JPH0125888Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to the structure of a burner tile for an industrial kiln such as a heating furnace or a heat treatment furnace.

(Prior art) Furnace walls around burner tiles used to construct industrial furnaces such as heating furnaces and heat treatment furnaces have conventionally been made of refractory bricks, refractory insulation bricks, castable refractories, and plastic refractories (hereinafter referred to as refractory bricks, etc.). . On the other hand, in recent years, more and more furnaces are using ceramic fibers for their furnace walls in order to save energy and provide thermal penetration. In particular, all-ceramic fiber furnaces are becoming mainstream in heat treatment furnaces.

Burner tiles are made of refractory bricks, castable refractories or plastic refractories;
The burner tiles are attached to the furnace wall. The structure for attaching the burner tile to the furnace wall is, for example, as shown in JP-A-50-66839, in which the burner tile is integrally fitted into a through hole in the furnace wall.

By the way, thermal history is exerted on both the furnace wall and the burner tile due to the operation of the furnace, and it is inevitable that cracks will occur in the burner tile due to repeated thermal expansion and contraction due to the operation of the furnace. If a burner tile breaks, it will not have much of an effect on conventional furnace walls constructed of refractory bricks, but even so, after long-term operation, the refractory bricks of the furnace wall may crack or the side walls may bulge out. The hot flame within the burner can rotate around gaps created by cracks or bulges in the furnace wall, leading to overheating of the furnace wall shell. However, in the case of an all-ceramic fiber furnace, if a burner tile breaks, the ceramic fiber may shrink abnormally in the high-temperature flame. In addition, if a burner tile cracks parallel to the thickness direction of the furnace wall (circular crack), the surrounding ceramic fibers cannot hold it in place, causing the burner wick to shift or fall off, contributing to abnormal combustion. In many cases, the wall steel overheats prematurely, leading to the suspension of operation.

(Purpose of the invention) This invention was made in view of the actual situation, and it prevents the burner tile from falling off even if it is broken and the furnace wall around the burner tile from being damaged by the high-temperature flame, thereby improving the stability of operation. The aim is to create a burner tile structure that can extend the life of the furnace.

(Structure and operation of the invention) Next, the invention will be described in detail based on one embodiment with reference to the drawings.

Both FIG. 1 and FIG. 2 show a cross section of a part of a furnace wall provided with burner tiles.

In FIG. 1, a furnace wall 1 is constructed of refractory bricks 2. 3 is a burner tile with a burner case 4 and a stud 5 installed in the burner case 4.
is held by.

A sleeve brick 6 made of a refractory material according to the present invention is provided to surround the outer periphery of the burner tile 3, and forms a double tile structure with the burner tile 3.

Furnace wall 1 is placed on the outside of this refractory sleeve brick 6.
Refractory bricks 2 are provided for constructing.

Note that 7 is tile hardware and 8 is iron skin.

In the present invention, a refractory sleeve 6 is provided around the outer periphery of the burner tile 3, so even if a crack occurs in the burner tile 3 due to the progress of furnace operation, the high-temperature flame inside the burner (not shown) will be removed from the furnace wall. It is prevented from going to the side.

Next, another embodiment will be described with reference to FIG. This is the case when the furnace wall 1 is applied to an all-ceramic fiber furnace constructed of ceramic fiber.

In FIG. 2, the furnace wall 1 is constructed from ceramic fiber 9. 3 is the burner tile,
4 is a burner case, and 5 is a stud.

A refractory sleeve brick 6 is provided around the outer periphery of the burner tile 3 to form a double tile structure. Reference numeral 7 denotes tile hardware, which in this embodiment is provided outside the fireproof sleeve brick 6.

By the way, conventionally, due to the operation of the furnace, the tile hardware 7 suffers oxidative wear and tear due to long-term use, and gaps are formed due to shrinkage and sagging of the surrounding ceramic fibers 9, causing oxidative wear and tear of the tile hardware 7, which causes burner tiles 3 to deteriorate. Retention function is significantly reduced. If a ring-shaped crack occurs in the burner tile 3 under such conditions, the tip may fall off due to the lack of holding force of the tile hardware 7, or the burner (not shown) may cause abnormal combustion and the iron skin 8 may overheat. .

However, in this invention, fireproof sleeve bricks 6
By providing this on the outside of the burner tile 3 and on the inside of the tile hardware 5, troubles when the burner tile breaks can be prevented. The material for the refractory sleeve brick may be selected from among silica-alumina, silicon carbide, silicon nitride, etc. materials that can withstand the burner combustion temperature. Also, depending on the material selected, it may be necessary to provide an expansion allowance at the joint between the refractory sleeve brick and the burner tile.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing one embodiment of the present invention, and FIG. 2 is a diagram showing another embodiment of the present invention. 1... Furnace wall, 2... Refractory brick, 3... Burner tile, 4... Burner case, 5... Stud, 6... Sleeve brick, 7... Tile hardware,
8...Ironhide.

Claims (1)

[Scope of utility model registration request] A burner tile structure characterized in that a sleeve brick made of a fireproof material is provided surrounding the outer periphery of the burner tile to form a double tile structure.