CN116117113A - Technology for preventing waste heat blank from flowing out of pipe end for intelligent magnetic suspension continuous casting of molten metal - Google Patents

Abstract

The invention discloses a molten metal intelligent magnetic suspension continuous casting waste heat billet preventing molten metal horizontal outflow pipe, which is cooled by the injection of micro water particles of cooling molten metal, so that molten metal cannot smoothly flow out to enter an alternating magnetic field to ensure that production cannot be smoothly carried out, and belongs to the field of metal material production in the metallurgical industry. The front end of a metal liquid horizontal outflow pipe of various tundish (or holding furnace, hereinafter referred to as bag) is provided with a water baffle plate (a hole for the metal liquid to flow out of the plate) formed by high temperature resistant cloth and supporting materials, so that water particles sprayed to the outflow pipe can be blocked, the outflow pipe is not cooled, the metal liquid smoothly and stably flows out and enters an alternating magnetic field, and the production is smoothly carried out.

Description

Liquid metal intelligent magnetic levitation continuous casting waste heat blank to prevent outflow pipe end cooling technology

【Technical field】

The metal liquid intelligent magnetic levitation continuous casting waste heat billet prevents the cooling technology of the pipe end from flowing out and belongs to the field of metal material production in the metallurgical industry.

【Background technique】

The main processes of the production process of metal materials such as steel, aluminum, copper, zinc, titanium, lead and magnesium are: 1. Raw material preparation (including mining, ore dressing...) → 2. Smelting → 3. Billet casting → 4. Heating → 5. Thermal processing → 6. Cold processing (including intermediate annealing) → 7. Processes such as finishing, inspection, packaging and warehousing.

Among the various processes of the above-mentioned production process, process 3. The technological principle of the billet and its semi-finished products affect the simplification and complexity of the subsequent processes 4, 5, and 6; restrict energy consumption per unit of product, improve product quality, and reduce costs and increase income .

Today, the main production technology of metal material billet casting process at home and abroad is water-cooled mold continuous casting, hereinafter referred to as DCC.

DCC principle: The molten metal flows into the crystallizer and contacts the inner shell wall of the crystallizer, so that the molten metal cools down into a solid phase and forms a hard shell. The frictional force is continuously pulled out of the crystallizer, and the metal slab is continuously cast.

Billet casting speed of DCC: steel ingot (billet) is 2.7-5m/min, copper billet is 0.1-0.5m/min.

Billet temperature of DCC: steel ingot (billet) is ≤900°C, copper and aluminum billet is room temperature.

The casting billet of DCC should not be too fast and the temperature should not be too high, otherwise, the shell of the casting billet would be broken due to insufficient strength, and the molten metal would spew out and leak into a major accident.

The main defect of DCC: consumption of crystallizer and a large amount of high-pressure cooling water, excessive heat loss in the molten metal, and casting into steel ingots at ≤900°C, while the hot rolling temperature of steel ingots is 1050-1250°C, which must be reheated. Some use ≤ 900 ℃ steel ingots to directly roll into products, which is an illegal operation and causes many problems.

In the field of copper materials, DCC can only cast copper billets whose subsequent cold processing accounts for more than 80% of the total production workload of the product, leaving a large amount of production workload for cold processing (including intermediate annealing) that consumes a lot of energy and materials.

Invention patent, ZL200510021740.4 <Metal Liquid Magnetic Suspension Continuous Casting Process for Near-Net Waste Heat Rolling Billets> (hereinafter referred to as MFCC), can subvert and eliminate water-cooled continuous casting.

The principle of MFCC: Constrain the molten metal at the mouth of the ladle (or furnace, the same below) through the casting mold (outflow pipe) into a final shape liquid column (liquid sheet) with hot and cold machining allowance cross-section size, and is drawn into 5 ~ 30KHz Alternating magnetic field, the molten metal is repelled and suspended by electromagnetic induction (at the same time, it is stirred by electromagnetic stirring) and is moderately cooled to the final shape waste heat cast slab at the optimum thermal processing temperature of the brand metal during continuous movement to the thermal processing machine, and is immediately heated online Processing, so that the metal liquid can be made into steel in one step on-line according to the process requirements, or into copper billets, aluminum billets and mechanical parts billets with a subsequent cold processing amount of <20%.

Advantages of magnetic levitation continuous casting and online thermal processing:

1. Substantially optimize the billet structure (electromagnetic stirring effect) to improve the strength of the billet, thereby increasing the strength of the material;

2. Significantly simplifies the production process, while ensuring the minimum number of hot and cold processing passes required by the product strength, thereby reducing energy consumption, metal loss and various consumption, achieving energy saving in production, carbon emission reduction, product quality improvement, cost reduction and income increase.

3. Magnetic levitation continuous casting and on-line thermal processing into material or net fine shape billet greatly reduce the amount of subsequent cold processing and intermediate annealing passes. Therefore, when the output is the same, 1/3 to 2/3 of the equipment (except the furnace) is idle.

4. The principle of maglev continuous casting is simple, easy to operate and easy to control. The main equipment of the new maglev continuous casting production line is the power supply. There are many domestic manufacturers, and it is easy to add auxiliary equipment.

From the above knowledge, maglev continuous casting will inevitably subvert and eliminate water-cooled continuous casting.

Magnetic levitation continuous casting is for the liquid metal to flow directly into the alternating magnetic field to suspend and cool down, requiring intelligent control to achieve stable and safe production

【Summary of the invention】

The molten metal flows out from the outflow pipe of the tundish (or holding furnace, hereinafter referred to as the tundish) through control, is drawn into the alternating magnetic field, and moves continuously to the thermal processing machine, and is cooled to the grade by the micro-water particles sprayed around it. Optimum thermal processing temperature, enter the thermal processing machine for thermal processing and post-processing treatment.

The fine water particles must be sprayed around the molten metal that has just flowed out from the front end of the outflow pipe, but cannot be sprayed onto the outflow pipe to cool the outflow pipe, and then the molten metal cannot cool down smoothly and smoothly, and production stops.

In order to prevent the above, a water baffle must be installed at the front end of the outflow pipe to block the spray of micro water particles around the metal liquid column (or plane, the same below) sprayed out to the outflow pipe in the horizontal direction.

The water baffle must have a hole so that the front end of the tractor head can pass through the hole to reach the slope at the lower end of the outflow pipe, and the groove at the front end of the tractor head receives the molten metal flowing out of the outflow pipe. The size of the upper, lower, left and right sides of the water retaining plate hole is greater than the size around the front end of the traction head (the rear end of the traction head is placed on the moving track of the traction frame) is greater than ≈2mm.

Because there is a thickness under the groove of the tractor head, two seams must be cut under the hole of the water baffle, so that when the groove part of the tractor head is inserted into the lower inclined surface of the outflow pipe to receive the molten metal, the plate in the two seams It can be bent toward the side of the outflow pipe; when the tractor head moves out of the water baffle hole, the bent part automatically returns to the vertical version.

The upper part of the front part of the puller groove is a downward slope, which enters the lower end of the outflow pipe to receive the molten metal; the lower part is an upward slope to reduce the bending degree of the suture middle plate.

In the longitudinal direction, the distance between the rear side of the water baffle and the front end of the outflow pipe is ≤30mm, and this dimension should be minimized.

The water particles blocked by the upper part of the water baffle converge and flow down to the molten metal, which is beneficial to the maglev continuous casting process.

[Invention Content 1]

On the basis of the invention patent application number 202310047200.1, a water baffle is installed, as shown in 10 in Figure 1 of the specification.

Its principle of work: the water retaining plate 10 among the accompanying drawings 1 blocks the water particle sprayed by the micro-water particle nozzle 11 and is sprayed on the outflow pipe 18 to prevent the outflow pipe from cooling down.

The water particles received by the upper end of the water retaining plate fall on the upper surface of the continuously flowing molten metal, which is beneficial to the process of magnetic levitation continuous casting of the molten metal into a cast slab with waste heat.

[Description of Attachment 1]

Fig. 1 is a schematic diagram of the first content of the invention, and the serial numbers in the accompanying drawing 1 are consistent with the following serial numbers.

1. Package (furnace) shell: It is made of steel plate or glass fiber plate and other materials.

2. Thermal insulation felt.

3. Refractory bricks.

4. Covering agent.

5. Liquid metal.

6. Cesium 137 ray source.

7. Insulation cover. It is divided into two parts, the movable plate (suspended when adding molten metal) and the fixed plate, which are composed of heat insulating material and steel frame.

8. Slag blocking board. Made of refractory material.

9. Adhesive for slag blocking board. A high-temperature adhesive bonds the flashing to the furnace wall tiles.

10. Water flap

11. Spray water particles and water mist recovery system.

12. Waste heat billet.

13. Thermal processing system. It can be a rolling mill, extrusion machine or die casting machine.

14. Post-processing system for heat-processed products.

15. Programmable Logic Controller (PLC).

16. Traction system. It consists of a traction head, a traction rope, a bracket and a traction machine.

17. Alternating magnetic field. It consists of an alternating current source and a coil made of copper tubing.

18. Liquid metal outflow pipe. Made of refractory material.

19. Bottom refractory bricks.

20. Furnace support and rotation system.

21. The overall lifting actuator.

22. Cesium 137 ray absorption sensor.

23. Overall support and rotation system.

24. Furnace lifting actuator

[Summary of the invention-a specific embodiment]

SUMMARY OF THE INVENTION 10 in the accompanying drawing is a three-layer material, with high-temperature insulation cloth on both sides and a glass fiber board in the middle. Both are bonded with a high-temperature adhesive (such as aluminum dihydrogen phosphate + 200 mesh corundum powder). And fix it on the outer wall of the bag with multiple bolts and nuts.

[Invention content two]

On the basis of the invention patent application number 202211670405.5 [Invention Content 1], a water baffle is installed, as shown in 8 in attached drawing 2.

Its principle of work: the water retaining plate 8 among the accompanying drawing 2, blocks the water particle that micro-water particle nozzle 10 sprays and is sprayed on outflow pipe 17, prevents outflow pipe from cooling down.

The water particles received by the upper part of the water retaining plate fall on the upper surface of the continuously flowing molten metal, which is beneficial to the process of magnetic levitation continuous casting of the molten metal into a cast slab with waste heat.

[Description of Attachment 2]

Fig. 2 is a schematic diagram of the second content of the invention, and the serial numbers in the accompanying drawing 2 are consistent with the following serial numbers.

1. Tundish (or holding furnace, the same below, referred to as tundish). The outer shell is made of steel plate and glass fiber board, heat insulating material and refractory brick and other materials.

2. Liquid metal.

3. Covering agent.

4. Cesium 137 radiation source.

5. Stopper rod. Made of refractory material.

6. Stopper rod lifting actuator. There are electric, hydraulic and pneumatic, you can choose one, preferably electric.

7. Clamping mechanism for plug-in outflow tube 17 . It consists of a clamping plate (made of steel or glass fiber plate), a central shaft, an upper nut, and a screw rod.

8. Flap. There is a hole in the middle, which is convenient for clamping device 7 to operate.

9. Waste heat billet.

10. Micro water spray and water mist recovery system.

11. Thermal processing system.

12. Thermally processed products.

13. Post-processing system for thermally processed products.

14. PLC (programmable logic controller).

15 traction system.

16. Alternating magnetic field.

17. Liquid metal outflow pipe.

18. Low temperature binder (such as yellow mud + red sand). Block the outflow pipe 17 and the outflow socket 19 insertion gap.

19. The molten metal flows out of the socket. Made of refractory material, it is fixedly installed on the refractory brick wall on the outflow side of the bag.

20. Refractory filler.

21. Spread the flow core. Made of refractory material. The molten metal flows into the standpipe 22 through the gap between the stopper rod and the stopper rod seat, the molten metal is widened to the size of the billet width by means of the spreader core, and flows into the alternating magnetic field from the outflow pipe 17.

22. Standpipe. Made of refractory material. It is the molten metal outflow channel, and a spreader core is installed to widen the molten metal to the width of the slab.

23. Stopper seat. Made of refractory material. Form the gap A with the 5 pointed ends of the stopper rod. The stopper rod is raised and lowered by the actuator 6, the value of A is changed, and the outflow of molten metal is controlled to achieve a constant speed outflow and stable production.

24. Cesium 135 ray absorption sensor. Convert the received ray information into electrical information, input 15, PLC, regulate the lifting of stopper rod 5, and change the outflow of molten metal.

25. Insulated frame. The radiation sensor 24 is protected from heat.

[Content of the invention two specific implementation modes]

Summary of the Invention The water retaining plate 8 in Figure 2 is a three-layer material, with high-temperature insulation cloth on both sides and a glass fiber board in the middle. Both are bonded with a high-temperature adhesive (such as aluminum dihydrogen phosphate + 200 mesh corundum powder). And fix it on the outer wall of the bag with multiple bolts and nuts. .

【Invention Three Contents】

Invention 3 is to add a water barrier on the basis of the invention patent application number 202211670405.5 [Invention Content 2], as shown in 16 in attached drawing 3.

Its working principle: the water baffle 16 in the accompanying drawing 3 blocks the water particles ejected from the micro-water particle nozzle 7 and sprays on the outflow pipe 18 to prevent the outflow pipe from cooling down, thereby cooling down the molten metal, resulting in poor flow of the molten metal and its hazards .

The water particles received by the upper part of the water retaining plate fall on the upper surface of the continuously flowing molten metal, which is beneficial to the process of magnetic levitation continuous casting of the molten metal into a cast slab with waste heat.

[Description of Attachment 3]

Fig. 3 is a schematic diagram of the third content of the invention, and the serial numbers in the accompanying drawing 3 are consistent with the following numbers.

1. Tundish (or holding furnace) shell. It consists of steel plate or glass fiber plate.

2. Thermal insulation material.

3. Refractory bricks.

4. Covering agent.

5. Liquid metal.

6. Cesium 137 radioactive source.

7. Micro water spray and water mist recovery system

8. Waste heat billet.

9. Thermal processing mechanical system.

10. Thermally processed products.

11. Thermal processing product processing system.

12. PLC (programmable logic controller).

13. Traction system.

14. Alternating magnetic field.

15. Cesium 137 ray absorption sensor.

16. Flap.

17. Slide the middle plate.

18. Liquid metal outflow pipe.

19. Vertical pipe and horizontal outflow pipe are combined with wrapping material.

20. Standpipe. It has the function of expanding the width of molten metal to meet the width of the slab.

21. Lower board.

22. Upper board.

23. Middle plate sliding actuator.

【Content of the Invention Three Specific Embodiments】

Summary of the Invention The baffle 16 in Figure 3 is made of three layers of materials, with high-temperature insulation cloth on both sides and a glass fiber board in the middle. Both are bonded with a high-temperature adhesive (such as aluminum dihydrogen phosphate + 200 mesh corundum powder). And fix it on the bottom wall of the bag with multiple bolts and nuts.

Claims (1)

1. The metal liquid horizontal outflow pipe of various tundish (or holding furnace, hereinafter referred to as ladle) can be cooled by water particles sprayed to the metal liquid to properly cool the metal liquid, so that the metal liquid cannot smoothly and stably flow into an alternating magnetic field to influence the smooth production;

in order to prevent the above, a water baffle is installed at the front end of the outflow pipe to prevent the water particles sprayed to the metal liquid column (or plane, same below) flowing out in the horizontal direction from being sprayed to the outflow pipe;

the water baffle must have a hole, make the front end of the drawing head can pass the hole and reach the slope of lower end of the outflow pipe, the front end recess of the drawing head receives the molten metal flowing out of the outflow pipe; the upper, lower, left and right dimensions of the water baffle holes are approximately 2mm larger than the peripheral dimensions of the front end of the traction head (the rear end of the traction head is placed on the moving track of the traction frame);

because the groove of the traction head has a thickness, two seams are cut under the water baffle holes, and when the groove of the traction head is inserted into the lower inclined surface of the outflow pipe to receive molten metal, the plates in the seams can bend towards the outflow pipe; after the traction head moves out of the water baffle hole, the bending part is automatically restored to a vertical plate;

the lower part of the front part of the traction head groove is an upward inclined plane, so that the bending degree of the plate in the suture line is reduced;

in the longitudinal direction, the distance between the rear side of the water baffle and the front end surface of the outflow pipe is less than or equal to 30mm, and the distance is reduced as much as possible;

the method is characterized in that: in order to prevent the outflow pipe from cooling, a water baffle is arranged at the front end of the outflow pipe to block micro-water particles around a metal liquid column (or plane) sprayed in the horizontal direction from being sprayed to the outflow pipe, so that the outflow pipe is cooled to influence production;

the water baffle must have a hole, make the front end of the drawing head can pass the hole and reach the slope of lower end of the outflow pipe, the front end recess of the drawing head receives the molten metal flowing out of the outflow pipe; the upper, lower, left and right dimensions of the water baffle holes are approximately 2mm larger than the peripheral dimensions of the front end of the traction head (the rear end of the traction head is placed on the moving track of the traction frame);

because the groove of the traction head has a thickness, two seams are cut under the water baffle holes, and when the groove of the traction head is inserted into the lower inclined surface of the outflow pipe to receive molten metal, the plates in the seams can bend towards the outflow pipe; after the traction head moves out of the water baffle hole, the bending part is automatically restored to a vertical plate;

the lower part of the front part of the traction head groove is an upward inclined plane, so that the bending degree of the plate in the suture line is reduced;

in the longitudinal direction, the distance between the rear side of the water baffle and the front end surface of the outflow pipe is less than or equal to 30mm, and the distance is reduced as much as possible.

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