A movable smoke hood sealing structure

Abstract

The present invention discloses a movable smoke hood sealing structure, the movable smoke hood sealing structure comprises an annular upper side plate (1), an annular lower side plate (2), an annular inner side plate (3), an annular outer side plate (4) and a fluid supply pipe (8), the annular upper side plate (1), the annular inner side plate (3), the annular lower side plate (2) and the annular outer side plate (4) are sequentially connected to form an annular transition chamber (11), the annular inner side plate (3) is provided with a plurality of first injection through holes (301), the plurality of first injection through holes (301) are arranged at intervals along the circumference of the annular inner side plate (3), the fluid supply pipe (8) is connected to the annular transition chamber (11), and the fluid in the fluid supply pipe (8) can be sprayed out from the first injection through holes (301) after passing through the annular transition chamber (11). Compared with the traditional movable smoke hood sealing method, the movable smoke hood sealing structure has a simple process and is easy to operate.

Description

Technical Field

[0001] The invention relates to the technical field of steelmaking equipment, in particular to a movable smoke hood sealing structure. Background Art

[0002] The converter vaporization cooling system is generally designed with the unburned method. The converter movable smoke hood is mainly used to recover the combustible part of CO in the converter flue gas to prevent CO leakage and ensure safe production. The converter vaporization cooling system needs to leave a certain gap between the fixed section of the furnace mouth and the movable smoke hood to ensure the free rise and fall of the movable smoke hood. In addition, it is necessary to control the amount of air entering between the fixed section of the furnace mouth and the movable smoke hood, and prevent the smoke from leaking out of the gap.

[0003] The existing movable smoke hood and the fixed section water-cooled wall of the furnace mouth generally use nitrogen sealing or steam sealing, such as the Chinese patent document CN 201406446 Y, published on February 17, 2010, which discloses "A movable smoke hood for a converter". Since the inlet furnace gas temperature is above 1500°C, a large amount of high-temperature furnace dust particles and furnace mouth splashes are ejected from the furnace mouth. The use of this movable smoke hood for a converter will cause the nitrogen (steam) nozzle to be blocked, resulting in poor sealing effect, thereby reducing the quality of the converter gas; the steam sealing method is prone to cause corrosion of the water-cooled wall near the steam nozzle, reducing the life of the flue. In addition, the movable smoke hood needs to be covered with nitrogen (steam) nozzles all around and penetrate into it, which is a complicated process. Summary of the invention

[0004] In order to solve the problem that the nozzle sealing structure of the existing movable smoke hood has a complicated manufacturing process, the present invention provides a movable smoke hood sealing structure. Compared with the traditional movable smoke hood sealing method, the movable smoke hood sealing structure has a simple process and is easy to operate.

[0005] The technical solution adopted by the present invention to solve its technical problems is: a movable smoke hood sealing structure, including an annular upper side plate, an annular lower side plate, an annular inner side plate, an annular outer side plate and a fluid supply pipe, the annular upper side plate and the annular lower side plate are arranged at intervals in the upper and lower directions, the annular inner side plate is sleeved in the annular outer side plate, the annular upper side plate, the annular inner side plate, the annular lower side plate and the annular outer side plate are connected in sequence to form an annular transition cavity, a plurality of first injection through holes are provided on the annular inner side plate, and the plurality of first injection through holes are arranged at intervals along the circumference of the annular inner side plate, the fluid supply pipe is connected with the annular transition cavity, and the fluid in the fluid supply pipe can pass through the annular transition cavity and be sprayed out from the first injection through holes.

[0006] The annular upper side plate is parallel to the horizontal plane, the annular upper side plate is parallel to the annular lower side plate, and the axis of the annular upper side plate coincides with the axis of the annular lower side plate.

[0007] The inner diameter of the annular upper side plate is the same as the inner diameter of the annular lower side plate, the outer diameter of the annular upper side plate is the same as the outer diameter of the annular lower side plate, and the distance between the annular upper side plate and the annular lower side plate is 20 mm.

[0008] The inner diameter of the annular inner plate is larger than the inner diameter of the annular upper plate, the outer diameter of the annular outer plate is smaller than the outer diameter of the annular upper plate, and the axis of the annular inner plate coincides with the axis of the annular outer plate.

[0009] An annular outer support plate is provided between the annular upper side plate and the annular lower side plate. The annular outer support plate is sleeved outside the annular outer side plate. The axes of the annular inner side plate, the annular upper side plate and the annular outer support plate coincide.

[0010] The outer diameter of the annular outer supporting plate is equal to the outer diameter of the annular upper side plate, and the annular outer side plate is located between the annular inner side plate and the annular outer supporting plate.

[0011] The fluid supply pipe is located below the annular lower side plate. The fluid supply pipe comprises a horizontal section and an elbow section which are connected in sequence. The elbow section of the fluid supply pipe is connected to the annular lower side plate.

[0012] At least one second injection through hole is also provided on the annular inner plate. The injection directions of the first injection through hole and the second injection through hole are both horizontally pointing to the axis of the annular inner plate. The aperture of the first injection through hole is 3 mm, and the distance between two adjacent first injection through holes is 50 mm. The second injection through hole is an upright long strip structure, and the lower end of the second injection through hole is connected to the annular lower plate.

[0013] An annular support flat steel and annular support round steel are fixedly connected below the annular lower side plate. The annular support flat steel is sleeved in the annular support round steel. The inner diameter of the annular support flat steel is larger than the outer diameter of the annular inner side plate, and the outer diameter of the annular support round steel is smaller than the inner diameter of the annular outer side plate.

[0014] The beneficial effects of the present invention are:

[0015] 1. The sealing chamber of the movable smoke hood sealing structure has a compact structure, a small area, and low nitrogen (steam) consumption.

[0016] 2. The movable smoke hood sealing structure is composed of an annular inner steel plate, an annular outer steel plate, an annular upper steel plate and an annular lower steel plate to form a transition cavity. The annular inner steel plate, the cavity annular upper steel plate, the annular lower steel plate and the furnace mouth section form a sealed cavity, and the fluid supply pipe is connected to the transition cavity. This steel plate sealing structure reduces the consumption of nitrogen (steam), effectively prevents the entry of high-temperature dust particles and furnace mouth splashes, avoids the blockage of the nozzle by a large amount of slag generated during the operation of the converter, enhances the sealing effect of the movable smoke hood, and improves the quality of the converter gas.

[0017] 3. Compared with the traditional movable smoke hood nitrogen (steam) sealing method, the process is simple and easy to operate.

[0018] 4. The sealed cavity can be drained through the opening at the bottom of the inner steel plate (i.e., the second injection hole). BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The drawings in the specification, which constitute a part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute improper limitations on the present invention.

[0020] Figure 1 It is a top view schematic diagram of the movable smoke hood sealing structure of the present invention.

[0021] Figure 2 yes Figure 1 A partial enlarged schematic diagram of .

[0022] Figure 3 is along Figure 1 Schematic diagram of the cross-section along the AA direction.

[0023] Figure 4 is a schematic diagram of the first injection through hole.

[0024] Figure 5 Schematic diagram of the second injection through hole.

[0025] 1. Annular upper side plate; 2. Annular lower side plate; 3. Annular inner side plate; 4. Annular outer side plate; 5. Annular outer support plate; 6. Annular support flat steel; 7. Annular support round steel; 8. Fluid supply pipe; 9. Refractory material structure; 10. Furnace mouth section; 11. Annular transition chamber; 12. Annular sealing chamber; 13. Water-cooled wall tube;

[0026] 301, a first injection through hole; 302, a second injection through hole;

[0027] 801, horizontal section; 802, elbow section. DETAILED DESCRIPTION

[0028] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0029] A movable smoke hood sealing structure comprises an annular upper side plate 1, an annular lower side plate 2, an annular inner side plate 3, an annular outer side plate 4 and a fluid supply pipe 8, wherein the annular upper side plate 1 and the annular lower side plate 2 are arranged at intervals in the upper and lower directions, and the annular inner side plate 3 and the annular outer side plate 4 are arranged at intervals in the inner and outer directions, and the annular upper side plate 1, the annular inner side plate 3, the annular lower side plate 2 and the annular outer side plate 4 are sequentially connected to form an annular transition chamber 11, and a plurality of first injection through holes 301 are arranged evenly at intervals along the circumference of the annular inner side plate 3, and the fluid supply pipe 8 is located outside the annular transition chamber 11, and the fluid supply pipe 8 is connected to the annular transition chamber 11, and the fluid in the fluid supply pipe 8 can be ejected from the first injection through holes 301 after passing through the annular transition chamber 11, such as Figures 1 to 4 shown.

[0030] During operation, the furnace mouth section 10 is sleeved in the movable smoke hood sealing structure, and an annular gap is formed between the furnace mouth section 10 and the movable smoke hood sealing structure, and an annular sealed cavity 12 is surrounded by the annular upper side plate 1, the annular lower side plate 2, the annular inner side plate 3 and the furnace mouth section 10. The annular upper side plate 1, the annular inner side plate 3, the annular lower side plate 2 and the annular outer side plate 4 are connected in sequence to form an annular transition cavity 11. The fluid (nitrogen or steam) passes through the fluid supply pipe 8 and the annular transition cavity 11 in sequence and is ejected from the first injection through hole 301 into the annular sealed cavity 12, thereby realizing the nitrogen (steam) sealing of the movable smoke hood. Compared with the existing nozzle, the first injection through hole 301 has a simple structure and is easy to process and manufacture.

[0031] In this embodiment, the annular upper side plate 1 and the annular lower side plate 2 are both in a horizontal state, the annular upper side plate 1 is parallel to the horizontal plane, the annular lower side plate 2 is parallel to the horizontal plane, the annular upper side plate 1 and the annular lower side plate 2 are parallel to each other up and down, and the axis of the annular upper side plate 1 coincides with the axis of the annular lower side plate 2.

[0032] In this embodiment, the inner diameter of the annular upper side plate 1 is the same as the inner diameter of the annular lower side plate 2, the outer diameter of the annular upper side plate 1 is the same as the outer diameter of the annular lower side plate 2, the thickness of the annular upper side plate 1 is substantially the same as the thickness of the annular lower side plate 2, and the distance between the annular upper side plate 1 and the annular lower side plate 2 is determined according to the amount of nitrogen (steam), which is about 20 mm. The movable smoke hood sealing structure has a compact structure, a small area, and a low nitrogen (steam) consumption.

[0033] In this embodiment, the inner diameter of the annular inner plate 3 is larger than the inner diameter of the annular upper plate 1, which can effectively prevent high-temperature dust particles and furnace mouth splashes from directly impacting and entering the first injection through hole 301, avoid the blockage of the nozzle by a large amount of slag generated during the operation of the converter, enhance the sealing effect of the movable smoke hood, and improve the quality of the converter gas. In addition, it also ensures the efficient input of nitrogen (steam), improves the sealing efficiency of the movable smoke hood, and prolongs the life of the flue.

[0034] In this embodiment, the outer diameter of the annular outer plate 4 is smaller than the outer diameter of the annular upper plate 1, and the axis of the annular inner plate 3 coincides with the axis of the annular outer plate 4. An annular outer support plate 5 is further provided between the annular upper plate 1 and the annular lower plate 2, and the annular outer support plate 5 is sleeved outside the annular outer plate 4, and the axis of the annular inner plate 3, the axis of the annular upper plate 1, and the axis of the annular outer support plate 5 coincide.

[0035] In this embodiment, the annular inner plate 3, the annular outer plate 4 and the annular outer support plate 5 are sequentially sleeved from the inside to the outside, and the wall thicknesses of the annular inner plate 3, the annular outer plate 4 and the annular outer support plate 5 can be the same, and the annular outer support plate 5 plays a role in supporting the annular sealing cavity 12. The outer diameter of the annular outer support plate 5 is equal to the outer diameter of the annular upper plate 1, and the annular outer plate 4 is located in the middle of the annular inner plate 3 and the annular outer support plate 5.

[0036] In this embodiment, the fluid supply pipe 8 can be located above or below the annular lower side plate 2. Preferably, the fluid supply pipe 8 is located below the annular lower side plate 2. There can be multiple fluid supply pipes 8, such as two. The fluid supply pipe 8 includes a horizontal section 801 and an elbow section 802 connected in sequence. The elbow section 802 of the fluid supply pipe 8 is connected to the annular lower side plate 2. Figure 3 shown.

[0037] In this embodiment, a plurality of second injection through holes 302 are further provided on the annular inner plate 3, and the plurality of second injection through holes 302 are evenly spaced along the circumference of the annular inner plate 3. The injection direction of the first injection through hole 301 and the injection direction of the second injection through hole 302 are both horizontally directed to the axis of the annular inner plate 3. The aperture of the first injection through hole 301 can be 3 mm, and the distance between two adjacent first injection through holes 301 can be 50 mm. The second injection through hole 302 is an upright long strip structure, and the lower end of the second injection through hole 302 is connected to the annular lower plate 2, such as Figure 4 and Figure 5 shown.

[0038] The first injection through hole 301 can be a circular through hole or a square through hole. The first injection through hole 301 mainly functions to inject the sealing fluid (nitrogen or steam) to form a sealing air curtain. The second injection through hole 302 mainly functions to discharge the accumulated water in the lower end of the annular transition chamber 11 when steam sealing is adopted, without affecting the quality of nitrogen (steam) and the sealing effect. For example, the number of the second injection through holes 302 can be four, and the corresponding circular angle between two adjacent second injection through holes 302 is 90 degrees.

[0039] In this embodiment, an annular support flat steel 6 and an annular support round steel 7 are fixedly connected below the annular lower side plate 2. The annular support flat steel 6 and the annular support round steel 7 are spaced apart from each other inside and outside. The cross-section of the annular support flat steel 6 is rectangular, and the cross-section of the annular support round steel 7 is circular. The inner diameter of the annular support flat steel 6 is larger than the outer diameter of the annular inner side plate 3, and the outer diameter of the annular support round steel 7 is smaller than the inner diameter of the annular outer side plate 4.

[0040] The following is a converter movable smoke hood, which includes a movable smoke hood sealing structure and a refractory material structure 9 arranged up and down. The movable smoke hood sealing structure is the above-mentioned movable smoke hood sealing structure. The refractory material structure 9 is an annular structure. The inner surface of the refractory material structure 9 includes a water-cooled wall tube 13, such as Figure 1 , Figure 2 and Figure 3 shown.

[0041] In this embodiment, the annular support flat steel 6 is fixed to the inner side of the upper end of the water-cooled wall tube 13, and the annular support round steel 7 is fixed to the outer side of the upper end of the water-cooled wall tube 13. The axis of the annular upper plate 1, the axis of the annular lower plate 2, the axis of the annular inner plate 3, the axis of the annular outer plate 4, the axis of the annular outer support plate 5, the axis of the annular support flat steel 6, the axis of the annular support round steel 7 and the axis of the refractory material structure 9 coincide.

[0042] In this embodiment, the annular upper plate 1, the annular lower plate 2, the annular inner plate 3, the annular outer plate 4, the annular outer support plate 5, the annular support flat steel 6, the annular support round steel 7 and the fluid supply pipe 8 are all made of metal, such as steel. The movable smoke hood sealing structure is also provided with a guide structure.

[0043] The sealing structure of the movable smoke hood and the working process of the movable smoke hood of the converter are introduced below.

[0044] During operation, the furnace mouth section 10 is sleeved in the movable smoke hood sealing structure, the axis of the furnace mouth section 10 coincides with the axis of the annular upper side plate 1, and an annular gap is formed between the furnace mouth section 10 and the movable smoke hood sealing structure. The annular upper side plate 1, the annular lower side plate 2, the annular inner side plate 3 and the furnace mouth section 10 form an annular sealed cavity 12. The annular upper side plate 1, the annular inner side plate 3, the annular lower side plate 2 and the annular outer side plate 4 are sequentially connected to form an annular transition cavity 11. The fluid (such as nitrogen or steam) of the fluid supply pipe 8 passes through the annular transition cavity 11 and is ejected from the first injection through hole 301 into the annular sealed cavity 12, forming a nitrogen or steam air curtain, thereby realizing the nitrogen (steam) movable seal of the movable smoke hood.

[0045] In order to facilitate understanding and description, the present invention adopts absolute position relationship for expression, wherein the directional word "up" means Figure 3 The upward direction in the Figure 3The present invention is described using the user's or reader's viewing angle, but the above-mentioned directional words cannot be understood or interpreted as limiting the protection scope of the present invention.

[0046] The above is only a specific embodiment of the present invention, and cannot be used to limit the scope of the invention. Therefore, the replacement of equivalent components, or equivalent changes and modifications made according to the protection scope of the present invention, should still fall within the scope of this patent. In addition, the technical features of the present invention can be freely combined with each other, with technical features and technical solutions, and with technical solutions.

Claims

1. A movable smoke hood sealing structure, characterized in that: The movable smoke hood sealing structure comprises an annular upper side plate (1), an annular lower side plate (2), an annular inner side plate (3), an annular outer side plate (4) and a fluid supply pipe (8); the annular upper side plate (1) and the annular lower side plate (2) are arranged at intervals in the upper and lower parts; the annular inner side plate (3) is sleeved in the annular outer side plate (4); the annular upper side plate (1), the annular inner side plate (3), the annular lower side plate (2) and the annular outer side plate (4) are sequentially connected to form an annular transition chamber (11); a plurality of first injection through holes (301) are provided on the annular inner side plate (3); the plurality of first injection through holes (301) are arranged at intervals along the circumference of the annular inner side plate (3); the fluid supply pipe (8) is connected to the annular transition chamber (11); the fluid in the fluid supply pipe (8) can pass through the annular transition chamber (11) and then be sprayed out from the first injection through holes (301); An annular outer support plate (5) is provided between the annular upper side plate (1) and the annular lower side plate (2), the annular outer support plate (5) is sleeved outside the annular outer side plate (4), and the axis of the annular inner side plate (3), the axis of the annular upper side plate (1) and the axis of the annular outer support plate (5) coincide with each other; The wall thickness of the annular inner plate (3), the wall thickness of the annular outer plate (4) and the wall thickness of the annular outer support plate (5) are the same, the outer diameter of the annular outer support plate (5) is equal to the outer diameter of the annular upper plate (1), and the annular outer plate (4) is located in the middle of the annular inner plate (3) and the annular outer support plate (5); At least one second injection through hole (302) is also provided on the annular inner side plate (3). The second injection through hole (302) is an upright long strip structure. The lower end of the second injection through hole (302) is connected to the annular lower side plate (2).

2. The movable smoke hood sealing structure according to claim 1, characterized in that: The annular upper side plate (1) is parallel to the horizontal plane, the annular upper side plate (1) is parallel to the annular lower side plate (2), and the axis of the annular upper side plate (1) coincides with the axis of the annular lower side plate (2).

3. The movable smoke hood sealing structure according to claim 1, characterized in that: The inner diameter of the annular upper side plate (1) is the same as the inner diameter of the annular lower side plate (2), the outer diameter of the annular upper side plate (1) is the same as the outer diameter of the annular lower side plate (2), and the distance between the annular upper side plate (1) and the annular lower side plate (2) is 20 mm.

4. The movable smoke hood sealing structure according to claim 1, characterized in that: The inner diameter of the annular inner plate (3) is greater than the inner diameter of the annular upper plate (1), the outer diameter of the annular outer plate (4) is smaller than the outer diameter of the annular upper plate (1), and the axis of the annular inner plate (3) coincides with the axis of the annular outer plate (4).

5. The movable smoke hood sealing structure according to claim 1, characterized in that: The fluid supply pipe (8) is located below the annular lower side plate (2). The fluid supply pipe (8) comprises a horizontal section (801) and an elbow section (802) which are connected in sequence. The elbow section (802) of the fluid supply pipe (8) is connected to the annular lower side plate (2).

6. The movable smoke hood sealing structure according to claim 1, characterized in that: The spraying direction of the first spray through hole (301) and the spraying direction of the second spray through hole (302) are both horizontally directed toward the axis of the annular inner plate (3); the aperture of the first spray through hole (301) is 3 mm, and the distance between two adjacent first spray through holes (301) is 50 mm.

7. The movable smoke hood sealing structure according to claim 1, characterized in that: An annular support flat steel (6) and an annular support round steel (7) are fixedly connected below the annular lower side plate (2); the annular support flat steel (6) is sleeved inside the annular support round steel (7); the inner diameter of the annular support flat steel (6) is larger than the outer diameter of the annular inner side plate (3); and the outer diameter of the annular support round steel (7) is smaller than the inner diameter of the annular outer side plate (4).

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