Self-connection high-temperature-resistant coating oxygen blowing pipe and oxygen blowing structure for smelting blast furnace

Abstract

The oxygen lance comprises an oxygen lance body, the oxygen lance body comprises a first end section, a second end section and a middle section, the first end section, the middle section and the second end section are sequentially and integrally formed, the inner side face of the first end section is a first conical face, and the inner side face of the second end section is a second conical face. The outer side face of the second end section is a second conical face capable of being matched and inserted with the inner side face of the first end section, the outer side of the middle section is coated with a high-temperature-resistant coating, the two ends of the oxygen lance body are designed to be an inner conical face and an outer conical face which can be matched and inserted with each other, and self-connection of the oxygen lance is achieved in a conical face matched connection mode. The defects that traditional welding consumes manpower and time and is prone to air leakage are overcome, the remaining parts of all the oxygen blowing pipes can be continuously and effectively connected together for continuous use in a self-connection mode, zero waste is achieved, and the utilization rate is increased.

Description

Technical Field

[0001] The utility model relates to the field of oxygen blowing for smelting blast furnaces, in particular to a self-connected high-temperature resistant coating oxygen blowing pipe and an oxygen blowing structure for smelting blast furnaces. Background Art

[0002] my country is a major steel producer in the world, with nearly 10,000 blast furnaces in various domestic steel plants. The iron mouth, iron ditch and ladle dialysis bricks of smelting blast furnaces need oxygen for blowing during the production process, and oxygen blowing pipes are needed to transport oxygen during this process. Due to the high temperature of the iron mouth, iron ditch and ladle of smelting blast furnaces, the temperature reaches more than 1400 degrees Celsius. Due to the high temperature, when blowing oxygen, the operator needs to weld two 6-meter-long ordinary oxygen blowing pipes together. At present, most domestic steel smelting enterprises use the original oxygen blowing pipe, that is, ordinary welding pipe, for the above production operation to achieve long-distance blowing and avoid high-temperature burning. This method has the defects of low manual operation efficiency, high labor intensity, and easy leakage and tempering at the connection. In addition, ordinary oxygen blowing pipes transport high-purity oxygen in a high-temperature environment, and the oxygen blowing pipe body will also accelerate the combustion loss, increase production costs and labor intensity of workers. When the length is insufficient and the high-temperature burning can only be used to throw away the remaining part of the oxygen blowing pipe, the remaining part cannot be reused, causing unnecessary waste, resulting in a reduction in the service life of the oxygen blowing pipe, which is not conducive to controlling the production cost of the steel industry. Utility Model Content

[0003] In view of the above-mentioned problems, the utility model proposes a self-connecting high-temperature resistant coated oxygen blowing pipe and an oxygen blowing structure for a smelting blast furnace, which not only solves the defects of traditional welding that is labor-intensive, time-consuming and prone to air leakage, but also can continuously and effectively connect the remaining parts of each oxygen blowing pipe together for continued use through self-connection, thereby achieving zero waste and improving utilization rate.

[0004] To achieve the above purpose, the utility model is implemented according to the following technical solutions:

[0005] A self-connecting high-temperature resistant coated oxygen duct comprises an oxygen duct body, wherein the oxygen duct body comprises a first end section, a second end section and a middle section, wherein the first end section, the middle section and the second end section are integrally formed in sequence, wherein the inner side surface of the first end section is a first conical surface, and the outer side surface of the second end section is a second conical surface that can be matched and plugged with the inner side surface of the first end section, and the outer side of the middle section is coated with a high-temperature resistant coating.

[0006] In one technical solution, the taper of the first conical surface and the second conical surface are both 3°.

[0007] In a technical solution, the length of the oxygen blowing tube body is 6000 mm, the length of the first end section is 50 to 70 mm, and the length of the second end section is 70 mm to 90 mm.

[0008] In one technical solution, the middle section is a straight pipe section.

[0009] In one technical solution, the thickness of the high temperature resistant coating is 5 to 20 mm.

[0010] An oxygen blowing structure for a smelting blast furnace comprises two self-connecting high temperature resistant coating oxygen blowing pipes as described above, wherein the second cone surface of one self-connecting high temperature resistant coating oxygen blowing pipe is plugged into the first cone surface of the other self-connecting high temperature resistant coating oxygen blowing pipe.

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

[0012] The utility model designs the two ends of the oxygen blowing pipe body as inner cone and outer cone that can be matched and plugged into each other, realizes self-connection of the oxygen blowing pipe through the cone matching connection mode, realizes self-connection quickly in 1 second, and the connection is tight without air leakage, and the connection strength is safe and reliable; the welding connection mode of the traditional oxygen blowing pipe is cancelled, and the defects of the traditional welding that is labor-consuming, time-consuming and easy to leak are overcome. In addition, the self-connection mode can effectively connect the remaining parts of each oxygen blowing pipe together for continued use, so as to achieve zero waste and improve utilization rate; a layer of high temperature resistant material is coated on the outer surface of the oxygen blowing pipe, which can increase the service life of the oxygen blowing pipe itself in the production process, reduce consumption, reduce the production cost of the steel industry, and provide an efficient, energy-saving and safe solution for the oxygen blowing structure of the smelting blast furnace. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0014] Figure 1 It is a structural diagram of the radial section of the utility model.

[0015] Figure numerals: 1 - first end section; 2 - middle section; 3 - second end section; 4 - high temperature resistant coating. DETAILED DESCRIPTION

[0016] In order to make the purpose, technical solutions and advantages of the embodiments of the utility model clearer, the technical solutions in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments.

[0017] Example 1

[0018] Embodiment 1 of the present utility model proposes a self-connecting high temperature resistant coating oxygen blowing tube, such as Figure 1 As shown, the oxygen blowing tube body includes a first end section 1, a second end section 3 and a middle section 2, wherein the first end section 1, the middle section 2 and the second end section 3 are integrally formed in sequence, the inner side surface of the first end section 1 is a first conical surface, the outer side surface of the second end section 3 is a second conical surface that can be matched and plugged with the inner side surface of the first end section 1, and the outer side of the middle section 2 is coated with a high temperature resistant coating 4

[0019] During actual production, the oxygen blowing pipe body is made of seamless steel pipe, and the two ends of the seamless steel pipe are punched by hydraulic forging equipment and molds. The inner side surface of one end, namely the first end section 1, is punched into an inner cone surface of the expanded hole, namely the first cone surface, and the other end, namely the second end section 3, is punched into an outer cone surface of the shrinkage hole, and the outer cone surface can be matched and plugged with the first cone surface, namely the second cone surface; a high-temperature resistant coating 4 is coated on the outer side of the middle section 2, and then the coated oxygen blowing pipes are neatly placed on the drying kiln tube rack one by one for high-temperature firing and drying, so as to obtain the self-connecting high-temperature resistant coated oxygen blowing pipe of the utility model.

[0020] The utility model designs the two ends of the oxygen blowing pipe body as inner cone and outer cone that can be matched and plugged into each other, realizes self-connection of the oxygen blowing pipe through the cone matching connection mode, realizes self-connection quickly in 1 second, and the connection is tight without air leakage, and the connection strength is safe and reliable; the welding connection mode of the traditional oxygen blowing pipe is cancelled, and the defects of the traditional welding that is labor-consuming, time-consuming and easy to leak are overcome. In addition, the self-connection mode can effectively connect the remaining parts of each oxygen blowing pipe together for continued use, so as to achieve zero waste and improve utilization rate; a layer of high temperature resistant material is coated on the outer surface of the oxygen blowing pipe, which can increase the service life of the oxygen blowing pipe itself in the production process, reduce consumption, reduce the production cost of the steel industry, and provide an efficient, energy-saving and safe solution for the oxygen blowing structure of the smelting blast furnace.

[0021] Preferably, in this embodiment, the taper of the first conical surface and the second conical surface are both 3°, the length of the oxygen blowing tube body is 6000 mm, the length of the first end section 1 is 60 mm, the length of the second end section 3 is 80 mm, the middle section 2 is a straight pipe section, and the thickness of the high temperature resistant coating 4 is 10 mm.

[0022] Example 2

[0023] Example 2 of the utility model proposes an oxygen blowing structure for a smelting blast furnace, including the self-connecting high-temperature resistant coating oxygen blowing pipe of Example 1, wherein the second cone surface of one self-connecting high-temperature resistant coating oxygen blowing pipe is plugged into the first cone surface of another self-connecting high-temperature resistant coating oxygen blowing pipe, and when in use, it can be installed and blown in accordance with the conventional oxygen blowing structure and oxygen gun.

[0024] Test example

[0025] A comparative experiment was conducted in the company using an oxygen blowing structure for a smelting blast furnace in Example 2 and a traditional welded oxygen blowing pipe. The experimental results show that:

[0026] Connection speed: The self-connection method in Example 2 is fast and safe, and the connection is completed in 1 second; the traditional oxygen lance welding takes 5 minutes;

[0027] Ablation speed: The oxygen blowing structure for a smelting blast furnace in Example 2 ablated 0.6 meters in 10 minutes; the traditional oxygen blowing tube ablated 8.3 meters in 10 minutes.

[0028] The experimental results clearly show the advantages of the oxygen blowing structure for a smelting blast furnace of the utility model, which has the characteristics of fast connection speed, safety and firmness, low labor intensity, small loss, energy saving and consumption reduction.

[0029] In addition, the products were compared in actual use at the production site of the customer unit, and it was once again verified from actual production use that the oxygen blowing structure for smelting blast furnaces obtained by the technical solution of the utility model solves the problems of traditional welded oxygen blowing pipes that are labor-intensive, time-consuming, prone to air leakage, and high loss, thereby reducing production costs.

[0030] The above is only a preferred specific implementation of the utility model, but the protection scope of the utility model is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed by the utility model should be included in the protection scope of the utility model. Therefore, the protection scope of the utility model should be based on the protection scope of the claims.

Claims

1. A self-connecting high temperature resistant coating oxygen blowing tube, comprising an oxygen blowing tube body, characterized in that: The oxygen blowing tube body comprises a first end section (1), a second end section (3) and a middle section (2); the first end section (1), the middle section (2) and the second end section (3) are integrally formed in sequence; the inner side surface of the first end section (1) is a first conical surface; the outer side surface of the second end section (3) is a second conical surface that can be matched and plugged with the inner side surface of the first end section (1); and the outer side of the middle section (2) is coated with a high temperature resistant coating (4).

2. The self-connecting high temperature resistant coating oxygen blowing tube according to claim 1 is characterized in that: The taper of the first tapered surface and the second tapered surface are both 3°.

3. The self-connecting high temperature resistant coating oxygen blowing tube according to claim 2 is characterized in that: The oxygen blowing tube body is 6000 mm long, the first end section (1) is 50 to 70 mm long, and the second end section (3) is 70 to 90 mm long.

4. The self-connecting high temperature resistant coating oxygen blowing tube according to claim 3 is characterized in that: The middle section (2) is a straight pipe section.

5. The self-connecting high temperature resistant coating oxygen blowing tube according to claim 4 is characterized in that: The thickness of the high temperature resistant coating (4) is 5 to 20 mm.

6. An oxygen blowing structure for a smelting blast furnace, characterized in that: It comprises two self-connecting high-temperature resistant coating oxygen blowing pipes as described in any one of claims 1-5, wherein the second cone surface of one self-connecting high-temperature resistant coating oxygen blowing pipe is plugged into and matched with the first cone surface of the other self-connecting high-temperature resistant coating oxygen blowing pipe.

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