JPS5938845B2 - Slab insulation device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a slab heat-retaining device in a slab yard, and particularly to a heat-retaining device in a slab yard that temporarily retains high-temperature cast slabs that are continuously cast and supplied.

For example, when producing thick plates or hot-rolled coils, hot steel slabs that are ingotted, bloomed, or continuously cast during the steelmaking process are heated to the desired temperature in a -temperature heating furnace. After that, it is sent to a rolling process and rolled into a desired size.

In this case, the slab sent from the slab supply line is
Before loading into the heating furnace, the slabs are temporarily (for several hours or more) stored in a stacked state in a slab storage area called a slab yard.

For this reason, the slabs placed in the slab yard at high temperatures are left to cool while they remain there, and the capacity of the next heating furnace must be increased.

Therefore, if the slab is kept as warm as possible in the slab yard, the burden on the subsequent heating furnace will be reduced accordingly, and the benefits in terms of energy conservation will be greater.

However, in the past, no substantial proposals have been made regarding heat retention in slab yards, and the current situation is that insufficient measures have been taken, such as simply covering the stacked slabs with covers.

In particular, in recent years, the slabs fed from the continuous casting process are subjected to a large reduction in the width direction before the hot rolling process, and even if the slabs of a certain size are cast in the continuous casting process, this medium-thick reduction process is not enough. A method has been proposed in which the size of the slab is adjusted to match the dimensions of the final product and the slab is sent to a hot rolling process.

In this method as well, the slabs whose width dimensions have been adjusted are retained in the slab yard according to the processing position of each product, so the temperature of the slab in the slab yard is large, and it is also important to keep this warm from an energy saving perspective. It's important.

The inventors of the present invention have conducted various studies on slab insulation in slab yards, which has not been attempted in the past, and have discovered a unique insulation device that takes into consideration the points described below. It becomes possible,
We were able to achieve significant energy savings from the existing heating furnace.

That is, in order to measure the slab heat retention rate in the slab yard, the following points must be considered.

■ The slab yard is a tong crane operation, so it is necessary to avoid interference with the tong crane as much as possible with the slab insulation device.

■ In the slab yard, one pile is not completed instantly but in two or three batches, so it is necessary to open and close the heat insulating device each time.

Therefore, in order to improve the heat retention effect, it is necessary to quickly attach and remove the heat retaining cover.

■ Considering the flow of the slab and the transition route of the tong crane, the insulation device must be laid out in a logical manner to avoid wasted space.

■ The slabs delivered to the slab yard are at high temperatures (800℃).
Therefore, it is desirable to use equipment that can perform all operations unmanned as much as possible.

The object of the present invention is to provide a slab heat-insulating device that satisfies all of the above points and is very advantageous in terms of heat-insulating effect, workability, and cost.

Another object of the present invention is to provide a slab heat retention device that can save energy in the next stage heating furnace by increasing the heat retention effect in the slab yard.

Furthermore, another object of the present invention is to provide a slab heat retention device particularly suitable for application to a system in which a continuous casting process and a hot rolling process are directly connected.

The structural feature of the slab insulation device of the present invention to achieve these objectives is that a movable heat insulation cover that is quickly and remotely operated between the slab stacking position and the standby position in the slab yard is arranged. That's the point.

The moving direction of the movable heat-retaining cover crosses the moving direction of the tong crane and does not interfere with each other, and the structure of the cover is sized to sufficiently cover the width and height of a predetermined number of stacked slabs. It is formed into a box or dome shape with an open bottom and an open or openable lid on one longitudinal side.

Furthermore, the heat insulating cover is a movable trolley that runs on a rail installed between the slab stacking position and the standby position.

On opposite end sides, approximately parallel to the direction of movement of the movable thermal cover in the slab yard, there are connected slab supply lines (e.g. conveyor table communicating with the steel mill) and supply lines to the slab rolling process (e.g. heating furnace, etc.). A conveyor table leading to the rolling mill) is provided at each of the rolling mills.

The present invention will be described in detail below based on embodiments shown in the drawings.

FIG. 1 shows a specific example of a layout centered around a slab yard to which the heat retention device of the present invention is applied.

In the figure, 1 indicates, for example, an ingot making/blooming process or a continuous casting process in a steel factory, which is a process for manufacturing a desired slab.

2 is a roller table for carrying in the slab from the slab manufacturing process 1, 3 is a slab yard provided following the roller table 2, and 4 is a roller table in a direction substantially perpendicular to the transport direction of the roller table 2 in the slab yard 3. A plurality of movably arranged slab transfer lanes (for example, tong cranes); 5 is a first slab storage area where the crane 4 piles up a predetermined number of slabs; 6 is adjacent to the first slab storage area 5; A slab unloading roller table 7, which is installed almost parallel to the slab loading roller table 2, is a heating furnace connected to the terminal end side of the roller table 6, and a heating furnace 7 is connected to the exit side of the heating furnace 7 for the next continuous hot rolling process. A roller table 8 is connected in order to send the material to the.

In addition, 30 is a slab care yard provided on the side opposite to the slab yard of the slab carry-in roller table 2, 9 is a slab piler attached on the line of the slab carry-in roller table 2,
10 is a slab depiler (pusher) attached to the slab unloading roller table 6.

Further, 11 is the first slab storage area 5 of the slab yard 3.
12 is a second slab storage area located further back from the
13 is a heating furnace connected to the roller table 12; 14 is a roller table connected to the exit side of the heating furnace 13; The roller table 14 continues to the next plank manufacturing process.

In this way, in the layout shown in FIG. 1, a carry-in line following the slab manufacturing process 1 is provided at one end of the slab yard 3, and a slab carry-out line for the continuous hot rolling process is provided in the middle of the slab yard 3. At the other end opposite to the slab carrying-in line, another slab carrying-out line leading to the thick plate manufacturing process is provided, and these slab carrying-in lines and two slab carrying-out lines are arranged parallel to each other, and furthermore, they are arranged almost orthogonally to these lines. A plurality of lanes are provided for the transfer of slabs, and two slab storage areas are set up close to each slab delivery line.

Of course, the present invention is not limited to the layout shown in FIG. 1, and a layout modified as appropriate may be adopted, and the number of slab delivery lines may also be one.

In the present invention, for example, the first
and second slab storage areas 5 and 11 are arranged side by side in the direction of crane movement as shown in the figure, and slab loading from the slab storage area,
A certain amount of space is taken on one side in the direction of the carry-out line, and a self-propelled heat retaining cover 15 is installed there.

One self-propelled heat retaining cover 15 is installed for each slab pile.

Rails 16 are installed on both sides of each slab pile in each slab storage area 5, 11 to allow a self-propelled heat insulating cover 15 to run in the direction of the slab loading/unloading line. This is an example of the relationship between heat insulating covers, and the slab storage area is made up of a slab mounting table 18 that is made by tightly packing heat insulating materials 17 such as sand, ballast, etc. in the form of granules, blocks, or plates. The slabs S are stacked.

The self-propelled heat retaining cover 15 is formed in a box shape with openings on the lower surface, longitudinal direction, and side surfaces, and is driven by a travel motor 19, and has a lid 20 attached to one open side that can be opened and closed.

The lid 20 is raised and lowered by a winch 20 mounted on the lid.

The heat retaining cover 15 moves back and forth between the slab storage area and the retreat position via the rails 16 and wheels 22, and surrounds or exposes the piled slabs S.

The operation of the self-propelled heat retaining cover 15 and the lid 20 is controlled remotely from, for example, the operator's cab of a tong crane.

Further, the main body of the heat retaining cover 15 may be constructed by reinforcing the heat insulating material with a framework.

Note that the lid 20 is not limited to what is shown in the drawings, but if there is no interference with the crane, a method that moves up and down in the vertical direction, or a method other than a one-sided shutter method, a method of opening and closing using a cylinder with one side pivoted on the cover, etc. may be adopted as appropriate. good.

Furthermore, the shape of the cover body is not limited to a box shape, but can also be configured into a dome shape.

FIG. 3 shows another example of a self-propelled heat retaining cover 15 that closes one side.1, the heat retaining cover 15 itself is not provided with a lid, and the heat retaining cover 15 is moved for a period of time T. The side surface of the cover collides with the fixed wall 23 at the position where the slab S is covered and is closed.

This fixed wall 23 also serves as a stopper for positioning the heat retaining cover 15.

In addition, in the slab storage areas 5 and 11 in FIG. 1, an example of one heat insulation cover for one slab pile is shown,
In the present invention, two slab mountains may be covered at the same time with one long cover, or a pair of covers 15 with the slab S sandwiched in between, one of which is narrower, as shown in Fig. 4A.
A and 15b may be installed facing each other and inserted into the slab S from both sides to cover the slab S, or the fixed wall 23a may be configured to be narrower than the width of the heat retaining cover 15 as shown in the opening in Fig. 4. is also possible.

The case shown in FIG. 4 has the advantage of being able to accommodate changes in the length of the slab S.

In any case, the form of the heat retaining cover 15 may be selected as appropriate depending on the layout and space of various equipment, mainly the slab yard.

Next, the present invention will be explained in detail based on the layout of FIG.

The high-temperature slabs S manufactured to a required size in the slab manufacturing process 1 are supplied to the slab yard 3 by a carry-in roller table 2, and are stacked in predetermined numbers by a piler 9 and temporarily placed.

The tong crane 4 usually grabs and suspends a plurality of slabs and transports them to the next slab storage area 5 or 11 in the slab yard 3.

At the same time as the slab S is placed in the slab storage area, a signal is sent to the self-propelled heat retaining cover 15 which is waiting according to its position and is immediately driven to cover the slab.

It is necessary to accurately stop the heat retaining cover 15, for example, by electrical means or mechanical means.

The heat insulating cover 15 covering the slab either closes the lid 20 in response to a signal or automatically closes the sides by the fixed wall 23.

Since slabs are not stacked in one slab storage area in one crane operation, the heat retaining cover 15 is moved back and forth each time a new pile of slabs is piled up to cover the slabs.

In this way, slabs are stacked one after another in the slab storage area 6.11 of the slab yard 3, and each pile of slabs is covered with a heat insulating cover 15 to retain heat for a predetermined period of time.

After the predetermined residence time has elapsed, the slab S is covered with a heat retaining cover 15.
Reverse the depiler 1 using the tong crane 4 again.
0 and extruded onto the next transport roller table 6 for sending to the hot rolling process, or fed onto another unloading roller table 12 for sending to the plate manufacturing process.

The slab heated to the desired temperature in the heating furnace 7 or 13 is
It is sent to a hot rolling process or a plate manufacturing process and processed into the desired product.

As described above, the slabs S in the slab yard 3 are covered with the heat retaining cover 15 during their residence, so that heat dissipation can be suppressed to some extent, and the amount of heat can be reduced when the slabs are sent to the next heating furnace and heated. I can do it.

According to experiments conducted by the present inventors, for example, a slab at 950°C (
Size: width 1050mm, thickness 250mm, length 10m
) When stacking 8 slabs and leaving them in the slab yard for 5 hours, a self-propelled heat insulating cover according to the present invention (space size inside the slab storage in the experimental example: width 2.4 m, length 13.9 m) was used.
When comparing the case where the slab was kept warm at a height of 3.3 m) and the case without a cover, the temperature of the slab after residence was approximately 750°C without a cover, whereas with the heat insulating cover of the present invention At that time, the slab temperature was about 850°C, and it was recognized that the slab temperature was improved by about 100°C.

As explained above, according to the heat retention device of the present invention, it is possible to effectively and efficiently retain the heat of slabs in the slab yard, so it becomes possible to retain the heat of the slabs in the slab yard, which was previously unthinkable. Temperature drop can be suppressed as much as possible.

Therefore, the burden on the heating furnace after the slab yard is reduced,
The benefits in terms of energy conservation are extremely large.

Furthermore, the layout of the slab insulation device in the slab yard can be rationalized, work efficiency can be improved, and existing equipment can be used almost as is.

[Brief explanation of the drawing]

FIG. 1 is a schematic plan view showing an example of the overall arrangement of the slab heat insulating device according to the present invention, and FIGS. 2 and 3 are perspective views showing a specific example of the self-propelled heat insulating cover used in the present invention. Figure A is a schematic plan view showing another embodiment of the heat retaining cover used in the present invention. 1... Slab manufacturing process, 2... Loading roller table, total... Slab yard, 4...
... Tong crane, 5, 11 ... Slab storage area, 6 ... Slab unloading roller table, 7 ...
...Heating furnace, 8...Roller table, 9...
...Piler, 10...Depiler, 1
2...Roller table, 13...Heating furnace, 14...Roller table, 15...
・Self-propelled thermal cover, 16...Rail, 17・
...Heat insulation material, 18...Slab mounting stand, 1
9... Travel motor, 20... Lid, 22
...Wheel, 23...Fixed wall, 30...
... Slab care yard.

Claims (1)

[Claims] 1. A slab yard is provided between the terminal end of the high-temperature slab supply line and the starting end of the slab rolling process supply line, and the slabs are sequentially stacked within the slab yard by a crane moving in a direction intersecting the two lines. Set up a stacking point, lay rails on both sides of the slab stacking point that are almost parallel to the two lines above, and install a movable heat-retaining cover that runs on the rails and covers the entire stacked slabs. This is a slab heat retention device that is characterized by: