CN111593165A - Maintenance method for converter lining - Google Patents
Maintenance method for converter lining Download PDFInfo
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- CN111593165A CN111593165A CN202010644722.6A CN202010644722A CN111593165A CN 111593165 A CN111593165 A CN 111593165A CN 202010644722 A CN202010644722 A CN 202010644722A CN 111593165 A CN111593165 A CN 111593165A
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- pipe
- valve
- converter
- lining
- pipeline
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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
- C21C5/443—Hot fettling; Flame gunning
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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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a maintenance method of a converter lining, which relates to the technical field of metallurgical engineering and comprises the following steps: step one, after converter tapping, erecting a converter; secondly, the furnace lining of the converter comprises a plurality of defective parts, and a nozzle of the gunning device of the furnace lining of the converter is lifted and turned to enable the nozzle to be opposite to one defective part of the furnace lining; step three, uniformly spraying the repairing materials on the corresponding defect parts by using a nozzle; step four, repeating the step two and the step three until spray repair of all the defective parts of the furnace lining is finished; and fifthly, performing slag splashing furnace protection operation. The converter lining maintenance method can compensate key erosion parts of the converter lining at fixed points, and the converter lining maintenance parts have the advantages of strong erosion resistance, small operation difficulty, short maintenance time and small temperature drop of the converter lining.
Description
Technical Field
The invention relates to the technical field of metallurgical engineering, in particular to a maintenance method and a maintenance method for a converter lining.
Background
The converter lining consists of a heat insulating layer, a permanent layer and a working layer. In the working process of the converter, the working layer is easily damaged by extremely complex physical and chemical reactions, mechanical movement and high temperature, and a large amount of time is needed for maintenance. The damage progress of the furnace lining is reduced, the service life of the furnace lining of the converter is prolonged, and the method has important significance for improving the yield of the converter and improving the purity of steel.
The maintenance method of the converter lining mainly comprises slag splashing furnace protection, spray repair and the like. In the actual production process, slag splashing furnace protection operation can uniformly splash slag on a furnace lining, but a protective layer formed by the slag has insufficient erosion resistance, and the slag splashing furnace protection operation cannot make up for key erosion parts of the furnace lining at fixed points. The gunning can be used for performing key repair on a lining erosion part, but the converter needs to be inclined at a specific angle in the gunning process, the operation difficulty is high, in the prior art, the gunning operation is usually performed after slag splashing is completed, in order to ensure that a fettling material is firmly attached to the surface of steel slag, long-time oxygen blowing and sintering are needed after the gunning material is sprayed, the heat dissipation capacity of the lining is high, the smelting period of molten steel in a first furnace after the furnace is replenished is long, and the molten steel quality stability is influenced.
Therefore, how to provide a method for maintaining a converter lining, which can make up for key erosion parts of the lining at fixed points, has the advantages of strong erosion resistance of the converter lining after maintenance, small operation difficulty, short maintenance time and small temperature drop of the lining, becomes a problem to be solved by those skilled in the art at present.
Disclosure of Invention
In order to solve the technical problems, the invention provides a maintenance method of a converter lining, which can make up for key erosion parts of the converter lining at fixed points, and after maintenance is completed, the converter lining has strong erosion resistance, small operation difficulty, short maintenance time and small temperature drop of the converter lining.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a maintenance method of a converter lining, which comprises the following steps: step one, after tapping of a converter, erecting the converter; secondly, the furnace lining of the converter comprises a plurality of defective parts, and a nozzle of the gunning device of the furnace lining of the converter is lifted and turned to enable the nozzle to be opposite to one defective part of the furnace lining; step three, uniformly spraying the repairing materials on the corresponding defect parts by the nozzles; step four, repeating the step two and the step three until spray repairing of all the defective parts of the furnace lining is completed; and fifthly, performing slag splashing furnace protection operation.
Preferably, the gunning device for the converter lining comprises: the spray gun assembly comprises a vertical metal spray pipe, a feed pipe, a pinion, a power device and a bull gear, wherein the first end of the vertical metal spray pipe is communicated with the first end of the feed pipe, the second end of the vertical metal spray pipe is bent to form the spray nozzle, the pinion is sleeved on the outer side wall of the vertical metal spray pipe and is fixedly connected with the vertical metal spray pipe, the power device is in transmission connection with the bull gear to drive the bull gear to rotate, and the bull gear is meshed with the pinion; a bin assembly including a feed pipe, a large bin, a discharge pipe, a first gas inlet branch pipe, a second gas inlet branch pipe, a first pressure relief pipe and a second pressure relief pipe, the feed pipe being in communication with the large bin, the large bin being in communication with the small bin through the discharge pipe, the small bin being in communication with the second end of the feed pipe through the discharge pipe, the first end of the first gas inlet branch pipe being in communication with the gas inlet main pipe, the second end of the first gas inlet branch pipe being in communication with the large bin, the first end of the second gas inlet branch pipe being in communication with the gas inlet main pipe, the second end of the second gas inlet branch pipe being in communication with the small bin, the large bin being in communication with the first pressure relief pipe for pressure relief, the small storage bin is communicated with the second pressure relief pipeline to relieve pressure; the valve group comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve and a seventh valve, the first valve is arranged on the feeding pipeline to control the on-off of the feeding pipeline, the second valve is arranged on the blanking pipeline to control the on-off of the blanking pipeline, the third valve is arranged on the discharging pipeline to control the on-off of the discharging pipeline, the fourth valve is arranged on the first pressure relief pipeline to control the on-off of the first pressure relief pipeline, the fifth valve is arranged on the second pressure relief pipeline to control the on-off of the second pressure relief pipeline, the sixth valve is arranged on the first air inlet branch pipeline to control the on-off of the first air inlet branch pipeline, and the seventh valve is arranged on the second air inlet branch pipeline, So as to control the on-off of the second air inlet branch pipeline; and the lifting device is connected with the vertical metal spray pipe so as to drive the vertical metal spray pipe to lift along the vertical direction.
Preferably, converter furnace lining gunning device still includes first booster, second booster, supplementary ejection of compact pipeline and eighth valve, first booster set up in on the unloading pipeline, the second booster set up in on the ejection of compact pipeline, supplementary ejection of compact pipeline's first end with the trunk line that admits air is linked together, supplementary ejection of compact pipeline's second end with ejection of compact pipeline is linked together, the eighth valve set up with on the supplementary ejection of compact pipeline, with control supplementary ejection of compact pipeline break-make.
Preferably, the number of the first air inlet branch pipes and the number of the sixth valves are multiple, a first end of each first air inlet branch pipe is communicated with the main air inlet pipe, a second end of each first air inlet branch pipe is communicated with different positions of the large storage bin, the first air inlet branch pipes and the sixth valves correspond to each other one by one, and the sixth valves are arranged on each first air inlet branch pipe; the second air inlet branch pipelines and the seventh valves are multiple in number, the first ends of the second air inlet branch pipelines are communicated with the air inlet main pipeline, the second ends of the second air inlet branch pipelines are communicated with different positions of the small storage bin respectively, the second air inlet branch pipelines correspond to the seventh valves one by one, and the seventh valves are arranged on the second air inlet branch pipelines.
Preferably, the power device comprises a motor and a speed reducer, an output shaft of the motor is in transmission connection with an input end of the speed reducer, and an output end of the speed reducer is in transmission connection with the large gear; the lifting device is a winch, and the vertical metal spray pipe is fixedly connected with a steel wire rope of the winch.
Preferably, a cooling water loop is arranged inside the side wall of the vertical metal spray pipe, and a water inlet and a water outlet which are communicated with the cooling water loop are arranged on the vertical metal spray pipe.
Preferably, the cooling water loop comprises a first annular water path and a second annular water path which are arranged along the vertical metal nozzle from outside to inside in sequence, and the first annular waterway and the second annular waterway both extend along the axis of the vertical metal lance from the first end of the vertical metal lance to the second end of the vertical metal lance, the first end of the first annular waterway and the first end of the second annular waterway both correspond to the first end of the vertical metal nozzle, the second end of the first annular waterway and the second end of the second annular waterway both correspond to the second end of the vertical metal nozzle, the first end of the first annular water path is communicated with the water inlet, the second end of the first annular water path is communicated with the second end of the second annular water path, and the first end of the second annular water path is communicated with the water outlet.
Preferably, the second end of the vertical metal lance is of a trumpet-like configuration.
Preferably, a first end of the second pressure relief pipeline is communicated with the small storage bin, and a second end of the second pressure relief pipeline is communicated with the large storage bin.
Preferably, a clamping block is arranged on the outer side wall of the vertical metal spray pipe, a vertical clamping groove is formed in the converter, the clamping block is arranged in the vertical clamping groove, and the clamping block is in sliding connection with the clamping groove so that the clamping block can slide along the vertical direction.
Compared with the prior art, the invention has the following technical effects:
1. according to the maintenance method of the converter lining, slag splashing protection and spray repair protection are combined, and the spray repair protection can make up for key erosion parts of the converter lining in a fixed point manner;
2. according to the maintenance method of the converter lining, in the specific maintenance process, the fettling material is clamped between the converter lining and the slag, the fettling material and the steel slag are sintered and adhered to the converter lining by utilizing the waste heat after the steel is tapped from the converter lining, and a new protective layer is formed by the fettling material and the steel slag, and compared with a protective layer formed by the steel slag, the new protective layer is strong in erosion resistance, and the service life of the converter is effectively prolonged;
3. when the converter lining is maintained by adopting the converter lining maintenance method, the converter is in an upright state, and compared with the method for maintaining the converter lining at a specific inclination angle, the operation difficulty is greatly reduced;
4. after the injection of the conventional fettling material is finished, sintering operation is required to be carried out so that the fettling material is fixed on the slag, the maintenance method of the converter lining provided by the invention firstly carries out fettling operation and then carries out slag splashing operation, and after the fettling material is injected on the converter lining, the fettling material can be firmly fixed on the converter lining by using the waste heat after the tapping of the converter, so that the sintering procedure is saved, the maintenance time is shortened, and the condition that the quality of first furnace molten steel is influenced due to the overlarge temperature drop of the converter lining is effectively avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic structural view of a spray gun assembly provided in an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a bin assembly provided in an embodiment of the present invention;
FIG. 3 is an enlarged view of portion A of FIG. 1;
fig. 4 is an enlarged view of a portion B of fig. 1.
Description of reference numerals: 1. a vertical metal lance; 2. a feed pipe; 3. a pinion gear; 4. a bull gear; 5. a nozzle; 6. a feed conduit; 7. a large storage bin; 8. a blanking pipeline; 9. a small storage bin; 10. a discharge pipeline; 11. a main air inlet pipeline; 12. a first inlet branch duct; 13. a second inlet branch conduit; 14. a first pressure relief conduit; 15. a second pressure relief conduit; 16. a first valve; 17. a second valve; 18. a third valve; 19. a fourth valve; 20. a fifth valve; 21. a sixth valve; 22. a seventh valve; 23. a first booster; 24. a second booster; 25. an auxiliary discharge pipe; 26. an eighth valve; 27. a wire rope; 28. a first annular waterway; 29. a second annular waterway; 30. a water inlet; 31. a water outlet; 32. a clamping block; 33. a motor; 34. and a speed reducer.
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.
The invention aims to provide a maintenance method of a converter lining, which can make up key erosion parts of the converter lining at fixed points, has strong erosion resistance of the converter lining after maintenance is finished and has small operation difficulty.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment provides a converter lining maintenance method, which comprises the following steps: step one, after converter tapping, erecting a converter; secondly, the furnace lining of the converter comprises a plurality of defective parts, and a nozzle 5 of the gunning device of the furnace lining of the converter is lifted and turned to enable the nozzle 5 to be opposite to one defective part of the furnace lining; step three, uniformly spraying the repairing materials on the corresponding defect parts by using the nozzles 5; step four, repeating the step two and the step three until spray repair of all the defective parts of the furnace lining is finished; and fifthly, performing slag splashing furnace protection operation. The converter lining maintenance method can compensate key erosion parts of the converter lining at fixed points, and the converter lining maintenance parts have the advantages of strong erosion resistance, small operation difficulty, short maintenance time and small temperature drop of the converter lining.
The number of the defective portions of the furnace lining may be one or more, and in the case of one, the first step, the second step, the third step and the fifth step may be performed in sequence without repeating the second step and the third step.
In this embodiment, referring to fig. 1 to 2, the gunning device for a lining of a converter includes: the spray gun comprises a spray gun component and a spray gun component, wherein the spray gun component comprises a vertical metal spray pipe 1, a feeding pipe 2, a small gear 3, a power device and a large gear 4, the first end of the vertical metal spray pipe 1 is communicated with the first end of the feeding pipe 2, the second end of the vertical metal spray pipe 1 is bent to form a spray nozzle 5, the small gear 3 is sleeved on the outer side wall of the vertical metal spray pipe 1 and is fixedly connected with the vertical metal spray pipe 1, the power device is in transmission connection with the large gear 4 to drive the large gear 4 to rotate, and the large gear 4 is; a stock bin assembly, the stock bin assembly includes a feed pipe 6, a big stock bin 7, a blanking pipe 8, a small stock bin 9, a discharge pipe 10, a main air inlet pipe 11, a first sub air inlet pipe 12, a second sub air inlet pipe 13, a first pressure relief pipe 14 and a second pressure relief pipe 15, the feed pipe 6 is communicated with a fettling material, the feed pipe 6 is communicated with the big stock bin 7, the big stock bin 7 is communicated with the small stock bin 9 through the blanking pipe 8, the small stock bin 9 is communicated with a second end of the feed pipe 2 through the discharge pipe 10, the main air inlet pipe 11 is communicated with nitrogen, a first end of the first sub air inlet pipe 12 is communicated with the main air inlet pipe 11, a second end of the first sub air inlet pipe 12 is communicated with the big stock bin 7, a first end of the second sub air inlet pipe 13 is communicated with the main air inlet pipe 11, a second end of the second sub air inlet pipe 13 is communicated with the small stock bin 9, the big stock bin 7 is communicated with the, The small bin 9 is communicated with a second pressure relief pipeline 15 for pressure relief; the valve group comprises a first valve 16, a second valve 17, a third valve 18, a fourth valve 19, a fifth valve 20, a sixth valve 21 and a seventh valve 22, the first valve 16 is arranged on the feeding pipeline 6 to control the on-off of the feeding pipeline 6, the second valve 17 is arranged on the blanking pipeline 8, to control the on-off of the blanking pipeline 8, the third valve 18 is arranged on the discharge pipeline 10 to control the on-off of the discharge pipeline 10, the fourth valve 19 is arranged on the first pressure relief pipeline 14 to control the on-off of the first pressure relief pipeline 14, the fifth valve 20 is arranged on the second pressure relief pipeline 15 to control the on-off of the second pressure relief pipeline 15, the sixth valve 21 is arranged on the first air inlet branch pipeline 12 to control the on-off of the first air inlet branch pipeline 12, and the seventh valve 22 is arranged on the second air inlet branch pipeline 13 to control the on-off of the second air inlet branch pipeline 13; and the lifting device is connected with the vertical metal spray pipe 1 so as to drive the vertical metal spray pipe 1 to lift along the vertical direction. So set up, nozzle 5 turns to and goes up and down conveniently.
The thickness of the bull gear 4 in this embodiment needs to be consistent with the lifting stroke of the vertical metal nozzle 1 or larger than the lifting stroke of the vertical metal nozzle 1, so that the pinion 3 can be always engaged with the bull gear 4 in the lifting process of the vertical metal nozzle 1.
In this embodiment, as shown in fig. 2, the gunning device for the lining of the converter further includes a first booster 23, a second booster 24, an auxiliary discharging pipeline 25 and an eighth valve 26, the first booster 23 is disposed on the discharging pipeline 8, the second booster 24 is disposed on the discharging pipeline 10, a first end of the auxiliary discharging pipeline 25 is communicated with the main air inlet pipeline 11, a second end of the auxiliary discharging pipeline 25 is communicated with the discharging pipeline 10, and the eighth valve 26 is disposed on the auxiliary discharging pipeline 25 to control the on-off of the auxiliary discharging pipeline 25. The two structures of first booster 23 and second booster 24 are the same, and all belong to prior art, and the booster is used for driving the material to remove among the prior art, prevents that the material from blockking up the pipeline. The fan is specifically selected to serve as the first booster and the second booster in this embodiment. The arrangement of the first booster 23 enables the repairing mass in the large storage bin 7 to rapidly enter the small storage bin 9, and the condition that a falling pipeline is blocked is effectively avoided. The arrangement of the second booster 24 enables the repairing mass in the discharging pipeline 10 to rapidly enter the feeding pipe 2, and the situation that the discharging pipeline 10 is blocked is effectively avoided.
In this embodiment, as shown in fig. 2, the number of the first branch air inlet pipes 12 and the number of the sixth valves 21 are multiple, the first end of each first branch air inlet pipe 12 is communicated with the main air inlet pipe 11, the second end of each first branch air inlet pipe 12 is communicated with different positions of the large bunker 7, the first branch air inlet pipes 12 correspond to the sixth valves 21 one by one, and the sixth valves 21 are disposed on each first branch air inlet pipe 12; the number of the second air inlet branch pipelines 13 and the number of the seventh valves 22 are multiple, the first end of each second air inlet branch pipeline 13 is communicated with the air inlet main pipeline 11, the second end of each second air inlet branch pipeline is communicated with different positions of the small storage bin 9, the second air inlet branch pipelines 13 correspond to the seventh valves 22 one by one, and the seventh valves 22 are arranged on the second air inlet branch pipelines 13. Specifically, in this embodiment, the number of the first branch intake pipes 12 and the number of the sixth valves 21 are both two, and the number of the second branch intake pipes 13 and the number of the seventh valves 22 are both three. So set up, the mending material is carried more smoothly, fast.
In the present embodiment, specifically, the power device includes a motor 33 and a speed reducer 34, an output shaft of the motor 33 is in transmission connection with an input end of the speed reducer 34, and an output end of the speed reducer 34 is in transmission connection with the gearwheel 4; the lifting device is a winch, and the vertical metal spray pipe 1 is fixedly connected with a steel wire rope 27 of the winch.
In this embodiment, in order to prevent the temperature of the vertical metal nozzle 1 from being too high, a cooling water loop is disposed inside the sidewall of the vertical metal nozzle 1, and the vertical metal nozzle 1 is provided with a water inlet 30 and a water outlet 31 communicated with the cooling water loop. The water inlet 30 is provided with a water inlet valve for controlling the on-off of the water inlet 30, and the water outlet 31 is provided with a water outlet valve for controlling the on-off of the water outlet 31.
In this embodiment, as shown in fig. 3 and 4, the cooling water circuit includes a first annular water path 28 and a second annular water path 29 sequentially arranged from outside to inside along the vertical metal nozzle 1, the first annular water path 28 and the second annular water path 29 both extend from the first end of the vertical metal nozzle 1 to the second end of the vertical metal nozzle 1 along the axis of the vertical metal nozzle 1, the first end of the first annular water path 28 and the first end of the second annular water path 29 both correspond to the first end of the vertical metal nozzle 1, the second end of the first annular water path 28 and the second end of the second annular water path 29 both correspond to the second end of the vertical metal nozzle 1, the first end of the first annular water path 28 is communicated with the water inlet 30, the second end of the first annular water path 28 is communicated with the second end of the second annular water path 29, and the first end of the second annular water path 29 is communicated with the water outlet 31. So set up, vertical metal spray tube 1 cooling effect is good. The flow direction of the cooling water in the specific use process is water inlet 30-first annular water path 28-second annular water path 29-water outlet 31.
In this embodiment, for the convenience of spraying, the second end of the vertical metal nozzle 1 is in a horn-shaped structure.
In this embodiment, a first end of the second pressure relief pipeline 15 is communicated with the small bin 9, and a second end of the second pressure relief pipeline is communicated with the large bin 7. So set up, 9 combustion gas of little feed bin gets into big feed bin 7 for 7 pressure increase in big feed bin make big feed bin 7 more quick, smooth and easy unloading.
In this embodiment, a clamping block 32 is disposed on the outer side wall of the vertical metal nozzle 1, a vertical clamping groove is disposed on the converter, the clamping block 32 is disposed in the vertical clamping groove, and the clamping block 32 is slidably connected with the clamping groove so that the clamping block 32 can slide along the vertical direction. The clamping block 32 and the vertical clamping groove are matched to effectively avoid the situation that the vertical metal spray pipe 1 is inclined in the lifting process.
The maintenance method of the converter lining is described below with reference to specific examples:
80t converter large surface with pit
7 feeding of a large storage bin: the high-pressure charging bucket is connected with the feeding pipeline 6 in a turning mode, the first valve 16 and the fourth valve 19 are opened, high-pressure pneumatic feeding is started, and when the large storage bin 7 reaches 9.8t, the first valve 16 and the fourth valve 19 are closed to stop feeding;
feeding in a small storage bin 9: opening the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23, and closing the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23 when the small storage bin 9 reaches 1.2 t;
spray repair: opening a seventh valve 22, when the pressure of the small storage bin 9 reaches 0.05MPa, opening an eighth valve 26, a third valve 18 and a second booster 24, feeding repairing materials into the vertical metal spray pipe 1 through the feeding pipe 2, descending the vertical metal spray pipe 1 at a constant speed of 1m/s, simultaneously opening a water inlet 30 and a water outlet 31, rotating a pinion 3(0 degree), aligning the nozzle 5 to a large-surface pit part in the descending process of the vertical metal spray pipe 1, performing spray repair with emphasis, moving the vertical metal spray pipe up and down for 11 minutes after 1 minute of spray repair, and uniformly spray-repairing the residual materials in the small storage bin 9 on the large surface;
after the gunning is finished, slag splashing and furnace protection are carried out, the slag splashing and furnace protection time is 2.5 minutes, when slag splashing occurs, the height of a gun is from 16m to 9m, and slag is uniformly splashed on the fettling material until no steel slag is splashed out of a furnace opening;
and (5) after slag splashing is finished, reversing the furnace to add iron, and remaining slag.
The total time of the fettling is 4.5 minutes, and the fettling material at the pit part begins to drop off a small amount after 12 fettling materials are attached.
80t converter small surface pit
7 feeding of a large storage bin: the high-pressure charging bucket is connected with the feeding pipeline 6 in a turning mode, the first valve 16 and the fourth valve 19 of the valves are opened, high-pressure pneumatic feeding is started, and when the large storage bin 7 reaches 9.7t, the first valve 16 and the fourth valve 19 are closed to stop feeding;
feeding in a small storage bin 9: opening the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23, and closing the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23 when the small storage bin 9 reaches 1.0 t;
spray repair: opening a seventh valve 22, when the pressure of the small storage bin 9 reaches 0.05MPa, opening an eighth valve 26, a third valve 18 and a second booster 24, feeding repairing materials into the vertical metal spray pipe 1 through the feeding pipe 2, descending the vertical metal spray pipe 1 at a constant speed of 1m/s, simultaneously opening a water inlet 30 and a water outlet 31, rotating the pinion 3(180 degrees), aligning the nozzle 5 with a small plane and having a pit part in the descending process of the vertical metal spray pipe 1, performing key spray repair, moving the vertical metal spray pipe up and down for 11 minutes after 1 minute of spray repair, and uniformly spray-repairing the residual materials in the small storage bin 9 on a large plane.
After the gunning is finished, slag splashing and furnace protection are carried out, the slag splashing and furnace protection time is 2.4 minutes, when slag splashing occurs, the height of a gun is from 16m to 9m, and slag is uniformly splashed on the fettling material until no steel slag is splashed out of a furnace opening;
and (5) after slag splashing is finished, reversing the furnace to add iron, and remaining slag.
The total time of the fettling is 4.4 minutes, and the fettling material at the pit part begins to drop off a small amount after being attached to 14 heats.
Trunnion with pit of 80t converter
7 big feed bins of big feed bin 7 material loading: the high-pressure charging bucket is connected with the feeding pipeline 6 in a turning mode, the first valve 16 and the fourth valve 19 of the valves are opened, high-pressure pneumatic feeding is started, and when the large storage bin 7 reaches 10t, the first valve 16 and the fourth valve 19 are closed to stop feeding;
9 small bins of the small bin 9 and 9: opening the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23, and closing the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23 when the small storage bin 9 reaches 1.1 t;
spray repair: opening a seventh valve 22, when the pressure of the small storage bin 9 reaches 0.05MPa, opening an eighth valve 26, a third valve 18 and a second booster 24, enabling a repairing material feeding pipe 2 to enter the vertical metal spray pipe 1, descending the vertical metal spray pipe 1 at a constant speed of 1m/s, simultaneously opening a water inlet 30 and a water outlet 31, rotating a pinion 3(90 degrees), aligning a nozzle 5 to a position with a pit on a trunnion in the descending process of the vertical metal spray pipe 1, performing key spray repair, moving the vertical metal spray pipe up and down for 10.5 minutes after 1.5 minutes of spray repair, and uniformly spray-repairing the residual materials in the small storage bin 9 on a large surface;
after the gunning is finished, slag splashing and furnace protection are carried out, the slag splashing and furnace protection time is 2.8 minutes, when slag splashing occurs, the height of a gun is from 16m to 9m, and slag is uniformly splashed on the fettling material until no steel slag is splashed out of a furnace opening;
after slag splashing is finished, pouring the furnace to add iron, and remaining slag;
the total time of the fettling is 4.8 minutes, and the erosion traces are found after 18 fettling materials at the pit part are attached.
Daily maintenance of 80t converter large surface
7 feeding of a large storage bin: the high-pressure charging bucket is connected with the feeding pipeline 6 in a turning mode, the first valve 16 and the fourth valve 19 of the valves are opened, high-pressure pneumatic feeding is started, and when the large storage bin 7 reaches 9.6t, the first valve 16 and the fourth valve 19 are closed to stop feeding;
feeding in a small storage bin 9: opening the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23, and closing the sixth valve 21, the second valve 17, the fifth valve 20 and the first booster 23 when the small storage bin 9 reaches 1.0 t;
spray repair: opening a seventh valve 22, when the pressure of the small storage bin 9 reaches 0.05MPa, opening an eighth valve 26, a third valve 18 and a second booster 24, feeding repairing materials into the vertical metal spray pipe 1 through the feeding pipe 2, descending the vertical metal spray pipe 1 at a constant speed of 1m/s, simultaneously opening a water inlet 30 and a water outlet 31, rotating a pinion 3(0 degree), aligning a nozzle 5 to a large surface to spray and repair up and down in the descending process of the vertical metal spray pipe 1, moving the vertical metal spray pipe for 12.2 minutes, and uniformly spraying and repairing the materials in the small storage bin 9 on the large surface;
after the gunning is finished, slag splashing and furnace protection are carried out, the slag splashing and furnace protection time is 3 minutes, when slag splashing is carried out, the gun position is from 16m high to 9m low, and slag is uniformly splashed on the fettling material until no steel slag is splashed out at the furnace mouth;
and (5) after slag splashing is finished, reversing the furnace to add iron, and remaining slag.
When the repairing furnace is used for 5.2 minutes, the dropping marks are found only when the large-area repairing furnace is attached to 13 times.
The principle and the implementation mode of the present invention are explained by applying specific examples in the present specification, and the above descriptions of the examples are only used to help understanding the method and the core idea of the present invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.
Claims (10)
1. A maintenance method for a converter lining is characterized by comprising the following steps:
step one, after tapping of a converter, erecting the converter;
secondly, the furnace lining of the converter comprises a plurality of defective parts, and a nozzle of the gunning device of the furnace lining of the converter is lifted and turned to enable the nozzle to be opposite to one defective part of the furnace lining;
step three, uniformly spraying the repairing materials on the corresponding defect parts by the nozzles;
step four, repeating the step two and the step three until spray repairing of all the defective parts of the furnace lining is completed;
and fifthly, performing slag splashing furnace protection operation.
2. The method for maintaining a converter lining according to claim 1, wherein the gunning device for a converter lining comprises:
the spray gun assembly comprises a vertical metal spray pipe, a feed pipe, a pinion, a power device and a bull gear, wherein the first end of the vertical metal spray pipe is communicated with the first end of the feed pipe, the second end of the vertical metal spray pipe is bent to form the spray nozzle, the pinion is sleeved on the outer side wall of the vertical metal spray pipe and is fixedly connected with the vertical metal spray pipe, the power device is in transmission connection with the bull gear to drive the bull gear to rotate, and the bull gear is meshed with the pinion;
a bin assembly including a feed pipe, a large bin, a discharge pipe, a first gas inlet branch pipe, a second gas inlet branch pipe, a first pressure relief pipe and a second pressure relief pipe, the feed pipe being in communication with the large bin, the large bin being in communication with the small bin through the discharge pipe, the small bin being in communication with the second end of the feed pipe through the discharge pipe, the first end of the first gas inlet branch pipe being in communication with the gas inlet main pipe, the second end of the first gas inlet branch pipe being in communication with the large bin, the first end of the second gas inlet branch pipe being in communication with the gas inlet main pipe, the second end of the second gas inlet branch pipe being in communication with the small bin, the large bin being in communication with the first pressure relief pipe for pressure relief, the small storage bin is communicated with the second pressure relief pipeline to relieve pressure;
the valve group comprises a first valve, a second valve, a third valve, a fourth valve, a fifth valve, a sixth valve and a seventh valve, the first valve is arranged on the feeding pipeline to control the on-off of the feeding pipeline, the second valve is arranged on the blanking pipeline to control the on-off of the blanking pipeline, the third valve is arranged on the discharging pipeline to control the on-off of the discharging pipeline, the fourth valve is arranged on the first pressure relief pipeline to control the on-off of the first pressure relief pipeline, the fifth valve is arranged on the second pressure relief pipeline to control the on-off of the second pressure relief pipeline, the sixth valve is arranged on the first air inlet branch pipeline to control the on-off of the first air inlet branch pipeline, and the seventh valve is arranged on the second air inlet branch pipeline, So as to control the on-off of the second air inlet branch pipeline;
and the lifting device is connected with the vertical metal spray pipe so as to drive the vertical metal spray pipe to lift along the vertical direction.
3. The method according to claim 2, wherein the gunning device for the converter lining further comprises a first booster, a second booster, an auxiliary discharge pipe and an eighth valve, the first booster is disposed on the discharge pipe, the second booster is disposed on the discharge pipe, a first end of the auxiliary discharge pipe is communicated with the main air inlet pipe, a second end of the auxiliary discharge pipe is communicated with the discharge pipe, and the eighth valve is disposed on the auxiliary discharge pipe to control on/off of the auxiliary discharge pipe.
4. The method for maintaining the lining of the converter according to claim 2, wherein the number of the first branch gas inlet pipes and the number of the sixth valves are multiple, a first end of each of the first branch gas inlet pipes is communicated with the main gas inlet pipe, a second end of each of the first branch gas inlet pipes is communicated with different positions of the large storage bin, the first branch gas inlet pipes and the sixth valves are in one-to-one correspondence, and the sixth valves are arranged on the first branch gas inlet pipes; the second air inlet branch pipelines and the seventh valves are multiple in number, the first ends of the second air inlet branch pipelines are communicated with the air inlet main pipeline, the second ends of the second air inlet branch pipelines are communicated with different positions of the small storage bin respectively, the second air inlet branch pipelines correspond to the seventh valves one by one, and the seventh valves are arranged on the second air inlet branch pipelines.
5. The converter lining maintenance method according to claim 2, wherein the power device comprises a motor and a speed reducer, an output shaft of the motor is in transmission connection with an input end of the speed reducer, and an output end of the speed reducer is in transmission connection with the gearwheel; the lifting device is a winch, and the vertical metal spray pipe is fixedly connected with a steel wire rope of the winch.
6. The method for maintaining the lining of the converter according to claim 2, wherein a cooling water circuit is provided inside the side wall of the vertical metal lance, and the vertical metal lance is provided with a water inlet and a water outlet which are communicated with the cooling water circuit.
7. The converter lining maintenance method according to claim 6, wherein the cooling water circuit comprises a first annular water path and a second annular water path which are sequentially arranged along the vertical metal nozzle from outside to inside, the first annular water path and the second annular water path both extend from a first end of the vertical metal nozzle to a second end of the vertical metal nozzle along an axis of the vertical metal nozzle, the first end of the first annular water path and the first end of the second annular water path both correspond to the first end of the vertical metal nozzle, the second end of the first annular water path and the second end of the second annular water path both correspond to the second end of the vertical metal nozzle, the first end of the first annular water path is communicated with the water inlet, and the second end of the first annular water path is communicated with the second end of the second annular water path, and the first end of the second annular water channel is communicated with the water outlet.
8. The method of maintaining a lining of a converter according to claim 7, wherein the second end of the vertical metal lance is of a trumpet-like configuration.
9. The method for maintaining a lining of a converter according to claim 2, wherein a first end of the second pressure relief pipeline is in communication with the small bunker, and a second end of the second pressure relief pipeline is in communication with the large bunker.
10. The method for maintaining the lining of the converter according to claim 2, wherein a clamping block is arranged on an outer side wall of the vertical metal nozzle, a vertical clamping groove is formed in the converter, the clamping block is arranged in the vertical clamping groove, and the clamping block is slidably connected with the clamping groove so that the clamping block can slide in the vertical direction.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN1080992A (en) * | 1993-05-22 | 1994-01-19 | 珠海新创冶金科技有限公司 | Spray repairing lance for tilting converter |
| CN2226604Y (en) * | 1994-12-28 | 1996-05-08 | 首钢总公司 | Oxygen lance and spray gun shared hanging connecting device |
| KR100848396B1 (en) * | 2007-05-28 | 2008-07-25 | 주식회사 포스코 | An apparatus for a melting-iron preparation process |
| CN201653152U (en) * | 2010-01-08 | 2010-11-24 | 新疆八一钢铁股份有限公司 | Converter shooter water distributor |
| CN102534105A (en) * | 2010-12-15 | 2012-07-04 | 鞍钢股份有限公司 | Maintenance method of converter lining |
| CN102952916A (en) * | 2012-11-12 | 2013-03-06 | 鞍钢集团工程技术有限公司 | Slag-splashing process method of converter |
| CN103114169A (en) * | 2013-03-07 | 2013-05-22 | 北京瑞普同创科技发展有限公司 | Converter wet spray repair technique |
| CN109762957A (en) * | 2019-03-25 | 2019-05-17 | 西安建筑科技大学 | A method of extending the converter magnesia carbon brick service life |
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2020
- 2020-07-07 CN CN202010644722.6A patent/CN111593165B/en not_active Expired - Fee Related
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1080992A (en) * | 1993-05-22 | 1994-01-19 | 珠海新创冶金科技有限公司 | Spray repairing lance for tilting converter |
| CN2226604Y (en) * | 1994-12-28 | 1996-05-08 | 首钢总公司 | Oxygen lance and spray gun shared hanging connecting device |
| KR100848396B1 (en) * | 2007-05-28 | 2008-07-25 | 주식회사 포스코 | An apparatus for a melting-iron preparation process |
| CN201653152U (en) * | 2010-01-08 | 2010-11-24 | 新疆八一钢铁股份有限公司 | Converter shooter water distributor |
| CN102534105A (en) * | 2010-12-15 | 2012-07-04 | 鞍钢股份有限公司 | Maintenance method of converter lining |
| CN102952916A (en) * | 2012-11-12 | 2013-03-06 | 鞍钢集团工程技术有限公司 | Slag-splashing process method of converter |
| CN103114169A (en) * | 2013-03-07 | 2013-05-22 | 北京瑞普同创科技发展有限公司 | Converter wet spray repair technique |
| CN109762957A (en) * | 2019-03-25 | 2019-05-17 | 西安建筑科技大学 | A method of extending the converter magnesia carbon brick service life |
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| CN111593165B (en) | 2022-03-11 |
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