JPS6047513B2 - Water cooling structure of furnace wall - Google Patents

Description

[Detailed Description of the Invention] This invention is a furnace used for incinerating garbage incineration ash and sewage treatment materials, or for melting steel and other metals, by cooling the furnace wall at the part that comes into contact with the melted material in the furnace. This invention relates to a water cooling structure for a furnace wall, which is used to prevent the furnace wall from being damaged by high-temperature melts.

Conventionally, this type of water cooling structure has been carried out by burying a cooling pipe in the vicinity of the part of the furnace wall that comes into contact with the melt, and passing high-pressure cooling water through the cooling pipe.

With this kind of structure, a high cooling effect can be obtained because high-pressure cooling water is passed through it, but if the pipe cracks due to thermal distortion, high-pressure cooling water will blow out from the crack, and this will blow out into the furnace. There is a problem in that there is a risk of water vapor leaking inside and causing a steam explosion. The present invention has been made to solve the above-mentioned problems, and is intended to provide a water-cooled structure for the furnace wall that not only provides a high cooling effect but also has excellent safety.

The drawings showing the embodiments of the present application will be described below. 1st
In the figure, a furnace 1 is constructed by lining a furnace shell 3 made of a metal material such as a steel plate with refractories 4 and 5. The refractories 4 and 5 include seawater magnesia, seawater magnesia and 20% carbon, and fused magnesia and 15% carbon.
% alumina or direct bond maguro. Although only a part of the furnace 1 is shown in the figure, it is formed so as to surround the entire periphery of an internal charging space 2, and although not shown, an arc electrode and other heating devices are installed at the top of the furnace 1. will be placed. Next, reference numeral 6 denotes a cooling body, which is formed in an annular shape so as to constitute the furnace wall on the side of a layer of slag (indicated by reference numeral 18) that is expected to exist during operation, which will be described later. In this cooling body 6, 7 indicates a main body, and 8 is a jacket, which utilizes a part of the furnace shell 3,
A metal material such as a steel plate is welded to this. Reference numeral 9 indicates a water passage portion formed inside the jacket 8, 10 indicates an upper end opening, and 11 indicates a drain port.

Although the jacket 8 is configured in an open type in this example, it may be configured in a closed type. 12 is a substrate provided in contact with the inner side wall 8a of the jacket 8;
Reference numeral 13 denotes a thin plate-shaped fin that stands upright from the substrate 12, and is made of a material with good thermal conductivity such as iron or copper.

The thickness of the fin 13 is generally 0.1 to 3 TnIft, but preferably 0.2 to 1 T$l. 14 is a refractory material, and the same material as the refractory materials 4 and 5 is used.

Next, reference numeral 15 denotes a water supply vibrator disposed in the water passage section 9 of the jacket 8, through which high-pressure cooling water is fed. Reference numeral 16 denotes a cooling water outlet, which is configured to be able to blow out cooling water toward the side wall 8a of the jacket 8.

Note that the position of the water supply vibrator 15 and the shape and direction of the outlet 16 can be arbitrarily configured so that the cooling water in contact with the side wall 8a can be moved violently as described below. In the case of the above configuration, any workpiece (
Garbage incineration ash, sewage treatment material, steel, etc.) are charged, and the material to be treated is heated by a heating device, so that a layer of slag 18 floats on top of the molten metal 17 in the lower part of the furnace. state.

On the other hand, in the cooling body 6, the air outlet 16 of the water supply vibrator 15
High-pressure cooling water is blown out toward the side wall 8a from the side wall 8a.
The cooling water that comes into contact with the side wall 8a moves rapidly, that is, the new cooling water blown out from the outlet 16 comes into contact with the side wall 8a one after another, and the side wall 8a is effectively cooled.

At this time, the warm cooling water is discharged from the drain port 11, and the pressure in the water passage section 9 is always lower than the pressure inside the water supply vibrator 15 (
example. 1000m1nAq or less). In this state, a portion of the slag 18 (a portion close to the furnace wall) is deprived of heat via the refractory 14, and a portion of the slag 8 solidifies, forming a solidified wall 19 on the refractory 14. Attach to.

This solidified wall 19 prevents the high-temperature slag 18 (for example, 1400° C.) from directly touching the refractory 14, thereby preventing wear and tear of the refractory 14 due to thermal or chemical action. In this case, since the side wall 8a cools a portion of the slag 18 via the refractory 14 without directly contacting the slag 18, the low thermal conductivity of the refractory 18 causes the inside of the furnace to cool. Since the temperature drop in the furnace is kept small and the fins 13 have good thermal conductivity, the solidified wall 19 of the slag can be formed to an appropriate thickness, and the furnace is well protected. Can be done. In this example, the slag 18
The space in which the heating device exists, that is, the space where heating is most actively performed by the heating device, is also called the processing space. Next, FIG. 2 shows an example of an arc furnace for melting metal. In such a furnace, metal is melted into molten metal 21 by an arc emitted from an electrode (not shown). The upper layer of the molten metal 21, that is, the portion 1 located in the processing space is always heated by the arc. Therefore, the surface 21a of the molten metal 21 has waves even in the vicinity where it touches the furnace wall. However, the refractory 14 that makes up the furnace wall
Since e is constantly cooled, a part of the periphery of the molten metal 21, that is, a part in contact with the refractory 14e,
Heat is removed through 4e and it is cooled. As a result, wear and tear on the refractory 14e is prevented. It should be noted that parts that are functionally the same or equivalent to those in the previous figure are given the same reference numerals as in the previous figure with an Alphabet e, and redundant explanations are omitted.

As described above, in this invention, since the furnace wall located on the side of the planned processing space in the furnace is composed of a cooling body, even if high-temperature melt comes into contact with it during operation of the furnace,
By cooling the melt, it is possible to prevent the high-temperature melt from directly touching the furnace wall, which has the effect of preventing the furnace wall from being damaged by the high-temperature melt. Furthermore, since the above-mentioned cooling body blows out the high-pressure cooling water passed through the water supply vibrator toward the side wall located between the water passage part and the processing space in the main body, during cooling, , the movement of the cooling water in contact with the side wall can be increased, that is, the stagnation of the cooling water in that part can be eliminated, and the efficiency of removing heat from the melt as described above can be increased, further reducing wear and tear on the furnace. It has a suppressing effect.
Moreover, even though the present invention is designed to obtain a high cooling effect by passing high-pressure cooling water as described above, the high-pressure cooling water is passed through a water supply vibrator disposed in a water passage part within the main body. By blowing out the cooling water to the water passage part inside the main body, the pressure of the cooling water becomes low in the water passage part inside the main body, so even if a crack gets into the main body, there is no problem. Even if the water leaks into the furnace, it is possible to prevent the cooling water from gushing into the furnace from the cracks. There is safety that can be prevented.

[Brief explanation of the drawing]

The drawings show an embodiment of the present application, and FIG. 1 is a vertical cross-sectional partial view of a waste incinerator, and FIG. 2 is a vertical cross-sectional partial view of a metal melting furnace.

Claims (1)

[Claims] 1. In a furnace having a charging space into which the material to be processed can be charged, the furnace wall located on the side of the processing space that is planned to exist in the charging space may also be composed of a cooling body. In addition, the cooling body is composed of a main body having a water passage section for circulating cooling water, and a water supply pipe disposed within the water passage section and configured to flow high-pressure cooling water, and furthermore, the cooling body includes the water supply pipe. The reactor wall is characterized in that the main body is provided with an outlet for blowing out cooling water toward a side wall located between the water passage section and the planned processing space. water-cooled structure.