JPH10148477A - Seal structure of lifting door in billet heating furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the durability of the door part of a billet-heating furnace equipped with an elevator type door. SOLUTION: The sealing structure of this elevator type door has a water gutter 15 at the top of the wall at the end of a passage opening 2 for processed material in the furnace body 1 of a billet-heating furnace T and a water-cooled box 16 as an integral part on the outer side of an outer furnace fitting 15a which forms the water gutter 15. When the elevator type door 6 for opening and closing the passage opening 2 is lowered, a skirt part 9 of a seal cover 8 provided in the upper part of the door, which skirt part 9 goes down, is designed to be submerged in the water W in the gutter.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sealing structure for a lifting door in a billet heating furnace.

[0002]

2. Description of the Related Art Conventionally, in a billet heating furnace T provided with a lifting door, as shown in FIG.
Opening for processing material, for example, furnace end wall 3 of extraction opening 2
A water-cooled linter 4 having a double-pipe configuration, and a sand gutter 5 provided above the water-cooled linter 4, and metal fittings directed inward and downward on the furnace above the elevating door 6 for opening and closing the extraction opening 2. A seal cover 8 having a skirt portion 9 is provided, and when the door 6 is lowered (closed), the skirt portion 9 of the seal cover 8 is immersed in the sand S in the sand gutter 5 to form a furnace by a so-called sand seal. The high-temperature atmosphere inside is prevented from flowing out of the furnace. Reference numeral 10 denotes a water-cooled pipe.

[0003]

However, in order to prevent the seal cover 8 from being damaged by the contact with the furnace end wall 3 when the liftable door 6 is opened and closed (elevated), the seal cover 8 needs to be closed when the door 6 is closed. As shown in FIG.
A space (not shown) is also provided between the door body 7 and the furnace end wall 3, and the furnace high-temperature gas passes through the space and the space 11. It gushes into 5 parts of the sand gutter. Therefore, the refractory facing the space 11 through which the furnace high-temperature gas passes, the hardware of the skirt portion 9 and the sand gutter 5, particularly the outer metal 5a constituting the sand gutter 5
Were burned in a short time and often had to be repaired. In addition, since the sand S in the sand gutter 5 is scattered by the jet of the high-temperature gas in the furnace, there is a problem that the sealing property cannot be secured for a long time. SUMMARY OF THE INVENTION An object of the present invention is to provide a seal structure of a liftable door in a billet heating furnace that can solve the above problem with a simple configuration.

[0004]

In order to achieve the above object, according to the present invention, in a sealing structure of a liftable door in a billet heating furnace, water is provided on an upper end wall of a processing material passage opening of the furnace body. A gutter is provided, and a water-cooling box is integrally provided outside the outer metal fittings forming the water gutter, and when the door is lowered, a skirt portion directed downwardly of a seal cover provided on an upper portion of the door is provided with a water cooling gutter. 1 is a seal structure of a lifting door in a billet heating furnace which is immersed in a slab.

[0005]

Next, an embodiment of the present invention will be described with reference to FIGS. As is clear from comparison with FIG. 3, in the present invention, the sand gutter 5 is a water gutter 15 and the seal structure is a water seal, and a water cooling box 16 is provided outside the outer metal fitting 15a constituting the water gutter 15. Since other configurations are the same, the same portions are denoted by the same reference numerals and description thereof will be omitted. That is, the water gutter 15 uses the water-cooled linter 4 having the double pipe structure as a bottom member,
It is composed of a part of the furnace shell and the outer hardware 15a of the furnace end wall 3, in which water W is stored, and a water cooling box 16 is integrally provided outside the outer hardware 15a.

The water gutter 15 is formed separately as shown in FIG. 2 without using the water-cooled linter 4 or a part of the furnace shell as described above, and this is formed by the water-cooled linter 4. It may be arranged above. When the extraction opening 2 is closed by lowering the door 6 by well-known elevating means (not shown), the skirt 9 of the seal cover 8
5 in water W. The outer end of the water gutter 15 is cooled by a water cooling box 16. Therefore, the in-furnace high-temperature gas ejected to the water gutter 15 through the space 11 is prevented from flowing out of the furnace, and the hardware of the skirt portion 9 and the outer metal 15a of the water gutter 15 are distorted by heat. Burnout of the refractory in this portion is reduced.

Although the water W in the water gutter 15 evaporates, unlike the conventional sand S, it can be easily and appropriately replenished.
The seal structure can be applied to a charging door (not shown).

[0008]

As is apparent from the above description, according to the present invention, a method of sealing a vertically movable door in a billet heating furnace is as follows.
In addition to the water seal method, a water cooling box was provided outside the outer metal fittings constituting the water gutter to cool this part, so the high temperature atmosphere inside the furnace squirted from between the door and the end wall of the furnace Since the metal parts that make up the skirt and water gutter of the seal cover are cooled by water and are relatively low in temperature, they do not thermally deform, and the refractories around the water cooling box are less likely to be damaged, reducing maintenance. Can be achieved. In addition, because of the water seal method, the cooling water can be appropriately replenished, and the sealing property can be maintained for a long time.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a principal part showing a seal structure of a lifting door in a billet heating furnace according to the present invention.

FIG. 2 is an essential part cross-sectional view showing a modification of FIG. 1;

FIG. 3 is a cross-sectional view of a main part showing a seal structure of a lifting door in a conventional billet heating furnace.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Furnace main body, 2 ... Opening for processing material passage, 3 ... Furnace end wall, 6
... Elevating door, 8 ... Seal cover, 9 ... Skirt, 11
... space, 15, 15A ... water gutter, 15a ... furnace outside hardware, 1
6 ... water cooling box, W ... water.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Masami Michizaki 1-1, Niwahata-cho, Tobata-ku, Kitakyushu-shi, Fukuoka Nippon Steel Corporation Yawata Works (72) Inventor Yasuo Narusei Tobata, Kitakyushu-shi, Fukuoka 1-1 Niwahata-ku, Nippon Steel Corporation Yawata Works

Claims (1)

[Claims] 1. A sealing structure for a lifting door in a billet heating furnace, wherein a water gutter is provided above an end wall of a processing material passage opening of the furnace main body, and an outside of a furnace outer metal part forming the water gutter. A water cooling box provided integrally with the slab, wherein a downwardly extending skirt portion of a seal cover provided on an upper portion of the door is immersed in the water of the water gutter when the door is lowered. Sealing structure of the elevator door in the furnace.