CN116640908A - Penetration-resistant RH refining furnace dip pipe and application thereof - Google Patents
Penetration-resistant RH refining furnace dip pipe and application thereof Download PDFInfo
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- CN116640908A CN116640908A CN202310670565.XA CN202310670565A CN116640908A CN 116640908 A CN116640908 A CN 116640908A CN 202310670565 A CN202310670565 A CN 202310670565A CN 116640908 A CN116640908 A CN 116640908A
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- 238000007670 refining Methods 0.000 title claims abstract description 16
- 230000035515 penetration Effects 0.000 title claims abstract description 15
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 47
- 239000010959 steel Substances 0.000 claims abstract description 47
- 239000011449 brick Substances 0.000 claims abstract description 36
- 239000000463 material Substances 0.000 claims description 33
- 239000002994 raw material Substances 0.000 claims description 18
- 238000005266 casting Methods 0.000 claims description 13
- 239000011230 binding agent Substances 0.000 claims description 12
- 239000003963 antioxidant agent Substances 0.000 claims description 9
- 230000003078 antioxidant effect Effects 0.000 claims description 9
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical group [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 239000004568 cement Substances 0.000 claims description 3
- 229910052751 metal Inorganic materials 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- XFWJKVMFIVXPKK-UHFFFAOYSA-N calcium;oxido(oxo)alumane Chemical compound [Ca+2].[O-][Al]=O.[O-][Al]=O XFWJKVMFIVXPKK-UHFFFAOYSA-N 0.000 claims description 2
- 210000001503 joint Anatomy 0.000 abstract description 22
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 14
- 229910052593 corundum Inorganic materials 0.000 description 13
- 239000010431 corundum Substances 0.000 description 13
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 10
- 238000007598 dipping method Methods 0.000 description 8
- 239000000395 magnesium oxide Substances 0.000 description 7
- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 description 6
- 238000010276 construction Methods 0.000 description 6
- 238000001035 drying Methods 0.000 description 6
- 230000000149 penetrating effect Effects 0.000 description 6
- 230000035939 shock Effects 0.000 description 6
- 238000003466 welding Methods 0.000 description 6
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 5
- 230000008901 benefit Effects 0.000 description 5
- 239000013078 crystal Substances 0.000 description 5
- 230000003628 erosive effect Effects 0.000 description 5
- 239000000843 powder Substances 0.000 description 5
- 229910052596 spinel Inorganic materials 0.000 description 5
- 239000011029 spinel Substances 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 4
- 238000002156 mixing Methods 0.000 description 4
- 238000007654 immersion Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 238000009991 scouring Methods 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 230000036571 hydration Effects 0.000 description 2
- 238000006703 hydration reaction Methods 0.000 description 2
- 238000002844 melting Methods 0.000 description 2
- 230000008018 melting Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000033764 rhythmic process Effects 0.000 description 2
- 239000002893 slag Substances 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- 238000003860 storage Methods 0.000 description 2
- 229910018072 Al 2 O 3 Inorganic materials 0.000 description 1
- 238000003723 Smelting Methods 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- CAVCGVPGBKGDTG-UHFFFAOYSA-N alumanylidynemethyl(alumanylidynemethylalumanylidenemethylidene)alumane Chemical compound [Al]#C[Al]=C=[Al]C#[Al] CAVCGVPGBKGDTG-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000007767 bonding agent Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000005261 decarburization Methods 0.000 description 1
- 238000007872 degassing Methods 0.000 description 1
- 238000006356 dehydrogenation reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- KZHJGOXRZJKJNY-UHFFFAOYSA-N dioxosilane;oxo(oxoalumanyloxy)alumane Chemical compound O=[Si]=O.O=[Si]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O.O=[Al]O[Al]=O KZHJGOXRZJKJNY-UHFFFAOYSA-N 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000007580 dry-mixing Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 239000007789 gas Substances 0.000 description 1
- 230000036541 health Effects 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 230000002401 inhibitory effect Effects 0.000 description 1
- 235000013372 meat Nutrition 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052863 mullite Inorganic materials 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000004321 preservation Methods 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 239000011819 refractory material Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 229910002076 stabilized zirconia Inorganic materials 0.000 description 1
- 238000009628 steelmaking Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
- 238000009489 vacuum treatment Methods 0.000 description 1
- RUDFQVOCFDJEEF-UHFFFAOYSA-N yttrium(III) oxide Inorganic materials [O-2].[O-2].[O-2].[Y+3].[Y+3] RUDFQVOCFDJEEF-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/045—Bricks for lining cylindrical bodies, e.g. skids, tubes
-
- 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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F27—FURNACES; KILNS; OVENS; RETORTS
- F27D—DETAILS OR ACCESSORIES OF FURNACES, KILNS, OVENS, OR RETORTS, IN SO FAR AS THEY ARE OF KINDS OCCURRING IN MORE THAN ONE KIND OF FURNACE
- F27D1/00—Casings; Linings; Walls; Roofs
- F27D1/04—Casings; Linings; Walls; Roofs characterised by the form, e.g. shape of the bricks or blocks used
- F27D1/045—Bricks for lining cylindrical bodies, e.g. skids, tubes
- F27D2001/047—Lining of cylindrical vessels
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Treatment Of Steel In Its Molten State (AREA)
Abstract
The invention discloses an RH refining furnace dip pipe capable of preventing steel penetration, wherein a butt joint surface of a circulating pipe and a dip pipe lining brick and a butt joint flange of a steel structure are subjected to staggered joint masonry.
Description
Technical Field
The invention belongs to the technical field of vacuum smelting, and particularly relates to an RH refining furnace dip pipe capable of preventing steel penetration and application thereof.
Background
In recent decades, with the continuous development of the steelmaking industry, the RH external refining technology has greatly developed, and by applying the vacuum circulation degassing principle, harmful gases such as hydrogen, nitrogen and the like contained in molten steel are removed, and the carbon content is reduced, so that the purity of the molten steel is further improved, and the quality of the molten steel is ensured.
The technology is continuously mature, the operating environment and the use requirement of the RH furnace are also more and more strict, the original single dehydrogenation function is developed to the existing multiple use functions such as decarburization, temperature compensation, component adjustment, alloying treatment and the like, along with the more and more diversified use functions, the single-heat vacuum treatment time of the RH refining furnace is also improved, so that the steel passing time and the steel passing amount of the dip pipe and the circulating pipe are also increased, the original 15min is improved to 40min, the steel passing amount is improved by 1.67 times, the use quality of the whole RH furnace is influenced, the service life of the dip pipe is reduced, and the use rhythm of the dip pipe is influenced because the conventional design scheme is that the upper surface of the dip pipe, the lower surface of the circulating pipe and the flanges of a groove shell are in the same horizontal plane, through seams are formed, steel binding or air suction is formed on the butt joint surfaces due to the problems such as the quality problems of lining bricks, the butt joint quality problems, the flange welding quality problems and the like, and the like in the continuous use, the steel binding area is increased, and finally the steel passing through accidents are caused by passing through the flanges from the butt joint positions, the use quality is reduced, and the service life of the dip pipe is influenced.
Therefore, how to provide an RH refining furnace dip pipe capable of preventing steel penetration is a problem to be solved.
Disclosure of Invention
In view of the above, the invention provides the penetration-resistant RH refining furnace dip pipe and the application thereof, which are used for carrying out staggered joint masonry on the butt joint surface and the flange surface, and blocking by adopting corundum self-flowing material, so that the penetration-resistant RH refining furnace dip pipe can not cause steel penetration accidents even if the flange welding quality problem occurs or the butt joint surface of the dip pipe and the circulating pipe is pricked with steel, and the safety use performance of the RH furnace is improved.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the utility model provides a prevent RH refining furnace dip pipe of steel, the joint face of circulation pipe and dip pipe lining brick and the butt flange of steel construction carries out the staggered joint and builds.
Preferably, the butt joint surface of the circulation pipe and the immersion pipe lining brick is 50-100mm higher than the butt joint flange.
Preferably, the butt joint surface of the circulation pipe and the immersion pipe lining brick is 100mm higher than the butt joint flange.
Preferably, the height of the circulation pipe is shortened by 100mm.
According to the invention, the upper surface of the lining brick of the dipping pipe protrudes out of the flange surface by 100mm, the total height of the circulating pipe is shortened by 100mm, the position of the structural flange surface is unchanged, the corundum self-flowing material is filled outside the lining brick, so that the butt joint surface and the flange surface are subjected to staggered masonry, and meanwhile, the corundum self-flowing material is blocked, so that steel penetration accidents are not caused even if the welding quality problem of the flange occurs or steel is pricked at the butt joint surface of the dipping pipe and the circulating pipe, and the safety use performance of the RH furnace is improved.
Preferably, the dip tube further comprises a self-flowing material and an outer layer casting material.
Preferably, the impregnated tube lining brick comprises the following raw materials in percentage by mass: mgO81-85%, al 2 O 3 10-12%, antioxidant 3-4% and binder 2-3%.
Preferably, the impregnated tube lining brick is made of unburned magnesia spinel lining brick materials, and comprises the following raw materials in parts by weight: 68-80 parts of large-crystal magnesia granularity material, 8-12 parts of 98 large-crystal magnesia powder, 2.5-3 parts of bonding agent, 5-6 parts of antioxidant metal aluminum powder, 1.5-2.5 parts of yttrium-stabilized zirconia and 7-10 parts of alumina powder.
The MgO content of the large-crystal fused magnesia is more than or equal to 98%, and the large-crystal fused magnesia has large primary crystal grains and good permeation resistance and erosion resistance; the binder is phenolic resin with carbon residue more than or equal to 40%, the phenolic resin is formed by a plurality of carbon atoms, when the phenolic resin is sintered at high temperature, the phenolic resin forms powerful carbon binding characteristics, and meanwhile, compared with the traditional binder tar and asphalt, the phenolic resin has the characteristics of high thermosetting property, high drying strength, high fixed carbon rate, small environmental pollution and the like; antioxidant: the metal aluminum powder is selected from powder with the content of elemental aluminum being more than or equal to 98 percent, and the aluminum powder can chemically react with residual carbon in the resin at a high temperature state to produce aluminum carbide which is contained on the surface of the lining brick to protect the infiltration and corrosion of slag; the stable zirconia is selected and used, the zirconia content is more than or equal to 90 percent, the yttria content is more than or equal to 7 percent, and the high-temperature-resistant composite material has good thermal shock resistance, high toughness, bursting resistance, high temperature resistance, good chemical stability and the like; alumina micropowder: alumina micropowder with alumina content more than or equal to 99% and granularity less than or equal to 5 mu is selected, so that the lining brick is helpful to be sintered in a high-temperature state, and meanwhile, the alumina micropowder is reflected with magnesia to form in-situ magnesia-alumina spinel, so that the alumina spinel has good erosion resistance and thermal shock stability improvement.
After being pressed and molded by a 1200-1600t friction brick press, the impregnated tube lining brick is dried and molded by a 150-200 ℃ drying kiln, has good high-temperature performances such as thermal shock stability, scouring resistance, erosion resistance and the like, can replace the traditional magnesia-chrome brick, and has certain environmental protection advantages.
Preferably, the antioxidant is aluminum metal powder.
Preferably, the binder is a phenolic resin.
Preferably, the self-flowing material comprises the following raw materials in percentage by mass: al (Al) 2 O 3 90-91%, mgO2-3.5%, antioxidant 1.5-2.5% and binder 4.5-5.5%.
The gap between the impregnated tube lining brick and the steel structure and between the circulating tube lining brick and the tank shell is generally about 25-35mm, corundum self-flowing material is adopted for filling, plate-shaped corundum with good thermal shock stability is selected as aggregate, the hydration speed of the binding agent is high, a high-temperature phase CA6 is easy to form, the material has good construction fluidity, good high-temperature strength and high volume density, the gap can be effectively filled, and the circulating tube and the impregnated tube lining brick are fixed, so that displacement is prevented.
Preferably, the outer layer castable comprises the following raw materials in percentage by mass: al (Al) 2 O 3 94.5-96%, caO1-2.5% and MgO2-3%.
Preferably, the outer layer castable comprises the following raw materials in percentage: 61-70% of plate-shaped corundum, 15-16% of sintered spinel, 5% of alumina micropowder, 6-14% of fused zirconia mullite and 4% of cement.
The inventionThe bright plate corundum is Al 2 O 3 The content is more than or equal to 99 percent, and has the advantages of high purity, high melting point, large grain hardness, good wear resistance and the like; the binding agent adopts pure calcium aluminate cement, has high hydration speed, is easy to form a high-temperature phase CA6, and has good high-temperature performance; the alumina micro powder adopts a mode of compounding a single peak and a double peak to achieve a tighter stacking effect, so that the castable is more compact, and the anti-scouring capability of the material body is improved; the magnesia-alumina spinel micropowder has the granularity of 5-10 mu, and has good thermal shock stability, permeation resistance, erosion resistance and other high-temperature properties; stainless steel fiber: the stainless steel fiber has the characteristics of high melting point, high strength and the like, can improve the strength and the tenacious of a casting material blank body, and is beneficial to inhibiting the formation of cracks of the casting material body.
The outer layer casting material of the dipping pipe plays a role in protecting a steel structure and lining bricks, molten steel is continuously and circularly rolled under the actions of an RH vacuum system and bottom blowing, and the outer layer casting material of the dipping pipe is subjected to severe scouring and steel slag erosion, meanwhile, due to alternate use of cold and hot of the dipping pipe, the outer layer casting material is required to have excellent thermal shock stability.
Use of a dip tube as described above in an RH refining furnace.
Compared with the prior art, the invention has the following beneficial effects:
1. the scheme of the invention effectively reduces the risk of steel penetration of the tank body, stabilizes the production rhythm and improves the safety production coefficient;
2. the scheme of the invention reduces the consumption of the refractory material, reduces the overall contractual cost and improves the economic benefit of enterprises;
3. the scheme of the invention has the same process flow as the traditional construction scheme, and is not complicated.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required to be used in the embodiments or the description of the prior art will be briefly described below, and it is obvious that the drawings in the following description are only embodiments of the present invention, and that other drawings can be obtained according to the provided drawings without inventive effort for a person skilled in the art.
FIG. 1 is a diagram showing a comparison of the structure of the present invention with a conventional structure, A being the conventional structure, and B being the structure of the present invention;
wherein, 1-circulation pipe, 2-self-circulation material, 3-steel structure, 4-dip pipe and circulation pipe butt joint, 5-dip pipe and steel structure butt flange, 6-dip pipe lining brick, 7-dip pipe outer layer casting material.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Example 1
The preparation method of the penetration-resistant steel RH refining furnace dip pipe specifically comprises the following steps:
1. preparation before work
1) And (3) batching: confirming whether the raw material identification and the index are qualified or not, carrying out teaching balance before batching, carrying out batching tolerance + -0.5 kg, carrying out premixing treatment on the raw material mixture ratio of the impregnated tube lining brick (see data in table 1), the raw material mixture ratio of the outer layer castable (see data in table 2) and the raw material mixture ratio of the self-flowing material, wherein the premixing time is more than or equal to 25 minutes, the storage time of the finished product material is less than or equal to 72 hours, and the storage temperature is 25-35 ℃;
2) And (5) die filling and assembling: confirming the integrity of the mold, namely that slurry leakage exists and bolts are loosened;
3) Mixing: putting the material of the impregnated tube lining bricks into mixing equipment, adding 4.5% water for wet mixing for 3-4 minutes, and discharging and vibrating for molding;
4) Vibration molding: putting the mixed pug into a mould for vibration forming, wherein the vibration cleaning time is more than or equal to 3 minutes, then putting the pug into a horizontal position for curing, wherein the curing temperature is 25-40 ℃, the curing time in the mould is 10-15 hours, and the curing time outside the mould is more than or equal to 240 hours, and then drying in a kiln;
5) And (3) drying: putting the dipping pipe reaching the life-preserving period into a drying kiln, and drying at 380 ℃ for more than or equal to 98 hours
2. Dip tube butt joint
1) The surfaces of the impregnated tube lining bricks and the circulating pipes are treated cleanly and tidily without impurities, the circulating pipes are fallen on the upper surfaces of the impregnated tube lining bricks, and the inner holes are required to be concentric;
2) The joint surface of the impregnated tube lining brick and the circulating pipe is required to be laid dry;
3) Slowly lifting the impregnated tube lining bricks by using a lifting vehicle, and completely attaching the flange surfaces of the impregnated tube lining bricks to the flanges of the tank body; the upper surface of the impregnated tube lining brick is exposed out of the flange surface by 100mm, the total height of the circulating pipe is shortened by 100mm, and the position of the structural flange surface is unchanged;
4) The whole ring of the flange butt joint is continuously fully welded for more than 3 times by adopting 506 welding rods, sand holes cannot exist, and welding meat is full;
5) Pouring corundum self-flowing material, wherein the corundum self-flowing material comprises the following components in percentage by mass: al (Al) 2 O 3 90-91%, mgO2-3.5%, antioxidant 1.5-2.5% and binder 4.5-5.5%;
3. construction of corundum castable for circulation pipe
1) After the positions of the impregnated tube lining bricks and the circulating tube are fixed, pouring construction of the circulating tube corundum castable is carried out;
2) Firstly, pouring the castable into a stirrer, dry-mixing for 2-3 minutes, and then wet-mixing for 3-4 minutes, wherein the water adding amount is about 8-9%;
3) After the castable is stirred by adding water, the castable is used within 30 minutes, and construction cannot be interrupted at will in the middle;
4) Pouring materials sequentially during pouring, and then vibrating by using an inserted vibrating rod. When the vibrating rod is used, the rear part of the vibrating rod is started to be inserted into the casting material, and the vibrating rod is required to be inserted directly and pulled out quickly during vibration;
5) And (3) carrying out natural health preservation for more than or equal to 24 hours after casting.
As shown in figure 1, in order to distinguish the structure of the invention from the structure of the traditional process, the invention has the advantages that the upper surface of the lining brick of the dipping pipe protrudes out of the flange surface by 100mm through the optimized design scheme, the total height of the circulating pipe is shortened by 100mm, the position of the flange surface of the structure is unchanged, the corundum self-flowing material is filled outside the lining brick, thus the butt joint surface and the flange surface are subjected to staggered joint masonry, and meanwhile, the corundum self-flowing material is adopted for blocking, so that steel penetration accidents are not caused even if the problem of flange welding quality occurs or steel is pricked on the butt joint surface of the dipping pipe and the circulating pipe, and the safety use performance of the RH furnace is improved.
Example 2
Raw material ratios of the impregnated tube lining bricks (see data in table 1), raw material ratios of the outer layer casting materials (see data in table 2), and other steps and parameters were exactly the same as those in example 1.
Example 3
Raw material ratios of the impregnated tube lining bricks (see data in table 1), raw material ratios of the outer layer casting materials (see data in table 2), and other steps and parameters were exactly the same as those in example 1.
Table 1 raw material ratios of impregnated tube lining tiles
Table 2 raw material ratios of outer layer castable
Application example
Taking a 210t RH furnace in a large steel factory in Hunan as an example, the use history of the factory for more than 20 years exists, the butt joint surface of an immersion pipe and a circulation pipe and the butt joint surface of a flange are designed on the same plane, the steel penetrating proportion is calculated to be about 0.375% after 2 years of use, but the steel penetrating proportion is about 60% of the total steel penetrating proportion at the butt joint surface, after the design mode is adjusted, the steel penetrating proportion is about 0.125%, and the steel penetrating proportion is about 15% of the total steel penetrating proportion due to the suction and steel binding of the butt joint surface, so that the forward practical performance of the design scheme of the embodiment 1 is reduced by about 45%, a certain economic benefit can be brought to enterprises, and more importantly, the safety, continuity and stable production capacity of a user unit is improved.
The various embodiments are described in a progressive manner, each embodiment focusing on differences from the other embodiments, and identical and similar parts between the various embodiments are sufficient to be seen with each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. An RH refining furnace dip pipe for preventing steel penetration is characterized in that joint surfaces of a circulating pipe and dip pipe lining bricks and joint flanges of a steel structure are subjected to staggered joint masonry.
2. An anti-penetration steel RH finery dip tube according to claim 1 wherein the interface of the circulation tube and the dip tube lining brick is 50-100mm above the interface flange.
3. An anti-penetration steel RH finery dip tube according to claim 2 wherein the interface of the dip tube and the dip tube liner is 100mm above the interface flange.
4. An anti-penetration steel RH finery dip tube according to claim 1 further comprising a self-flowing material and an outer layer casting material.
5. The penetration-resistant steel RH refining furnace dip tube of claim 1 wherein the dip tube lining brick comprises the following raw materials in mass percent: mgO81-85%, al 2 O 3 10-12%, antioxidant 3-4% and binder 2-3%.
6. An anti-penetration steel RH finery dip tube according to claim 5 wherein said antioxidant is metal aluminum powder and said binder is phenolic resin.
7. An anti-penetration steel RH finery dip tube according to claim 4 wherein said self-flowing material comprises the following raw materials in mass percent: al (Al) 2 O 3 90-91%, mgO2-3.5%, antioxidant 1.5-2.5% and binder 4.5-5.5%.
8. The penetration-resistant steel RH refining furnace dip pipe of claim 4, wherein the outer layer casting material comprises the following raw materials in percentage by mass: al (Al) 2 O 3 94.5-96%, caO1-2.5% and MgO2-3%.
9. An anti-penetration steel RH finery dip tube according to claim 8 wherein said binder is a pure calcium aluminate cement.
10. Use of the dip tube according to any one of claims 1-9 in an RH refining furnace.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310670565.XA CN116640908A (en) | 2023-06-07 | 2023-06-07 | Penetration-resistant RH refining furnace dip pipe and application thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310670565.XA CN116640908A (en) | 2023-06-07 | 2023-06-07 | Penetration-resistant RH refining furnace dip pipe and application thereof |
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| CN116640908A true CN116640908A (en) | 2023-08-25 |
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| CN202310670565.XA Pending CN116640908A (en) | 2023-06-07 | 2023-06-07 | Penetration-resistant RH refining furnace dip pipe and application thereof |
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| Country | Link |
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| CN (1) | CN116640908A (en) |
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