole process realizes intelligent judgment of the slag splashing seasoning amount, one-key automatic slag splashing and automatic slag splashing effect evaluation, and the slag splashing effect evaluation method is helpful for improving slag splashing and improving economic furnace life.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (10)
1. A control method for automatic slag splashing of a converter is characterized by comprising the following steps: the method comprises the following steps:
the automatic slag splashing mode that needs to be adopted for determining slag splashing of the furnace comprises the following steps: at the blowing end point of the converter and before tapping, measuring the liquid level of the molten steel in the converter, and comparing the liquid level with a first set value and a second set value;
when the liquid level is less than a first set value, adopting a furnace bottom expanding mode;
when the liquid level is greater than or equal to a first set value and less than or equal to a second set value, adopting a furnace bottom maintenance mode;
when the liquid level is greater than a second set value, a furnace bottom lowering mode is adopted;
automatically judging the seasoning amount during slag splashing;
and receiving a slag splashing operation instruction, and performing slag splashing control according to the judged slag splashing mode and the seasoning amount.
2. The method for controlling automatic slag splashing of a converter according to claim 1, characterized in that: when the hearth rising mode is adopted, firstly, seasonings are put into the gun, when the gun is put to a set gas-opening position, gas is opened, and the slag splashing gun position is located in a preset high gun position range;
when the furnace bottom maintenance mode is adopted, firstly, the gun is put down to a first set position, the seasoning is started, when the gun is put down to a set gas-opening position, the gas is opened, and the slag splashing gun position is located in the range of a preset middle gun position; the first set position is a 1/2 stroke position,
when the furnace bottom lowering mode is adopted, firstly, the gun is put down to a second set position, the seasoning is started, when the second set position is higher than the set gas opening position, the gas is opened when the gun is continuously put down to the set gas opening position, when the second set position is equal to the set gas opening position, the gas opening and the seasoning are started synchronously, and the slag splashing gun position is positioned in a preset low gun position range;
the second set position is lower than the first set position; the second set position is adjacent to the set open position.
3. The method for controlling automatic slag splashing of the converter according to claim 1 or 2, characterized in that: when the hearth rising mode is adopted, the slag splashing gun position is 160-210 cm, and the air supply flow is 48000-55000Nm 3 /h；
When the mode of maintaining the furnace bottom is adopted, the slag splashing lance position is 130-160 cm, and the air supply flow is 52000-56000Nm 3 /h；
When the mode of lowering the furnace bottom is adopted, the slag splashing gun position is 100-130 cm, and the air supply flow is 52000-57000Nm 3 /h。
4. The method for controlling automatic slag splashing of a converter according to claim 1, characterized in that: the seasoning amount during automatic slag splashing judgment specifically comprises: acquiring the weight of the slag, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index, automatically judging the seasoning amount during slag splashing according to the weight of the slag, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index, and adding corresponding amount of slag splashing materials according to the judged seasoning amount during seasoning to improve the slag condition.
5. The method for controlling automatic slag splashing of a converter according to claim 4, characterized in that: the method comprises the following steps of automatically judging the seasoning amount during slag splashing according to the weight of the slag, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index, and specifically comprises the following steps: the method comprises the steps of dividing the maximum range of the slag weight, the blowing stopping temperature and the blowing stopping oxygen content into a plurality of scoring intervals in advance, wherein each scoring interval corresponds to a set score, dividing the maximum range of the slag score into a plurality of scoring intervals, each scoring interval corresponds to a set seasoning amount, judging the scoring interval where the obtained slag weight, the blowing stopping temperature and the blowing stopping oxygen content are located, respectively obtaining scores corresponding to the slag weight, the blowing stopping temperature and the blowing stopping oxygen content, obtaining a corresponding score according to an obtained slag fluidity index, wherein the sum of the scores corresponding to the slag weight, the blowing stopping temperature, the blowing stopping oxygen content and the slag fluidity index is the slag score, and judging the scoring interval where the slag score is located, so that the corresponding seasoning amount can be obtained.
6. The method for controlling automatic slag splashing of the converter according to claim 1, characterized in that: the camera is used for shooting the slag surface in the converter during tapping, and the camera monitoring video is used for automatically identifying the slag fluidity index.
7. The method for controlling automatic slag splashing of a converter according to claim 6, characterized in that: and identifying the slag fluidity index according to the slag caking condition, and dividing the slag fluidity index into different grades, wherein the different grades correspond to different scores.
8. The method for controlling automatic slag splashing of a converter according to claim 1, characterized in that: also comprises the following steps: obtaining slag-forming time, holding time after slag forming and slag fluidity index during slag dumping, calculating slag splashing effect score according to a preset score evaluation rule, and feeding back and adjusting the amount of discharged materials according to the slag splashing effect score.
9. The method for controlling automatic slag splashing of the converter according to claim 1, characterized in that: calculating a slag splashing effect score according to a preset score evaluation rule, and specifically comprises the following steps: the maximum ranges of the slag starting time and the holding time after slag starting are divided into a plurality of scoring areas respectively, the scoring areas are correspondingly set for scoring, the slag fluidity index during slag dumping is divided into different grades, the different grades correspond to different scoring, and the average value of the corresponding scoring of the slag starting time, the holding time after slag starting and the slag fluidity index during slag dumping is calculated to be the slag splashing effect scoring.
10. The control system for automatic slag splashing of the converter is characterized in that: the slag splashing control method comprises a secondary machine and a primary machine, wherein the secondary machine is used for obtaining slag splashing modes according to the method of any one of claims 1 to 9 and sending the corresponding slag splashing modes to the primary machine, and the primary machine is used for receiving slag splashing operation instructions and carrying out slag splashing control according to the corresponding slag splashing modes.
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| CN202211357497.3A CN115896387A (en) | 2022-11-01 | 2022-11-01 | Control method and system for automatic slag splashing of converter |
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| CN202211357497.3A CN115896387A (en) | 2022-11-01 | 2022-11-01 | Control method and system for automatic slag splashing of converter |
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