CN109457074B - Blast furnace bottom pressure-resistant design scheme - Google Patents
Blast furnace bottom pressure-resistant design scheme Download PDFInfo
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- CN109457074B CN109457074B CN201811576600.7A CN201811576600A CN109457074B CN 109457074 B CN109457074 B CN 109457074B CN 201811576600 A CN201811576600 A CN 201811576600A CN 109457074 B CN109457074 B CN 109457074B
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Abstract
The blast furnace bottom pressure resistance design scheme provided by the invention comprises a hemispherical bottom, a half oblate spherical bottom and a rigid bottom, wherein the rigid bottom also comprises five specific structural forms; the semi-spherical furnace bottom and the half of the oblate spherical furnace bottom comprise basic components such as an annular supporting skirt board (3), supporting ribs (18), a heat dissipation window (4), an annular base (5) and the like; the rigid furnace bottom utilizes the huge bonding strength formed by the staggered welding of the radial rib plates (11) or the strip rib plates (15) and the blast furnace shell (1) to tightly pull the blast furnace shell to prevent the blast furnace shell from rising, utilizes the large-area contact welding of the rib plates and the furnace bottom plate to fully exert the supporting force of the rib plates, prevents the furnace bottom plate from generating any deformation such as bulging, upwarping and the like, can completely meet the pressure-resistant requirement of the blast furnace as long as the width and the thickness of the rib plates are accurately calculated, are properly selected and are firmly welded, and has the advantages of low manufacturing difficulty, low manufacturing cost and easy implementation.
Description
Technical Field
The invention relates to the field of blast furnace bottoms, in particular to a design scheme for improving the pressure resistance grade (capacity) of the blast furnace bottom.
Background
In China and even in the world, blast furnaces for iron making or iron alloy production have furnace bottom structures which are not designed according to the pressure resistance standard no matter the size of the blast furnaces, so that the problems of furnace bottom gas leakage, furnace body rising, furnace bottom plate upwarping and the like can occur after a plurality of blast furnaces are produced for a period of time.
Through domestic patent retrieval and query, several patents about the aspects of governing 'furnace bottom plate upwarping' and governing 'furnace bottom gas leakage' and 'furnace bottom plate sealing' are retrieved, but all belong to the technologies already used and have no great innovation; two designs have been found for the "two hearth layers" and the "fillet" design for the "hearth corners", which, although an improvement over the previous designs, are still not sufficiently pressure-resistant and are essentially different from the present invention. Several more typical patents on blast furnace bottoms are identified below for review and screening purposes.
1. The patent of the publication No. CN105063263A of blast furnace hearth structure mainly relates to the sealing treatment between the inner side of a furnace shell and a furnace bottom plate and the sealing treatment between the outer side of the furnace shell and a concrete foundation, and it can be easily seen that the flexible connection between the furnace bottom plate and the furnace shell can not prevent the downward thrust of the pressure in the furnace to the furnace bottom, so that the pressure is not resisted, and once the pressure in the furnace rises to exceed the dead weight of the furnace shell (including the weight of other equipment attached to the furnace shell), the furnace shell or a furnace body can be pulled up (namely the furnace bottom rises or the furnace body rises in the industry).
2. Blast furnace bottom CN104313217A, the furnace bottom of the patent is provided with a double-layer sealing plate (namely a furnace bottom plate), but the welding seam at the joint between the sealing plate and the furnace shell is easy to be pulled open, because the furnace shell expands along with the rise of temperature and pressure, not only expands longitudinally, but also expands transversely or circumferentially, therefore, the diameter of the furnace shell is enlarged after the furnace shell expands circumferentially, once the diameter of the furnace shell is enlarged, the welding seam between the furnace shell and the sealing plate of the furnace bottom is easy to be pulled open, and the furnace bottom is easy to leak gas; as the circumferential expansion diameter of the furnace shell is increased, the periphery of the heat-resistant concrete between two layers of furnace bottom plates can be separated from the production of the furnace shell, once the periphery of the heat-resistant concrete is separated from the production of the furnace shell, the sealing performance of the heat-resistant concrete disappears, and the rigid supporting capacity of the heat-resistant concrete core to the double-layer sealing plate (namely the furnace bottom plate) is lost, so that the scheme is not pressure-resistant.
3. A blast furnace hearth (CN 107164590A), which is an improvement over the above CN105063263A and CN104313217A, has the advantages that the hearth is provided with two layers of sealing plates, and the sealing treatment is also carried out between the outer side of a furnace shell and a concrete foundation, but the structure is not pressure-resistant, particularly when the internal working pressure of a large-scale blast furnace is increased to 0.5Mpa, the downward thrust force acting on the hearth in the furnace can reach more than 5000 tons, and the structure is not pressure-resistant enough.
4. The application number of blast furnace bottom structure is: 2015207269589, the arc connection (or called fillet connection) is adopted at the corner of the furnace bottom and the furnace shell, the bottom bolt and the reinforcing rib are added outside, but the furnace bottom plate is still flat, the pressure resistance degree is improved compared with the above ones, but the structure is not a real pressure resistance structure, once the pressure is increased to a certain degree, the furnace bottom can also be downwards expanded, seen from the surrounding appearance, the bottom is expanded, and the furnace bottom plate is upwarped (which is commonly called as "bottom expansion" or "furnace bottom plate upwarp" in the industry, and is actually caused by "furnace body expansion"), the thick bottom bolt can be even broken due to the "bottom expansion" or "furnace bottom plate upwarp", and reports and articles about the breaking of the bottom expansion bottom bolt can be found in the journal of the iron making or steel metallurgy.
Aiming at the defects of the prior art represented by the patent, the invention particularly provides a blast furnace bottom pressure resistance design scheme which is convenient for blast furnace designers and managers to select, so as to improve the pressure resistance level of the blast furnace bottom, thoroughly avoid the problems of upwarping of a furnace bottom plate, gas leakage of the furnace bottom, rising of a furnace body and the like of the blast furnace, ensure the safety and long service life of the blast furnace and improve the economic benefit of iron and steel enterprises.
Disclosure of Invention
The invention aims to solve the problems that the existing blast furnace bottom is generally not pressure-resistant or is insufficient in pressure-resistant degree, and particularly provides a blast furnace bottom pressure-resistant design scheme so as to improve the pressure-resistant level of the blast furnace bottom, thereby avoiding or thoroughly avoiding the problems of furnace bottom plate upwarping, furnace bottom gas leakage, furnace body rising and the like of the blast furnace, ensuring the safety and long service life of the blast furnace, and improving the economic benefit of iron and steel enterprises.
The blast furnace bottom pressure resistance design scheme mainly comprises three types, wherein the first type is a hemispherical bottom design scheme; secondly, a design scheme of a spherical furnace bottom of a half oblate (the oblate is a round shape from a top view, an oval shape from left, right, main and rear views, and 1/2 is a horizontal cross section of the oblate shape) is adopted; the third is a rigid furnace bottom design scheme (the rigid furnace bottom structure is that the huge bonding strength formed by the staggered welding of the ribbed plate and the furnace shell is utilized to pull the furnace shell to prevent the furnace shell from rising, and the ribbed plate is utilized to be in large-area contact welding with the furnace bottom plate to fully exert the supporting force of the ribbed plate so that the furnace bottom plate does not generate bulging or deformation), and five specific structural forms are provided in the rigid furnace bottom design scheme.
The design scheme of the hemispherical furnace bottom comprises the hemispherical furnace bottom, an annular supporting skirt plate, supporting ribs, a heat dissipation window, an annular base, footing bolts, a blast furnace shell, a concrete foundation and other basic components; the lower part of the footing bolt is embedded in the concrete foundation, an annular base is arranged on the concrete foundation, the upper surface of the annular base is welded with the lower end of the annular supporting skirt plate, and the upper end of the annular supporting skirt plate is welded with the blast furnace shell; a hemispherical furnace bottom is arranged and welded in a space enclosed by the annular supporting skirt plate below a blast furnace shell; a plurality of heat dissipation windows are arranged on the circumference of the annular supporting skirt plate; a plurality of supporting ribs are welded on the outer circle of the annular supporting skirt plate from the upper part to the lower part of the blast furnace shell to the annular base and are used for assisting the annular supporting skirt plate to support the weight of furnace body equipment (including furnace burden).
The design of the half-oblate spherical furnace bottom comprises basic components such as a half-oblate spherical furnace bottom, an annular supporting skirt board, supporting ribs, a heat dissipation window, an annular base, a footing bolt, a blast furnace shell, a concrete foundation and the like; the lower part of the footing bolt is embedded in the concrete foundation, an annular base is arranged on the concrete foundation, the upper surface of the annular base is welded with the lower end of the annular supporting skirt plate, and the upper end of the annular supporting skirt plate is welded with the blast furnace shell; a half of oblate spherical furnace bottom is arranged and welded in a space enclosed by the annular supporting skirt plate below a blast furnace shell; a plurality of heat dissipation windows are arranged on the circumference of the annular supporting skirt plate; a plurality of supporting ribs are welded on the outer circle of the annular supporting skirt plate from the upper part to the lower part of the blast furnace shell to the annular base and are used for assisting the annular supporting skirt plate to support the weight of furnace body equipment (including furnace burden).
One of the design schemes of the rigid furnace bottom is that a furnace bottom plate is arranged on a concrete foundation, a radial ribbed plate and an annular ribbed plate are welded on the furnace bottom plate, the annular ribbed plate is arranged and welded in the central area of the furnace bottom plate, and the radial ribbed plate is welded around the annular ribbed plate; installing the blast furnace shell according to the shell installation position mark and the arrow indication direction, and aligning the cutting sockets at the lower part of the blast furnace shell to the corresponding radial rib plates one by one during installation; or the blast furnace shell can be welded on the furnace bottom plate, and then the radial rib plates are penetrated into cutting sockets reserved at the lower part of the blast furnace shell one by one and then are welded firmly.
The second design scheme of the rigid furnace bottom is that the furnace bottom plate is arranged on a concrete foundation, the radial rib plates are welded on the furnace bottom plate, the intersection points of the radial rib plates can be positioned at the center of the furnace bottom plate, if the radial rib plates are staggered to some extent or a steel bar is placed at the center for the convenience of welding, the blast furnace shell can be welded on the furnace bottom plate, and then the radial rib plates penetrate into cutting sockets reserved at the lower part of the blast furnace shell one by one and are welded firmly.
The third design scheme of the rigid furnace bottom is that the furnace bottom plate is installed on a concrete foundation, and the strip-shaped rib plates are welded on the furnace bottom plate in parallel, or the blast furnace shell is welded on the furnace bottom plate first, and then the strip-shaped rib plates penetrate into cutting sockets reserved in advance at the lower part of the blast furnace shell one by one and are welded firmly.
The fourth design scheme of the rigid furnace bottom is that strip-shaped rib plates are welded on the bottom plate of the furnace vertically and horizontally to form a grid structure, and the strip-shaped rib plates can be cut at the intersection and then are installed and welded by a mutual buckling method; or the blast furnace shell is welded on the furnace bottom plate, then the strip rib plates in one direction are penetrated and welded firmly from the cutting insertion openings reserved in advance at the lower part of the blast furnace shell one by one, and then the strip rib plates in the other direction are cut into small blocks according to the grid size and then welded.
The fifth design scheme of the rigid furnace bottom is that radial rib plates or a combination of the radial rib plates and annular rib plates or a full-strip rib plate or a net structure combined by the strip rib plates are welded on the furnace bottom plate, then the furnace bottom plate comprises the rib plates, the rib plates are reversed, one surface of each rib plate is placed on a concrete foundation to form a pressure-resistant furnace bottom structure below the rib plate, and then reinforcing angles are welded around the blast furnace shell to enable the rib plates to be firmly combined with the furnace bottom plate.
The radial rib plates, the annular rib plates and the strip rib plates are made of materials, have thickness and width (or called height), and are arranged at a certain density according to the size of a specific blast furnace, the pressure in the furnace, the area of the furnace bottom and the stress condition of the furnace bottom.
The inner parts of the hemispherical furnace bottom and the half of oblate spherical furnace bottom comprise a furnace shell with a rib plate arranged below a furnace bottom plate and above the furnace bottom plate, heat-resistant concrete is required to be poured between the rib plate and the rib plate of a rigid furnace bottom with the rib plate arranged above the furnace bottom plate, the upper surface of the rib plate is leveled according to a designed elevation, then a water-cooled tube or an air-cooled tube is arranged on the leveling layer, corrugated compensators are required to be arranged at two ends of each tube so as to meet the requirements of pressure resistance, expansion and contraction and sealing, refractory materials with good heat conductivity are poured between the water-cooled tube or the air-cooled tube and around the water-cooled tube or the air-cooled tube, and the upper surface is leveled again according to the designed elevation so as to; before pouring heat-resistant concrete, the rigid furnace bottom is provided with a grouting hole and welded with a grouting pipe, the grouting pipe is used for grouting and filling between the lower surface of the furnace bottom and a concrete foundation, the grouting pipe is cut after the grouting material is solidified, the grouting hole is sealed and welded firmly, then the heat-resistant concrete is poured and leveled, then a water-cooled pipe or an air-cooled pipe is installed on a leveling layer, corrugated compensators are needed to be installed at two ends of each pipe so as to meet the requirements of pressure resistance, expansion and contraction and sealing, finally refractory materials with good heat conductivity are poured between the water-cooled pipe or the air-cooled pipe and around the water-cooled pipe or the air-cooled pipe, and the upper surface is leveled again according to the designed elevation so as to build the carbon brick of the furnace bottom.
Compared with the prior art, the blast furnace bottom pressure resistance design scheme of the invention has the following outstanding advantages and beneficial effects: the semi-spherical furnace bottom in the scheme belongs to the structure with the best pressure resistance degree; the spherical hearth bottom of one-half oblate (the oblate is circular from the top view, oval from the left view, the right view, the main view and the rear view, and 1/2 is the horizontal cross section of the oblate) is also a pressure-resistant structure with very good pressure resistance degree; the other five rigid furnace bottom structures can tightly pull the furnace shell to prevent the furnace shell from rising by utilizing the huge bonding strength formed by the staggered welding of the rib plates and the furnace shell, and the large-area contact welding of the rib plates and the furnace bottom plate is utilized to fully exert the supporting force of the rib plates so that the furnace bottom plate does not generate any deformation such as bulging and the like. In a word, as long as the technical scheme is implemented, the blast furnace bottom with the pressure-resistant design can be obtained, and the problems of furnace bottom plate upwarping, furnace bottom gas leakage, furnace body rising and the like of the blast furnace can be thoroughly avoided or avoided, so that the safety and the long service life of the blast furnace can be ensured, and the economic benefit of steel enterprises can be improved.
Drawings
FIG. 1 is a schematic sectional view of a hemispherical bottom of the furnace of the present invention;
FIG. 2 is a schematic cross-sectional view of a one-half oblate spherical hearth according to the invention;
FIG. 3 is a schematic view of the assembly of the rigid hearth and the blast furnace shell with the combined use of the "annular and radial ribs" of the present invention;
FIG. 4 is a schematic plan view of the rigid hearth floor for the combined use of "annular ribs and radial ribs" of the present invention (i.e., view A-A in FIG. 3);
FIG. 5 is a schematic plan view of a rigid furnace floor of the "radial rib center intersection" type of the present invention;
FIG. 6 is a schematic plan view of a rigid furnace bottom incorporating an all "rib" of the present invention;
FIG. 7 is a schematic plan view of a rigid hearth of the present invention having a "lattice structure" of "rib strips";
FIG. 8 is a schematic view of the rigid hearth structure of the present invention having "ribs" below the hearth floor, wherein "annular ribs and radial ribs" or full "rib bars" or "rib bars" are arranged in a "lattice structure" of "rib bars".
Description of reference numerals: in the figure, 1, a blast furnace shell, 2, a hemispherical furnace bottom, 3, an annular supporting skirt board, 4, a heat dissipation window, 5, an annular base, 6, a footing bolt, 7, a concrete furnace base, 8, a half oblate spherical furnace bottom, 9, a cutting socket, 10, a furnace bottom plate, 11, a radial rib plate, 12, an annular rib plate, 13, a bolt hole, 14, a furnace shell installation position mark (a double-dot chain line in the figure), 15, a strip rib plate, 16, heat-resistant concrete, 17, a reinforcing angle, 18 and a supporting rib, wherein ↓' in figure 3 indicates that the furnace shell is installed downwards.
Detailed Description
The blast furnace bottom pressure resistance design scheme of the present invention will be described in detail below with reference to the description and the accompanying drawings in conjunction with specific embodiments.
The specific embodiments of the blast furnace bottom pressure resistance design scheme have three types, namely a hemispherical furnace bottom design scheme; secondly, a design scheme of a spherical furnace bottom of a half oblate shape (the oblate shape is a circle in the overlooking angle, an ellipse in the left view, the right view, the main view and the rear view, and 1/2 is a horizontal cross section of the oblate shape); thirdly, a rigid furnace bottom design scheme (the rigid furnace bottom utilizes the huge bonding strength formed by staggered welding of the ribbed plate and the furnace shell to pull the furnace shell to prevent the furnace shell from rising, and the ribbed plate is in large-area contact welding with the furnace bottom plate to fully exert the supporting force of the ribbed plate so that the furnace bottom plate does not generate bulging or deformation). There are five specific structural forms in the design scheme of the rigid furnace bottom.
The design scheme of the hemispherical furnace bottom comprises basic components such as the hemispherical furnace bottom (2), an annular supporting skirt plate (3), a supporting rib (18), a heat dissipation window (4), an annular base (5), a footing bolt (6), a blast furnace shell (1), a concrete foundation (7) and the like; the lower parts of the footing bolts (6) are embedded in the concrete foundation (7), the annular base (5) is installed on the concrete foundation (7), the upper surface of the annular base (5) is welded with the lower end of the annular supporting skirt plate (3), and the upper end of the annular supporting skirt plate (3) is welded with the blast furnace shell (1); a hemispherical furnace bottom (2) is arranged and welded in a space enclosed by an annular supporting skirt board (3) below a blast furnace shell (1); a plurality of heat dissipation windows (4) are arranged on the circumference of the annular supporting skirt board (3); a plurality of supporting ribs (18) are welded on the outer circle of the annular supporting skirt board (3) from the upper part to the lower part of the blast furnace shell (1) to the annular base (5) for assisting the annular supporting skirt board (3) to support the weight of furnace body equipment (including furnace burden).
In the design scheme of the half-oblate spherical furnace bottom, the furnace comprises basic components such as a half-oblate spherical furnace bottom (8), an annular supporting skirt board (3), supporting ribs (18), a heat dissipation window (4), an annular base (5), a foot bolt (6), a blast furnace shell (1), a concrete foundation (7) and the like; the lower parts of the footing bolts (6) are embedded in the concrete foundation (7), the annular base (5) is installed on the concrete foundation (7), the upper surface of the annular base (5) is welded with the lower end of the annular supporting skirt plate (3), and the upper end of the annular supporting skirt plate (3) is welded with the blast furnace shell (1); a half oblate spherical furnace bottom (8) is arranged and welded in a space enclosed by an annular supporting skirt board (3) below a blast furnace shell (1); a plurality of heat dissipation windows (4) are arranged on the circumference of the annular supporting skirt board (3); a plurality of supporting ribs (18) are welded on the outer circle of the annular supporting skirt board (3) from the upper part to the lower part of the blast furnace shell (1) to the annular base (5) for assisting the annular supporting skirt board (3) to support the weight of furnace body equipment (including furnace burden).
One of the concrete structural forms of the rigid furnace bottom design scheme is that a furnace bottom plate (10) is installed on a concrete foundation (7), a radial rib plate (11) and an annular rib plate (12) are welded on the furnace bottom plate (10), the annular rib plate (12) is installed and welded in the central area of the furnace bottom plate (10), and the radial rib plate (11) is welded around the annular rib plate; installing the blast furnace shell (1) according to the shell installation position mark (14) and the direction indicated by an arrow, and aligning the cutting jacks (9) at the lower part of the blast furnace shell (1) one by one to the corresponding radial rib plates (11) during installation; or the blast furnace shell (1) can be welded on the furnace bottom plate (10) firstly, and then the radial rib plates (11) are penetrated into cutting sockets (9) reserved in advance at the lower part of the blast furnace shell (1) one by one and then are welded firmly.
The second design scheme of the rigid furnace bottom is that a furnace bottom plate (10) is installed on a concrete foundation (7), a radial rib plate (11) is welded on the furnace bottom plate (10), the intersection point of the radial rib plate (11) can be located at the center of the furnace bottom plate (10), if a steel bar is placed at the center or can be dislocated to some extent for the convenience of welding, a blast furnace shell (1) can be welded on the furnace bottom plate (10) first, and then the radial rib plate (11) is penetrated into a cutting socket (9) reserved in advance at the lower part of the blast furnace shell (1) one by one and then is welded firmly.
The third concrete structural form of the design scheme of the rigid furnace bottom is that a furnace bottom plate (10) is installed on a concrete foundation (7), a strip-shaped rib plate (15) is welded on the furnace bottom plate (10) in parallel, or a blast furnace shell (1) can be welded on the furnace bottom plate (10) firstly, and then the strip-shaped rib plate (15) penetrates into a cutting socket (9) reserved in advance at the lower part of the blast furnace shell (1) one by one and is then welded firmly.
Fourthly, welding strip-shaped rib plates (15) on a furnace bottom plate (10) longitudinally and transversely simultaneously to form a grid structure, wherein the strip-shaped rib plates (15) can be cut at the intersection part and then are installed and welded by a mutual buckling method; or the blast furnace shell (1) can be welded on the furnace bottom plate (10) firstly, then the strip rib plates (15) in one direction are penetrated and welded firmly from the cutting insertion holes (9) reserved in advance at the lower part of the blast furnace shell one by one, and then the strip rib plates (15) in the other direction are cut into small blocks according to the grid size and then are welded.
The fifth concrete structural form of the design scheme of the rigid furnace bottom is that a radial rib plate (11) or a combination of the radial rib plate (11) and an annular rib plate (12) or a full-strip rib plate (15) or a 'net-shaped structure' formed by combining the strip rib plates (15) can be welded on a furnace bottom plate (10), then the furnace bottom plate (10) comprises the 'rib plates' and is reversed, one surface of the 'rib plate' is arranged on a concrete foundation (7) to form a pressure-resistant structure below the 'rib plate', and then a reinforcing angle (17) is welded around a blast furnace shell (1) to be firmly combined with the furnace bottom plate (10).
The radial rib plates (11), the annular rib plates (12) and the strip rib plates (15) are made of materials, thickness and width (or called height), and the arrangement density of the rib plates are calculated and determined according to the size of a specific blast furnace, the pressure in the furnace, the area of the furnace bottom and the stress condition of the furnace bottom.
The inner parts of the hemispherical furnace bottom and the half of oblate spherical furnace bottom comprise a furnace shell with a rib plate below a furnace bottom plate and above the furnace bottom plate, heat-resistant concrete is required to be poured between the rib plate and the rib plate of a rigid furnace bottom with the rib plate above the furnace bottom plate, the upper surface of the rib plate is leveled according to a designed elevation, then a water-cooled tube or an air-cooled tube is arranged on the leveling layer, corrugated compensators are required to be arranged at two ends of each tube so as to meet the requirements of pressure resistance, expansion and contraction and sealing, refractory materials with good heat conductivity are poured between the water-cooled tube or the air-cooled tube and around the water-cooled tube or the air-cooled tube, and the upper surface is leveled again according to the designed elevation so as to build carbon bricks; before pouring heat-resistant concrete, the rigid furnace bottom is provided with a grouting hole and welded with a grouting pipe, the grouting pipe is used for grouting and filling between the lower surface of the furnace bottom and a concrete foundation, the grouting pipe is cut after the grouting material is solidified, the grouting hole is sealed and welded firmly, then the heat-resistant concrete is poured and leveled according to a designed elevation, then a water-cooled pipe or an air-cooled pipe is arranged on a leveling layer, corrugated compensators are required to be arranged at two ends of each pipe so as to meet the requirements of pressure resistance, expansion and contraction and sealing, finally a refractory material with good heat conductivity is poured between the water-cooled pipe or the air-cooled pipe and around the water-cooled pipe or the air-cooled pipe, and the upper surface is leveled again according to the designed elevation so as to build the carbon brick of the furnace bottom.
Seven preferred embodiments of the present invention of three categories are described in detail above. Whether any one of a hemispherical bottom or a half oblate spherical bottom or a rigid bottom is adopted or some deformation is carried out under the condition of the basic shape, the protection scope of the invention is only required to adopt a scheme similar to the description of the patent for improving the rigidity of the blast furnace bottom or improving the pressure resistance degree of the bottom; and that various modifications and changes may be made by those skilled in the art without the use of inventive faculty, or that the technical solutions obtained by means of logical analysis, reasoning or limited experiments on the basis of the prior art according to the conception of the invention shall fall within the scope of the invention defined by the claims.
Claims (3)
1. Blast furnace stove bottom pressure resistant structure, its characterized in that: the blast furnace bottom pressure-resistant structure adopts a rigid furnace bottom structure, and the rigid furnace bottom structure comprises five specific structural forms;
one of the rigid furnace bottom structures is that a furnace bottom plate (10) is arranged on a concrete foundation (7), a radial rib plate (11) and an annular rib plate (12) are welded on the furnace bottom plate (10), the annular rib plate (12) is arranged and welded in the central area of the furnace bottom plate (10), and the radial rib plate (11) is welded around the annular rib plate; installing the blast furnace shell (1) according to the shell installation position mark (14) and the direction indicated by an arrow, and aligning the cutting jacks (9) at the lower part of the blast furnace shell (1) one by one to the corresponding radial rib plates (11) during installation; or firstly welding the blast furnace shell (1) on the furnace bottom plate (10), and then penetrating the radial rib plates (11) one by one from cutting sockets (9) reserved in advance at the lower part of the blast furnace shell (1) and then firmly welding;
the second rigid furnace bottom structure is characterized in that a furnace bottom plate (10) is arranged on a concrete foundation (7), a radial rib plate (11) is welded on the furnace bottom plate (10), the intersection point of the radial rib plate (11) is positioned at the center of the furnace bottom plate (10) or is staggered or a steel bar is placed at the center, or a blast furnace shell (1) is welded on the furnace bottom plate (10) firstly, and then the radial rib plate (11) penetrates into a cutting socket (9) reserved in advance at the lower part of the blast furnace shell (1) one by one and is welded firmly;
the third rigid furnace bottom structure is that a furnace bottom plate (10) is installed on a concrete foundation (7), and strip-shaped rib plates (15) are welded on the furnace bottom plate (10) in parallel, or a blast furnace shell (1) is welded on the furnace bottom plate (10) first, and then the strip-shaped rib plates (15) are penetrated into cutting sockets (9) reserved in advance at the lower part of the blast furnace shell (1) one by one and then are welded firmly;
the fourth rigid furnace bottom structure is that a furnace bottom plate (10) is installed on a concrete foundation (7), strip-shaped rib plates (15) are welded on the furnace bottom plate (10) longitudinally and transversely to form a grid structure, the strip-shaped rib plates (15) are cut at the intersection positions and then are installed through a mutual buckling method, or a blast furnace shell (1) is welded on the furnace bottom plate (10), then the strip-shaped rib plates (15) in a certain position are penetrated and welded firmly from cutting jacks (9) reserved in advance at the lower part of the blast furnace shell one by one, and then the strip-shaped rib plates (15) in the other position are cut into small blocks according to the grid size and then are welded;
the fifth rigid furnace bottom structure is that firstly, radial rib plates (11) or the combination of the radial rib plates (11) and annular rib plates (12) or a full-strip rib plate (15) or a 'net-shaped structure' formed by combining the strip rib plates (15) are welded on a furnace bottom plate (10), then the furnace bottom plate (10) comprises the 'rib plates' and is reversed, one surface of the 'rib plate' is arranged on a concrete foundation (7) to form a pressure-resistant furnace bottom structure below the 'rib plate', and then reinforcing angles (17) are welded around a blast furnace shell (1) to enable the furnace bottom plate (10) to be firmly combined with the furnace bottom plate.
2. The blast furnace bottom pressure withstanding structure of claim 1, wherein: the radial rib plates (11), the annular rib plates (12) and the strip rib plates (15) are made of materials, are thick and wide, and are arranged according to the arrangement density of the rib plates, and the arrangement density of the rib plates is calculated and determined according to the size of a specific blast furnace, the pressure in the furnace, the area of the furnace bottom and the stress condition of the furnace bottom.
3. The blast furnace bottom pressure withstanding structure of claim 1, wherein: before pouring heat-resistant concrete, the rigid furnace bottom is provided with a grouting hole and welded with a grouting pipe, the grouting pipe is used for grouting and filling between the lower surface of the furnace bottom and a concrete foundation, the grouting pipe is cut after the grouting material is solidified, the grouting hole is sealed and welded firmly, then the heat-resistant concrete is poured and leveled according to the structural elevation, then a water-cooled pipe or an air-cooled pipe is arranged on the leveling layer, corrugated compensators are required to be arranged at two ends of each pipe so as to meet the requirements of pressure resistance, expansion and contraction and sealing, finally refractory materials with good heat conductivity are poured between the water-cooled pipe or the air-cooled pipe and around the water-cooled pipe or the air-cooled pipe, and the upper surface is leveled again according to the structural elevation so as to build the carbon brick of the furnace bottom.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811576600.7A CN109457074B (en) | 2018-12-23 | 2018-12-23 | Blast furnace bottom pressure-resistant design scheme |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811576600.7A CN109457074B (en) | 2018-12-23 | 2018-12-23 | Blast furnace bottom pressure-resistant design scheme |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109457074A CN109457074A (en) | 2019-03-12 |
| CN109457074B true CN109457074B (en) | 2020-09-11 |
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