Novel converter center brick and bottom blowing structure

Abstract

The utility model discloses a novel converter center brick and bottom blowing structure, and relates to the technical field of converter linings, the novel converter center brick and bottom blowing structure comprises a converter, a center brick is arranged at the center position of the bottom in the converter, and a bundling pipe is pre-buried in the center brick; a plurality of bottom blowing bricks are arranged at the bottom in the converter at equal intervals in a circular array mode with the center brick as the center point, a cover plate is arranged at the top of the converter, an exhaust pipe is connected to the cover plate, the end, away from the cover plate, of the exhaust pipe is connected with a gas box, and the end, close to the cover plate, of the exhaust pipe is connected with a valve. A main discharge pipe is arranged on the side, away from the exhaust pipe, of the gas tank, filters are arranged at the two ends of the side, close to the gas tank, of the main discharge pipe, and a bundling pipe is pre-buried in a center brick, so that the blowing smelting function and a specific bottom blowing distribution mode can be achieved, molten steel components can be more uniform, the blowing time is obviously shortened, and the yield is obviously increased; and converter end point carbon-oxygen deposition is reduced, and the index is stable.

Description

Technical Field

[0001] The utility model relates to the technical field of converter linings, in particular to a novel converter center brick and bottom blowing structure. Background Art

[0002] The converter is a container for oxygen blowing steelmaking. It is generally barrel-shaped with a hemispherical bottom. The inside of the furnace shell is built with refractory materials. The center brick of the furnace bottom is the refractory lining of the converter. It is generally truncated in shape. The bottom bricks are built in a circle around the center brick. There are many bottom blowing bricks arranged at the bottom of the furnace for air blowing and stirring. The position and layout of the bottom blowing bricks and the blowing effect have a great influence on the final carbon and oxygen accumulation of the converter.

[0003] The carbon-oxygen product at the converter end point is an important indicator for evaluating the converter blowing effect. The lower the carbon-oxygen product, the lower the smelting cost and the better the molten steel quality. The traditional converter end point carbon-oxygen product fluctuates between 0.0028 and 0.0031, and the bottom blowing distribution is unreasonable. In the past, there was no center brick for blowing, and bottom blowing was used. This resulted in a single flow direction of molten steel, uneven blowing and stirring, prolonged blowing time, reduced output, high carbon-oxygen product at the converter end point, low molten steel quality and excessive alloy consumption. In order to reduce the converter end point carbon-oxygen product to below 0.0018, the inventor adjusted the bottom blowing distribution method, used the center brick of the furnace bottom for blowing, changed the flow direction of molten steel during blowing, made the stirring more uniform, and achieved the goal of reducing the oxygen product at the converter end point. Utility Model Content

[0004] The main purpose of the utility model is to provide a novel converter center brick and bottom blowing structure, which can effectively solve the problems in the background technology.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A novel converter center brick and bottom blowing structure, comprising a converter, wherein a center brick is arranged at the center position of the bottom of the converter, a cluster pipe is pre-embedded in the center brick, and a plurality of bottom blowing bricks are equidistantly arranged in a circular array at the bottom of the converter with the center brick as the center point, a cover plate is arranged on the top of the converter, an exhaust pipe is connected to the cover plate, an end of the exhaust pipe away from the cover plate is connected to an air box, an end of the exhaust pipe close to the cover plate is connected to a valve, a main exhaust pipe is arranged on the side of the air box away from the exhaust pipe, filters are arranged at both ends of the main exhaust pipe close to the air box, branch exhaust pipes are arranged at one end of the air box located at the filter, flange assemblies are arranged between the branch exhaust pipe and the filter, as well as between the filter and the main exhaust pipe, and the branch exhaust pipe and the filter, as well as the filter and the main exhaust pipe, are respectively connected via flange assemblies.

[0007] Preferably, the angle between two adjacent bottom-blown bricks is 60°.

[0008] Preferably, the number of the cluster tubes is 20-25, and the diameter thereof is 4-6 mm.

[0009] Preferably, the center brick is 50-100 mm higher than the furnace bottom brick.

[0010] Preferably, the number of the bottom-blown bricks is six.

[0011] Compared with the prior art, the utility model has the following beneficial effects:

[0012] 1. The cluster tube embedded in the center brick can realize the function of blowing smelting. The specific bottom blowing distribution method can make the molten steel composition more uniform, significantly shorten the blowing time, significantly increase the output, reduce the carbon and oxygen accumulation at the end of the converter and stabilize the indicators.

[0013] 2. During air blowing, the gas is discharged into the air box through the exhaust pipe through the opening of the valve, and is filtered through the filter connected to the branch pipe. The filtered gas is then discharged uniformly through the main exhaust pipe, which not only plays a role in reducing the pressure and exhausting the gas in the converter during air blowing, but also can filter the exhausted gas. The double filtration can increase the gas filtration rate and avoid the problem of high air pressure in the air box and inability to discharge the gas in the converter at a uniform speed due to accumulation. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of a new type of converter center brick and bottom blowing structure during molten steel blowing of the utility model;

[0015] Figure 2 It is a schematic diagram of the top view of the internal structure of a converter with a new type of converter center brick and bottom blowing structure of the utility model;

[0016] Figure 3 This is a schematic diagram of a novel converter center brick and a center brick and cluster tube structure of a bottom blowing structure according to the utility model.

[0017] In the figure: 1. converter; 2. center brick; 21. cluster pipe; 3. bottom blowing brick; 4. cover plate; 5. exhaust pipe; 6. valve; 7. gas box; 8. branch pipe; 9. filter; 10. main exhaust pipe; 11. flange assembly. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] like Figure 1-3As shown, a novel converter center brick and bottom blowing structure comprises a converter 1, a center brick 2 is arranged at the center position of the bottom of the converter 1, a cluster pipe 21 is pre-buried in the center brick 2, a plurality of bottom blowing bricks 3 are equidistantly arranged in a circular array at the bottom of the converter 1 with the center brick 2 as the center point, a cover plate 4 is arranged on the top of the converter 1, an exhaust pipe 5 is connected to the cover plate 4, an end of the exhaust pipe 5 away from the cover plate 4 is connected to an air box 7, an end of the exhaust pipe 5 close to the cover plate 4 is connected to a valve 6, a main exhaust pipe 10 is arranged on the side of the air box 7 away from the exhaust pipe 5, filters 9 are arranged at both ends of the main exhaust pipe 10 close to the air box 7, branch exhaust pipes 8 are arranged at one end of the air box 7 located at the filter 9, flange assemblies 11 are arranged between the branch exhaust pipes 8 and the filter 9 as well as between the filter 9 and the main exhaust pipe 10, the branch exhaust pipes 8 and the filter 9 as well as the filter 9 and the main exhaust pipe 10 are respectively connected by the flange assemblies 11, and the filtering body in the filter 9 can be active carbon, filter cotton, etc., which are arranged as required.

[0020] In this embodiment, the angle between two adjacent bottom-blown bricks 3 is 60°.

[0021] In this embodiment, the number of the cluster tubes 21 is 20-25, and the diameter thereof is 4-6 mm.

[0022] In this embodiment, the center brick 2 is 50-100 mm higher than the furnace bottom brick.

[0023] In this embodiment, the number of bottom blowing bricks 3 is six.

[0024] Specific:

[0025] Six bottom-blowing bricks 3 are distributed in a circular array at the inner bottom of the converter 1 with the center brick 2 as the center point. The angle between adjacent bottom-blowing bricks 3 is 60°. When blowing, the oxygen gun is first lowered and adjusted to an appropriate position to start blowing. Then the cluster pipe 21 of the center brick 2 is controlled for blowing. After blowing for 30 seconds, the bottom-blowing brick 3 is opened. The blowing parts inside the bottom-blowing brick 3 are single-tube annular seam blowing or cluster pipe blowing. The specific settings are based on the needs of the steel plant. After the blowing parts on the bottom-blowing brick 3 are blown, the flow direction of the molten steel will appear as follows: Figure 1 As shown, the cluster tube 21 blows the molten steel in this area upward, and the blowing component on the bottom blowing brick 3 blows the molten steel in this area at an inclined angle, and the flow direction of the blown molten steel collides with the flow direction of the molten steel blown by the cluster tube 21, forming a stirring effect, making the stirring more uniform;

[0026] The gas during air blowing is discharged into the air box 7 through the exhaust pipe 5 through the opening of the valve 6, and is filtered by the filter 9 connected to the branch pipe 8. The filter element in the filter 9 can be activated carbon or filter cotton, and the specific setting depends on the needs of the steel plant. The filtered gas is then discharged uniformly through the main exhaust pipe 10, which not only plays the role of reducing the pressure and exhausting the gas in the converter 1 during air blowing, but also can filter the exhausted gas. The double filtration can increase the gas filtration rate, avoiding the problem of high air pressure in the air box 7 and the inability to discharge the gas in the converter 1 at a uniform speed due to accumulation.

[0027] The circuits, electronic components and control modules involved are all prior art and can be fully implemented by those skilled in the art. Needless to say, the content protected by the utility model does not involve improvements to software and methods.

[0028] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A novel converter center brick and bottom blowing structure, comprising a converter (1), Features: A center brick (2) is arranged at the center position of the bottom of the converter (1), a cluster tube (21) is pre-buried in the center brick (2), a plurality of bottom-blowing bricks (3) are arranged equidistantly in a circular array at the bottom of the converter (1) with the center brick (2) as the center point, a cover plate (4) is arranged at the top of the converter (1), an exhaust pipe (5) is connected to the cover plate (4), an end of the exhaust pipe (5) away from the cover plate (4) is connected to an air box (7), and an end of the exhaust pipe (5) close to the cover plate (4) is connected to a valve (6) A main exhaust pipe (10) is provided on a side of the air box (7) away from the exhaust pipe (5), filters (9) are provided at both ends of the main exhaust pipe (10) on a side close to the air box (7), a branch exhaust pipe (8) is provided on one end of the air box (7) located at the filter (9), flange components (11) are provided between the branch exhaust pipe (8) and the filter (9) and between the filter (9) and the main exhaust pipe (10), and the branch exhaust pipe (8) and the filter (9) and the filter (9) and the main exhaust pipe (10) are connected respectively via the flange components (11).

2. A new type of converter center brick and bottom blowing structure according to claim 1, Features: The included angle between two adjacent bottom-blown bricks (3) is 60°.

3. According to the novel converter center brick and bottom blowing structure of claim 1, Features: The number of the cluster tubes (21) is 20-25, and the diameter thereof is 4-6 mm.

4. A new type of converter center brick and bottom blowing structure according to claim 1, Features: The center brick (2) is 50-100 mm higher than the furnace bottom brick.

5. A new type of converter center brick and bottom blowing structure according to claim 1, Features: The number of the bottom-blown bricks (3) is six.

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