CN115635072A - Pouring device and method for stably controlling liquid level of tundish - Google Patents
Pouring device and method for stably controlling liquid level of tundish Download PDFInfo
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- CN115635072A CN115635072A CN202211207895.7A CN202211207895A CN115635072A CN 115635072 A CN115635072 A CN 115635072A CN 202211207895 A CN202211207895 A CN 202211207895A CN 115635072 A CN115635072 A CN 115635072A
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Abstract
The invention relates to a pouring device and a method for stably controlling the liquid level of a tundish, belonging to the technical field of steelmaking-continuous casting production processes in the metallurgical industry. The technical scheme is as follows: contain two and excessively wrap and a middle package, two are excessively wrapped a package in the middle of sharing, the package end of excessively wrapping is equipped with the annular air brick that argon gas bottom-blown. The invention has the beneficial effects that: the two transition ladles can be circularly and continuously cast into the tundish, so that the flow of the inlet and the outlet of the tundish in unit time is equal, the liquid level stability of the tundish is improved, and the buffering capacity and the smelting capacity in the continuous casting process are enhanced. The problems of flow field disorder, rapid impurity inflow into a crystallizer and the like caused by that the liquid level of the traditional tundish descends and then rises in the ladle changing process are solved. Argon blowing operation is carried out at the bottom of the transition ladle, and impurities such as non-metallic inclusions, hydrogen and nitrogen in molten steel are removed through micro bubbles.
Description
Technical Field
The invention relates to a pouring device and a method for stably controlling the liquid level of a tundish, belonging to the technical field of steelmaking-continuous casting production processes in the metallurgical industry.
Background
With the continuous improvement of the requirements of users on the quality of steel, tundish metallurgy has become an important ring in the production of clean steel. The tundish not only plays a role in stabilizing pressure, distributing molten steel and ensuring a buffer container for continuous casting of the molten steel, but also plays a role in removing inclusions in the last reactor before the molten steel is solidified. Therefore, the tundish is important for improving the quality of the cast slab. In the pouring process of the tundish, when the ladle molten steel is poured and replaced, the liquid level of the tundish is reduced, the removal rate of inclusions can be greatly reduced, the slag entrapment phenomenon can be caused, and the quality of a casting blank is reduced. When a new ladle starts to be cast again, the liquid level of molten steel rises again, the molten steel turbulence area is greatly increased, the temperature is uneven, the quality of a casting blank is unstable, and the production of clean steel is not facilitated.
Patent CN1978093A discloses a tundish metallurgy method for improving molten steel purity, which divides a tundish into a refining area and a casting area, and uses an electromagnetic stirring device to float and remove impurities in the refining area and homogenize molten steel components and temperature in the casting area. Patent CN102009150A discloses a liquid level control method of a pouring tundish and a device thereof, wherein a floating ball device is arranged in the pouring tundish and is electrically connected with a melt pump, so that the switch of the melt pump can be automatically adjusted according to actual production requirements, and the fluctuation of the liquid level in an allowable range is ensured. Patent CN104624996B discloses a molten steel level control method, which detects the height of the liquid level in a ladle through an inverted U-shaped device so as to control the flow rate of molten steel. Patent CN214349484 discloses a tundish molten steel level control device, which senses liquid level information through an electromagnetic liquid level sensor and sends the liquid level information to a PLC system, and the PLC controls a sliding water gap and a tundish stopper rod to perform automatic control. The patent CN108889917A discloses a constant liquid level control method in a tundish continuous casting process, which is realized by a method of circularly casting three ladles on a tundish.
The steel ladle rotary table is removed, the casting position of the tundish is simply increased, so that a plurality of ladles can realize circulating casting, but the removal rate of impurities in molten steel and the consistency of the temperature of the molten steel cannot be guaranteed, and the quality of casting blanks is influenced.
Disclosure of Invention
The invention aims to provide a pouring device and a method for stably controlling the liquid level of a tundish, which can realize the stability and invariability of the liquid level of molten steel in the whole pouring process of the tundish, improve the removal rate of inclusions and the consistency of the temperature of the molten steel and solve the problems in the background technology.
The technical scheme of the invention is as follows:
the utility model provides a pouring device of middle package liquid level stable control, contains two and excessively wraps and a middle package, and two excessively wrap a shared middle package, the package end of excessively wrapping is equipped with the annular air brick of argon bottom blowing.
The tundish is of a T-shaped structure consisting of a pouring area and a tapping area, the pouring area is provided with two pouring positions matched with the transition ladle, each pouring position is provided with a current stabilizer, and one side of each current stabilizer is provided with an upper retaining wall; the tapping zone is provided with a lower retaining wall and an immersion type water gap, the lower retaining wall is provided with a flow guide hole, and the bottom of the tundish in the tapping zone is of a double-step structure.
The outer diameter of the current stabilizer is 600-700 mm, the height of the current stabilizer is 200-300 mm, and the distance between the upper baffle wall and the tundish bottom is 200-300 mm.
The height of the lower retaining wall of the tapping area is 350-450 mm, and the height of the double steps is 100-150 mm.
A pouring method for stably controlling the liquid level of a tundish is operated according to the following steps:
the method comprises the following steps: pouring molten steel in a first furnace ladle into an A-position transition ladle, and performing argon bottom blowing on the A-position transition ladle to balance the temperature of the molten steel;
step two: pouring the A-position transition ladle molten steel into a tundish, and keeping the liquid level of the tundish stable;
step three: pouring the second furnace large ladle molten steel into a B-position transition ladle, and carrying out argon bottom blowing on the B-position transition ladle to balance the temperature of the molten steel;
step four: when the balance of the molten steel in the A-position transition ladle is 20%, pouring the molten steel in the B-position transition ladle into a tundish, and controlling the total flow of the molten steel in the A-position transition ladle and the B-position transition ladle to be constant so as to keep the liquid level of the middle Bao Heng for casting production;
step five: after the molten steel in the A-position transition ladle is cast, baking and heating the A-position transition ladle in the empty ladle state;
step six: pouring molten steel of a third furnace large ladle into the A-position transition ladle, and when the balance of the molten steel of the B-position transition ladle is 20%, the A-position transition ladle starts to pour again, and the total flow rates of the molten steel of the A-position transition ladle and the B-position transition ladle are controlled to be unchanged so as to keep the liquid level of Bao Heng in the middle for casting production;
step seven: after the molten steel in the B-position transition ladle is cast, baking and heating the B-position transition ladle in an empty ladle state;
step eight: the operation is circulated according to the steps.
The baking temperature of the A-bit transition packet and the B-bit transition packet in the empty packet state is more than 950 ℃.
The invention has the beneficial effects that: the two transition ladles can be circularly and continuously cast into the tundish, so that the flow of the inlet and the outlet of the tundish in unit time is equal, the liquid level stability of the tundish is improved, and the buffering capacity and the smelting capacity in the continuous casting process are enhanced. The problems of flow field disorder, rapid impurity inflow into a crystallizer and the like caused by that the liquid level of the traditional tundish descends and then rises in the ladle changing process are solved. Argon blowing operation is carried out at the bottom of the transition ladle, and impurities such as non-metallic inclusions, hydrogen and nitrogen in molten steel are removed through micro bubbles.
Drawings
FIG. 1 is a schematic view of the overall structure of the present invention;
FIG. 2 is a top view of the present invention;
FIG. 3 is a side view of the present invention;
in the figure: the device comprises a steel ladle 1, a transition ladle 2, an annular air brick 3, a transition ladle fixing platform 4, a tundish 5, a flow stabilizer 6, an upper baffle wall 7, a lower baffle wall 8, a lower baffle wall diversion hole 9, an immersion type water gap 10, a long water gap 11 and a ladle bottom step 12.
Detailed Description
The invention is further illustrated by way of example in the following description with reference to the accompanying drawings.
Referring to the attached figures 1-3, the pouring device for stably controlling the liquid level of the tundish comprises two transition ladles and a tundish, wherein the two transition ladles share the tundish, and the ladle bottom of each transition ladle is provided with an annular air brick for argon bottom blowing.
In this embodiment, excessive package 2 includes that the excessive package of A position and the excessive package of B position, and the excessive package of A position and the excessive package of B position are fixed respectively on transition package fixed platform 4, and the package end of the excessive package of A position and the excessive package of B position all is equipped with annular air brick 3 and the long mouth of a river 11 that argon bottom blown.
The tundish 5 is of a T-shaped structure consisting of a pouring area and a tapping area, the pouring area is provided with two pouring positions matched with the tundish, each pouring position is provided with a current stabilizer 6, the outer diameter of each current stabilizer 6 is 600mm, the height of each current stabilizer is 250mm, one side of each current stabilizer 6 is provided with an upper retaining wall 7, and the distance between each upper retaining wall 7 and the tundish bottom is 250mm.
The tapping area is provided with a lower retaining wall 8 and an immersion type water gap 10, the height of the lower retaining wall 8 is 450mm, the lower retaining wall 8 is provided with a diversion hole 9, the bottom of the tundish in the tapping area is of a double-step structure, and the height of the double steps is 100mm.
A pouring method for stably controlling the liquid level of a tundish is operated according to the following steps:
the method comprises the following steps: pouring molten steel in a first furnace ladle into an A-position transition ladle, and carrying out argon bottom blowing on the A-position transition ladle to balance the temperature of the molten steel;
step two: pouring the A-position transition ladle molten steel into a tundish, and keeping the liquid level of the tundish stable;
step three: pouring the second furnace large ladle molten steel into a B-position transition ladle, and carrying out argon bottom blowing on the B-position transition ladle to balance the temperature of the molten steel;
step four: when the balance of the molten steel in the A-position transition ladle is 20%, pouring the molten steel in the B-position transition ladle into a tundish, and controlling the total flow of the molten steel in the A-position transition ladle and the B-position transition ladle to be constant so as to keep the liquid level of the middle Bao Heng for casting production;
step five: after the molten steel in the A-position transition ladle is cast, baking and heating the A-position transition ladle in the empty ladle state;
step six: pouring molten steel of a third furnace large ladle into the A-position transition ladle, and when the balance of the molten steel of the B-position transition ladle is 20%, the A-position transition ladle starts to pour again, and the total flow of the molten steel of the A-position transition ladle and the B-position transition ladle is controlled to be unchanged so as to keep the liquid level of Bao Heng in the middle for casting production;
step seven: after the molten steel in the B-position transition ladle is cast, baking and heating the B-position transition ladle in an empty ladle state;
step eight: the operation is circulated according to the steps.
The baking temperature of the A-bit transition packet and the B-bit transition packet in the empty packet state is more than 950 ℃.
Example 1:
the middle capacity of the double casting positions is 50t, the main body is a steel shell, the inner wall is built with refractory materials, and two casting positions, namely an A position and a B position, are arranged in the casting area. The transition packet capacity above the tundish is 100t each.
Referring to the attached drawings 1, 2 and 3, when casting, all molten steel in a large ladle is cast into an A-position transition ladle. The gas flow of argon blowing at the bottom of the transition ladle is 300L/min and is reduced along with the reduction of the residual steel amount in the transition ladle. The pulling speed of the crystallizer is 1m/min. And opening a sliding water gap of the A-position transition ladle to start casting into the tundish, controlling the flow at 15t/min to enable the liquid level of the tundish to rise rapidly, and controlling the flow at 5t/min when the liquid level is stabilized at a required position. When the residual molten steel in the transition ladle at the A position is less than 20t, the transition ladle at the B position starts casting, the flow sum of the outlets of the two transition ladles is kept at 5t/min by controlling the sliding plate, and the liquid level of the tundish is kept unchanged. And baking and heating the A-position transition ladle in an empty ladle state to reduce temperature drop, and pouring the A-position transition ladle after the next furnace ladle comes. When the residual amount of the B-position transition package is less than 20t, the A-position transition package starts casting, and the processes are circulated in sequence.
Example 2:
and (3) continuously casting at a high drawing speed of 1.5m/min. And opening a sliding water gap of the A-position transition ladle to start casting into the tundish, controlling the flow at 15t/min to enable the liquid level of the tundish to rise rapidly, and controlling the flow at 7.5t/min when the liquid level is stabilized at a required position. When the residual molten steel in the transition ladle at the position A is less than 30t, the transition ladle at the position B starts casting, the sum of the flow rates of the outlets of the two transition ladles is kept to be 7.5t/min by controlling the sliding plate, and the liquid level of the tundish is kept unchanged. And baking and heating the A-position transition ladle in an empty ladle state, and pouring the A-position transition ladle after the next furnace ladle comes. When the residual amount of the B-position transition package is less than 30t, the A-position transition package starts casting, and the processes are circulated in sequence.
Claims (6)
1. The utility model provides a pouring device of tundish liquid level stability control which characterized in that: contain two and excessively wrap and a middle package, two are excessively wrapped a package in the middle of sharing, the package end of excessively wrapping is equipped with the annular air brick that argon gas bottom-blown.
2. A pouring apparatus for steady-state control of the surface of a tundish according to claim 1, wherein: the tundish is of a T-shaped structure consisting of a pouring area and a tapping area, the pouring area is provided with two pouring positions matched with the transition ladle, each pouring position is provided with a current stabilizer (6), and one side of each current stabilizer (6) is provided with an upper retaining wall (7); the tapping area is provided with a lower retaining wall (8) and an immersion type water gap (10), the lower retaining wall (8) is provided with a diversion hole (9), and the tundish bottom of the tapping area is of a double-step structure.
3. A pouring apparatus for steady-state control of the surface of a tundish according to claim 2, wherein: the outer diameter of the current stabilizer (6) is 600-700 mm, the height of the current stabilizer is 200-300 mm, and the distance between the upper baffle wall (7) and the tundish bottom is 200-300 mm.
4. A pouring apparatus for steady-state control of the surface of a tundish according to claim 3, wherein: the height of a lower retaining wall (8) of the tapping area ranges from 350 to 450mm, and the height of the double steps ranges from 100 to 150 mm.
5. A casting method for stably controlling the liquid level of a tundish is characterized in that: the method comprises the following steps:
the method comprises the following steps: pouring molten steel in a first furnace ladle into an A-position transition ladle, and performing argon bottom blowing on the A-position transition ladle to balance the temperature of the molten steel;
step two: pouring the A-position transition ladle molten steel into a tundish, and keeping the liquid level of the tundish stable;
step three: pouring second furnace ladle molten steel into a B-position transition ladle, and carrying out argon bottom blowing on the B-position transition ladle to balance the temperature of the molten steel;
step four: when the balance of the molten steel in the A-position transition ladle is 20%, pouring the molten steel in the B-position transition ladle into a tundish, and controlling the total flow of the molten steel in the A-position transition ladle and the B-position transition ladle to be constant so as to keep the liquid level of the middle Bao Heng for casting production;
step five: after the molten steel in the A-position transition ladle is cast, baking and heating the A-position transition ladle in the empty ladle state;
step six: pouring molten steel of a large ladle of a third furnace into the A-position transition ladle, and when the balance of the molten steel of the B-position transition ladle is 20%, restarting pouring of the A-position transition ladle, and controlling the total flow of the molten steel of the A-position transition ladle and the B-position transition ladle to be unchanged so as to keep the liquid level of the middle Bao Heng for casting production;
step seven: after the molten steel in the B-position transition ladle is cast, baking and heating the B-position transition ladle in an empty ladle state;
step eight: the operation is circulated according to the steps.
6. A pouring method of stable control of the surface of a tundish according to claim 1, wherein: the baking temperature of the A-bit transition packet and the B-bit transition packet in the empty packet state is more than 950 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211207895.7A CN115635072A (en) | 2022-09-30 | 2022-09-30 | Pouring device and method for stably controlling liquid level of tundish |
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| CN202211207895.7A CN115635072A (en) | 2022-09-30 | 2022-09-30 | Pouring device and method for stably controlling liquid level of tundish |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117259767A (en) * | 2023-11-23 | 2023-12-22 | 苏州德普润新材料科技有限公司 | Gas atomization powder preparation system capable of accurately adjusting powder granularity |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117259767A (en) * | 2023-11-23 | 2023-12-22 | 苏州德普润新材料科技有限公司 | Gas atomization powder preparation system capable of accurately adjusting powder granularity |
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