JPS59213629A - Heating furnace - Google Patents

Abstract

PURPOSE:To replace an electrode of a heating furnace with an inexpensive material by fitting an electrode consisting of a specific material to the outside of electroconductive refractory fire bricks at high temp. for melting raw materials for glass, etc. by a specified method. CONSTITUTION:The heating furnace 10 consists of an inside section for holding raw materials for melting 13, an outside section for enclosing the inside section from outside, and an electrode section made of a material 16 having low electric resistance which is connectable to a power source. Said inside section is constructed with refractory bricks 11, and said outside section is constructed with a heat insulating material 12. A pair of holes 15 for exposing the surface of the bricks 11 of the inside section are provided to said outside section and the low resistance body 16 is fitted to each hole 15. The resistance body 16 is made of a heat resistant material having no reactivity with the refractory brick 11 or with a material effecting no adverse influence on the molten raw materials even if it causes a reaction with the brick and diffuses into the bricks 11. In this way, an inexpensive material can be used in place of expensive Pt electrode in the above-described heating furnace.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a heating furnace for melting a thick glass phase or the like or heating and maintaining the melted glass layer at a high temperature.

Traditionally, a type of refractory brick has electrocardiographic properties at high temperatures, which has been used to construct a furnace by heating the refractory bricks by supplying electricity to the roof tiles, or by supplying electricity to glass through the refractory bricks. The glass raw materials in the furnace are completely heated.

Specifically, as shown in FIG. 1, an inner part is formed using refractory bricks 1 in which molten glass 2 is hammered or circulated, and this inner part is surrounded by an outer part which also includes heat-insulating bricks 3. , metal plate electrodes 4, 4 are pressed onto both sides j of the refractory brick 1 by an insulator 5 and a spring 6, and the refractory brick 1 is
By adding metal plate electrodes 7 to the bottom of the transformer 8f and connecting these plate electrodes to the power source through a transformer 8f,
Electricity is applied to the refractory brick 1, and the heat generated by this electricity is used to melt the glass raw material or maintain this molten state.

Unfortunately, without providing the blue l/-l-electrode γ, the plate electrode 4,
There are also melting furnaces with only 4.

The metal plate electrodes 4 and 7 are made of platinum, an alloy of platinum and rhodium, stainless steel, mild steel, etc., or if platinum is used, they can be used even at high temperatures. It has the disadvantage of being extremely expensive; on the other hand, it would be cheaper to not use stainless steel or mild steel, or it would not be possible to keep the electrodes warm because they would not prevent oxidation at high temperatures, and if you try to conduct electricity, you would have to use refractory bricks. hr: The temperature of the part decreases by 1, the electrical resistance increases by 11, making it difficult to conduct electricity, and furthermore, the oxides of the Ii'e, Cr, and Ni shields in the firebrick internal plate electrode diffuse and penetrate to the inner surface. , - because of the coloring of the glass,
This may cause foaming, etc.

It's ox, if you shine the freight electric ridge directly on the brick, the brick (,
(ii) If the surface is not flat, the contact resistance will be large, and there is also the problem that people who wish to use a platinum wire mesh in order to overcome this disadvantage end up with 1.

The present invention has been made to solve the problems of the conventional technology, and the first objective is to conduct current with an inexpensive electrode without using commercially available platinum electrodes as in the past, and to It is an object of the present invention to provide a heating furnace which has a longer service life and which does not adversely affect the melting raw material in the furnace.

In order to achieve the objective according to the present invention, the heating furnace according to the present invention exposes the surface of the fire and smoke tiles, which form the inside of the heating furnace, by forming at least a pair of holes on the outside of the heating furnace made of a heat insulating material. ,
In these holes, it is possible to remove a low electrical resistance material such as 5nOz, which has 4 thermal properties and does not react with refractory bricks, or a phase material such as MO, which does not adversely affect the bath melt raw material even if it reacts with refractory bricks. By attaching the low electrical resistance and connecting this low electrical resistance to the electric current, electricity is applied to the fire brick, and the heat generated by the fire brick or raw material melts the raw material by 1.
11, or the gist thereof is to maintain this molten state.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 2 is a longitudinal cross-sectional view of a heating furnace according to the present invention, and the heating furnace 10 is made of alumina-based, 7lumina-silica-based, Si/L/conia-based, alumina-zirconia-silica-based, Flumica-chromia-based, etc. l1111 fire brick 1 obtained by casting
1, and the inner part is surrounded by the outer part, which is also made of heat-insulating bricks 12. and 1
A reservoir 14 for molten glass 13 is completely formed on the upper surface of the inner part made of 11II fire bricks 11, and an il is formed on the left and right sides of the outer part.
A hole 15.15 is drilled to expose the surface of the large fire brick 11.

A low electrical resistance element 16 is removably installed in the hole 15. For example, 511 is used as this low electrical resistance body 16.
02. Possible materials include SiC, Mo5iz, C, Mo, and W. This 9. Since low electrical resistance materials are either stable at relatively high temperatures or become oxidized and volatilized at extremely high temperatures, it is recommended that the surface of the low electrical resistance materials be lined with low melting point glass. preferable. Sashimi C1M, O,
Since W oxidizes and volatilizes at about 600° C., it is preferable not to use it in an inert or reducing atmosphere. Dimensions, I
(A low electrical resistance inclusion 17 is sandwiched between the tip surface of the electrical resistor 16 and the surface of the refractory brick 11. This low electrical resistance inclusion 17 prevents the surface of the refractory brick 11 from being flat. This is to prevent the contact resistance from increasing if the tip of the low electrical resistance element 16 is brought into direct contact with the end surface of the low electrical resistance element 16. Apply to the surface of the brick 11.When kneading with water, it is preferable that the glass powder itself contains alkali, and when kneading with a hydraulic lath, alkali-free glass powder may be used. In this state, the glass melts in the bath, enters the uneven surface of the refractory brick and low electrical resistance material, increases the current carrying area, eliminates the contact resistance, and since the glass has high viscosity in the M-line state, it flows down. Never.

On the other hand, a plate electrode 19 made of mild steel or stainless steel is connected to the rear end surface of the low electrical resistance body 16 via a low electrical resistance inclusion 18 such as carbon fiber or steel wool.
This plate electrode 19 is brought into contact with the spring 20.
and is pressed against the rear end surface of the low electrical resistance body 16 by the insulator 21. In this case, if the contact portion between the plate electrode 19 and the low air resistance inclusion 18 is cooled with a cooler, oxidation of the plate electrode due to crystal sludge can be effectively prevented without cooling the 11111 fire brick. However, the plate electrode 19 and the low electrical resistance body 16 may be connected to each other with bolts.

In "2" below, if the plate 1-electrode 19, 19', c) valve the lance 22 and connect it to the power supply, the low electrical resistance element 16
．． 16 is the role of electrode 1 it! Then, energize the refractory brick 11. This energization generates heat 17,
The glass raw material in the reservoir 14 is melted, or the molten glass is maintained at a predetermined temperature.

After stopping the heating, either remove the plate electrode 19 and leave the tX gas resistor 16 in place to keep it warm.
``The electricity is low.'' (Take the antibody 16 and keep it warm.)

It should be noted that the illustrated example shows an example of the implementation of "Failure", and the present invention is not limited to kneading.

That is, in the illustrated example, the plate 1 is brought into full pressure contact with the rear end face of the low electrical resistance body, but the wire may be connected directly to the low electrical resistance body without using a plate electrode. .

In the illustrated example, a pair of low electrical resistance bodies are arranged on the left and right sides, but the number and location of the low electrical resistance bodies are the same as in a residence.

As explained above, according to the present invention, it is possible to energize bricks at low cost without using expensive materials such as platinum as electrodes for heating furnaces using electrical heating methods, and to react with refractory bricks as small electrodes. Since we used a moon phase that does not adversely affect the common raw material even if it reacts, there is no risk of contaminating the molten raw material, such as the molten glass base material.Furthermore, since the electrode is a heat-generating material, it is possible to keep the heat on the current-carrying part. For this reason, it is possible to reduce the electrical resistance of the current-carrying part to ~F, and as a result, current can be applied at a low voltage, which is advantageous in terms of safety.

Moreover, by fully interposing the contact resistance between the low electrical resistance material and the refractory brick, even if the surface of the large refractory brick is not flat, the contact resistance will not increase, and furthermore, the contact resistance will not increase even if the surface of the large refractory brick is not flat. It doesn't stick either.

Therefore, there are many effects such as ease of arranging low electrical resistance elements.

[Brief explanation of drawings]

The drawings show a conventional example and an embodiment of the present invention.
FIG. 2 is a sectional view of a heating furnace according to the present invention. In the drawing, 10 is a heating furnace, 11 is a fire brick, 12 is a 11M1L phase, 13 is a molten raw material, 15 is a hole, 16 is a low electrical resistance material, and 17 is a low electrical resistance material. Patent mm1 person F] Honsheet Glass Co., Ltd.

Claims (1)

[Scope of Claims] (]) In a heating furnace in which an inner part for holding all of the molten metal is made of refractory bricks, and 1110 parts of the inner part is surrounded by an outer part made of heat-insulating material, the outer part has an inner part of 11111 parts.
At least one pair of holes are formed through which the surface of the refractory brick is exposed,
These holes are equipped with a low electrical resistance material that has thermal properties and does not react with the firebricks or does not adversely affect the molten thick phase even if it reacts and diffuses into the firebricks. A heating furnace consisting of an electrical resistor connected to a heat source. (The heating furnace according to claim 1, characterized in that a low electrical resistance inclusion such as glass is provided between the low electrical resistance body and the fire brick. Claim 1 or 2, characterized in that the material of the low electrical resistance material is substantially composed of SnO□.SiC, MoSi2.C, W, or 1VLo. The heating furnace described in any of the above.