JPH08127825A - Self-fluxing furnace - Google Patents

Abstract

PURPOSE: To provide a self-fluxing furnace which can restrain the erosion of the inner wall of the furnace caused by high temp. gas flow and has good cooling efficiency. CONSTITUTION: This self-fluxing furnace is connected with a cylindrical shaft 2 and a box type settler 1. A water cooling jacket 6 set as annular state and concentrically with the shaft is provided at the lower part 5 of the shaft 2 connected with the settler roof part, and the whole surface of this water cooling jacket at the side wall in the inside of the furnace and the inner wall of the settler roof part are integrally joined by covering with castable refractory 7 so that the side wall in the inside of the furnace becomes almost vertical state. By this method, the erosion loss caused by heat is reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flash furnace in which a cylindrical shaft and a box setler are connected.

[0002]

2. Description of the Related Art A conventional flash furnace of this type is shown in FIG. 4, for example, a box-shaped setler 01, a cylindrical shaft 02 erected on one side of its ceiling portion, and a drawing. Although omitted, it consists of a cylindrical uptake that is erected on the other side of the setler ceiling. A lower end portion 05 of the shaft 02 is formed in a divergent shape from the upper side to the lower side, and a copper pipe 04 for cooling is embedded inside the lower end portion 05. The lower end portion 05 is joined to an H-shaped steel 012 that suspends and supports the ceiling portion of the setler 01. The ceiling of the setler 01 is made of refractory brick 03.

[0003]

By the way, in the conventional flash furnace, since the lower end portion 05 of the shaft 02 is formed in a divergent shape from the upper side to the lower side, the flow of the high temperature gas in the furnace is increased by the arrow. The inner wall of the lower end 05 of the shaft 02 and the inner wall of the ceiling of the setler 01 are severely melted due to this high temperature gas flow.
The copper pipe 04 in the lower end 05 of 02 may be exposed and water may leak into the furnace.Therefore, it is not only necessary to perform repairs at regular annual repairs, but also repairs during operation may be forced. It was In addition, the H-shaped steel 012 also had a problem of melting and thinning.

In addition to the above, there is also a flash furnace in which the lower end of the shaft is made of refractory bricks, and the refractory bricks are cooled by a water cooling jacket attached to the back surface (outer surface) thereof. However, there was a problem that the brick was thick and the cooling was insufficient, resulting in a large amount of brick damage.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to solve the above-mentioned conventional problems and to provide a self-fluxing furnace which can suppress melting damage of the furnace inner wall due to a high temperature gas flow and which has a good cooling efficiency. To do.

[0006]

In order to achieve the above object, the invention of claim 1 is a water-cooling furnace in which a lower end of a shaft connected to a setler ceiling is annularly arranged concentrically with the shaft in a flash furnace. It has a jacket, and the entire inner wall of the water-cooling jacket inside the furnace and the inner wall of the setler ceiling are covered with castable refractory so that the inner side wall of the furnace is almost vertical and are integrally joined to the setler ceiling. .
According to a second aspect of the present invention, in the first aspect, the shaft outer shell is disposed outside the water cooling jacket, and the heat insulating material is filled in the annular gap formed between the outer shell outer shell and the setler ceiling. In addition, an H-shaped cooling body having a cooling structure is annularly arranged near the annular gap on the setler ceiling outside the heat insulating material.

[0007]

With the above structure, the hot gas in the furnace flows almost vertically through the lower end of the shaft, then changes its direction horizontally and flows toward the uptake. In addition, the inner wall of the lower end of the shaft and the inner wall of the ceiling of the setler will not be crushed and damaged. In addition, the castable refractory on the entire inner wall of the furnace of the water cooling jacket is sufficiently cooled, so that the heat-induced melting is small and repair can be partially performed.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a partially cutaway front view of a flash furnace according to an embodiment of the present invention, FIG. 2 is a cross-sectional plan view taken along the line II--II of FIG. 1, and FIG. The enlarged vertical front view of the joining part of the ceiling part of a ra is shown. 1 is a box-shaped setler,
Reference numeral 2 denotes a cylindrical shaft that is erected on one side of the ceiling portion, and a lower end portion 5 connected to the setler ceiling portion (made of refractory bricks 3 etc.) of the shaft is concentric with the shaft 1. It has a water cooling jacket 6 arranged at. Although not shown, the water cooling jacket 6 is provided with a water cooling water channel inside a flat copper block, and is arranged over the entire surface of the shaft 1 in the circumferential direction. A castable refractory 7 is disposed on the entire inner wall of the furnace of the water cooling jacket 6 and the inner wall of the ceiling of the setler so that the inner wall of the furnace is substantially vertical, whereby the lower end 5 of the shaft 1 and the setler. The ceiling is integrally joined. The castable refractory 7 is constructed by attaching castable stoppers to a water cooling jacket or H-shaped steel 12 as appropriate. Further, a shaft outer shell 8 is disposed outside the water cooling jacket 6, and a heat insulating material (for example, Fineflex manufactured by Nichias Co., Ltd. in an annular gap 10 formed with the setler ceiling portion outside the shaft outer shell is provided. Product name)) 11 is filled. Further, H-shaped steel 12 as an H-shaped cooling body having a cooling structure is arranged in an annular shape near the annular gap 10 on the outside of the heat insulating material 11 as a cooling structure, as shown in FIG.

An opening 16 with a horizontal mounting portion 15 is formed at an intermediate position in the height direction of the shaft outer shell 8, and a bracket 17 for mounting the water cooling jacket 6 is mounted from this opening 16.
It is fastened with bolts and nuts 18 aligned with 15. Reference numeral 21 is a pipe for supplying or discharging cooling water to the jacket 6. Cooling water is circulated and supplied to the recess 23 in the upper half of the H-shaped steel 12. A water-cooled copper pipe 25 is embedded in the lower half of the H-shaped steel 12, and cooling water is supplied from a pipe (not shown).

Due to the above-mentioned structure, the high temperature gas in the furnace is cooled by the lower end portion 5 of the shaft 2 as shown by the arrow in FIG.
After flowing almost vertically through the inside, it turns horizontally and flows toward the uptake. Therefore, unlike the conventional case, the high temperature gas flow does not collide with the inner wall of the lower end portion of the shaft or the inner wall of the ceiling portion of the setler to cause damage.
Further, the castable refractory 7 arranged on the entire inner wall surface of the water cooling jacket 6 inside the furnace is sufficiently cooled by the jacket 6 or the like, so that the heat-induced melting is small and repair can be partially performed. Moreover, since the H-shaped steel 12 having a cooling structure is arranged annularly near the annular gap 10 on the ceiling of the setler 1 adjacent to the lower end 5 of the shaft 2, the shaft 2 and the setler 1 are joined together. The melting damage due to the heat of the setler ceiling near the section is also reduced. Further, even if a crack is generated between the lower end portion 5 of the shaft 2 and the side surface of the ceiling portion of the setler 1 due to thermal expansion at the beginning of operation, the heat insulating material 11 seals the furnace gas leaking from the crack. Furthermore, even if the lower end portion 5 of the shaft 2 extends radially outward due to thermal expansion, the heat insulating material 11 plays a role of adjustment and absorbs the extension of the lower end portion 5 of the shaft 2.

It is needless to say that the water cooling structure using the H-shaped steel 12 is only an example and other structures may be used.

[0012]

Since the present invention has the above-mentioned structure, it is possible to prevent the inner wall of the furnace from being melted by the high temperature gas flow. Also, the castable refractory on the entire inner side wall of the water cooling jacket and on the ceiling of the setler adjacent to the lower end of the shaft is sufficiently cooled, so that heat damage due to heat is small,
Further, there is an excellent effect that repair can be partially performed.

[Brief description of drawings]

FIG. 1 is a partially cutaway vertical front view of a flash furnace of an embodiment of the present invention.

FIG. 2 is a cross-sectional plan view taken along the line II-II of FIG.

FIG. 3 is an enlarged vertical sectional front view of a joint between a lower end of a shaft and a ceiling of a setler.

FIG. 4 is a vertical sectional front view of a conventional flash furnace with a part thereof omitted.

[Explanation of symbols]

 1 Setler 2 Shaft 4 Fire brick 5 Lower end 6 Water cooling jacket 7 Castable refractory 8 Jacket outer shell 11 Insulation material 12 H-shaped steel 19 Annular gap

Claims (2)

[Claims] 1. A flash furnace comprising a tubular shaft and a box-shaped setler connected to each other, wherein a lower end of the shaft connected to the setler ceiling has a water cooling jacket concentrically arranged with the shaft. The entire inner side wall of the water-cooling jacket and the inner wall of the setler ceiling are covered with castable refractory so that the inner side wall of the furnace is substantially vertical and integrally joined to the setler ceiling. A flash furnace. 2. A shaft outer shell is disposed outside the water cooling jacket, and an annular gap formed between the outer shell and the setler ceiling outside the shaft outer shell is filled with a heat insulating material. H with a cooling structure on the outside setler ceiling
The flash furnace according to claim 1, wherein the mold-shaped cooling body is annularly arranged in the vicinity of the annular gap.