JPS6236071Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to the structure of a furnace component that can improve thermal efficiency when used in a furnace.It can not only be supplied as a unitized panel, but also can be constructed on-site to construct a furnace. It's also wet.

Various improvements have been made for the purpose of energy saving in glass melting furnaces, cement firing furnaces, metal heating furnaces such as steel and non-ferrous metals, and other general industrial furnaces.

For example, an existing or new furnace wall is lined with a heat insulating layer made of ceramic fiber. This method has some effect in preventing heat from being transmitted through the furnace wall and escaping to the outside of the furnace, and is useful as an insulated furnace wall, but it does not promote the heating of objects to be heated inside the furnace as a heating furnace. From a point of view, no radiation effect can be expected from the heat insulating layer.

As another example, it is known that a ceramic porous plate with many irregularities on its surface has the effect of enhancing radiation, and that using such a perforated plate as a furnace lining helps promote heating. .

Although this method is expected to have the effect of increasing radiation, since the perforated plate is directly lined in front of the furnace wall refractories, there is a large amount of heat loss due to heat conduction through the furnace wall refractories. The reality is that practical use has not progressed because cracks occur in the perforated plate or refractory, which is thought to be caused by the difference in thermal expansion between the plate and the furnace wall refractory.

This invention was discovered as a result of various studies in view of these points, and it is a method to create a radiation enhancement effect on the inner surface of the furnace with a wavelength conversion mechanism by using a perforated plate, and to make this effect effective. This has succeeded in providing durability and at the same time preventing heat loss due to heat conduction through the furnace walls.

That is, the gist is a structure of a furnace component consisting of a combination of a radiation-enhancing ceramic layer having a large number of holes or grooves on its surface, a variable heat insulating material layer made of heat-resistant fibers, and a heat-resistant solid heat insulating material layer.

While the invention achieves its objectives in this manner, a further significant advantage is that these components can be supplied as unitary fire-resistant panels.

That is, it can be manufactured in a factory and used as a furnace lining at the site, regardless of whether it is new, existing, or repaired. Of course, if necessary, furnace walls with such a structure can be constructed on-site.
It is also possible to form a furnace ceiling.

Other advantages of the invention will also become clear from the following description with reference to the drawings.

As shown in Fig. 1, the furnace structure 1 of the present invention basically consists of a radiation-enhancing ceramic layer 2 located on the inner surface of the furnace and an intermediate layer on the back side when used as a furnace lining or installed. It consists of a variable heat insulating material layer 3 made of intervening heat-resistant fibers and a solid heat insulating material layer 4 located on the back side thereof,
First, I will explain each of them.

The radiation-enhancing ceramic layer 2 has a large number of holes or grooves on its surface (at least the outer surface located on the inner surface of the furnace), and these holes or grooves are arranged in a direction perpendicular to the surface of the ceramic layer (in the thickness direction). ) may be penetrated or may not be penetrated.

What is shown in FIG. 1 is a so-called honeycomb-shaped ceramic plate having a large number of through holes 2b partitioned by lattice-like thin walls 2a, and what is shown in FIG. is a porous plate-like body formed without penetrating it, and the one shown in FIG. 3 is a plate-like body in which grooves 2d are formed in a lattice shape.

In this way, by using a ceramic layer that has at least a large number of holes or grooves on its outer surface, when used as a furnace lining, it is possible to improve the emissivity from the wall surface. The number, position, shape, depth, size, etc. of the grooves can be appropriately selected depending on the purpose.

Ceramic materials may be made of ordinary oxides such as zirconia, alumina, mullite, magnesia, and cordierite, or may be made of non-oxides such as silicon nitride, silicon carbide, and boron carbide. .

The variable heat insulating material layer 3, which is made of heat-resistant fiber and serves as an intermediate layer, maintains heat resistance and flexibility even when used at high temperatures, and is made of a so-called ceramic fiber having a high melting point. Suitable ceramic fibers include alumina silica, alumina, silica, zirconia, titania, silicon carbide, etc. To form a layered material, woven fabrics, non-woven fabrics, and cotton-like materials made of these materials may be used. It can be used in any form such as a blanket, sheet, or bundle.

In this way, this heat insulating material layer 3 acts as an intermediate layer and an effective heat insulating layer at high temperatures for the inner ceramic layer which has been ignited at high temperature and becomes incandescent, and also acts as a buffer layer between the ceramic layer and the solid heat insulating material layer. This prevents the occurrence of cracks in these and enables a durable structure, and the appropriate thickness for intervening is about 5 to 20 mm.

Next, the solid heat insulating material layer 4 supplements the heat insulating material of the high temperature incandescent ceramic layer as much as possible following the heat insulating material of the variable heat insulating layer 3, and has a sufficient thickness as a refractory material layer with the lowest possible thermal conductivity. It is preferable to form it normally. Thermal conductivity is generally around 0.5Kal/m・hr・℃ (up to 1000℃), and the material can be made of well-known heat-insulating refractories, such as monolithic refractories (castable). It may be a precast product or a pressed product. As a specific example, a lightweight castable refractory made of aggregates such as porous shamots or alumina hollow particles is suitable.

In addition, depending on the purpose, it is desirable to reduce the thickness of this solid heat insulating material layer, or in cases where this layer particularly requires effective heat insulation at high temperatures, it may be used as an intermediate layer. It is also effective to use fibrous insulation materials made of ceramic fibers such as ceramic fibers, but in this case, it is necessary to solidify them in advance using an inorganic binder, or
It is necessary to make it harden and solidify when heated. This is because if the variable shape is used as it is, it is not only difficult to set it in the furnace, but also the furnace cannot be used stably.

The structure of the present invention has a three-layer structure as described above, and these three layers can be used as a panel unit that is integrated in advance, or applied to an on-site furnace. It is also possible to form the layered structure in-situ in a furnace.

In the former case where it is used as a panel unit and in order to facilitate construction, it is desirable to bond the boundary surfaces of each of the three layers with a high temperature adhesive.

Also, regardless of whether or not adhesive is used, these three
As a means of integrating the layers, it is advantageous to use a retainer, an example of which is illustrated in FIGS. 4 and 5.

That is, as shown in FIG. 4, common through holes are formed at appropriate locations in the direction perpendicular to the surface of the three-layer structure (thickness direction), and retainers (studs) 5 such as anchor bolts made of ceramic are inserted into these through holes. The enlarged head 5a of the holder suppresses the radiation-enhancing ceramic layer, and the solid heat insulating material layer is inserted into the nut 5b.
It can be locked in place.

In addition, as shown in FIG.
One end of the holder 5 in which d is embedded is covered with the ceramic layer 2.
It is possible to extend the nut 5C to the outside and lock the ceramic layer at the same time as screwing the nut 5C thereto.

The structure of such a structure of the present invention can be used to construct the furnace wall (furnace ceiling) directly as the three-layer body itself, or to line the furnace shell and further form the furnace wall (ceiling) lining. It can also be used as a lining to construct a furnace.

As described above, the present invention makes it possible to simultaneously achieve a heating effect due to radiation enhancement and prevent heat loss due to insulation, and has great practical value.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view for explaining an example of the structure of the structure of the present invention, FIGS. 2 and 3 are partial perspective views showing an example of a radiation-enhancing ceramic layer, and FIG.
FIG. 5 and FIG. 5 each show a cross-sectional view showing an example of a usage mode. In the drawings, reference numeral 1 indicates the structure of the inventive structure, 2 a radiation-enhancing ceramic layer, 3 a deformable heat insulating material layer, 4 a solid heat insulating material layer, and 5 a holder.

Claims (1)

[Claims for Utility Model Registration] 1. A structure of a furnace component consisting of a combination of a radiation-enhancing ceramic layer having a large number of holes or grooves on its surface, a variable heat insulating material layer made of heat-resistant fibers, and a heat-resistant solid heat insulating material layer. 2. Claims for Utility Model Registration in which a ceramic holder is inserted in a direction perpendicular to the surfaces of the radiation-enhancing ceramic layer, the deformable heat insulating material layer, and the solid heat insulating material layer, and the three layers are held together by the holder. 1st
Structure described in section.