CN213002610U - Tundish with long service life for steelmaking - Google Patents

Abstract

The application discloses long life steelmaking is with middle package includes: the bag comprises a bag body, an impact plate and a flow stabilizer, wherein the top surface of the bag body is open, and a cavity is arranged inside the bag body; the first side of the cavity is a blanking area, and a bottom plate of the blanking area is provided with an impact plate; a current stabilizer is arranged on the top surface of the impact plate; the second side of the cavity is a drainage area, and a plurality of water gaps are arranged on the drainage area at intervals; the top surface of the impact plate is provided with a flow stabilizer which can change the flow velocity of the molten steel, slow down the impact force of the large ladle on the impact area of the molten steel on the bottom of the tundish and slow down the flow velocity of the molten steel. After improvement, the service life of the tundish can reach 52 hours, and the bottom impact plate structure is still intact.

Description

Tundish with long service life for steelmaking

Technical Field

The application relates to a tundish with long service life for steelmaking, belonging to the field of steelmaking.

Background

The service life of the tundish directly influences the continuous casting rate of a casting machine, the refractory cost of the tundish, the head and tail amount of a casting machine blank, the starting and stopping times of the casting machine and the accident rate of the casting process, and the method for prolonging the service life of the tundish is the most effective and direct method for reducing consumption in continuous casting. The tundish is a shunting container used for receiving molten steel poured from a ladle, and the molten steel is distributed into each crystallizer through each water gap arranged on one side of the tundish after passing through the tundish, so that shunting of the molten steel is realized.

The service life of the existing tundish is influenced by the scouring capability of molten steel borne by a tundish impact plate and the erosion speed of an upper nozzle, and in the using process, the service life of the tundish is mainly influenced by the following two factors: the first is that the bottom of the tundish is thin, the bottom of the tundish is stressed greatly, and the temperature of molten steel impacting a water gap is high, so that the diameter of the water gap on the tundish is continuously increased under the scouring of the molten steel, and the service life of the tundish is influenced by the redness of the water gap;

and secondly, the impact point is single when the tundish is used, and the single impact point can accelerate the erosion speed of the impact plate, so that the service life of the impact plate is only 40 hours, and the erosion is finished.

The service life of the conventional tundish is about 40 hours. The impact plate in the impact area is seriously eroded, if the erosion cannot be found in time, the phenomenon of tundish penetration and leakage is easily caused, and a major accident is caused.

With the continuous capacity expansion of steel mills to improve the yield, the existing tundish structure can not meet the continuous scouring of a large amount of molten steel under the yield condition, and the service life is less than 40 hours. In the prior art, the impact plate is made of impact-resistant and erosion-resistant materials; adding an impact plate again yields little.

SUMMERY OF THE UTILITY MODEL

The application provides a tundish for steelmaking with long service life, which is used for solving the problem that the service life of the tundish in the prior art is short; the erosion speed of the upper water gap and the lower water gap on the inner wall of the bag body is too high; the problem that the existing tundish structure cannot adapt to long-term safe operation with high productivity is solved.

The application provides a long life steelmaking is with middle package includes: the bag comprises a bag body, an impact plate and a flow stabilizer, wherein the top surface of the bag body is open, and a cavity is arranged inside the bag body; the first side of the cavity is a blanking area, and a bottom plate of the blanking area is provided with an impact plate; a current stabilizer is arranged on the top surface of the impact plate;

the second side of the cavity is a drainage area, and a plurality of water gaps are arranged on the drainage area at intervals;

the current stabilizer is of a cylinder structure, the top surface of the cylinder is open, and a steel water layer is arranged in the cylinder.

Preferably, the method comprises the following steps: the zirconium core drainage cylinders are arranged in the water gaps; the top surface of the zirconium core drainage tube (30) extends out of the upper water port surface of the top surface of the bottom plate.

Preferably, the bottom surface of the zirconium core drainage tube extends out of the bottom surface of the bottom plate.

Preferably, the bottom plate is trapezoidal, and the blanking area is arranged on the first side of the bottom plate; the drainage area is arranged on the second side of the bottom plate; the first side area is less than the second side area.

Preferably, the enclosure comprises: the bottom plate and the side retaining walls enclose a cavity; the periphery of the bottom plate is provided with a side retaining wall which is vertical to the bottom plate.

Preferably, the method comprises the following steps: the infrared thermal imager, the inclusion sets up in infrared thermal imager's detection range.

Preferably, the method comprises the following steps: support and display: the support sets up in middle package one side, and the infrared thermal imager is installed on the support to be connected with the display electricity.

The beneficial effects that this application can produce include:

1) the application provides a long life is package in middle of making steel sets up the current stabilizer on the impingement plate top surface, can change the molten steel velocity of flow, slows down the big package at the impact strength of molten steel to middle package bottom impact area, slows down the molten steel velocity of flow. After improvement, the service life of the tundish can reach 52 hours, and the bottom impact plate structure is still intact.

2) The application provides a long service life steelmaking is with middle package, through establishing the zirconium core in inserting in the mouth of a river, and zirconium core top surface is higher than the mouth of a river periphery to reduce the mouth of a river and rubed, delay the mouth of a river erosion, increase of service life.

3) The application provides a long service life is package in middle of steelmaking is used, used current regulator structure nearly seems in the cask shape, moreover, the steam generator is simple in structure, only need hold at the current regulator cavity and set up the molten steel layer, utilize the impact of molten steel layer buffering bale molten steel to middle package bottom, thereby improve middle package life-span, extension current regulator life, the smooth of package molten steel has also been changed to barreled current regulator, need not to set up the slag trap and can realize promoting inclusion come-up in the steel, the pure degree of package molten steel in the improvement, can effectively simplify middle package structure.

Drawings

FIG. 1 is a schematic top view of a long-life steel-making tundish provided by the present application;

fig. 2 is a schematic front view of a current regulator provided in the present application;

FIG. 3 is a schematic front view of a nozzle as provided herein;

Detailed Description

The present application will be described in detail with reference to examples, but the present application is not limited to these examples.

Referring to fig. 1, the long-life tundish for steelmaking provided by the present application includes: the bag comprises a bag body 10, an impact plate 20 and a flow stabilizer 21, wherein the top surface of the bag body 10 is open, and a cavity is arranged inside the bag body 10; the first side of the cavity is a blanking area 11, an impact plate 20 is arranged on the bottom plate of the blanking area 11, and a current stabilizer 21 is arranged on the top surface of the impact plate 20; the second side of the cavity is a drainage area 12, and a plurality of water gaps are arranged on the drainage area 12 at intervals; the current stabilizer 21 is of a cylinder structure, the top surface of the cylinder is open, and a steel water layer 22 is arranged in the cylinder.

The flow stabilizer 21 used in the tundish is similar to a bucket shape, a certain molten steel layer 22 is kept in the tundish for a long time, the molten steel layer 22 is used for buffering the impact of the large ladle molten steel on the bottom of the tundish, so that the service life of the tundish is prolonged, the barreled flow stabilizer 21 also changes the smoothness of the tundish molten steel, and under the condition of not using a slag blocking layer, the tundish can realize the promotion of floating of inclusions in steel and improve the purity of the tundish molten steel.

The service life of the tundish provided by the application is effectively prolonged preferably, and the service life of the tundish comprises: the zirconium core drainage tubes 30 are arranged in the water gap; the top surface of the zirconium core drainage tube 30 extends out of the upper water gap 31 surface of the top surface of the bottom plate. The inner wall of the water gap is protected by arranging the zirconium core drainage cylinder 30, and meanwhile, the zirconium core drainage cylinder 30 extends out of the top surface of the bottom plate to protect the 31 surfaces of the water gap on the top surface of the bottom plate, so that the service life of a tundish is prolonged, and the phenomenon that the diameter of the water gap 31 is expanded due to molten steel scouring is avoided.

Preferably, the bottom surface of the zirconium core drainage tube 30 extends out of the bottom surface of the bottom plate. According to the arrangement, the zirconium core drainage tube 30 can protect the water outlet, so that erosion is avoided, and the service life of the tundish is prolonged.

Preferably, the bottom plate is trapezoidal, and the blanking area 11 is arranged on the first side of the bottom plate; the diversion area 12 is arranged on the second side of the bottom plate; the first side area is less than the second side area. The arrangement can provide more flow areas for the molten steel to flow, and is convenient for flowing out and guiding to different crystallizers.

Preferably, the bag 10 comprises: the cavity is enclosed by the bottom plate and the side retaining walls; the periphery of the bottom plate is provided with a side retaining wall which is vertical to the bottom plate.

By increasing the length of the zirconium core drainage cylinder 30 to 13mm, a blocking effect is provided for the flowing of molten steel, the erosion of high-temperature molten steel to the upper nozzle 31 can be effectively reduced, the scouring effect of the molten steel on the upper nozzle 31 when flowing through the upper nozzle 31 is reduced, the service life of the tundish is prolonged, the red-emitting condition of the lower nozzle can be avoided, and the steelmaking quality is improved. After the existing tundish is used for a long time, the diameter of a drainage opening is obviously enlarged; the tundish water outlet provided by the application is obviously expanded, so that the water outlet can be effectively prevented from being eroded by molten steel, and the service life of a tundish is prolonged.

In the specific embodiment, after the length of the tundish water feeding port 31 is improved, the service life of the tundish is obviously prolonged from 40 hours to 48-50 hours. The tundish is off-line, the service condition of the tundish is checked, and dry materials of a slag line part and an impact area are corroded normally; the impingement plate 20 erodes normally; the upper nozzle 31 is opened, the diameter of the upper nozzle 31 is expanded normally, and the requirement of the tundish on the service life of 48 hours is met

In the specific embodiment, the service life of the tundish is prolonged from 40 hours to 50 hours and is up to 55 hours after the impact plate 20 is changed into the flow stabilizer 21. The tundish is off-line, the service condition of the tundish is checked, and dry materials of a slag line part and an impact area are corroded normally; the impingement plate 20 erodes normally; the service life requirement of the tundish for 48-50 hours is met, and the service life of the tundish is up to 55 hours.

Meanwhile, slag discharging of the tundish slag is enhanced, the thickness of the tundish slag layer is measured and checked every day, and the team where the tundish slag layer is located is checked when the thickness exceeds a specified value, so that the erosion degree of the tundish slag to a tundish slag line position can be further reduced, the liquid level height of the tundish is also improved, the impact strength of molten steel in an impact area to the bottom of the impact plate 20 is relieved, the erosion speed of the impact plate 20 is reduced, and the service life of the tundish is prolonged.

In a specific embodiment, 1 is through improving the middle package life-span, and the average middle package use amount of continuous casting reduces 3 ~ 4 middle packages every month, and a middle package cost is about 1.8 ten thousand yuan, directly practices thrift: 1.8 × 12 × 4 ═ 86 ten thousand yuan.

2, the head and the tail of a blank of nearly 4-5 tons can be caused by one start-up and shut-down each time, and the price difference between the waste blank and the qualified blank is calculated according to 400 yuan: 5 × 400 × 4 × 12 ═ 9.6 ten thousand dollars total savings: 86+9.6 become 95 ten thousand yuan, adopt this technical scheme, can effectively practice thrift the cost, under the technological improvement cost condition of returning the end, realize longer life.

After the device is adopted to prolong the service life of the tundish, the head and tail quantity of the casting blank can be reduced, the residual steel quantity of the tundish is reduced, the yield of the casting blank is increased, and the steel consumption is reduced.

Preferably, the method comprises the following steps: infrared thermal imager, inclusion 10 sets up in infrared thermal imager's detection range. Through setting up the infrared thermal imager, can acquire the heat change of each part of inclusion 10 in real time, in time discover the inclusion 10 bottom high temperature condition, effectively monitor inclusion 10 and use, avoid because the middle package local transition corrodes the back, inefficacy causes the incident, improves production security.

Preferably, the method comprises the following steps: support and display: the support sets up in middle package one side, and the infrared thermal imager is installed on the support to be connected with the display electricity.

The temperature change of each part in the use process of the tundish can be displayed in real time through the display, so that monitoring personnel can conveniently implement visual monitoring on the use of the tundish.

The infrared thermal imager used in the application is an SDM1400 type industrial temperature measurement infrared thermal imager produced by Shanghai Duntai imaging technology Limited.

Reference throughout this specification to "one embodiment," "another embodiment," "an embodiment," "a preferred embodiment," or the like, means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment described generally in this application. The appearances of the same phrase in various places in the specification are not necessarily all referring to the same embodiment. Further, when a particular feature, structure, or characteristic is described in connection with any embodiment, it is submitted that it is within the scope of the disclosure to effect such feature, structure, or characteristic in connection with other embodiments.

Although the present application has been described herein with reference to a number of illustrative embodiments thereof, it should be understood that numerous other modifications and embodiments can be devised by those skilled in the art that will fall within the spirit and scope of the principles of this disclosure. More specifically, various variations and modifications are possible in the component parts and/or arrangements of the subject combination arrangement within the scope of the disclosure and claims of this application. In addition to variations and modifications in the component parts and/or arrangements, other uses will also be apparent to those skilled in the art.

Claims (7)

1. A long life steelmaking tundish, characterized by comprising: the bag comprises a bag body (10), an impact plate (20) and a flow stabilizer (21), wherein the top surface of the bag body (10) is open, and a cavity is arranged inside the bag body (10); the first side of the cavity is a blanking area (11), and a bottom plate of the blanking area (11) is provided with an impact plate (20); a current stabilizer (21) is arranged on the top surface of the impact plate (20);

the second side of the cavity is a drainage area (12), and a plurality of water gaps are arranged on the drainage area (12) at intervals;

the flow stabilizer (21) is of a cylinder structure, the top surface of the cylinder is open, and a steel water layer (22) is arranged in the cylinder.

2. The long-life steelmaking tundish according to claim 1, comprising: a plurality of zirconium core drainage cartridges (30), the zirconium core drainage cartridges (30) being mounted in the nozzle; the top surface of the zirconium core drainage tube (30) extends out of the upper water gap (31) surface of the top surface of the bottom plate.

3. The tundish for steelmaking with a long service life as claimed in claim 2, wherein the bottom surface of the zirconium core draft tube (30) extends out of the bottom surface of the bottom plate.

4. The long-life steelmaking tundish according to claim 1, wherein the bottom plate is trapezoidal, and the blanking zone (11) is provided on a first side of the bottom plate; the diversion area (12) is arranged on the second side of the bottom plate; the first side area is less than the second side area.

5. The long-life steelmaking tundish according to claim 1, wherein the ladle body (10) comprises: the cavity is enclosed by the bottom plate and the side retaining walls; the periphery of the bottom plate is provided with a side retaining wall which is vertical to the bottom plate.

6. The long-life steelmaking tundish according to claim 1, comprising: an infrared thermal imager, a bag body (10) is arranged in the detection range of the infrared thermal imager.

7. The long-life steelmaking tundish according to claim 1, comprising: support and display: the support sets up in middle package one side, and the infrared thermal imager is installed on the support to be connected with the display electricity.

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