Blast furnace baking tuyere air guide pipe connecting device

Abstract

The utility model belongs to the technical field of blast furnace baking tuyere air guide pipe connection, and particularly relates to a blast furnace baking tuyere air guide pipe connection device which comprises a tuyere large sleeve, the tuyere large sleeve is connected with a furnace shell through a flange plate, and the tuyere large sleeve is connected with a tuyere medium sleeve through a conical surface connection structure. The tuyere medium sleeve is connected with the tuyere small sleeve through a conical surface connecting structure, the tuyere small sleeve is connected with the air guide pipe through a conical surface connecting structure, and horn mouths are formed in the first end and the second end of the air guide pipe; the blast furnace baking tuyere air guide pipe connecting device disclosed by the utility model is not easy to damage, long in service life and good in air guide effect; the blast furnace baking tuyere air guide pipe connecting device is simple in structure and convenient to disassemble and assemble, and baking of the furnace bottom is sufficient; according to the blast furnace baking tuyere air guide pipe connecting device, the tuyere air guide effect can be improved, water in masonry is discharged, masonry refractory materials are solidified, cracking and peeling caused by rapid temperature rise after blow-in are avoided, the service life of a blast furnace is prolonged, and meanwhile, smooth yield reaching and efficiency reaching after blow-in are facilitated.

Description

Technical Field

[0001] The utility model belongs to the technical field of connecting air ducts at the tuyere of a blast furnace, and in particular relates to a connecting device for an air duct at the tuyere of a blast furnace. Background Art

[0002] A newly built blast furnace or a blast furnace after overhaul is at room temperature. The refractory brick lining in the furnace contains a lot of moisture. The moisture must be dried before the blast furnace can be put into production. The key to furnace drying operation is to control the heating rate to no more than 15℃ / h to avoid the lining from cracking due to too fast evaporation of moisture. The hot air used in the blast furnace is provided by the hot blast furnace, enters the furnace from the blast furnace tuyere, and is first directed to the bottom of the furnace through the tuyere air duct. Then the hot air flows upward from the bottom of the furnace. In the process of the hot air flowing upward, the moisture in the furnace lining is taken away at the same time. Finally, the furnace exhaust gas is discharged from the top of the furnace. The existing blast furnace tuyere air duct connection device has poor effect, and the method for connecting the blast furnace tuyere and the air duct is not disclosed.

[0003] Therefore, a device for connecting the blast furnace tuyere and the air guide duct is provided. Utility Model Content

[0004] The utility model aims to provide a blast furnace tuyere air guide pipe connecting device.

[0005] The utility model solves the technical problem by adopting the following technical solution: a blast furnace tuyere air duct connection device, comprising a large tuyere sleeve, the large tuyere sleeve is connected to the furnace shell through a flange, the large tuyere sleeve is connected to the middle tuyere sleeve through a conical connection structure, the middle tuyere sleeve is connected to the small tuyere sleeve through a conical connection structure, the small tuyere sleeve is connected to the air duct through a conical connection structure, and bell mouths are provided at the first end and the second end of the air duct.

[0006] Specifically, the middle tuyere sleeve and the small tuyere sleeve are both provided with a cooling water inlet and a cooling water outlet.

[0007] Specifically, the first end and the second end of the air guide pipe are both welded with steel pipes, and the first end and the second end of the air guide pipe are both bell-shaped.

[0008] Specifically, pressure-charging elbows are welded between the steel pipes.

[0009] Specifically, the conical surface of the bell mouth at the first end of the air guide pipe has the same curvature as the conical surface of the tuyere sleeve, and the bell mouth at the first end of the air guide pipe penetrates deep into the tuyere sleeve.

[0010] The utility model has the following beneficial effects:

[0011] 1) The blast furnace tuyere air guide pipe connection device of the utility model is not easy to be damaged, has a long service life, and has a good air guide effect;

[0012] 2) The blast furnace tuyere air guide pipe connection device of the utility model has a simple structure, is easy to disassemble and assemble, and the furnace bottom is fully baked;

[0013] 3) The utility model of the blast furnace tuyere air guide duct connection device can improve the air guiding effect of the tuyere, discharge the moisture in the masonry, consolidate the masonry refractory material, avoid cracking and peeling caused by rapid temperature rise after the furnace is opened, extend the service life of the blast furnace, and facilitate smooth production and efficiency after the furnace is opened. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the structure of the utility model;

[0015] Figure 2 This is a combined connection diagram of the air duct of the utility model.

[0016] In the figure: 1-large tuyere sleeve; 2-middle tuyere sleeve; 3-small tuyere sleeve; 4-furnace shell; 5-flange; 6-cooling water pipe of middle tuyere sleeve; 7-cooling water pipe of small tuyere sleeve; 8-air duct; 811-first end of air duct; 812-second end of air duct; 821-pressurization elbow; 831-steel pipe. DETAILED DESCRIPTION

[0017] The utility model will now be further described in detail with reference to the accompanying drawings.

[0018] like Figure 1-2 As shown, a blast furnace tuyere air duct connection device includes a large tuyere sleeve 1, a middle tuyere sleeve 2, a small tuyere sleeve 3, a middle tuyere sleeve cooling water pipe 6, a small tuyere sleeve cooling water pipe 7, a flange 5, a furnace shell 4, an air duct 8 and a pressurizing elbow 821.

[0019] A connecting flange is provided between the large tuyere sleeve 1 and the furnace shell 4. The large tuyere sleeve 1 is connected to the furnace shell 4 through the flange 5. The flange 5 is connected to the furnace shell 4 by welding. The large tuyere sleeve 1 is connected to the middle tuyere sleeve 2 through a conical connection structure. The middle tuyere sleeve 2 is connected to the small tuyere sleeve 3 through a conical connection structure. The small tuyere sleeve 3 is connected to the air guide duct 8 through a conical connection structure.

[0020] The first end 811 of the air duct 8 and the second end 812 of the air duct 8 are both provided with bell mouths. The conical surface of the first end 811 of the air duct has the same curvature as the conical surface of the tuyere sleeve 3 , and the first end 811 of the air duct penetrates deep into the tuyere sleeve 3 .

[0021] The small tuyere sleeve 3 and the middle tuyere sleeve 2 are both provided with a cooling water inlet and a cooling water outlet. The front ends of the cooling water inlet and the cooling water outlet are both provided with internal threads, which are connected to water pipes provided with external threads.

[0022] The first end 811 of the air duct is connected to the steel pipe 831 by welding, the steel pipe is connected to the pressurizing elbow 821 by welding, the pressurizing elbow 821 is connected to the steel pipe 831 by welding, and the steel pipe is connected to the second end 812 of the air duct by welding.

[0023] The large tuyere sleeve 1 and the flange 5 are made of cast iron or cast steel, the middle tuyere sleeve 2 is made of cast copper-steel composite material, and the middle tuyere sleeve cooling water pipe 6 and the small tuyere sleeve cooling water pipe 7 are both made of No. 20 cold-drawn seamless pipe.

[0024] The furnace shell 4 is made of welded steel plate material, and the first end and the second end of the air guide pipe 8 are both made of welded steel plate material.

[0025] The pressure charging elbow 821 is a standard part, and the steel pipe 831 is made of welded steel pipe material.

[0026] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0027] 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 blast furnace tuyere air duct connection device, characterized in that: It includes a large tuyere sleeve, which is connected to the furnace shell through a flange, the large tuyere sleeve is connected to the middle tuyere sleeve through a conical connection structure, the middle tuyere sleeve is connected to the small tuyere sleeve through a conical connection structure, the small tuyere sleeve is connected to the air duct through a conical connection structure, and the first end and the second end of the air duct are both provided with bell mouths.

2. A blast furnace tuyere air duct connection device according to claim 1, characterized in that: The middle tuyere sleeve and the small tuyere sleeve are both provided with a cooling water inlet and a cooling water outlet.

3. A blast furnace tuyere air duct connection device according to claim 1, characterized in that: The first end and the second end of the air guide pipe are both welded with steel pipes, and the first end and the second end of the air guide pipe are both bell-shaped.

4. A blast furnace tuyere air duct connection device according to claim 3, characterized in that: Pressurized elbows are welded between the steel pipes.

5. A blast furnace tuyere air duct connection device according to claim 1, characterized in that: The conical surface of the bell mouth at the first end of the air guide pipe has the same curvature as the conical surface of the tuyere sleeve, and the bell mouth at the first end of the air guide pipe is deeply inserted into the tuyere sleeve.

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