JPH10238953A - Vertical moving furnace - Google Patents

Abstract

PROBLEM TO BE SOLVED: To particularly improve a heat exchange efficiency in a preheating zone by sequentially forming the preheating zone, baking zone and a cooling zone from above in a vertical furnace body, and providing a moving route for moving a material to be baked from an upper end of the body toward a lower end in the body, thereby uniforming temperature distribution in the same section of the body. SOLUTION: A vertical furnace body 1 continued in a vertical direction is, for example, formed in a cylindrical state, and a preheating zone 2, a baking zone 3 and a cooling zone 4 are sequentially formed from above the body 1. An exhaust duct 5 is provided on an outer periphery of the zone 2 to suck atmospheric gas rising from below the body 1. High temperature baking gas of many baking burners 6 provided on an outer periphery of the zone 3 is raised in the body 1 buoyancy, sucked by the duct 5 of the zone 2, and shooting nozzle 7 of cooling air is provided on an outer periphery of the zone 4. A moving route obtained by stacking a kiln implement 8 for transferring material to be baked from an upper end of the body toward a lower end of the body is provided at a center of the body 1 in a vertical direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a vertical moving furnace suitable for continuous firing of various ceramic products.

[0002]

2. Description of the Related Art Roller hearth kilns have been widely used for continuous firing of relatively small ceramic products such as tiles, tableware and ferrite. As is well known, this roller hearth kiln arranges a large number of driving rollers at a constant pitch inside a tunnel-shaped furnace body, puts an object to be fired thereon and moves the inside of the furnace horizontally, while preheating,
The firing and cooling steps are sequentially performed. However, this roller heart kiln had the following problems.

[0003] First, the temperature distribution of the roller hearth kiln tends to be non-uniform within the same cross section of the furnace body, and particularly, the temperature distribution in the vertical direction becomes large, and the quality to be fired tends to vary. Secondly, in the pre-tropical zone of the roller hearth kiln, heat exchange is performed between the high-temperature gas flowing from the firing zone and the product to be fired, and the product to be fired is preheated. Since it mainly flows in the nearby space, the heat exchange efficiency with the article to be fired is poor. At present, this heat exchange efficiency is almost 36
Only about%.

[0004] Third, in the roller hearth kiln, an exhaust fan is installed near the entrance of the furnace to suck the gas flowing from the firing zone, but this exhaust fan also sucks outside air at the same time. Low-temperature outside air flows into the furnace and deteriorates the heating efficiency of the furnace. Fourth, since bending stress due to the load of the article to be fired and torsion stress due to rotation act on the rollers of the roller hearth kiln at high temperatures, accidents such as breakage are likely to occur.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned conventional problems, has a uniform temperature distribution in the same cross section of the furnace body, has a high heat exchange efficiency in the pre-tropical zone, and has a low-temperature air. Has been made in order to provide a furnace which is not sucked into the furnace, has no risk of accidents such as breakage of rollers and the like, and can perform continuous firing similar to a roller hearth kiln.

[0006]

Means for Solving the Problems A vertical moving furnace according to the present invention made to solve the above-mentioned problems is provided in a vertical furnace body which is continuously connected in a vertical direction from the top to the bottom in a pre-tropical manner. A sintering zone and a cooling zone are sequentially formed, and a moving path for moving an object to be fired from the upper end of the furnace body to the lower end of the furnace body is provided inside the furnace body. In addition, it is preferable that the above-mentioned route of the article to be fired is formed by a laminated kiln tool.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, reference numeral 1 denotes a vertical furnace body which is continuous in a vertical direction, and has a cylindrical shape, for example. 2 is a pre-tropical zone formed above the furnace body 1,
Reference numeral 3 denotes a firing zone formed below the pre-tropical zone 1 and reference numeral 4 denotes a cooling zone formed below the furnace body 1.

[0008] The pre-tropical zone 2 is provided with an exhaust duct 5 on the outer periphery, and sucks an atmospheric gas rising from below the furnace body 1. The firing zone 3 is provided with a large number of firing burners 6 on the outer periphery. The type of the burning burner 6 is not particularly limited, but a surface burning burner is arranged in the example of FIG. Although the surface combustion burner can perform uniform radiant heating, even a normal burner can be uniformly heated by arranging a plurality of burners so as to form a swirling flow within the same horizontal cross section. The high-temperature combustion gas of the firing burner 6 rises in the furnace body 1 by buoyancy, reaches the pre-tropical zone 2, and is sucked by the exhaust duct 5. The cooling zone 4 is provided with a cooling air injection nozzle 7 on the outer periphery.

At the center of the furnace body 1 which is continuous in the vertical direction, a moving path for moving the article to be fired from the upper end of the furnace body to the lower end of the furnace body is provided. This travel route is
It is formed by laminating kiln tools 8 such as setters and saggers. That is, as shown in the figure, a kiln tool 8 in which articles to be fired are set is vertically stacked at the center of the furnace body 1, and the kiln tools 8 are charged one by one from the upper end of the furnace body, and the kiln tools 8 are loaded from the lower end of the furnace body. By taking out one by one, the article to be fired is moved downward. Elevating means capable of supporting the weight of the stacked kiln tools 8 is provided at the bottom.

The article to be fired, which has been charged into the furnace body 1 from the upper end of the furnace body, is brought into contact with a high-temperature atmosphere gas rising from the sintering zone 3 to perform heat exchange and is preheated. Since the furnace body 1 of the present invention has a chimney shape as a whole, it has a chimney effect, whereby a uniform flow of atmospheric gas is formed around the kiln tool 8 by a large ventilation pressure. As a result, the temperature distribution in the cross section direction of the furnace body 1 becomes uniform, and the heat exchange efficiency can be improved from about 36% of the related art to about 50 to 70%.

Subsequently, the article to be fired is fired in the firing zone 3 and further cooled by the cooling air from the driving nozzle 7 while passing through the cooling zone 4. Firing zone 3 and cooling zone 4
However, since the temperature distribution in the cross-sectional direction becomes uniform, the variation in the quality of the product to be fired is smaller than that of the roller hearth kiln. The products to be fired that have passed through the cooling zone 4 are taken out one by one from the lower end of the furnace body.

[0012]

As described above, the vertical moving furnace of the present invention
Although it is possible to continuously fire the article to be fired in the same manner as the conventional roller hearth kiln, it has many advantages as described below as compared with the roller hearth kiln. Since the furnace body is vertically shaped continuously in the vertical direction,
The temperature distribution within the same cross section of the furnace body is uniform, and the quality to be fired hardly varies. The heat exchange efficiency in the pre-tropics has been increased from 36%
It can be improved to about 0 to 70%. Since the pre-tropical zone is provided at the upper part of the furnace body, the exhaust duct of the pre-tropical zone can exhaust only the atmospheric gas rising from below, and does not suck the outside air unlike the conventional case. Therefore, the furnace temperature does not decrease due to the outside air, and the heating efficiency of the furnace can be improved. The kiln tool set with the products to be fired does not generate bending stress or torsional stress unlike the roller of the roller hearth kiln, and mainly generates only compressive stress. Therefore, there is almost no possibility of destruction. The floor area occupied by the sintering equipment is reduced, and the area productivity can be improved.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vertical moving furnace of the present invention.

[Explanation of symbols]

1 vertical furnace, 2 pre-tropical, 3 firing zone, 4 cooling zone, 5 exhaust duct, 6 firing burner, 7 cooling air injection nozzle, 8 kiln tools

Claims (2)

[Claims] 1. A pre-tropical zone, a sintering zone, and a cooling zone are sequentially formed in a vertical furnace body extending vertically from the upper side to the lower side, and a furnace is provided inside the furnace body from an upper end of the furnace body. A vertical moving furnace provided with a moving path for moving an article to be fired toward a lower end of a body. 2. The vertical moving furnace according to claim 1, wherein a moving path of the article to be fired is formed by laminated kiln tools.