JPH05187779A - Batch type baking furnace - Google Patents

Abstract

PURPOSE:To obtain a batch type baking furnace in which a an object to be baked can be in a short time and products having uniform characteristics can be obtained. CONSTITUTION:A batch type baking furnace 1 has an electric heater 5 whose elements are spaced in the vertical direction in a baking chamber 3 for containing a material S to be baked. A gas burner 6 is mounted at an upper part of a sidewall 3a of the chamber 3, and an exhaust passage 7 is provided in a hearth 4 for blocking a lower side opening of the chamber 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a batch type firing furnace, and more particularly, to a heating source for the same.

[0002]

2. Description of the Related Art Conventionally, many batch-type firing furnaces have been used for heat-treating a small amount of various kinds of articles, and although not shown, these batch-type firing furnaces include a heating source. There are a structure using a gas-fired burner and a structure using an electric heater. And
In a batch-type firing furnace that uses a gas-fired burner as a heating source, the calorific value of the fuel gas is large, so the fuel cost will be low and rapid heating will be possible, and the required processing time for the article to be fired will be short There are advantages such as. On the other hand, the batch-type firing furnace using an electric heater has an advantage that the temperature in the firing chamber can be easily controlled and a product having uniform characteristics can be easily obtained.

[0003]

However, each of these batch-type firing furnaces has drawbacks which are contradictory to each other. That is, it is very difficult to control the temperature and atmosphere of the firing chamber in a batch type firing furnace that uses a gas-fired burner, and the batch type firing furnace having a structure in which an electric heater is used for heating requires a long processing time for the material to be fired. The disadvantage is that the operating cost is high.

The present invention was devised to eliminate these disadvantages, and required a short processing time for the material to be fired, and also batch-type firing capable of obtaining a product having uniform characteristics. It is intended to provide a furnace.

[0005]

In order to achieve such an object, the batch-type firing furnace according to the present invention is arranged in the firing chamber for accommodating the article to be fired so as to be separated along the height direction. The electric heating heater is installed, and the gas-fired burner is installed on the upper part of the side wall of the firing chamber, while the exhaust passage is provided inside the hearth that closes the lower opening of the firing chamber. It is a feature.

[0006]

According to the above construction, only the electric heater installed at the required position in the height direction of the firing chamber is shortened while the required processing time for the work to be fired is shortened by the rapid heating using the gas-fired burner. By driving, it becomes possible to appropriately control the temperature in the firing chamber.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a vertical cross-sectional side view showing a schematic structure of a batch type firing furnace according to this embodiment, and FIG. 2 is a cross-sectional plan view taken along the line AA of FIG. It is a type firing furnace.

A batch type firing furnace 1 according to this embodiment comprises a furnace body 2 made of refractory material or heat insulating material.
Inside the furnace body 2 is provided a firing chamber 3 for accommodating the articles S to be fired, which are placed in parallel and spaced apart from each other. An opening through which the material S to be fired is put in and taken out is formed on the lower side of the firing chamber 3, and the lower side opening is closed by the rise of the hearth 4 configured to be able to move up and down. It has become. That is, the to-be-sintered object S mentioned here is one in which a casket or the like containing a ceramic molded body is stacked in multiple stages, and the to-be-sintered object S is placed on the lowered hearth 4 and then As the hearth 4 rises, it is stored in the firing chamber 3.

Then, inside the firing chamber 3, they are spaced apart along the height direction, and are horizontally arranged through the respective side portions of the articles S to be fired arranged in parallel on the hearth 4. A plurality of electric heaters 5 are installed. Although illustration and description of the electric power supply and control system for the electric heater 5 are omitted, a predetermined number of these electric heaters 5 are grouped along the height direction, and
It is configured so that drive control can be performed for each group.

A gas-fired burner 6 is installed above the side wall 3a of the firing chamber 3, and the gas-fired burner 6 is installed.
Are arranged at positions facing each other with the firing chamber 3 sandwiched therebetween. Further, an exhaust passage 7 for discharging combustion gas to the outside of the furnace is provided inside the hearth 4 that closes the lower opening of the firing chamber 3, and each exhaust passage 7
Each of the gas inlets 7 a connected to is opened on the upper surface of the hearth 4. Therefore, the high-temperature combustion gas ejected from the gas-fired burner 6 flows through the firing chamber 3 from the upper side to the lower side to heat the article to be fired S, and then to the exhaust passage 7 through the gas inlet 7a. After flowing in, it will be discharged out of the furnace. It should be noted that the illustration and description of the fuel gas supply and exhaust system to these gas-fired burners 6 are omitted.

Therefore, in the batch type firing furnace 1, the object S to be fired is rapidly heated by using the gas-fired burner 6 which requires a low fuel cost, and the combustion gas flowing in the firing chamber 3 is biased. By driving the electric heaters 5 of the group in the region where the temperature rise is insufficient and controlling them, it is possible to make the overall temperature distribution in the baking chamber 3 uniform. Furthermore, depending on the material to be fired S, heating in an atmosphere adjusted to have a predetermined component may be required. In such a case, only the electric heater 5 that is easy to control the temperature and the atmosphere is used. As a result, the material to be fired S should be heated.

[0013]

As described above, according to the batch type firing furnace of the present invention, the required processing time of the article to be fired is shortened by the rapid heating using the gas-fired burner, and it is installed at the required portion. It is possible to appropriately control the temperature in the firing chamber by driving the electric heater. Therefore, it is possible to obtain an effect that a required treatment time for the material to be fired is short and a product having uniform characteristics can be obtained.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view showing a schematic structure of a batch type firing furnace according to the present embodiment.

FIG. 2 is a cross-sectional plan view taken along the line AA of FIG.

[Explanation of symbols]

 1 Batch Type Firing Furnace 3 Firing Chamber 3a Side Wall 4 Hearth 5 Electric Heater 6 Gas-Fired Burner 7 Exhaust Passage S S

Claims (1)

[Claims] 1. A firing chamber (3) for storing an article to be fired (S).
An electric heater (5) spaced apart along the height direction is installed inside the furnace, and the side wall (3) of the firing chamber (3) is installed.
While installing a gas-fired burner (6) on top of a),
A batch type firing furnace characterized in that an exhaust passage (7) is provided inside a hearth (4) that closes the lower opening of the firing chamber (3).