Long-acting converter bottom blowing brick

Abstract

The invention belongs to the technical field of bottom blowing of converter smelting, and particularly relates to a long-acting converter bottom blowing brick which comprises a brick body and a plurality of spray pipes distributed on the brick body, and is characterized in that the spray pipes comprise straight spray pipes and inclined spray pipes, the straight spray pipes are arranged in the middle of the brick body in a rectangular array or a circular array, and a plurality of circles of inclined spray pipes are arranged on the peripheries of the straight spray pipes; the inclined spray pipe is composed of an inclined section with the top extending outwards and a straight section at the bottom, and the included angle between the inclined section and the straight section is alpha. Compared with the prior art, the long-acting converter bottom blowing brick has the beneficial effects that the nozzle structure and the arrangement form of the bottom blowing brick are changed, the influence of water hammer scouring on the service life of the bottom blowing brick can be well overcome, and the service period of the converter bottom blowing brick is remarkably prolonged, so that converter production is smoother, and the production cost is reduced; the manufacturing cost of the converter bottom blowing brick is low and is the same as that of a common converter bottom blowing brick; the use method of the bottom blowing brick is the same as that of a universal converter bottom blowing brick and is easy to master.

Description

Technical Field

[0001] The invention belongs to the technical field of bottom blowing of converter smelting, and in particular relates to a long-acting converter bottom blowing brick. Background Art

[0002] At present, medium and large converters all use bottom blowing, which has many outstanding advantages: such as improving smelting efficiency, increasing molten pool mixing efficiency, facilitating decarburization and slag formation, and stable operation without splashing. However, the service life of bottom-blown bricks is short and needs to be replaced regularly. The main reason for the short service life of bottom-blown bricks is the "water hammer scouring" phenomenon caused by air blowing. "Water hammer scouring" refers to when bubbles break away from the end of the nozzle, driving the molten steel near the end of the nozzle to flow upward, and the molten steel on the outside is replenished into the end of the nozzle to form a "replenishment flow". The direction of the "replenishment flow" is parallel to the surface of the refractory material, so it is horizontal in the initial stage and points to the end of the nozzle, thereby forming a circulation. The scouring of the refractory material around the end of the nozzle by the "replenishment flow" causes pits to appear in the bottom-blown bricks until they fail.

[0003] The Chinese invention patent with application number 201911338742.4 discloses a method for improving the bottom blowing effect of a converter. An even number of bottom blowing bricks are arranged on the inner and outer concentric circles of the converter bottom with the center of the bottom as the center, namely inner circle bottom blowing bricks and outer circle bottom blowing bricks. The angles formed by the lines connecting the centers of the two adjacent inner circle bottom blowing bricks and the circles are ≥40°, and the angles formed by the lines connecting the centers of the two adjacent outer circle bottom blowing bricks and the circles are ≥40°; the radius of the inner concentric circle is 30-35% of the radius of the inner bottom surface of the bottom, and the radius of the outer concentric circle is 6 of the radius of the inner bottom surface of the bottom. 0~70%; half of the inner circle bottom blown bricks and half of the outer circle bottom blown bricks are set as the first group of bottom blown bricks, and the remaining bottom blown bricks are set as the second group of bottom blown bricks, and the first group of bottom blown bricks and the second group of bottom blown bricks are arranged at intervals on their corresponding concentric circles; in the early stage of furnace service, the first group of bottom blown bricks adopts weak air supply, and the second group of bottom blown bricks adopts conventional air supply; in the middle stage of furnace service, the first group of bottom blown bricks adopts conventional air supply, and the second group of bottom blown bricks adopts weak air supply; from the end of the middle stage of furnace service to the end of furnace service, all bottom blown bricks adopt conventional air supply; among which, the air supply flow rate of weak air supply is 1 / 4~1 / 3 of the air supply flow rate of conventional air supply.

[0004] The Chinese invention patent with application number CN202311465148.8 discloses a method for improving the bottom blowing life of a vanadium extraction converter, increasing the cooling surface area of ​​the bottom blowing bricks, slowing down the high-temperature erosion of refractory materials, and at the same time increasing the bottom blowing thickness by 40mm-60mm to further enhance the bottom blowing's anti-erosion ability.

[0005] The above improvements have not brought about any significant changes to the structure of bottom-blown bricks, and are far from achieving the ideal effect. The life of ordinary bottom-blown bricks is about 5,000 furnaces, which cannot meet the needs well. This problem has never been effectively solved, which has seriously affected the smooth operation of converter smelting and increased production costs. Summary of the invention

[0006] The purpose of the present invention is to provide a long-lasting converter bottom blowing brick, overcome the shortcomings of the prior art, change the nozzle structure and layout of the bottom blowing brick, overcome the influence of "water hammer scouring" on the life of the bottom blowing brick, and extend the service life of the converter bottom blowing brick, thereby making the converter production smoother and reducing production costs.

[0007] To achieve the above object, the present invention is implemented through the following technical solutions:

[0008] A long-acting converter bottom-blown brick comprises a brick body, on which a plurality of nozzles are distributed, wherein the nozzles comprise straight nozzles and oblique nozzles, wherein the straight nozzles are arranged in a rectangular array or a circular array in the middle of the brick body, and a plurality of circles of oblique nozzles are arranged on the periphery of the straight nozzles; the oblique nozzles consist of an oblique section extending outward at the top and a straight section at the bottom, and an angle α is included between the oblique section and the straight section.

[0009] Furthermore, the diameter of the oblique nozzle is smaller than that of the straight nozzle, and the adjacent spacing of the oblique nozzle is 1 / 2 to 1 / 5 times of the adjacent spacing of the straight nozzle.

[0010] Furthermore, the inner diameter of the straight nozzle is 1-3 mm, the inner diameter of the oblique nozzle is 0.5-1.5 mm, and the inner diameter ratio of the straight nozzle to the oblique nozzle is 1.5-2.5.

[0011] Furthermore, the oblique nozzles are arranged in 1-3 circles.

[0012] Furthermore, the angle α is 20° to 75°.

[0013] Furthermore, the distance between the straight section of the oblique nozzle and the straight nozzle is 3-5 mm.

[0014] Furthermore, the adjacent spacing between the inclined nozzles is 0.6-5 mm.

[0015] Furthermore, the length ratio of the inclined section to the straight section in the inclined nozzle is 1:3-1:10.

[0016] Furthermore, the brick body is any one of a cylinder, a truncated cone, a hexagonal pyramid, a cuboid, and a cube.

[0017] Furthermore, the adjacent spacing between the straight nozzles is 3 to 10 mm.

[0018] The working principle of the long-acting converter bottom blowing brick of the present invention to prevent "water hammer scour" is as follows:

[0019] First, the oblique nozzles are densely arranged in the outermost circle, which acts as a "gas wall" to reduce the amount of molten steel flowing into the nozzle area along the refractory surface, thereby weakening the "water hammer scouring" effect of molten steel on all the straight nozzle nozzles;

[0020] Secondly, the outlet of the inclined nozzle is inclined toward the outside of the bottom blowing brick, and the airflow drives the molten steel away from the outlet of the "inclined nozzle", which can significantly reduce the "water hammer scouring" effect of the molten steel on the outlet of the "inclined nozzle", that is, it protects itself;

[0021] Third, the diameter of the oblique nozzle is smaller than that of the straight nozzle, so the gas flow rate is also much smaller than that of the straight nozzle. Therefore, it can also significantly reduce the "water hammer scouring" effect of the molten steel on the outlet of the "oblique nozzle", so that all nozzles including the straight nozzle and the oblique nozzle are protected.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1) The long-acting converter bottom-blown brick of the present invention changes the nozzle structure and arrangement of the bottom-blown brick, which can well overcome the influence of "water hammer scouring" on the life of the bottom-blown brick, significantly extend the service life of the converter bottom-blown brick, thereby making the converter production smoother and reducing the production cost;

[0024] 2) The manufacturing cost of the converter bottom blowing brick of the present invention is low, which is the same as that of the common converter bottom blowing brick;

[0025] 3) The bottom-blown bricks of the present invention are used in the same manner as the common converter bottom-blown bricks and are easy to master. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the structure of an embodiment of the present invention;

[0027] Figure 2 yes Figure 1 Top view of the .

[0028] In the figure: 1-brick body; 2-straight nozzle; 3-inclined nozzle; 4-inclined section; 5-straight section. DETAILED DESCRIPTION

[0029] The technical solution of the present invention will be clearly and completely described below in conjunction with specific embodiments. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the specific embodiments required to be used in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the specific embodiments described below are some implementation methods of the present invention. For ordinary technicians in this field, other specific embodiments can be obtained based on these specific embodiments without paying creative work.

[0031] The components of the embodiments of the present invention generally described and shown in the specific embodiments herein can be arranged and designed in countless different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the specific embodiments is not intended to limit the scope of the invention claimed, but merely represents selected embodiments of the present invention.

[0032] See Figure 1-2 , is a schematic diagram of the structure of an embodiment of a long-acting converter bottom-blown brick of the present invention, comprising a brick body 1, on which a plurality of nozzles are distributed, the nozzles comprising a straight nozzle 2 and an inclined nozzle 3, the straight nozzle 2 being arranged in a rectangular array or a circular array in the middle of the brick body 1, and a plurality of circles of inclined nozzles 3 being arranged on the periphery of the straight nozzle 2; the inclined nozzle 3 is composed of an inclined section 4 extending outward at the top and a straight section 5 at the bottom, and the angle α between the inclined section 4 and the straight section 5. The diameter of the inclined nozzle 3 is smaller than that of the straight nozzle 2, and the adjacent spacing of the inclined nozzle 3 is 1 / 2 to 1 / 5 times that of the adjacent spacing of the straight nozzle 2.

[0033] The inner diameter of the straight nozzle 2 is 1-3 mm, the inner diameter of the oblique nozzle 3 is 0.5-1.5 mm, and the inner diameter ratio of the straight nozzle 2 / oblique nozzle 3 is 1.5-2.5. The length ratio of the oblique section 4 to the straight section 5 in the oblique nozzle 3 is 1:3-1:10. The adjacent spacing of the straight nozzle 2 is 2.5-3.5 mm. The oblique nozzles 3 are arranged in 1-3 circles. The angle α is 20°-75°. The spacing between the straight section 5 of the oblique nozzle 3 and the straight nozzle 2 is 3-5 mm. The adjacent spacing of the oblique nozzles 3 is 0.6-5 mm.

[0034] The brick body 1 is any one of a cylinder, a truncated cone, a hexagonal cone, a cuboid, and a cube.

[0035] Example 1

[0036] Take the bottom blowing bricks for 250-ton converter combined blowing smelting as an example.

[0037] The brick body 1 is a truncated cone, and the oblique nozzles 3 are arranged around the periphery of the straight nozzles 2, and the distribution density ratio of the oblique nozzles to the straight nozzles is 2.

[0038] The inner diameter of the straight nozzle 2 is 2 mm, the inner diameter of the oblique nozzle 3 is 1.0 mm, and the inner diameter ratio of the straight nozzle 2 / oblique nozzle 3 is 2. The length ratio of the oblique section 4 to the straight section 5 in the oblique nozzle 3 is 1:3. The adjacent spacing of the straight nozzle 2 is 5 mm. The angle α is 50°. The spacing between the straight section 5 of the oblique nozzle 3 and the straight nozzle 2 is 5 mm. The adjacent spacing of the oblique nozzle 3 is 1.5 mm.

[0039] When the embodiment 1 of the present invention is used, the bottom blowing bricks are assembled at the corresponding position of the converter shell, the converter blowing is started, and the bottom blowing is started according to the conventional process; the long-acting converter bottom blowing bricks of the present invention are replaced regularly.

[0040] The bottom-blown bricks of Example 1 of the present invention have a service life of 12530 furnaces, which is synchronized with the furnace age. The service life of the bottom-blown bricks of Example 1 of the present invention is 2.5 times that of ordinary bottom-blown bricks.

[0041] Example 2

[0042] Take the bottom blowing bricks for 120-ton converter combined blowing smelting as an example.

[0043] The brick body 1 is a truncated cone, and the oblique nozzle 3 is arranged around the periphery of the straight nozzle 2, and the distribution density ratio of the oblique nozzle to the straight nozzle is 2. The inner diameter of the straight nozzle 2 is 1.5mm, the inner diameter of the oblique nozzle 3 is 0.6mm, and the inner diameter ratio of the straight nozzle 2 / oblique nozzle 3 is 2.5. The length ratio of the oblique section 4 to the straight section 5 in the oblique nozzle 3 is 1:4. The adjacent spacing of the straight nozzle 2 is 8mm. The angle α is 60°. The spacing between the straight section 5 of the oblique nozzle 3 and the straight nozzle 2 is 5mm. The adjacent spacing of the oblique nozzle 3 is 2mm.

[0044] The use process of Example 2 of the present invention is the same as that of Example 1.

[0045] The bottom-blown bricks of Example 2 of the present invention have a service life of 11260 furnaces, which is synchronized with the furnace age. The service life of the bottom-blown bricks of Example 2 of the present invention is 2.25 times that of ordinary bottom-blown bricks.

[0046] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A long-acting converter bottom blowing brick, comprising a brick body, on which a plurality of nozzles are distributed, characterized in that: The nozzles include straight nozzles and oblique nozzles. The straight nozzles are arranged in a rectangular array or a circular array in the middle of the brick body, and a plurality of circles of oblique nozzles are arranged on the periphery of the straight nozzles. The oblique nozzles are composed of an oblique section extending outward at the top and a straight section at the bottom, and an angle α is formed between the oblique section and the straight section.

2. The long-acting converter bottom blowing brick according to claim 1 is characterized in that: The diameter of the oblique nozzle is smaller than that of the straight nozzle, and the adjacent spacing of the oblique nozzle is 1 / 2 to 1 / 5 times of the adjacent spacing of the straight nozzle.

3. The long-acting converter bottom blowing brick according to claim 2 is characterized in that: The inner diameter of the straight nozzle is 1-3 mm, the inner diameter of the oblique nozzle is 0.5-1.5 mm, and the inner diameter ratio of the straight nozzle to the oblique nozzle is 1.5-2.

5.

4. The long-acting converter bottom blowing brick according to claim 1 is characterized in that: The oblique nozzles are arranged in 1-3 circles.

5. The long-acting converter bottom blowing brick according to claim 1 is characterized in that: The angle α is 20° to 75°.

6. The long-acting converter bottom blowing brick according to claim 1, characterized in that: The distance between the straight section of the oblique nozzle and the straight nozzle is 3-5 mm.

7. The long-acting converter bottom blowing brick according to claim 1 is characterized in that: The adjacent spacing between the oblique nozzles is 0.6-5 mm.

8. The long-acting converter bottom blowing brick according to claim 1 is characterized in that: The length ratio of the oblique section to the straight section in the oblique nozzle is 1:3-1:

10.

9. The long-acting converter bottom blowing brick according to claim 1, characterized in that: The brick body is any one of a cylinder, a truncated cone, a hexagonal cone, a cuboid, and a cube.

10. The long-acting converter bottom blowing brick according to claim 1, characterized in that: The adjacent spacing between the straight nozzles is 3 to 10 mm.

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