CN112779375A - Blast furnace cooling wall - Google Patents
Blast furnace cooling wall Download PDFInfo
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- CN112779375A CN112779375A CN202011559102.9A CN202011559102A CN112779375A CN 112779375 A CN112779375 A CN 112779375A CN 202011559102 A CN202011559102 A CN 202011559102A CN 112779375 A CN112779375 A CN 112779375A
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- 238000001816 cooling Methods 0.000 title claims abstract description 120
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 159
- 239000010959 steel Substances 0.000 claims abstract description 159
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 138
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 120
- 229910052802 copper Inorganic materials 0.000 claims abstract description 120
- 239000010949 copper Substances 0.000 claims abstract description 120
- 239000002131 composite material Substances 0.000 claims abstract description 62
- 239000011819 refractory material Substances 0.000 claims description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 67
- 230000000694 effects Effects 0.000 abstract description 13
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- 229910001141 Ductile iron Inorganic materials 0.000 description 1
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B7/00—Blast furnaces
- C21B7/10—Cooling; Devices therefor
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Furnace Housings, Linings, Walls, And Ceilings (AREA)
- Blast Furnaces (AREA)
Abstract
The invention provides a blast furnace cooling wall, and belongs to the technical field of metallurgical equipment. The blast furnace cooling wall comprises a cooling wall body, the cooling wall body is a copper-steel composite plate component, one side of a copper plate of the copper-steel composite plate component is close to the inner side of the blast furnace, and one side of a steel plate of the copper-steel composite plate component is arranged on the wall of the blast furnace; the blast furnace cooling wall also comprises a water channel cover, a water channel is arranged on one side of the steel plate far away from the copper plate, and the water channel cover is a convex cover body protruding towards one side far away from the copper plate; the water channel cover is arranged at the open end of the water tank and is connected with the steel plate, and the water channel cover and the water tank are enclosed to form a water channel. The blast furnace cooling wall provided by the invention is characterized in that the water channel cover welded on the steel plate and the water channel arranged on one side of the steel plate are arranged to jointly enclose the water channel, and the water channel cover is arranged into the convex cover body, so that the water passing cross-sectional area of the water channel is increased under the condition of not excessively increasing the thicknesses of the steel plate and the copper plate, the blast furnace cooling wall achieves the preset cooling effect, the volume and the weight of the blast furnace cooling wall are reduced, and the manufacturing cost is reduced.
Description
Technical Field
The invention belongs to the technical field of metallurgical equipment, and particularly relates to a blast furnace cooling wall.
Background
In order to improve the heat transfer performance of the furnace body cooling wall in the high heat load area of the blast furnace, researchers developed copper cooling walls. The copper cooling wall has the characteristics of strong heat transfer capacity, excellent heat flow impact resistance, excellent thermal shock resistance and the like. The cooling water channel in the copper cooling wall is obtained by drilling, so that the defect of poor heat transfer performance caused by a high-heat-resistance coating and an air gap between the cooling water pipe and the wall body of the nodular cast iron cooling wall is overcome. However, during the application process, the applicant finds that the copper cooling wall is easy to generate abrasion damage and bending deformation.
So that the copper-steel cooling wall can be produced. The copper-steel cooling wall has high strength and strong bending resistance, and overcomes the defects of easy abrasion and damage and bending deformation of the copper cooling wall. In the copper-steel cooling wall, the cooling water channel is generally a round hole channel and is arranged on one side of a steel plate or a copper plate through drilling. In order to achieve a certain cooling effect, the aperture of the cooling water channel is usually large, which also results in that the thickness of the steel plate or the copper plate must be large enough, which results in that the copper-steel cooling wall is heavy and heavy as a whole and has high manufacturing cost.
Disclosure of Invention
The invention aims to provide a blast furnace cooling wall, and aims to solve the technical problems that the whole cooling wall is heavy and the manufacturing cost is high in order to achieve the cooling effect of the conventional blast furnace cooling wall.
In order to achieve the purpose, the invention adopts the technical scheme that: the cooling wall body is a copper-steel composite plate component, one side of a copper plate of the copper-steel composite plate component is close to the inner side of the blast furnace, and one side of a steel plate of the copper-steel composite plate component is installed on the wall of the blast furnace;
the blast furnace cooling wall also comprises a water channel cover, a water tank is arranged on one side of the steel plate, which is far away from the copper plate, and the water channel cover is a convex cover body which is convex towards one side, which is far away from the copper plate; the water channel cover is arranged at the opening end of the water channel and is hermetically connected with the steel plate, the water channel cover and the water channel are enclosed to form a water channel,
the blast furnace cooling wall also comprises a water pipe for communicating an external cooler with the water channel, and the water pipe is connected with the water channel cover.
Further, the water tank extends to the copper plate in a depth direction to enhance a cooling effect of the copper plate.
Furthermore, the water tank is of a rectangular tank body structure, and the water channel cover is a convex arc cover body which is convex towards one side far away from the copper plate.
Further, the water channel cover is a semicircular pipe type cover body, and the diameter of the water channel cover is equal to the width of the water tank.
Further, the blast furnace cooling wall further comprises a sleeve assembly, the sleeve assembly comprises an inner side sleeve sleeved on the outer side of the water pipe and an outer side sleeve sleeved on the outer side of the inner side sleeve, and the inner side sleeve and the outer side sleeve are respectively connected with the water channel cover.
Further, a gap is formed between the inner sleeve and the water pipe, and a gap is formed between the outer sleeve and the inner sleeve.
Furthermore, one side of the copper plate, which is far away from the steel plate, is provided with a groove, a fireproof material is arranged in the groove, and the distance between the groove bottom of the groove and the groove bottom of the water groove is greater than 20 mm.
Furthermore, one side of the copper plate, which is far away from the steel plate, is provided with a plurality of first reinforcing ribs, and each first reinforcing rib is connected to the edge of the steel plate in a closed structure in an end-to-end connection manner.
Furthermore, one side of the copper plate, which is far away from the steel plate, is provided with a plurality of second reinforcing ribs, the second reinforcing ribs are positioned inside the closed structure and are perpendicular to the extending direction of each water channel, and the second reinforcing ribs are connected with the first reinforcing ribs.
Furthermore, the second reinforcing rib is provided with a gap matched with the water tank cover, and the second reinforcing rib is also connected with the water tank cover.
The blast furnace cooling wall provided by the invention has the beneficial effects that the water channel cover welded on the steel plate and the water channel arranged on one side of the steel plate are arranged to jointly enclose to form the water channel, and the water channel cover is arranged into the convex cover body, so that the water passing sectional area of the water channel is increased under the condition of not excessively increasing the thicknesses of the steel plate and the copper plate, the blast furnace cooling wall achieves the preset cooling effect, the volume and the weight of the blast furnace cooling wall are reduced, and the manufacturing cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a schematic flow chart of a method for manufacturing a stave cooler for a blast furnace according to an embodiment of the present invention;
FIG. 2 is a schematic view showing the arrangement of copper plates and steel plates before explosion welding in a method of manufacturing a stave cooler according to an embodiment of the present invention;
FIG. 3 is a schematic view of a cooling stave for a blast furnace according to an embodiment of the present invention;
fig. 4 is a sectional view at a in fig. 3.
In the figure: 1. a steel plate; 2. a copper plate; 3. a water passage cover; 4. a water pipe; 5. an outer casing; 6. an inner casing; 7. a first reinforcing rib; 8. a second reinforcing rib; 9. grooving; 10. a butter buffer layer; 11. a explosive layer; 12. a spacer bracket; 13. and (5) foundation construction.
Detailed Description
In order to make the technical problems, technical solutions and advantageous effects to be solved by the present invention more clearly apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 3 to 4, a blast furnace stave according to the present invention will now be described. The blast furnace cooling wall comprises a cooling wall body, wherein the cooling wall body is a copper-steel composite plate component. One side of the copper plate 2 of the copper-steel composite plate component is close to the inner side of the blast furnace, and one side of the steel plate 1 of the copper-steel composite plate component is arranged on the wall of the blast furnace.
The blast furnace cooling wall also comprises a water channel cover 3 and a water pipe 4, one side of the steel plate 1, which is far away from the copper plate 2, is provided with a water channel, the water channel cover 3 is covered on the open end of the water channel and is hermetically connected with the steel plate 1, and the water channel cover 3 and the water channel are enclosed to form a water channel. The water channel cover 3 is a convex cover body protruding towards one side far away from the copper plate 2, and can be a convex arc-shaped cover body or a convex square-shaped cover body, so as to increase the cross-sectional area of the water channel, that is, the cooling water in the water channel can be positioned in the water channel or in the area enclosed by the water channel cover 3. The water pipe 4 is used for communicating the external cooler with the water channel, and the water pipe is connected with the water channel cover 3.
Therefore, the water channel formed by the water channel cover 3 and the water channel in a surrounding mode can increase the water passing sectional area of the water channel under the condition that the thickness of the steel plate 1 is not excessively increased, so that the thickness of the steel plate 1 is reduced, the size and the weight of the whole copper-steel composite plate are reduced, and the manufacturing cost is reduced.
Compared with the prior art, the blast furnace cooling wall provided by the embodiment of the invention has the advantages that the water channel cover welded on the steel plate and the water channel arranged on one side of the steel plate are arranged to jointly enclose the water channel, and the water channel cover is arranged into the convex cover body, so that the water channel cross-sectional area is increased under the condition of not excessively increasing the thicknesses of the steel plate and the copper plate, the blast furnace cooling wall achieves the preset cooling effect, the volume and the weight of the blast furnace cooling wall are reduced, and the manufacturing cost is reduced.
Referring to fig. 3 to 4, as an embodiment of the cooling stave of the blast furnace of the present invention, the water tank extends to the copper plate 2 along a depth direction to enhance a cooling effect of the copper plate 2.
As a specific example of the blast furnace stave provided by the present invention, the depth of the water tank extending to the copper plate 2 is in the range of 5mm to 15 mm. The basin stretches into copper 2 one side and helps the heat transfer of water course and copper 2, but the basin should not stretch into copper 2 one side too deeply to avoid transition to detract from the intensity of copper 2.
Referring to fig. 3 to 4, in an embodiment of the cooling stave of the blast furnace according to the present invention, the water tank has a rectangular tank structure, and the water channel cover 3 is a convex arc-shaped cover body protruding toward a side away from the copper plate 2.
Referring to fig. 3 to 4, as an embodiment of the cooling wall of the blast furnace provided by the present invention, the water channel cover 3 is a semicircular pipe type cover body, and the diameter of the water channel cover 3 is equal to the width of the water tank. The groove is a rectangular groove, so that the groove bottom is flat, the water passing cross section area is increased as much as possible (compared with the grooves with other shapes) under the condition that the water groove is not deep into the copper plate 2, and meanwhile, the semicircular pipe type water channel cover 3 encloses to form a larger water passing cross section area under the condition that the material of the water channel cover 3 is saved.
Referring to fig. 3 to 4, as an embodiment of the blast furnace stave provided by the present invention, the blast furnace stave further comprises a sleeve assembly, the sleeve assembly comprises an inner sleeve 6 sleeved outside the water pipe 4 and an outer sleeve 5 sleeved outside the inner sleeve 6, and the inner sleeve 6 and the outer sleeve 5 are respectively connected to the waterway cover 3.
As the blast furnace cooling wall is finally installed on the blast furnace, the water pipe 4 needs to pass through a through hole on the blast furnace wall to be communicated with an external cooler, the temperature of the blast furnace wall is extremely high, the water pipe 4 is in direct contact with the blast furnace wall, the water pipe 4 and the joint of the water pipe 4 and the water channel cover 3 are likely to be damaged at high temperature, and a sleeve pipe assembly is additionally arranged outside the water pipe 4 to avoid the direct contact of the water pipe 4 and the blast furnace wall. Meanwhile, the sleeve assembly can avoid cracking and water leakage caused by the influence of thermal shock on the cooling wall in the working process.
As a specific embodiment of the blast furnace cooling wall provided by the invention, a gap is formed between the inner sleeve 6 and the water pipe 4, a gap is formed between the outer sleeve 5 and the inner sleeve 6, a gap is formed between the inner sleeve 6 and the water pipe 4, and a gap is formed between the outer sleeve 5 and the inner sleeve 6, so that the water pipe 4 can better isolate the extrusion pressure and high temperature of the blast furnace wall to the water pipe 4.
Referring to fig. 3, as an embodiment of the cooling stave of the blast furnace provided by the present invention, a slot 9 is provided on a side of the copper plate 2 away from the steel plate 1, a refractory material is installed in the slot 9, and a distance between a bottom of the slot 9 and a bottom of the water tank is greater than 20 mm. The refractory material can effectively reduce the high-temperature damage of the cooling wall of the blast furnace, and the interval between the bottom of the open groove 9 and the bottom of the water groove is more than 20mm so as to avoid the strength of the copper plate 2 from being reduced by transition.
As a specific example of the blast furnace stave provided by the present invention, the refractory material is a refractory brick or a refractory paint coated in the slot 9.
Referring to fig. 3, as an embodiment of the cooling stave of the blast furnace provided by the present invention, a plurality of first reinforcing ribs 7 are provided on a side of the copper plate 2 away from the steel plate 1, and each of the first reinforcing ribs 7 is connected to an edge of the steel plate 1 in an end-to-end closed structure.
Referring to fig. 3, as an embodiment of the cooling stave of the blast furnace provided by the present invention, a plurality of second reinforcing ribs 8 are disposed on a side of the copper plate 2 away from the steel plate 1, and the second reinforcing ribs 8 are disposed inside the closed structure and perpendicular to the extending direction of each water channel. The second reinforcing bead 8 is connected to the first reinforcing bead 7. The first reinforcing ribs 7 and the second reinforcing ribs 8 can effectively enhance the strength and rigidity of the blast furnace cooling wall.
Referring to fig. 3, as an embodiment of the cooling stave of the blast furnace provided by the present invention, the second reinforcing rib 8 is provided with a notch adapted to the water tank cover 3, and the second reinforcing rib 8 is further connected to the water tank cover 3 to further enhance the rigidity of the cooling stave body.
Referring to fig. 1 to 4, the present invention further provides a method for manufacturing a cooling wall of a blast furnace, which corresponds to the above-mentioned cooling wall of a blast furnace. The method for manufacturing a blast furnace stave according to the present invention will now be described. Fig. 1 shows a flow of implementing a method for manufacturing a blast furnace stave according to an embodiment of the present invention, which is detailed as follows:
in step S100, an operation of manufacturing a copper-steel composite plate is performed, which mainly includes obtaining a steel plate 1 and a copper plate 2, and connecting the steel plate 1 and the copper plate 2 to obtain the copper-steel composite plate.
In step S200, a waterway manufacturing operation is performed. S200, the water channel manufacturing method specifically comprises the following steps:
s210, a water tank is arranged on one side of the steel plate 1 of the copper-steel composite plate. One side of the steel plate 1 is the cold side of the blast furnace cooling wall, and one side of the copper plate 2 is the hot side of the blast furnace cooling wall.
S220, a water channel cover 3 is obtained, where the water channel cover 3 is a convex cover body protruding toward a side away from the copper plate 2, and may be a convex arc cover body or a convex square cover body, so as to increase a water passing area.
S230, the water channel cover 3 is welded with the steel plate 1, so that the water channel is enclosed by the water tank and the water channel cover 3 to form a water channel.
The water channel formed by enclosing in this way can increase the cross-sectional area of the water channel without excessively increasing the thickness of the steel plate 1, thereby reducing the thickness of the steel plate 1, further reducing the volume and weight of the whole copper-steel composite plate and reducing the manufacturing cost.
In step S300, the water pipe 4 is welded. In step S300, after the water pipe 4 is welded, the water pipe 4 is connected to the water channel, and the water pipe 4 is used to connect an external cooler to the water channel, so that the coolant in the cooler can be supplied to the water channel through the water pipe 4.
In step S800, a water pressure test operation is performed: and (4) injecting water into the prepared water channel (after the water pipe 4 is welded) and maintaining pressure to test the tightness of the water channel. And if the tightness of the water channel does not meet the tightness, judging that the water channel is unqualified and needing to be repaired or scrapped.
As can be seen from the foregoing embodiments, in the method for manufacturing a cooling stave of a blast furnace according to an embodiment of the present invention, a water passage is formed by enclosing a water passage cover welded to a steel plate and a water passage opened at one side of the steel plate, and the water passage cover is configured as a convex cover body, so that the water passage cross-sectional area of the water passage is increased without excessively increasing the thicknesses of the steel plate and the copper plate, so that the cooling stave of the blast furnace achieves a predetermined cooling effect, the volume and the weight of the cooling stave of the blast furnace are reduced, and the manufacturing cost is reduced.
As a specific embodiment of the manufacturing method of the blast furnace cooling stave provided by the invention, the step S100 of manufacturing the copper-steel composite plate specifically comprises the steps of S110 obtaining a copper plate 2 and a steel plate 1; and S120, manufacturing and obtaining the copper-steel composite plate by using the copper plate 2 as a base plate and the steel plate 1 as a composite plate through an explosive welding mode. The welded connection of copper 2 and steel sheet 1 can be realized to explosive welding, and the copper steel composite sheet mechanical properties after the explosive welding is better, and explosive welding's welding process is fast moreover, efficient, can make copper steel composite sheet with copper 2 and steel sheet 1 fast. The explosion welding can be metal welding compounding which can rapidly realize the great difference of two or more materials, is hardly limited by performance parameters such as melting point, strength, thermal expansion coefficient and the like of the materials, has very short action time and rapid temperature change of the materials in the explosion welding process, and does not generate interface reaction. One side of the steel plate 1 is the cold side of the blast furnace cooling wall, and one side of the copper plate 2 is the hot side of the blast furnace cooling wall.
Referring to fig. 3 to 4, as an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S210 of forming a water groove on one side of a steel plate 1 of a copper-steel composite plate specifically includes:
s211, milling a water tank on one side of a steel plate 1 of the copper-steel composite plate, wherein the water tank is of a rectangular groove structure with an opening at the upper end, and the lower end of the water tank extends downwards to the copper plate 2 (layer), so that cooling liquid in the water tank can directly exchange heat with the copper plate 2 for cooling, and the cooling effect of a cooling wall of the blast furnace is improved; certainly, the lower end of the water tank cannot penetrate into one side of the copper plate 2 too deeply, otherwise, the wall of the water channel is easy to crack due to the overhigh temperature of the copper plate 2. Moreover, the lower end of the water tank cannot penetrate into one side of the copper plate 2 too deeply, and the copper plate 2 cannot be guaranteed to have certain strength.
S212, polishing the inner wall of the water tank, wherein the roughness of the inner wall surface of the water tank is less than Ra6.3, so that the resistance of the cooling liquid in the water channel is reduced.
As an embodiment of the method for manufacturing the blast furnace stave according to the present invention, when milling the water channel on the steel plate 1 side of the copper-steel composite plate in step S211, a conventional milling cutter is used to open the groove on the steel plate 1 at a low speed until reaching the interface of the copper-steel composite layer. And after entering the copper layer, replacing a fly cutter or an alloy cutter to keep high-speed grooving, wherein the grooving width is kept smaller than the grooving width of the steel plate, namely, a space for rounding off is reserved.
Referring to fig. 3 to 4, as an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S220 obtains the water passage cover 3, where the water passage cover 3 is a convex cover body protruding toward a side away from the copper plate 2, and specifically includes: a semicircular pipe type waterway cover 3 is obtained, and the diameter of the waterway cover 3 is equal to the width of the water tank (the extending direction and the depth direction of the non-water tank). The water channel is a rectangular groove, so that the bottom of the water channel is flat, the water cross-sectional area of the water channel is increased as much as possible (compared with the grooves with other shapes) under the condition that the water channel is not deep into the copper plate 2, and meanwhile, the semicircular pipe type water channel cover 3 encloses and forms a larger water cross-sectional area under the condition that the material of the water channel cover 3 is saved.
Step S230 is to weld the water channel cover 3 to the steel plate 1, so that the water channel and the water channel cover enclose to form a water channel specifically includes: the water channel cover 3 is covered above the water channel (on one side of the opening), and the water channel cover 3 is connected with the steel plate 1 in a sealing welding mode, so that the water channel and the water channel cover 3 are enclosed to form a water channel. It should be understood that the two ends of the waterway cover 3 are necessarily provided with blocking structures or are welded and blocked with some structures on the copper-steel composite plate, so that the waterway is relatively closed and does not leak the cooling liquid.
As an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S221 of obtaining the semicircular pipe type waterway cover 3 specifically includes:
obtaining a circular tube;
the circular tube is cut in the axial direction thereof to obtain two semicircular tube-shaped waterway covers 3.
The semicircular pipe type waterway cover 3 can be obtained by cutting a standard circular pipe so as to reduce the manufacturing cost of the waterway cover 3.
In an embodiment of the method for manufacturing the cooling stave of the blast furnace of the present invention, the material of the waterway cover 3 is the same as that of the steel plate 1, so as to facilitate welding.
As an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S221 of obtaining the semicircular pipe type water passage cover further includes:
the two ends of the water channel cover 3 in the axial direction are respectively provided with a communicating port so as to facilitate the conduction of the water channel and the water pipe 4, and the connecting port is positioned on the arc-shaped outer wall of the water channel cover 3. The water pipe 4 is connected with the water channel cover 3 in a welding mode, and the communication opening is communicated with the water pipe 4. The step of opening the communication port may be located after the circular tube is cut or before the circular tube is cut.
In an embodiment of the method for manufacturing the cooling stave of the blast furnace of the present invention, the water pipe 4 and the water passage cover 3 are made of the same material for welding.
As an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S221 of obtaining the semicircular pipe type water passage cover further includes:
the inner wall of the waterway cover 3 is polished to have a surface roughness of Ra6.3 or less of the inner wall of the waterway cover 3, to reduce the resistance of the coolant in the waterway. This step should be performed after the step of opening the communication port.
Referring to fig. 3 to 4, as an embodiment of the method for manufacturing a blast furnace stave according to the present invention, the method for manufacturing a blast furnace stave according to the present invention further includes a step S400 of welding the sleeve assembly, wherein the step S400 of welding the sleeve assembly is performed after the step S300 of welding the water pipe, although the step S400 of welding the sleeve assembly may be performed before or after the step 700 of hydraulic pressure test, and these two steps do not affect each other, and generally, the step S400 of welding the sleeve assembly is performed immediately after the step S300 of welding the water pipe. Step S400 of welding the sleeve assembly specifically includes the following operations:
s410, obtaining an outer-layer sleeve 5 and an inner-layer sleeve 6;
s420, the outer-layer sleeve 5 and the inner-layer sleeve 6 are connected with the water channel cover 3 in a welded mode respectively, the inner-layer sleeve 6 is wrapped on the outer side of the water pipe 4, the outer-layer sleeve 5 is wrapped on the outer side of the inner-layer water pipe 6, a gap is formed between the inner-layer sleeve 6 and the water pipe 4, and a gap is formed between the outer-layer sleeve 5 and the inner-layer sleeve 6.
Because the blast furnace stave is installed on the blast furnace at last, water pipe 4 need pass the perforation on the blast furnace wall and come to communicate with the cooler of peripheral hardware, blast furnace wall temperature is high, water pipe 4 is in blast furnace wall direct contact, probably can make water pipe 4 and the junction high temperature damage of water course lid 3, consequently increase the thimble subassembly in the water pipe 4 outside, with avoid water pipe 4 and blast furnace wall direct contact, the clearance has between inlayer sleeve 6 and the water pipe 4 simultaneously, the clearance has between skin sleeve 5 and the inlayer sleeve 6, can make the high temperature of water pipe 4 isolated blast furnace wall better. Meanwhile, the sleeve assembly can avoid cracking and water leakage caused by the influence of thermal shock on the cooling wall in the working process.
As a specific example of the method for manufacturing the blast furnace stave according to the present invention, the depth of the water tank extending to the copper plate 2 is 5mm to 15 mm. The basin stretches into copper 2 one side and helps the heat transfer of water course and copper 2, but the basin should not stretch into copper 2 one side too deeply to avoid transition to detract from the intensity of copper 2.
Referring to fig. 3 to 4, as an embodiment of the method for manufacturing a cooling stave of a blast furnace provided by the present invention, the method for manufacturing a cooling stave of a blast furnace further comprises a step S1000 of milling the slot 9 and installing a refractory material. The step S1000 of milling the groove and installing the refractory material specifically comprises the following steps:
milling a slot 9 on one side of the copper plate 2 far away from the steel plate 1, wherein the interval between the bottom of the slot 9 and the bottom of the water tank is more than 20 mm;
a refractory material is obtained and installed in the slot 9.
The refractory material can effectively reduce the high-temperature damage of the cooling wall of the blast furnace, and the interval between the bottom of the open groove 9 and the bottom of the water groove is more than 20mm so as to avoid the strength of the copper plate 2 from being reduced by transition.
As a specific example of the method for manufacturing the blast furnace stave according to the present invention, the refractory material is a refractory brick or a refractory paint coated in the slot 9.
Referring to fig. 3, as an embodiment of the method for manufacturing the cooling stave of the blast furnace provided by the present invention, the water passage has a plurality of parallel water passages arranged at intervals, and the extending direction of the water passage is perpendicular to the extending direction of the slot 9.
Referring to fig. 3, as an embodiment of the method for manufacturing a cooling stave of a blast furnace provided in the present invention, the method for manufacturing a cooling stave of a blast furnace further includes a step S900 of welding a reinforcing rib, and the step S900 of welding the reinforcing rib includes:
obtaining a plurality of first reinforcing ribs 7, welding each first reinforcing rib 7 on one side surface of the steel plate 1 far away from the copper plate 2, and connecting each first reinforcing rib 7 to the edge of the steel plate 1 in a closed structure in a tail-ending connection manner;
and obtaining a plurality of second reinforcing ribs 8, welding each second reinforcing rib 8 on one side surface of the steel plate 1 far away from the copper plate 2 in parallel and at intervals, wherein each second reinforcing rib 8 is positioned in the closed structure and is perpendicular to the extending direction of each water channel.
The first reinforcing ribs 7 and the second reinforcing ribs 8 can effectively enhance the strength and rigidity of the blast furnace cooling wall.
As a specific embodiment of the manufacturing method of the blast furnace stave provided by the present invention, the second reinforcing rib 8 is provided with a notch adapted to the water channel cover 3, and the second reinforcing rib 8 is further connected to the water channel cover 3 by welding, so as to enhance the connection rigidity of the whole blast furnace stave.
As a specific example of the method for manufacturing the blast furnace stave according to the present invention, an arc transition structure is provided between the vertical wall of the water tank and the surface of the steel plate 1, and an arc transition structure is provided between the vertical wall of the water tank and the bottom of the water tank. The optimized design of the circular arc transition structure can reduce the cooling dead zone and enhance the heat transfer effect.
As a specific example of the manufacturing method of the cooling wall of the blast furnace provided by the present invention, step S800 is a hydraulic pressure test: carry out water injection and pressurize to the water course to the leakproofness of test water course specifically includes:
s810, sealing one end of the water channel;
s820, injecting water from the other end of the water channel to enable the water pressure in the water channel to reach 2.0 Mpa;
s830, closing the water injection end of the water channel and keeping the water channel in a closed state for 3 hours;
s840, if the water pressure of the water channel can be kept above 1.9Mpa within 3 hours of the water channel being kept in a closed state, judging that the water channel is qualified in sealing property; otherwise, judging that the water channel sealing performance is unqualified, and repairing or scrapping the cooling wall of the blast furnace.
As a specific embodiment of the method for manufacturing a cooling wall of a blast furnace provided by the present invention, the method for manufacturing a cooling wall of a blast furnace further includes a step S500 of annealing, and the step S500 of annealing is performed immediately after the sleeve assembly is welded in the step S400. The annealing treatment in step S500 specifically includes:
and annealing the copper-steel composite plate, wherein the annealing temperature is controlled to be 400-600 ℃, and the annealing time is controlled to be 8.5-11 h.
Since the welding operation in the steps of manufacturing the water channel in the step S300 and welding the sleeve assembly in the step S400 may generate a large stress on the cooling wall of the blast furnace, the annealing process in the step S500 is performed to help the cooling wall of the blast furnace to release the stress rapidly.
As an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the method for manufacturing a cooling stave of a blast furnace according to the present embodiment further includes the step S600 of leveling the chute cover 3, and the step S600 of leveling the chute cover 3 specifically includes: the height of the waterway cover 3 at the side far from the steel plate 1 is leveled.
As a specific embodiment of the manufacturing method of the blast furnace cooling wall provided by the invention, the copper plate 2 is a TU1 oxygen-free copper plate, in order to ensure the rigidity of the cooling wall and meet the requirement that the cooling wall still does not deform or damage under the conditions of high temperature and large pressure, the steel plate 1 is a Q345R low-alloy high-strength steel plate, and the thickness value range of the copper plate 2 is 50-70 mm; the thickness of the steel plate 1 ranges from 20mm to 30 mm. The copper-steel composite plate with good mechanical property can be obtained by explosion welding of the TU1 oxygen-free copper plate and the Q345R low-alloy high-strength steel plate, the TU1 oxygen-free copper plate is low in impurity element content and excellent in heat conduction property, the heat efficiency can be enhanced, and hydrogen embrittlement and the like caused by overhigh temperature in the blast furnace can be avoided. Meanwhile, the thickness range of the TU1 oxygen-free copper plate is 50-70 mm through measurement and calculation, and the thickness range of the Q345R low-alloy high-strength steel plate is 20-30mm, so that the heat dissipation and strength performance of the cooling wall of the blast furnace can be met.
Referring to fig. 2, as an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S120 of manufacturing and obtaining a copper-steel composite plate by explosion welding using a copper plate 2 as a substrate and a steel plate 1 as a composite plate specifically includes:
s121, the welded surface of the copper plate 2 is placed on an explosive foundation in a flat mode, and the explosive foundation is preferably a flat foundation 13.
S122, the welded surface of the steel plate 1 faces downward and is parallel to the copper plate 2 at a distance, so that a gap is formed between the steel plate 1 and the copper plate 2. In the present embodiment, the steel plates 1 and the copper plates 2 are not disposed at a regular inclination, but the steel plates 1 and the copper plates 2 are disposed in parallel, so that the connection performance of the steel plates 1 and the copper plates 2 welded in a wide range can be kept consistent everywhere after welding.
S123 the butter buffer layer 10 and the explosive layer 11 are laid in sequence in the region to be exploded on the upper surface of the steel plate 1 respectively, the butter buffer layer 10 is tightly attached to the upper surface of the steel plate 1, the explosive layer 11 is located on the upper portion of the butter buffer layer 10, and the butter buffer layer 10 can prevent the explosive force and the thermal reaction of the explosive layer 11 from damaging the upper surface of the steel plate 1.
And S124, arranging detonators on the upper part of the explosive layer 1.
S125, detonating the detonator, and connecting the copper plate 1 and the steel plate 2 by using the reaction and acting force of explosive welding to obtain the copper-steel composite plate. After the explosive is detonated, chemical energy instantaneously released can generate certain high pressure (up to 700MPa) and high temperature (locally up to 3000 ℃), impact force generated by energy waves enables the composite plate to fly downwards and violently collide with the substrate, and a contact interface generates jet flow at a collision point. The jet flow generates scouring action on the surface of the plate, and can remove an oxide film, impurities and the like on the surface, so that the clean surface forms metal bond combination. And (3) continuously moving the bonding transition layer forwards along with the continuous consumption of the explosive to form a continuous bonding transition layer so as to finish the compounding.
Referring to fig. 2, as an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the step S122 of disposing the steel plate 1 with the welded surface facing downward and in parallel with the copper plate 2 at an interval specifically includes:
acquiring four spacing brackets 12;
placing four spacing brackets 12 at the four corners of the copper plate 2;
the welded surface of the steel plate 1 faces downwards and is arranged in parallel with the copper plate 2 at intervals by means of the interval supports 12, the copper plate 2 and the steel plate 1 are rectangular plate bodies, the four interval supports 12 with the same size are placed at four corners of the copper plate 2, and the four corners are also places where the copper plate 2 cannot be subjected to explosive welding with the steel plate 1. The steel plate 1 is placed on the spacer bracket 12 to achieve a parallel spaced arrangement of the copper plate 2 and the steel plate 1. The explosive layer 11 is not coated on the steel plate 1 at the positions (four corners) corresponding to the spacing brackets 12, and the grease cushioning layer 10 and the explosive layer 11 are coated on the middle position of the steel plate 1.
Referring to fig. 2, as an embodiment of the method for manufacturing a cooling stave of a blast furnace according to the present invention, the spacer 12 has a "W" bent plate structure. The W-shaped bent plate structure is a bent structure formed by bending or stamping a plate, and the upper part and the lower part of the W-shaped bent plate structure are ground into planes. Since the interval between the copper plate 2 and the steel plate 1 may be in the order of millimeters, a large support block cannot satisfy the interval in the order of millimeters, and may not be strong enough to support the steel plate 1 without bending.
According to the specific embodiment of the method for manufacturing the blast furnace cooling stave provided by the invention, according to the measurement and calculation, the interval h between the copper plate 2 and the steel plate 1 is in the range of 3mm-7mm in order to obtain better explosive welding effect.
As a specific example of the method for manufacturing the blast furnace stave according to the present invention, the butter cushioning layer 10 has a thickness in the range of 0.5mm to 1.5mm in order to obtain a better explosion welding effect according to measurement.
As a specific example of the method for manufacturing a blast furnace stave according to the present invention, it is considered that the composition of the explosive layer 11 is a powdery emulsion explosive and the charge amount of the explosive layer 11 is 2.0g cm from the viewpoint of measurement and calculation, for obtaining a better explosive welding effect-2-3.0g·cm-2The explosive layer 11 has a charge density of 0.8g cm-3-1.2g·cm-3。
As a specific embodiment of the method for manufacturing the blast furnace cooling stave provided by the invention, because the detonation velocity of the explosive is usually high, a density regulator is required to be added to control the velocity of the explosive, and in the embodiment, the detonation velocity is controlled by adding a certain amount of sodium chloride on the basis of the powdery emulsion explosive. Drying and sieving the emulsion explosive, adding 10-30% (mass ratio) of sodium chloride, fully mixing, and uniformly stirring to obtain the more optimized components of the explosive layer 11.
In a specific embodiment of the method for manufacturing a cooling wall of a blast furnace according to the present invention, in step S123, when the butter cushioning layer 10 and the explosive layer 11 are sequentially laid in the explosive layer 11 and the butter cushioning layer 10 on the upper surface of the steel plate 1, respectively, the prepared explosive is placed on the butter cushioning layer 10, and is leveled by a wooden stick, so as to ensure the consistent thickness of the explosive as much as possible, and the explosive is fixed by a chemical frame made of kraft paper, thereby playing a role in restraining the explosive.
As a specific embodiment of the method for manufacturing a blast furnace stave provided in the present invention, the step S125 detonates the detonator, and the copper plate 2 and the steel plate 1 are explosion-welded to obtain a copper-steel composite plate, including:
detonating a detonator, and welding the copper plate 2 and the steel plate 1 by explosion to obtain a first-grade copper-steel composite plate; it should be noted that, since the corners (for example, the spacing brackets 12) of the first-stage copper-steel composite plate after explosion welding are not welded, the first-stage copper-steel composite plate cannot be directly used for the step S200 to manufacture the water channel;
cutting one-level copper steel composite board, obtaining the copper steel composite board of predetermineeing the size, the cutting here except cutting the corner, it is great that one-level copper steel composite board size still can be, and the composite board size that explosive welding once obtained is greater than a copper steel composite board size, can obtain polylith copper steel composite board after the cutting.
As a specific embodiment of the method for manufacturing a cooling stave of a blast furnace provided by the present invention, the method for manufacturing a cooling stave of a blast furnace provided by the embodiment of the present invention further includes step S700 of performing a nondestructive inspection on the (welded) copper-steel composite plate. Step S700 of performing nondestructive inspection on the (welded) copper-steel composite plate is performed after leveling the water channel cover and before the water pressure test of step S800.
Step S700, the nondestructive inspection of the copper-steel composite plate specifically comprises the following steps:
s710 obtains the comparative sample and the attenuation coefficient of the comparative sample, where the attenuation coefficient of the comparative sample is also obtained through data analysis of nondestructive inspection, and the obtaining of the attenuation coefficient of the comparative sample belongs to the prior art and is not described herein again.
S720, carrying out ultrasonic detection on the copper-steel composite plate and obtaining the attenuation coefficient of the copper-steel composite plate.
S730, scanning and detecting the flaw of one side of the copper plate 2 of the copper-steel composite plate to obtain the defect condition of scanning and detecting the flaw.
S740, comparing the attenuation coefficient of the comparative sample with the attenuation coefficient of the copper-steel composite plate, and if the attenuation coefficient of the copper-steel composite plate and the attenuation coefficient of the comparative sample are out of the range of 0.9-1.1, judging that the copper-steel composite plate is unqualified; and if the defect condition of scanning flaw detection does not meet the expected condition, judging that the copper-steel composite plate is unqualified, and repairing or scrapping the unqualified copper-steel composite plate. And the qualification of the copper-steel composite plate can be judged only if the attenuation coefficient of the copper-steel composite plate and the attenuation coefficient of the comparative sample are within the range of 0.9-1.1 and the defect condition of scanning flaw detection is in accordance with the expected condition. And if the copper-steel composite plate is unqualified, repairing the copper-steel composite plate until the copper-steel composite plate is qualified.
As a specific example of the method for manufacturing the blast furnace stave according to the present invention, a copper plate having the same thickness as that of the copper-steel composite plate is used as a comparative example.
As a specific example of the method for manufacturing the cooling stave of the blast furnace according to the present invention, the flaw detector of the present example uses an A-type display pulse reflectometry flaw detector having an operating frequency of at least 2.5 to 5MHz and a longitudinal wave straight probe in a range of 8 to 20 mm.
As a specific embodiment of the manufacturing method of the blast furnace cooling wall provided by the invention, the defect conditions comprise: the projected area between the water troughs (projected area of the area between the water troughs projected to the hot surface side of the copper plate) or the projected area between the water troughs and the edge of the copper plate 2 per m2The number of point-like defects smaller than 8mm in the workpiece body and the copper plate 2 areAnd whether defects such as inclusion, interlayer, porosity, cracks and the like exist. The expected situation is every m in the projected area between the water troughs or between the water trough and the edge of the copper slab 22The number of the point defects smaller than 8mm in the workpiece solid is less than or equal to 8, and the copper plate 2 has no defects such as inclusion, interlayer, looseness, cracks and the like. The condition that the scanning flaw detection defect conditions meet the expected conditions refers to that every m in the projection area between the water tanks or the projection area between the water tanks and the edge of the copper plate 22The number of the point defects smaller than 8mm in the workpiece solid is less than or equal to 8, and the copper plate 2 has no defects such as inclusion, interlayer, looseness, cracks and the like. The condition that the scanning flaw detection is not expected is that the projection area between the water tanks or the projection area between the water tank and the edge of the copper plate 2 is every m2The number of the point defects smaller than 8mm in the workpiece solid is larger than 8, or the copper plate 2 has defects of inclusion, interlayer, looseness, cracks and the like.
As a specific embodiment of the method for manufacturing a cooling stave of a blast furnace provided by the present invention, the method for manufacturing a cooling stave of a blast furnace provided by the embodiment of the present invention sequentially comprises the following steps:
s100, manufacturing a copper-steel composite plate;
s200, manufacturing a water channel;
s300, welding a water pipe;
s400, welding a sleeve assembly;
s500, annealing treatment;
s600 leveling the water channel cover;
s700, carrying out nondestructive inspection on the copper-steel composite plate;
s800, testing water pressure;
s900, welding reinforcing ribs;
s1000, milling and grooving and installing refractory materials.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. The blast furnace cooling wall comprises a cooling wall body and is characterized in that the cooling wall body is a copper-steel composite plate component, one side of a copper plate of the copper-steel composite plate component is close to the inner side of a blast furnace, and one side of a steel plate of the copper-steel composite plate component is arranged on the wall of the blast furnace;
the blast furnace cooling wall also comprises a water channel cover, a water tank is arranged on one side of the steel plate, which is far away from the copper plate, and the water channel cover is a convex cover body which is convex towards one side, which is far away from the copper plate; the water channel cover is arranged at the opening end of the water channel and is hermetically connected with the steel plate, the water channel cover and the water channel are enclosed to form a water channel,
the blast furnace cooling wall also comprises a water pipe for communicating an external cooler with the water channel, and the water pipe is connected with the water channel cover.
2. The blast furnace stave of claim 1 wherein the water trough extends depthwise to the copper plate to enhance cooling of the copper plate.
3. The blast furnace stave of claim 2 wherein the water tank has a rectangular tank structure and the water passage cover is a convex arc-shaped cover projecting toward a side away from the copper plate.
4. The blast furnace stave of claim 3 wherein the water channel cover is a semi-circular pipe type cover having a diameter equal to a width of the water tank.
5. The blast furnace stave of any one of claims 1 to 4 further comprising a sleeve assembly comprising an inner sleeve disposed outside the water pipe and an outer sleeve disposed outside the inner sleeve, the inner sleeve and the outer sleeve being connected to the waterway cover, respectively.
6. The blast furnace stave of claim 5 wherein the inner sleeve has a gap with the water pipe and the outer sleeve has a gap with the inner sleeve.
7. The blast furnace stave of any one of claims 1 to 4 wherein the copper plate is provided with a slot on a side thereof remote from the steel plate, the slot having a refractory material disposed therein, the slot having a bottom spaced from the bottom of the water bath by more than 20 mm.
8. The blast furnace stave according to any one of claims 1 to 4 wherein the side of the copper plate remote from the steel plate is provided with a plurality of first ribs, each of the first ribs being connected to the edge of the steel plate in an end-to-end closed configuration.
9. The blast furnace stave according to claim 8 wherein the copper plate on a side thereof remote from the steel plate is provided with a plurality of second ribs, the second ribs being positioned within the closed structure and being arranged perpendicular to the direction of extension of the water passages, the second ribs being connected to the first ribs.
10. The blast furnace stave of claim 9 wherein the second ribs have notches adapted to the trough cover, the second ribs further connected to the trough cover.
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| CN202011559102.9A CN112779375A (en) | 2020-12-25 | 2020-12-25 | Blast furnace cooling wall |
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Cited By (1)
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| CN117448507A (en) * | 2023-12-22 | 2024-01-26 | 河北万丰冶金备件有限公司 | Method for processing ring Zhou Zengjiang cooling wall and cooling wall thereof |
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