JPS606422Y2 - Riser pipe for heating furnace - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a riser pipe for a heating furnace provided for supporting a skid pipe on which steel pieces are placed in a heating furnace for steel manufacturing.

Generally, in a heating furnace for steelmaking, a steel billet 1, which is an object to be heated, is transported by a skid rail 2 disposed on a skid pipe 3, as shown in FIG.

Further, the skid pipe 3 is supported by a riser pipe 4 arranged vertically from the hearth.

On the other hand, in order to protect the skid pipe 3 and the riser pipe 4 from the high temperature inside the furnace, cooling water is flowing inside each pipe 3, 4, and the riser pipe 4 is arranged as described above. Therefore, another inner pipe 5 is provided inside the pipe to form a so-called double pipe structure, so that the water is allowed to flow along the route shown by the arrows a-b-c.

Further, the skid pipe and riser pipe 4 are wrapped with a fireproof material (not shown).

However, in the riser pipe 4 having the above structure, the internal temperature is low (50°C in the case of water cooling) in order to maintain the strength of the pipe 4.
℃), so the temperature inside the furnace (1200-1300℃)
There was a disadvantage that there was a significant difference in temperature, and the heat loss due to the temperature difference was significant.

Furthermore, water is normally used as a cooling medium, but in this case, sufficient cooling of the riser pipe 4 cannot be expected if there is significant damage such as water scale or corrosion, for example, if the inner pipe 5 is severely corroded. Therefore, there was a risk of damage caused by insufficient strength.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a riser pipe for a heating furnace that has low heat loss and can prevent the occurrence of limescale, corrosion, etc.

According to the present invention, a riser pipe for a heating furnace has an inner pipe that supplies a cooling medium, an intermediate pipe that surrounds this inner pipe, supports a skid pipe, and has a hole in the upper part, and an intermediate pipe that surrounds and protects this intermediate pipe. The cooling medium is supplied from the inner pipe to the gap between the intermediate pipe and the outer pipe through the gap between the inner pipe and the intermediate pipe and the hole in the upper part of the intermediate pipe.

The present invention will be described in detail below with reference to the accompanying drawings.

FIG. 2 is a sectional view showing an embodiment of a riser pipe for a heating furnace according to the present invention.

This riser pipe is composed of an inner pipe 10, an intermediate pipe 11, and an outer pipe 12.

The inner pipe 10 supplies a cooling medium (air in this embodiment).

The intermediate pipe 11 surrounds the inner pipe 10 and supports a skid pipe 13 on which a heated steel piece is placed.

On the other hand, a small hole 14 is provided in the upper part of the intermediate pipe 11.

The outer pipe 12 protects the intermediate pipe 11 from the high temperature inside the furnace, and is provided so as to surround the intermediate pipe 11.

Note that the outer pipe 12 is located at a location where its lower end 12a is not affected by the high temperature inside the furnace (where it penetrates the hearth (not shown)).
It has a length of up to .

Also, most of the air supplied from the inner pipe 10 flows along the path shown by the arrows A-B-C, and a part of it flows through the small hole 14 at the top of the intermediate pipe 11 in the path shown by the arrows. It is discharged outside the furnace.

Note that a fireproof material (not shown) is wrapped around the skid pipe 13 and the outer pipe 12.

In the riser pipe for a heating furnace configured as described above, the gap 15 between the intermediate pipe 11 and the outer pipe 12 serves as a buffer between the high-temperature inside of the furnace and the low-temperature inside of the intermediate pipe 11, reducing heat loss that was previously significant. It is possible to do so.

Note that although the outer pipe 12 has a relatively high temperature, this pipe 12 is not expected to play a strong role (the skid pipe 12 is supported by the intermediate pipe 11).
Therefore, there is no problem with strength reduction due to high temperatures.

Further, in FIG. 2, the small holes 14 are provided on the same circumference of the intermediate pipe 11, but it is also possible to provide the small holes 14 at different levels as shown in FIG. 3.

Note that, considering the strength influence that the small hole 14 has on the intermediate pipe 11, the position of the small hole 14 in the embodiment shown in FIG. 3 is preferable.

Furthermore, since the intermediate pipe 11 and the outer pipe 12 are connected to the skid pipe 13 which is cooled separately, the upper portions of the intermediate pipe 11 and the outer pipe 12 are both at low temperatures.

Therefore, the height of the small hole 14 of the intermediate pipe 11 can be freely determined within the range of influence of the skid pipe 13.

Note that in this example, air was used as the cooling medium, but
Of course, other cooling media may be used.

As explained above, according to the present invention, heat loss can be reduced and energy savings can be achieved.

Furthermore, since air can be used as a cooling medium, defects such as corrosion can be eliminated, and effects such as extending the life of the riser pipe for a heating furnace can be expected.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional riser pipe for a heating furnace, Fig. 2 is a sectional view showing one embodiment of the riser pipe for a heating furnace according to the present invention, and Fig. 3 is another embodiment of the main part according to the present invention. FIG. 1... Steel piece, 2... Skid rail,
3,13...Skid pipe, 4...
Riser pipe, 5゜10...Inner pipe, 11
...Middle pipe, 12...Outside pipe, 14...Small hole.

Claims (1)

[Scope of utility model registration request] A first pipe that supplies a cooling medium, a second pipe that surrounds this first pipe, supports a skid pipe on which a heated object is placed, and has a hole in its upper part; a third pipe surrounding the pipe, and a cooling medium is supplied from the first pipe to the gap between the second and third pipes through the gap between the first and second pipes and the hole. A riser pipe for a heating furnace characterized by: