JPH063063A - Kiln - Google Patents

Abstract

PURPOSE:To provide a kiln including a simple structure, high heat efficiency heat exchanger system, CONSTITUTION:A first kiln chamber 21 is surrounded by a kiln body 1 and constitutes a space for containing an article 3 to be calcined. A burning heat source device 4 heats the kiln chamber 21. A heat exchange device 6 is assembled in the kiln body 1 to exchange heat between burning air introduced into a second kiln chamber 22 and burned exhaust gas exhausted from the second kiln chamber 22.

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 a combustion heat source is used, a heat exchange device is used as a means to improve thermal efficiency,
BACKGROUND ART A heat exchange system is known in which heat is exchanged between combustion exhaust gas and combustion air supplied to a combustion heat source, the combustion air is preheated, and the preheated combustion air is supplied to a burner that constitutes the combustion heat source. In the conventional heat exchange system, the heat exchange device is installed outside the firing furnace, and the two are connected by piping.

[0003]

As described above, in the conventional heat exchange system, the heat exchange device is installed outside the firing furnace, and the two are connected by the pipe, so that the pipe structure becomes complicated. However, there is a problem that the heat efficiency is lowered due to the heat radiation by the piping.

Therefore, an object of the present invention is to have a simple structure,
An object of the present invention is to provide a firing furnace having a heat exchange system with high thermal efficiency.

[0005]

In order to solve the above-mentioned problems, the present invention is a firing furnace including a furnace chamber, a combustion heat source device, and a heat exchange device, wherein the furnace chamber comprises a furnace body. It is enclosed and constitutes a space for storing the material to be fired, the combustion heat source device is for heating the furnace chamber, and the heat exchange device is incorporated in the furnace body and introduced into the furnace chamber. Heat is exchanged between the combustion air and the combustion exhaust gas discharged from the furnace chamber.

[0006]

The furnace chamber is surrounded by the furnace body and constitutes a space for accommodating the material to be fired, and the combustion heat source device heats the furnace chamber, so that a firing furnace with a low running cost can be obtained.

Since the heat exchange device performs heat exchange between the combustion air introduced into the furnace chamber and the combustion exhaust gas discharged from the furnace chamber, the heat energy of the combustion exhaust gas is used to generate the combustion air. A firing furnace having a heat exchange system for heating is obtained.

Since the heat exchange device is incorporated in the furnace body, no piping is required between the heat exchange device and the furnace chamber. For this reason, the structure is simplified, the amount of heat radiation is significantly reduced as compared with the conventional one, and the thermal efficiency of the entire firing furnace is improved.

[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 body, 21 is a first furnace chamber, 22 is a second furnace chamber, 3 is a material to be fired, 4 is a combustion heat source device, 5 is another heat source device, and 6 is a heat exchange device. Furnace body 1
Is formed by using refractory bricks and the like. First furnace room 2
1 constitutes a space for accommodating the object to be fired 3. The second furnace chamber 22 has the combustion heat source device 4, is adjacent to the first furnace chamber 21, and is partitioned from the first furnace chamber 21 by the refractory heat transfer wall 23. Unlike the illustration, the furnace chamber may have a general structure in which the first furnace chamber 21 and the second furnace chamber 22 are not partitioned.

The object to be fired 3 is a ceramic product containing an organic binder, or the ceramic product is placed inside a heat-resistant case, and is placed on the heat-resistant base plate 9 to be placed in the first furnace chamber 21.
It is stored inside. The combustion heat source device 4 is arranged inside the second furnace chamber 22. The combustion heat source device 4 is a gas burner,
For example, an oil burner.

The heat exchange device 6 is installed inside the furnace body 1 and exchanges heat between the combustion air introduced into the second furnace chamber 22 and the combustion exhaust gas discharged from the second furnace chamber 22. To do.
FIG. 3 is a perspective view showing the configuration of the heat exchange device 6. The heat exchange device 6 includes a combustion air flow passage 61 and a combustion exhaust gas flow passage 6
2 and the combustion air flow passage 61 is provided in the outside air and the second furnace chamber 2
2, the combustion exhaust gas flow passage 62 constitutes a combustion exhaust gas passage adjacent to the combustion air flow passage 61. In each of the combustion air flow passages 61 arranged in one direction, the air flows through the arrow b1.
To b2 are connected so as to take a series flow path. The combustion exhaust gas flow passage 62 discharges the combustion exhaust gas that has flowed in from the second furnace chamber 22 as indicated by arrow b3, as indicated by arrow b4.

In the illustrated embodiment, the combustion air flow passage 61 and the combustion exhaust gas flow passage 62 are formed by providing through holes in the block, but differently, they can be formed by combining plate materials. Is. FIG. 4 shows an example thereof.
In FIG. 4, the same reference numerals as those in FIG. 3 denote the same components, and 63 to 68 are heat resistant plate materials. Combining the plate members 63 to 68 makes the combustion air flow passage 6
1 and a combustion exhaust gas flow passage 62 are formed.

As described above, the first furnace chamber 21 is surrounded by the furnace body 1 and constitutes a space for accommodating the object 3 to be fired,
Since the combustion heat source device 4 heats the first furnace chamber 21, the combustion heat source device 4 can be used as a heat source for burning the object 3 to be fired in the first furnace chamber 21 to obtain a low-cost running firing furnace.

Since the heat exchange device 6 performs heat exchange between the combustion air introduced into the second furnace chamber 22 and the combustion exhaust gas discharged from the second furnace chamber 22, the heat energy of the combustion exhaust gas is exchanged. A firing furnace having a heat exchange system for heating combustion air is obtained.

Since the heat exchange device 6 is incorporated in the furnace body 1, no pipe is required between the heat exchange device 6 and the second furnace chamber 22. For this reason, the structure is simplified, the amount of heat radiation is significantly reduced as compared with the conventional case, and the thermal efficiency of the heat exchange system is improved.

In the embodiment, since the second furnace chamber 22 is separated from the first furnace chamber 21 by the heat transfer wall 23, product interference due to the combustion operation of the combustion heat source device 4 is prevented, and a baked product of a constant quality is obtained. Is obtained. Further, even when the combustion operation of the combustion heat source device 4 changes, there is no particular interference with the oxygen concentration in the first furnace chamber 21. Further, since the indirect heating is performed via the heat transfer wall 23, there is no unevenness in the binder removal, and quality defects such as cracks are reduced.

Further, since the second furnace chamber 22 is divided from the first furnace chamber 21 by the heat transfer wall 23, the size of the second furnace chamber 22 is not increased more than necessary. Also, it is easy to take uniform heat,
The loading space loss is also minimal. Moreover, since the first furnace chamber 21 and the second furnace chamber 22 are adjacent to each other with the heat transfer wall 23 therebetween, the thermal efficiency is increased.

The second furnace chamber 22 is divided into two parts by a partition plate 223, and the combustion heat source device 4 is arranged in the first chamber 221.
The second chamber 222 constitutes an air supply passage. 2nd chamber 22
Reference numeral 2 constitutes an air supply for supplying outside air taken in from the outside to the first chamber 221. Therefore, in the case of this embodiment,
The heat exchanging device 6 is configured such that the air introduced into the second chamber 222 is
Heat is exchanged with the combustion exhaust gas discharged from the chamber 221.

In the embodiment, the heat source device 5 is the object to be fired 3
It is used as a heat source for obtaining a part of the heat required for calcination, and the combustion heat source device 4 supplies most of the necessary heat as its 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 gas burner, an oil burner, or the like, the heat energy cost is lower than that when an electric heat source is used alone.

FIG. 5 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 second furnace chamber 22, the first chamber 221 is adjacent to the first furnace chamber 21, and the second chamber 222 is located outside the first furnace chamber 21 on the opposite side. Therefore, the air flowing from the second chamber 222 toward the first chamber 221 is preheated by the heat generated by the combustion operation of the combustion heat source device 4 provided in the first chamber 221, so that the thermal efficiency is increased.

FIG. 6 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.

[0022]

As described above, according to the present invention, the following effects can be obtained. (A) Since the furnace chamber is surrounded by the furnace body and constitutes a space for storing the material to be fired, and the combustion heat source device heats the furnace chamber, it is possible to provide a firing furnace with low running cost. (B) The heat exchange device includes combustion air introduced into the furnace chamber,
Since heat is exchanged with the combustion exhaust gas discharged from the furnace chamber, it is possible to provide a firing furnace having a heat exchange system that heats combustion air by using the thermal energy of the combustion exhaust gas. (C) Since the heat exchange device is incorporated in the furnace body, a firing furnace having a simple structure and high thermal efficiency can be provided.

[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 perspective view showing a model of a configuration of a heat exchange device used in the present invention.

FIG. 4 is a modeled perspective view showing another configuration example of the heat exchange device used in the present invention.

FIG. 5 is a front partial cross-sectional view showing another embodiment of the firing furnace according to the present invention.

FIG. 6 is a front partial cross-sectional view showing another embodiment of the firing furnace according to the present invention.

[Explanation of symbols]

 1 Furnace Body 21 Furnace Room 22 Second Furnace Room 3 Burned Material 4 Combustion Heat Source Device 6 Heat Exchanger

Front page continued (72) Inventor Makoto Sato 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation (72) Inventor Tsutomu Tanaka 1-1-13-1 Nihonbashi, Chuo-ku, Tokyo TDK Corporation (72) Inventor Yoshimasa Yoshimasa 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (72) Inventor Kazumi Kobayashi 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (72) Inventor Tetsuhide Uchikawa 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (72) Inventor Toshihiro Hamahata 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation

Claims (3)

[Claims] 1. A firing furnace including a furnace chamber, a combustion heat source device, and a heat exchange device, wherein the furnace chamber is surrounded by a furnace body and constitutes a space for storing a material to be fired, The combustion heat source device is for heating the furnace chamber, the heat exchange device is incorporated in the furnace body, combustion air introduced into the furnace chamber, and combustion exhaust gas discharged from the furnace chamber A firing furnace that exchanges heat with 2. The heat exchange device has a combustion air flow passage and a combustion exhaust gas flow passage, and the combustion air flow passage and the combustion exhaust gas flow passage are arranged adjacent to each other. The firing furnace according to Item 1. 3. The furnace chamber has an inner wall composed of a heat transfer wall and a reflection wall, and the combustion heat source device heats the furnace chamber via the heat transfer wall. Firing furnace.