CN108637199B - Method for reducing molten steel temperature of first-furnace ladle for pouring of tundish - Google Patents
Method for reducing molten steel temperature of first-furnace ladle for pouring of tundish Download PDFInfo
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- CN108637199B CN108637199B CN201810565951.1A CN201810565951A CN108637199B CN 108637199 B CN108637199 B CN 108637199B CN 201810565951 A CN201810565951 A CN 201810565951A CN 108637199 B CN108637199 B CN 108637199B
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- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/10—Supplying or treating molten metal
- B22D11/11—Treating the molten metal
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Abstract
A method for reducing the molten steel temperature of a first ladle for pouring a tundish belongs to the technical field of steel continuous casting; the method comprises the following steps: 1) before pouring of the tundish, when first furnace molten steel is poured into the tundish, inert gas is blown into the molten steel in the tundish through the air-permeable nozzle brick at the bottom of the tundish; 2) continuously blowing inert gas to improve the temperature of the molten steel within 6cm above the tundish air-permeable nozzle pocket brick by 5-8 ℃, wherein the temperature of the molten steel is uniform; in the blowing process, the blowing pressure and flow are adjusted along with the height of the liquid level in the tundish within the pressure and flow range specified in the step 1, and the slight fluctuation of the liquid level of the molten steel is suitable; 3) stopping blowing the inert gas after the molten steel liquid level in the tundish reaches the specified height and the tundish starts normal open pouring; according to the method, argon is blown in when the first furnace of molten steel for pouring the tundish is poured into the tundish, so that the temperature of the first furnace of molten steel for pouring the tundish is effectively reduced, the production cost is reduced, the economic benefit is improved, and the method is more suitable for field application.
Description
Technical Field
The invention belongs to the technical field of steel continuous casting, and particularly relates to a method for reducing molten steel temperature of a first ladle of a pouring box casting.
Background
When the tundish is not poured, the temperature in the tundish is lower because the temperature of the lining of the tundish belongs to a 'cold' tundish. When the tundish is started to cast, high-temperature molten steel enters the tundish, and the inner lining of the tundish absorbs a part of heat, so that the temperature of the molten steel in the tundish is reduced more than that of the molten steel for normal casting, the fluidity of the molten steel is deteriorated due to the reduction of the temperature of the molten steel, steel condensation is easy to occur at the water port of the tundish, and the water port is blocked or even stops casting accidents are caused. In order to prevent the nozzle from being blocked by the cold steel due to the reduction of the molten steel temperature at the nozzle of the tundish and ensure the smooth casting process, the temperature of the molten steel in the first furnace ladle for casting the tundish is higher than that of the continuous casting furnace, so that a large amount of energy consumption is caused, the production cost is increased, and how to reduce the temperature of the molten steel in the first furnace ladle for casting the tundish is a common problem troubling the field production.
At present, two methods are mainly adopted to ensure the smooth pouring process and improve the molten steel temperature of a first ladle poured by a tundish. One is to increase the temperature of the ladle molten steel during the refining stage, for example, by heating with electrodes during the refining process. The method has the advantages that the cost is high, the energy consumption is high, the molten steel temperature of the first furnace ladle for pouring the tundish is accurately ensured to be increased in the refining stage, and the temperature rise of other continuously poured ladles is avoided, so that the on-site scheduling requirement is high, and the molten steel temperature of the first furnace ladle for pouring the tundish is difficult to meet the requirement due to the scheduling rhythm limit in the common production process.
The other type is that heating equipment is additionally arranged in the tundish, for example, the molten steel temperature of a first ladle poured from the tundish is increased by using methods such as plasma or induction heating. But the method has larger reconstruction on the tundish and high cost of equipment reconstruction; after the first furnace ladle molten steel is poured into the tundish, a large amount of energy can be consumed by heating the molten steel in the tundish, and the production cost can be greatly increased. At present, no effective method for economically reducing the molten steel temperature of a first ladle for pouring a tundish is available for iron and steel enterprises in the pouring process of the tundish.
Disclosure of Invention
Aiming at the problem of reducing the molten steel temperature of the first furnace ladle of the pouring of the tundish and the defects of the prior art, the invention provides a method for reducing the molten steel temperature of the first furnace ladle of the pouring of the tundish. Based on the consideration of production cost, the invention fully combines the actual field production, and blows inert gas into the tundish through the air-permeable nozzle pocket brick at the bottom of the tundish, thereby improving the molten steel temperature of the first furnace ladle poured by the tundish, effectively preventing the nozzle from being blocked due to the cooling and cold bonding of the molten steel at the bottom of the tundish, reducing the molten steel temperature of the first furnace ladle poured by the tundish, reducing the cost and greatly improving the economic benefit.
A method for reducing the molten steel temperature of a first ladle for pouring a tundish specifically comprises the following steps:
step 1: before pouring of the tundish, when first furnace molten steel is poured into the tundish, inert gas is blown into the molten steel in the tundish through the air-permeable nozzle brick at the bottom of the tundish; wherein: the pressure at which the inert gas is blown in is: 0.2 to 0.4MPa, and a flow rate of 1 to 20Nm3/h；
Step 2: continuously blowing inert gas to improve the temperature of the molten steel within 6cm above the tundish air-permeable nozzle pocket brick by 5-8 ℃, wherein the temperature of the molten steel is uniform; in the blowing process, the blowing pressure and flow are adjusted along with the height of the liquid level in the tundish within the pressure and flow range specified in the step 1, and the slight fluctuation of the liquid level of the molten steel is suitable;
and step 3: and stopping blowing the inert gas after the molten steel liquid level in the tundish reaches the specified height and the tundish starts normal open pouring.
The method for reducing the molten steel temperature of the first ladle for pouring the tundish is characterized in that:
in the method, the inert gas is argon.
In the method, the air blowing time is 2-5 min.
In the step 1, pouring molten steel in a first furnace ladle in a tundish refers to: when the tundish is cast in the continuous casting process, molten steel in a first furnace ladle in the tundish is cast, the molten steel in the ladle is cast in the tundish, and after the molten steel in the tundish reaches a certain height, a steel outlet of the tundish is opened to start casting.
In the step 1, inert gas is blown into the molten steel to promote the stirring of the molten steel, so that the temperature of the molten steel above the air-permeable nozzle brick cup is increased.
In the step 2, the gas pressure and flow are controlled in the blowing process, and the slight fluctuation of the liquid level of the molten steel is preferably used. When molten steel of a first furnace steel ladle is just poured into a tundish, the liquid level in the tundish is lower, and in order to avoid the condition that the molten steel is cooled due to blowing off the liquid level, the blowing pressure and flow rate need to be controlled not to be too large; after the molten steel in the tundish reaches a certain height, the effect of blowing and stirring the molten steel is ensured, and the blowing pressure and the flow are not too small. In the whole blowing process, the blowing pressure and the flow are adjusted along with the height of the liquid level in the tundish within the control range of the blowing pressure and the flow provided by the patent, and the slight fluctuation of the liquid level of the molten steel is suitable.
In the step 2, the gas flow is controlled during the inert gas blowing process, preferably, the liquid level of the molten steel slightly fluctuates, so as to ensure that the molten steel is not cooled due to excessive stirring.
And in the step 2, the inert gas is continuously blown in, the temperature of the molten steel is increased and is uniform, so that the molten steel cannot be cooled and condensed, and the molten steel is guaranteed to be poured normally.
In the step 3, the molten steel level in the tundish reaches the specified height, which is the molten steel level temperature in the tundish when the tundish is cast.
Compared with the prior art, the method for reducing the molten steel temperature of the first ladle for pouring the tundish has the advantages and beneficial effects that:
according to the invention, when the first furnace of molten steel of the tundish is poured into the tundish, argon is blown in, so that the flow of the molten steel at the bottom of the tundish is promoted, the fluidity of the molten steel is improved, and the condition that a water gap is blocked due to the cooling and condensation of the molten steel at the bottom of the tundish is effectively prevented, so that the temperature of the molten steel of the first furnace of molten steel of the tundish is effectively reduced, the energy consumption and the resource waste are reduced, the cost is reduced, and the economic benefit is improved; the invention fully combines the actual field production, does not need to be controlled by field scheduling, aims at pouring the molten steel of the first furnace ladle of the tundish, improves the temperature of the molten steel and saves manual operation by blowing inert gas at the bottom, and simultaneously, compared with other complex equipment for heating the molten steel, the invention has the advantages of low cost, small energy consumption, simple and convenient operation and obvious benefit, and is more suitable for field application.
Drawings
FIG. 1 is a schematic view of a tundish bottom blowing system in an embodiment of the invention.
In the figure, 1, a tundish; 2. a gas-permeable nozzle pocket brick; 3. a pressure gauge; 4. a flow meter; 5. and (4) a valve.
Detailed Description
The invention is further illustrated by the following examples and drawings, but is not limited thereto.
Example 1:
a method for reducing the temperature of molten steel in a first ladle of a pouring basket is disclosed, as shown in figure 1, and the pouring basket used in the embodiment is 30 tons.
Step 1: before pouring of the tundish, when the first furnace molten steel is poured into the tundish, inert gas is blown into the molten steel in the tundish through the air-permeable nozzle brick cup at the bottom of the tundish. Wherein: the pressure at which the inert gas is blown in is: 0.2MPa, flow rate of 1-5 Nm3/h；
Step 2: and continuously blowing inert gas to improve the temperature of the molten steel in 6cm right above the tundish air-permeable nozzle pocket brick by 5-8 ℃. The gas flow is controlled in the blowing process, and the slight fluctuation of the liquid level of the molten steel is preferably used.
And step 3: the molten steel liquid level in the tundish reaches the specified height, and the inert gas is stopped blowing in after the tundish is normally opened for pouring.
In this embodiment, the air blowing time is controlled to be 2 min.
In this embodiment, the superheat degree Δ T of the molten steel in the first ladle of the tundish cast in the original process is 25 ℃. By adopting the process parameters, the superheat degree delta T of the molten steel of the first furnace ladle for pouring the tundish is 19 ℃, the superheat degree is reduced by 6 ℃, and the blockage phenomenon of the nozzle of the tundish caused by cold steel is avoided.
Example 2:
a method for reducing the temperature of molten steel in a first ladle of a pouring basket is disclosed, and as shown in figure 1, the pouring basket used in the embodiment is 40 tons.
Step 1: before pouring of the tundish, when the first furnace molten steel is poured into the tundish, inert gas is blown into the molten steel in the tundish through the air-permeable nozzle brick cup at the bottom of the tundish. Wherein: the pressure at which the inert gas is blown in is: 0.3MPa, flow rate of 8-12 Nm3/h；
Step 2: and continuously blowing inert gas to improve the temperature of the molten steel in 6cm right above the tundish air-permeable nozzle pocket brick by 5-8 ℃. The gas flow is controlled in the blowing process, and the slight fluctuation of the liquid level of the molten steel is preferably used.
And step 3: the molten steel liquid level in the tundish reaches the specified height, and the inert gas is stopped blowing in after the tundish is normally opened for pouring.
In this embodiment, the air blowing time is controlled to be 3.5 min.
In this embodiment, the superheat degree Δ T of the molten steel in the first ladle of the tundish cast in the original process is 30 ℃. By adopting the process parameters, the superheat degree delta T of the molten steel of the first furnace ladle for pouring the tundish is 22.5 ℃, the superheat degree is reduced by 7.5 ℃, and the blockage phenomenon of the nozzle of the tundish caused by cold steel condensation does not occur.
Example 3:
a method for reducing the temperature of molten steel in a first ladle of a pouring basket is disclosed, as shown in figure 1, and the pouring basket used in the embodiment is 50 tons.
Step 1: before pouring the tundish, blowing inert gas into molten steel in the tundish through the air-permeable nozzle brick at the bottom of the tundish when pouring first furnace molten steel into the tundishA gas. Wherein: the pressure at which the inert gas is blown in is: 0.4MPa, flow rate of 15-20 Nm3/h；
Step 2: and continuously blowing inert gas to improve the temperature of the molten steel in 6cm right above the tundish air-permeable nozzle pocket brick by 5-8 ℃. The gas flow is controlled in the blowing process, and the slight fluctuation of the liquid level of the molten steel is preferably used.
And step 3: the molten steel liquid level in the tundish reaches the specified height, and the inert gas is stopped blowing in after the tundish is normally opened for pouring.
In this embodiment, the air blowing time is controlled to be 5 min.
In this embodiment, the superheat degree Δ T of the molten steel in the first ladle of the tundish cast in the original process is 35 ℃. By adopting the process parameters, the superheat degree delta T of the molten steel of the first furnace ladle for pouring the tundish is 27 ℃, the superheat degree is reduced by 8 ℃, and the blockage phenomenon of the nozzle of the tundish caused by cold steel is avoided.
Finally, it should be noted that the above embodiments are only used for illustrating the technical solutions of the present invention and are not limited. Although the present invention has been described in detail with reference to the embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (1)
1. A method for reducing the molten steel temperature of a first ladle for pouring a tundish is characterized by comprising the following steps:
step 1: before pouring of the tundish, when first furnace molten steel is poured into the tundish, inert gas is blown into the molten steel in the tundish through the air-permeable nozzle brick at the bottom of the tundish; wherein: the inert gas is blown into the reactor by argon, and the pressure of the inert gas is as follows: 0.1 to 0.5MPa, and a flow rate of 1 to 20Nm3/h；
Step 2: continuously blowing inert gas to improve the temperature of the molten steel within 6cm above the tundish air-permeable nozzle pocket brick by 5-8 ℃, wherein the temperature of the molten steel is uniform; in the blowing process, the blowing pressure and flow are adjusted along with the height of the liquid level in the tundish within the pressure and flow range specified in the step l, and the slight fluctuation of the liquid level of the molten steel is suitable;
and step 3: stopping blowing the inert gas after the molten steel liquid level in the tundish reaches the specified height and the tundish starts normal open pouring; wherein the time from the start of the inert gas blowing to the stop of the inert gas blowing is controlled to be 2-5 min.
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| CN115138832B (en) * | 2021-03-29 | 2024-01-09 | 宝山钢铁股份有限公司 | Method for prolonging number of pure steel pouring furnaces based on molten steel weight information |
| CN114082908A (en) * | 2021-11-20 | 2022-02-25 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for reducing temperature of molten steel in casting furnace |
| CN115007845B (en) * | 2022-06-15 | 2024-03-15 | 攀钢集团攀枝花钢铁研究院有限公司 | Drainage sand filling method in high-clean steel production process |
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| US3822735A (en) * | 1969-07-11 | 1974-07-09 | Nat Steel Corp | Process for casting molten silicon-aluminum killed steel continuously |
| US4987949A (en) * | 1988-07-29 | 1991-01-29 | Hitachi Zosen Corporation | Protective cover for surface of molten steel used in continuous casting apparatus |
| JP3078561B2 (en) * | 1990-05-24 | 2000-08-21 | 川崎製鉄株式会社 | How to control molten steel temperature |
| JP2891270B2 (en) * | 1991-10-21 | 1999-05-17 | 株式会社神戸製鋼所 | Spontaneous opening method of water pool in tundish |
| CN2609688Y (en) * | 2003-03-14 | 2004-04-07 | 唐山钢铁股份有限公司 | Continuous casting tundish water gap |
| CN101824510B (en) * | 2010-05-14 | 2012-06-13 | 东北大学 | Argon blowing method at bottom of steel ladle for continuously casting steel |
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