Blowpipe for air supply device of iron-making blast furnace

Abstract

The utility model relates to the technical field of blast furnace ironmaking, and discloses a belly pipe for an ironmaking blast furnace air supply device, which comprises a belly pipe body and a coal injection gun arranged on the belly pipe body, a flange is arranged at one end of the belly pipe body, and a cooling cavity is arranged at one end of the belly pipe body far away from the flange. A water inlet cavity is formed in the end, close to the flange, of the straight air pipe body, a plurality of circulation channels are formed in the side, close to the water inlet cavity, of the cooling cavity, and the other ends of the circulation channels communicate with the water inlet cavity. The outer wall of the end, close to the cooling cavity, of the straight air pipe body is fixedly connected with a water outlet pipe communicating with the cooling cavity. According to the belly pipe for the air supply device of the iron-making blast furnace, cooling water is injected into the cooling cavity through the water inlet pipe and then flows out of the cooling cavity through the water outlet pipe, so that a flowing channel is formed, the cooling effect of the belly pipe is improved, and the heated damage rate of the belly pipe is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of blast furnace ironmaking, in particular to a direct blowing pipe used for an air supply device of an ironmaking blast furnace. Background Art

[0002] An ironmaking blast furnace is a device for processing iron ore, melting iron ore into molten iron at high temperatures. The blast furnace air supply device is a connector installed between the blast furnace hot air surrounding pipe and the blast furnace tuyere. It is used to send hot air above 1400℃ into the blast furnace through the tuyere device. At the same time, the direct-blowing pipe coal injection gun of the blast furnace air supply device directly sprays coal powder into the blast furnace to replace the coke to provide heat and reduction, thereby reducing the coke ratio, reducing the cost of ironmaking, and improving the competitiveness of the product. Common direct-blowing pipe coal injection guns are divided into two types: oblique insertion type and direct insertion type. When in use, the coal powder is sprayed from the outlet end of the direct-blowing pipe through the coal injection gun, and ignited in conjunction with the high-temperature airflow entering the straight air duct, thereby providing high-temperature combustion. However, in this process, the outlet end of the straight air duct and even the entire pipe body will be affected by the high temperature, which is prone to deformation and burn-through, posing a greater safety hazard.

[0003] For example, the patent with publication number CN215668071U discloses a direct blowing pipe for an air supply device of an iron-making blast furnace, comprising a direct blowing pipe body, a gas storage sleeve is arranged near a connection on the direct blowing pipe body, a charging mechanism is arranged on the outer side of the gas storage sleeve, a gas storage cavity is arranged in the gas storage sleeve, a heat insulation cavity is arranged on the direct blowing pipe body, fixing strips are arranged on both sides of the surface of the heat insulation cavity, a connecting block is arranged between the fixing strips, a through groove is arranged between the gas storage cavity and the heat insulation cavity, a first return spring is arranged on the gas storage sleeve on the surface of the gas storage cavity, a blocking block is arranged at one end of the first return spring, a receiving groove is arranged near the through groove between the gas storage sleeve and the direct blowing pipe body, an ejection assembly with an adjustment function is arranged on the receiving groove, and the heat insulation cavity is opened on the direct blowing pipe body. The connection between the fixing strip and the connecting block ensures the strength of the direct blowing pipe body, and the gas storage sleeve inputs cold air to cool the direct blowing pipe body, thereby ensuring the service life of the direct blowing pipe.

[0004] However, the direct blowing pipe in the above technology still has the following problems:

[0005] Although the connection of the straight air duct is cooled to reduce high-temperature damage, the air outlet of the straight air duct is directly heated and has a high temperature. It is also very easy to cause high-temperature deformation, burn-through and other problems, causing damage to the straight air duct. Utility Model Content

[0006] In view of the deficiencies in the prior art, the utility model provides a straight blowing pipe for an air supply device of an iron-making blast furnace, such as: a cooling channel is set in the straight air pipe, and cooling water is used to cool the straight air pipe body through the cooling channel, thereby reducing the heat degree of the straight air pipe and thus reducing the damage rate of the straight air pipe.

[0007] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a straight blowing pipe for an air supply device of an iron-making blast furnace, comprising a straight blowing pipe body and a coal injection gun installed on the straight blowing pipe body, a flange being installed at one end of the straight blowing pipe body, a cooling chamber being provided at the end of the straight blowing pipe body away from the flange, a water inlet chamber being provided at the end of the straight blowing pipe body close to the flange, a plurality of flow channels being provided on the side of the cooling chamber close to the water inlet chamber, the other ends of the plurality of flow channels being connected to the water inlet chamber, a water inlet pipe connected to the water inlet chamber being fixedly connected to the outer wall of the straight blowing pipe body close to the water inlet chamber, and a water outlet pipe connected to the cooling chamber being fixedly connected to the outer wall of the straight blowing pipe body close to the cooling chamber.

[0008] Furthermore, the water inlet pipe is located at the highest end of the water inlet cavity, and the water outlet pipe is located at the lowest end of the cooling cavity.

[0009] Furthermore, a pressure relief valve is fixedly connected to the outer wall of the straight air duct body, and the pressure relief valve is communicated with the cooling chamber.

[0010] Furthermore, the pressure relief valve is located at the top of the cooling chamber.

[0011] Furthermore, the plurality of flow channels are evenly distributed toward both sides along the coal injection gun as the center.

[0012] Furthermore, one end of the water outlet pipe away from the straight air duct body is fixedly connected to and communicated with an air defense water pipe.

[0013] Furthermore, a pipe clamping block is fixedly connected to the outer wall of the straight air duct body, and the inner wall of the pipe clamping block is slidably connected to the outer wall of the air defense water pipe.

[0014] Furthermore, the height of the tube clamping block is not lower than the top of the cooling chamber.

[0015] Compared with the prior art, the utility model has the following beneficial effects:

[0016] The straight blowing pipe used in the air supply device of the iron-making blast furnace injects cooling water into the water inlet cavity through the water inlet pipe, and then the cooling water enters the cooling cavity through the circulation channel, so as to cool the heated end of the straight air pipe. At the same time, the cooling water flows out of the cooling cavity through the water outlet pipe, so as to form a flow channel, improve the cooling effect of the straight air pipe, and reduce the heat damage rate of the straight air pipe. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is a schematic diagram of the overall appearance connection structure of the utility model;

[0018] Figure 2 It is a cross-sectional schematic diagram of a part of the connection structure of the utility model;

[0019] Figure 3 Based on Figure 1 A schematic cross-sectional view of the connection structure from another angle.

[0020] In the figure: 1. straight air duct body; 2. coal injection gun; 3. water inlet pipe; 4. water outlet pipe; 5. pressure relief valve; 11. flange; 12. pipe clamp block; 41. air defense water pipe; 101. cooling chamber; 102. water inlet chamber; 103. circulation channel. DETAILED DESCRIPTION

[0021] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0022] See also Figure 1 - Figure 3 A straight blowing pipe for an air supply device of an iron-making blast furnace comprises a straight blowing pipe body 1 and a coal injection gun 2 installed on the straight blowing pipe body 1, a flange 11 is installed at one end of the straight blowing pipe body 1, a cooling chamber 101 is provided at the end of the straight blowing pipe body 1 away from the flange 11, a water inlet chamber 102 is provided at the end of the straight blowing pipe body 1 close to the flange 11, a plurality of flow channels 103 are provided on the side of the cooling chamber 101 close to the water inlet chamber 102, the other ends of the plurality of flow channels 103 are all connected to the water inlet chamber 102, a water inlet pipe 3 connected to the water inlet chamber 102 is fixedly connected to the outer wall of the straight blowing pipe body 1 close to the water inlet chamber 102, and a water outlet pipe 4 connected to the cooling chamber 101 is fixedly connected to the outer wall of the straight blowing pipe body 1 close to the cooling chamber 101.

[0023] like Figure 1 - Figure 3 As shown, the direct blowing pipe for the air supply device of an iron-making blast furnace in the utility model is similar to the structure of the direct blowing pipe for the air supply device of an iron-making blast furnace in the prior art, such as the direct blowing pipe for the air supply device of an iron-making blast furnace disclosed in the patent with publication number CN215668071U. The main improvement of the utility model is that the direct blowing pipe body 1 can be actively cooled, the damage caused by the heat to the direct blowing pipe body 1 can be reduced, and the service life of the direct blowing pipe body 1 can be increased. Figures 1 to 3 As shown, when the straight blowing pipe for the air supply device of an iron-making blast furnace in the utility model is in use, the external water pipe is connected to the water inlet pipe 3, and cooling water is injected into the water inlet cavity 102 through the water inlet pipe 3. Subsequently, the cooling water flows into the circulation channel 103 through the water inlet cavity 102, and then flows into the cooling cavity 101 through the circulation channel 103, thereby cooling the entire straight air pipe body 1, and finally the cooling water flows out of the straight air pipe body 1 from the water outlet pipe 4, wherein the cooling water can also be replaced by coolant to further improve the cooling effect.

[0024] like Figure 1 - Figure 3As shown, the water inlet pipe 3 is located at the highest end of the water inlet cavity 102, and the water outlet pipe 4 is located at the lowest end of the cooling cavity 101. The water inlet pipe 3 is arranged at a high position to facilitate the injection of cooling water, and the water outlet pipe 4 is arranged at a low position to facilitate cleaning, and the cooling water can be cleaned from the cooling cavity 101.

[0025] like Figure 1 - Figure 3 As shown, the outer wall of the straight air duct body 1 is fixedly connected with a pressure relief valve 5, and the pressure relief valve 5 is connected with the cooling chamber 101. When the cooling water flows in the cooling chamber 101, a certain amount of steam gas will be generated with the continuous heat absorption and cooling. At this time, the steam gas can be discharged from the cooling chamber 101 through the pressure relief valve 5 to avoid a large amount of gas accumulation affecting the cooling effect.

[0026] like Figure 1 - Figure 3 As shown, the pressure relief valve 5 is located at the top of the cooling chamber 101. The pressure relief valve 5 is arranged at the top of the cooling chamber 101, so that the steam gas rises, gathers at the position of the pressure relief valve 5 and is discharged from the cooling chamber 101 through the pressure relief valve 5.

[0027] like Figure 1 - Figure 3 As shown, the plurality of flow channels 103 are evenly distributed on both sides along the coal injection gun 2. The evenly distributed flow channels 103 can further cool the entire straight air duct body 1, thereby improving the overall cooling effect of the straight air duct body 1.

[0028] like Figure 1 - Figure 3 As shown, the end of the water outlet pipe 4 away from the straight air duct body 1 is fixedly connected and communicated with an air defense water pipe 41. When the water inlet pipe 3 is suddenly cut off, the air defense water pipe 41 can prevent the cooling water from flowing out of the water outlet pipe 4, ensuring that there is a certain amount of cooling water in the cooling chamber 101, thereby preventing the cooling water in the cooling chamber 101 from being left empty and causing the straight air duct body 1 to be cooled without cooling water.

[0029] like Figure 1 - Figure 3 As shown, the outer wall of the straight air duct body 1 is fixedly connected with a pipe clamping block 12, and the inner wall of the pipe clamping block 12 is slidably connected with the outer wall of the air defense water pipe 41. The pipe clamping block 12 is provided to facilitate the installation and fixation of the air defense water pipe 41.

[0030] like Figure 1 - Figure 3 As shown, the height of the clamp block 12 is not lower than the top of the cooling chamber 101. By arranging the clamp block 12 at a position higher than the cooling chamber 101, it is ensured that the cooling water in the air defense water pipe 41 can always fill the entire cooling chamber 101, thereby improving the cooling effect of the cooling chamber 101.

[0031] 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 straight blowing pipe for an air supply device of an ironmaking blast furnace, comprising a straight blowing pipe body (1) and a coal injection gun (2) mounted on the straight blowing pipe body (1), wherein a flange (11) is mounted on one end of the straight blowing pipe body (1), and characterized in that: The end of the straight air duct body (1) away from the flange (11) is provided with a cooling chamber (101), the end of the straight air duct body (1) close to the flange (11) is provided with a water inlet chamber (102), a side of the cooling chamber (101) close to the water inlet chamber (102) is provided with a plurality of circulation channels (103), the other ends of the plurality of circulation channels (103) are all connected to the water inlet chamber (102), the outer wall of the end of the straight air duct body (1) close to the water inlet chamber (102) is fixedly connected to a water inlet pipe (3) connected to the water inlet chamber (102), and the outer wall of the end of the straight air duct body (1) close to the cooling chamber (101) is fixedly connected to a water outlet pipe (4) connected to the cooling chamber (101).

2. The direct blowing pipe for an air supply device of an ironmaking blast furnace according to claim 1, characterized in that: The water inlet pipe (3) is located at the highest end of the water inlet chamber (102), and the water outlet pipe (4) is located at the lowest end of the cooling chamber (101).

3. A direct blowing pipe for an ironmaking blast furnace air supply device according to claim 1 or 2, characterized in that: A pressure relief valve (5) is fixedly connected to the outer wall of the straight air duct body (1), and the pressure relief valve (5) is in communication with the cooling chamber (101).

4. The direct blowing pipe for an air supply device of an ironmaking blast furnace according to claim 3, characterized in that: The pressure relief valve (5) is located at the top of the cooling chamber (101).

5. A direct blowing pipe for an air supply device of an ironmaking blast furnace according to claim 1, 2 or 4, characterized in that: The plurality of flow channels (103) are evenly distributed toward both sides along the coal injection gun (2) as the center.

6. A direct blowing pipe for an air supply device of an ironmaking blast furnace according to claim 1, 2 or 4, characterized in that: One end of the water outlet pipe (4) away from the straight air duct body (1) is fixedly connected to and communicated with an air defense water pipe (41).

7. A direct blowing pipe for an air supply device of an ironmaking blast furnace according to claim 6, characterized in that: The outer wall of the straight air duct body (1) is fixedly connected to a pipe clamping block (12), and the inner wall of the pipe clamping block (12) is slidably connected to the outer wall of the air defense water pipe (41).

8. The direct blowing pipe for the air supply device of an iron-making blast furnace according to claim 7, characterized in that: The height of the tube clamping block (12) is not lower than the top of the cooling chamber (101).

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