A device and method for treating coal gas leakage from the iron mouth of a blast furnace

Abstract

The present invention relates to a device and method for treating gas leakage from the iron mouth of a blast furnace, and belongs to the technical field of blast furnace ironmaking production in the metallurgical industry. The technical scheme is as follows: a protective plate (5) is provided at the iron mouth of the blast furnace, an elliptical hole (11) is provided on the protective plate (5), and a pre-buried bracket (4) is fixed on the protective plate (5); a gas collecting pipe (2) is fixed to the upper half of the elliptical hole (11), a through-length notch (12) is provided on the pipe wall of the gas collecting pipe (2), and both ends of the gas collecting pipe (2) are respectively connected to a gas outlet pipe (1), and the gas outlet pipe (1) is fixed on the protective plate (5) in a vertical state; a mud sleeve (8) is casted on the protective plate (5) using a casting material. The beneficial effects of the present invention are: it can avoid the mud bubbling caused by the gas leaking from the high-pressure iron mouth area, which reduces the strength of the mud sleeve and causes mud to leak when plugging the mouth, prolonging the service life of the mud sleeve, while also reducing the iron mouth splashing, and improving the safety of blast furnace iron tapping.

Description

Technical Field

[0001] The invention relates to a device and a method for treating coal gas leakage from a blast furnace iron mouth, and belongs to the technical field of blast furnace ironmaking production in the metallurgical industry. Background Art

[0002] When the blast furnace is opened after the overhaul, there is a common phenomenon of gas leakage in the iron mouth area, which will affect the safe and orderly production of the blast furnace in serious cases. First, when the iron mouth is opened, the high-pressure gas will leak out from the iron mouth, causing the molten iron to splash when tapping, and then the condensed slag iron crust will form on both sides of the main iron groove, increasing the labor intensity of the employees, and even causing the iron mouth to fail to be blocked, the mud gun to burn, the wind blocking the mouth and other malignant accidents; second, the leakage of high-pressure gas will reduce the strength of the iron mouth mud sleeve, especially when the new mud sleeve is made, the internal structure of the mud sleeve at the location of gas leakage is loose or there is a material-free area, the overall strength of the mud sleeve deteriorates, and cracks appear in the mud sleeve. In normal use, the thickness of the mud sleeve will rapidly become thinner in a short time with the erosion of slag iron. When the wind is blocked, the mud pressure will increase, which is easy to damage the mud sleeve and mud will leak out of the iron mouth, seriously threatening the safe and stable production of the blast furnace; third, the blast furnace gas will overflow to the iron-casting platform, which is prone to gas poisoning accidents among the workers on the iron-casting platform. Summary of the invention

[0003] The purpose of the present invention is to provide a device and method for controlling coal gas leakage from the iron mouth of a blast furnace, which can prevent the coal gas leakage from the high-pressure iron mouth area from reducing the strength of the mud sleeve, prolong the service life of the mud sleeve, and also reduce the iron mouth splashing, thereby solving the problems existing in the background technology.

[0004] The technical solution of the present invention is:

[0005] A device for controlling gas leakage from the iron mouth of a blast furnace comprises a gas outlet pipe, a gas collecting pipe, an anchor hook, an embedded bracket, a protective plate, an iron mouth channel, a mud sleeve, an elliptical hole and a notch. A protective plate is provided at the iron mouth of the blast furnace, and an elliptical hole concentric with the iron mouth channel is provided on the protective plate. The embedded bracket is fixed on the protective plate, and an anchor hook is provided on the embedded bracket. The gas collecting pipe is arc-shaped, and the arc of the gas collecting pipe matches the upper half of the elliptical hole. The gas collecting pipe is fixed to the upper half of the elliptical hole. A through-length notch is provided on the pipe wall of the gas collecting pipe. Both ends of the gas collecting pipe are respectively connected to the gas outlet pipe, and the gas outlet pipe is fixed on the protective plate in a vertical state. The mud sleeve is cast on the protective plate using a casting material.

[0006] In the above-mentioned device for treating coal gas leakage from the iron mouth of a blast furnace, the embedded bracket is a mesh structure welded from threaded steel bars.

[0007] In the above-mentioned device for controlling coal gas leakage from the iron mouth of a blast furnace, the embedded bracket is fixed on the protective plate on both sides and the upper side of the elliptical hole.

[0008] In the above-mentioned device for controlling coal gas leakage from the iron mouth of a blast furnace, the long axis of the elliptical hole on the protection plate which is concentric with the iron mouth passage is in the vertical direction, and the short axis is in the horizontal direction.

[0009] In the above-mentioned device for treating coal gas leakage from the iron mouth of a blast furnace, the protective plate is fixed on the shell of the blast furnace.

[0010] A method for treating coal gas leakage from the iron mouth of a blast furnace comprises the following steps:

[0011] ① A protective plate is provided at the iron mouth of the blast furnace, and an elliptical hole concentric with the iron mouth channel is provided on the protective plate;

[0012] ②Fix the embedded bracket on the protective plate above the elliptical hole, and fix the anchor hook on the embedded bracket;

[0013] ③ A gas collecting pipe is fixed on the upper half of the elliptical hole, wherein the gas collecting pipe is arc-shaped, the arc of the gas collecting pipe matches the upper half of the elliptical hole, and a through-length notch is provided on the pipe wall of the gas collecting pipe;

[0014] ④ Connect the two ends of the gas collection pipe to a gas outlet pipe respectively, and the gas outlet pipe is fixed on the protection plate in a vertical state;

[0015] ⑤ Use casting material to cast the mud sleeve on the protection plate;

[0016] ⑥ After the coal gas escaping from the iron mouth area of ​​the blast furnace enters the gas collecting pipe, it is drained to the outside of the iron mouth area through the gas outlet pipes connected to both ends of the gas collecting pipe and ignited.

[0017] In the above-mentioned method for controlling coal gas leakage from the iron mouth of a blast furnace, the long axis of the elliptical hole on the protection plate which is concentric with the iron mouth passage is in the vertical direction, and the short axis is in the horizontal direction.

[0018] In the above-mentioned method for controlling coal gas leakage from the iron mouth of a blast furnace, the embedded bracket is a mesh structure welded from threaded steel bars.

[0019] In the above-mentioned method for controlling coal gas leakage from the iron mouth of a blast furnace, the castable of the casting mud sleeve is made of Al2O3-C-SiC material, and the water addition ratio is 3.5-5%.

[0020] The beneficial effect of the present invention is that after the coal gas escaping from the iron mouth area of ​​the blast furnace enters the coal gas collecting pipe, it is drained to the outside of the iron mouth area through the coal gas outlet pipes connected to the two ends of the coal gas collecting pipe and ignited, thereby avoiding the coal gas escaping from the high-pressure iron mouth area from reducing the strength of the mud sleeve and causing mud to leak out during plugging, thereby extending the service life of the mud sleeve, and also reducing the iron mouth splashing, thereby improving the safety of blast furnace iron tapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1It is a schematic diagram of the structure of the present invention;

[0022] Figure 2 for Figure 1 AA section view;

[0023] Figure 3 This is the main view of the connection between the gas outlet pipe and the gas collecting pipe;

[0024] Figure 4 It is a side view of the connection between the gas outlet pipe and the gas collecting pipe;

[0025] In the figure: gas outlet pipe 1, gas collecting pipe 2, anchor hook 3, embedded bracket 4, protection plate 5, iron mouth channel 6, mud jacket surface 7, mud jacket 8, furnace shell 9, cooling wall 10, elliptical hole 11, notch 12. DETAILED DESCRIPTION

[0026] The present invention will be further described below by way of examples with reference to the accompanying drawings.

[0027] See attached Figure 1-4 A device for treating coal gas leakage from the iron mouth of a blast furnace comprises a coal gas outlet pipe 1, a coal gas collecting pipe 2, an anchor hook 3, an embedded bracket 4, a protective plate 5, an iron mouth channel 6, a mud sleeve 8, an elliptical hole 11 and a notch 12. A protective plate 5 is provided at the iron mouth of the blast furnace, and an elliptical hole 11 concentric with the iron mouth channel 6 is provided on the protective plate 5. The embedded bracket 4 is fixed on the protective plate 5, and an anchor hook 3 is provided on the embedded bracket 4; the coal gas collecting pipe 2 is arc-shaped, and the arc of the coal gas collecting pipe 2 matches the upper half of the elliptical hole 11. The coal gas collecting pipe 2 is fixed to the upper half of the elliptical hole 11. A through-length notch 12 is provided on the pipe wall of the coal gas collecting pipe 2. The two ends of the coal gas collecting pipe 2 are respectively connected to the coal gas outlet pipe 1, and the coal gas outlet pipe 1 is fixed on the protective plate 5 in a vertical state; the mud sleeve 8 is cast on the protective plate 5 using a casting material.

[0028] In this embodiment, refer to the attached Figure 1-4 , the specific operation process is as follows:

[0029] 1) The iron-making yard of the iron-making outlet with coal gas leakage stops tapping, uses a pneumatic pick to knock off the old mud sheathing, leaking the iron-making outlet protection plate 5, and cleans the material on the iron-making outlet protection plate 5;

[0030] 2) There is an elliptical hole 11 in the middle of the protective plate 5 in the vertical direction. The gas collecting pipe 2 is integrally welded on the upper part of the elliptical hole 11 in the middle of the protective plate 5. The gas collecting pipe 2 is a steel pipe with a diameter of 40 mm and a wall thickness of 3 mm, and a notch 12 with a width of 10 mm is opened along its length. When making it, the steel pipe is first made into an arc shape matching the upper half of the elliptical hole 11, and then a notch is opened on the pipe wall of the steel pipe to prevent deformation of the steel pipe;

[0031] The two ends of the gas collecting pipe 2 are respectively connected to a vertical gas outlet pipe 1. The gas outlet pipe 1 is a steel pipe with a diameter of 40 mm and a wall thickness of 3 mm. The height of the gas outlet pipe 1 is 900 mm. The height of the gas outlet pipe 1 exceeds the upper part of the iron mouth protection plate by 100 mm and is welded to the protection plate as a whole, so that the escaping gas enters the gas outlet pipe 1 through the gas collecting pipe 2 to avoid direct contact between the gas and the mud sheath 8.

[0032] 3) The embedded bracket 4 is welded on the upper half of the iron mouth protection plate 5, i.e., on both sides and the top of the elliptical hole 11. The embedded bracket 4 is welded into a mesh structure by threaded steel with a diameter of ∅ of 12 mm, and the anchor hook 3 is welded on the embedded bracket 4 to increase the strength of the mud sleeve. The gas outlet pipe 1 is located in the mesh embedded bracket 4 and is close to the iron mouth protection plate 5;

[0033] 4) Use mud sleeve castable to cast mud sleeve 8 on the outside of taphole protection plate 5. The castable is made of Al2O3-C-SiC. Use a mixer to add water and mix evenly. The water ratio is 3.5-5%. The fluidity of the stirred castable is required to be 150-180mm. Ensure that the castable has high viscosity and short solidification time, generally ≤40min. Cast the mud sleeve 8 to seal the gas and reduce direct contact and scouring of the mud sleeve 8.

[0034] 5) When pouring the mud sleeve 8, the thickness can be appropriately increased to extend the service life of the mud sleeve 8;

[0035] 6) After pouring the mud sleeve 8, the mud sleeve surface 7 is made according to the contact position between the gun cap and the mud sleeve 8 when the mud gun is plugged.

[0036] After the coal gas escaping from the iron mouth area of ​​the blast furnace enters the coal gas collecting pipe 2, it is guided to the outside of the iron mouth area through the coal gas outlet pipe 1 connected to the coal gas collecting pipe 2 and ignited.

Claims

1. A device for treating coal gas leakage from the iron mouth of a blast furnace, characterized in that: The invention comprises a coal gas outlet pipe (1), a coal gas collecting pipe (2), an anchor hook (3), an embedded bracket (4), a protective plate (5), an iron mouth passage (6), a mud sleeve (8), an elliptical hole (11) and a notch (12); a protective plate (5) is provided at the iron mouth of the blast furnace, an elliptical hole (11) which is concentric with the iron mouth passage (6) is provided on the protective plate (5), an embedded bracket (4) is fixed on the protective plate (5), and an anchor hook (3) is provided on the embedded bracket (4); the coal gas collecting pipe (2) is arc-shaped, and the curvature of the coal gas collecting pipe (2) and the curvature of the elliptical hole (11) are in a straight line. The upper half is matched, the gas collecting pipe (2) is fixed to the upper half of the elliptical hole (11), a through-length notch (12) is provided on the pipe wall of the gas collecting pipe (2), both ends of the gas collecting pipe (2) are respectively connected to the gas outlet pipe (1), and the gas outlet pipe (1) is fixed on the protective plate (5) in a vertical state; a mud sleeve (8) is cast on the protective plate (5) using a casting material; the embedded bracket (4) is a mesh structure welded by threaded steel, and the embedded bracket (4) is fixed on the protective plate (5) on both sides and the upper side of the elliptical hole (11); The elliptical hole (11) on the protection plate (5) which is concentric with the iron mouth channel (6) has a major axis in the vertical direction and a minor axis in the horizontal direction; the protection plate (5) is fixed on the blast furnace shell (9).

2. A method for treating coal gas leakage from the iron mouth of a blast furnace, characterized in that: The following steps are involved: ① A protection plate (5) is provided at the iron mouth of the blast furnace, and an elliptical hole (11) is provided on the protection plate (5) and is concentric with the iron mouth passage (6); ② Fixing the embedded bracket (4) on the protection plate (5) above the elliptical hole (11), and fixing the anchor hook (3) on the embedded bracket (4); ③ A gas collecting pipe (2) is fixed to the upper half of the elliptical hole (11), wherein the gas collecting pipe (2) is arc-shaped, the arc of the gas collecting pipe (2) matches the upper half of the elliptical hole (11), and a through-length notch (12) is provided on the pipe wall of the gas collecting pipe (2); ④ Connecting the two ends of the gas collecting pipe (2) to a gas outlet pipe (1) respectively, wherein the gas outlet pipe (1) is fixed on the protective plate (5) in a vertical state; ⑤ Casting the mud sleeve (8) on the protection plate (5) using a casting material; ⑥ After the coal gas escaping from the iron mouth area of ​​the blast furnace enters the coal gas collecting pipe (2), it is guided to the outside of the iron mouth area through the coal gas outlet pipe (1) connected to both ends of the coal gas collecting pipe (2) and ignited.

3. The method for treating coal gas blowby at the iron mouth of a blast furnace according to claim 2, characterized in that: The elliptical hole (11) on the protection plate (5) and which is concentric with the iron mouth channel (6) has a major axis in the vertical direction and a minor axis in the horizontal direction.

4. The method for treating coal gas blowby at the iron mouth of a blast furnace according to claim 2, characterized in that: The embedded bracket (4) is a mesh structure formed by welding threaded steel bars.

5. The method for treating coal gas blowby at the iron mouth of a blast furnace according to claim 2, characterized in that: The casting material of the casting mud sleeve (8) is Al2O3-C-SiC, and the water addition ratio is 3.5-5%.

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