CN115125342B - Prefabricated member with detachable mud sleeve for blast furnace tap hole and installation method of prefabricated member - Google Patents
Prefabricated member with detachable mud sleeve for blast furnace tap hole and installation method of prefabricated member Download PDFInfo
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- CN115125342B CN115125342B CN202110335892.0A CN202110335892A CN115125342B CN 115125342 B CN115125342 B CN 115125342B CN 202110335892 A CN202110335892 A CN 202110335892A CN 115125342 B CN115125342 B CN 115125342B
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/12—Opening or sealing the tap holes
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Blast Furnaces (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
Abstract
A detachable prefabricated member of a mud sleeve for a blast furnace tap hole and an installation method thereof, wherein the prefabricated member of the mud sleeve comprises: the body is of a frustum structure, and a central through hole is formed in the center of the body; the connecting buckle is a disc body, is provided with a connecting through hole at the center and is connected with the upper end face of the body frustum structure with small diameter through a connecting bolt and a nut; two sides of the connecting buckle are symmetrically provided with an ear block respectively, and a connecting rod and a locking nut which are connected with the ear block in a pivot way. The prefabricated member is fired and detachable, and the operations of stirring, baking and the like are not required to be performed manually on site. The method disclosed by the invention is matched with the integral pouring construction of the tap hole, can ensure accurate alignment, complete fixation and tight peripheral combination of prefabricated members, avoids displacement caused by the impact and static pressure in the tapping process, and ensures smooth tapping operation.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a detachable mud sleeve prefabricated member of a blast furnace tap hole and an installation method thereof.
Background
In blast furnace smelting, iron ore fed into a furnace is reduced into liquid molten iron (part of the liquid iron is replaced by pulverized coal, natural gas and the like) by coke (part insoluble in molten iron is changed into slag), and the generated molten iron and slag are discharged through a tap hole channel, wherein the tap hole channel is positioned at the lower edge of a hearth and is mostly a circular straight hole, and the blast furnace smelting mainly comprises a tap hole frame, a protection plate, tap hole protection bricks, a mud sleeve, a flowing tap hole channel and a mud ladle.
The service performance and maintenance of the blast furnace directly determine the long service life of the blast furnace due to the scouring and chemical erosion of slag iron. In recent years, investigation of breakage of blast furnace hearth at home and abroad also shows that almost all breakage is around the tap hole and in the lower region thereof, mainly because the tap hole is more severely operated and more easily eroded than other parts of the hearth.
The tap hole mud sleeve is a joint surface with the corresponding plugging device, namely the mud gun, and the mud sleeve of the blast furnace is inclined downwards by 16.2 degrees. The injected refractory mortar forms a mud bag in the iron notch so as to protect the lining of the inner wall of the blast furnace hearth, and the slag pressure of 60MPa is born when the notch is blocked, so that the method is an important long-life process of the blast furnace. Thus, the mud jacket is an important component affecting the longevity of the blast furnace. The slag iron slag protection brick is made of refractory materials, and the slag iron slag protection brick is mainly used for preventing slag iron from scouring a tap hole, ensuring that the surface of a mud gun and a mud sleeve is tightly sealed when mud is filled into the tap hole, and prolonging the service life of the tap hole.
The main purpose is to clean the iron notch before the notch is blocked, so that when the gun is blocked, no gun is left, the sleeve of the gun and the sleeve can be well matched without gaps, the gun is convenient to beat, and when the iron notch is cleaned, high-pressure air is used for sweeping the iron notch, and the iron notch bonded on the gun is melted through high-temperature iron notch flow. If the iron notch is not cleaned, slag iron is stuck on the iron notch, or the mud sleeve is damaged and deformed, mud is easily generated when the iron notch is blocked, so that the mud sleeve can be damaged, and the hearth life can be influenced.
Therefore, the mud sleeve which is firm, stable and convenient for quick assembly is an important industrial accessory for stabilizing the operation in front of the furnace and ensuring the long service life of the blast furnace.
The original mud sleeve manufacturing method comprises the steps of digging a deep pit with the diameter of 200 mm-250 mm at a tap hole, coating an adhesive, adding 4% of water into fire-resistant mud, uniformly stirring, filling the stirred fire-resistant mud into the deep pit, pressing the fire-resistant mud into a mud sleeve by using a mud gun, and baking the formed mud sleeve by using gas fire to ensure that the formed mud sleeve has enough strength and meets the working condition.
The manufacture and use of the original mud cover have the following problems:
(1) The proportioning and stirring of the mud sleeve casting materials are manually operated by a site stoker, the proportion and stirring are not professional nor accurately controlled, the materials are firstly filled into a taphole frame and are extruded and formed through a mud gun head, and the mud sleeve casting materials actually have the property of being plastic, so that the integrity of the mud sleeve is difficult to ensure in the extrusion, drying and baking processes, the quality of the casting materials after pressing the mud sleeve is difficult to grasp, and whether the mud sleeve is qualified or not can be identified only in actual use;
(2) The mud sleeve is made by heavy physical work, 200 kg of castable is manually stirred on site each time, and the labor intensity is high;
(3) The manufacturing time is long, as the water in the castable needs to be naturally evaporated and later baked by gas fire to promote the molecular structure of the castable to be sintered into a firm whole, the time is usually 3-4 hours or longer, the iron notch cannot be tapped for a long time, the furnace hearth of the blast furnace is abnormally changed, the temperature of the main channel iron is seriously reduced due to the fact that no new molten iron is replaced for a long time, and the working condition of the main channel is easy to cause production accidents;
(4) The temperature of the iron notch area is high and the safety risk is high during production;
(5) Repeatedly making a mud sleeve for a plurality of times because of large fire of the gas at the iron notch, so that the iron notch system can put residual iron and stop production;
(6) The mud sleeve has short service life of only 2-4 weeks.
Disclosure of Invention
The invention aims to provide a prefabricated member of a detachable mud sleeve of a blast furnace tap hole and an installation method thereof, wherein the prefabricated member is manufactured by firing in advance and is detachable without the operations of stirring, baking and the like on site manually; the method disclosed by the invention is matched with the integral pouring construction of the tap hole, can ensure accurate alignment, complete fixation and tight peripheral combination of prefabricated members, avoids displacement caused by the impact and static pressure in the tapping process, and ensures smooth tapping operation.
In order to achieve the above purpose, the technical scheme of the invention is as follows:
a blast furnace tap hole detachable mud sleeve prefabricated member, comprising: the body is of a frustum structure, and a central through hole is formed in the center of the body; the connecting buckle is a disc body, is provided with a connecting through hole at the center and is connected with the upper end face of the body frustum structure with small diameter through a connecting bolt and a nut; two sides of the connecting buckle are symmetrically provided with an ear block respectively, and a connecting rod and a locking nut which are connected with the ear block in a pivot way.
The invention relates to a method for installing a prefabricated member of a detachable mud sleeve of a blast furnace tap hole, which comprises the following steps:
1) Two pressing brick rib plates are arranged at the left side and the right side of the surface of the radial carbon brick of the hearth in the area close to the taphole frame, the periphery of each pressing brick rib plate is welded and fixed with the taphole frame, a plurality of pressing rib plates are vertically welded on the outer side surface of each pressing brick rib plate, and the side, close to the taphole frame, of each pressing rib plate is welded and fixed with the taphole frame;
2) The front part of the inner side of the iron notch frame, which is opposite to the bottom, is welded and provided with an external steel template, the center of the external steel template is provided with a central through hole which can be inserted into a prefabricated member of the mud sleeve, and the upper part of the external steel template is provided with a pouring hole; a plurality of anchoring parts are welded on the inner side of the iron notch frame;
3) Two sides of the outer wall of the gun head of the clay gun are respectively provided with a clamping seat in a protruding way, and the clamping seats are provided with grooves for inserting connecting rods of the connecting buckles; the connecting buckle of the mud sleeve prefabricated member is arranged at the front end of the mud gun head, connecting rods at two sides of the connecting buckle are inserted into grooves of buckling seats at two sides of the outer wall of the mud gun head and locked by locking nuts, and a fixed sleeve on the mud gun is connected with a connecting bolt on the mud sleeve prefabricated member body to enable the fixed sleeve to be connected with the body, so that the mud sleeve prefabricated member is arranged on the mud gun head;
4) Extending the mud sleeve prefabricated member into the iron notch frame through a central through hole preset in an external steel template on the iron notch frame by a mud gun;
5) Pouring construction is carried out after the prefabricated member of the mud sleeve extends into the outer steel template, pouring materials are poured into the iron notch frame through a pouring opening at the upper part of the outer steel template until pouring materials are filled in the inclined openings, so that the iron notch frame and the prefabricated member of the mud sleeve are completely integrated, and finishing treatment is carried out after curing;
6) The connecting rod is connected and buckled in the buckling seat grooves on two sides of the outer wall of the gun head of the mud gun through the unlocking buckle, so that the prefabricated member of the mud sleeve is separated from the gun head of the mud gun.
Preferably, the external steel template is formed by assembling an upper iron plate and a lower iron plate, the lower iron plate is welded firstly, and the upper iron plate is welded after the installation and fixation of the mud sleeve prefabricated member are completed.
Preferably, a plurality of annular grooves are axially formed in the outer wall of the mud sleeve prefabricated member body.
Preferably, asphalt paint or water glass is coated after the welding of the Y-shaped anchoring piece is completed.
According to the method, before the prefabricated member of the mud sleeve is installed, the integral pouring transformation of the iron notch frame is firstly carried out, then the prefabricated member of the mud sleeve meeting the working conditions is fixed into a preset hole of the iron notch frame by utilizing a gun nozzle of a mud gun on site, and pouring seams of pouring materials are carried out through pouring a feeding bevel orifice on the upper part, so that the method for manually manufacturing the mud sleeve is replaced.
The invention has the beneficial effects that:
the original mud sleeve is formed by mixing unshaped refractory materials with water, stirring, and then smearing the mixture into a deep pit, so that the shape is not regular enough, and the mud sleeve is easy to crack due to baking by gas fire.
The invention designs a mud sleeve prefabricated member, is processed into a circular truncated cone shape, has annular grooves on the surface, is arranged at the position of a tap hole and is completely matched with the center of the tap hole, and has the advantages of good thermal shock stability, high strength, corrosion resistance, scouring resistance, good oxidation resistance and difficult defect, so the mud sleeve prefabricated member has long service life (8-12 months), good effect (the mud generation condition during plugging is obviously reduced, the month average is less than 1 time), and can avoid quality accidents such as burst and the like under the high-strength blast furnace smelting condition in production; moreover, the design of the annular groove on the surface of the prefabricated member of the mud sleeve ensures that the prefabricated member and the castable are meshed more tightly, and displacement caused by the impact of iron flow in use is avoided.
Before the prefabricated member of the mud sleeve is installed, the integral pouring transformation of the iron notch frame is firstly carried out, then the prefabricated member of the mud sleeve meeting the working conditions is fixed into a preset hole of the iron notch frame by utilizing a gun nozzle of a mud gun on site, and a pouring joint of pouring materials is carried out by pouring a feeding inclined hole on the upper part; the mortar has the advantages of high strength, long service life and the like, and can replace manual field for mixing, stirring, pressing and baking of the mortar jacket; and in the blast furnace damping down state, the method can be used for installing in place, so that the gas environment in which a mud sleeve is manually manufactured can be avoided, and the occupational health and safety risks are eliminated.
The method disclosed by the invention is matched with the integral pouring construction of the tap hole, can ensure accurate alignment, complete fixation and tight peripheral combination of prefabricated members, avoids displacement caused by the impact and static pressure in the tapping process, and ensures the smooth tapping operation.
Drawings
FIG. 1 is a perspective view of an embodiment of a preform according to the present invention;
FIG. 2 is an elevation view of an embodiment of a preform according to the present invention;
FIG. 3 is a perspective view of a connector link in an embodiment of a preform according to the present invention;
FIG. 4 is a schematic view of a preform installation according to the present invention;
fig. 5 is an assembly schematic diagram of a tap hole frame and a brick pressing rib plate in an embodiment of the invention.
Detailed Description
Referring to fig. 1 to 5, the blast furnace tap hole detachable type mud sleeve prefabricated member of the present invention comprises:
the body 1 is of a frustum structure, and a central through hole is formed in the center of the body;
the connecting buckle 2 is a disc body, is provided with a connecting through hole at the center and is connected with the upper end face of the body 1 with a small diameter of the frustum structure through a connecting bolt 3 and a nut 4; two sides of the connecting buckle 2 are symmetrically provided with an ear block 21 respectively, and a connecting rod 5 and a locking nut 6 which are connected with the ear block 21 in a pivot way.
The invention relates to a method for installing a prefabricated member of a detachable mud sleeve of a blast furnace tap hole, which comprises the following steps:
1) Two adjacent pressing brick rib plates 8 are arranged on the left side and the right side of the surface of a hearth radial carbon brick in the area of the taphole frame 7, the periphery of each pressing brick rib plate 8 is welded and fixed with the taphole frame 7, a plurality of pressing rib plates 11 are vertically welded on the outer side surface of each pressing brick rib plate 8, and the side, close to the taphole frame 7, of each pressing rib plate 11 is welded and fixed with the taphole frame 7; see fig. 5;
2) An external steel template 9 is welded and installed at the front part of the inner side of the iron notch frame 7 opposite to the bottom, a central through hole capable of being inserted into a prefabricated member of the mud sleeve is formed in the center of the external steel template 9, and a pouring hole is formed in the upper part of the external steel template 9; a plurality of anchoring pieces are welded on the inner side of the iron notch frame 7;
3) Two sides of the outer wall of the gun head 101 of the gun 100 are respectively provided with a clamping seat 102 in a protruding mode, and grooves for inserting the connecting rods 5 of the connecting buckles 2 are formed in the clamping seats 102; arranging a connecting buckle 2 of a mud sleeve prefabricated member at the front end of a mud gun head 101, inserting connecting rods 5 at two sides of the connecting buckle 2 into grooves of buckling seats 102 at two sides of the outer wall of the mud gun head, locking by locking nuts 6, and connecting a fixed sleeve 103 on the mud gun 100 with a connecting bolt on a body 1 to connect the fixed sleeve 103 with the body 1, wherein the mud sleeve prefabricated member is arranged on the mud gun head 101;
4) Extending the mud sleeve prefabricated member into the iron notch frame through a central through hole preset in an external steel template on the iron notch frame by a mud gun;
5) Pouring construction is carried out after the prefabricated member of the mud sleeve extends into the outer steel template, pouring materials are poured into the iron notch frame through a pouring opening at the upper part of the outer steel template until pouring materials are filled in the inclined openings, so that the iron notch frame and the prefabricated member of the mud sleeve are completely integrated, and finishing treatment is carried out after curing;
6) The connecting rod is connected and buckled in the buckling seat grooves on two sides of the outer wall of the gun head of the mud gun through the unlocking buckle, so that the prefabricated member of the mud sleeve is separated from the gun head of the mud gun.
Preferably, the external steel template is formed by assembling an upper iron plate and a lower iron plate, the lower iron plate is welded firstly, and the upper iron plate is welded after the installation and fixation of the mud sleeve prefabricated member are completed.
Preferably, a plurality of annular grooves are axially formed in the outer wall of the mud sleeve prefabricated member body.
Preferably, asphalt paint or water glass is coated after the welding of the Y-shaped anchoring piece is completed.
Examples
The prefabricated member of the mud sleeve is in a truncated cone shape and a horn shape, the inner diameter is 80mm, the bottom circle diameter is 400mm, the top circle diameter is about 350mm, the height is 250mm, an annular groove is formed in the outer side, the depth is 10mm, and the annular groove completely and equally penetrates the whole prefabricated member.
The prefabricated member of the taphole mud sleeve is mounted in the pre-buried earlier stage, and the taphole frame is integrally poured and modified at first: the method comprises the steps of protective layer brick disassembly, brick pressing rib plate cutting, permanent layer brick disassembly, carbon brick pressing rib plate welding and anchor part welding, clay gun alignment and matching, external steel template welding and installation, mold core alignment and installation, castable construction, curing and mold stripping.
The welding mode and the requirements of the brick pressing rib plates are as follows: and (3) moving the brick pressing rib plate to the carbon brick part, wherein the thickness of the brick pressing rib plate is 20mm by adopting A3 steel. During construction, the left brick pressing rib plate and the right brick pressing rib plate are tightly attached to the carbon bricks, and two sides of the left brick pressing rib plate and the right brick pressing rib plate are respectively attached to the carbon bricksFive pointsAnd (3) spot-welding the steel plates on the iron frame, then welding four rib pressing plates on each side of the brick rib plates, simultaneously welding the rib pressing plates with the iron frame, wherein the rib pressing plates are required to be fully welded, the welding seams are not provided with air holes, and the welding seams are uniform.
Anchor welding mode and requirement: the welding of the Y-shaped anchoring piece of the iron plate at the iron notch is required to be full, the anchoring nail is made of Gr25Ni20, the diameter is phi 10mm, the height is 120-150 mm, the welding interval is 100X 100mm, and asphalt paint or water glass is coated after the anchoring nail is welded.
The clay gun alignment and matching are needed before the template is installed, and the clay gun alignment and matching are mainly used for fixing the inner side of the mold core by punching holes with the depth of 30-40 mm on the refractory material in the iron notch.
When the external steel template is welded and installed, holes with the size of 400mm are reserved in the outer template, the installation should ensure that the holes are accurate in the size and the inclination angle (10 ℃) of the mud blast holes, and pouring material filling holes with the size of 400mm are reserved on the upper part of the external steel template. The outer steel forms are formed by assembling upper and lower iron plates, the lower half steel forms are welded firstly, and the upper half steel forms are welded after the mold cores are installed and fixed.
Before casting, a bevel opening is manufactured on the upper part of a casting opening reserved by an external steel template and is used as a feeding opening, and the height of the bevel opening is higher than the casting height by not less than 100mm.
After the die is disassembled, the prefabricated member of the taphole mud sleeve is installed, the positioning is carried out by fixing a mud gun on a taphole, the prefabricated member of the mud sleeve is fixed into a preset hole of a taphole frame by utilizing a field mud gun nozzle, and a pouring joint is formed by pouring a feeding bevel through the upper part. And (3) pouring is completed once, and finally pouring is carried out until the inclined openings are filled with the castable, and the annular grooves of the prefabricated member of the mud sleeve are filled, so that the iron notch frame and the prefabricated member of the mud sleeve are completely integrated, and after the health maintenance, finishing treatment is carried out.
Claims (5)
1. A removable mud sleeve prefabricated member for a blast furnace tap hole, which is characterized by comprising:
the body is of a frustum structure, and a central through hole is formed in the center of the body;
the connecting buckle is a disc body, is provided with a connecting through hole at the center and is connected with the upper end face of the body frustum structure with small diameter through a connecting bolt and a nut; two sides of the connecting buckle are symmetrically provided with an ear block respectively, and a connecting rod and a locking nut which are connected with the ear block in a pivot way.
2. The method for installing a blast furnace detachable mud sleeve prefabricated member according to claim 1, comprising the following steps:
1) Two pressing brick rib plates are arranged at the left side and the right side of the surface of the radial carbon brick of the hearth in the area close to the taphole frame, the periphery of each pressing brick rib plate is welded and fixed with the taphole frame, a plurality of pressing rib plates are vertically welded on the outer side surface of each pressing brick rib plate, and the side, close to the taphole frame, of each pressing rib plate is welded and fixed with the taphole frame;
2) The front part of the inner side of the iron notch frame, which is opposite to the bottom, is welded and provided with an external steel template, the center of the external steel template is provided with a central through hole which can be inserted into a prefabricated member of the mud sleeve, and the upper part of the external steel template is provided with a pouring hole; a plurality of anchoring parts are welded on the inner side of the iron notch frame;
3) Two sides of the outer wall of the gun head of the clay gun are respectively provided with a clamping seat in a protruding way, and the clamping seats are provided with grooves for inserting connecting rods of the connecting buckles; the connecting buckle of the mud sleeve prefabricated member is arranged at the front end of the mud gun head, connecting rods at two sides of the connecting buckle are inserted into grooves of buckling seats at two sides of the outer wall of the mud gun head and locked by locking nuts, and a fixing sleeve on the mud gun is connected with a connecting bolt on the body to enable the fixing sleeve to be connected with the body, so that the mud sleeve prefabricated member is arranged on the mud gun head;
4) Extending the mud sleeve prefabricated member into the iron notch frame through a central through hole preset in an external steel template on the iron notch frame by a mud gun;
5) Pouring construction is carried out after the prefabricated member of the mud sleeve extends into the outer steel template, pouring materials are poured into the iron notch frame through a pouring opening at the upper part of the outer steel template until pouring materials are filled in the inclined openings, so that the iron notch frame and the prefabricated member of the mud sleeve are completely integrated, and finishing treatment is carried out after curing;
6) The connecting rod is connected and buckled in the buckling seat grooves on two sides of the outer wall of the gun head of the mud gun through the unlocking buckle, so that the prefabricated member of the mud sleeve is separated from the gun head of the mud gun.
3. The method for installing a prefabricated member for a removable type tap hole of a blast furnace according to claim 2, wherein the outer steel form is formed by assembling upper and lower iron plates, welding the lower iron plate, and welding the upper iron plate after the prefabricated member for a tap hole of a blast furnace is installed and fixed.
4. The method for installing a prefabricated member for a detachable mud sleeve for a blast furnace tap hole as set forth in claim 2, wherein the outer wall of the prefabricated member for a mud sleeve is provided with a plurality of annular grooves along the axial direction.
5. The method for installing a removable muzzle prefabricated member for a blast furnace tap hole according to claim 2, wherein the anchoring member is coated with asphalt paint or water glass after welding.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110335892.0A CN115125342B (en) | 2021-03-29 | 2021-03-29 | Prefabricated member with detachable mud sleeve for blast furnace tap hole and installation method of prefabricated member |
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| CN202110335892.0A CN115125342B (en) | 2021-03-29 | 2021-03-29 | Prefabricated member with detachable mud sleeve for blast furnace tap hole and installation method of prefabricated member |
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| CN115125342B true CN115125342B (en) | 2023-08-11 |
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