Bottom blowing brick and bottom blowing furnace

Abstract

The utility model discloses a bottom blowing brick and a bottom blowing furnace adopting the bottom blowing brick. The bottom blowing brick comprises a brick body, an air duct and a bottom blowing air duct, the bottom blowing air channel is vertically arranged in the brick body, and the bottom end of the bottom blowing air channel is communicated with an air duct arranged outside the brick body. An excitation stop block is arranged on the side wall of the lower portion of the inner cavity of the bottom blowing air channel, and a first air gap allowing air flow to pass through is reserved in the excitation stop block. According to the bottom blowing brick provided by the utility model, an original straight cylinder air channel structure is changed, and the turbulent flow unit is arranged in the bottom blowing air channel, so that bottom blowing air reaches a self-excited oscillation state in the air channel, and therefore, the bottom blowing brick periodically swings left and right to drive liquid in a larger range to flow, and a better bottom blowing effect is achieved.

Description

Technical Field

[0001] The utility model relates to a bottom-blown brick and belongs to the technical field of bottom-blowing. Background Art

[0002] The use of bottom blowing technology in electric furnace steelmaking was reported as early as the 1980s. The bottom blowing technology of electric arc furnace is beneficial to strengthen the stirring of the molten pool, promote the slag-steel reaction, uniform the composition and temperature of the molten steel, reduce the consumption of main and auxiliary materials in the steelmaking process, and improve the alloy yield. It is of great significance to the control of the composition and temperature of the molten steel.

[0003] In recent years, as the requirements for smelting rhythm and molten steel quality of electric arc furnaces have increased, strengthening the stirring of the molten pool has become increasingly important, which has promoted the research and application of bottom blowing technology of electric arc furnaces. As the name of the technology suggests, the bottom blowing technology of electric arc furnaces is to arrange bottom blowing bricks at the bottom of the electric arc furnace, and the gas (nitrogen, carbon dioxide and argon, argon can reduce the nitrogen content in steel) is blown into the furnace from bottom to top through the bottom blowing bricks at a certain pressure and flow rate, driving the surrounding molten steel to roll from bottom to top, thereby accelerating the flow of the bottom molten steel and the upper molten steel, which is conducive to uniform temperature of the upper and lower layers of the molten pool and accelerating the interface reaction of steel slag. At the same time, the bottom blowing gas forms bubbles after entering the molten pool, which can take away some nitrogen elements in the molten steel and play a denitrification role. Due to the reduction of the steel tapping temperature of the electric arc furnace and the content of iron oxide in the slag, the life of the furnace lining is increased. The bottom blowing technology of electric arc furnaces has been valued and developed in recent years. The industry has carried out a lot of research on the stirring ability of molten steel by bottom blowing brick materials, installation methods, and bottom blowing flow rates.

[0004] At present, only three air-permeable bricks are installed at the bottom of the electric arc furnace, distributed at an angle of 120°. Figure 6 As shown in the figure, the space between the air-permeable bricks and the set bricks is filled with furnace bottom ramming material, such as Figure 5 A bottom blowing brick is provided with several bottom blowing air channels. To prevent the molten steel from invading the bottom blowing air channels downward, the diameter of the hole of a single air channel varies from 0.6 to 1.5 mm.

[0005] For the entire bottom blowing system, theoretically, evenly arranging bottom blowing holes at the bottom of the electric arc furnace and using a high flow rate to eject gas from the bottom so that the molten steel flows from bottom to top is the best state for bottom blowing. However, since the bottom blowing bricks are exposed to a long-term working temperature of about 1600℃, they are eroded by the flow of molten steel and thermally corroded, and the life of the bottom blowing bricks is limited. Once the life of the bottom blowing bricks reaches the end, the steel mill has to shut down the furnace and replace the bottom blowing bricks and the furnace lining together, which has a great adverse impact on the smooth production and maintenance costs.

[0006] The current approach is to minimize the number of bottom-blowing bricks. As mentioned above, most medium-sized and large electric arc furnaces use a layout of three bottom-blowing bricks to achieve a certain bottom-blowing effect with the smallest layout area. Production practice exploration shows that this method can reduce the adverse effects of damage to bottom-blowing bricks to a certain extent, keep the life of bottom-blowing bricks consistent with the life of the electric arc furnace lining, and replace the bottom-blowing bricks together with the refractory materials. However, with the current common airway structure of bottom-blowing bricks, the bottom-blowing air is ejected from the airway and rushes into the molten steel in a fixed direction, which can only disturb a smaller area near the bottom-blowing bricks. Therefore, it is difficult for three air-permeable bricks to achieve the best bottom-blowing effect, and the effects of stirring, melting, denitrification, and temperature uniformity are limited. Utility Model Content

[0007] In view of the problem that in the prior art, after reducing the number of bottom-blown bricks at the bottom of the bottom-blown electric arc furnace, with the airway structure of ordinary bottom-blown bricks, the bottom blowing air can only form a disturbance effect on a smaller area near the bottom-blown bricks, and a small number of bottom-blown bricks are difficult to achieve the best bottom blowing effect, resulting in limited effects such as stirring, melting, denitrification and temperature equalization. The utility model proposes a bottom brick, a baffle is arranged inside the bottom blowing airway, the direction of the bottom blowing air is changed, so that the bottom blowing air forms a disturbance in a larger area after passing through the bottom blowing bricks, thereby improving the bottom blowing effect.

[0008] According to an embodiment of the utility model, a bottom-blown brick is provided.

[0009] A bottom-blown brick comprises a brick body, a ventilation pipe and a bottom-blowing airway. The bottom-blowing airway is vertically arranged in the brick body, and the bottom end of the bottom-blowing airway is connected to the ventilation pipe arranged outside the brick body. The characteristic is that an excitation block is arranged on the side wall of the lower part of the inner cavity of the bottom-blowing airway, and a first air gap is left in the excitation block for airflow to pass through.

[0010] Preferably, the distance between the excitation block and the lower end opening of the bottom blowing air channel is 35% to 50% of the length of the bottom blowing air channel, and preferably 37% to 46% of the length of the bottom blowing air channel.

[0011] Preferably, the length of the excitation block is 2% to 8% of the bottom blowing air channel 3, preferably 3% to 6.5%.

[0012] Preferably, the width of the first air gap is 8% to 60% of the diameter of the bottom blowing air channel, preferably 10% to 40%.

[0013] Preferably, the length of the first air gap is 70% to 100% of the diameter of the bottom blowing air channel, preferably 80% to 95%.

[0014] Preferably, the first air gap is any one of a rectangular, elliptical, S-shaped, and a cross-shaped, preferably a rectangular.

[0015] Preferably, the excitation stopper is detachably arranged on the lower side wall of the bottom blowing airway. Preferably, a first slide rail in a vertical direction is arranged on the lower side wall of the bottom blowing airway, and the first slide rail is closely connected to the bottom blowing airway. The excitation stopper is slidably and detachably arranged on the first slide rail.

[0016] Preferably, the bottom blowing brick further comprises an excitation outlet baffle on the upper side wall of the bottom blowing airway, and a second air gap is left in the excitation outlet baffle for airflow to pass through. An excitation inner cavity is formed between the excitation baffle, the excitation outlet baffle and the side wall of the bottom blowing airway.

[0017] Preferably, the distance between the excitation outlet baffle and the upper end opening of the bottom blowing air channel is 6.5% to 10% of the length of the bottom blowing air channel, and preferably 7% to 9% of the length of the bottom blowing air channel.

[0018] Preferably, the length of the excitation outlet baffle is 2% to 5%, preferably 2.5% to 4%, of the bottom blowing air channel.

[0019] Preferably, the length of the excitation inner cavity is 15% to 35%, preferably 17% to 31% of the bottom blowing air channel.

[0020] Preferably, the width of the second air gap is 30% to 80% of the diameter of the bottom blowing air channel, preferably 40% to 75%.

[0021] Preferably, the length of the second air gap is 70% to 100% of the diameter of the bottom blowing air channel, preferably 80% to 95%.

[0022] Preferably, the second air gap is any one of a rectangular, elliptical, S-shaped, and a cross-shaped, preferably a rectangular.

[0023] Preferably, the excitation outlet baffle is detachably arranged on the upper side wall of the bottom blowing air channel. Preferably, a second slide rail in a vertical direction is arranged on the upper side wall of the bottom blowing air channel, and the second slide rail is closely connected to the bottom blowing air channel. The excitation outlet baffle is slidably and detachably arranged on the second slide rail.

[0024] Preferably, the diameter of the bottom blowing air channel is 0.3 mm to 5 mm, preferably 0.8 mm to 1.5 mm.

[0025] Preferably, the length of the bottom blowing air channel is 200 mm to 500 mm, preferably 250 mm to 350 mm.

[0026] Preferably, the bottom blowing air channel is a hollow rectangular parallelepiped or cylindrical structure.

[0027] Preferably, the bottom-blown brick is provided with 1 to 5 bottom-blowing air passages, preferably 2 to 3 bottom-blowing air passages.

[0028] According to a second embodiment of the present invention, a bottom blowing furnace is provided.

[0029] A bottom blowing furnace comprises a furnace body, the bottom of the furnace body is the bottom blowing brick structure described in the first embodiment.

[0030] In the utility model, the bottom of the furnace body of the bottom blowing furnace is formed by the bottom blowing bricks described in the first embodiment.

[0031] Preferably, a total of 2 to 6 bottom-blown bricks are arranged at the bottom of the furnace body.

[0032] In the utility model, an excitation block is arranged inside the bottom blowing air channel. After the bottom blowing air enters the air channel, the airflow direction changes under the disturbance of the excitation block, thereby expanding the stirring effect of the bottom blowing airflow on the liquid in the bottom blowing furnace. Furthermore, the position and length of the excitation block inside the bottom blowing air channel are limited, and the width and length of the first air gap can also be limited, so as to achieve the purpose of expanding the influence range of the bottom blowing air.

[0033] In the utility model, an excitation outlet baffle is arranged on the upper side wall of the bottom blowing air duct. Under the dual action of the excitation baffle and the excitation outlet baffle, the bottom blowing airflow can realize self-excited oscillation of the airflow. After the bottom blowing air passes through the bottom blowing air duct, the blowing direction changes and it will swing left and right periodically, thereby expanding the influence range of the bottom blowing air and enhancing the liquid disturbance effect inside the furnace body.

[0034] In the utility model, since the working conditions occasionally change during the actual production process (such as the inner diameter of the bottom blowing furnace, the liquid inside the bottom blowing furnace, etc.), it is easy to affect the turbulence effect of the airway, resulting in a smaller disturbance range of the bottom blowing gas passing through the airway on the liquid. In this scheme, the excitation block (excitation outlet baffle) is detachably installed on the lower side wall (upper side wall) of the bottom blowing airway to adapt to different needs in the actual application process. When the working conditions change, the original excitation block and / or the excitation outlet baffle are removed, and replaced with different excitation blocks (excitation outlet baffles) of different lengths and widths according to needs to maintain a stable turbulence effect. Preferably, a slide rail tightly connected to the bottom blowing airway is provided on the lower side wall (upper side wall) of the bottom blowing airway to change the position of the excitation block and / or the excitation outlet baffle in the airway according to needs to adapt to changes in working conditions.

[0035] In the utility model, after the bottom blowing air enters the self-excited oscillation airway from the bottom through the air hole of the bottom blowing brick at 1.0~1.2MPa, under the joint action of the excitation block, the excitation cavity and the excitation outlet block, the position of the negative pressure zone of the excitation cavity will change periodically, thereby inducing the self-excited oscillation of the airflow, and the airflow will swing left and right periodically. Figure 3 a and Figure 3 b is the position where the bottom blowing airflow swings to its maximum amplitude. Figure 3The mid-air flow can deviate from the central axis by about 15°, with a change period of about 1 to 2 seconds. The traditional cylindrical airway can only disturb the molten steel in the vertical upper area, but it can be expanded to disturb the molten steel that deviates 15° to the left and right sides, so that more molten steel can flow up and down under the impetus of bottom blowing, thereby enhancing the effects of bottom blowing stirring, melting, denitrification, and temperature equalization.

[0036] In the utility model, the shape of the first air slit and / or the second air slit can be any one of a rectangular shape, an elliptical shape, an S shape, and a cross shape, so as to increase the influence range of the bottom blowing air.

[0037] In the present invention, the specific values ​​of the airway length and the airway diameter are determined by the requirements in the actual production process.

[0038] Compared with the prior art, the utility model has the following advantages:

[0039] 1. The bottom-blowing brick provided by the utility model changes the original straight-tube airway structure and arranges a turbulent unit inside the bottom-blowing airway, so that the bottom-blowing air reaches a self-excited oscillation state in the airway, thereby periodically swinging left and right, driving a larger range of liquid flow, and achieving a better bottom-blowing effect.

[0040] 2. The bottom blowing brick provided by the utility model can cope with complex working conditions. When the working conditions change, the positions of the excitation block and the excitation outlet baffle can be adjusted according to the actual situation, so that the bottom blowing gas can reach a self-excited oscillation state and realize a large range of liquid disturbance. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 The utility model provides a schematic structural diagram of a bottom blowing air duct in a bottom blowing brick.

[0042] Figure 2 The present invention provides a three-dimensional structural diagram of a bottom blowing air channel in a bottom blowing brick.

[0043] Figure 3 The utility model provides a bottom-blown brick bottom-blown airflow in the bottom-blown air channel process diagram of the periodic swing.

[0044] Figure 4 The utility model provides a schematic structural diagram of a bottom-blown brick.

[0045] Figure 5 The present invention is a schematic diagram of the structure of bottom blowing bricks of an electric arc furnace in the prior art.

[0046] Figure 6 It is a structural schematic diagram of an electric arc furnace bottom in the prior art.

[0047] Figure numerals: 1: brick body; 2: ventilation duct; 3: bottom blowing air channel; 301: excitation block; 302: first air gap; 303: excitation outlet baffle; 304: second air gap; 305: excitation inner cavity. DETAILED DESCRIPTION

[0048] The technical solution of the utility model is illustrated below, and the scope of protection requested for the utility model includes but is not limited to the following embodiments.

[0049] According to an embodiment of the utility model, a bottom-blown brick is provided.

[0050] A bottom-blown brick comprises a brick body 1, a ventilation pipe 2 and a bottom-blowing airway 3. The bottom-blowing airway 3 is vertically arranged in the brick body 1, and the bottom end of the bottom-blowing airway 3 is connected to the ventilation pipe 2 arranged outside the brick body 1. The bottom-blown brick is characterized in that an excitation block 301 is arranged on the side wall of the lower part of the inner cavity of the bottom-blowing airway 3, and a first air gap 302 is reserved in the excitation block 301 for airflow to pass through.

[0051] Preferably, the distance between the excitation block 301 and the lower end opening of the bottom blowing air channel 3 is 35% to 50% of the length of the bottom blowing air channel 3 , and preferably 37% to 46% of the length of the bottom blowing air channel 3 .

[0052] Preferably, the length of the excitation block 301 is 2% to 8% of the bottom blowing air channel 3, and preferably 3% to 6.5%.

[0053] Preferably, the width of the first air gap 302 is 8% to 60% of the diameter of the bottom blowing air channel, preferably 10% to 40%.

[0054] Preferably, the length of the first air gap 302 is 70% to 100% of the diameter of the bottom blowing air channel, preferably 80% to 95%.

[0055] Preferably, the first air gap 302 is any one of a rectangular, elliptical, S-shaped, and a cross-shaped, preferably a rectangular.

[0056] Preferably, the excitation stopper 301 is detachably arranged on the lower side wall of the bottom blowing air channel 3. Preferably, a first slide rail in a vertical direction is arranged on the lower side wall of the bottom blowing air channel 3, and the first slide rail is closely connected to the bottom blowing air channel 3. The excitation stopper 301 is slidably and detachably arranged on the first slide rail.

[0057] Preferably, the bottom blowing brick further comprises an excitation outlet baffle 303 on the upper side wall of the bottom blowing air channel 3, and a second air gap 304 for air flow to pass through is reserved in the excitation outlet baffle 303. An excitation inner cavity 305 is formed between the excitation baffle 301, the excitation outlet baffle 303 and the side wall of the bottom blowing air channel 3.

[0058] Preferably, the distance between the excitation outlet baffle 303 and the upper end opening of the bottom blowing air channel 3 is 6.5% to 10% of the length of the bottom blowing air channel 3, and preferably 7% to 9% of the length of the bottom blowing air channel 3.

[0059] Preferably, the length of the excitation outlet baffle 303 is 2% to 5% of the bottom blowing air channel 3, and preferably 2.5% to 4%.

[0060] Preferably, the length of the excitation inner cavity 305 is 15% to 35% of the bottom blowing air channel 3, preferably 17% to 31%.

[0061] Preferably, the width of the second air gap 304 is 30% to 80% of the diameter of the bottom blowing air channel 3, and preferably 40% to 75%.

[0062] Preferably, the length of the second air gap 304 is 70% to 100% of the diameter of the bottom blowing air channel 3, and preferably 80% to 95%.

[0063] Preferably, the second air gap 304 is in any one of a rectangular, elliptical, S-shaped, and cross-shaped shape, preferably a rectangular shape.

[0064] Preferably, the excitation outlet baffle 303 is detachably arranged on the upper side wall of the bottom blowing air channel 3. Preferably, a second slide rail in a vertical direction is arranged on the upper side wall of the bottom blowing air channel 3, and the second slide rail is closely connected to the bottom blowing air channel 3. The excitation outlet baffle 303 is slidably and detachably arranged on the second slide rail.

[0065] Preferably, the diameter of the bottom blowing air channel 3 is 0.3 mm to 5 mm, preferably 0.8 mm to 1.5 mm.

[0066] Preferably, the length of the bottom blowing air channel 3 is 200 mm to 500 mm, preferably 250 mm to 350 mm.

[0067] Preferably, the bottom blowing air channel 3 is a hollow rectangular parallelepiped or cylindrical structure.

[0068] Preferably, 1 to 5 bottom blowing air channels 3 are provided inside the bottom blowing brick, and preferably 2 to 3 bottom blowing air channels 3 are provided inside the bottom blowing brick.

[0069] According to a second embodiment of the present invention, a bottom blowing furnace is provided.

[0070] A bottom blowing furnace comprises a furnace body and bottom blowing bricks, wherein the bottom blowing bricks are arranged at the bottom of the furnace body.

[0071] Preferably, a total of 2 to 6 bottom-blown bricks are arranged at the bottom of the furnace body. Example 1

[0072] A bottom-blown brick comprises a brick body 1, a ventilation pipe 2 and a bottom-blowing airway 3. The bottom-blowing airway 3 is vertically arranged in the brick body 1, and the bottom end of the bottom-blowing airway 3 is connected to the ventilation pipe 2 arranged outside the brick body 1. The bottom-blown brick is characterized in that an excitation block 301 is arranged on the side wall of the lower part of the inner cavity of the bottom-blowing airway 3, and a first air gap 302 is reserved in the excitation block 301 for airflow to pass through. Example 2

[0073] Example 1 is repeated, except that the distance between the excitation block 301 and the lower end opening of the bottom blowing air channel 3 is 40% of the length of the bottom blowing air channel 3.

[0074] The length of the excitation block 301 is 5% of the bottom blowing air channel 3 . Example 3

[0075] Example 2 is repeated, except that the width of the first air gap 302 is 20% of the diameter of the bottom blowing air channel. Example 4

[0076] Example 3 is repeated, except that the length of the first air slit 302 is 90% of the diameter of the bottom blowing air channel. The first air slit 302 is rectangular. Example 5

[0077] The embodiment 4 is repeated, except that the excitation stopper 301 is detachably arranged on the lower side wall of the bottom blowing air channel 3. A first slide rail in a vertical direction is arranged on the lower side wall of the bottom blowing air channel 3, and the first slide rail is closely connected to the bottom blowing air channel 3. The excitation stopper 301 is slidably and detachably arranged on the first slide rail. Example 6

[0078] Example 5 is repeated, except that the bottom blowing brick further includes an excitation outlet baffle 303 on the upper side wall of the bottom blowing air channel 3, and a second air gap 304 for air flow to pass through is reserved in the excitation outlet baffle 303. An excitation inner cavity 305 is formed between the excitation baffle 301, the excitation outlet baffle 303 and the side wall of the bottom blowing air channel 3.

[0079] The distance between the excitation outlet baffle 303 and the upper opening of the bottom blowing air channel 3 is 8% of the length of the bottom blowing air channel 3 .

[0080] The length of the excitation outlet baffle 303 is 3% of the bottom blowing air channel 3 .

[0081] The length of the excitation inner cavity 305 is 25% of the bottom blowing air channel 3 . Example 7

[0082] Example 6 is repeated, except that the width of the second air gap 304 is 60% of the diameter of the bottom blowing air channel 3 .

[0083] The length of the second air gap 304 is 90% of the diameter of the bottom blowing air channel 3 .

[0084] The second air gap 304 is rectangular. Example 8

[0085] Example 7 is repeated, except that the excitation outlet baffle 303 is detachably arranged on the upper side wall of the bottom blowing air channel 3. A second slide rail in a vertical direction is arranged on the upper side wall of the bottom blowing air channel 3, and the second slide rail is closely connected to the bottom blowing air channel 3. The excitation outlet baffle 303 is slidably and detachably arranged on the second slide rail. Example 9

[0086] Example 8 was repeated, except that the diameter of the bottom blowing air channel 3 was 1.0 mm.

[0087] The length of the bottom blowing air channel 3 is 300 mm. Example 10

[0088] Repeat Example 9, wherein the bottom blowing air channel 3 is a hollow cylindrical structure.

[0089] Three bottom blowing air channels 3 are arranged inside the bottom blowing brick. Embodiment 11

[0090] A bottom blowing furnace comprises a furnace body and the bottom blowing bricks described in Example 10. Three bottom blowing bricks are evenly arranged at the bottom of the furnace body.

Claims

1. A bottom-blown brick, comprising a brick body (1), a ventilation pipe (2) and a bottom-blowing air channel (3); the bottom-blowing air channel (3) is vertically arranged in the brick body (1), and the bottom end of the bottom-blowing air channel (3) is connected to the ventilation pipe (2) arranged outside the brick body (1); characterized in that: An excitation block (301) is provided on the side wall of the lower part of the inner cavity of the bottom blowing air channel (3), and a first air gap (302) for air flow to pass through is reserved in the excitation block (301).

2. The bottom-blown brick according to claim 1 is characterized in that: The distance between the excitation block (301) and the lower end opening of the bottom blowing air channel (3) is 35% to 50% of the length of the bottom blowing air channel (3); and / or The length of the excitation block (301) is 2% to 8% of the bottom blowing air channel (3).

3. The bottom-blown brick according to claim 2 is characterized in that: The distance between the excitation block (301) and the lower end opening of the bottom blowing air channel (3) is 37% to 46% of the length of the bottom blowing air channel (3); and / or The length of the excitation block (301) is 3% to 6.5% of the bottom blowing air channel (3).

4. The bottom-blown brick according to claim 1, characterized in that: The width of the first air gap (302) is 8% to 60% of the diameter of the bottom blowing air channel; and / or The length of the first air gap (302) is 70% to 100% of the diameter of the bottom blowing air channel; and / or The first air gap (302) is any one of a rectangular shape, an elliptical shape, an S shape, and a cross shape.

5. The bottom-blown brick according to claim 4 is characterized in that: The width of the first air gap (302) is 10% to 40% of the diameter of the bottom blowing air channel; and / or The length of the first air gap (302) is 80% to 95% of the diameter of the bottom blowing air channel.

6. The bottom-blown brick according to any one of claims 1 to 5, characterized in that: The excitation stopper (301) is detachably arranged on the lower side wall of the bottom blowing air channel (3).

7. The bottom-blown brick according to claim 6, characterized in that: A first slide rail in a vertical direction is provided on the lower side wall of the bottom blowing air channel (3), and the first slide rail is closely connected to the bottom blowing air channel (3); the excitation block (301) is slidably and detachably arranged on the first slide rail.

8. The bottom-blown brick according to any one of claims 1 to 5 and 7, characterized in that: The bottom blowing brick also includes an excitation outlet baffle (303) on the upper side wall of the bottom blowing air channel (3), and a second air gap (304) is reserved in the excitation outlet baffle (303) for air flow to pass through; an excitation inner cavity (305) is formed between the excitation baffle (301), the excitation outlet baffle (303) and the side wall of the bottom blowing air channel (3).

9. The bottom-blown brick according to claim 8, characterized in that: The distance between the excitation outlet baffle (303) and the upper end opening of the bottom blowing air channel (3) is 6.5% to 10% of the length of the bottom blowing air channel (3); and / or The length of the excitation outlet baffle (303) is 2% to 5% of the bottom blowing air channel (3); and / or The length of the excitation inner cavity (305) is 15% to 35% of the bottom blowing air channel (3).

10. The bottom-blown brick according to claim 9, characterized in that: The distance between the excitation outlet baffle (303) and the upper end opening of the bottom blowing air channel (3) is 7% to 9% of the length of the bottom blowing air channel (3); and / or The length of the excitation outlet baffle (303) is 2.5% to 4% of the bottom blowing air channel (3); and / or The length of the excitation inner cavity (305) is 17% to 31% of the bottom blowing air channel (3).

11. The bottom-blown brick according to claim 8, characterized in that: The width of the second air gap (304) is 30% to 80% of the diameter of the bottom blowing air channel (3); and / or The length of the second air gap (304) is 70% to 100% of the diameter of the bottom blowing air channel (3); and / or The second air gap (304) is any one of a rectangular shape, an elliptical shape, an S shape, and a cross shape.

12. The bottom-blown brick according to claim 11, characterized in that: The width of the second air gap (304) is 40% to 75% of the diameter of the bottom blowing air channel (3); and / or The length of the second air gap (304) is 80% to 95% of the diameter of the bottom blowing air channel (3).

13. The bottom-blown brick according to claim 8, characterized in that: The excitation outlet baffle (303) is detachably arranged on the upper side wall of the bottom blowing air channel (3).

14. The bottom-blown brick according to claim 13, characterized in that: A second slide rail (307) in a vertical direction is provided on the upper side wall of the bottom blowing air channel (3), and the second slide rail (307) is closely connected to the bottom blowing air channel (3); the excitation outlet baffle (303) is slidably and detachably arranged on the second slide rail (307).

15. The bottom-blown brick according to any one of claims 1-5, 7, 9-14, characterized in that: The diameter of the bottom blowing air channel (3) is 0.3 mm to 5 mm; and / or The length of the bottom blowing air channel (3) is 200 mm to 500 mm; and / or The bottom blowing air channel (3) is a hollow rectangular parallelepiped or cylindrical structure.

16. The bottom-blown brick according to claim 8, characterized in that: The diameter of the bottom blowing air channel (3) is 0.3 mm to 5 mm; and / or The length of the bottom blowing air channel (3) is 200 mm to 500 mm; and / or The bottom blowing air channel (3) is a hollow rectangular parallelepiped or cylindrical structure.

17. The bottom-blown brick according to claim 15, characterized in that: The diameter of the bottom blowing air channel (3) is 0.8 mm to 1.5 mm; and / or The length of the bottom blowing air channel (3) is 250 mm to 350 mm.

18. The bottom-blown brick according to claim 16, characterized in that: The diameter of the bottom blowing air channel (3) is 0.8 mm to 1.5 mm; and / or The length of the bottom blowing air channel (3) is 250 mm to 350 mm.

19. The bottom-blown brick according to claim 15, characterized in that: One to five bottom blowing air passages (3) are arranged inside the bottom blowing brick.

20. The bottom-blown brick according to any one of claims 16 to 18, characterized in that: One to five bottom blowing air passages (3) are arranged inside the bottom blowing brick.

21. The bottom-blown brick according to claim 19, characterized in that: Two to three bottom blowing air passages (3) are arranged inside the bottom blowing brick.

22. The bottom-blown brick according to claim 20, characterized in that: Two to three bottom blowing air passages (3) are arranged inside the bottom blowing brick.

23. A bottom blowing furnace, characterized in that: The bottom of the furnace body of the bottom blowing furnace is a bottom blowing brick structure as described in any one of claims 1-22.

24. The bottom blowing furnace according to claim 23, characterized in that: A total of 2 to 6 bottom-blown bricks are arranged at the bottom of the furnace body.

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