CN115820958B - Repairing method for blast furnace hearth - Google Patents
Repairing method for blast furnace hearth Download PDFInfo
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- CN115820958B CN115820958B CN202211530409.5A CN202211530409A CN115820958B CN 115820958 B CN115820958 B CN 115820958B CN 202211530409 A CN202211530409 A CN 202211530409A CN 115820958 B CN115820958 B CN 115820958B
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- furnace hearth
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- wall
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- 238000000034 method Methods 0.000 title claims abstract description 39
- 239000000463 material Substances 0.000 claims abstract description 75
- 238000005266 casting Methods 0.000 claims abstract description 65
- 230000001681 protective effect Effects 0.000 claims abstract description 26
- 230000008439 repair process Effects 0.000 claims abstract description 13
- 238000001035 drying Methods 0.000 claims abstract description 7
- 239000000945 filler Substances 0.000 claims description 30
- 239000006185 dispersion Substances 0.000 claims description 27
- 230000000149 penetrating effect Effects 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000009434 installation Methods 0.000 claims 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 24
- 229910052799 carbon Inorganic materials 0.000 description 23
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 20
- 239000011449 brick Substances 0.000 description 19
- 230000008569 process Effects 0.000 description 12
- 229910052742 iron Inorganic materials 0.000 description 10
- 229910000831 Steel Inorganic materials 0.000 description 8
- 239000010959 steel Substances 0.000 description 8
- 239000011819 refractory material Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
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- 238000004873 anchoring Methods 0.000 description 4
- 238000012986 modification Methods 0.000 description 4
- 230000004048 modification Effects 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 238000003723 Smelting Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 230000004075 alteration Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
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- 230000002035 prolonged effect Effects 0.000 description 2
- RHZUVFJBSILHOK-UHFFFAOYSA-N anthracen-1-ylmethanolate Chemical compound C1=CC=C2C=C3C(C[O-])=CC=CC3=CC2=C1 RHZUVFJBSILHOK-UHFFFAOYSA-N 0.000 description 1
- 239000003830 anthracite Substances 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
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- 239000004568 cement Substances 0.000 description 1
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- 239000003365 glass fiber Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
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- 238000000227 grinding Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
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- 230000008018 melting Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 description 1
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- 238000003825 pressing Methods 0.000 description 1
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Classifications
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
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- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
The application discloses a method for repairing a blast furnace hearth, which belongs to the technical field of blast furnace hearth repairing, and comprises the following steps: inserting a plurality of anchor rods which are arranged at intervals into the residual wall of the blast furnace hearth, wherein the anchor rods are provided with cantilever sections positioned in the residual cavity of the blast furnace hearth; sleeving a plurality of elastic protective sleeves on cantilever sections of corresponding anchor rods, building a ring sleeve mold in the residual cavity, wherein the cantilever sections of the anchor rods are positioned between the ring sleeve mold and the residual wall; adding casting materials into the space between the outer side surface of the ring sleeve mold and the residual wall, and drying to form a casting body; taking off the ring sleeve mould and the plurality of protective sleeves, and forming a ring seam between the cantilever section of the anchor rod and the casting body; filling the annular gaps with filling materials to finish the repair of the blast furnace hearth. The blast furnace hearth repairing method provided by the application realizes the repair of the blast furnace hearth, the repaired hearth casting body is not easy to fall off, the service life of the hearth can reach 3 years, and the service life is long.
Description
Technical Field
The invention belongs to the technical field of blast furnace hearth repair, and particularly relates to a repair method of a blast furnace hearth.
Background
The blast furnace hearth is a structural area of the blast furnace, generally reaches the furnace body between the central line of the first exhaust outlet and the furnace bottom, can collect and store molten iron and slag, and the volume of the hearth determines the capacity of the blast furnace. The blast furnace hearth adopts a steel plate as a shell, refractory bricks are built on the inner wall of the shell as a working layer, and the working layer is surrounded into Rong Tieqiang. In the long-term smelting process of the blast furnace hearth, the working layer can be corroded by molten iron in the molten iron cavity, and the working layer is thinned, so that the multiple working layers are needed to be repaired and can be reused.
CN201610353176.4 discloses a maintenance method for integrally and seamlessly casting refractory materials on the hearth of a blast furnace, which records that an anti-oxidation interface bonding treatment agent is smeared on the surface of an corroded carbon brick, then a ceramic fiber board is added, finally, a side wall of the hearth is baked after casting maintenance on a side wall support mold by combining a silicon carbide casting material with sol, and the repair of the side wall of the hearth is completed. CN201810631753.0 discloses a repairing material for a blast furnace hearth, which describes that the repairing material can be rapidly hardened and formed after being poured into the hearth, so that the rapid demoulding is facilitated, the construction is easy, and the production efficiency is improved.
The prior art adopts an integral casting method to repair the side wall of the hearth, and the original carbon bricks of the side wall working layer of the hearth are different from castable materials, so that the castable and the carbon bricks are very easy to fall off in the use process, the service life of the castable is only 0.5-1 year, the service life of the hearth is reduced, and molten iron is polluted.
Disclosure of Invention
In order to solve the technical problems, the invention provides a method for repairing a blast furnace hearth, which can realize effective connection of a residual wall and a casting body, the casting body is not easy to fall off, and the repaired hearth has long service life.
The technical scheme of the invention is as follows:
the invention provides a method for repairing a blast furnace hearth, which comprises the following steps:
Inserting a plurality of anchor rods arranged at intervals into a residual wall of a blast furnace hearth, wherein the anchor rods are provided with cantilever sections positioned in a residual cavity of the blast furnace hearth;
sleeving a plurality of elastic protective sleeves on the cantilever sections of the corresponding anchor rods, and building a ring sleeve mold in the residual cavity, wherein the cantilever sections of the anchor rods are positioned between the ring sleeve mold and the residual wall;
adding casting materials into the space between the outer side surface of the ring sleeve mold and the residual wall, and drying to form a casting body;
Removing the loop mould and the protective sleeves, and forming a loop seam between the cantilever section of the anchor rod and the casting body;
filling the annular gaps with filling materials to finish the repair of the blast furnace hearth.
In some embodiments, the anchor rod and the stub wall have the same coefficient of thermal expansion; the diameter of the anchor rod is 100-150mm, and the length of the anchor rod extending into the residual wall is larger than the cantilever section of the anchor rod.
In some embodiments, the length of the anchor rod extending into the stub wall is 350-450mm and the length of the cantilever segment is 200-300mm.
In some embodiments, the filling material is filled into the circumferential seam, specifically including:
Baking the circular seam at 500-600 ℃ for 6-8 hours, and filling the circular seam with a filler; the thermal expansion rate of the filling material is between the thermal expansion rate of the anchor rod and the thermal expansion rate of the casting body; the difference between the inner diameter and the outer diameter of the circular seam is 10-30mm.
In some embodiments, the inserting a plurality of bolts arranged at intervals into the stub wall of the blast furnace hearth specifically includes:
a plurality of mounting holes which are arranged at intervals are formed in the residual wall of the blast furnace hearth;
And inserting a plurality of anchor rods into the corresponding mounting holes in a coaxial clearance manner, and filling stress dispersion materials into the clearance between the anchor rods and the inner walls of the corresponding mounting holes.
In some embodiments, the diameter difference between the anchor rod and the mounting hole is 8-15mm, the anchor rod is positioned below the central line of the tap hole of the blast furnace, and the thickness of the residual wall at the anchor rod is more than or equal to 600mm.
In some embodiments, the gap between the anchor rod and the inner wall of the corresponding mounting hole is filled with a stress dispersion material by a filler comprising:
an outer sleeve provided with a feed hole penetrating through the cylinder wall;
The inner sleeve is used for being sleeved outside the anchor rod, the inner sleeve is inserted in the outer sleeve in a coaxial clearance, and the end faces of the inner sleeve are switchably positioned on two sides of the feeding hole along the axial direction of the inner sleeve so as to push out the stress dispersion material entering from the feeding hole outside the outer sleeve.
In some embodiments, the feed holes are provided in a plurality, and the feed holes are radially distributed with the axial direction of the outer sleeve as the center;
the filler also comprises a limit sleeve, the limit sleeve is sleeved outside the outer sleeve in a clearance mode, the limit sleeve is provided with a through hole penetrating through the wall of the cylinder, and the through hole is operatively communicated with any feeding hole.
In some embodiments, a guiding groove penetrating through the cylinder wall is arranged on the peripheral surface of the outer sleeve, the guiding groove has a component along the axial direction of the cylinder body, the inner sleeve is provided with a guiding protrusion matched with the guiding groove, and the guiding protrusion is movably embedded in the guiding groove along the length direction of the guiding groove.
In some embodiments, the guide groove is communicated with the feed inlet and penetrates through to the end part of the outer sleeve to form a pushing groove, the guide protrusion is located on the outer circumferential surface of the end part of the inner sleeve, and the guide protrusion is movably embedded in the pushing groove.
The beneficial effects of the invention at least comprise:
The repairing method of the blast furnace hearth provided by the application comprises the following steps: inserting a plurality of anchor rods arranged at intervals into a residual wall of a blast furnace hearth, wherein the anchor rods are provided with cantilever sections positioned in a residual cavity of the blast furnace hearth; sleeving a plurality of elastic protective sleeves on the cantilever sections of the corresponding anchor rods, and building a ring sleeve mold in the residual cavity, wherein the cantilever sections of the anchor rods are positioned between the ring sleeve mold and the residual wall; adding casting materials into the space between the outer side surface of the ring sleeve mold and the residual wall, and drying to form a casting body; removing the loop mould and the protective sleeves, and forming a loop seam between the cantilever section of the anchor rod and the casting body; filling the annular gaps with filling materials to finish the repair of the blast furnace hearth. According to the application, the anchor rod is adopted as an anchoring structure, one end of the anchor rod extends into the residual wall of the blast furnace hearth, and the cantilever section at the other end of the anchor rod extends into the integrally poured castable, so that the connection strength between the residual wall and the castable is improved; however, because the castable is in a high-temperature state and generates stress in the baking process of the castable and the high-temperature iron making process of the blast furnace, the cantilever section of the anchor rod is directly embedded into the castable to enable the anchor rod made of the refractory material to deform or even break under the stress action of the castable, and the effect of connecting the side wall of the hearth of the blast furnace with the castable is lost, so that the cantilever section of the anchor rod is sleeved with the elastic protective sleeve, and the stress of the castable is transmitted to the protective sleeve in the baking process of the castable to enable the protective sleeve to deform, thereby protecting the anchor rod made of the refractory material; and then the protective sleeve is taken down, and the filling material is added into the left circular seam to ensure the integrity of the anchor rod and the casting material, so that obvious relative movement between the casting material and the anchor rod is avoided, and the effective connection of the casting body formed by the anchor rod and the casting material is realized. The blast furnace hearth repairing method provided by the application realizes the repair of the blast furnace hearth, and the repaired hearth casting body is not easy to fall off, so that the service life is long.
Drawings
Fig. 1 shows a schematic structural diagram of the assembly of the residual wall and the anchor rod in the embodiment of the application.
Fig. 2 shows a schematic structural diagram of the packer, the anchor rod and the stub wall cooperation in an embodiment of the application.
Fig. 3 shows a schematic structural diagram of the filler in fig. 2 before pushing the filler into the gap.
Fig. 4 shows a schematic structural diagram of the filler in fig. 2 after pushing the filler into the gap.
Fig. 5 shows a schematic end view of the fit of the outer and inner sleeves of the filler device of fig. 4.
Fig. 6 shows a schematic view of the end face of the outer sleeve of the filler device of fig. 4.
Figure 7 shows a schematic view of the end face of the inner sleeve of the filler device of figure 4.
Fig. 8 shows a schematic structural diagram of the embodiment of the application at the end of casting.
Reference numerals illustrate:
1000-hearth; 100-filler, 110-limit sleeve, 111-via hole, 120-outer sleeve, 121-guide groove, 122-feeding hole, 123-pushing groove, 130-inner sleeve, 131-guide protrusion; 140-feeding groove; 141-a separator; 150-handle; 200-residual wall; 300-gap; 400-stress dispersion material; 500-loop mold; 600-casting body; 700-anchor rod, 710-cantilever section; 800-protective sleeve.
Detailed Description
In order to make the present application more clearly understood by those skilled in the art, the following detailed description of the technical scheme of the present application will be given by way of specific examples with reference to the accompanying drawings.
In the prior art, the repairing of the hearth residual wall generally adopts the steps of smearing a bonding treatment agent on the residual wall, and then carrying out integral casting to improve the connection strength between the integrally cast casting body and the residual wall, wherein the residual wall is a carbon brick, the casting body is generally composed of aluminum oxide and silicon carbide, for example 88% of Al 2O3 and 12% of SiC, the casting body and the carbon brick are different in material, and the casting body and the carbon brick are very easy to separate in the high-temperature smelting operation of the blast furnace hearth, so that the casting body falls off.
In order to solve the technical problems, the application adopts the anchor rod with the same thermal expansion coefficient as the residual wall carbon brick of the blast furnace hearth as an anchoring structure, one end of the anchor rod extends into the residual wall of the blast furnace hearth, and the cantilever section at the other end of the anchor rod extends into the integrally cast castable, so that the connection strength between the residual wall and the castable is improved; however, because the castable is in a high-temperature state and generates stress in the baking process of the castable and the high-temperature iron making process of the blast furnace, the cantilever section of the anchor rod is directly embedded into the castable to enable the anchor rod made of the refractory material to deform or even break under the stress action of the castable, and the effect of connecting the side wall of the hearth of the blast furnace with the castable is lost, so that the cantilever section of the anchor rod is sleeved with the elastic protective sleeve, and the stress of the castable is transmitted to the protective sleeve in the baking process of the castable to enable the protective sleeve to deform, thereby protecting the anchor rod made of the refractory material; and then the protective sleeve is taken down, and filling materials are added into the left annular gaps to ensure the integrity of the anchor rod and the casting materials, so that obvious relative movement between the casting materials and the anchor rod is avoided. According to the application, the anchor rod with the same thermal expansion coefficient as the residual wall of the blast furnace hearth is used as an anchoring structure, so that the residual wall of the blast furnace hearth and the anchor rod have the same expansion performance, the same expansion rate of the anchor rod and the residual wall is ensured in high-temperature operation of the blast furnace, and the connection strength of the anchor rod and the residual wall is ensured; the working procedure of sleeving the elastic protective sleeve on the cantilever section of the anchor rod and then pouring the castable is set, so that the risk of deformation and even fracture of the anchor rod caused by the expansion of the castable in the drying process is avoided, and the effective connection of the anchor rod and the castable is realized.
The embodiment of the application provides a method for repairing a blast furnace hearth, which comprises the following steps:
S1, inserting a plurality of anchor rods arranged at intervals into a residual wall of a blast furnace hearth, wherein the anchor rods are provided with cantilever sections positioned in a residual cavity of the blast furnace hearth.
Referring to fig. 1, the anchor 700 is inserted into the stub wall 200, and the anchor 700 may be connected to the stub wall 200, and the cantilever section 710 of the anchor 700 may be connected to the casting, so that the anchor 700 may connect the stub wall 200 to the casting. The blast furnace hearth 1000 includes a housing and a masonry carbon brick attached to an inner wall of the housing, and the carbon brick is eroded by high-temperature scouring of molten iron during blast furnace iron making to form a stub wall 200. The anchor bar 700 may be perpendicular to the axial direction of the hearth 1000, and the anchor bar 700 may be at an angle to the axial direction of the hearth 1000, preferably the anchor bar 700 is perpendicular to the axial direction of the hearth 1000.
In some embodiments, the anchor 700 has the same coefficient of thermal expansion as the stub wall 200; the diameter of the anchor rod 700 is 100-150mm, and the length of the anchor rod 700 extending into the residual wall 200 is greater than the cantilever section 710 of the anchor rod 700.
The same thermal expansion coefficient of the anchor rod 700 and the stub wall 200 can be achieved by: the anchor 700 may be made of the same material as the carbon brick used for the stub wall 200, and the anchor 700 may be made of a refractory material having the same coefficient of thermal expansion as the carbon brick used for the stub wall 200, but a different composition from the carbon brick used for the stub wall 200. The anchor rod 700 with the same thermal expansion coefficient as the residual wall 200 of the blast furnace hearth 1000 is adopted as an anchoring structure, so that the residual wall 200 of the blast furnace hearth 1000 and the anchor rod 700 have the same expansion performance, the same expansion rate of the anchor rod 700 and the residual wall 200 is ensured in high-temperature operation of the blast furnace, and the connection strength of the anchor rod 700 and the residual wall 200 is ensured; if the anchor rod 700 is made of steel, on one hand, in the high-temperature working environment of a blast furnace, the expansion size of the residual bricks is smaller than that of the steel anchor rod 700, the expansion of the steel anchor rod 700 can cause the residual bricks to be damaged, the connection strength between the steel anchor rod 700 and the residual wall 200 is reduced, and the casting body and the steel anchor rod 700 can fall off from the residual wall 200 after a long time; on the other hand, the casting body is gradually eroded by the blast furnace smelting, and after the steel anchor rod 700 is exposed, the anchor rod 700 is melted by the high-temperature molten iron, and the casting body is also caused to fall off from the residual wall 200. If the material of the anchor rod 700 is different from the thermal expansion of the stub wall 200, stress concentration occurs at the anchor rod 700 in the high-temperature environment of blast furnace ironmaking, so that the stub wall 200 and the anchor rod 700 are easy to separate. Controlling the diameter of the anchor rod 700 ensures that the anchor rod 700 has good strength and a smaller number of anchor rods 700 can be deployed. The length of the anchor rod 700 extending into the residual wall 200 is greater than the length of the cantilever section 710, so that the casting body can be stably connected to the residual wall 200, if the length of the anchor rod 700 extending into the residual wall 200 is smaller than the length of the cantilever section 710, the residual wall 200 can be damaged under the action of gravity of the casting body, and therefore a gap 300 is formed between the anchor rod 700 and the residual wall 200, and finally the risk that the anchor rod 700 falls off from the residual wall 200 occurs. In addition, the length of the cantilever section 710 is set to match the sum of the dimensions of the stub wall 200 and the casting body along the radial direction of the hearth 1000 to the thickness of the hearth 1000.
Preferably, the length of the anchor rod 700 extending into the stub wall 200 is 350-450mm and the length of the cantilever segment 710 is 200-300mm.
In some embodiments, a plurality of spaced apart anchors 700 are inserted into the stub wall 200 of the blast furnace hearth 1000, specifically comprising:
s11, arranging a plurality of mounting holes at intervals on the residual wall 200 of the blast furnace hearth 1000;
Mounting holes are formed at positions with the thickness of the residual wall 200 being more than or equal to 600mm, so that the residual wall 200 has enough strength for being connected with the casting body 600, and the rooting condition of the anchor rod 700 is improved; the setting range of the mounting hole can select the easily eroded and peeled area of the hearth 1000, and the easily eroded and peeled area of the hearth 1000 has strong strengthening requirement; specifically, a position 1.3m below the central line of the blast furnace tap hole is selected as a datum line, and an included angle is formed between the axial direction of the mounting hole and the radial direction of the blast furnace hearth 1000 within the range of 0.7m above and below the datum line, namely within the range of 0.6m to 2m below the central line of the blast furnace tap hole; the drilling tool for the mounting holes can adopt a drilling device with the inner diameter of 100-150mm, the depth of the mounting holes is adjusted according to the thickness of the residual wall 200, the thickness of the residual wall 200 is large, the depth of the mounting holes can be deeper, the thickness of the residual wall 200 is small, and the depth of the mounting holes can be shallower. The tap hole of the blast furnace is also a region where the blast furnace is severely corroded, so that the mounting holes can be distributed in a radial radiation range of 0.7-1.0m with the position of 1.3m right below the tap hole as the center. The depth of the mounting hole is 350-450mm, so that the acting area of the anchor rod 700 and the mounting hole can be increased, and the stress is dispersed; in addition, the mounting hole may not penetrate through the stub wall 200 to avoid the occurrence of air leakage or iron leakage safety problem.
And S12, inserting a plurality of anchor rods 700 into the corresponding mounting holes in a coaxial clearance manner, and filling the gaps 300 between the anchor rods 700 and the inner walls of the corresponding mounting holes with stress dispersion materials.
Referring to fig. 3, the anchor rod 700 and the mounting hole have a gap 300, so that the anchor rod 700 can be easily inserted into the corresponding mounting hole; in addition, a space for filling the stress dispersing material 400, namely, carbon ramming material, which is similar to or identical to the carbon bricks used by the residual wall 200 can be provided, the carbon ramming material can uniformly disperse the stress of the anchor rod 700 to the inner wall of the mounting hole under the high-temperature condition of blast furnace ironmaking, and the risk of falling off the anchor rod 700 from the residual wall 200 is reduced.
In some embodiments, the diameter difference between the anchor rod 700 and the mounting hole is 8-15mm, the anchor rod 700 is positioned below the central line of the tap hole of the blast furnace, and the thickness of the residual wall 200 at the anchor rod 700 is more than or equal to 600mm.
In some embodiments, the stress dispersion 400 is filled into the gap 300 between the anchor rod 700 and the inner wall of the corresponding mounting hole by a filler, which may be a device disclosed in the prior art that can fill the gap 300 between the anchor rod 700 and the mounting hole with carbon ramming, in this embodiment, referring to fig. 2 to 4, the filler 100 includes an outer sleeve 120 and an inner sleeve 130, the outer sleeve 120 being provided with a feed hole 122 penetrating the cylinder wall; the inner sleeve 130 is used for being sleeved outside the anchor rod 700, the inner sleeve 130 is coaxially inserted into the outer sleeve 120, and the end surfaces of the inner sleeve 130 are switchably positioned at two sides of the feeding hole 122 along the axial direction of the inner sleeve 130, so as to push out the stress dispersion material 400 entering from the feeding hole 122 outside the outer sleeve 120. Outer sleeve 120 and inner sleeve 130 may each be made of a metallic material, such as a steel material, with outer sleeve 120 and inner sleeve 130 being in clearance fit; when the packer 100 is used, the inner sleeve 130 is sleeved outside the cantilever section 710 of the anchor rod 700, the outer sleeve 120 is sleeved outside the inner sleeve 130, the end face of the inner sleeve 130 close to the residual wall 200 is arranged in the outer sleeve 120, so that the end face of the inner sleeve 130 close to the residual wall 200, the cylinder body of the outer sleeve 120 and the outer circumferential surface of the anchor rod 700 are surrounded to form a containing cavity for containing the stress dispersion material 400, namely the carbon ramming material is fed into the containing cavity from the feeding hole 122 of the outer sleeve 120, the inner sleeve 130 is pushed axially, the inner sleeve 130 is made to be close to the residual wall 200 along the axial direction of the anchor rod 700, the end face of the inner sleeve 130 moves towards the residual wall 200 to compress the space of the containing cavity, and the stress dispersion material 400 in the containing cavity is discharged from the inner hole of the outer sleeve 120 to the outer sleeve 120 under the action of the end face pressure of the inner sleeve 130, so as to enter into a gap between the anchor rod 700 and the inner wall of the mounting hole.
In some embodiments, the feed holes 122 are provided in plurality, and the plurality of feed holes 122 are radially distributed centering on the axial direction of the outer sleeve 120; the filler 100 further comprises a limiting sleeve 110, the limiting sleeve 110 is sleeved outside the outer sleeve 120 through a gap 300, the limiting sleeve 110 is provided with a through hole 111 penetrating through the wall of the cylinder, and the through hole 111 is operatively communicated with any feeding hole 122. The plurality of feed holes 122 are arranged and are radially distributed by taking the axial direction of the outer sleeve 120 as the center, and the stress dispersion material 400 can be added through any feed hole 122, so that the uniformity of the distribution of the stress dispersion material 400 on the periphery of the anchor rod 700 is improved. The feeding holes 122 are provided in plural, the axial direction of the feeding holes 122 may be distributed along the radial direction, or the axial direction of the feeding holes 122 may be inclined with the radial direction, in use, some feeding holes 122 are vertically arranged, and the stress dispersion material 400 may fall from the feeding holes 122, so that the stress dispersion material 400 may be stably maintained in the feeding holes 122 without falling by adding the limit sleeve 110. The charging process is as follows: the through hole 111 of the limiting sleeve 110 faces upwards, the stress dispersion material 400 is added from the through hole 111, the stress dispersion material 400 enters the accommodating cavity from the corresponding feeding hole 122 under the action of gravity, after the accommodating cavity corresponding to the feeding hole 122 is filled, the outer sleeve 120 is rotated, the through hole 111 of the limiting sleeve 110 is communicated with the other feeding hole 122, then the material is sequentially fed into the accommodating cavity through the through hole 111 and the other feeding hole 122, and the like until the stress dispersion material 400 is filled in the accommodating cavity. In addition, the filler 100 may further include a feeding groove 140, where the feeding groove 140 is connected to the limiting sleeve 110, and the feeding groove 140 is provided with a feeding cavity with an upper opening, and the feeding cavity is communicated with the through hole 111; the side of the feed trough 140, which is close to the stub wall 200, is inclined in a direction away from the stub wall 200, so that the stub wall 200 can be avoided from having a structure protruding toward the inside of the stub cavity.
In some embodiments, referring to fig. 5 to 7, a guiding groove 121 penetrating through a wall of the barrel is provided on a circumferential surface of the outer sleeve 120, the guiding groove 121 has a component along an axial direction of the barrel, the inner sleeve 130 is provided with a guiding protrusion 131 engaged with the guiding groove 121, and the guiding protrusion 131 is movably embedded in the guiding groove 121 along a length direction of the guiding groove 121. The guide groove 121 has a component along the axial direction of the barrel, specifically, the guide groove 121 may be disposed along the axial direction of the barrel, and the guide groove 121 may also be spirally wound along the axial direction of the barrel, which is not particularly limited; the provision of guide slots 121 provides guidance for the relative movement of outer sleeve 120 and inner sleeve 130, improving stability in the relative movement of outer sleeve 120 and inner sleeve 130. In other embodiments, in order to further improve stability during the relative movement of the outer sleeve 120 and the inner sleeve 130, a plurality of guide grooves 121 may be provided, and the plurality of guide grooves 121 may be disposed at intervals along the circumferential direction of the outer sleeve 120, and the guide protrusions 131 of the inner sleeve 130 may be movably embedded in the corresponding guide grooves 121 along the length direction of the corresponding guide grooves 121.
In some embodiments, the guide groove 121 is communicated with the feeding hole and penetrates to the end of the outer sleeve 120 to form a pushing groove 123, the guide protrusion 131 is located on the outer circumferential surface of the end of the inner sleeve 130, and the guide protrusion 131 is movably embedded in the pushing groove 123. The pushing groove 123 has the guiding function, the feeding and discharging functions, and the three functions are realized only by processing the material returning groove, so that the processing is simpler; in addition, in some embodiments, the guiding protrusion 131 may extend along the axial direction of the inner sleeve 130 to an end surface near the side of the residual wall 200, when the outer sleeve 120 is flush with the end surface near the side of the residual wall 200 of the inner sleeve 130, the two end surfaces of the outer sleeve 120 and the inner sleeve 130 form an acting surface capable of tamping the stress dispersion material 400 in the gap 300, the inner sleeve 130 and the outer sleeve 120 are wholly reciprocated along the axial direction of the anchor rod 700, the stress dispersion material 400 in the gap 300 is tamped, the porosity of the stress dispersion material 400 in the gap 300 is reduced, the uniformity of the stress dispersion material 400 is improved, and the bonding strength between the anchor rod 700 and the mounting hole is improved. In some embodiments, the inner sleeve 130 and the outer sleeve 120 may be detachably and fixedly connected to form the inner sleeve 130 and the outer sleeve 120 into a whole, for example, one end of the inner sleeve 130 away from the residual wall 200 extends out of the outer sleeve 120, a plurality of fixing holes are formed on the outer circumferential surface of the inner sleeve 130 and are arranged at intervals along the axial direction of the inner sleeve 130, the outer sleeve 120 is also provided with fixing holes, and a pin sequentially passes through the fixing holes of the outer sleeve 120 and the fixing holes of any inner sleeve 130 to fixedly connect the inner sleeve 130 and the outer sleeve 120; while a plurality of axial fixation holes of inner sleeve 130 may allow inner sleeve 130 and outer sleeve 120 to be fixed in different positions. In addition, the end of inner sleeve 130 remote from residual wall 200 may also be provided with a removable handle 150 for ease of handling. In some embodiments, the guide protrusion 131 is curved in a direction from the root to the head.
The assembly process of filler 100 is as follows: the inner sleeve 130 is inserted into the outer sleeve 120 from one end of the outer sleeve 120 with the pushing groove 123, the limiting sleeve 110 is sleeved outside the outer sleeve 120, the outer sleeve 120 is connected with the feeding groove 140, and the handle 150 is arranged on one side of the inner sleeve 130 far away from the pushing groove 123.
The specific process of filling and ramming the filler 100 is as follows:
Sleeving an inner sleeve 130 of the filler 100 on a cantilever section 710 of an anchor rod 700, wherein the end surface of the outer sleeve 120 is tightly attached to a residual wall 200, a feeding hole 122 of the outer sleeve 120 is close to the residual wall 200, a disassembling handle 150 of the inner sleeve 130 is far away from the residual wall 200, then carbon ramming materials are fed into a feeding trough 140, the positions of the inner sleeve 130 and the outer sleeve 120 are adjusted, so that a feeding hole 122 groove of the outer sleeve 120 is aligned with a through hole 111 of a limiting sleeve 110, the end surface of the inner sleeve 130, which is close to the residual wall 200, is positioned on the side, which is far away from the residual wall 200, of the feeding hole 122, a partition plate 141 in the feeding trough 140 is opened, and a stress dispersion material 400 sequentially enters into a containing cavity from a feeding cavity of the feeding trough 140 through the through hole 111 and the feeding trough, and the partition plate 141 is closed; turning the inner sleeve 130 and the outer sleeve 120 as a whole around the axial direction of the anchor rod 700, fixing the limit sleeve 110, enabling the through hole 111 of the limit sleeve 110 to be communicated with the other feeding hole 122, opening the partition plate 141, enabling the stress dispersion material 400 to enter the accommodating cavity from the feeding cavity of the feeding groove 140 through the through hole 111 and the feeding groove, and so on until the stress dispersion material 400 is uniformly distributed around the cantilever section 710 in the accommodating cavity; pushing inner sleeve 130 axially along anchor bar 700 such that inner sleeve 130 moves toward stub wall 200, the end face of inner sleeve 130 pressing against the receiving cavity such that stress dispersion 400 within the receiving cavity enters gap 300 between anchor bar 700 and the inner wall of the mounting hole until the end face of inner sleeve 130 is flush with the end face of outer sleeve 120; outer sleeve 120 is stationary and inner sleeve 130 is withdrawn such that inner sleeve 130 is away from stub wall 200, thereby reverting to the receiving cavity until inner sleeve 130 is positioned on the side of feed opening 122 away from stub wall 200, and the above-described steps are repeated for feeding and pushing. When the gap 300 between the anchor rod 700 and the inner wall of the mounting hole is filled with more stress fillers, the end faces of the inner sleeve 130 and the outer sleeve 120 are flush when pushing is finished, and the limiting sleeve 110 is not moved, so that the inner sleeve 130 and the outer sleeve 120 integrally reciprocate along the axial direction of the anchor rod 700, and the two flush end faces tamp the fillers in the gap 300, and the tamping force is not less than 5kg.
S2, sleeving a plurality of elastic protective sleeves on the corresponding cantilever sections 710 of the anchor rods 700, and building a ring sleeve mold in the residual cavity, wherein the cantilever sections 710 of the anchor rods 700 are positioned between the ring sleeve mold and the residual wall 200.
Referring to fig. 8, the elastic protective sleeve 800 can protect the anchor rod 700 during the baking process of the casting body 600, so as to prevent the anchor rod 700 from being deformed during the baking stress release of the casting body 600, and even prevent the anchor rod 700 from being broken. The elastic protection sleeve 800 may be made of a plastic material resistant to high temperature, which is required to be not melted at a temperature of 500-600 ℃, and the elastic protection sleeve 800 may be a glass fiber protection sleeve.
S3, adding casting materials into the space between the outer side surface of the ring sleeve mold 500 and the residual wall 200, and drying to form a casting body 600;
S4, removing the loop mould 500 and the plurality of protective sleeves 800, and forming a loop seam between the cantilever section 710 of the anchor rod 700 and the casting body 600;
In actual operation, the inner ring of the core drilling machine is sleeved outside the anchor rod 700, the elastic protective sleeve 800 is ground and washed until the residual wall 200 is leaked, and a ring seam is formed after the elastic protective sleeve 800 is ground and washed; the protective cover 800 may be removed by applying an easily releasable agent to the inner and outer surfaces of the protective cover 800 in advance, and is not particularly limited.
In some embodiments, the difference between the inner and outer diameters of the circumferential seam is 10-30mm.
And S5, filling the annular gaps with filling materials to finish the repair of the blast furnace hearth 1000.
In some embodiments, the filling material is filled into the circumferential seam, specifically including:
And (3) baking the annular seam at 500-600 ℃ for 6-8 hours, and filling the annular seam with a filler, wherein the thermal expansion rate of the filler is between the thermal expansion rate of the anchor rod 700 and the thermal expansion rate of the casting body 600. Thermal expansion ratio refers to the relative percentage of change in volume of a material before and after heat treatment, thermal expansion ratio = (post-heat-receiving volume-pre-heat-receiving volume)/pre-heat-receiving volume×100%. In this embodiment, the filler may be a carbon ramming material, which mainly uses silicon carbide, graphite and electrically calcined anthracite as raw materials, and is added with binding agents such as electric melting cement or composite resin, and the filler is generally used for filling the gap between the blast furnace carbon brick and the sealing plate.
The casting material is baked and molded and then the circumferential seam is baked, so that the subsequent circumferential seam construction is performed as soon as possible, the casting material is baked for a short time, is not baked thoroughly, is uneven in temperature, and can generate cracks and stress concentration. The baking of the casting body 600 can be continued while baking the circumferential seam and the filler, thereby improving the repair efficiency. If the casting material is baked thoroughly, the annular seam is processed, the annular seam is baked and the filling material is baked in sequence, so that the repairing time can be prolonged. The filling material can be selected from the carbon ramming materials.
The method for repairing the blast furnace hearth 1000 according to the present application will be further described with reference to specific examples.
Connection of the anchor rod 700 with the stub wall 200:
The size of the anchor rod 700 is 120mm, the material is the same as that of a hearth 1000 carbon brick, and the original length of the anchor rod 700 is 1m; after the hearth 1000 cleaning port is completed, designing an anchor rod 700 mounting point within a range of 0.7m from the upper part to the lower part of a datum line at a position 1.3m below the central line of a blast furnace taphole channel, wherein the thickness of a residual wall 200 at the mounting point is more than 600mm, the height position can be adjusted up and down on the datum line +/-200 mm, a core drill with the same inner diameter as the anchor rod 700 is used for drilling a mounting hole in the residual wall 200, the diameter of the mounting hole is 10mm larger than that of the anchor rod 700, the depth of the mounting hole is 400 +/-50 mm, and the mounting hole is adjusted according to the thickness of the actual residual wall 200; and (3) drilling mounting holes in the radial range of 0.7-1.0 m in the circumferential direction of 1.3m below the tap hole of the hearth 1000, wherein the depth of the mounting holes is controlled to be 300-250 mm and the mounting holes are arranged around the tap hole in multiple points due to thinner residual bricks near the tap hole. The anchor rods 700 are inserted into the corresponding mounting holes in one-to-one correspondence, and each gap 300 is filled with carbon ramming material in turn by using the stuffing device 100, and rammed.
Connection of anchor rod 700 to casting 600:
An elastic protective sleeve 800 with the thickness of 3mm is sleeved on a cantilever section 710 of each anchor rod 700, a casting mold is built in a residual cavity of a blast furnace hearth 1000, casting materials are injected for casting, the casting mold is removed after maintenance, drying and molding, a core drill is used for grinding a circular seam with the inner diameter and the outer diameter of 10mm at the position between the anchor rod 700 and a casting body 600, the protective sleeve 800 is ground, the circular seam reaches the surface of the residual wall 200, then after the circular seam is baked, a grouter is used for filling refractory materials with good anti-riot performance and the thermal expansion rate between the casting materials and the residual wall 200, and the whole casting body 600 is dried.
By adopting the method provided by the invention, the connection strength of the repaired casting body of the blast furnace hearth 1000 and the residual wall is high, the service life of the blast furnace hearth can reach 3 years, and compared with the method of direct casting repair in the prior art, the service life of the blast furnace hearth is prolonged by more than 2 years.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (10)
1. A method of repairing a blast furnace hearth, the method comprising:
Inserting a plurality of anchor rods arranged at intervals into a residual wall of a blast furnace hearth, wherein the anchor rods are provided with cantilever sections positioned in a residual cavity of the blast furnace hearth;
sleeving a plurality of elastic protective sleeves on the cantilever sections of the corresponding anchor rods, and building a ring sleeve mold in the residual cavity, wherein the cantilever sections of the anchor rods are positioned between the ring sleeve mold and the residual wall;
adding casting materials into the space between the outer side surface of the ring sleeve mold and the residual wall, and drying to form a casting body;
Removing the loop mould and the protective sleeves, and forming a loop seam between the cantilever section of the anchor rod and the casting body;
filling the annular gaps with filling materials to finish the repair of the blast furnace hearth.
2. The method for repairing a hearth of a blast furnace according to claim 1, wherein the anchor rod and the stub wall have the same coefficient of thermal expansion; the diameter of the anchor rod is 100-150mm, and the length of the anchor rod extending into the residual wall is larger than that of the cantilever section.
3. The method for repairing a blast furnace hearth according to claim 2, wherein the length of the anchor rod extending into the residual wall is 350-450mm, and the length of the cantilever section is 200-300mm.
4. The method for repairing a blast furnace hearth according to claim 1, wherein the filling of the circumferential seam with a filler material comprises:
Baking the circular seam at 500-600 ℃ for 6-8 hours, and filling the circular seam with a filler; the thermal expansion rate of the filling material is between the thermal expansion rate of the anchor rod and the thermal expansion rate of the casting body; the difference between the inner diameter and the outer diameter of the circular seam is 10-30mm.
5. The method for repairing a blast furnace hearth according to any one of claims 1 to 4, wherein the inserting a plurality of anchor rods arranged at intervals into the residual wall of the blast furnace hearth specifically comprises:
a plurality of mounting holes which are arranged at intervals are formed in the residual wall of the blast furnace hearth;
And inserting a plurality of anchor rods into the corresponding mounting holes in a coaxial clearance manner, and filling stress dispersion materials into the clearance between the anchor rods and the inner walls of the corresponding mounting holes.
6. The method for repairing a blast furnace hearth according to claim 5, wherein the diameter difference between the anchor rod and the mounting hole is 8-15mm, the anchor rod is positioned below the central line of a tap hole of the blast furnace, and the thickness of a residual wall at the anchor rod is more than or equal to 600mm.
7. The method for repairing a blast furnace hearth according to claim 5, wherein a gap between the anchor rod and the inner wall of the corresponding installation hole is filled with a stress dispersion material by a filler, the filler comprising:
an outer sleeve provided with a feed hole penetrating through the cylinder wall;
The inner sleeve is used for being sleeved outside the anchor rod, the inner sleeve is inserted in the outer sleeve in a coaxial clearance, and the end faces of the inner sleeve are switchably positioned on two sides of the feeding hole along the axial direction of the inner sleeve so as to push out the stress dispersion material entering from the feeding hole outside the outer sleeve.
8. The method for repairing a blast furnace hearth according to claim 7, wherein a plurality of said feed holes are provided, and a plurality of said feed holes are radially distributed centering on an axial direction of said outer sleeve;
the filler also comprises a limit sleeve, the limit sleeve is sleeved outside the outer sleeve in a clearance mode, the limit sleeve is provided with a through hole penetrating through the wall of the cylinder, and the through hole is operatively communicated with any feeding hole.
9. The method for repairing a blast furnace hearth according to claim 7, wherein a guide groove penetrating through a cylindrical wall is provided on a peripheral surface of the outer sleeve, the guide groove having a component in an axial direction of the cylindrical body, the inner sleeve being provided with a guide projection fitted to the guide groove, the guide projection being movably fitted into the guide groove in a longitudinal direction of the guide groove.
10. The method for repairing a blast furnace hearth according to claim 9, wherein the guide groove is communicated with the feed hole and penetrates through to the end of the outer sleeve to form a pushing groove, the guide protrusion is located on the outer peripheral surface of the end of the inner sleeve, and the guide protrusion is movably embedded in the pushing groove.
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| US4381856A (en) * | 1981-07-09 | 1983-05-03 | Nippon Steel Corporation | Method of repairing blast furnace wall lining |
| JP2005320222A (en) * | 2004-04-08 | 2005-11-17 | Sumitomo Metal Ind Ltd | Filling material for blast furnace and method for repairing blast furnace |
| CN105838833A (en) * | 2016-05-25 | 2016-08-10 | 河南华西耐火材料有限公司 | Blast furnace bottom and hearth integral seamless casting refractory overhaul and maintenance method |
| CN107299171A (en) * | 2016-04-14 | 2017-10-27 | 北京瑞尔非金属材料有限公司 | A kind of method and resistance to material liner body for repairing the blast furnace crucibe side wall liner of resistance to material |
| CN111719029A (en) * | 2020-06-23 | 2020-09-29 | 北京联合荣大工程材料股份有限公司 | Method for repairing damaged cooling wall for blast furnace hearth and carbon brick after soaking or being brittle |
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2022
- 2022-11-30 CN CN202211530409.5A patent/CN115820958B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4381856A (en) * | 1981-07-09 | 1983-05-03 | Nippon Steel Corporation | Method of repairing blast furnace wall lining |
| JP2005320222A (en) * | 2004-04-08 | 2005-11-17 | Sumitomo Metal Ind Ltd | Filling material for blast furnace and method for repairing blast furnace |
| CN107299171A (en) * | 2016-04-14 | 2017-10-27 | 北京瑞尔非金属材料有限公司 | A kind of method and resistance to material liner body for repairing the blast furnace crucibe side wall liner of resistance to material |
| CN105838833A (en) * | 2016-05-25 | 2016-08-10 | 河南华西耐火材料有限公司 | Blast furnace bottom and hearth integral seamless casting refractory overhaul and maintenance method |
| CN111719029A (en) * | 2020-06-23 | 2020-09-29 | 北京联合荣大工程材料股份有限公司 | Method for repairing damaged cooling wall for blast furnace hearth and carbon brick after soaking or being brittle |
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