Iron flow guiding device and method for torpedo ladle of blast furnace

Abstract

The present application relates to the field of blast furnace ironmaking, and particularly relates to a blast furnace torpedo ladle iron flow guiding device and method, the tundish comprises a frame, a cover plate, a siphon pipe and a flow guide pipe, the top of the frame is provided with the cover plate, the number of the siphon pipes is two, and the siphon pipes are symmetrically arranged on the two sides of the cover plate, the upper end of each siphon pipe extends out of the cover plate and is connected with one end of a corresponding fan through a pipeline, the lower end of each siphon pipe extends into the frame through the cover plate, the bottom of the frame is provided with two through holes, each flow guide pipe passes through a through hole, the upper end of each flow guide pipe extends into a corresponding siphon pipe, and the lower end of each flow guide pipe extends out of the frame, and the torpedo ladle is located below the corresponding flow guide pipe. The present application has the advantages that: by arranging the vertical flow guide pipe at the bottom of the tundish, the molten iron is directly guided above the torpedo ladle opening, the problem of molten iron scattering caused by the parabolic form of the molten iron falling in the traditional tundish is avoided, and the accuracy of the molten iron guiding is significantly improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of blast furnace ironmaking, in particular to a blast furnace torpedo ladle iron flow guide device and method. BACKGROUND

[0002] The blast furnace tundish is a key end equipment for blast furnace iron tapping, mainly used for guiding the molten iron into the torpedo ladle. The blast furnace tundish is usually installed at the end of the iron discharge channel, with a semi-pear shape (small at both ends and large in the middle), and is driven to swing left and right by a motor, so as to distribute the molten iron into the torpedo ladle on the rail below the iron tapping platform.

[0003] However, the existing blast furnace tundish has the following problems, which seriously affect the safety and efficiency of iron tapping:

[0004] 1. Molten iron splashing and waste:

[0005] Due to the height difference between the end of the tundish and the mouth of the torpedo ladle, the molten iron falls in the form of a parabola, and if the iron flow and the angle of the ladle mouth do not match, the molten iron is likely to scatter to the ground, causing resource waste and safety hazards;

[0006] 2. Energy consumption and mechanical failure:

[0007] The tundish has a large mass and relies on motor drive during swinging, resulting in high energy consumption. At the same time, the mechanical structure is prone to failure (such as motor tripping, swing arm jamming, main shaft breaking, etc.), which may lead to loss of control of molten iron flow and cause safety accidents (such as molten iron falling to the ground). SUMMARY

[0008] The purpose of the present application is to provide a blast furnace torpedo ladle iron flow guide device and method, which is provided with a guide opening at the bottom of the frame, and the upper end of the guide pipe extends into the siphon pipe. The molten iron flows vertically through the guide pipe into the torpedo ladle, improving the stability and safety of the iron tapping process.

[0009] To achieve the above purpose, the present application realizes the following technical scheme:

[0010] A blast furnace torpedo ladle iron flow guide device, comprising a frame, a cover plate, a siphon pipe and a guide pipe, the top of the frame is provided with a cover plate, the number of siphon pipes is two, and they are symmetrically arranged on both sides of the cover plate. The upper end of each siphon pipe extends out of the cover plate and is connected to one end of the corresponding fan through a pipeline. The lower end of each siphon pipe extends into the frame through the cover plate. The bottom of the frame is provided with two through holes, each guide pipe passes through a through hole, the upper end of each guide pipe extends into the corresponding siphon pipe, and the lower end of each guide pipe extends out of the frame. The torpedo ladle is located below the corresponding guide pipe, and the torpedo ladle is used to collect the molten iron flowing out of the guide pipe.

[0011] The other end of each fan is connected with a dust removal pipeline, and valves two are arranged on the pipeline between each fan and the dust removal pipeline.

[0012] The siphon pipe and the cover plate are filled with unshaped refractory material in the gap;

[0013] The flow guide pipe and the through hole are filled with unshaped refractory material in the gap;

[0014] The upper end of the siphon pipe is connected with the pipeline, and the gap between the siphon pipe and the pipeline is sealed with unshaped glue;

[0015] The caliber of the siphon pipe is 30-50 mm larger than that of the flow guide pipe, and the caliber of the flow guide pipe is 40-60 mm larger than that of the iron mouth of the blast furnace.

[0016] The frame is square.

[0017] Each siphon pipe is perpendicular to the cover plate, and the central axis of the corresponding siphon pipe, the central axis of the corresponding through hole and the central axis of the corresponding flow guide pipe are coincident.

[0018] The lower end of each siphon pipe extends into the frame, and the distance between the lower end of the siphon pipe and the inner bottom surface of the swing nozzle is 10-20 cm; the upper end of each flow guide pipe extends into the siphon pipe, and the distance between the lower end opening of the siphon pipe and the inner surface of the frame is 10-20 cm; the distance between the lower end opening of each flow guide pipe and the tank mouth of the torpedo tank is 50-100 cm, and the height between the upper end opening of each flow guide pipe and the lower end opening of the siphon pipe is 50-80 cm.

[0019] The inner surface of the frame is built with a refractory brick layer, and the refractory brick layer is composed of heavy bricks, light bricks and clay bricks from outside to inside.

[0020] A method for guiding molten iron flow into a torpedo tank of a blast furnace, specifically comprising:

[0021] S1, the torpedo tank is located below the corresponding flow guide pipe;

[0022] S2, the iron mouth is opened, and the molten iron flows into the swing nozzle;

[0023] S3, the molten iron liquid surface covers the lower end port of the siphon pipe;

[0024] S4, the corresponding valve one and valve two are opened, and the corresponding fan is started to extract air in the siphon pipe on one side;

[0025] S5, after the molten iron flows out from the flow guide pipe on one side and enters the torpedo tank on one side, the corresponding valve one and valve two are closed, and the corresponding fan is stopped, and the molten iron continuously flows into the torpedo tank on one side through the flow guide pipe on one side;

[0026] S6, one side of the torpedo tank is full, according to steps S4, S5, the other side of the siphon pipe, the liquid level in the siphon pipe drops, the other side of the flow guide pipe disappears, the corresponding valve one and valve two are closed, and the iron discharge is stopped.

[0027] Compared with the prior art, the beneficial effects of the present application are:

[0028] 1. By arranging a vertical flow guide pipe at the bottom of the swing nozzle, the molten iron is directly guided above the torpedo tank opening, avoiding the problem of molten iron scattering caused by the parabolic falling of traditional swing nozzles, and significantly improving the accuracy of molten iron flow guide. Since the molten iron can flow into the torpedo tank more accurately, the risk of molten iron scattering to the ground is reduced, effectively avoiding safety accidents caused by molten iron overflow, and ensuring the safety of the iron discharge process.

[0029] 2. The swing function of the traditional swing nozzle is cancelled, avoiding the consumption of a large amount of electric energy during the swing process, and reducing energy consumption.

[0030] 3. By fixing the flow guide pipe, the use of the swing mechanism is avoided, greatly reducing the failure rate of the equipment and reducing safety accidents such as molten iron falling to the ground caused by equipment failure.

[0031] 4. The flow guide pipe is designed to be detachable, so when the flow guide pipe is worn or damaged, it can be quickly replaced, reducing equipment maintenance time and cost.

[0032] 5. When the molten iron flows into the torpedo tank, simple valve operation and fan starting can realize the siphon effect, so that the molten iron flows smoothly into the torpedo tank, improving the convenience and reliability of the operation, reducing manual intervention, and reducing labor intensity.

[0033] 6. Through the design of the siphon pipes at both ends, the iron discharge can be quickly switched to the other end of the torpedo tank when one tank is almost full, improving the iron discharge efficiency and avoiding accidents caused by molten iron overflow due to untimely switching.

[0034] 7. The upper end of the siphon pipe is connected with a fan and a dust removal pipeline. The fan can extract air from the siphon pipe, which not only helps to form the siphon effect, but also can remove the smoke and dust generated during the flow guide process through the dust removal pipeline, reducing environmental pollution and meeting environmental protection requirements. BRIEF DESCRIPTION OF DRAWINGS

[0035] Figure 1 is a schematic diagram of the structure of the molten iron flow guide device for the torpedo tank of the blast furnace.

[0036] In the figure: 1, frame; 2, cover plate; 3, siphon pipe; 4, flow guide pipe; 5, valve one; 6, fan; 7, valve two; 8, refractory brick layer; 9, fixed brick layer; 10, through hole. DETAILED DESCRIPTION

[0037] The application will be described in detail below with reference to the accompanying drawings, but it should be pointed out that the implementation of the application is not limited to the following embodiments.

[0038] The following examples are implemented on the premise of the technical solutions of the application, and detailed embodiments and specific operation processes are given, but the protection scope of the application is not limited to the following examples. The methods used in the following examples are all conventional methods unless otherwise specified.

[0039] Example 1

[0040] See Figure 1 A blast furnace torpedo tank iron flow guide device, comprising a frame 1, a cover plate 2, a siphon 3 and a flow guide pipe 4, the frame 1 is a flow guide device frame, the cover plate 2 is used to prevent dust in the frame from overflowing, the siphon 3 and the flow guide pipe 4 are made of aluminum-carbon refractory material, the frame 1 is rectangular: 2.5 m long, 1.5 m wide and 1.5 m high, two vertical through holes 10 with a diameter of 30 cm are provided at the bottom of the frame 1 corresponding to the position of the furnace platform railway, the inner surface of the frame 1 is built with a layer of refractory bricks 8, which are heavy bricks, light bricks and clay bricks in turn, two flow guide pipes 4 are installed into the two through holes 10 respectively, the periphery of each flow guide pipe 4 is filled with unshaped refractory material to fill the gap, and a layer of fixed bricks 9 is built on the inner surface of the swing nozzle to fix each flow guide pipe 4, the fixed bricks 9 are heavy refractory bricks; the upper end of each flow guide pipe 4 extends into the siphon 3, the height of the open upper end of each flow guide pipe 4 and the open lower end of the siphon 3 is 50-80 cm, the outer side of the flow guide pipe 4 is covered by the corresponding siphon 3, the lower end of each flow guide pipe 4 extends out of the frame 1, and the distance between the open lower end of the flow guide pipe 4 and the mouth of the torpedo tank is 50-100 cm; the two siphons 3 are fixed on the cover plate 2, the distance between the open lower end of each siphon 3 and the inner surface of the swing nozzle is 10-20 cm, the siphon 3 and the cover plate 2 are perpendicular to each other, the center axis of the siphon 3, the center axis of the through hole 10 and the center axis of the flow guide pipe 4 coincide; the siphon and the flow guide pipe are both made of aluminum-carbon refractory material; a valve 5 is installed at the necked upper end of each siphon 3, the valve 5 is connected to the corresponding fan 6 through a pipeline, the other end of each fan 6 is connected to the corresponding valve 7 through a pipeline, and the other end of each valve 7 is connected to a dust removal pipeline; the valve 5 and the valve 7 are electric butterfly valves.

[0041] A blast furnace torpedo tank iron flow guide method, specifically comprising:

[0042] After the torpedo tank under the tundish is matched, the tap hole is opened, the iron flow enters the tundish, the molten iron liquid level is higher than the lower end port of the siphon pipe 3, the corresponding valve one 5 and valve two 7 are opened, the corresponding fan 6 is started, the air in the corresponding siphon pipe 3 is extracted, when the molten iron flows out from the flow guide pipe 4 and enters the corresponding torpedo tank, the corresponding valve one 5 and valve two 7 are closed, and the corresponding fan 6 is stopped at the same time, at this time, the iron flow continuously flows into the torpedo tank through the flow guide pipe 4. Figure 1 When the torpedo tank A is full, the other end siphon pipe 3 is operated according to the above steps, the other end iron tapping is realized, the other end valve one 5 and valve two 7 are opened, the other end fan 6 is started, the liquid level in the siphon pipe 3 is lowered, the other end valve one 5 and valve two 7 are closed after the iron flow in the flow guide pipe 4 disappears, and the other end fan 6 is stopped at the same time, and the iron tapping is stopped.

[0043] The present application directly guides the molten iron to the top of the torpedo tank by arranging the vertical flow guide pipe at the bottom of the tundish, avoids the problem of molten iron scattering caused by the parabolic form of the traditional tundish, significantly improves the accuracy of molten iron flow guide, reduces the risk of molten iron scattering to the ground, effectively avoids the safety accidents caused by molten iron overflow, and ensures the safety of the iron tapping process; the swing function of the traditional tundish is cancelled, the swing process consumes a large amount of electric energy, the energy consumption is reduced, the use of the swing mechanism is avoided by fixing the flow guide pipe, the failure rate of the equipment is greatly reduced, the safety accidents such as molten iron falling caused by equipment failure are reduced; the flow guide pipe adopts a detachable design, when the flow guide pipe is worn or damaged, it can be quickly replaced, reducing the equipment maintenance time and cost; when the molten iron flows into the torpedo tank, the siphon effect can be realized by simple valve operation and fan starting, the molten iron flows smoothly into the torpedo tank, the operation convenience and reliability are improved, the manual intervention is reduced, and the labor intensity is reduced; through the design of the two end siphon pipes, the iron tapping of the other end torpedo tank can be quickly switched when one tank is almost full, the iron tapping efficiency is improved, and the molten iron overflow accident caused by untimely switching is avoided; the upper end of the siphon pipe is connected with the fan and the dust removal pipeline, the air in the siphon pipe is extracted by the fan, which not only helps the formation of the siphon effect, but also discharges the smoke and dust generated in the molten iron flow guide process through the dust removal pipeline, reduces the pollution to the environment, and meets the environmental protection requirements.

Claims

1. A method of flow guiding of a torpedo ladle iron stream into a blast furnace, characterized by The device comprises a frame, a cover plate, a siphon pipe and a flow guide pipe. The top of the frame is provided with the cover plate. Two siphon pipes are symmetrically arranged on both sides of the cover plate. The upper end of each siphon pipe extends out of the cover plate and is connected with one end of a corresponding fan through a pipeline. The lower end of each siphon pipe extends into the frame through the cover plate. The bottom of the frame is provided with two through holes. Each flow guide pipe extends through the through hole. The upper end of each flow guide pipe extends into the corresponding siphon pipe. The lower end of each flow guide pipe extends out of the frame. The torpedo ladle is located below the corresponding flow guide pipe and is used for containing the molten iron flowing out of the flow guide pipe. The lower end of each siphon pipe extends into the frame. The upper end of each flow guide pipe extends into the siphon pipe. The distance between the open end of the siphon pipe and the inner surface of the frame is 10-20 cm. The distance between the open end of each flow guide pipe and the ladle opening of the torpedo ladle is 50-100 cm. The height between the open end of each flow guide pipe and the open end of the siphon pipe is 50-80 cm. The other end of each fan is connected with a dust removal pipeline. Valves two are arranged on the pipeline between each fan and the dust removal pipeline. Valve one is arranged on the pipeline between one end of each fan and the corresponding siphon pipe. The method specifically comprises the following steps: S1, arranging the torpedo ladle below the corresponding flow guide pipe; S2, opening the iron hole and allowing the molten iron to flow into the swing nozzle; S3, allowing the molten iron liquid level to submerge the lower end port of the siphon pipe; S4, opening the corresponding valve one and valve two and starting the corresponding fan to extract the air in the siphon pipe on one side; S5, after the molten iron flows out of the flow guide pipe on one side and flows into the torpedo ladle on one side, closing the corresponding valve one and valve two and stopping the corresponding fan. The molten iron continuously flows into the torpedo ladle on one side through the flow guide pipe on one side; S6, filling the torpedo ladle on one side. The siphon pipe on the other side is operated according to steps S4 and S5. The liquid level in the siphon pipe drops. After the molten iron flow in the flow guide pipe on the other side disappears, the corresponding valve one and valve two are closed and the tapping is stopped.

2. The method of claim 1, wherein the method is characterized by: The siphon pipe and the cover plate are filled with gaps by using amorphous refractory material. The flow guide pipe and the through hole are filled with gaps by using amorphous refractory material. The upper end of the siphon pipe is connected with the pipeline. The gaps between the siphon pipe and the pipeline are sealed by using amorphous glue. The caliber of the siphon pipe is 30-50 mm larger than that of the flow guide pipe.

3. The method of claim 1, wherein the method is characterized by: The frame is square.

4. The method of claim 1, wherein the method is characterized by, Each siphon pipe is perpendicular to the cover plate. The central axis of the corresponding siphon pipe, the central axis of the corresponding through hole and the central axis of the corresponding flow guide pipe are coincident.

5. The method of claim 1, wherein the method is characterized by: The inner surface of the frame is built with a refractory brick layer. The refractory brick layer comprises, from outside to inside, heavy bricks, light bricks and clay bricks.

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