JPS5969685A - High heat-insulating furnace - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a highly adiabatic furnace that does not cause a decrease in the insulation effect.

Electric furnaces and gas furnaces are used for melting, keeping warm, or heat treating metals. Conventionally, electric furnaces and gas furnaces have been insulated by applying a lining around the innermost layer. Traditionally, insulation bricks have been used as the lining insulation material. And if you want to further increase the insulation effect, use fiber M as a lining insulation material! Fj insulation material was used.

However, a large load is placed on the bottom of the innermost layer of the furnace. Therefore, the lining insulation material below the bottom of the innermost layer is compressed. As a result, the insulation lining loses its insulation effect. In addition, there is a risk of damage to the furnace-to-external connection if the lining insulation is compressed.

For this reason, in the past, a plurality of simple refractory blocks were sometimes arranged as supports supporting the innermost layer. However, ordinary refractory blocks lack stability and have a narrow insulation range. For this reason, when it was necessary to increase the heat insulation properties, a large amount of lining insulation material was used, even if its heat insulation properties were somewhat inferior, but it was durable. As a result, it took a long time to manufacture the furnace.

The present invention was made in view of the above-mentioned circumstances, and an object of the present invention is to provide a high-place heat furnace that can maintain high heat insulation properties for a long time without compressing the lining insulation material. do.

The high-altitude heat furnace of the present invention supports the innermost layer of the furnace with struts having excellent compressive strength and fire resistance, and the surroundings of the branch are filled with highly insulating fibers.

Since the high-altitude heat furnace of the present invention is configured as described above, it has excellent heat insulation properties. Further, since the lining heat insulating material is not compressed, the heat insulating properties of the lining heat insulating material do not deteriorate. Therefore, even if the compressive strength is poor, a heat insulating material with low thermal conductivity can be used as the lining heat insulating material. Using an insulation material with a low thermal conductivity reduces the amount of lining insulation material and simplifies furnace construction.

Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

Figure 1 shows the support used in the high-place heat furnace of the present invention. FIG. 1 is a perspective view showing an example of FIG.

Pillar 1 has a cross shape. The cross-shaped branch 11 is very stable. This support 1 is installed below the bottom of the innermost layer 3 of the furnace as shown in Figure 2-3. And the area around pillar 1 is highly insulated! Fill with &1iI112. In FIG. 2, the lining insulation material around the outer periphery of the innermost layer 3 is omitted.

The compressive load applied to the highly insulating fibers 2 by the struts 1 is O. Therefore, even highly insulating fibers having a bulk specific gravity of 0.06 to 0.1 and a thermal conductivity of about 0.03 to 0.1 can be used satisfactorily. The innermost part 1rI3 may be made of bricks, but a crucible-like part is preferable.

The branch 11 is made of Lit, a fireproof material with excellent compressive strength.

The material for the branch 1 may be firebrick or castable refractory. The key is to use a material that will not be damaged by the load and atmospheric exhaustion of the innermost layer 3. Casting of castable refractories is preferable from the viewpoint of ease of manufacture.

Since the strut 1 must be made of a material with compressive strength, its insulation properties are inferior to the surrounding highly insulating fibers 112. Therefore, in order to prevent heat from escaping from the pillar 1, as shown in Figure 3, cuts 1C are made in the upper and lower surfaces 1a and 1b of the pillar 1, and highly insulating fibers 2 are attached thereto. good.

A comparative test was conducted on the furnace shell temperature and the amount of heat dissipated between the high-altitude heat furnace of the present invention and a conventional furnace. The results are shown below.

The conventional furnace used in the comparative test had an innermost layer 4 made of bricks, as shown in FIG. For the innermost layer 4, firebrick with a thickness of 651III was used. The thermal conductivity λ of this firebrick was 2.0 kcal/mh'c. Both the second layer 5 and the third Fm6 have a thickness of 50I.
R111 fireproof insulation brick was used. The thermal conductivity λ of the second layer 5 is 0°45 kcal/mh”c, and the thermal conductivity λ of the third layer 6
The thermal conductivity λ is 0, 20 kcal/mh'cr
Atta.

On the other hand, the high place heat furnace of the present invention also has an innermost layer 3 as shown in FIG.
was made of brickwork with the same conditions as a conventional furnace. The thickness A of the pillar 1 is 11001I1, which is similar to the second layer 5 of the conventional furnace.
And the thickness was the same as that of the third layer 6. The thermal conductivity λ of pillar 1 is 1, 2
kcal/mh°C. The thermal conductivity λ of the highly insulating fiber 2 around the pillar 1 was Q, 1 kcal/11111°C.

Now, when the temperature inside the furnace was 1000° C., the furnace shell temperature and the amount of heat dissipated were as follows.

First, in the case of a conventional furnace, the furnace shell temperature was 185°C and the amount of heat dissipated was 2056 kcal/IIl'' h.

Next, in the case of the high-place heat furnace of the present invention, the furnace shell temperature is 315°C in the support column 1 and the radiated heat 11z is 5896 kcal/m"h, and the furnace shell temperature is 114°C in the highly insulated 11i fiber 2 part, and the amount of heat radiated is 860 kcal. /ra”h.

Since strut 1 occupies about 11% of the area at the bottom of innermost layer 3, the overall innermost layer M3 has the following formula: (315x1 +11 /lX9)/10
=134.1℃ Dissipated heat amount (5896x1+860x9)/10=
It becomes 1363.6kcal/m2h.

Therefore, the high-altitude heat furnace of the present invention has a furnace shell temperature lowered by 50°C and a dissipated heat amount of 692 kcal/m compared to the conventional furnace.
'H decreased (33.6% decrease) by 1.

The struts 1 used in the high-altitude heat furnace of the present invention are not only used to support the bottom of the innermost layer 3, but may also be used to support the side walls.

FIGS. 6 and 7 are explanatory diagrams showing examples of arrangement of the support columns 1. FIG.

In the arrangement shown in Figure 6, the bottom of the innermost layer 3 is currently 1000.
1IIl x 11000Il1 can support an electric furnace of 1m3 in total. However, as shown in Figure 7, the pillar 1
By arranging , it is possible to support an even larger furnace without changing the size of the pillar 1.

If the innermost layer 3 of the furnace is made of bricks, it will be very stable if the four corners of the bricks 7 are placed in the center of the pillar 1 as shown in FIG.

FIGS. 9 to 11 are perspective views showing examples of support columns used in the present invention.

In FIG. 9, a refractory pipe 8 supports the innermost layer 3 as a support. The inside of the refractory pipe 8 is filled with fiber bulk 9. 10.11 is lining insulation material, 1
2 indicates the furnace shell.

A protrusion 13 is formed as a support 11 at the bottom of the innermost layer 3 with dimensions shown in FIG.

The innermost layer 3 shown in FIG. 11 is supported by a honeycomb shell 14 made of refractory material. The inside of the shell 14 is filled with fiber bulk 9.

[Brief explanation of drawings]

FIG. 1 is a perspective view showing an example of a strut used in the high-altitude heat furnace of the present invention, FIG. Fig. 3 is a perspective view showing another example of support ◆1 used in the high-place heat furnace of the present invention, and Figs. 4 and 5 are diagrams for comparing the conventional furnace and the high-place heat furnace of the present invention. FIGS. 6 to 8 are explanatory diagrams showing examples of arrangement of columns, and FIGS. 9 to 11 are perspective views showing other examples of columns used in the present invention. 1... Strut 2... Highly insulating fiber 3... 4 Innermost layer 7... Brick 8... Refractory pipe 9... ... Fiber bulk 10.11 ... Lining insulation material 12 ... Furnace shell 13 ... Protrusion 14 ... Shell Patent applicant Toshiba Ceramics Co., Ltd. Procedural amendment (voluntary) ) November 14, 1980 Commissioner of the Japan Patent Office Kazuo Wakasugi 1, Indication of the case Patent Application No. 161025/1982 2, Name of the invention High-altitude thermal furnace 3, Relationship with the person making the amendment Patent applicant address Tokyo 1-26-2 Nishi-Shinjuku, Shinjuku-ku, Tokyo Name: Toshiba Ceramics Co., Ltd. 4; Agent address: 2-8-1 Toranomon, Minato-ku, Tokyo; None; 6; "Detailed description of the invention" column 7 of the specification to be amended; Details of the amendment (1) The second daughter will be added after "become." on the 7th line of the 3rd page of the statement. ``The heater for heating inside the furnace can be electric, gas, or any other heating method.''

Claims (3)

[Claims] (1) In a furnace used for heat treatment, metal melting, and heat retention, the innermost layer of the furnace is supported by struts with excellent compressive strength and fire resistance, and the periphery of the struts is filled with highly insulating fibers. A highly insulated furnace featuring (2) The highly adiabatic furnace according to claim 1, wherein the support column is cross-shaped. (3) The highly adiabatic furnace according to claim 1, wherein the support column is pipe-shaped.