JPH063061A - Kiln - Google Patents

Abstract

PURPOSE:To provide an indirect heating kiln in which it is prevented from being more large-sized than it is needed, it easily ensures uniform heat, and it has high heat efficiency. CONSTITUTION:There are provided calcination chambers 21 and 22. The calcination chamber 21 forms a space for containing an article to be calcined. The calcination chamber 22 includes a calcination heat source device 4. and is provided next to the calcination chamber 21 and is partitioned from the calcination chamber 21 with a heat transfer isolation wall 23.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a firing furnace used for firing ceramic products.

[0002]

2. Description of the Related Art Ceramics used for various electronic parts and the like are obtained by firing an article to be fired, which is a mixture of a predetermined ceramic powder and an organic binder, through a firing furnace. A combustion heat source and an electric heat source are used as the heat source. Combustion heat sources have the advantage that the running costs are cheaper than electric heat sources. When using a combustion heat source,
If the material to be fired is a substance that is not affected by combustion gas, etc., a direct heating method can be used in which the material to be fired is burned in the furnace chamber in which it is placed. In the case of the firing of substances that should not be used, the indirect heating method is adopted. Known indirect heating methods include a radiant tube method and a muffle structure method. The radiant tube system has a structure in which fuel is burned in a heat resistant cylinder. The heat-resistant cylinder is made of metal or ceramic, and many of these are introduced into the furnace chamber through the furnace body. The muffle structure method has a structure in which the firing chamber is surrounded by a heat-resistant metal or refractory, and the object to be fired in the firing chamber is heated by combustion air from an external memorandum bypass.

[0003]

However, in the case of the radiant tube system, a large number of radiant tubes have to be arranged, which makes it impossible to avoid a rise in equipment costs. Moreover, even if the radiant tube is arranged so that the distance from the wall surface is more than the tube diameter at the expense of soaring equipment costs, the heat transfer surface is not sufficiently uniform.

In the case of a muffle furnace having a refractory metal wall, the use of the furnace is limited to 900 ° C. or less because of its heat resistance.
In a higher temperature firing furnace, the heat transfer wall is a stack of refractory bricks, so the furnace itself becomes large and is not economical except for mass production.

Therefore, an object of the present invention is to provide an indirect heating type firing furnace which does not cause an unnecessarily large size, is easy to uniformly heat, and is highly efficient.

[0006]

In order to solve the above-mentioned problems, the present invention is a firing furnace having a firing chamber and a combustion chamber, wherein the firing chamber constitutes a space for containing an object to be fired. The combustion chamber has a combustion heat source device, is adjacent to the firing chamber, and is separated from the firing chamber by a heat transfer partition.

[0007]

Since the combustion chamber is partitioned from the firing chamber by the heat transfer partition, the atmospheric gas in the firing chamber can be selected to have an optimum composition for firing without being influenced by the combustion exhaust gas of the combustion heat source device. Therefore, it is possible to obtain a baked product of constant quality.

Further, since the combustion chamber is separated from the firing chamber by the heat transfer partition wall, the size of the combustion chamber is not increased more than necessary, and uniform heat can be taken easily and the thermal efficiency is high.

[0009]

1 is a sectional view of a firing furnace according to the present invention, and FIG. 2 is a sectional view taken along line A2-A2 of FIG. The firing furnace according to the present invention includes a mass production continuous furnace, a mass production batch furnace, and a test furnace. 1 is a refractory furnace, 21 is a firing chamber, 22 is a combustion chamber, 3 is an object to be fired, 4 is a combustion heat source device
Reference numeral 5 is another heat source device, and 6 is a heat exchange device. The furnace body 1 is formed by using refractory bricks or the like. The firing chamber 21 is
A space for housing the object to be fired 3 is formed. The combustion chamber 22 is
It has a combustion heat source device 4 and is adjacent to the firing chamber 21 and
It is partitioned by the refractory heat transfer partition wall 23 from 1.

The object to be fired 3 is a ceramic product containing an organic binder, which is housed directly or inside a heat-resistant case, and is further placed on the heat-resistant base plate 9 and housed inside the firing chamber 21. The combustion heat source device 4 is arranged inside the combustion chamber 22. The combustion heat source device 4 is a gas burner, an oil burner, or the like.

The combustion chamber 22 extends from the firing chamber 21 to the heat transfer partition wall 23.
Since the gas is partitioned by, the atmospheric gas in the firing chamber 21 can be selected to have an optimum composition for firing without being influenced by the combustion exhaust gas of the combustion heat source device 4. Therefore, it is possible to obtain a baked product of constant quality.

Further, since the combustion chamber 22 is partitioned from the firing chamber 21 by the heat transfer partition wall 23, unlike the case of the radiant tube system, it does not cause an unnecessarily large size and it is easy to obtain uniform heat. , High thermal efficiency.

The combustion chamber 22 is arranged on at least one side of the firing chamber 21, and the heat transfer partition wall 23 constitutes a part of the wall of the firing chamber 21. With such a structure, soaking can be more easily achieved and thermal efficiency can be improved. The soaking and thermal efficiency are further improved by disposing the combustion chamber 22 on both sides of the firing chamber 21. It is desirable that the heat transfer partition wall 23 has an area of 40% or more of the wall forming the firing chamber. With such a configuration, it has been found that the object 3 to be fired has a good soaking degree, and even if the temperature changing rate is large, the quality defects are small and it is economical.

The combustion chamber 22 is divided into two by a partition plate 223.
The combustion heat source device 4 is arranged in the first chamber 221 and the second chamber 222 constitutes an air supply path. Second chamber 222
Constitutes an air supply passage for supplying outside air taken in from the outside to the first chamber 221.

In the embodiment, the other heat source device 5 is used as a heat source for obtaining a part of the heat necessary for firing the object to be fired 3, and the combustion heat source device 4 supplies most of the heat as a backup heater. An arbitrary number of combustion heat source devices 4 and other heat source devices 5 are provided. With such a structure, the combustion heat source devices 4 are driven so that a required number of heat outputs can be obtained, so that firing conditions such as drying, heating, soaking, and cooling can be freely set. be able to. Preferably,
The other heat source device 5 is an electric heat source. Since the combustion heat source device 4 is a combustion heat source such as a gas burner, the heat energy cost is lower than that when an electric heat source is used alone.

FIG. 3 is a front partial sectional view showing another embodiment of the firing furnace according to the present invention. In the figure, the same reference numerals as those in FIG. 1 denote the same components. In this embodiment, the combustion heat source device 4 is arranged on the side surface of the furnace body 1. In the combustion chamber 22, the first chamber 221 is adjacent to the firing chamber 21, and the second chamber 222 is located outside the firing chamber 21 on the opposite side. Therefore, since the air flowing from the second chamber 222 toward the first chamber 221 is preheated sufficiently high by the heat generated by the combustion operation of the combustion heat source device 4 provided in the first chamber 221, even when the combustion amount is low. , Easy to complete combustion. Further, since it can be operated at a low air ratio, high thermal efficiency can be realized.

FIG. 4 is a partial front sectional view showing another embodiment of the firing furnace according to the present invention. In this embodiment, the combustion heat source device 4 is arranged on the ceiling surface side.

The heat exchange device 6 performs heat exchange between the air introduced into the second chamber 222 and the exhaust gas discharged from the first chamber 221. FIG. 5 is a perspective view showing the configuration of the heat exchange device 6. The heat exchange device 6 includes an air flow passage 61 and an exhaust flow passage 62.
The air flow passage 61 is connected to the outside air and the second chamber 222, and the exhaust flow passage 62 constitutes an exhaust passage adjacent to the air flow passage 61. Therefore, the air supplied to the second chamber 222 is heated by the exhaust gas, and the thermal efficiency is increased. Each of the air flow passages 61 arranged in one direction is connected so that air takes a serial flow path. The exhaust flow passage 62 discharges the exhaust gas that has flowed in from the first chamber 221. In the illustrated embodiment, the air flow passage 61 and the exhaust flow passage 62 are formed by providing through holes in the block, but differently, it is also possible to form them by combining plate materials.

[0019]

As described above, according to the present invention, the following effects can be obtained. (A) Since the combustion chamber is partitioned from the firing chamber by the heat transfer partition, the atmospheric gas in the firing chamber can be selected to have an optimum composition for firing without being affected by the combustion exhaust gas of the combustion heat source device, and a constant quality can be obtained. It is possible to provide a firing furnace capable of obtaining a fired product of (B) Since the combustion chamber is separated from the firing chamber by the heat transfer partition, unlike the radiant tube method, it does not cause an unnecessarily large size, and it is easy to obtain a uniform temperature and a firing furnace with high thermal efficiency is used. Can be provided. (C) a combustion chamber is arranged on at least one side of the firing chamber,
When the heat transfer partition wall constitutes a part of the wall of the firing chamber, it is possible to provide a firing furnace with high thermal efficiency, which makes it easier to obtain uniform heat. The soaking and thermal efficiency are further improved by disposing the combustion chamber on both sides of the firing chamber. (D) The area of the heat transfer partition is 40% of the wall forming the firing chamber.
By selecting above, the soaking degree of the material to be fired is good,
It is possible to provide an economical firing furnace with less quality defects even if the temperature change rate is increased.

[Brief description of drawings]

FIG. 1 is a front partial cross-sectional view of a firing furnace according to the present invention.

FIG. 2 is a partial plan sectional view taken along line A2-A2 of FIG.

FIG. 3 is a front partial cross-sectional view showing another embodiment of the firing furnace according to the present invention.

FIG. 4 is a front partial cross-sectional view showing another embodiment of the firing furnace according to the present invention.

FIG. 5 is a perspective view showing a model of a configuration of a heat exchange device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 furnace body 21 firing chamber 22 combustion chamber 3 object to be fired 4 combustion heat source device

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Makoto Sato 1-13-1 Nihonbashi, Chuo-ku, Tokyo Within TDK Corporation (72) Inventor Tsutomu Tanaka 1-1-13-1 Nihonbashi, Chuo-ku, Tokyo -72K Incorporated (72) Inventor Yoshimasa Yoshimasa, 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Ltd. (72) Inventor Kazumi Kobayashi 1-13-1-1, Nihonbashi, Chuo-ku, Tokyo In TDC Corporation (72) Inventor Tetsuhide Uchikawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDK Corporation (72) Inventor Toshihiro Hamahata 1-13-1 Nihonbashi, Chuo-ku, Tokyo Inside TDC Corporation

Claims (12)

[Claims] 1. A firing furnace having a firing chamber and a combustion chamber, wherein the firing chamber constitutes a space for accommodating an object to be fired, and the combustion chamber has a combustion heat source device, A firing furnace adjacent to the firing chamber and partitioned from the firing chamber by a heat transfer partition. 2. The firing furnace according to claim 1, wherein the combustion chamber is arranged on at least one side of the firing chamber, and the heat transfer partition wall constitutes a part of a wall of the firing chamber. 3. The firing furnace according to claim 2, wherein the combustion chambers are arranged on both sides of the firing chamber. 4. The firing furnace according to claim 2, wherein the heat transfer partition wall has an area of 40% or more of the wall forming the firing chamber. 5. The firing furnace according to claim 1, wherein the combustion chamber has an air supply passage, and the air supply passage constitutes a passage for supplying outside air taken in from the outside. 6. The firing furnace according to claim 5, wherein the combustion chamber is divided into two parts by a partition plate, the combustion heat source is arranged in a first chamber, and the second chamber constitutes the air supply passage. 7. The firing furnace according to claim 6, wherein in the combustion chamber, the first chamber is adjacent to the firing chamber, and the second chamber is located on the outer side opposite to the firing chamber. 8. The firing furnace according to claim 1, further comprising another heat source device, wherein the other heat source device is disposed in the firing chamber. 9. The firing furnace according to claim 8, wherein the other heat source device is an electric heat source. 10. The heat exchange device according to claim 5, wherein the heat exchange device exchanges heat between air introduced into the air supply passage and exhaust gas discharged from the combustion chamber. Firing furnace. 11. The heat exchange device has an air flow passage and an exhaust flow passage, the air flow passage communicates with the outside air and the air supply passage, and the exhaust flow passage communicates with the combustion chamber. The firing furnace according to claim 10, which constitutes an exhaust passage adjacent to the passage. 12. The firing furnace according to claim 10, wherein the heat exchange device is provided in the furnace body.