A method for quickly maintaining the thickness of the lining on the loading side of a converter

Abstract

The present invention discloses a method for rapidly maintaining the thickness of the lining on the charging side of a converter, characterized by comprising: 1. adding scrap steel; 2. performing laser thickness measurement; and 3. performing pig iron block furnace protection. The present invention aims to provide a method for rapidly maintaining the thickness of the lining on the charging side of a converter, thereby facilitating accurate maintenance of the thickness and improving converter maintenance efficiency.

Description

Technical Field

[0001] The invention relates to the technical field of converter lining maintenance, and in particular to a method for quickly maintaining the thickness of a converter loading side lining. Background Art

[0002] The steel market is constantly fluctuating, and most domestic steel mills have already implemented a model that links steel prices to the unit price of scrap steel. They use the difference between the steel selling price and the scrap steel unit price to control the iron-to-steel ratio. When the iron-to-steel ratio continues to decline, scrap steel usage increases. The larger the nominal capacity of the converter, the heavier the scrap weight per trough. To increase the weight of a single trough, heavy scrap steel or recycled castings are generally purchased. When heavy scrap or irregular scrap impacts the loading side, it will inevitably cause the magnesia carbon bricks to break, resulting in steel leakage from the loading side, seriously affecting the normal production operations of the steel mill. Summary of the Invention

[0003] In order to overcome the problem of magnesia carbon bricks being broken due to severe impact of large pieces of scrap steel on the loading side, the purpose of the present invention is to provide a method for quickly maintaining the thickness of the lining on the loading side of the converter, and to accurately maintain the damaged parts of the lining in combination with a laser thickness gauge to ensure the safe operation of the furnace body.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] The present invention provides a method for quickly maintaining the thickness of a converter charging side lining, comprising:

[0006] 1. Adding scrap steel operation:

[0007] The day shift foreman confirms the scrap steel adding angle based on the thickness measurement results and the actual situation of the furnace lining. The angle confirmation is carried out once in each shift.

[0008] 2. Laser thickness measurement regulations:

[0009] Laser thickness measurement of the converter lining is performed after each shift to confirm the weakness of the furnace body and prepare the materials required for furnace body maintenance in advance according to the production schedule;

[0010] 3. Pig iron block furnace protection operation:

[0011] The pig iron block must be dry and not wet, and must not be mixed with other metal materials;

[0012] Each scrap steel trough is loaded with three disks of pig iron blocks. The first disk is placed at the front of the scrap steel trough, the second disk is placed in the middle of the scrap steel trough, and the third disk is placed at the back of the scrap steel trough. A total of 6-8 tons of pig iron blocks can be loaded into one trough.

[0013] After the steel is tapped, do not pour the slag. Shake the furnace at 60 degrees to add pig iron blocks. During the process of adding pig iron blocks, shake the furnace to 70 degrees to make the pig iron blocks evenly spread on the east surface. After the pig iron blocks are added, shake the furnace 90 degrees. After standing for a certain period of time, pour out part of the slag first, leaving a small amount of slag for splashing. Do not pour out the slag after splashing.

[0014] When the steel is tapped after blowing, the tapping personnel should stay away from the tapping side to prevent the pig iron blocks from falling and injuring people during the tapping process;

[0015] After the steel is tapped and the slag is splashed, shake the furnace to hang the slag. After pouring the slag, observe the pig iron blocks on the loading side for normal adhesion before adding scrap steel and iron for production.

[0016] Smelting straight-up steel with S content below 0.0010% is prohibited from use.

[0017] Furthermore, the scrap steel is added at an angle of 45° to 75°.

[0018] Furthermore, each shift is 12 hours.

[0019] Furthermore, after standing for 10 minutes, pour out a portion of the slag.

[0020] Furthermore, it effectively prevents accidents caused by large or super-large pieces of scrap steel damaging magnesia carbon bricks, while reducing the time for turning over materials to maintain the furnace body, improving production efficiency and increasing steel output.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The present invention improves the safety factor of the converter. Before the use of the patent, there was an accident of steel leakage from the side of the converter. After the use of the patent, there was no accident of steel leakage from the side of the converter.

[0023] Improve the impact resistance of the converter charging side to ensure that the magnesia carbon bricks are intact when heavy and irregular scrap steel impacts the charging side;

[0024] Improve the efficiency of furnace maintenance. Previously, each furnace maintenance took 40 to 55 minutes, but this method only takes 20 minutes.

[0025] Reduce the labor intensity of workers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of thickness measurement before loading the pig iron block for maintenance;

[0027] Figure 2 Schematic diagram of thickness measurement after loading side maintenance pig iron block. DETAILED DESCRIPTION

[0028] like Figure 1 As shown,

[0029] In order to accurately maintain the thickness of the converter charging side and improve the maintenance efficiency of the converter body, this embodiment provides a method for quickly maintaining the thickness of the converter charging side lining, comprising the following steps:

[0030] 1. Adding scrap steel operation:

[0031] During each 12-hour shift, the day shift foreman confirms the scrap steel adding angle (between 45° and 75°) based on the thickness measurement results and the actual conditions of the furnace lining. Angle confirmation is performed once per shift.

[0032] 2. Laser thickness measurement regulations:

[0033] After each shift, the converter lining is laser-measured for thickness to confirm the weakness of the furnace body and prepare the materials required for furnace body maintenance in advance according to the production sequence.

[0034] 3. Pig iron block furnace protection operation:

[0035] 1. The pig iron block must be dry and not wet, and must not be mixed with other metal materials.

[0036] 2. Put three disks of pig iron blocks into each scrap steel trough. The first disk is placed in the front of the scrap steel trough, the second disk is placed in the middle of the scrap steel trough, and the third disk is placed in the back of the scrap steel trough. A total of 6-8 tons of pig iron blocks can be loaded into one trough.

[0037] 3. After the steel is tapped, do not pour the slag. Shake the furnace at 60 degrees to add pig iron blocks. During the process of adding the pig iron blocks, shake the furnace to 70 degrees so that the pig iron blocks are evenly spread on the east surface. After the pig iron blocks are added, shake the furnace 90 degrees. After standing for 10 minutes, pour out part of the slag first, leaving a small amount of slag for splashing. Do not pour out the slag after splashing.

[0038] 4. When the steel is tapped after blowing, the tapping personnel should stay away from the tapping side to prevent the pig iron blocks from falling and injuring people during the tapping process.

[0039] 5. After the steel is tapped and the slag is splashed, shake the furnace to hang the slag. After pouring the slag, observe the adhesion of the pig iron blocks on the loading side. Only when it is normal can the material be laid and scrap steel and iron can be added again for production.

[0040] 6. It is prohibited to use smelting straight steel if S is lower than 0.0010.

[0041] By using this furnace body maintenance method, accidents caused by large or super-large scrap steel damaging magnesia-carbon bricks can be effectively prevented. At the same time, the time for turning over the material to maintain the furnace body is reduced, production efficiency is improved, and steel output is increased.

[0042] Examples:

[0043] Compare the thickness measurements before and after loading the side maintenance pig iron block.

[0044] Before loading the side maintenance pig iron block, Figure 1 As shown:

[0045] Thickness measurement data:

[0046] Loading side: 462mm;

[0047] Steel tapping side: 529mm;

[0048] Furnace bottom: 488mm;

[0049] Loading side slag line south: 464mm north: 461mm;

[0050] The slag line on the tapping side is 595mm in the south and 462mm in the north;

[0051] Trunnion south: 425mm north: 572mm;

[0052] Circumferential seam south: 425mm, north: 511mm.

[0053] like Figure 2 As shown, the thickness is measured after the side maintenance pig iron block is loaded:

[0054] Thickness measurement data:

[0055] Loading side: 566mm;

[0056] Steel tapping side: 608mm;

[0057] Furnace bottom: 492mm;

[0058] Loading side slag line south: 649mm north: 708mm;

[0059] The slag line on the tapping side is 543mm in the south and 524mm in the north;

[0060] Trunnion south: 561mm north: 615mm;

[0061] Ring seam south: 402mm north 400mm.

[0062] The embodiments described above are merely descriptions of preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Without departing from the spirit of the present invention, various modifications and improvements made to the technical solutions of the present invention by persons skilled in the art should fall within the scope of protection defined by the claims of the present invention.

Claims

1. A method for quickly maintaining the thickness of the lining on the loading side of a converter, characterized by: include:

1. Adding scrap steel operation: The day shift foreman confirms the scrap steel adding angle based on the thickness measurement results and the actual situation of the furnace lining. The angle confirmation is carried out once in each shift.

2. Laser thickness measurement regulations: Laser thickness measurement of the converter lining is performed after each shift to confirm the weakness of the furnace body and prepare the materials required for furnace body maintenance in advance according to the production schedule; 3. Pig iron block furnace protection operation: Pig iron blocks must be dry and not wet, and must not be mixed with other metal materials; Each scrap steel trough is loaded with three disks of pig iron blocks. The first disk is placed at the front of the scrap steel trough, the second disk is placed in the middle of the scrap steel trough, and the third disk is placed at the back of the scrap steel trough. A total of 6-8 tons of pig iron blocks can be loaded into one trough. After the steel is tapped, do not pour the slag. Shake the furnace at 60 degrees to add pig iron blocks. During the process of adding pig iron blocks, shake the furnace to 70 degrees to make the pig iron blocks evenly spread on the east surface. After the pig iron blocks are added, shake the furnace 90 degrees. After standing for a certain period of time, pour out part of the slag first, leaving a small amount of slag for splashing. Do not pour out the slag after splashing. When the steel is tapped after blowing, the tapping personnel should stay away from the tapping side to prevent the pig iron blocks from falling and injuring people during the tapping process; After the steel is tapped and the slag is splashed, shake the furnace to hang the slag. After pouring the slag, observe the pig iron blocks on the loading side for normal adhesion before adding scrap steel and iron for production. It is prohibited to use smelting straight steel with S content below 0.0010%.

2. The method for quickly maintaining the thickness of the converter charging side lining according to claim 1, characterized in that: The angle of adding scrap steel is between 45° and 75°.

3. The method for quickly maintaining the thickness of the converter charging side lining according to claim 1, characterized in that: Each shift is 12 hours.

4. The method for quickly maintaining the thickness of the converter charging side lining according to claim 1, characterized in that: After standing for 10 minutes, pour out some of the slag.

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