CN110669897A - Device and method for maintaining gap between nozzle and brick cup after bottom blowing quick change - Google Patents
Device and method for maintaining gap between nozzle and brick cup after bottom blowing quick change Download PDFInfo
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- CN110669897A CN110669897A CN201910995808.0A CN201910995808A CN110669897A CN 110669897 A CN110669897 A CN 110669897A CN 201910995808 A CN201910995808 A CN 201910995808A CN 110669897 A CN110669897 A CN 110669897A
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- 238000007664 blowing Methods 0.000 title claims abstract description 163
- 239000011449 brick Substances 0.000 title claims abstract description 74
- 230000008859 change Effects 0.000 title claims abstract description 35
- 238000000034 method Methods 0.000 title claims abstract description 26
- 238000004140 cleaning Methods 0.000 claims abstract description 65
- 239000004927 clay Substances 0.000 claims abstract description 59
- 239000007921 spray Substances 0.000 claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 27
- 239000010959 steel Substances 0.000 claims abstract description 27
- 238000007789 sealing Methods 0.000 claims abstract description 17
- 238000012423 maintenance Methods 0.000 claims abstract description 12
- 238000005245 sintering Methods 0.000 claims abstract description 5
- 238000011049 filling Methods 0.000 claims abstract description 4
- 238000002360 preparation method Methods 0.000 claims abstract description 3
- 229910052593 corundum Inorganic materials 0.000 claims description 55
- 239000010431 corundum Substances 0.000 claims description 55
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 36
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 27
- 229910052760 oxygen Inorganic materials 0.000 claims description 27
- 239000001301 oxygen Substances 0.000 claims description 27
- 239000002893 slag Substances 0.000 claims description 12
- 239000002699 waste material Substances 0.000 claims description 12
- 238000003723 Smelting Methods 0.000 claims description 11
- 238000005553 drilling Methods 0.000 claims description 11
- 239000003350 kerosene Substances 0.000 claims description 9
- 239000000571 coke Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 8
- 230000008569 process Effects 0.000 claims description 8
- 238000003756 stirring Methods 0.000 claims description 6
- 239000002023 wood Substances 0.000 claims description 5
- 230000006978 adaptation Effects 0.000 claims description 2
- 238000007599 discharging Methods 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 1
- 235000017491 Bambusa tulda Nutrition 0.000 claims 1
- 241001330002 Bambuseae Species 0.000 claims 1
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 1
- 239000011425 bamboo Substances 0.000 claims 1
- 238000009499 grossing Methods 0.000 claims 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 14
- 230000000694 effects Effects 0.000 description 11
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 10
- 239000011819 refractory material Substances 0.000 description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 7
- 229910052799 carbon Inorganic materials 0.000 description 7
- 239000000395 magnesium oxide Substances 0.000 description 7
- 238000005516 engineering process Methods 0.000 description 6
- 229910052742 iron Inorganic materials 0.000 description 5
- 238000011068 loading method Methods 0.000 description 5
- 239000004744 fabric Substances 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 4
- QDOXWKRWXJOMAK-UHFFFAOYSA-N chromium(III) oxide Inorganic materials O=[Cr]O[Cr]=O QDOXWKRWXJOMAK-UHFFFAOYSA-N 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 230000002146 bilateral effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000000284 extract Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 238000010310 metallurgical process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000011012 sanitization Methods 0.000 description 1
- 238000005507 spraying Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
- 230000002277 temperature effect Effects 0.000 description 1
Images
Classifications
-
- 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
- C21C5/46—Details or accessories
-
- 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
- C21C5/30—Regulating or controlling the blowing
- C21C5/35—Blowing from above and through the bath
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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)
Abstract
The invention discloses a device and a method for maintaining the gap between a nozzle and a brick cup after bottom-blowing quick change, the device comprises a maintenance main body and a pushing device, the maintenance main body comprises a cylinder with an opening at one end and a closed end at the other end, the opening end of the cylinder is sequentially provided with a rotating handle and a safety baffle, the end opening of the cylinder is provided with a cylinder screw thread, the cylinder wall of the cylinder is provided with a plurality of mud outlet holes, the pushing device comprises a support rod with a screw thread structure at two ends, the support rod is of a hollow tubular structure, one end of the support rod is sequentially provided with a boosting handle and a sealing cover matched with the cylinder screw thread, the other end of the support rod is provided with a push plate, the method comprises the steps of maintenance preparation, filling of fire clay, rotary leveling, installing a spray gun, baking furnace sintering and cleaning, the invention can effectively maintain the gap between the nozzle and the brick cup after bottom-blowing, the risk of steel leakage at the part of the bottom blowing element is greatly reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgical processes, and particularly relates to a device and a method for maintaining a gap between a nozzle and a brick cup after bottom blowing quick change.
Background
The top-bottom combined blowing of oxygen converter is a new technology and a new process developed in the field of steel making in the end of the 20 th century in the 70 th century. The new smelting mode has the advantages of both top blowing and bottom blowing. The converter steelmaking currently includes mainly top-blown oxygen converter methods (LD, etc.), bottom-blown oxygen converter methods (OBM, Q-BOP, etc.), top-bottom combined blown inert gas methods (LBE, LD-CB, etc.), top-bottom combined blown bottom-blown oxygen methods (KOBM, K-BOP, etc.), etc.
The service life of a bottom ventilating element of a combined blown converter is difficult to be synchronous with the furnace age, which is a technical problem of long service life of combined blown converter, the combined blown effect of the top-bottom combined blown converter is obviously poor in the later period of the converter service, mainly, the corrosion of the converter molten pool part is fast in the middle and later periods of the converter service, the bottom of the converter is forced to be repaired, the bottom blowing hole covers a slag layer, the repaired material is thick, the exposure degree of the bottom blowing hole is poor, the smoothness of bottom blown gas is difficult to ensure, even if an instrument of a converter bottom blowing pipeline displays gas flow, the gas actually blown by a bottom blowing gun does not enter the molten pool, but is scattered from a branch formed by a refractory material gap of the converter lining, the actual.
Aiming at the problem of poor effect of the combined blowing in the later period of the converter service, a plurality of steel enterprises start to attack the converter combined blowing technology, on one hand, the difficulty that the effect of the converter bottom blowing under weak stirring strength is difficult to control stably is solved by attacking the converter bottom blowing position, the gun-shaped optimized bottom blowing gun and the dynamic maintenance technology of the furnace lining, the bottom blowing mode optimization and the like, the stable control of the carbon oxygen deposit in the whole service of the converter is realized, and the carbon oxygen deposit can still be kept to be controlled stably even in the later period of the service of the converter; but the bottom blowing effect is still different from the bottom blowing effect under strong bottom blowing stirring; on the other hand, many steel enterprises use the technology of rapidly replacing bottom ventilation elements to achieve the synchronization of furnace life and re-blowing in reference to Japan steel works, on the premise of not changing the bottom blowing strength, the quantity of bottom blowing guns is adjusted, the quantity of original bottom blowing guns is adjusted to 4 from 12 or 8, the flow of single bottom blowing guns is increased, when a bottom blowing hole is covered by a slag layer or a bottom blowing spray gun is corroded to a certain degree, the heat exchange technology of the bottom blowing guns is adopted, the used spray gun is sealed, the bottom blowing guns are installed at open holes at other bottom blowing positions, and therefore the bottom blowing effect of the whole furnace service is guaranteed.
The on-line hot replacement technology of the bottom blowing ventilating element refers to the rapid integral replacement of the bottom blowing ventilating element in the hot state of the converter. The equipment mainly comprises a movable operation platform frame, a flange plate connecting system, a drilling system (comprising a motor control system, a drilling support, a guide rail and the like), a cooling water system and the like. When in heat exchange operation, the movable operation platform frame is placed on the operation platform of the converter, one side of the movable operation platform frame is close to the bottom of the converter, the movable operation platform frame is an operation platform for bottom blowing online heat exchange, the flange plate connects and fixes the drilling system at the bottom of the converter, the rotation of the drill cylinder and the drill bit of the motor is controlled, the drill cylinder and the drill bit system are driven to be pushed forwards on the guide rail, cooling water enters from the tail part of the drill cylinder and flows out from the drill bit to cool the operation of the drill bit.
The on-line hot replacement process of the bottom blowing ventilation element comprises the steps of tightly connecting and fixing replacement equipment to the position of the bottom ventilation element through a flange plate, introducing cooling water into a drill cylinder, starting a control motor, driving the drill cylinder to advance in a rotating mode by the motor, enabling the drill cylinder to be longer than the bottom of the furnace, enabling a drill bit to drill through refractory materials at the position of the bottom of the furnace, withdrawing the drill cylinder, and placing a new ventilation element into a drill hole to achieve the purpose of replacement.
However, in the process of bottom-blowing heat exchange, due to the error between the diameter of the drill and the diameter of the bottom-blowing spray gun, a gap of 1.0-2.0mm generally exists, if the problems of inaccurate positioning flange of constructors, inaccurate drilling operation and the like occur, the gap is larger than 2.0mm, the refractory material outside the bottom-blowing spray gun thermally expands due to the high temperature effect during the furnace baking, and if the thermal expansion of the bottom-blowing spray gun is not enough to enable the bottom-blowing spray gun to be tightly combined with the drilled hole, the risk of steel leakage still exists; and the condition that the installed bottom-blowing spray gun is not perpendicular to the furnace bottom can also occur, so that the bottom-blowing stirring flow field after the bottom-blowing element is subjected to heat replacement is not consistent with the designed bottom-blowing flow field, and the bottom-blowing effect is influenced.
Disclosure of Invention
The invention aims to provide a device for maintaining the gap between a nozzle and a brick cup after bottom blowing quick change, which aims to solve the problem that in the prior art, when a bottom blowing element is subjected to hot change, the gap between a bottom blowing spray gun and a brick cup is too large, the bottom blowing spray gun cannot be tightly combined with a drill hole due to insufficient thermal expansion of the bottom blowing spray gun, and the risk of steel leakage exists.
Another object of the present invention is to provide a method for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change.
In order to achieve the purpose, the invention adopts the technical scheme that: the utility model provides a device for maintaining nozzle and brick cup clearance behind bottom-blowing quick change, is including maintaining main part and bulldozing device, it includes the closed barrel of one end opening other end to maintain the main part, the open end of barrel is equipped with twist grip, safety shield and port in proper order and is equipped with the barrel screw thread, be equipped with a plurality of mud holes on the barrel wall of cylinder, bulldozing device includes that both ends are equipped with helicitic texture's bracing piece, and the bracing piece is hollow tubular structure, the one end of bracing piece be equipped with in proper order the boosting handle, with the seal closure of barrel screw thread looks adaptation, the other end of bracing piece is equipped with the push.
Further, still include belt cleaning device, belt cleaning device is including the hollow cylinder cleaning head that is equipped with brush and apopore, be equipped with the connection screw socket of being connected with the bracing piece on the cleaning head.
Furthermore, the hairbrushes and the water outlet holes are multiple and are arranged on the cleaning head in a staggered mode.
Further, the outer diameter of the cylinder is consistent with that of the converter bottom blowing spray gun.
Furthermore, the rotating handle and the boosting handle are respectively symmetrically arranged and are cylindrical.
A method for maintaining the gap between a nozzle and a brick cup after bottom blowing quick change comprises the following steps:
step 1) maintenance preparation: after slag splashing and slag pouring are finished during converter smelting, the converter is shaken to a position of minus 90 degrees, a bottom blowing quick change device is installed, a hole is drilled in the center of a bottom blowing brick cup, and after the converter bottom blowing quick change drilling is finished, a barrel is inserted into the hole of the bottom blowing brick cup;
step 2) filling fire clay: adding water into the corundum fire clay, stirring and uniformly mixing to prepare a maintenance material, loading the maintenance material into the cylinder, extruding the corundum fire clay to the outer wall of the cylinder through a pushing device, accumulating and discharging the clay, loading for multiple times, and repeatedly pushing until the corundum fire clay is distributed between the outer wall of the cylinder and the bottom blowing brick cup;
step 3), rotary trowelling: the cylinder body is driven to rotate through the rotation of the rotating handle, corundum fire clay between the outer wall of the cylinder body and the bottom blowing brick cup is leveled in a rotating mode, and the corundum fire clay is leveled on the inner wall of a hole of the bottom blowing brick cup;
step 4), installing a spray gun: after the barrel is drawn out, inserting the bottom blowing spray gun into a hole of the corundum fire clay with the inner wall being flattened, fixing the bottom blowing spray gun by using a flange, connecting the bottom blowing spray gun with a blowing pipeline, hoisting the mounting platform to a placing position, rocking the converter to a zero position, and preparing for baking and sintering;
step 5), baking and sintering: adding 0.5-1t of coke into the furnace in batches from an elevated bunker, splashing 10-20kg of kerosene onto 0.3-0.5t of wood and 10kg of rag, shaking the furnace to a waste steel adding position by using a converter, adding the kerosene from the furnace mouth at one time by using a waste steel bucket, and throwing an ignited torch into the furnace from the furnace mouth of the converter to finish ignition; the converter is shaken to a zero position, the oxygen lance is manually opened, the flow of the blown oxygen is 3000-;
step 5), cleaning: the barrel that will take out is placed by the water pipe, opens the seal closure, extracts the thrust unit through the boosting handle, unscrews the push pedal that the bracing piece head is connected, installs the cleaning head in the position of push pedal, passes through rotary joint at the bracing piece afterbody and connects the water pipe, inserts the cleaning head in barrel 1, covers the seal closure, opens water and begins to wash the barrel.
Further, Al in the corundum fire clay in the step 2)2O3The mass fraction of Cr is more than or equal to 80 percent2O3The mass fraction is more than or equal to 6.5 percent, and the volume density is more than or equal to 2.0g/cm3。
Further, when the corundum fire clay is leveled by rotating in the step 3), the cylinder body is rotated anticlockwise or clockwise by taking the center of the brick hole of the bottom blowing seat as the center, and the corundum fire clay is leveled by utilizing the outer wall of the cylinder body.
Further, the pressure of the cleaning water is 0.3-0.5Mpa during cleaning in the step 6), and the water flow is 5-20m3/h during cleaning.
The invention has the beneficial effects that: the gap between the nozzle and the brick cup after the bottom blowing quick change can be effectively maintained, the safety of the bottom blowing element after the bottom blowing element is subjected to the hot change is further improved, and the risk of steel leakage at the part of the bottom blowing element is greatly reduced; the condition that the installed bottom blowing spray gun is not perpendicular to the furnace bottom is avoided, the bottom blowing stirring flow field after the bottom blowing element is thermally replaced is ensured to be consistent with the designed bottom blowing flow field, and the bottom blowing effect is optimal; the local uneven position on the inner wall of the bottom-blown brick cup after drilling can be completely smoothed, and no interlayer or hole is generated.
Drawings
FIG. 1 is a schematic structural diagram of a device for maintaining the gap between a nozzle and a brick cup after bottom blowing quick change of the invention;
FIG. 2 is a schematic view of the cleaning apparatus of the present invention;
fig. 3 is a using state diagram of the device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change.
In the figure: 1. a barrel; 2. rotating the handle; 3. a mud outlet hole; 4. a safety barrier; 5. threading the cylinder; 6. pushing the plate; 7. a boost handle; 8. a rotary interface; 9. a water pipe; 10. supporting a tube; 11. sealing cover; 12. a connecting screw; 13. a water outlet hole; 14. a brush; 15. a cleaning head; 16. bottom blowing brick bases; 17. corundum fire clay.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
As shown in fig. 1 and 2, the device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change comprises a maintenance main body and a pushing device, wherein the maintenance main body comprises a barrel body 1 with an opening at one end and a closed end at the other end, the outer diameter of the barrel body 1 is consistent with that of a converter bottom blowing spray gun, the thickness of the barrel body is 3mm, the material is Q235B steel, after the gap between the bottom blowing spray gun and the bottom blowing brick cup is maintained, the inner wall of a repaired drilled hole can be ensured to be completely consistent with the outer diameter of a refractory material outside the bottom blowing spray gun, and after the bottom blowing spray gun is inserted and installed, the gap between the bottom blowing spray gun and the brick cup can be ensured to be less than 0.05 mm; the opening end of the barrel body 1 is sequentially provided with a rotating handle 2 and a safety baffle 4, a barrel body screw thread 5 is arranged at the port of the opening end of the barrel body 1, the barrel wall of the barrel body 1 is provided with a plurality of mud outlet holes 3, the safety baffle 4 is connected to the outer side of the barrel body 1 and is 50mm higher than the barrel body, and the distance from the rotating handle 2 is 100 mm; the diameter of the mud outlet hole 3 is 20mm, the pushing device comprises a support rod 10 with two ends provided with thread structures, the support rod 10 is of a hollow tubular structure, and a hollow channel is used as a cleaning water flow channel during cleaning; the utility model discloses a support rod, including bracing piece 10, barrel screw thread 5, sealing cover 11, sealing cover 10, the one end of bracing piece 10 is equipped with boosting handle 7 in proper order, and the screw thread of barrel screw thread 5 and the screw thread of sealing cover 11 are the same size supporting use, and sealing cover 11 center division has the diameter to be unanimous with the diameter of bracing piece 10, and the suit can be followed bracing piece 10 and reciprocated, screws up sealing cover 11 on barrel 1 when operating bracing piece 10, can prevent bracing piece 10 and push pedal 6 from taking out from barrel 1, the other end of bracing piece 10 is equipped with push pedal 6, and the diameter of push pedal 6 is unanimous with the diameter of barrel 1, and push pedal 6 installs the tip at bracing piece 10 and passes through connecting bolt and connect, twist grip 2 and boosting handle 7 bilateral symmetry respectively set up and are cylindrical, make things convenient for operating personnel to hold tightly and make power, and the symmetry setting helps operating personnel bilateral, the material is Q235B steel, the diameter is 20mm, and the length of a single side is 180 mm.
Still include belt cleaning device, belt cleaning device is including the hollow cylinder cleaning head 15 that is equipped with brush 14 and apopore 13, and the diameter is 50mm, brush 14 and apopore 13 are a plurality of and crisscross setting on cleaning head 15, are convenient for hydroenergy when wasing spills the barrel inner wall uniformly, and brush 14's length just reaches barrel 1's internal diameter department, and the brush can be sanitized and wash speed faster when the rotatory brush inner wall, and 14 mounting hole diameters of brush are 15mm, and 13 diameters of apopore are 10mm, be equipped with the connection screw thread 12 of being connected with bracing piece 10 on the cleaning head 15, connect screw thread 12 and the supporting use of bracing piece 10, and the screw thread size is unanimous, and the back is dismantled to the push pedal, and cleaning head 15 can be installed to bracing piece 10 with connection screw thread 12, and the hollow formation of bracing piece 10 washs the rivers flow path with cleaning head 15.
As shown in figure 3, after the converter bottom blowing quick-change drilling is finished, a cylinder 1 is inserted into a hole of a bottom blowing brick cup 16, corundum fire clay 17 which is uniformly mixed by adding water is filled into the cylinder 1, the corundum fire clay 17 is extruded to the outer wall of the cylinder 1 through an extruding device, the corundum fire clay 17 is repeatedly extruded after multiple times of loading, corundum fire clay 17 is fully distributed between the outer wall of the cylinder 1 and the bottom blowing brick cup 16, at the moment, the cylinder 1 is driven to rotate through the rotation of a rotating handle 2, the corundum fire clay 17 between the outer wall of the cylinder 1 and the bottom blowing brick cup 16 is leveled, the corundum fire clay 17 is leveled on the inner wall of a hole of the bottom blowing brick cup 16, then the cylinder 1 is drawn out, a bottom blowing spray gun is inserted into the hole of the corundum fire clay 17 whose inner wall is leveled and fixed by a flange, a bottom blowing spray gun and a blowing pipeline are connected, a mounting platform is lifted to a placing position, the converter is swung to a zero position, 0.5-1t is added into the converter in batches from a coke high position, 10-20kg kerosene, shaking the converter to a waste steel adding position, adding the waste steel from the converter mouth at one time by using a waste steel hopper, throwing the ignited fire handle from the converter mouth of the converter into the converter to finish ignition, shaking the converter to a zero position, manually turning on oxygen by an oxygen lance, manually adjusting the oxygen flow to ensure that the original magnesia carbon brick at the bottom of the converter, the repaired corundum fire clay and the refractory material outside the spray gun are tightly sintered at high temperature, adding molten iron for smelting after drying the converter, placing the extracted barrel 1 beside a water pipe 9, opening a sealing cover 11, the pushing device is pulled out by the boosting handle 7, the pushing plate 6 connected with the head part of the supporting rod 10 is unscrewed, install belt cleaning device in push pedal 6's position, pass through rotary joint 8 at the bracing piece 10 afterbody and connect water pipe 9, insert barrel 1 with cleaning head 15 in, cover closing cap 11, open water and begin to wash, the cleaning process drives cleaning head 15 rotation or front and back pull cleaning head 15 through boost handle 7 and makes the cleaning performance better.
The invention is suitable for a converter which adopts bottom blowing quick change and is 50-300 tons, and the sizes of all parts in the device can be adjusted according to the diameter of a bottom blowing spray gun under the condition of unchanged structure.
Example 1:
when the device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change is used for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change, the method specifically comprises the following steps:
the embodiment is suitable for a 70t top-bottom combined blown converter, after slag splashing and protection in converter smelting and slag pouring, the converter is shaken to a position of minus 90 degrees, a bottom blowing quick change device is installed, a hole is drilled in the center of a bottom blowing brick cup, after the bottom blowing quick change drilling of the converter is finished, the barrel 1 is inserted into the hole of the bottom blowing brick cup, corundum fire clay 17 which is uniformly mixed by adding water is filled into the barrel 1, and Al in the corundum fire clay 172O3Not more than 83.1% by mass of Cr2O3Has a mass fraction of 6.6% and a bulk density of 2.1g/cm3Extruding corundum fire clay 17 to the outer wall of a cylinder body 1 through a pushing device, loading for many times, repeatedly pushing, fully distributing corundum fire clay 17 between the outer wall of the cylinder body 1 and a bottom blowing brick cup 16, at the moment, driving the cylinder body 1 to rotate through rotation of a rotating handle 2, leveling the corundum fire clay 17 between the outer wall of the cylinder body 1 and the bottom blowing brick cup 16, leveling the corundum fire clay 17 on the inner wall of a hole of the bottom blowing brick cup 16, then drawing out the cylinder body 1, inserting a bottom blowing spray gun into the hole of the inner wall leveled corundum fire clay, fixing the corundum fire clay by using a flange, connecting the bottom blowing spray gun and a blowing pipeline, lifting a mounting platform to a placing position, swinging a converter to a zero position, adding 0.5t coke into the converter in batches from a high-position bin, splashing 10kg kerosene onto 0.3t wood and 10kg broken cloth, swinging the converter to a waste steel adding position, adding the waste steel hopper from a furnace mouth at one time, throwing an ignited torch from the furnace mouth to the furnace to finish ignition, the converter is shaken to the zero position, the oxygen lance is manually switched on, the oxygen flow is manually adjusted, and the oxygen flow is switched on and blown to 3000Nm3H, oxygen flow after ignition gradually increased to 8000Nm3The gun position is controlled according to 1.0m, the furnace baking time is 10min, the original magnesia carbon bricks at the furnace bottom, the repaired corundum fire clay and the refractory materials outside the spray gun are sintered tightly at high temperature, molten iron is added for smelting after the furnace baking, and the drawn cylinder body 1 is placed onBy 9 water pipes, open the closing cap 11, extract thrust unit through boosting handle 7, unscrew the push pedal 6 that the 10 heads of bracing piece are connected, at the position installation belt cleaning device of push pedal 6, pass through rotary joint 8 at the 10 afterbody of bracing piece and connect water pipe 9, insert barrel 1 with cleaning head 15 in, cover closing cap 11, open water and begin to wash, the cleaning process drives cleaning head 15 rotation or front and back pull cleaning head 15 through boosting handle 7 and makes the cleaning performance better.
The implementation result shows that after the gap between the bottom-blowing nozzle and the brick cup is maintained on a 70t top-bottom combined blown converter, no steel leakage phenomenon occurs at the bottom-blowing quick-change part in the whole service period of the converter, and no steel clamping phenomenon is found in the gap between the bottom-blowing nozzle and the brick cup when the service of the converter is finished and the magnesia carbon bricks in the converter are dismantled.
Example 2:
the embodiment is suitable for a 120t top-bottom combined blown converter, after slag splashing and protection in converter smelting and slag pouring, the converter is shaken to a position of minus 90 degrees, a bottom blowing quick change device is installed, a hole is drilled in the center of a bottom blowing brick cup, after the bottom blowing quick change drilling of the converter is finished, the barrel body 1 is inserted into the hole of the bottom blowing brick cup, corundum fire clay which is uniformly mixed by adding water is filled into the barrel body 1, and Al in the corundum fire clay is poured2O3Is less than 84.6 percent, Cr2O3Has a mass fraction of 6.66% and a bulk density of 2.07g/cm3Extruding corundum fire clay to the outer wall of a cylinder body 1 through a pushing device, loading for many times, repeatedly pushing, fully distributing corundum fire clay between the outer wall of the cylinder body 1 and a bottom blowing brick cup, at the moment, driving the cylinder body 1 to rotate through rotation of a rotating handle 2, leveling the corundum fire clay between the outer wall of the cylinder body 1 and the bottom blowing brick cup, leveling the corundum fire clay on the inner wall of a hole of the bottom blowing brick cup, then drawing out the cylinder body 1, inserting a bottom blowing spray gun into the hole of the leveled corundum fire clay on the inner wall, fixing the bottom blowing spray gun by a flange, connecting a bottom blowing spray gun and a blowing pipeline, lifting a mounting platform to a placing position, swinging a converter to a zero position, adding 0.8t coke into the converter in batches from a high-position bin, spraying 15kg of kerosene onto 0.4t of wood and 10kg of cloth, swinging the converter to a waste steel adding position, adding the waste steel hopper from a furnace mouth at one time, throwing an ignited fire handle into the converter from the furnace mouth to the furnace to finish, the converter is shaken to the zero position, and the oxygen lance is manually operatedOxygen is turned on, the oxygen flow is manually adjusted, and the oxygen blowing flow is 3500Nm3H, oxygen flow after ignition was gradually increased to 9000Nm3The gun position is controlled according to 1.8m, the furnace baking time is 30min, the original magnesia carbon bricks at the furnace bottom, the repaired corundum fire clay and the refractory materials outside the spray gun are sintered tightly at high temperature, molten iron is added for smelting after the furnace baking, the drawn cylinder body 1 is placed beside the water pipe 9, the sealing cover 11 is opened, the pushing device is pulled out through the boosting handle 7, the push plate 6 connected with the head of the support rod 10 is unscrewed, the cleaning device is installed at the position of the push plate 6, the tail of the support rod 10 is connected with the water pipe 9 through the rotary joint 8, the cleaning head 15 is inserted into the cylinder body 1, the sealing cover 11 is covered, water is opened for cleaning, and the cleaning process drives the cleaning head 15 to rotate through the boosting handle 7 or pulls the cleaning head 15 back and forth so that the cleaning effect is better.
The implementation result shows that after the gap between the bottom-blowing nozzle and the brick cup is maintained on the 120t top-bottom combined blown converter, no steel leakage phenomenon occurs at the bottom-blowing quick-change part in the whole service period of the converter, and no steel clamping phenomenon is found in the gap between the bottom-blowing nozzle and the brick cup when the magnesia carbon brick in the converter is dismantled after the service of the converter is finished.
Example 3:
the embodiment is suitable for a 200t top-bottom combined blown converter, after the converter smelting slag splashing protection is finished and slag pouring is finished, the converter is shaken to a position of minus 90 degrees, a bottom blowing quick change device is installed, a hole is drilled at the center of a bottom blowing brick cup, after the converter bottom blowing quick change drilling is finished, the barrel body 1 is inserted into the hole of the bottom blowing brick cup, corundum fire clay which is uniformly mixed by adding water is filled into the barrel body 1, and Al in the corundum fire clay is poured2O3Not more than 85.9% by mass of Cr2O3Has a mass fraction of 6.7% and a bulk density of 2.22g/cm3The corundum fire clay is extruded to the outer wall of the barrel body 1 through the pushing device, the corundum fire clay is repeatedly pushed and pressed through multiple charging, the corundum fire clay is fully distributed between the outer wall of the barrel body 1 and the bottom blowing brick cup, the barrel body 1 is driven to rotate through the rotation of the rotating handle 2 at the moment, the corundum fire clay between the outer wall of the barrel body 1 and the bottom blowing brick cup is leveled, the corundum fire clay is leveled on the inner wall of the hole of the bottom blowing brick cup, the mounting platform is lifted to the placing position, the converter is shaken to the zero position, 0.5t coke is added into the converter in batches from a high-position storage bin, 20kg kerosene is splashed to 0.5t woodThe method comprises the steps of breaking cloth by 10kg, shaking a converter to a scrap adding position, adding the waste into the converter from a converter mouth at one time by using a scrap hopper, throwing an ignited fire handle into the converter from the converter mouth of the converter to finish ignition, shaking the converter to a zero position, manually starting oxygen by an oxygen lance, manually adjusting oxygen flow, wherein the blowing oxygen flow is 4000Nm3H, oxygen flow after ignition is gradually increased to 10000Nm3The gun position is controlled according to 3.0m, the baking time is 40min, the original magnesia carbon bricks at the bottom of the furnace, the repaired corundum fire clay and the refractory materials outside the spray gun are sintered tightly at high temperature, molten iron is added for smelting after the furnace is baked, the drawn cylinder body 1 is placed beside the water pipe 9, the sealing cover 11 is opened, the pushing device is pulled out through the boosting handle 7, the push plate 6 connected with the head of the support rod 10 is unscrewed, the cleaning device is installed at the position of the push plate 6, the tail of the support rod 10 is connected with the water pipe 9 through the rotary joint 8, the cleaning head 15 is inserted into the cylinder body 1, the sealing cover 11 is covered, water is opened for cleaning, and the cleaning effect is better because the boosting handle 7 is used for driving the cleaning head 15 to rotate or drawing the cleaning head 15 back and forth during.
Then the cylinder body 1 is drawn out, the bottom blowing spray gun is inserted into a hole with the inner wall flattened with corundum fire clay, the bottom blowing spray gun and a blowing pipeline are connected, the drawn cylinder body 1 is placed beside a water pipe, a sealing cover 11 is opened, a pushing device is pulled out through a boosting handle 7, a push plate 6 connected with the head of a support rod 10 is unscrewed, a cleaning head 15 is installed at the position of the push plate 6, the tail of the support rod 10 is connected with the water pipe 9 through a rotary joint 8, the pushing device is inserted into the cylinder body 1, the sealing cover 11 is covered, water is opened for cleaning, the cleaning head 15 is driven to rotate by the boosting handle 7 in the cleaning process or the cleaning head 15 is pulled back and forth to make the cleaning effect better, then the furnace is dried, 0.5t coke is added into the furnace in batches from a high-level kerosene bin during the furnace drying, 20kg of coke is splashed onto 0.5t of wood and 10kg of broken cloth, other prepared materials are added from, then ignition is carried out, the oxygen lance is manually opened with oxygen flow of 4000Nm3H, oxygen flow after ignition is gradually increased to 10000Nm3And h, controlling the gun position according to 3.0m, baking for 40min, and adding iron and scrap steel for smelting after the baking is finished.
The implementation result shows that after the gap between the bottom-blowing nozzle and the brick cup is maintained on a 200t top-bottom combined blown converter, no steel leakage phenomenon occurs at the bottom-blowing quick-change part in the whole service period of the converter, and no steel clamping phenomenon is found in the gap between the bottom-blowing nozzle and the brick cup when the magnesia carbon brick in the converter is dismantled after the service of the converter is finished.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (9)
1. The utility model provides a device in nozzle and brick cup clearance after maintaining bottom blowing quick change which characterized in that: including maintaining main part and thrust unit, it includes one end opening other end confined barrel (1) to maintain the main part, the open end of barrel (1) is equipped with twist grip (2), safety shield (4) and port in proper order and is equipped with barrel screw (5), be equipped with a plurality of mud holes (3) on barrel (1) section of thick bamboo wall, thrust unit includes that both ends are equipped with threaded structure's bracing piece (10), the one end of bracing piece (10) is equipped with boosting handle (7) in proper order, with sealing cover (11) of barrel screw (5) looks adaptation, the other end of bracing piece (10) is equipped with push pedal (6).
2. The device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 1, wherein: still include belt cleaning device, belt cleaning device is including hollow cylinder cleaning head (15) that are equipped with brush (14) and apopore (13), be equipped with on cleaning head (15) and be connected screw socket (12) of being connected with bracing piece (10).
3. The device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 2, wherein: the hairbrushes (14) and the water outlet holes (13) are multiple and are arranged on the cleaning head (15) in a staggered mode.
4. The device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 1, wherein: the outer diameter of the cylinder body (1) is consistent with that of a converter bottom blowing spray gun.
5. The device for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 1, wherein: the rotating handle (2) and the boosting handle (7) are respectively symmetrically arranged and are cylindrical.
6. The method for maintaining the gap between the bottom-blowing quick-change nozzle and the brick cup by using the device for maintaining the gap between the bottom-blowing quick-change nozzle and the brick cup as claimed in any one of claims 1 to 5, is characterized by comprising the following steps:
step 1) maintenance preparation: after slag splashing and slag pouring are finished during converter smelting, the converter is shaken to a position of minus 90 degrees, a bottom blowing quick change device is installed, a hole is drilled in the center of a bottom blowing brick cup, and after the converter bottom blowing quick change drilling is finished, the barrel (1) is inserted into the hole of the bottom blowing brick cup;
step 2) filling fire clay: adding water into the corundum fire clay, stirring and uniformly mixing to prepare a maintenance material, filling the maintenance material into the barrel (1), extruding the corundum fire clay to the outer wall of the barrel (1) through a pushing device, piling up and discharging the corundum fire clay, wherein multiple times of charging are needed in the process of extruding the corundum fire clay, and repeatedly pushing until the corundum fire clay is distributed between the outer wall of the barrel (1) and a bottom blowing brick cup;
step 3), rotary trowelling: the barrel (1) is driven to rotate by the rotation of the rotating handle (2), corundum fire clay between the outer wall of the barrel (1) and the bottom blowing brick cup is floated in a rotating way, and the corundum fire clay is floated on the inner wall of the hole of the bottom blowing brick cup;
step 4), installing a spray gun: after the barrel body (1) is drawn out, inserting the bottom blowing spray gun into a hole of corundum fire clay with a flattened inner wall, fixing the corundum fire clay by using a flange, connecting the bottom blowing spray gun and a blowing pipeline, hoisting the mounting platform to a placing position, shaking the converter to a zero position, and preparing for baking and sintering;
step 5), baking and sintering: adding 0.5-1t of coke into the furnace in batches from an elevated bunker, splashing 10-20kg of kerosene onto 0.3-0.5t of wood and 10kg of rag, shaking the furnace to a waste steel adding position by using a converter, adding the kerosene from the furnace mouth at one time by using a waste steel bucket, and throwing an ignited torch into the furnace from the furnace mouth of the converter to finish ignition; the converter is shaken to a zero position, the oxygen lance is manually opened, the flow of the blown oxygen is 3000-;
step 5), cleaning: the method comprises the steps of placing a drawn barrel (1) beside a water pipe (9), opening a sealing cover (11), drawing out a pushing device through a boosting handle (7), unscrewing a push plate (6) connected with the head of a support rod (10), installing a cleaning head (15) at the position of the push plate (6), connecting the tail of the support rod (10) with the water pipe (9) through a rotary joint (8), inserting the cleaning head (15) into the barrel (1), covering the sealing cover (11), and opening water to start cleaning the barrel (1).
7. The method for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 6, wherein: al in the corundum fire clay in the step 2)2O3The mass fraction of Cr is more than or equal to 80 percent2O3The mass fraction is more than or equal to 6.5 percent, and the volume density is more than or equal to 2.0g/cm3。
8. The method for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 6, wherein: and 3) during the rotary smoothing in the step 3), the cylinder body is rotated anticlockwise or clockwise by taking the center of the bottom blowing brick cup hole as the center, and the corundum fire clay is smoothed by utilizing the outer wall of the cylinder body.
9. The method for maintaining the gap between the nozzle and the brick cup after the bottom blowing quick change as claimed in claim 6, wherein: the pressure of the cleaning water is 0.3-0.5Mpa and the water flow is 5-20m during cleaning in the step 6)3/h。
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910995808.0A CN110669897A (en) | 2019-10-18 | 2019-10-18 | Device and method for maintaining gap between nozzle and brick cup after bottom blowing quick change |
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| CN201910995808.0A CN110669897A (en) | 2019-10-18 | 2019-10-18 | Device and method for maintaining gap between nozzle and brick cup after bottom blowing quick change |
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| CN110669897A true CN110669897A (en) | 2020-01-10 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112319425A (en) * | 2020-11-19 | 2021-02-05 | 郑州宇通重工有限公司 | Dual-purpose vehicle can initiatively blast lift frame and dual-purpose vehicle |
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| CN211079221U (en) * | 2019-10-18 | 2020-07-24 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Device for maintaining gap between bottom-blowing quick-change nozzle and brick cup |
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| KR20050058086A (en) * | 2003-12-11 | 2005-06-16 | 주식회사 포스코 | An apparatus for closing urgently the tap holes of a blast furnace |
| CN208643557U (en) * | 2018-06-30 | 2019-03-26 | 禹州市新光铸造有限公司 | A kind of cleaning device for inner wall of pipeline |
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| CN112319425A (en) * | 2020-11-19 | 2021-02-05 | 郑州宇通重工有限公司 | Dual-purpose vehicle can initiatively blast lift frame and dual-purpose vehicle |
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Application publication date: 20200110 |