CN113042721B

CN113042721B - Dam-shaped vortex-resisting device for bottom of ladle

Info

Publication number: CN113042721B
Application number: CN202110277327.3A
Authority: CN
Inventors: 黄君; 刘孟; 谢辉; 杨新泉; 秦世民; 唐中队
Original assignee: Wuhan Iron and Steel Co Ltd
Current assignee: Wuhan Iron and Steel Co Ltd
Priority date: 2021-03-15
Filing date: 2021-03-15
Publication date: 2022-03-25
Anticipated expiration: 2041-03-15
Also published as: CN113042721A

Abstract

The invention discloses a dam-shaped vortex-resisting device for the bottom of a ladle, which is integrally a cuboid block, the total thickness a is 150-350 mm, the total height b is 400-850 mm, the total width d is 350-650 mm, the thickness direction is front and back, the width direction is left and right, semicircular stabilizing grooves which are penetrated front and back are symmetrically arranged between the upper bottom edges of the left and right surfaces and the position j, the radius e of the stabilizing grooves is 50-130 mm, the left and right surfaces above the position j are symmetrical and narrow-down equilateral inclined planes along the line, the width i of the narrowed top surface is 300-500 mm, the left and right sides of the front surface above the position j are symmetrical and equilateral upper chamfers along the line and vertical lower chamfers below the position j, the lower end of the upper chamfers is connected with the lower chamfers, the upper end inclines to the center of the top surface, the upper chamfers and the lower chamfers are equal in thickness and the thickness f is 50-100 mm, the thickness c is 100-250 mm when the lower chamfers are not counted, the width g of the lower chamfers is 50-150 mm, the height of the j position is 250-400 mm. By adding the device at the bottom of the steel ladle, the critical height of the steel ladle slag discharging can be effectively reduced, and the slag discharging amount of the steel ladle in the tail period is reduced.

Description

Dam-shaped vortex-resisting device for bottom of ladle

Technical Field

The invention belongs to the technical field of steelmaking continuous casting, and particularly relates to a dam-shaped vortex-resisting device for the bottom of a ladle.

Background

The steel ladle is a container used for containing molten steel and refining and pouring in a continuous casting process flow, and in the production process of continuous casting steel, after furnace slag containing iron oxide, manganese oxide and silicon oxide in the steel ladle flows into a tundish, the furnace slag can cause the burning loss of easily oxidized alloy elements such as aluminum, titanium and the like in the molten steel and generate alumina inclusions, thereby affecting the cleanliness of the molten steel and easily causing the surface quality problem of steel products, and alumina inclusions in the molten steel can cause the nozzle blockage and also affect the flow field in a crystallizer and the continuous casting furnace number of the tundish. In order to prevent slag in the ladle from entering the tundish, steel grades with strict cleanliness requirements, such as automobile plates, are produced in steel factories by using ladle steel retaining operation, so that the quality requirement is met, but the yield of molten steel is low. At present, how to improve the yield of molten steel in the process of pouring steel ladles is a difficult problem which troubles many steel plants, and how to take measures to weaken or even eliminate confluent vortex is the key point for controlling the slag discharging of steel ladles and improving the yield of the molten steel. Therefore, the development of a ladle slag control device with high efficiency and low cost is very important and urgent.

In the traditional method for controlling slag falling of a ladle, CN205110763U discloses a slag ball for preventing vortex slag entrapment of the ladle, the slag ball is composed of a solid sphere and a refractory material layer coated outside the solid sphere, the cross section of the position of the refractory material layer provided with two grooves passes through the sphere center of the slag ball, the diameter of the slag ball is 170 plus 190mm, and the slag ball is reported to be capable of effectively eliminating vortex slag entrapment of the ladle; CN106588005A discloses a refractory material for homogeneous slag-stopping balls for continuous casting steel ladles and a method for manufacturing the slag-stopping balls, wherein the composition of the refractory material comprises 262-80 wt% of ZrO, 314-32 wt% of Al2O, 22-6 wt% of SiO 2-4 wt% of SiC, and 3.0-6.5 wt% of silica sol, and the refractory material is reported to effectively prevent slag in the ladles from entering a tundish; CN209477279U discloses a slag-rolling-preventing ladle masonry structure, which is an inclined ladle bottom, wherein a funnel-shaped groove is concavely arranged on the inner wall of the ladle bottom, a ladle nozzle is communicated with the lowest point of the groove, the top end of a lower nozzle is lower than the bottom of the ladle wall of a ladle body by 5cm, and the report shows that the flowing speed difference of molten steel and steel slag in a short time is increased through the funnel-shaped bottom, so that the residual steel amount is reduced; CN104525929A discloses a method for controlling slag discharging of a steel ladle through argon blowing through a steel-ladle bottom ring steel-tapping hole, wherein an annular air brick with the air width of 50-300 mm is arranged around the steel-ladle bottom steel-tapping hole, and in the process of steel-ladle pouring, when the height of the liquid level of molten steel pouring in the steel ladle is 150-400 mm, the argon blowing pressure is controlled to be 0.2-0.7 MPa, so that argon is blown into the molten steel through the annular air brick, and slag discharging of the steel ladle is controlled.

From the above, the current slag discharging control mainly focuses on magnetic field detection control and inclined-plane ladle bottom structure control, the magnetic field detection can only judge the slag discharging time and cannot effectively reduce the slag discharging amount, and the existing inclined-plane ladle bottom structure can only improve the molten steel yield to a certain extent.

Disclosure of Invention

The invention aims to provide a dam-shaped vortex-resisting device for the bottom of a ladle, which can effectively reduce the slag-discharging critical height of ladle slag by adding the device at the bottom of the ladle, thereby reducing the slag-discharging amount of the ladle in the tail period.

The technical scheme adopted by the invention is as follows:

a dam-shaped vortex-resisting device for the bottom of a ladle is a cuboid block, the whole body is 150-350 mm in total thickness a, 400-850 mm in total height b and 350-650 mm in total width d, the thickness direction is front and back, the width direction is left and right, semicircular stabilizing grooves which are through from front to back are symmetrically arranged between the upper bottom edges of the left and right sides and the position j, the radius e of each stabilizing groove is 50-130 mm, the left and right sides above the position j are symmetrical and narrow-down equilateral inclined planes along the line, the width i of the narrowed top surface is 300-500 mm, the left and right sides of the front surface above the position j are symmetrical and equilateral upper chamfers along the line, the lower chamfers are symmetrical and vertical lower chamfers below the position j, the lower ends of the upper chamfers are connected with the lower chamfers, the upper ends of the chamfers incline towards the center of the top surface, the upper chamfers and the lower chamfers are equal in thickness f and 50-100 mm, the thickness c is 100-250 mm when the lower chamfers are not counted, the width g is 50-150 mm, the height of the j position is 250-400 mm.

Further, during installation, the lower part of the dam-shaped vortex-resisting device used for the bottom of the ladle is poured to the bottom of the ladle to be fixed, and the pouring depth M is 180-350 mm, is larger than the height of the stabilizing groove and is smaller than the height of the position j.

Further, during installation, an included angle beta between the dam-shaped vortex blocking device used at the bottom of the ladle and the center of the water gap relative to the center of the ladle is 15-35 degrees, and the size of the included angle beta is adjusted according to the distance L from the center of the water gap to the center of the ladle.

The invention has the beneficial effects that:

by adding the device at the bottom of the steel ladle, the critical height of the steel ladle slag discharging can be effectively reduced, so that the slag discharging amount of the steel ladle in the tail period is reduced, and the method is more direct and effective compared with the existing slag control method.

Drawings

Fig. 1 is a perspective view of a dam type vortex suppression device for the bottom of a ladle in the embodiment of the invention.

Fig. 2 is a front view of fig. 1.

Fig. 3 is a side view of fig. 1.

Fig. 4 is a bottom view of fig. 1.

FIG. 5 is a view showing the installation position of the dam type vortex breaker for the bottom of the ladle in the embodiment of the present invention.

Fig. 6 is a cross-sectional view of fig. 5.

FIG. 7 is a slag-resisting effect diagram of a dam-type vortex-resisting device used at the bottom of a ladle in the embodiment of the invention.

Detailed Description

The invention is further described below with reference to the figures and examples.

As shown in figures 1 to 4, a dam-shaped vortex-resisting device for the bottom of a ladle, the whole body is a cuboid block, the total thickness a is 150 to 350mm, the total height b is 400 to 850mm, the total width d is 350 to 650mm, the thickness direction is front and back, the width direction is left and right, semicircular stabilizing grooves which are penetrated front and back are symmetrically arranged between the upper bottom edges of the left and right surfaces and the position j, the radius e of the stabilizing grooves is 50 to 130mm, the left and right surfaces above the position j are symmetrical and narrow-down equilateral inclined planes along the line towards the top surface, the width i of the narrowed top surface is 300 to 500mm, the left and right sides of the front surface above the position j are symmetrical and equilateral upper chamfers along the line, the lower chamfers are symmetrical and vertical below the position j, the lower end of the upper chamfers are connected with the lower chamfers, the upper chamfers incline towards the center of the top surface, the upper chamfers and the lower chamfers have the same thickness and the thickness f is 50 to 100mm, the thickness c is 100 to 250mm when the lower chamfers are not included, the width g of the lower chamfer is 50-150 mm, and the height at the j position is 250-400 mm.

As shown in figures 2 and 6, during installation, the lower part of the dam-shaped vortex-resisting device used at the bottom of the ladle is poured to the bottom of the ladle to be fixed, and the pouring depth M is 180-350 mm, is greater than the height of the stabilizing groove and is less than the height of the position j.

As shown in figures 5 and 6, during installation, an included angle beta between the dam-shaped vortex retarding device used at the bottom of the ladle and the center of the nozzle relative to the center of the ladle is 15-35 degrees, and the included angle beta is adjusted according to the distance L from the center of the nozzle to the center of the ladle.

Examples

A dam type hinders whirling device for ladle bottom: the total thickness a is 280mm, the total height b is 620mm, the total width d is 500mm, the thickness direction is taken as front and back, the width direction is taken as left and right, semicircular stabilizing grooves which are penetrated back and forth are symmetrically arranged between the upper bottom edges of the left and right surfaces and the position j, the radius e of the stabilizing grooves is 70mm, the left and right surfaces are symmetrical equilateral inclined planes along the line which are narrowed towards the top surface above the position j, the width i of the narrowed top surface is 360mm, the left and right sides of the front surface are symmetrical upper chamfers which are equilateral along the line above the position j and are symmetrical and vertical lower chamfers below the position j, the lower end of each upper chamfer is connected with the lower chamfer, the upper end of each upper chamfer inclines towards the center of the top surface, the upper chamfer and the lower chamfer are equal in thickness, the thickness f is 70mm, the thickness c is 210mm when the lower chamfer is not counted, the width g of the lower chamfer is 70mm, and the height at the position j is 320 mm; during installation, the lower part is poured to the bottom of the ladle to be fixed, the pouring depth M is 260mm, and the included angle beta between the pouring depth M and the center of the water gap relative to the center of the ladle is 19 degrees. The numerical simulation result of the device is shown in fig. 7, the critical slag lowering height of the device can be reduced by 23.5% compared with the device which is not added, so that the critical slag lowering height of the ladle slag can be effectively reduced by adding the device at the bottom of the ladle, the slag lowering amount of the ladle in the tail period is reduced, and the method is more direct and effective compared with the existing slag control method.

It will be understood that modifications and variations can be made by persons skilled in the art in light of the above teachings and all such modifications and variations are intended to be included within the scope of the invention as defined in the appended claims.

Claims

1. A dam type vortex-resisting device for the bottom of a ladle is characterized in that: the whole body is a rectangular block, the total thickness a is 150 to 350mm, the total height b is 400 to 850mm, the total width d is 350 to 650mm, the thickness direction is taken as the front and back, the width direction is taken as the left and right, semicircular stabilizing grooves which are penetrated in the front and back are symmetrically arranged between the upper bottom edges of the left and right sides and the position j, the radius e of each stabilizing groove is 50-130 mm, the left and right sides above the position j are symmetrical and are equilateral inclined planes along the line, the width i of the narrowed top surface is 300-500 mm, the left and right sides of the front surface above the position j are symmetrical and are equilateral upper chamfers along the line, the positions below the position j are symmetrical and vertical lower chamfers, the lower ends of the upper chamfers are connected with the lower chamfers, the upper ends of the upper chamfers incline to the center of the top surface, the upper chamfers and the lower chamfers have the same thickness and have the thickness f of 50-100 mm, the thickness c when the lower chamfers are not counted on the bottom surface is 100-250 mm, the width g of the lower chamfers is 50-150 mm, and the height at the position j is 250-400 mm.

2. The dam-type vortex suppression device for the bottom of the ladle as claimed in claim 1, wherein: during installation, the lower part of the dam-shaped vortex-resisting device used for the bottom of the ladle is poured to the bottom of the ladle to be fixed, and the pouring depth M is 180-350 mm, is greater than the height of the stabilizing groove and is less than the height of the j position.

3. The dam-type vortex suppression device for the bottom of the ladle as claimed in claim 1, wherein: during installation, an included angle beta between the dam-shaped vortex-resisting device used at the bottom of the ladle and the center of the water gap relative to the center of the ladle is 15-35 degrees, and the size of the included angle beta is adjusted according to the distance L from the center of the water gap to the center of the ladle.