JP2000154052A - Furnace for ceramic-art object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To uniformize the firing of a ceramic-art formed body and to improve the combustion efficiency in the furnace by dividing a part of the flow of a high temperature gas, used for completely combusting an exhaust gas, from a high temperature gas main stream flowing into the inside of the furnace, allowing the divided steam to flow into a flue, placing at the bottom of the furnace, a part of the flue, that extends from the flow division point to an exhaust gas flow passage, and also placing an air introduction port for forming oxidizing flame, at a midway point of the part of the flue. SOLUTION: In this furnace, a mainstream of a high temperature gas introduced through a high temperature introduction port 16, is allowed to flow into the furnace inside 6 through a flow divider 19 and a furnace inside communicating hole 17, and used for firing a ceramic- art formed body. The exhaust gas formed in the furnace inside 6 is allowed to enter into a first flue 9 and concurrently, moved toward the high temperature gas introduction port 16 and further, allowed to enter into a second flue 11 and concurrently, delivered to an exhaust gas flow passage 12. Also, a part of the high temperature gas introduced is allowed to directly flow into a second flue 11 through the flow divider 19 and a flue communicating hole 18. When the high temperature gas has reducing properties, air introduced from an air introduction port 14 is added to the exhaust gas introduced from right and left communicating holes 10, to again combust the exhaust gas, to form oxidizing flame and to subject uncombusted matter in the high temperature gas to complete combustion before the high temperature gas reaches an exhaust gas communicating hole 13.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a pottery furnace using a kerosene burner or the like.

[0002]

2. Description of the Related Art As a pottery furnace, Japanese Patent Publication No. 2748131 discloses a pottery molded product inside a furnace through which a oxidizing or reducing high-temperature gas is introduced from a high-temperature gas inlet provided at the bottom of the furnace and through a flow dividing device. Is used for sintering and complete combustion of exhaust gas sent out of the furnace through a flue to an exhaust passage, and is used as a substantially completely burned exhaust gas, which is discharged to the outside from the exhaust passage. What is made is disclosed.

According to the pottery furnace, when a pottery molded article is fired in a reducing atmosphere using a reducing high-temperature gas in order to obtain a pottery work rich in change, exhaust gas in an incomplete combustion state is exhausted. It can be completely burned on the road and can prevent the emission of soot to the external environment, so that it can be used in residential areas and the like without causing any pollution.

However, in the conventional pottery furnace, a high-temperature gas for complete combustion of the exhaust gas is diverted to an exhaust passage partitioned from the inside of the furnace, and complete combustion of the exhaust gas is performed in the exhaust passage. This is done, and as can be said for all pottery furnaces using this kind of high-temperature gas, the temperature near the exhaust passage is lower than near the high-temperature gas inlet inside the furnace, and there is a small amount between both areas. In addition, a temperature difference occurs, which leads to a decrease in combustion efficiency, and makes it difficult to uniformly fire a ceramic molded product, which sometimes causes a trouble in the firing operation.

[0005]

The problem to be solved by the present invention is to reduce the temperature difference between the vicinity of the high-temperature gas inlet and the vicinity of the exhaust passage inside the furnace and to make the temperature distribution inside the furnace uniform. Accordingly, it is an object of the present invention to provide a pottery furnace capable of uniformly firing a pottery molded article and improving combustion efficiency.

[0006]

The pottery furnace according to the present invention comprises:
An oxidizing or reducing high-temperature gas is introduced from a high-temperature gas inlet provided in a furnace bottom or a lower part of a furnace body, and a ceramic molded article is baked in the furnace through a branching device and exhausted from a furnace through a flue. In a pottery furnace, which is divided and used for complete combustion of exhaust gas sent out to the flow path and is discharged to the outside from the exhaust flow path as substantially completely burned exhaust gas, The hot gas for complete combustion is diverted to the flue, and at least the flue section from the hot gas diverting position to the exhaust flow path in the flue is arranged at the furnace bottom and at the intermediate position of the flue section. It is characterized in that an air inlet for oxidizing flame is provided.

In the above structure, when the high-temperature gas from the high-temperature gas inlet is reducing, the exhaust gas in an incompletely combusted state is completely burned in the flue from the hot gas diverting position to the exhaust passage. The exhaust gas is discharged from the exhaust passage without containing soot. In this case, a part of the reducing high-temperature gas from the high-temperature gas inlet is directly diverted into the flue portion, and air is added from the air inlet to generate an oxidizing flame. The exhaust gas in the completely burned state is ignited by the oxidizing flame to burn its combustible components, and is turned into a completely burned exhaust gas containing no black smoke or soot. Further, since the flue portion is disposed at the bottom of the furnace, the combustion heat generated at the time of the complete combustion in the flue portion is a portion of the furnace bottom near the exhaust passage away from the high-temperature gas inlet, that is, the furnace. It raises the temperature of the lowest temperature part inside, thereby improving the combustion efficiency and consequently reducing the fuel consumption. In this regard, in the above-described conventional technology, the high-temperature gas for complete combustion of the exhaust gas is diverted to an exhaust passage partitioned outside the furnace and air is added thereto, and the exhaust gas is exhausted through the exhaust passage. Therefore, this structure cannot make the temperature distribution inside the furnace uniform and cannot effectively use the combustibles in the exhaust gas in the incomplete combustion state. In the present invention, even when the high-temperature gas from the high-temperature gas inlet is oxidizing, the temperature of the furnace bottom is increased by diverting a part of the high-temperature gas to the flue portion by the flow dividing device. The temperature distribution inside the furnace can be made uniform.

[0008] In the ceramic pottery furnace having the above-mentioned structure, the hot gas may be introduced from one hot gas inlet and exhaust gas generated from the hot gas may be sent to one exhaust flow path. In order to obtain a more uniform temperature distribution inside the furnace, for example, hot gas inlets are separately provided on opposite sides of the furnace bottom or the lower portion of the furnace body, and a common exhaust passage is provided for the hot gas introduction on both sides. The hot gas is introduced between two hot gas inlets separated from each other, and each exhaust gas generated from the hot gas is supplied to one common exhaust flow provided between the hot gas inlets on both sides. It can also be configured to be sent to the road.

In order to easily adjust the temperature and temperature distribution inside the furnace, the combustion state in the flue section, etc., it is preferable that the flow dividing device has a high temperature inside the furnace and the flue section toward the exhaust passage. It is preferable to be able to adjust the flow rate of each branch of the gas. When the hot gas from the hot gas inlet is oxidizing, as described above, the flow rate of each branch of the hot gas to the inside of the furnace and to the flue section toward the exhaust passage is adjusted and the flue section is controlled. By introducing an oxidizing high-temperature gas into the furnace, the temperature distribution inside the furnace can be made uniform. When the high-temperature gas from the high-temperature gas inlet is reducing, as described above, the flow rate of each of the high-temperature gas to the inside of the furnace and the flue portion toward the exhaust flow path is adjusted and the smoke is reduced. By generating the oxidizing flame in the road portion, it is possible to achieve complete combustion of the exhaust gas and thereby to make the temperature distribution inside the furnace uniform.

[0010]

FIG. 1 is a longitudinal sectional view of a pottery furnace according to a first embodiment of the present invention, wherein FIG. B) shows a cut in the inner second flue. FIG. 2 is a plan view of the pottery furnace shown in FIG. 1 with a furnace lid removed.

In the figure, a pottery furnace 1 includes a furnace bottom 2, a furnace body 3, a furnace cover 4, and a chimney 5, and the furnace bottom 2 communicates with the furnace interior 6 through a vertical communication hole 7 in front of the furnace. A first flue 9 surrounded by the body 3 and each partition 8 is disposed on both sides, and communicates with the first flue 9 via a left and right communication hole 10 at the rear, and is surrounded by the partition 8 on both sides. The second flue 11 is located in the center,
The second flue 11 communicates with an exhaust passage 12 in the chimney 5 through a front exhaust communication hole 13, and an air inlet 14 is provided in the furnace bottom 2 at an intermediate position of the second flue 11. Has been drilled. At the rear end of the furnace bottom 2, a hot gas inlet 16 of a kerosene burner 15 that generates oxidizing or reducing hot gas is opened, and the hot gas inlet 16 is connected to the inside 6 of the furnace and the second flue 11 respectively. A communication device 19 is provided through the in-furnace communication hole 17 and the flue communication hole 18, and a flow dividing device 19 is provided between the high-temperature gas inlet 16 and the in-furnace communication hole 17 and the flue communication hole 18.

In the above configuration, of the oxidizing or reducing high-temperature gas introduced from the high-temperature gas inlet 16, the main stream is supplied to the inside of the furnace 6 through the flow dividing device 19 and the communication hole 17 in the furnace.
As it enters, it is served for firing of ceramics moldings (not shown),
The exhaust gas generated by the combustion enters the first flue 9 through the upper and lower communication holes 7 and moves toward the high-temperature gas inlet 16 as shown in FIG. As shown in (B), the gas enters the second flue 11 through the left and right communication holes 10 and the exhaust passage 1 through the exhaust communication holes 13.
2 and discharged from the chimney 5. In addition, a part of the oxidizing or reducing high-temperature gas introduced from the high-temperature gas inlet 16 is supplied to the second smoke through the flow dividing device 19 and the flue communication hole 18 as shown in FIG. Directly into Road 11,
When the high-temperature gas is reductive, the air from the air inlet 14 is added to the exhaust gas introduced from the left and right communication holes 10 and recombusted, generating an oxidizing flame, and the non-combustible The part is completely burned between the air inlet 14 and the exhaust communication hole 13.

The oxidizing or reducing high-temperature gas introduced from the high-temperature gas inlet 16 is supplied to the flow dividing device 19 as described above.
Through the furnace 6 and the second flue 11 at a required distribution. 3A and 3B are cross-sectional views of a flow dividing device in the pottery furnace shown in FIG. 1, wherein FIG. 3A shows a state in which the high-temperature gas is distributed to both the inside of the furnace and the second flue, and FIG. It shows a state distributed only inside the furnace, and the flow dividing device 19
It is possible to continuously adjust the flow rate of each branch of the high-temperature gas into the furnace interior 6 and the second flue 11 between the state (A) and the state (B). In FIG.
Reference numeral 9 denotes an adjustment block 20 having a triangular cross section suspended from the ceiling at the rear end of the second flue 11 and a slide plate 21 slidably contacting the furnace bottom 2. The rectangular adjustment hole 22 of the moving plate 21 is disposed to face. In FIG. 3A, the slide plate 21 is adjusted so that the front end of the adjustment hole 22 is disposed slightly forward of the front end of the adjustment block 20. In this case, the high-temperature gas introduced from the high-temperature gas introduction port 16 is used. Is diverted into the furnace interior 6 and the second flue 11 via the in-furnace communication hole 17 and the flue communication hole 18, respectively. In FIG. 2B, the slide plate 21 is adjusted so that the front end of the adjustment hole 22 is aligned with the front end of the adjustment block 20. In this case, the high-temperature gas introduced from the high-temperature gas inlet 16 is It is introduced only into the furnace interior 6 through the furnace communication hole 17.

Embodiment 2 FIG. 4 is a vertical cross-sectional view of a pottery furnace according to a second embodiment of the present invention, taken along a second flue inside, and FIG. 5 is a vertical sectional view of the pottery furnace shown in FIG. It is a plane perspective view at the time of removing the furnace lid and the upper part of the flue.

In FIG. 1, a pottery furnace 1 according to a second embodiment is shown.
Means that the two pottery furnaces shown in Example 1 described above are
Of the oxidizing or reducing high-temperature gas introduced from each of the high-temperature gas inlets 16 on both sides, the main stream is separated through the respective flow dividing devices 19 into the furnace interior 6 on each side.
The exhaust gas generated by the combustion enters the first flue 9 and moves toward the high-temperature gas inlet 16, and is further subjected to the firing of the ceramics molded product.
, And is sent out to the lower exhaust passage 12 through the common exhaust communication hole 13 and discharged from the chimney 5. A part of the oxidizing or reducing high-temperature gas introduced from each high-temperature gas inlet 16 directly enters each second flue 11 through each branching device 19, and the high-temperature gas is reduced. In this case, the air from each air inlet 14 is added to the exhaust gas introduced from each of the left and right communication holes 10 and recombusted to generate an oxidizing flame. Complete combustion is performed between the port 14 and each exhaust communication hole 13.

[0016]

The pottery furnace according to the first aspect of the present invention is constructed as described above, and the oxidizing or reducing high-temperature gas passes through the flow dividing device not only to the inside of the furnace but also to the flue section toward the exhaust passage. So that the temperature difference between the vicinity of the high-temperature gas inlet and the vicinity of the exhaust passage inside the furnace is reduced, and the temperature distribution inside the furnace is made uniform, so that uniform firing and combustion of the pottery molded product is achieved. Enables increased efficiency.

According to the second aspect of the present invention, since the bottom of the furnace near the common exhaust passage in the middle of the furnace is heated from both sides by the high-temperature gas in each of the flue portions, a more uniform temperature inside the furnace is obtained. A distribution is obtained. According to the third aspect, the high-temperature gas from the high-temperature gas inlet is freely diverted to the inside of the furnace and the flue portion toward the exhaust flow passage at an appropriate required distribution, so that the inside of the furnace and the flue portion can be separated. Temperature adjustment and the like can be easily performed. According to the present invention, when the high-temperature gas from the high-temperature gas inlet is oxidizing, the temperature of the flue portion and the furnace bottom is increased by introducing the oxidizing high-temperature gas into the flue portion, and the inside of the furnace is increased. Temperature distribution can be made uniform. According to the fifth aspect of the present invention, when the high-temperature gas from the high-temperature gas inlet is reducing, the temperature of the flue portion and the bottom of the furnace is increased by reburning the exhaust gas in the flue portion, and the inside of the furnace is increased. The temperature distribution can be made uniform, and the pottery molded product inside the furnace can be reduced and fired in a required reducing atmosphere, and exhaust gas in a completely burned state containing no soot can be discharged.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a pottery furnace according to a first embodiment of the present invention, in which (A) is cut in a first flue on the outside, and (B) is a second flue on the inside. In FIG.

FIG. 2 is a plan view of the pottery furnace shown in FIG. 1 with a furnace lid removed.

3A and 3B are cross-sectional views of a flow dividing device in the pottery furnace shown in FIG. 1, wherein FIG. 3A shows a state in which high-temperature gas is distributed to both the inside of the furnace and a second flue, and FIG. This shows a state of distribution only inside the furnace.

FIG. 4 is a vertical cross-sectional view of a pottery furnace according to a second embodiment of the present invention, taken along a second flue inside.

5 is a plan perspective view of the pottery furnace shown in FIG. 4 when a furnace lid and an upper portion of a flue are removed.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Ceramic art furnace 2 Furnace bottom 6 Furnace interior 9 First flue 11 Second flue 12 Exhaust flow path 14 Air inlet 16 Hot gas inlet 19 Separating device

Claims (5)

[Claims] An oxidizing or reducing high-temperature gas is introduced from a high-temperature gas inlet provided in a furnace bottom or a lower part of a furnace body, and a ceramics molded article is baked in the furnace through a branching device and smoke is generated from the furnace. In a pottery furnace which is used by being diverted for complete combustion of exhaust gas sent out to an exhaust passage through a road, and is discharged from the exhaust passage to the outside as substantially completely burned exhaust gas. Diverting the hot gas for complete combustion of the exhaust gas into the flue, and arranging at least a portion of the flue in the flue from the hot gas diverting position to the exhaust passage at the furnace bottom, A pottery furnace characterized by having an air inlet for generating an oxidizing flame at an intermediate position of the portion. 2. The pottery furnace according to claim 1, wherein hot gas inlets are individually provided on opposite sides of the furnace bottom or the lower part of the furnace body, and a common exhaust passage is provided between the hot gas inlets on both sides. 3. The pottery furnace according to claim 1, wherein the flow dividing device is capable of adjusting the flow rate of each branch of the high-temperature gas to the inside of the furnace and to a flue portion toward the exhaust flow path. 4. When the high-temperature gas from the high-temperature gas inlet is oxidizing, the flow rate of each branch of the high-temperature gas to the flue section toward the inside of the furnace and the exhaust passage is adjusted, and the high-temperature gas is oxidized. The pottery furnace according to claim 1, wherein a high-temperature gas having a characteristic property is introduced. 5. When the high-temperature gas from the high-temperature gas inlet is reducing, the flow rate of each branch of the high-temperature gas to the flue section toward the inside of the furnace and the exhaust passage is adjusted, and oxidation is performed in the flue section. 4. The pottery furnace according to claim 1, wherein the flame is generated.