Blowpipe of blast furnace air supply device

Abstract

The utility model relates to the technical field of smelting equipment, in particular to a belly pipe of a blast furnace air supply device. The device comprises a belly pipe, the belly pipe is composed of a bent pipe and a straight pipe, the straight pipe is provided with an oblique insertion type coal injection gun pipe opening, and the device is characterized in that the internal diameter phi 1 of the bent pipe is 270mm, the internal diameter phi 2 of the straight pipe and a bent pipe flange is 160mm, and the internal diameter phi 3 of the straight pipe is 175mm; and the angle alpha of an opening of the obliquely inserted coal injection gun on the straight pipe is 9.2 degrees. After transformation, high temperature is avoided, energy is saved, and production cost is reduced. The service life of the coal injection gun and the tuyere small sleeve is prolonged, the coal injection ratio is increased, and the pig iron cost is reduced. Labor intensity of workers is reduced, and finally long-life operation of the tuyere device is achieved. And 4, the average service life of the coal injection gun is prolonged from 10 days to more than 60 days by improving the angle of the oblique insertion type spray gun non-return hot air device on the straight pipe and the coal gun, and the average service life of the tuyere small sleeve is prolonged from 5-6 months to more than 8 months.

Description

Technical Field

[0001] The utility model relates to the technical field of smelting equipment, namely a direct blowing pipe of a blast furnace air supply device. Background Art

[0002] In the prior art, the blast furnace direct blowing pipe is one of the important equipment of the blast furnace air supply device. The blast furnace air supply device includes the upper section, middle section, lower section and tuyere direct blowing pipe of the tuyere. After the hot air comes out of the hot blast furnace, it reaches the hot blast surrounding pipe along the hot blast duct, and then enters the blast furnace through the upper section, middle section, lower section and tuyere direct blowing pipe of the tuyere. The direct blowing pipe is divided into two parts: a bend pipe and a straight pipe. There is an oblique plug-in spray gun equipped with a hot air reversal device on the straight pipe. Through long-term production practice, it is found that the previous design of the blast furnace direct blowing pipe has certain defects: 1. The temperature of the original bend pipe, the original direct blowing pipe and the flange of the bend pipe is often high (production for a period of time, the temperature ≧300℃) and it happens from time to time. When it exceeds 300℃, nitrogen cooling needs to be added to the outside of the direct blowing pipe, which not only causes energy waste, but also has the hidden danger of burning through. 2. The angle of the reverse hot air reversal device of the oblique plug-in spray gun on the straight pipe is a little large, which shortens the service life of the coal injection gun, frequently replaces it, increases the labor intensity of workers, and increases the cost of ironmaking. 3. The original coal spray gun had problems such as insufficient insertion depth, inappropriate position and angle, etc. The coal powder not only easily abraded the air inlet and caused damage to the air inlet sleeve, but also reduced the combustion effect of the coal powder. Utility Model Content

[0003] The utility model aims to provide a blast furnace air supply device direct blowing pipe with good use effect and long service life in view of the above-mentioned shortcomings.

[0004] The technical scheme of the utility model is: a direct blowing pipe of a blast furnace air supply device, comprising a direct blowing pipe, the direct blowing pipe is composed of a bent pipe and a straight pipe, an obliquely inserted coal injection gun barrel mouth is arranged on the straight pipe, and the utility model is characterized in that the inner diameter of the bent pipe is φ1=270 mm, the inner diameter of the straight pipe and the bent pipe flange is φ2=160 mm, and the inner diameter of the straight pipe is φ3=175 mm; the angle of the obliquely inserted coal injection gun barrel mouth on the straight pipe is α=9.2 degrees.

[0005] The coal injection gun has an outer diameter of 27 mm, a wall thickness of 4 mm, an inner diameter of a coal injection gun valve of φ4=20 mm, and a length of 2.4 meters.

[0006] The advantages of the utility model are: 1. After the transformation, high temperature is avoided, energy is saved, and production costs are reduced. 2. The service life of the coal injection gun and the tuyere sleeve is increased, which not only increases the coal injection ratio but also reduces the cost of pig iron. 3. The labor intensity of the workers is reduced, and the long-life operation of the tuyere device is finally achieved. 4. Through the angle improvement of the oblique-insertion-type spray gun backstop hot air device on the straight pipe and the improvement of the coal gun, the average service life of the coal injection gun is increased from 10 days to more than 60 days, and the average service life of the tuyere sleeve is increased from 5-6 months to more than 8 months.

[0007] The embodiments of the present invention will be described in further detail below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is a simplified structural diagram of the utility model.

[0009] Figure 2 It is a schematic diagram of the straight pipe structure in the utility model.

[0010] Figure 3 This is a simplified diagram of the coal injection gun structure. DETAILED DESCRIPTION

[0011] See also Figure 1 -3, the names of the parts are as follows: straight pipe 1, bent pipe 2, oblique-insertion coal injection gun barrel 3, bent pipe flange 4, coal injection gun 5, straight pipe flange 6.

[0012] See also Figure 1 The direct blowing pipe of the blast furnace air supply device comprises a direct blowing pipe, and the direct blowing pipe consists of a straight pipe 1 and a bent pipe 2.

[0013] See also Figure 2 , there is an obliquely inserted coal injection gun nozzle 3 on the straight pipe 1. Figure 1 and Figure 2 Connected by straight pipe flange 6. After field research, the transformation was carried out as follows: the original inner diameter φ1 of the elbow 2 was changed from 300mm to 270mm (see Figure 1 ), the original straight pipe 1 and the inner diameter φ2 of the elbow flange 4 was changed from 180mm to 160mm, and the inner diameter φ3 of the straight pipe 1 was changed from 195mm to 175 mm (increasing the thickness of the refractory layer of the straight blow pipe). The angle α of the oblique-inserted coal-injection gun tube mouth of the oblique-inserted gun backstop hot air device on the straight pipe 1 was changed from 10.8 degrees to 9.2 degrees. Before the angle was changed, the angle α was slightly larger, which caused the waterman to frequently adjust the angle of the coal gun when inserting the coal gun to prevent the coal powder in the coal gun from wearing the small air inlet sleeve, which wasted time and increased the labor intensity of the workers. After the angle α was changed to 9.2 degrees, the above shortcomings were basically avoided.

[0014] See also Figure 3 The outer diameter of the coal injection gun 5 was changed from 22mm×3 to 27mm×4 (wall thickness is 4 mm), and the inner diameter of the coal injection gun valve φ4 was changed from 18mm to 20mm. Before the transformation, the length of the original coal injection gun 5 was 2.2 meters, and the air inlet small sleeve was 150cm-200cm (the air inlet small sleeve was installed in Figure 2At the right end of the middle straight pipe 1 (picture omitted), the length of the coal injection gun after the transformation is 2.4 meters, and the air inlet small sleeve is 350cm-400cm, which effectively prevents the coal injection gun from wearing the small sleeve and increases the service life of the air inlet small sleeve and coal injection gun. After the coal gun is improved, the coal injection amount of a single coal gun is increased to create conditions for improving the coal ratio in blast furnace operation, and the frequency of coal gun replacement is reduced, reducing the labor intensity of workers.

[0015] The above description is only a specific implementation of the present utility model, and various examples do not constitute a limitation on the essential content of the present utility model.

Claims

1. A blast furnace air supply device direct blowing pipe, comprising a direct blowing pipe, the direct blowing pipe comprising a straight pipe (1) and a curved pipe (2), the straight pipe (1) having an obliquely inserted coal injection gun nozzle (3), characterized in that The inner diameter of the curved pipe (2) is φ1=270 mm, the inner diameter of the straight pipe (1) and the curved pipe flange (4) is φ2=160 mm, and the inner diameter of the straight pipe (1) is φ3=175 mm; the angle of the obliquely inserted coal injection gun on the straight pipe (1) is α=9.2 degrees.

2. The blast furnace air supply device direct blowing pipe according to claim 1, characterized in that The outer diameter of the coal injection gun (5) is 27 mm, the wall thickness is 4 mm, the inner diameter of the coal injection gun valve is φ4=20 mm, and the length of the coal injection gun (5) is 2.4 meters.

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