Method for replacing tapping hole of converter

Abstract

The invention discloses a method for replacing a tapping hole of a converter. Comprising the following steps: S1, converter slag splashing; s2, after the slag is completely poured, the converter is shaken to the tapping hole dismantling angle; s3, tapping hole reaming; s4, after the hole channel of the tapping hole is drilled, the converter is shaken to the mounting position of the tapping hole; s5, placing a new tapping hole; S6, filling the end part of the gap between the new tapping hole and the tapping hole channel with Martin sand, compacting, sintering, and positioning a new tapping hole protection plate and a tapping hole steel plate of the converter shell; s7, material filling is conducted, specifically, a self-flowing material is added into the converter, the converter is shaken to the proper position of the tapping side, and the gap between the new steel outlet and the brick cup is filled with the self-flowing material; s8, sintering after material filling is finished; and S9, after the new tapping hole is replaced, the slag stopping vehicle is corrected in time. The dry-method self-flow sintering process is adopted, the manual gunning time is shortened, the labor intensity of workers is reduced, and the service life of the tapping hole is prolonged by more than 50 furnaces compared with that of a traditional wet-method grouting gunning process.

Description

Technical Field

[0001] The invention relates to a converter, in particular to a method for replacing a steel outlet of a converter. Background Art

[0002] The taphole of converter steelmaking is washed by high-temperature oxidizing molten steel and slag, and has a limited lifespan, making it difficult to replace the taphole. After the taphole reaches its service life, the converter slag blocking effect deteriorates, and the amount of slag in the tapping increases, resulting in contamination of the molten steel cleanliness and reduced alloy yield. To replace the taphole, the original taphole must be removed and a new one installed. The taphole seat bricks are easily damaged during the removal of the original taphole. At the same time, the taphole is heavy and difficult to install. If the installation angle is not appropriate, it will affect the slag blocking effect during the tapping process, and at the same time, it will affect the service life of the taphole and there is a risk of steel leakage. Traditionally, the taphole is replaced by spraying materials. The labor intensity of the workers is high and the efficiency is low, which affects the working efficiency of the converter. In addition, pits or protrusions are prone to appear during the spraying process, which affects the slag blocking effect. During the spraying process, spraying materials are prone to enter the taphole, affecting the use effect of the taphole. Summary of the invention

[0003] The present invention aims to solve the above technical problems, thereby providing a converter tapping port replacement method, improving the replacement efficiency of the tapping port, extending the service life of the tapping port, and reducing labor intensity.

[0004] The present invention solves the technical problem and adopts the following technical solution: A method for replacing a converter tapping port comprises the following steps: S1, converter slag splashing; S2. After the slag is completely poured out, the converter is moved to the dismantling angle of the steel outlet; S3, tapping hole expansion The drill bit of the furnace dismantling vehicle is facing the steel outlet and drilling a hole in the steel outlet; S4. After the tap hole is drilled, the converter is moved to the tap installation position; S5. Place new steel outlet Fill the tap hole with Martin sand and place the new tap hole into the tap hole; S6. Use Martin sand to fill and compact the end of the gap between the new taphole and the taphole channel. After sintering, position the new taphole guard plate and the taphole steel plate of the converter shell; S7, filling Add the self-flowing material into the converter, and shake the converter to the appropriate position on the steel tapping side so that the self-flowing material fills the gap between the new steel tapping port and the base brick; S8, sintering after filling; S9. After the new steel outlet is replaced, calibrate the slag blocking car in time to ensure the slag blocking effect.

[0005] Compared with the prior art, the present invention using the above technical solution has the following beneficial effects: 1) The dry self-flowing sintering process is adopted to reduce the time of manual spraying, reduce the high-temperature working time of workers, and reduce the labor intensity of workers; 2) The replacement process is extremely cold and hot, and the water consumption is very small, which reduces the damage to the bricks inside the steel outlet and the sleeve bricks, and increases the life of the refractory materials. The life of the steel outlet is increased by more than 50 furnaces compared with the traditional wet grouting and gunning process, which greatly reduces the cost; 3) Improve the replacement efficiency of the steel outlet and improve the working efficiency of the converter; 4) The success rate of slag blocking is improved, which reduces the secondary pollution of molten steel caused by slag during steelmaking and protects the environment.

[0006] Further, the optimization scheme of the present invention is: In the step S1, after the slag splashing is completed, the converter is swung to the 0 position, and the fume hood is purged with nitrogen.

[0007] In step S2, the tapping port removal angle is 162 degrees.

[0008] In step S6, the sintering time is 3-5 minutes.

[0009] In the step S8, the sintering time is greater than 40 minutes. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 This is a schematic diagram of self-flowing material filling according to an embodiment of the present invention; In the figure: converter 1; new steel outlet 2; self-flowing material 3. DETAILED DESCRIPTION

[0011] 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 the embodiments.

[0012] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0013] See also Figure 1 This embodiment provides a method for replacing a converter tapping port, which is performed in the following steps: S1, converter slag splashing Before changing the tapping port, carry out slag splashing in the converter. After the slag splashing is completed, shake the converter 1 to the 0 position and purge the smoke hood with nitrogen to prevent the smoke hood and oxygen lance from sticking slag and falling to injure people.

[0014] S2. After the slag in the converter 1 is completely emptied, the converter 1 is shaken to the dismantling angle of the steel outlet, and the dismantling angle is 162 degrees.

[0015] S3, tapping hole expansion Before expanding the hole, confirm the position of the furnace dismantling vehicle to ensure that the drill bit is facing the steel outlet, and the drill bit and the steel outlet angle are adapted to each other, so as to ensure that the drilling angle is accurate, the hole wall is smooth, the hole channel is round, and the size is appropriate to avoid damaging the steel outlet seat bricks. By adjusting the position of the furnace dismantling vehicle and the drill bit angle, the old steel outlet is successfully dismantled and the damage to the steel outlet seat bricks is minimized.

[0016] S4. After the tapping hole is drilled, the converter 1 is moved to the tapping hole installation position; S5. Place new steel outlet Before placing the new steel outlet 2, fill a proper amount of Martin sand into the steel outlet channel, which is beneficial to adjust the angle of the steel outlet and reduce the plugging time after the steel outlet is placed. Use a forklift, crowbar and steel outlet placement handle to place the new steel outlet 2 into the drilled steel outlet channel and adjust the position. The forklift, crowbar and steel outlet placement handle ensure the fast and accurate installation of the steel outlet.

[0017] S6. After the new steel outlet 2 is placed, fill the end of the gap between the new steel outlet 2 and the steel outlet channel with Martin sand and compact it with a wooden stick. After sintering for 3-5 minutes, weld the new steel outlet guard plate to the steel outlet steel plate of the converter shell for positioning, which ensures the angle positioning of the new steel outlet 2 and the fixation and stability of the new steel outlet 2 and the tightness of the material after the angle of the converter 1 is adjusted.

[0018] S7, filling Put the self-flow material 3 into the scrap steel bucket. The composition of the self-flow material 3 is: 73% magnesium oxide, 10% carbon. Add the self-flow material 3 into the converter through the scrap steel bucket. After adding, shake the converter 1 to the appropriate position on the steel tapping side to ensure that the self-flow material 3 can fill the gap between the new steel tapping port 2 and the seat brick.

[0019] S8. After the filling is completed, sintering is carried out, and the sintering time is greater than 40 minutes to ensure the sintering effect.

[0020] S9. After the new steel outlet 2 is replaced, calibrate the slag blocking car in time to ensure that the slag blocking cone is aligned with the position to ensure the slag blocking effect.

[0021] The method for replacing the steel tapping port adopts a dry self-flowing sintering process, which reduces the labor intensity of workers. At the same time, the process is extremely cold and hot, and the process uses very little water, so the service life of the steel tapping port can be extended to more than 50 furnaces.

[0022] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited by the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements all fall within the scope of the present invention to be protected.

Claims

1. A method for replacing a converter tapping port, comprising the following steps: S1, converter slag splashing; S2. After the slag is completely poured out, the converter is moved to the dismantling angle of the steel outlet; S3, tapping hole expansion The drill bit of the furnace dismantling vehicle is facing the steel outlet and drilling a hole in the steel outlet; S4. After the tap hole is drilled, the converter is moved to the tap installation position; S5. Place new steel outlet Fill the tap hole with Martin sand and place the new tap hole into the tap hole; S6. Use Martin sand to fill and compact the end of the gap between the new taphole and the taphole channel. After sintering, position the new taphole guard plate and the taphole steel plate of the converter shell; S7, filling Add the self-flowing material into the converter, and shake the converter to the appropriate position on the steel tapping side so that the self-flowing material fills the gap between the new steel tapping port and the base brick; S8, sintering after filling; S9. After the new steel outlet is replaced, calibrate the slag blocking car in time to ensure the slag blocking effect.

2. The converter tapping port replacement method according to claim 1, characterized in that: In the step S1, after the slag splashing is completed, the converter is swung to the 0 position, and the fume hood is purged with nitrogen.

3. The converter tapping port replacement method according to claim 1, characterized in that: In step S2, the tapping port removal angle is 162 degrees.

4. The converter tapping port replacement method according to claim 1, characterized in that: In step S6, the sintering time is 3-5 minutes.

5. The converter tapping port replacement method according to claim 1, characterized in that: In the step S8, the sintering time is greater than 40 minutes.

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