CN115287392A - Quick maintenance method for converter slag pouring surface and furnace bottom lining - Google Patents
Quick maintenance method for converter slag pouring surface and furnace bottom lining Download PDFInfo
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- CN115287392A CN115287392A CN202210956732.2A CN202210956732A CN115287392A CN 115287392 A CN115287392 A CN 115287392A CN 202210956732 A CN202210956732 A CN 202210956732A CN 115287392 A CN115287392 A CN 115287392A
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- 239000002893 slag Substances 0.000 title claims abstract description 220
- 238000012423 maintenance Methods 0.000 title claims abstract description 64
- 238000000034 method Methods 0.000 title claims abstract description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 70
- 229910052742 iron Inorganic materials 0.000 claims abstract description 30
- 230000003628 erosive effect Effects 0.000 claims abstract description 27
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical group [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 26
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 26
- 239000001301 oxygen Substances 0.000 claims abstract description 26
- 238000010079 rubber tapping Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 9
- 229910000831 Steel Inorganic materials 0.000 claims description 27
- 239000010959 steel Substances 0.000 claims description 27
- 239000002699 waste material Substances 0.000 claims description 11
- 238000012790 confirmation Methods 0.000 claims description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910052799 carbon Inorganic materials 0.000 claims description 4
- 230000014759 maintenance of location Effects 0.000 claims description 4
- 239000012463 white pigment Substances 0.000 claims 2
- 239000003607 modifier Substances 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 19
- 238000004519 manufacturing process Methods 0.000 description 16
- 230000000694 effects Effects 0.000 description 8
- 230000006872 improvement Effects 0.000 description 8
- 238000003825 pressing Methods 0.000 description 7
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 6
- 229910000514 dolomite Inorganic materials 0.000 description 6
- 239000010459 dolomite Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 230000002411 adverse Effects 0.000 description 5
- 238000003912 environmental pollution Methods 0.000 description 5
- 238000005245 sintering Methods 0.000 description 5
- 230000009471 action Effects 0.000 description 4
- 229910052500 inorganic mineral Inorganic materials 0.000 description 4
- 239000011707 mineral Substances 0.000 description 4
- 238000009628 steelmaking Methods 0.000 description 4
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000000395 magnesium oxide Substances 0.000 description 3
- 238000005259 measurement Methods 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- 238000003723 Smelting Methods 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005260 corrosion Methods 0.000 description 2
- 230000029087 digestion Effects 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 239000011819 refractory material Substances 0.000 description 2
- 238000005299 abrasion Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000011449 brick Substances 0.000 description 1
- 125000005587 carbonate group Chemical group 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000000354 decomposition reaction Methods 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/44—Refractory linings
- C21C5/441—Equipment used for making or repairing linings
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention provides a converter slag pouring surface and furnace bottom lining rapid maintenance method, which comprises the following steps: measuring the thickness of the converter, and determining the erosion condition of the slag dumping surface and the erosion condition of the furnace bottom; determining a maintenance mode according to the erosion condition of the slag dumping surface and the erosion condition of the furnace bottom; the maintenance mode includes: a slag surface maintenance mode and a furnace bottom maintenance mode; in the slag surface maintenance mode, the whole slag amount is reserved after tapping, and the converter is shaken to different angles to maintain different positions of the slag surface; the slag covers the iron chips; in a furnace bottom maintenance mode, firstly deslagging after tapping, reserving 8-10 t of furnace slag, shaking the furnace to 60 ℃, adding scrap iron to press cakes, then shaking the converter to-55 ℃, shaking the furnace to +45 ℃, continuing to shake the furnace to-20 ℃, shaking the furnace to a zero position, and standing and cooling the converter for 2-5 minutes; and in the maintenance mode, different slag splashing models are set according to different terminal oxygen. Effectively improves the operating rate of the converter and does not need the investment of the cost of repairing materials.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a method for quickly maintaining converter slag pouring surfaces and a converter bottom lining.
Background
The converter lining is mainly built by magnesia refractory materials and consists of a heat insulation layer, a permanent layer and a working layer.
Converter smelting is a series of physical and chemical reaction processes under high temperature conditions, and a furnace lining is corroded by a series of strong mechanical, physical and chemical actions in the processes. The main mechanism is as follows: mechanical shock erosion. The operations of adding scrap steel, adding molten iron and the like can directly face the slag surface furnace lining of the converter, and strong impact, abrasion and scouring are generated on the slag surface furnace lining, which is also a main factor for the corrosion of the refractory material of the furnace lining; in addition, under high temperature and severe conditions, the chemical erosion of the furnace lining by the slag and furnace gas and the temperature difference change in the furnace during water cut and tapping can damage the furnace lining. In response to such a situation, a lot of time is required for maintenance to avoid the influence of the continuous deterioration of the furnace condition on the safe production. The converter lining erosion at the later stage of the furnace age has the characteristic of unbalance, and the most serious erosion part is the slag pouring surface according to the lining erosion principle, because the slag pouring surface is opposite to other parts of the lining, the slag pouring surface is not only subjected to the chemical erosion of slag on the lining, the influence of uneven cooling and heating on the lining, the brick peeling of the furnace lining, the scouring of molten steel, slag and furnace gas on the lining, but also subjected to mechanical impact during waste steel adding and molten iron scouring during molten iron adding, so that the slag pouring surface is an important part influencing the service life and the use and maintenance cost of the converter, and is also a key maintenance part of the lining.
In summary, the following problems exist in the prior art: how to quickly maintain the converter slag pouring surface and the converter bottom lining.
Disclosure of Invention
The invention aims to solve the problem of how to quickly maintain the converter slag pouring surface and the furnace bottom lining.
Therefore, the embodiment of the invention provides a method for quickly maintaining a converter slag pouring surface and a converter bottom lining, which comprises the following steps:
measuring the thickness of the converter, and determining the erosion condition of the slag dumping surface and the erosion condition of the furnace bottom;
determining a maintenance mode according to the slag dumping surface erosion condition and the furnace bottom erosion condition; the maintenance mode includes: a slag surface maintenance mode and a furnace bottom maintenance mode;
in the slag surface maintenance mode, the whole slag amount is reserved after tapping, and the converter is shaken to different angles to maintain different positions of the slag surface; after the iron chips are pressed into the furnace, the furnace body is quickly shaken to +90 degrees, so that the iron chips are completely covered by the slag;
in a furnace bottom maintenance mode, firstly deslagging after tapping, reserving 8-10 t of furnace slag, shaking the furnace to 60 ℃, adding scrap iron to press cakes, then shaking the converter to-55 ℃, shaking the furnace to +45 ℃, continuing to shake the furnace to-20 ℃, shaking the furnace to a zero position, and standing and cooling the converter for 2-5 minutes;
in the maintenance mode, different slag splashing models are set according to different terminal oxygen.
Specifically, in the slag surface maintenance mode, slag splashing protection is carried out without adding a slag adjusting agent, and slag is splashed onto the furnace body.
Specifically, in the furnace bottom maintenance mode, 50% of the total amount of the raw white is added 60 seconds after the start of slag splashing, and the remaining 50% of the raw white is added 180 seconds after the start of slag splashing.
Specifically, in the slag surface maintenance mode, the whole slag amount is reserved after tapping, the furnace is respectively shaken to 70 degrees, 60 degrees and 55 degrees, and maintenance is carried out on different positions of the slag surface; and (3) after the scrap iron press cake is put into the furnace by using a scrap steel bucket, shaking the furnace body to +90 degrees, and enabling the slag to completely cover the scrap iron press cake.
Specifically, slag pouring is performed after slag splashing is completed, and in the slag pouring, slag passes through a slag surface and covers a press cake at the slag surface.
Specifically, after deslagging, shaking the converter to a slag retention confirmation position, standing for 2-3 s, shaking the converter to +55 to +60 degrees in front of the converter, adding the steel scrap, after the steel scrap is fed into the converter, shaking the converter to +108 degrees, utilizing the dead weight of the steel scrap and cooling, and consolidating the position of the press cake on the slag surface.
Specifically, in the furnace bottom maintenance mode, the adding amount of the iron scrap press cake is 2000-3000 kg.
Specifically, in the slag surface maintenance mode, the adding amount of the scrap iron press cake is 3000-5000 kg.
Specifically, the slag splashing model comprises: the slag splashing device comprises a first slag splashing model, a second slag splashing model and a third slag splashing model;
selecting different slag splashing models according to different end point oxygen, and specifically comprising the following steps:
when the end point oxygen is less than 400ppm, selecting a first slag splashing model;
when the end point oxygen is more than 400ppm and less than 550ppm, selecting a second slag splashing model;
and when the end point oxygen is more than 550ppm, selecting a third slag splashing model.
Specifically, the end point carbon content of the converter is controlled to be less than 0.07 percent, and the end point oxygen is controlled to be more than 400ppm.
The beneficial effects that produce are: the converter in the prior art generally adopts slag splashing furnace protection and fettling material to maintain the furnace lining, the invention does not need the cost investment of fettling material, basically avoids the adverse effect on fettling operation caused by poor control of sintering time, has no problem of environmental pollution, has the advantages of high maintenance speed, good fettling effect and the like while ensuring the end point components of molten steel, fundamentally improves the service life of the furnace lining of the converter and the operation rate of the converter, and has important significance for safe and stable operation of the converter and improvement of yield.
The method for quickly maintaining the converter inverted slag surface and the furnace bottom lining has the advantages of simple steps, low cost, short time of 4-6 min, no need of stopping the furnace and maintaining the slag surface in a production period, capability of safely and quickly achieving the effect of maintaining the furnace lining under the production of full load and high operation rate, no influence on the production continuity, effective improvement of the converter operation rate, no need of investment of the repairing material cost, no adverse influence and environmental pollution problems caused by overlong or overlong sintering time of the repairing material on the repairing furnace, great saving of the cost of the repairing material, great saving of the maintaining time of the furnace condition, capability of saving the repairing time by 50-60 min/time, improvement of the production efficiency and important guarantee for stable and smooth production of the converter.
Drawings
FIG. 1 is a flow chart of a method for rapidly maintaining a converter slag pouring surface and a converter bottom lining according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a press cake made of iron filings according to an embodiment of the present invention;
fig. 3 is a diagram of the effect of the press cake in the furnace in the slag surface maintenance mode provided by the embodiment of the 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 obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
In an embodiment of the present invention, as shown in fig. 1, there is provided a method for rapidly maintaining a converter slag-pouring surface and a converter bottom lining, the method including the following steps:
measuring the thickness of the converter, and determining the erosion condition of the slag dumping surface and the erosion condition of the furnace bottom; and (3) measuring the thickness of the converter by using a thickness gauge in advance, checking the slag surface erosion and the furnace bottom erosion conditions according to the thickness measurement map data, and selecting different furnace lining maintenance modes.
Determining a maintenance mode according to the slag dumping surface erosion condition and the furnace bottom erosion condition; the maintenance mode includes: a slag surface maintenance mode and a furnace bottom maintenance mode; when the thickness of the slag surface is less than 500mm, selecting a slag surface maintenance mode; when the thickness of the measured furnace bottom is less than 700mm, selecting a furnace bottom maintenance mode;
in the slag surface maintenance mode, the whole slag amount is reserved after tapping, and the converter is shaken to different angles to maintain different positions of the slag surface; after the iron chips are pressed into the furnace, the furnace body is quickly shaken to +90 degrees, so that the iron chips are completely covered by the slag; as shown in figure 3, under the action of the temperature difference between the pressed cake and the slag, high-melting-point minerals in the slag are separated out and condensed and are adhered to the converter slag-reversing surface lining to replace the traditional fettling material.
In a furnace bottom maintenance mode, firstly deslagging after tapping, reserving 8-10 t of furnace slag, shaking the furnace to 60 ℃, adding scrap iron press cakes, then shaking the converter to-55 ℃, shaking the furnace to +45 ℃, continuing shaking the furnace to-20 ℃, and then shaking to a zero position, so as to uniformly spread the scrap iron press cakes fed into the furnace at the furnace bottom, and standing and cooling the converter for 2-5 minutes.
In the maintenance mode, different slag splashing models are set according to different terminal oxygen.
In the slag surface maintenance mode, slag splashing protection is carried out without adding slag adjusting agent, and slag is splashed onto the furnace body.
In the maintenance mode of the furnace bottom, 50 percent of the total amount of the raw white is added 60 seconds after the start of slag splashing, and the rest 50 percent of the raw white is added 180 seconds after the start of slag splashing to press the furnace bottom, so that the iron scrap press cake is stabilized at the furnace bottom. The raw white is uncalcined dolomite, i.e. raw dolomite, the main chemical component of which is CaCO 3 And MgCO 3 After the dolomite is added, the MgO content in the slag can be increased, the melting point of the converter slag is reduced, the erosion of the furnace lining by the slag can be reduced, the raw dolomite is firstly decomposed and cracked at high temperature in steel making to form MgO and CaO particles, and then is subjected to a dissolution reaction with the slag, and simultaneously, because CO is added 2 The stirring effect of the bubbles completes the decomposition of carbonate in the raw dolomite in one step at the steelmaking temperature of the converter. The dephosphorization rate of the steel making is improved from 83.2 percent to 84.1 percent by using the raw dolomite for slagging.
In the slag surface maintenance mode, the whole slag amount is reserved after tapping, the furnace is respectively shaken to 70 degrees, 60 degrees and 55 degrees, and maintenance is carried out aiming at different positions of the slag surface; and (3) pressing the iron chips into the furnace by using a waste steel bucket, and then shaking the furnace body to +90 degrees, so that the iron chips are completely covered by the slag. Under the action of the temperature difference between the press cake and the slag, high-melting-point minerals in the slag are separated out and condensed and are adhered to a converter slag-pouring surface furnace lining to replace the traditional fettling material. The adopted press cake is a scrap iron press cake.
After the slag splashing is finished, slag pouring is carried out, and in the slag pouring, the slag passes through the slag surface and covers the press cake at the slag surface.
After deslagging, shaking the converter to a slag retention confirmation position, after staying for 2-3 s, shaking the converter to + 55- +60 ℃ in front of the converter, adding the waste steel, after the waste steel is fed into the converter, shaking the converter to +108 ℃, and consolidating the position of the press cake on the slag surface by utilizing the dead weight of the waste steel and cooling.
In the maintenance mode of the furnace bottom, the adding amount of the iron chip press cake is 2000-3000 kg.
In the slag surface maintenance mode, the adding amount of the scrap iron press cake is 3000-5000 kg.
The slag splashing model comprises: the slag splashing device comprises a first slag splashing model, a second slag splashing model and a third slag splashing model; specific model parameters are shown in tables 1, 2 and 3.
Selecting different slag splashing models according to different end point oxygen, and specifically comprising the following steps:
when the end point oxygen is less than 400ppm, selecting a first slag splashing model;
when the end point oxygen is more than 400ppm and less than 550ppm, selecting a second slag splashing model;
when the end point oxygen is more than 550ppm, a third slag splashing model is selected.
The end point carbon content of the converter is controlled to be less than 0.07 percent, and the end point oxygen is controlled to be more than 400ppm. The carbon content at the end point of molten steel tapping before the maintenance of the furnace lining is controlled to be less than 0.07 percent, and the oxygen at the end point is controlled to be more than 400ppm as much as possible, so that the slag is ensured to have better fluidity, and the covering effect of the slag can be enhanced. In general, the amount of slag required for a 150-ton converter is generally about 20 tons.
TABLE 1 first parameter table of slag splashing model
TABLE 2 second slag splashing model parameter Table
TABLE 3 parameter table of the third slag splashing model
The converter in the prior art generally adopts slag splashing furnace protection and fettling material to maintain the furnace lining, the invention does not need the fettling material cost input, basically avoids the adverse effect on fettling operation caused by poor control of sintering time, has no problem of environmental pollution, ensures the composition of the molten steel end point, has the advantages of fast maintenance speed, good fettling effect and the like, fundamentally improves the service life of the furnace lining of the converter and the operation rate of the converter, and has important significance for safe and stable operation of the converter and improvement of yield.
The method for quickly maintaining the converter inverted slag surface and the furnace bottom lining has the advantages of simple steps, low cost, short time of 4-6 min, digestion in a production period, no need of stopping the furnace and then maintaining the slag surface, safety and quickness under the production of full load and high operation rate, no influence on production continuity, effective improvement of the converter operation rate, no need of investment of repairing materials, no adverse influence and environmental pollution problems caused by overlong or overlong sintering time of the repairing materials on the repairing furnace, great saving of the cost of materials for repairing the furnace, great saving of the time for maintaining the furnace condition, saving of 50-60 min/time, improvement of the production efficiency and important guarantee for stable and smooth production of the converter.
Example 1:
the invention discloses a converter slag pouring surface and furnace bottom lining rapid maintenance method, which comprises the following steps: confirming furnace conditions, adding iron chip press cakes, adding slag splashing materials, controlling slag splashing models, deslagging,
s1: measuring the thickness of the converter by using a thickness gauge in advance, and checking the erosion position of the slag surface and the erosion position of the furnace bottom according to a thickness measurement diagram;
s2: according to the corrosion position of the converter slag surface, iron chips are pressed into a scrap steel bucket in advance for standby;
s3: the scrap iron in the scrap steel bucket is pressed into the furnace by the travelling crane, and two different operation modes are selected according to the thickness measurement condition: (1) a slag pressing surface operation mode, namely, reserving the whole slag amount after tapping, shaking the furnace to 70 degrees, 60 degrees and 55 degrees, selecting different angles to maintain different positions of the slag surface, quickly shaking the furnace body to about +90 degrees after the furnace is placed in the furnace, observing whether the slag completely covers a press cake, separating out and condensing high-melting-point mineral substances in the slag under the action of the temperature difference between the press cake and the slag, and adhering the high-melting-point mineral substances to a converter slag pouring surface furnace lining to replace fettling materials; (2) a furnace bottom pressing operation mode, wherein after tapping is finished, slag pouring operation is carried out, 8-10 t of slag is reserved, the furnace is shaken to 60 ℃, scrap iron press cakes in a scrap steel bucket are fed, the furnace is quickly shaken to-55 ℃ after being fed into the furnace, then the furnace is shaken to +45 ℃, the furnace is continuously shaken to-20 ℃ and then is shaken to a zero position, the aim is to uniformly spread the scrap iron press cakes fed into the furnace at the furnace bottom, and after the operation is finished, the converter is kept stand and cooled for 2-5 minutes;
s4: and (3) material adding operation, namely selecting a corresponding feeding mode aiming at S3: (1) adding 50% of the total amount of the raw white 60 seconds after the start of slag splashing in a furnace bottom pressing mode, and adding the rest 50% of the raw white into the furnace bottom in 180 seconds to promote iron scrap press cakes to be stable at the furnace bottom, (2) performing slag splashing protection on slag splashing in a slag surface pressing mode without adding any slag regulating agent, splashing a large amount of slag onto a furnace body, setting gun position flow control on the splashing according to models, and selecting different slag splashing models to splash slag according to different end point oxygen;
s5: slag splashing operation, wherein slag splashing is performed according to different end point oxygen selection corresponding slag splashing modes;
s6: and performing deslagging operation after slag splashing is finished, covering flowing slag on a press cake at the slag surface after the flowing slag passes through the slag surface, shaking the converter to a slag retention confirmation position after deslagging is finished, observing the slag surface condition after staying for 2-3 s, shaking the converter to +55 to +60 degrees before the converter, entering waste steel, shaking the converter to +108 degrees after the waste steel is fed into the converter, and consolidating the position of the press cake on the slag surface by using the self weight of the waste steel and cooling.
As shown in fig. 2, the press cake used for S1, S2, S3, S4, S5, S6 is a scrap iron press cake;
particularly, aiming at the steps S2, S3 and S4, when the furnace bottom pressing mode is selected for maintenance, the adding amount of the scrap iron press cake is 2000-3000 kg, and when the slag surface pressing mode is selected for maintenance, the adding amount of the scrap iron press cake is 3000-5000 kg;
in particular, there were 3 different slag splashing patterns for S5 for different end points.
(1) Selecting a first slag splashing model when the end point oxygen is less than 400ppm,
(2) selecting a second slag splashing model when the end point oxygen is more than 400ppm and less than 550ppm,
(3) selecting a third slag splashing model with the end point oxygen of more than 550ppm,
specific model parameters are shown in tables 1, 2 and 3.
Example 2:
liu Gang converter No. 7 converter stokehole worker adopts a thickness gauge to perform side thickness on a furnace bottom and a furnace body, confirms that a slag surface needs to be maintained, shakes the converter to +60 degrees after finishing steel tapping of a smelting furnace, quickly pours 3.5t scrap iron press cakes in a scrap steel bucket into the converter by using a travelling crane, quickly shakes the converter body to +91 degrees after entering the converter to observe that the slag completely covers the press cakes, shakes the converter to a zero position after waiting for 4 minutes, measures terminal oxygen 447ppm according to upper furnace TSO, selects a slag splashing model 2 to perform slag splashing operation, performs slag dumping operation after slag splashing, observes that flowing slag covers the press cakes at the slag surface through the slag surface, shakes the converter to a slag remaining confirmation position after slag dumping is finished, observes the slag surface condition again, confirms that the slag surface has been well covered, then shakes the converter to +58 degrees before entering the converter, shakes the converter to +108 degrees after entering the converter, utilizes the dead weight and cools the converter, consolidates the slag surface of the converter at the slag surface, solves the problem of the problem that the slag surface is corroded by 18 times due to the current slag impact operation. At present, the furnace protection operation is popularized in 8 converters in a Liu steel converter plant, the optimal furnace life reaches 35000 furnaces, and the furnace protection operation is at an advanced level in China.
The method for quickly maintaining the converter inverted slag surface and the furnace bottom lining has the advantages of simple steps, low cost, short time of 4-6 min, digestion in a production period, no need of stopping the furnace and then maintaining the slag surface, safety and quickness under the production of full load and high operation rate, no influence on production continuity, effective improvement of the converter operation rate, no need of investment of repairing materials, no adverse influence and environmental pollution problems caused by overlong or overlong sintering time of the repairing materials on the repairing furnace, great saving of the cost of materials for repairing the furnace, great saving of the time for maintaining the furnace condition, saving of 50-60 min/time, improvement of the production efficiency and important guarantee for stable and smooth production of the converter.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. In order that the components of the present invention may be combined without conflict, it should be apparent to one skilled in the art that various changes and modifications can be made without departing from the spirit and scope of the invention.
Claims (10)
1. A converter slag-pouring surface and furnace bottom lining rapid maintenance method is characterized by comprising the following steps:
measuring the thickness of the converter, and determining the erosion condition of the slag dumping surface and the erosion condition of the furnace bottom;
determining a maintenance mode according to the erosion condition of the slag dumping surface and the erosion condition of the furnace bottom; the maintenance mode includes: a slag surface maintenance mode and a furnace bottom maintenance mode;
in the slag surface maintenance mode, the whole slag amount is reserved after tapping, and the converter is shaken to different angles to maintain different positions of the slag surface; after the iron chips are pressed into the furnace, the furnace body is quickly shaken to +90 degrees, so that the iron chips are completely covered by the slag;
in a furnace bottom maintenance mode, firstly deslagging after tapping, reserving 8-10 t of furnace slag, shaking the furnace to 60 ℃, adding scrap iron to press cakes, then shaking the converter to-55 ℃, shaking the furnace to +45 ℃, continuing to shake the furnace to-20 ℃, shaking the furnace to a zero position, and standing and cooling the converter for 2-5 minutes;
in the maintenance mode, different slag splashing models are set according to different terminal oxygen.
2. The method for rapid maintenance of the inverted slag surface and the bottom lining of the converter according to claim 1, wherein in the slag surface maintenance mode, slag splashing protection is performed without adding a slag modifier, and slag is splashed onto the furnace body.
3. The method as claimed in claim 1, wherein in the maintenance mode of the furnace bottom, 50% of the total amount of the white pigment is added 60 seconds after the start of the slag splash, and the remaining 50% of the white pigment is added 180 seconds after the start of the slag splash.
4. The method for rapidly maintaining the inverted slag surface and the furnace bottom lining of the converter according to claim 1, wherein in the slag surface maintenance mode, the whole slag amount is reserved after tapping, the furnace is respectively shaken to 70 degrees, 60 degrees and 55 degrees, and maintenance is performed on different positions of the slag surface; and (3) after the scrap iron press cake is put into the furnace by using a scrap steel bucket, shaking the furnace body to +90 degrees, and enabling the slag to completely cover the scrap iron press cake.
5. The method of claim 1, wherein the deslagging is performed after the splashing is completed, and wherein the deslagging is performed by passing the slag over the slag surface and covering the press cake at the slag surface.
6. The method for rapidly maintaining the inverted slag surface and the furnace bottom lining of the converter according to claim 5, wherein the converter is shaken to a slag retention confirmation position after deslagging, the converter is shaken to a position of +55 to +60 degrees before the converter is stopped for 2 to 3 seconds, waste steel is added, and after the waste steel is completely added, the converter is shaken to a position of +108 degrees, and the position of the press cake on the slag surface is consolidated by using the self weight of the waste steel and cooling.
7. The method for rapidly maintaining the converter slag pouring surface and the furnace bottom lining according to claim 1, wherein in the furnace bottom maintenance mode, the addition amount of the iron chip press cake is 2000-3000 kg.
8. The method for rapidly maintaining the inverted slag surface and the furnace bottom lining of the converter according to claim 1, wherein in the slag surface maintenance mode, the addition amount of the iron scrap press cake is 3000-5000 kg.
9. The method for rapidly maintaining the converter slag-pouring surface and the converter bottom lining according to claim 1, wherein the slag splashing model comprises the following steps: the slag splashing device comprises a first slag splashing model, a second slag splashing model and a third slag splashing model;
selecting different slag splashing models according to different end point oxygen, and specifically comprising the following steps:
when the end point oxygen is less than 400ppm, selecting a first slag splashing model;
when the end point oxygen is more than 400ppm and less than 550ppm, selecting a second slag splashing model;
when the end point oxygen is more than 550ppm, a third slag splashing model is selected.
10. The method as claimed in claim 1, wherein the final carbon content of the converter is controlled to be less than 0.07% and the final oxygen content is controlled to be more than 400ppm.
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