JPH0229954B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a heat insulating structure for a ceiling in a furnace such as a heating furnace or a soaking furnace.

BACKGROUND OF THE INVENTION Furnaces equipped with a heat insulating layer using a blanket or felt made of refractory heat insulating fiber such as ceramic fiber have been known. Furnaces using such fireproof insulation fibers are provided with a furnace shell shell on the sides and ceiling of the furnace so as to completely surround the inside of the furnace, and a heat insulating material made of fireproof heat insulation fibers is attached to the surface of the furnace shell shell to form a heat insulation layer. There are various methods of attaching the heat insulating material to the furnace shell, which constitutes the furnace shell. A widely used method is to prepare a block and attach the block to the surface of the furnace shell using mounting hardware.

Problems to be Solved by the Invention However, it has been found that the following problems occur in the heat insulating structure of the ceiling in conventional furnaces. In other words, a heat insulating block is attached to the inner surface of the furnace shell on the ceiling to form a heat insulating layer, but because the temperature inside the furnace is extremely high, the temperature can rise to 100 to 200℃ even at the furnace shell. Because of this temperature rise, the furnace shell on the ceiling expands thermally. The entire periphery of the ceiling furnace shell is welded to and restrained by the furnace shell on the side of the furnace, so it cannot expand freely, causing the ceiling furnace shell to warp in a wavy manner. When the furnace shell is bent in a wave-like manner, as shown in FIG.
The heat insulating blocks 11 attached to the lower surface of the heat insulating blocks 11 are inclined, and gaps 12 are created between the blocks 11.
If such a gap 12 occurs, the furnace shell shell 10 will be directly exposed to the high temperature gas in the furnace, and will be rapidly oxidized and damaged, causing a serious accident.

The present invention was developed in view of the current situation, and even if the member supporting the heat insulating layer made of refractory heat insulating fibers in the furnace ceiling becomes capable of thermal expansion, the member will not bend in a wave-like manner and will not cause any hindrance to the heat insulating layer. The purpose is to provide a new furnace ceiling insulation structure that does not cause heat generation.

Means for Solving the Problems The present invention, which was made to solve the above problems, includes a heat insulating material support plate suspended from a frame of the furnace ceiling and not fixed to the side of the furnace, and a heat insulating material support plate on the lower surface of the support plate. and a heat insulating layer of refractory heat insulating fibers attached thereto, the area of the support plate is smaller than the area surrounded by the side of the furnace, and the support plate is configured to be able to expand thermally without being restricted by the side of the furnace. The furnace ceiling has an insulating structure. Here, not fixed to the furnace side means
This does not mean only the case where the entire periphery of the heat insulating support plate is not fixed to the furnace side surface, but also includes the case where most of the circumference is not fixed so as to allow thermal expansion.

Function In the heat insulation structure with the above configuration, the support plate is suspended from the ceiling frame and is not fixed to the side of the furnace, and the area of the support plate is smaller than the area surrounded by the side of the furnace, so it can freely expand thermally. It is possible. For this reason, even when the support plate is heated, it can only freely extend horizontally and will not bend in a wave-like manner, which will cause the thermal insulation blocks attached to the support plate to tilt and create gaps between the blocks. There is no. In addition,
Since the heat insulating blocks are compressed and attached to each other, there will be no gap between the blocks even if the support plate stretches a little.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will now be described in detail as illustrated in the accompanying drawings.

In Fig. 1, numeral 1 indicates the furnace shell shell on the side of the furnace;
2 is a side wall frame that supports the furnace shell 1; 3;
is the ceiling frame. A large number of thermal insulation blocks 4 are attached to the inner surface of the furnace shell to form a side insulation layer. Ceiling frame 3 is installed on the furnace ceiling.
A heat insulating support plate 6 is suspended by a large number of hanging metal fittings such as hanging bolts 5, and a large number of heat insulating blocks 7 are attached to the lower surface thereof to form a heat insulating layer for the ceiling. Note that a reinforcing frame 8 is attached to the upper surface of the support plate 6. As can be clearly seen from the drawing, the support plate 6 has an area slightly smaller than the area surrounded by the furnace shell shell 1 on the side of the furnace.
Moreover, it is placed apart from the furnace shell shell 1, and therefore can be thermally expanded in the horizontal direction. As the support plate 6, a non-porous iron plate similar to the furnace shell shell forming the conventional furnace ceiling may be used, or a punched metal or expanded metal with many holes may be used to reduce weight. It's okay. As for the heat insulation blocks 4 and 7 forming the heat insulation layer, publicly known ones such as those disclosed in the above-mentioned Japanese Patent Application Laid-Open No. 2002-121002 can be appropriately used. Each block is attached in a compressed state, and the gap between the blocks is closed by its own restoring force. It forms a heat insulating layer without. Between the top of the insulation layer on the side and the bottom of the insulation layer on the ceiling,
A sealing material 9 such as a blanket made of fireproof heat insulating fiber is installed as necessary to prevent gaps from forming.

According to the above heat insulation structure, since the outer circumference of the ceiling support plate 6 is not restrained, it can freely expand thermally in the horizontal direction, and as shown in FIG. There is no possibility that this will occur. Therefore, the heat insulating layer is always effective and can protect the outside from the high temperature inside the furnace. Since the thermal insulation block 7 made of a blanket made of fireproof insulation fiber is breathable, it may be used as a support plate to form a gap between the support plate 6 on the furnace ceiling and the furnace shell shell 1 on the side of the furnace. If expanded metal is used, there is a concern that the gas inside the furnace may leak to the outside, but the heat insulating layer made of fireproof insulation fibers sufficiently blocks the gas inside the furnace and prevents gas from leaking outside and causing trouble. It was confirmed that there was no such thing.

In the above embodiment, the heat insulating layer formed on the lower surface of the support plate 6 of the furnace ceiling was formed by arranging a large number of heat insulating blocks, but the present invention is not limited to this structure. A heat insulating layer formed by laminating felt may also be used.

Effects of the Invention As described above, according to the present invention, a support plate that is not restricted by the side shell of the furnace shell is suspended from the furnace ceiling, and a heat insulation layer of fireproof insulation fibers is formed on the lower surface of the support plate. Even when the support plate undergoes thermal expansion, it does not bend in a wave-like manner, and the problem of gaps occurring in the heat insulating layer does not occur. Furthermore, since the heat insulating layer is made of fireproof heat insulating fiber, it is lightweight, and the support plate and the heat insulating layer can be suspended with a simple structure.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of essential parts showing one embodiment of the present invention;
FIG. 2 is a partial sectional view showing problems in the conventional ceiling insulation structure. 1... Furnace shell skin, 2... Side wall frame, 3...
Ceiling frame, 4... Heat insulation block, 5... Hanging fittings, 6... Support plate, 7... Heat insulation block,
8...Reinforcing frame, 9...Sealing material.

Claims (1)

[Claims] 1 Consisting of a heat insulating support plate suspended from a frame on the furnace ceiling and not fixed to the side of the furnace, and a heat insulating layer of fireproof insulation fibers attached to the lower surface of the support plate, the area of the support plate is the same as that of the furnace. A heat insulating structure for a furnace ceiling characterized by having an area smaller than the area surrounded by the side surfaces and configured to be able to expand thermally without being restricted by the furnace sides.