JPH0760420A - Cooling device - Google Patents

Abstract

PURPOSE:To prevent the lowering of cooling capacity by arranging a means for discharging coolant to the outside of the system between the mutually vertically adjacent nozzle lines or at the lower side of the lowermost nozzle. CONSTITUTION:A cast slab 4 is continuously cast in a mold 6. Plural nozzle lines each arranged with plural horizontal or inclined nozzles 1 in a line are formed vertically and the coolant is spouted from these nozzles. Then, internals between the nozzles 1 are set so that the coolant collides against the surface of a cast slab 4 without interfering with each other between the mutually adjacent nozzles 1 when the coolant collides against the surface of the cooling cast slab 4. Further, the coolant flowing on the surface of cast slab 4 after colliding with the slab 4 between the mutually adjacent nozzle 1 lines in the vertical direction or at the lower side of the nozzle 1 line positioned at the lowermost is discharged outside the system through a through 7-1. The gap interval between the through 7-1 and the cast slab 4 is freely controlled by a driving device 7-2. By this method, the coolant spouted from the cooling nozzle can directly collide with the surface of the slab 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a drainer for cooling spray water of a continuous casting machine, and can also be applied to a cooling device in a hot rolling process.

A continuous casting machine will be described below as an example.

[0003]

2. Description of the Related Art One of the main functions of a continuous casting machine is to solidify a molten metal to continuously produce a slab having a prescribed shape.

Therefore, the continuous casting equipment incorporates a mold, a guide roll and a secondary cooling equipment.

The molten metal poured into the mold is cooled from the surface in contact with the mold by the cooling water passing through the mold, forms a solidified shell in the mold, and is then drawn out below the mold.

In this case, the solidified shell is filled with unsolidified molten metal. As a result, after leaving the mold, the solidified shell exhibits deformation (bulging) behavior due to the static pressure of the molten steel.

Therefore, in the continuous casting machine, in order to suppress the bulging behavior and to obtain the prescribed cast shape, the solidified shell is cooled by the secondary cooling device installed immediately below the mold and solidified. In addition to improving the deformation strength of the shell, the guide rolls are used to hold the solidified shell at a specified size and to promote solidification while suppressing bulging deformation.

As a secondary cooling device of a continuous casting machine, a method of spraying cooling water onto a slab by a water spray nozzle or a steam spray nozzle is generally used.

At this time, the cooling water sprayed from the nozzle collides with the slab and removes heat from the slab, part of which evaporates and part of which scatters. It will flow along (Figs. 1-2).

When the cooling water sprayed from the nozzle directly collides with the slab, it is evaporated in the nucleate boiling state to remove heat from the slab. On the other hand, when colliding with the slab and naturally flowing down along the surface of the slab, the cooling water flowing down becomes a water film, and the cooling water evaporates between this water film and the slab.

However, since the evaporation form is a film boiling state, the cooling capacity is lowered.

When the water film of the cooling water flowing down is not eliminated and the water film surface is continuously sprayed from the nozzle, the above cooling is performed unless a collision force for breaking the water film is given to the sprayed cooling water. Deterioration cannot be prevented.

In the case of a continuous casting machine having a normal guide roll, a large number of nozzles are arranged between the guide rolls.

At this time, the water that collides with the slab and flows down along the surface of the slab is blocked by a guide roll arranged downstream, flows along the guide roll and falls from the short side of the slab. become.

Therefore, in this case, there is no phenomenon of impeding the collision of the spray water sprayed from the spray disposed downstream, which flows down along the surface of the slab (FIGS. 3 to 5).
4).

The present inventors previously filed Japanese Patent Application No. 5-127408.
Proposed a casting method in which the guide roll was opened to control the solidified shell shape in a certain range of the continuous casting machine, or a casting method in which the unsolidified molten steel was held only by the solidified shell and no guide roll was used. .

In the continuous casting machine of these systems, it is necessary to take measures against the cooling water flowing down as described above.

[0018]

In a cooling device for spraying a refrigerant from a plurality of cooling nozzles arranged on the same surface, the sprayed refrigerant flows along the surface after colliding with the surface. Refrigerant sprayed from another cooling nozzle installed below does not directly collide with the surface to be cooled, thereby improving the decrease in cooling capacity.

[0019]

The gist of the present invention is to provide a cooling device for ejecting cooling water as a refrigerant from a plurality of cooling nozzles arranged on the same surface. Since the water flows along the surface after colliding with the surface, there is provided a method of preventing a phenomenon in which the flowing water prevents the cooling water ejected from another cooling water nozzle installed on the downstream side from directly colliding with the cast piece. It is a thing.

That is, the present invention is a cooling device in which a plurality of nozzle rows for ejecting a refrigerant are arranged horizontally or inclined and arranged in the same row to form a plurality of rows in the vertical direction, and the nozzle surface is cooled. When the refrigerant collides, the nozzle interval is set so that the refrigerant collides with the object surface without the mutual interference between the adjacent nozzles, and between the nozzle rows that are vertically adjacent to each other, or the nozzle located at the bottom end. The cooling device is characterized in that a means for discharging the refrigerant that has collided and flowed on the surface of the object to the outside of the system, for example, a gutter, is provided below the row.

[0021] With this, the refrigerant that flows down and diffuses along the surface of the object to be cooled is quickly eliminated, and the refrigerant that flows down and diffuses to the other nozzle groups is prevented and jetted from these nozzle groups. The cooling medium can directly collide with the object to be cooled.

The method of ejecting the refrigerant includes spraying the refrigerant, injecting it, and dropping it.

[0023]

Examples FIGS. 5 to 6 show an example in which a gutter-type drainer (cooling elimination device) is provided in the secondary cooling zone of a cast when the guide roll of the continuous caster is not used (continuous caster system). Reference example: Japanese Patent Application No. 5-127408).

In this figure, in order to easily discharge the cooling water flowing on the surface of the long side slab from the surface of the slab, the gutter (7-1) was installed so as to be inclined with respect to the flowing water.

The gutter can freely control the gap between the gutter and the cast piece by a drive device (7-2).

As a method of installing the gutter, it is possible to arrange the gutter in a direction orthogonal to the flowing water, or to arrange it on both sides with an inclination (mountain arrangement).

Alternatively, it is possible to use a flexible roll whose roll is deformed following the pressing surface of the slab.

[0028]

In a cooling device having a large number of cooling nozzles arranged on the same surface, a draining device (refrigerant removing device) for separating the refrigerants ejected from the cooling nozzles arranged in a plurality of rows is arranged. As a result, even if the refrigerant ejected from the nozzle collides with the surface and then flows along the surface, it is properly removed.Therefore, the refrigerant ejected from the cooling nozzle installed in the downflow direction directly collides with the surface. become. As a result, it is possible to prevent deterioration of the cooling capacity.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing the behavior of cooling water during spraying.

FIG. 2 is an explanatory view showing the behavior of cooling water during spraying.

FIG. 3 is an explanatory diagram showing a discharge state of cooling water by a guide roll.

FIG. 4 is an explanatory diagram showing a discharge state of cooling water by a guide roll.

FIG. 5 is an explanatory view showing an embodiment of a gutter-type drainer according to the present invention.

FIG. 6 is an explanatory view showing an embodiment of the gutter-type drainer according to the present invention.

[Explanation of symbols]

 1 Spray Nozzle 2 Spray Range 3 Flowing Water 4 Casting 5 Roll 6 Mold 7-1 Gutter 7-2 Gutter Drive Device

Claims (2)

[Claims] 1. A cooling device in which a plurality of nozzle rows for ejecting a refrigerant are arranged horizontally or inclined and arranged in the same row to form a plurality of rows in the vertical direction, and the refrigerant collides with the surface of a substance to be cooled. At this time, the nozzle interval is set so that the refrigerants between adjacent nozzles collide with the object surface without interfering with each other, and between the nozzle rows adjacent in the vertical direction, or the lower side of the nozzle row located at the bottom end. A cooling device, characterized in that a means for discharging the refrigerant flowing on the surface of the object upon collision to the outside of the system is provided. 2. A cooling device according to claim 1, wherein the means for discharging the refrigerant to the outside of the system is a gutter.