CN117737338A - Method for predicting liquid level of converter molten pool - Google Patents
Method for predicting liquid level of converter molten pool Download PDFInfo
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- CN117737338A CN117737338A CN202311721505.2A CN202311721505A CN117737338A CN 117737338 A CN117737338 A CN 117737338A CN 202311721505 A CN202311721505 A CN 202311721505A CN 117737338 A CN117737338 A CN 117737338A
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- 239000007788 liquid Substances 0.000 title claims abstract description 106
- 238000000034 method Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 166
- 239000010959 steel Substances 0.000 claims abstract description 166
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 11
- 239000001301 oxygen Substances 0.000 claims abstract description 11
- 239000007769 metal material Substances 0.000 claims abstract description 3
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 45
- 229910052742 iron Inorganic materials 0.000 claims description 21
- 239000002184 metal Substances 0.000 claims description 14
- 229910052751 metal Inorganic materials 0.000 claims description 14
- 239000000523 sample Substances 0.000 claims description 5
- 239000011449 brick Substances 0.000 claims description 4
- 238000005259 measurement Methods 0.000 claims description 4
- 239000002436 steel type Substances 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims 3
- 238000006243 chemical reaction Methods 0.000 abstract description 3
- 238000009628 steelmaking Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000000779 smoke Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a method for predicting the liquid level of a converter molten pool, which comprises a furnace body, an oxygen lance and an operation panel, wherein the distance between the liquid level of molten steel and the bottom of the furnace is molten steel liquid level depth, and the distance between the liquid level of molten steel and the surface level is molten steel liquid level; the operation panel comprises a theoretical molten steel amount calculation and display module, a predicted molten steel liquid level height calculation and display module, a reference molten steel liquid level height recording module and a reference molten steel amount recording module, wherein the actual molten steel liquid level height display module is used for displaying actual molten steel liquid level height data, the reference molten steel liquid level height recording module is used for recording reference molten steel liquid level height data, and the reference molten steel amount recording module is used for recording reference molten steel amount data according to the actual molten steel amount of the metal material actually loaded into the converter. The molten pool liquid level of each furnace is corrected by calculating the size and the loading quantity of the hearth, the calculation error is reduced by the system conversion, and the calculation result is quick and accurate, so that the gun position control is more accurate.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to a method for predicting the liquid level of a converter molten pool.
Background
In the converter steelmaking process, the lance position of the oxygen lance is a very important parameter, and is directly related to decarburization, slagging and heating and splash and return drying in the steelmaking process. Once the control of the lance position of the oxygen lance is unreasonable, the problems of the increase of the steelmaking cost and the influence of smoke on environmental protection are caused, so that the accurate control of the lance position of the oxygen lance is ensured, and the steelmaking process can be stably carried out. The lance position refers to the distance from the outlet end of the lance nozzle to the liquid level of the stationary metal molten pool, and in actual production, the fluctuation of the loading amount of the converter, the fluctuation of the furnace bottom height and the change of the furnace hearth size in the front and rear stages of the furnace service all cause different liquid levels of the metal molten pools of each furnace so as to influence the lance position control, so that the accurate control of the lance position of the lance is ensured, and the liquid level of the metal molten pool of the converter is accurately measured or predicted at first.
At present, the control modes of the steel converter steelmaking production enterprises on the liquid level of a converter molten pool mainly comprise two modes: firstly, adopting manual experience to estimate the liquid level of a molten pool according to the total loading of a converter, wherein the method is most common, but has larger manual estimation error and low precision; the other method is to actually measure the liquid level of the converter molten pool through a converter sublance system or other liquid level measuring devices, and the method is accurate in measurement, but each furnace measurement is time-consuming, affects the efficiency and increases the cost.
Disclosure of Invention
Aiming at the defects of the prior art, the invention aims to provide a prediction model and a method capable of accurately calculating the liquid level of a molten pool of a converter, the liquid level of the molten pool of each furnace is corrected by calculating the size and the loading quantity of a hearth, and the calculation error is reduced by system conversion, so that the gun position control is more accurate, and the control of the smelting process is facilitated, and the production accidents such as splash and the like are reduced. The invention does not need to additionally increase detection equipment, and is simple and easy to operate.
The invention provides a method for predicting the liquid level of a converter molten pool, which is realized by the following technical scheme:
the model for predicting the liquid level of the converter molten pool comprises a furnace body and an operation panel, wherein the bottom of the interior of the furnace body is a furnace bottom, molten steel is filled in the interior of the furnace body, the thickness of the furnace bottom is the residual thickness of refractory bricks on the furnace bottom, the thickness of the furnace wall is the residual thickness of refractory bricks on the furnace wall, the distance between the liquid level of the molten steel and the furnace bottom is the liquid level depth of the molten steel, and the distance between the liquid level of the molten steel and the surface level is the liquid level of the molten steel;
the operation panel comprises a theoretical molten steel amount calculation and display module, a predicted molten steel liquid level calculation and display module, a reference molten steel liquid level recording module and a reference molten steel amount recording module, wherein the theoretical molten steel amount calculation module is used for calculating the theoretical molten steel amount according to the actual loading metal of the converter, the actual molten steel liquid level display module is used for displaying the actual molten steel liquid level data, the reference molten steel liquid level recording module is used for recording the reference molten steel liquid level data, and the reference molten steel amount recording module is used for recording the reference molten steel amount data.
Further, the converter molten pool liquid level prediction model and the method are as follows:
(1) The theoretical molten steel amount calculating module is as follows:
wherein: w (W) steel Is theoretical molten steel amount (kg); w (W) iron Is the actual charged molten iron (kg); beta iron The metal yield (%) of molten iron, i is the scrap steel type, and m scrap steels are used; w (W) i The amount (kg) of the i-th scrap steel; psi phi type i The metal yield (%) of the ith scrap, W ore The amount (kg) of iron ore; delta ore Metal yield (%) for iron ore.
(2) The predicted molten steel liquid level height calculation module is used for:
H Pre ＝H Base +(W steel -W base )·A i
wherein: h Pre To predict the molten steel level (cm); h Base Is the latest reference molten steel liquid level (cm); w (W) base Is the latest reference molten steel amount (kg); a is that i Is the height system of molten steel level per tonNumber (cm/kg).
The further improvement is that: the H is Base The latest reference molten steel liquid level can be obtained by measuring the residual thickness of the refractory bricks of the converter by using a converter thickness gauge, introducing the measured data into automatic modeling, and calculating to obtain the molten steel quantity W in the converter base The liquid level of molten steel at the latest reference molten steel amount is the same as the A i The height coefficient of the molten steel level of ton can be calculated according to the size of the hearth.
The further improvement is that: the H is Base The latest reference molten steel liquid level height can also be obtained by using a sublance liquid level probe or other liquid level measuring devices, and the molten steel quantity in the furnace when the sublance liquid level probe or other liquid level measuring devices measure is the W base The latest reference molten steel amount, at the same time, the A i The ton molten steel level height coefficient can be calculated by regression according to the historical reference molten steel level height and the reference molten steel amount. In the specific embodiment of the invention, a sublance liquid level probe is used.
The further improvement is that: the invention does not need to measure every furnace, and only needs to measure and correct at regular intervals.
As described above, the converter molten pool liquid level prediction model and method of the invention have the following beneficial effects:
according to the converter molten pool liquid level prediction method provided by the invention, the molten pool liquid level of each furnace is corrected by calculating the size and the loading amount of the hearth, and the calculation error is reduced by system conversion, so that more accurate gun position control is achieved, and production accidents such as splash and the like are favorably controlled in the smelting process. The invention does not need to additionally increase detection equipment, utilizes the original converter thickness gauge or sublance, only needs to periodically measure and correct once, has quick and accurate calculation result and strong operability, can effectively save steelmaking cost, reduces the influence of human factors, can obtain obvious economic benefit, improves production efficiency, and is easy to popularize.
Drawings
FIG. 1 is a front view of the present invention;
FIG. 2 is a schematic view of a model for predicting the liquid level of a molten bath of a converter according to the present invention.
Wherein: 1. a furnace body; 2. an oxygen lance; 3. a furnace bottom; 4. molten steel; 5. liquid level depth of molten steel; 6. gun position height; 7. molten steel level height; 8. a surface level; 9. a reference molten steel liquid level height input module; 10. a reference molten steel quantity input module; 11. a theoretical molten steel amount calculating module and a display module; 12. and the calculating and displaying module predicts the liquid level height of the molten steel.
Detailed Description
The present invention will be further described in detail with reference to the following examples, which are only for the purpose of illustrating the invention and are not to be construed as limiting the scope of the invention.
Example 1:
according to fig. 1 and 2, this embodiment provides a model and a method for predicting a molten pool level height of a converter, including a furnace body 1, an oxygen lance 2 and an operation panel, wherein an output end of the oxygen lance 2 extends into the furnace body 1, a bottom of the furnace body 1 is a furnace bottom 3, molten steel 4 is filled in the furnace body 1, a distance between a liquid level of the molten steel 4 and the furnace bottom 3 is a molten steel liquid level depth 5, a distance between an output end of the oxygen lance 2 and a liquid level of the molten steel 4 is a lance level height 6, and a distance between a liquid level of the molten steel 4 and a surface level 8 is a molten steel liquid level height 7;
the operation panel comprises a theoretical molten steel amount calculation module and a display module 11, a predicted molten steel liquid level calculation and display module 12, a reference molten steel liquid level recording module 9 and a reference molten steel amount recording module 10, wherein the theoretical molten steel amount calculation module and the display module 11 are used for calculating the theoretical molten steel amount obtained according to the actual loading of the converter into the metal material, the predicted molten steel liquid level calculation and display module 12 is used for displaying and calculating data of the predicted molten steel liquid level, the reference molten steel liquid level recording module 9 is used for recording data of the reference molten steel liquid level, and the reference molten steel amount recording module 10 is used for recording data of the reference molten steel amount.
When the device is used, firstly, according to the reference molten steel liquid level height and the reference molten steel amount of a periodic measurement heat, the reference molten steel liquid level height is recorded into a reference molten steel liquid level height recording module 9 and the reference molten steel amount is recorded into a reference molten steel amount recording module 10 in an operation panel; secondly, after the addition of scrap steel in each furnace is finished, automatically reading the amount of molten iron, the amount of scrap steel and the amount of theoretical molten steel obtained by ore calculation by a program, and automatically issuing the amount of theoretical molten steel to a theoretical molten steel calculation module and a display module 11; then, the tap water level 7 is calculated using the theoretical molten steel amount 4 for each furnace.
Example 2:
according to the optimization method, the liquid level of a converter molten pool is calculated by taking a certain steel mill 350t converter as an example, and the concrete steps are as follows:
first, when the liquid level of molten steel is 1037cm by a sublance liquid level probe at the latest one heat in a shift and the molten steel amount of steel discharged before alloy is not added in the heat is 360.4 tons, the latest reference liquid level of molten steel is recorded into a reference liquid level recording module 9 and the latest reference liquid level of molten steel is recorded into a 360.4 ton reference liquid level recording module 10 in an operation panel.
Next, after the end of adding scrap for each furnace, the program automatically reads in the amount of molten iron, the amount of scrap, and the amount of ore charged as shown in table 1 below:
TABLE 1 current furnace metal charge data
According to the theoretical molten steel amount calculation module:
wherein: w (W) steel Is theoretical molten steel amount (kg); w (W) iron Is the actual charged molten iron (kg); beta iron The metal yield (%) of molten iron, i is the scrap steel type, and m scrap steels are used; w (W) i The amount (kg) of the i-th scrap steel; psi phi type i The metal yield (%) of the ith scrap, W ore The amount (kg) of iron ore; delta ore Metal yield (%) for iron ore.
Calculating to obtain the theoretical molten steel amount of 364.25 tons of the current furnace, and automatically issuing the theoretical molten steel amount to the theoretical molten steel amount calculating module and the display module 11;
then, according to the predicted molten steel liquid level calculating module:
H Pre ＝H Base +(W steel -W base )·A i
wherein: h Pre To predict the molten steel level (cm); h Base Is the latest reference molten steel liquid level (cm); w (W) base Is the latest reference molten steel amount (kg); a is that i The height coefficient (cm/kg) of the molten steel surface per ton is 0.00045cm/kg in this example.
The liquid level 7 of the molten steel was 1038.7cm.
Claims (4)
1. A converter molten pool liquid level prediction method is characterized in that: the device comprises a furnace body 1, an oxygen lance 2 and an operation panel, wherein the output end of the oxygen lance 2 extends into the furnace body 1, the bottom of the furnace body 1 is a furnace bottom 3, molten steel 4 is arranged in the furnace body 1, the distance between the liquid level of the molten steel 4 and the furnace bottom 3 is molten steel liquid level depth 5, the distance between the output end of the oxygen lance 2 and the liquid level of the molten steel 4 is gun position height 6, and the distance between the liquid level of the molten steel 4 and the ground surface level 8 is molten steel liquid level height 7; the operation panel comprises a theoretical molten steel amount calculation module and display module 11, a predicted molten steel liquid level calculation and display module 12, a reference molten steel liquid level recording module 9 and a reference molten steel amount recording module 10, wherein the theoretical molten steel amount calculation module and display module 11 are used for calculating the theoretical molten steel amount obtained according to the actual loading of the metal material into the converter, the predicted molten steel liquid level calculation and display module 12 is used for displaying and calculating data of the predicted molten steel liquid level, the reference molten steel liquid level recording module 9 is used for recording data of the reference molten steel liquid level, and the reference molten steel amount recording module 10 is used for recording data of the reference molten steel amount;
the prediction method comprises the following steps:
(1) According to the reference molten steel liquid level height and the reference molten steel amount of the periodic measurement heat, in an operation panel, recording the reference molten steel liquid level height into a reference molten steel liquid level height recording module 9 and the reference molten steel amount into a reference molten steel amount recording module 10;
(2) After the addition of scrap steel in each furnace is finished, automatically reading the amount of iron and steel charged, the amount of scrap steel and the amount of theoretical steel and water obtained by ore calculation by a program, and automatically issuing the theoretical steel and water amount to a theoretical steel water amount calculation module and a display module;
(3) Calculating the liquid level height of molten steel by using the theoretical molten steel of each furnace;
theoretical molten steel amount calculation module:
wherein: w (W) steel Is theoretical molten steel amount (kg); w (W) iron Is the actual charged molten iron (kg); beta iron The metal yield (%) of molten iron, i is the scrap steel type, and m scrap steels are used; w (W) i The amount (kg) of the i-th scrap steel; psi phi type i The metal yield (%) of the ith scrap, W ore The amount (kg) of iron ore; delta ore Metal yield (%) for iron ore;
a predicted molten steel level calculating module:
H Pre ＝H Base +(W steel -W base )·A i
wherein: h Pre To predict the molten steel level (cm); h Base Is the latest reference molten steel liquid level (cm); w (W) base Is the latest reference molten steel amount (kg); a is that i The height coefficient (cm/kg) of the molten steel surface per ton.
2. The method for predicting the liquid level of a molten bath of a converter according to claim 1, wherein: the latest reference molten steel liquid level is obtained by measuring the residual thickness of a refractory brick of a converter by using a converter thickness gauge, introducing the measured data into automatic modeling, calculating to obtain the molten steel liquid level when the molten steel quantity in the converter is the latest reference molten steel quantity, and calculating the coefficient of the molten steel liquid level per ton according to the size of a hearth.
3. The method for predicting the liquid level of a molten bath of a converter according to claim 1, wherein: the latest reference molten steel liquid level is obtained by using a liquid level measuring device, and the ton molten steel liquid level coefficient is obtained by regression calculation according to the historical reference molten steel liquid level and the reference molten steel amount.
4. A converter molten bath level prediction method according to claim 3, characterized by: the liquid level measuring device is a sublance liquid level probe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311721505.2A CN117737338A (en) | 2023-12-14 | 2023-12-14 | Method for predicting liquid level of converter molten pool |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311721505.2A CN117737338A (en) | 2023-12-14 | 2023-12-14 | Method for predicting liquid level of converter molten pool |
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| CN117737338A true CN117737338A (en) | 2024-03-22 |
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| CN202311721505.2A Pending CN117737338A (en) | 2023-12-14 | 2023-12-14 | Method for predicting liquid level of converter molten pool |
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| Country | Link |
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- 2023-12-14 CN CN202311721505.2A patent/CN117737338A/en active Pending
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