Method for rapidly cleaning converter mouth slag

Abstract

The invention discloses a method for rapidly cleaning slag at a converter mouth. Fragile protective layers are arranged at the water-cooled converter mouth of a converter and the outer surface of the converter on the outer side of the water-cooled converter mouth; when the converter is used, materials brought out by furnace gas penetrate through the water-cooling furnace mouth and fall on the protective layer to form accumulated slag. When the accumulated slag needs to be cleaned, the protective layer attached with the accumulated slag is broken and cleaned, and then a new protective layer is arranged again. According to the method for rapidly cleaning the converter mouth slag, the cleaning time of the converter mouth accumulated slag can be effectively shortened, and the production efficiency of the converter is improved.

Description

Technical Field

[0001] The invention relates to the field of converter smelting technology, and in particular to a method for quickly cleaning converter mouth slag. Background Art

[0002] Since the converter mouth is subjected to high-speed and high-temperature airflow scouring, and a large amount of molten slag splashes on it, steel plates are welded into water-cooled parts to locally cool the mouth of the furnace, which not only reduces erosion, but also makes it easier to remove slag accumulation. However, during the converter smelting process, the furnace gas usually carries a small amount of metal, slag fragments and small particles of bulk materials outside the furnace mouth. Improper smelting control may even cause slag overflow and splashing, causing slag and steel to stick to the water-cooled furnace mouth. If the slag accumulation is too high and not handled in time, it will cause interference and friction with the water-cooled smoke hood, causing water leakage in the flue, affecting smooth production, and even endangering personal safety. Cleaning the slag accumulation at the converter mouth has always been a major problem in converter steelmaking.

[0003] The existing technology mainly uses a furnace dismantling machine for cleaning, but it takes a long time (10-15 minutes) and the frequency increases, resulting in low converter production efficiency. The high-intensity impact of the furnace dismantling machine's drill rod also causes significant damage to the water-cooled furnace mouth, and there have been many furnace mouth water tank leakage accidents. The furnace mouth slag treatment method is single and the treatment efficiency is not high. Summary of the invention

[0004] The purpose of the present invention is to provide a method for quickly cleaning slag at the mouth of a converter, which can effectively shorten the cleaning time of slag accumulation at the mouth of the converter and improve the production efficiency of the converter.

[0005] To achieve the above-mentioned purpose, the present invention provides a method for quickly cleaning the slag at the mouth of a converter, wherein a fragile protective layer is arranged on the water-cooled mouth of the converter and on the outer surface of the converter outside the converter; when the converter is in use, the material brought out by the furnace gas passes through the water-cooled mouth of the converter and falls on the protective layer to form slag accumulation; when the slag accumulation needs to be cleaned, the protective layer with the slag accumulation is broken and cleaned, and then a new protective layer is re-set.

[0006] As a further improvement of the present invention, the protective layer is hardened by thick lime water, and the ratio of quicklime to water in the lime water is 1:3-1:5.

[0007] As a further improvement of the present invention, the lime water is sprayed on the water-cooled furnace mouth and its outer side by a spray gun.

[0008] As a further improvement of the present invention, when it is necessary to break the protective layer with slag deposits attached thereto, the protective layer is broken by the impact head on the working arm of the furnace dismantling machine, and the broken protective layer falls from the water-cooled furnace port and the converter.

[0009] As a further improvement of the present invention, the thickness of the protective layer is 5 mm-20 mm.

[0010] As a further improvement of the present invention, after the protective layer is broken, the powder of the protective layer remaining on the surfaces of the water-cooled furnace port and the converter is swept away.

[0011] Beneficial Effects

[0012] Compared with the prior art, the method for quickly cleaning converter furnace mouth slag of the present invention has the following advantages:

[0013] 1. When the converter is in use, the material brought out by the furnace gas passes through the water-cooled furnace mouth and falls on the protective layer to form slag. The protective layer can play a good role in isolating slag, preventing the slag from directly sticking to the water-cooled furnace mouth and the surface of the converter. Since the protective layer is a fragile material, it can be quickly broken and dropped even by a small force, avoiding cracking and leakage of the water-cooled furnace mouth and extending the service life. The cleaning time is shortened from the traditional 10-15 minutes to 3-5 minutes, which not only greatly shortens the cleaning time of the furnace mouth slag, improves the production efficiency of the converter, shortens the smelting cycle, and increases steel production, but also reduces the labor intensity of workers and eliminates safety hazards.

[0014] 2. The protective layer is hardened by thick lime water, in which the ratio of quicklime to water is 1:3-1:5, ensuring that the lime water is thick and can better adhere to the water-cooled furnace mouth and the outer surface of the converter to prevent it from spreading and ensure sufficient slag separation. In addition, the lime water at this ratio can ensure the uniformity of the spraying.

[0015] The present invention will become more apparent from the following description taken in conjunction with the accompanying drawings, which are used to illustrate embodiments of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0017] Figure 1 This is a diagram of the converter in an upright state;

[0018] Figure 2 This is the tilt state diagram of the converter;

[0019] Figure 3 Schematic diagram of spraying a protective layer on the water-cooled furnace mouth and converter surface. DETAILED DESCRIPTION

[0020] Embodiments of the present invention will now be described with reference to the accompanying drawings.

[0021] Example

[0022] The specific embodiments of the present invention are as follows Figures 1 to 3 As shown, the water-cooling furnace port 3 is arranged at the top of the converter 1, the top blowing pipe 2 passes through the water-cooling furnace port 3 from top to bottom, and the lower end outlet of the top blowing pipe 2 is located in the middle of the inner cavity of the converter 1. In this embodiment, the converter is an oxygen top-blown converter, and oxygen (high-pressure oxygen flow with a purity greater than 99%) is blown into the converter 1 through the top blowing pipe 2, so that it directly reacts with the high-temperature molten iron to remove impurities. Using pure oxygen instead of air can overcome the disadvantages of making steel brittle due to the influence of nitrogen in the air and taking away heat when nitrogen is discharged.

[0023] A smoke hood 4 having a size larger than that of the water-cooling furnace mouth 3 is arranged outside the water-cooling furnace mouth 3. The positions of the smoke hood 4 and the top air blowing pipe 2 are relatively fixed, and the positions of the converter 1 and the water-cooling furnace mouth 3 are relatively fixed. The converter 1 can swing relative to the smoke hood 4 when pouring molten iron, and the smoke hood 4 can minimize the smoke from the water-cooling furnace mouth 3 from entering the external environment.

[0024] The method of quickly cleaning the converter mouth slag is as follows:

[0025] A fragile protective layer 5 is provided on the water-cooling furnace port 3 of the converter 1 and the outer surface of the converter 1 outside thereof. When the converter 1 is in use, the material brought out by the furnace gas passes through the water-cooling furnace port 3 and falls on the protective layer 5 to form slag. When the slag needs to be cleaned, the protective layer 5 with the slag is broken and cleaned, and then a new protective layer 5 is re-set.

[0026] The thickness of the protective layer 5 is 5 mm to 20 mm. The protective layer 5 is hardened by thick lime water, and the ratio of quicklime to water in the lime water is 1:3 to 1:5. In this embodiment, the ratio of quicklime to water in the lime water is 1:4.

[0027] In the present embodiment, lime water is sprayed on the water-cooled furnace port 3 and its outer side by a spray gun 6. When lime water is sprayed each time, the smoke cover 4 is moved away from the outer side of the water-cooled furnace port 3.

[0028] When it is necessary to break the protective layer 5 with slag accumulation, the protective layer 5 is broken by the impact head 7 on the working arm of the furnace dismantling machine, and the broken protective layer 5 falls from the water-cooled furnace mouth 3 and the converter 1.

[0029] After the protective layer 5 is broken, the powder of the protective layer 5 remaining on the surface of the water-cooled furnace mouth 3 and the converter 1 is swept away to ensure that when a new layer of protective layer 5 is sprayed, the protective layer 5 can be well attached to the surface of the water-cooled furnace mouth 3 and the converter 1. Since the protective layer 5 is a fragile material, even if the impact head 7 on the working arm of the furnace dismantling machine strikes with a small force, the protective layer 5 can be quickly broken and dropped, thereby preventing the water-cooled furnace mouth 3 from cracking and leaking, and extending the service life.

[0030] The present invention has been described above in conjunction with the best embodiments, but the present invention is not limited to the embodiments disclosed above, but should cover various modifications and equivalent combinations based on the essence of the present invention.

Claims

1. A method for quickly cleaning converter furnace mouth slag, characterized in that: A fragile protective layer (5) is arranged on the water-cooled furnace mouth (3) of the converter (1) and on the outer surface of the converter (1) outside thereof; when the converter (1) is in use, materials brought out by furnace gas pass through the water-cooled furnace mouth (3) and fall on the protective layer (5) to form slag accumulation; when the slag accumulation needs to be cleaned, the protective layer (5) with the slag accumulation is broken and cleaned, and then a new protective layer (5) is re-arranged.

2. A method for quickly cleaning converter slag according to claim 1, characterized in that: The protective layer (5) is hardened by thick lime water, wherein the ratio of quicklime to water in the lime water is 1:3-1:

5.

3. A method for quickly cleaning converter slag according to claim 2, characterized in that: The lime water is sprayed onto the water-cooled furnace port (3) and its outer side through a spray gun (6).

4. A method for quickly cleaning converter furnace mouth slag according to claim 1, 2 or 3, characterized in that: When the protective layer (5) with slag deposits attached needs to be broken, the protective layer (5) is broken by the impact head (7) on the working arm of the furnace dismantling machine, and the broken protective layer (5) falls from the water-cooled furnace mouth (3) and the converter (1).

5. A method for quickly cleaning converter slag according to claim 2, characterized in that: The thickness of the protective layer (5) is 5 mm-20 mm.

6. A method for quickly cleaning converter slag according to claim 1, characterized in that: After the protective layer (5) is broken, the powder of the protective layer (5) remaining on the surfaces of the water-cooled furnace port (3) and the converter (1) is swept away.

Images