CN109628704B - RH vacuum refining furnace and building method thereof - Google Patents
RH vacuum refining furnace and building method thereof Download PDFInfo
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- CN109628704B CN109628704B CN201910117309.1A CN201910117309A CN109628704B CN 109628704 B CN109628704 B CN 109628704B CN 201910117309 A CN201910117309 A CN 201910117309A CN 109628704 B CN109628704 B CN 109628704B
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- C21—METALLURGY OF IRON
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- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/10—Handling in a vacuum
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Abstract
The invention discloses an RH vacuum refining furnace and a building method thereof, belonging to the technical field of building of metallurgical external refining refractory materials. The RH vacuum refining furnace mainly comprises a steel shell, a first heat insulation brick, a second heat insulation brick, a safety layer casting material, a working layer wall brick, a working layer bottom brick, a ramming material, a joint filling material, a circulating pipe and a dip pipe. The safety layer adopts an integral knotted casting material to replace a traditional brick structure, so that the integrity and the safety are good; when the bottom of the steel shell is deformed and maintained by heating, the first heat-insulating brick, the second heat-insulating brick and the safety layer casting material do not need to be completely removed, so that the service life is long; the thicknesses of the wall bricks of the working layer and the castable of the safety layer can be adjusted according to different melting loss rates of the refractory materials of all parts, so that the consumption of the refractory materials is reduced; the dip pipe and the circulating pipe are of an integral structure, the jacking device is used for mounting from the bottom, and when the dip pipe and the circulating pipe are replaced in the process, the wall bricks on the upper working layer of the circulating pipe do not need to be detached, so that the using amount of refractory materials is further saved, and the cost is reduced.
Description
Technical Field
The invention belongs to the technical field of building of metallurgical external refining refractory materials, and particularly relates to an RH vacuum refining furnace and a building method thereof.
Background
The RH vacuum refining technology originated from 50 s, in 1957, the Alebeded company applied for a technical patent of a molten steel vacuum refining degassing method, which is the beginning of the development of the vacuum degassing method, with the development and development of the vacuum steelmaking technology, RH and VD finally become the mainstream of the vacuum steelmaking technology because of the advantages of short processing time, low cost, capability of processing a large amount of molten steel and the like, in the 70 s, with the appearance of a full continuous casting workshop, RH is adopted by a converter process because of the adoption of the technology of circulating molten steel in a vacuum tank, so that the advantages of short processing time, high efficiency and capability of being matched with converter continuous casting are achieved.
The vacuum furnace structure is composed of a vacuum tank body, a pair of circulating pipes, a dip pipe and an argon pipe by wire welding. The shell and the vacuum tank are built by refractory bricks, and the circulating pipe and the dip pipe are cast and formed by refractory materials.
When the RH vacuum steel is refined, the dip pipe is dipped into the ladle tank, the molten steel flows into the vacuum tank from the ascending dip pipe through the circulating pipe under the pushing of argon gas, then flows through the descending dip pipe from the vacuum tank through the descending circulating pipe, and flows back into the ladle tank.
In the prior RH vacuum refining furnace technology, a layer of safety layer brick is built between a vacuum furnace insulating brick and a working layer wall brick, and the safety layer brick is easy to damage in the using process, has short service life, poor integrity and more brick joints and cannot play a good protective role; when the dip pipe is replaced in a new repair and process, the dip pipe is welded from the bottom, and then the circulating pipe is installed from the upper part to the lower part, so that the operation is complex, meanwhile, wall bricks on a working layer need to be removed in a large area, the circulating pipe can be installed, and the material consumption is serious; the flange at the bottom of the vacuum furnace is deformed or damaged, when the flange needs to be replaced, the insulating layer bricks and the safety layer bricks need to be completely removed, and the material waste is serious.
Disclosure of Invention
The invention aims to provide an RH vacuum refining furnace and a building method thereof, which can reduce the consumption of refractory materials of the RH vacuum refining furnace, prolong the service life and reduce the labor intensity when a dip pipe and a circulating pipe are replaced.
The purpose of the invention can be realized by the following technical scheme:
an RH vacuum refining furnace comprises a vacuum furnace device positioned above and a steel flow inlet and outlet device positioned below, wherein the vacuum furnace device comprises a steel shell, a first heat insulation brick, a second heat insulation brick, a safety layer and a working layer wall brick which are sequentially arranged from outside to inside, the steel shell is a shell of the whole RH vacuum smelting furnace, and an inverted splayed flange is fixed at the lower end of the steel shell; a first heat insulation rotor is built on the inner side of the steel shell, a second heat insulation brick is built on the inner side of the first heat insulation brick, a working layer wall brick is built at the position, 50-60mm away from the inner side surface of the second heat insulation brick, of the inner side of the second heat insulation brick, and a safety layer casting material is filled between the second heat insulation layer and the working layer wall brick;
the steel flow inlet and outlet device comprises a working layer bottom brick, a ramming material, a joint filling material, a circulating pipe and a dip pipe, wherein the working layer bottom brick is built on the periphery of the circulating pipe, and the ramming material is filled between the working layer bottom brick and the circulating pipe; the upper part of the circulating pipe is tightly matched with the working wall brick, the dip pipe is built below the circulating pipe, the dip pipe and the circulating pipe are of an integral structure, and gap filling materials are filled at the periphery of the circulating pipe; the circulating pipe and the immersion pipe on the left side form a steel flow inlet, and the circulating pipe and the immersion pipe on the right side form a steel flow outlet.
Furthermore, the casting material of the safety layer casting material is corundum casting material, the critical granularity of the raw materials is 5-8mm, and the casting thickness is more than or equal to 50 mm.
Furthermore, the contact surface of the circulating pipe and the immersion pipe is fixedly connected in a meshing mode.
Furthermore, the joint filler is made of corundum materials, and the water adding amount is 5-6%.
Furthermore, the working layer wall bricks and the working layer bottom bricks are magnesia spinel bricks or magnesia chrome bricks.
A masonry method of an RH vacuum refining furnace comprises the following steps:
step S1, assembling the dip pipe and the circulating pipe into an integral structure, wherein the lining brick at the upper end of the dip pipe and the lower end of the circulating pipe are fixedly connected in a meshing manner;
step S2, mounting and welding the assembled dip pipe and circulating pipe from the bottom of the steel shell by using a jacking device on an inverted splayed flange of the steel shell;
step S3, filling gaps around the circulating pipe with a joint compound;
s4, building a first heat insulation brick, a second heat insulation brick and a working layer bottom brick, wherein a gap of 60-80mm is kept between the working layer bottom brick and the circulating pipe, and the gap is tamped by using a tamping material;
s5, building the wall bricks of the working layer, wherein a gap of 50-60mm is kept between the wall bricks of the working layer and the second heat insulation bricks;
and S6, filling gaps between the wall bricks of the working layer and the second heat insulation bricks with corundum safe layer casting materials, wherein the raw materials of the safe layer casting materials have critical granularity of 3-5mm, completing the construction of the overhaul, and putting the safe layer casting materials into use after baking to complete the construction of the RH vacuum smelting furnace.
The invention has the beneficial effects that:
1. the safety layer adopts the corundum castable to be integrally knotted to replace the traditional brick structure, so that the service life is prolonged by more than one time, the price of the corundum castable is lower than that of the brick, and the cost is reduced;
2. the thickness of the wall bricks of the working layer and the thickness of the castable of the safety layer can be adjusted according to different use environments and melting loss rates of the refractory materials of various parts, so that the consumption of the refractory materials is saved;
3. the dip pipe and the circulating pipe are manufactured into an integral structure, the jacking device is used for mounting from the bottom, and when the dip pipe and the circulating pipe are replaced in the process, the bricks on the upper working layer of the circulating pipe do not need to be dismantled, so that the building labor intensity is reduced while the using amount of the refractory materials is saved.
Drawings
In order to facilitate understanding for those skilled in the art, the present invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic structural view of an RH vacuum refining furnace according to the present invention;
reference numbers in the figures: 1-steel shell, 2-first insulating brick, 3-second insulating brick, 4-safety layer casting material, 5-working layer wall brick, 6-working layer bottom brick, 7-ramming material, 8-joint material, 9-circulating pipe, 10-dip pipe and 11-inverted splayed flange.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
An RH vacuum refining furnace comprises a vacuum furnace device positioned above and a steel flow inlet and outlet device positioned below, wherein the vacuum furnace device comprises a steel shell 1, a first heat insulation brick 2, a second heat insulation brick 3, a safety layer 4 and a working layer wall brick 5 which are sequentially arranged from outside to inside, the steel shell 1 is a shell of the whole RH vacuum smelting furnace, and an inverted splayed flange 11 is fixed at the lower end of the steel shell 1; a first heat insulation rotor 2 is built on the inner side of the steel shell 1, a second heat insulation brick 3 is built on the inner side of the first heat insulation brick 2, a working layer wall brick 5 is built on the inner side of the second heat insulation brick 3 at a position 50-60mm away from the inner side surface of the second heat insulation brick 3, a safety layer casting material 4 is filled between the second heat insulation layer 3 and the working layer wall brick 5, the safety layer casting material 4 adopts an integral knotting casting material to replace a traditional brick building structure, and the integrity and the safety are good; preferably, the casting material of the safety layer casting material 4 is corundum casting material, the critical granularity of the raw materials is 5-8mm, the flowing property is good, and the casting thickness is more than or equal to 50 mm; the construction method of the working layer wall bricks 5 and the safety layer casting materials 4 comprises the following steps: the wall bricks 5 of the working layer are built firstly, and then the castable 4 of the safety layer is poured, so that the thicknesses of the wall bricks 5 of the working layer and the castable 4 of the safety layer can be adjusted according to different use environments and different melting loss rates of the refractory materials of all parts, and the consumption of the refractory materials is reduced;
when the bottom of the steel shell 1 is deformed and maintained by heating, the casting material of the safety layer 4 does not need to be completely removed, and the service life is long;
the steel flow inlet and outlet device comprises a working layer bottom brick 6, a ramming material 7, a joint filling material 8, a circulating pipe 9 and a dip pipe 10, wherein the working layer bottom brick 6 is built on the periphery of the circulating pipe 9, and the ramming material 7 is filled between the working layer bottom brick 6 and the circulating pipe 9; the upper part of the circulating pipe 9 is tightly matched with the working layer 5, the dip pipe 10 is built below the circulating pipe 9, the dip pipe 10 and the circulating pipe 9 are of an integral structure, and the contact surfaces of the circulating pipe 9 and the dip pipe 10 (lining bricks at the upper end of the dip pipe 10 and lining bricks at the bottom end of the circulating pipe 9) are fixedly connected in a meshing manner, so that the integrity is strong; the gap at the periphery of the circulating pipe 9 is filled with a joint filling material 8, the joint filling material 8 is made of corundum, and the water adding amount is 5-6%; the circulating pipe 9 and the dip pipe 10 on the left side form a steel flow inlet, the circulating pipe 9 and the dip pipe 10 on the right side form a steel flow outlet, when RH vacuum steel refining is carried out, the dip pipe 10 is immersed in a molten steel color tank, molten steel flows into the vacuum tank from the left side dip pipe 10 through the left side circulating pipe 9 under the pushing of argon, then flows through the right side dip pipe 10 from the vacuum tank through the right side circulating pipe 9, flows back into a steel ladle tank, and is circulated once after 260 tons of molten steel for 30 minutes, so that the purity of the steel is improved, and the steel with high quality requirement is achieved;
the dip pipe 10 and the circulating pipe 9 are of an integral structure, the dip pipe 10 and the circulating pipe 9 are installed from the bottom by utilizing a jacking device, and when the dip pipe 10 and the circulating pipe 9 are replaced in the process, the bricks on the upper working layer of the circulating pipe 9 do not need to be removed, so that the consumption of refractory materials is further saved, and the cost is reduced;
the working layer wall bricks 5 and the working layer bottom bricks 6 are magnesia spinel bricks or magnesia chrome bricks;
the masonry method of the RH vacuum refining furnace comprises the following steps:
step S1, assembling the dip pipe 10 and the circulating pipe 9 into an integral structure, wherein the lining bricks at the upper end of the dip pipe 10 and the lower end of the circulating pipe 9 are fixedly connected in a meshing manner;
step S2, mounting and welding the assembled dip pipe 10 and the circulation pipe 9 on the inverted-splayed flange 11 of the steel shell 1 from the bottom of the steel shell 1 by using a jacking device;
step S3, filling gaps around the circulating pipe 9 by using a joint compound 8;
s4, building the first heat insulation brick 2, the second heat insulation brick 3 and the working layer bottom brick 6, wherein a gap of 60-80mm is kept between the working layer bottom brick 6 and the circulating pipe 9, and the gap is tamped by using a tamping material 7;
s5, building a working layer wall brick 5, and keeping a 50-60mm gap between the working layer wall brick 5 and the second heat insulation brick 3;
step S6, filling gaps between the working layer wall bricks 5 and the second heat insulation bricks 3 with corundum safe layer casting materials 4, forming critical granularity of 3-5mm by the safe layer casting materials 4, finishing overhaul masonry, putting into use after baking, and finishing masonry of the RH vacuum smelting furnace;
when the RH vacuum refining furnace is built in the later use process, the circulating pipe 9 and the dip pipe 10 are mainly replaced, the replacement method is the same as the full repair method of the RH vacuum refining furnace, and the wall brick 5 of the working layer on the upper part of the circulating pipe 9 is not required to be removed;
the bottom of the steel shell 1 is deformed due to heating, so that the safety layer casting material 4 does not need to be removed during maintenance and replacement, and the service life is prolonged.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (2)
1. The RH vacuum refining furnace is characterized by comprising a vacuum furnace device positioned above and a steel flow inlet-outlet device positioned below, wherein the vacuum furnace device comprises a steel shell (1), a first heat insulation brick (2), a second heat insulation brick (3), a safety layer casting material (4) and a working layer wall brick (5) which are sequentially arranged from outside to inside, the steel shell (1) is a shell of the whole RH vacuum smelting furnace, and an inverted splayed flange (11) is fixed at the lower end of the steel shell (1); a first heat insulation brick (2) is built on the inner side of the steel shell (1), a second heat insulation brick (3) is built on the inner side of the first heat insulation brick (2), a working layer wall brick (5) is built on the position, 50-60mm away from the inner side surface of the second heat insulation brick (3), of the inner side of the second heat insulation brick (3), and a safety layer pouring material (4) is filled between the second heat insulation brick (3) and the working layer wall brick (5);
the steel flow inlet and outlet device comprises a working layer bottom brick (6), a ramming material (7), a joint filling material (8), a circulating pipe (9) and a dip pipe (10), wherein the working layer bottom brick (6) is built on the periphery of the circulating pipe (9), and the ramming material (7) is filled between the working layer bottom brick (6) and the circulating pipe (9); the upper part of the circulating pipe (9) is tightly matched with the wall brick (5) of the working layer, the dip pipe (10) is built below the circulating pipe (9), the dip pipe (10) and the circulating pipe (9) are of an integral structure, and gap filling materials (8) are filled in the peripheral gap of the circulating pipe (9); the circulation pipe (9) and the dip pipe (10) on the left side form a steel flow inlet, and the circulation pipe (9) and the dip pipe (10) on the right side form a steel flow outlet;
the safety layer casting material (4) is a corundum casting material, the critical granularity of the raw materials is 5-8mm, and the casting thickness is more than or equal to 50 mm;
the contact surfaces of the circulating pipe (9) and the dip pipe (10) are fixedly connected in a meshing manner;
the joint filler (8) is made of corundum, and the water adding amount is 5-6%;
the working layer wall bricks (5) and the working layer bottom bricks (6) are magnesia spinel bricks or magnesia chrome bricks.
2. The masonry method of the RH vacuum refining furnace according to claim 1, characterized by comprising the following steps:
step S1, assembling the dip pipe (10) and the circulating pipe (9) into an integral structure, and connecting and fixing the lining brick at the upper end of the dip pipe (10) and the lower end of the circulating pipe (9) in a meshing manner;
s2, mounting and welding the assembled dip pipe (10) and circulating pipe (9) on an inverted splayed flange (11) of the steel shell (1) from the bottom of the steel shell (1) by using a jacking device;
step S3, filling gaps around the circulating pipe (9) by using a joint compound (8);
s4, building a first heat insulation brick (2), a second heat insulation brick (3) and a working layer bottom brick (6), wherein a gap of 60-80mm is kept between the working layer bottom brick (6) and a circulating pipe (9), and the gap is tamped by using a tamping material (7);
s5, building the working layer wall bricks (5), wherein a gap of 50-60mm is kept between the working layer wall bricks (5) and the second heat insulation bricks (3);
and S6, filling gaps between the wall bricks (5) of the working layer and the second heat insulation bricks (3) with corundum safety layer casting materials (4), forming critical granularity of 3-5mm by using the raw materials of the safety layer casting materials (4), finishing overhaul masonry, putting into use after baking, and finishing the masonry of the RH vacuum smelting furnace.
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| CN113894923A (en) * | 2021-09-30 | 2022-01-07 | 营口市瑞福来耐火材料有限公司 | Integral forming production method of dip pipe and integral forming dip pipe |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN201128745Y (en) * | 2007-11-22 | 2008-10-08 | 宝山钢铁股份有限公司 | Large circulation dip pipe for vacuum degassing device |
| CN202671581U (en) * | 2012-06-14 | 2013-01-16 | 鞍钢股份有限公司 | Bottom groove of vacuum circulation degassing furnace |
| CN102978345B (en) * | 2012-12-24 | 2014-03-12 | 武汉钢铁(集团)公司 | Low-chrome refractory material RH refining furnace and building method thereof |
| CN204097510U (en) * | 2014-09-30 | 2015-01-14 | 洛阳利尔耐火材料有限公司 | A kind of RH vacuum refining furnace configuring chromium-free brick |
| CN205289726U (en) * | 2015-12-18 | 2016-06-08 | 武汉钢铁(集团)公司 | Permanent layer pouring body of improved generation combined type ladle |
| CN205821375U (en) * | 2016-06-29 | 2016-12-21 | 中钢集团耐火材料有限公司 | A kind of RH refining furnace vacuum chamber task layer structure-improved |
| CN106623883A (en) * | 2016-12-14 | 2017-05-10 | 山东钢铁股份有限公司 | Integral pouring process for large steel ladle |
| CN206768167U (en) * | 2017-04-24 | 2017-12-19 | 洛阳利尔耐火材料有限公司 | A kind of masonry construction of RH refining furnaces lower channel |
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Denomination of invention: A RH vacuum refining furnace and its masonry method Effective date of registration: 20210204 Granted publication date: 20201117 Pledgee: Anhui Ma'anshan Rural Commercial Bank Co.,Ltd. Pledgor: ANHUI XINHAI ENVIRONMENTAL PROTECTION NEW MATERIAL Co.,Ltd. Registration number: Y2021980001029 |
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Effective date of registration: 20231011 Address after: 243000 No.8, dingzhouqiao Road, Yushan District, Maanshan City, Anhui Province Patentee after: RUITAI MASTEEL NEW MATERIAL TECHNOLOGY Co.,Ltd. Address before: No. 155 Huxi South Road, Ma'anshan City, Anhui Province, 243000 Patentee before: ANHUI XINHAI ENVIRONMENTAL PROTECTION NEW MATERIAL Co.,Ltd. |