JPH0830219B2 - Strip heat equalizer - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a soaking chamber of a heat treatment furnace for heat treating a strip steel sheet.

[0002]

2. Description of the Related Art Conventionally, in a soaking chamber of a heat treatment furnace, as described in Japan Iron and Steel Institute (88, 89th Nishiyama Memorial Technology Course, page 142, lines 4-8), a radiant tube is used. The heating method is used. This method is
A radiant tube is arranged in parallel with the width direction of the strip steel plate, a burner is installed at one end of the radiant tube, the burner is burned, and the radiant tube is red-heated by the combustion heat of the burner, and is placed in the furnace. It is a method of dissipating heat, supplementing the heat dissipated from the furnace wall, maintaining the temperature of the soaking chamber, and heating and soaking the strip steel.

Further, as disclosed in Japanese Patent Laid-Open No. 60-56025, an electric heater is hooked on a furnace wall of a soaking chamber through a refractory hanger, and the heater is energized to red heat the furnace wall. There is also disclosed a method of supplementing more radiated heat, maintaining the temperature in the soaking chamber, and soaking the strip steel sheet.

[0004]

First, in the case of the radiant tube system, a burner is installed on one side of the radiant tube and an exhaust device for discharging combustion exhaust gas generated from the burner is required on the other side. Therefore, it could be installed only horizontally in the width direction. Therefore, only both sides of the strip can be heated. Further, it is impossible to surround the strip and dispose the radiant tube in a cross beam shape because the exhaust device becomes complicated.

In addition, a heater hanger for stopping the heater is required in equipment for soaking with an electric heater, and since this heater hanger requires insulation and strength, clay bricks are mainly used. Has been done. This heater hanger has the drawbacks that the thermal conductivity and the specific gravity are very large as compared with the surrounding fireproof heat insulating material, the heat dissipation is large, and the startup time at the start of operation is long.

Further, the number of metal objects for supporting the hanger bricks is required to be larger than the number of hanger bricks, and since the metal objects are fixed by the welded structure from the furnace shell, heat dissipation from the furnace shell through the metal objects is prevented. , Very many. The heat conduction area of the metal to the furnace side occupies about 1/3 of the furnace side wall area. Therefore, the amount of welding increases, the equipment cost becomes very high, and the required capacity for supplementing the radiated heat further increases. Also, due to the meandering of the strip, the strip does not come into contact with the heater and the furnace wall and are not damaged,
A protector is required, and the hardware that supports the protector will also be installed on the furnace wall, increasing the amount of heat dissipated and further increasing the required capacity.

[0007]

Means for Solving the Problems Radiation tubes 7 and 8 equipped with electric heaters are arranged at predetermined intervals in a soaking chamber 2 so as to surround a strip in a cross beam shape, and are arranged in this cross beam shape. The strip 6 is passed through the soaking chamber 2 to heat the strip 6 uniformly.

[0008]

The strip heated to a predetermined temperature in the heating chamber is conveyed to the soaking chamber. In the heat equalizing chamber, radiation tubes 7 and 8 equipped with electric heaters are arranged at predetermined intervals in a grid pattern so as to surround the strip. The strip 6 is passed through the soaking chamber to soak it to a predetermined temperature. At this time, the strip 6 heated to a predetermined temperature is transported while maintaining the heating temperature by supplementing the heat radiated from the furnace body by the radiation pipes 7 and 8 arranged in a cross beam shape.

[0009]

1 is a side view of the entire heat treatment furnace showing one embodiment of the present invention, and FIG. 2 is a vertical sectional view of a side portion of a soaking chamber 2.
FIG. 3 is a sectional view taken along line AA of FIG. In FIG. 1, the strip 6 heated to a predetermined temperature in the heating chamber 1 performs a predetermined heat treatment while traveling vertically to the soaking chamber 2, the cooling chambers 3 and 4 via rolls.

In FIG. 3, the strip 6 heated to a predetermined temperature in the heating chamber 1 is conveyed to the soaking chamber. In the soaking chamber, the radiation tubes 7 and 8 equipped with an electric heating heater are installed in a cross pattern on the inner wall of the soaking chamber at a predetermined interval.
The strip 6 passes through the soaking chamber 2 to carry out a predetermined soaking. At this time, only the radiation pipes 7 and 8 penetrate into the soaking chamber 2 from the outside of the furnace toward the inside of the soaking chamber 2.
Only the heat radiated from the penetrating part and the furnace body can dissipate heat, and it can be minimized. In addition, the radiation tube 7,
Since 8 are arranged in the shape of a cross, the radiant heat from the periphery of the furnace body can be efficiently supplemented by the radiant tubes 7 and 8, and not only the effect of soaking both sides of the strip 6 but also the strip Overcooling of both ends can also be prevented.

The radiation pipes 7 and 8 were made by bending a steel plate to a predetermined outer diameter and welding the outer circumference thereof with the same material as the radiation pipes 7 and 8. FIG. 4 shows another embodiment. As shown in FIG. 4, if the radiation tubes 7 and 8 are inserted into each other from the soaking chamber 2 in the furnace length direction, the present invention can be effectively applied even if the furnace length becomes long.

FIG. 5 is a detailed view of a radiation tube applied to the present invention, in which a heat transfer heater 10 is installed in the pipe 9, and the heat transfer heater 10 has an insulator 11 in the pipe 9.
It is supported by 12. Then, one end of the pipe 9 is made blind and sealed with the outside air, and the other end is provided with the flange 1
Install No. 4 and engage with the furnace body. Insulation from the heater is performed by installing an insulating flange 13.

[0013]

As described above, by arranging the radiation pipes in the shape of a cross in the soaking chamber furnace, the amount of hardware attached to the furnace body such as the protector is reduced, and since the hanger brick is not used, heat dissipation is minimized. Since the heat capacity is suppressed, the thermal efficiency is improved, and the heat capacity at the time of heating is reduced, the facility capacity can be greatly reduced, and the facility effect is very large.

[Brief description of drawings]

1 is an overall view of a heat treatment furnace, FIG. 2 is a side sectional view of a soaking chamber of the present invention, FIG. 3 is a sectional view taken along line AA of FIG. 2, and FIG. 4 is another embodiment of the present invention. FIG. 5 is a detailed view of an example of a radiation tube applied to the present invention.

[Explanation of symbols]

1: heating chamber, 2: soaking chamber, 3, 4: cooling chamber, 5:
Roll, 6: Strip steel plate, 7, 8: Radiant tube, 9: Pipe, 10: Electric heater, 11: Insulator, 12: Insulator, 13: Insulation flange, 14: Flange.

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Sumio Nishimoto 46-59, Nakahara, Tobata-ku, Kitakyushu City, Fukuoka Prefecture Nippon Steel Co., Ltd. Machinery & Plant Division (56) Reference JP-A-63-206432 A) Japanese Patent Publication Sho 56-15710 (JP, B2)

Claims (1)

[Claims] 1. A steel plate, equipped with an electric heater, in a soaking chamber of a heat treatment furnace for passing a strip 6 into a heat treatment furnace comprising a heating chamber, a soaking chamber and a cooling chamber, and heat treating the strip 6. A soaking device for strips, characterized in that the radiant tubes 7 and 8 made of steel are arranged at predetermined intervals in a grid pattern so as to surround the strip in the soaking chamber 2 furnace.