JPH0415485A - Continuous incineration furnace - Google Patents

Abstract

PURPOSE:To get a uniform incinerator temperature and make a stable product quality by a method wherein a combustion gas injection port is formed at a furnace bed, a gas burner for injecting hot combustion gas having excessive air is disposed at a lower part of the furnace bed and an electrical heater and a discharging chimney passage for the incinerator product gas are provided in a ceiling part. CONSTITUTION:A furnace bed 12a of a furnace body 12 has a combustion gas injection port 15. A gas burner 16 for injecting hot combustion gas containing surplus air into the furnace through an injection port 15 is disposed at a lower part of the furnace bed 12a. A heater 17 and a chimney passage 18 for discharging the product generated from the ignited substance out of the furnace are disposed at a ceiling part 12b. Combustion gas containing excessive amount of air from the gas burner 16 rapidly removes reaction gas from the ignited substance, a sufficient amount of oxygen required for ignition of the ignited substance is supplied and a uniform and sufficient amount of air required for performing a uniform combustion can be supplied and a temperature within the furnace can be made uniform. With such an arrangement, it is possible to get a superior product having a stable quality.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a continuous firing furnace used for manufacturing ceramic electronic products such as ceramic dielectrics of ceramic capacitors, ceramics of piezoelectric resonators, and piezoelectric substrates.

(Prior Art) In general, firing furnaces used to manufacture ceramic dielectrics for ceramic capacitors, ceramic piezoelectric substrates for piezoelectric resonators, etc. are either continuous firing furnaces that continuously fire the objects to be fired, or batch processing of the materials to be fired. There is a notch furnace.

An example of a conventional continuous firing furnace is shown in FIG.

The continuous firing furnace 1 has a tunnel-shaped furnace body 3 placed horizontally on a base 2. The boxes 5, which contain objects to be fired (not shown) and are stacked in multiple stages on the base plate 4, pass through the inside of the furnace body 3 from the entrance 6 of the furnace body 3, and pass through the inside of the furnace body 3.
As shown by the arrow A1, it is first automatically pushed into the preheating zone following the inlet 6 of the furnace body 3 by the pusher 8 toward the exit lower part of the furnace body 3.

After burning the binder in the object to be fired in this preheating zone by the heater 9 disposed in the furnace body 3, the base plate 4
The material to be fired is fired by the heater 9.

When this firing is completed, the object to be fired is cooled by being cooled by a cooling zone following the firing zone of the furnace body 3.
It is pulled out from the furnace body 3.

(Problem to be solved by the invention) By the way, in the conventional continuous firing furnace 1 as described above, large or irregularly shaped objects containing a large amount of binder are burned during the combustion of the sinter in the preheating zone. Carbon dioxide, moisture, etc. generated by chemical reactions during firing of the object to be fired in the firing zone often create areas unsuitable for firing, resulting in non-uniform sintered bodies.

In this way, in order to prevent the formation of areas unsuitable for firing the object to be fired, cold air with a low temperature is introduced directly into the furnace body 3.

However, in this case, the air sent into the furnace body 3 causes a drift within the furnace body 3, making it impossible to uniformly heat the object to be fired, and the ceramic combustion gas is injected into the combustion scum. A gas burner ejects into the furnace body from the outlet, an electric heater placed under the ceiling of the furnace body at a distance between the inlet and the outlet, and a gas burner that is generated inside the furnace body when firing the object to be fired. It is characterized by being equipped with a flue for discharging materials out of the furnace body.

(Function) The above-mentioned gas burner spouts high-temperature combustion scum containing excess air into the furnace body from each combustion scum spouting port of the hearth. This high-temperature combustion residue containing excess air accelerates the removal of binders from the objects to be fired and quickly removes reactive gases that adversely affect uniform firing, as well as supplying the oxygen necessary for firing the objects to be fired. .

Further, the electric heater heats the object to be fired from above the furnace body.

(Effects of the Invention) According to the present invention, the high-temperature combustion gas containing excess air that is ejected into the furnace body from each combustion scum spouting port of the hearth adversely affects the promotion of binder removal and uniform firing of the object to be fired. There was a problem in that reaction debris and the like were quickly removed, increasing temperature variations in product characteristics.

In addition, in the conventional continuous firing furnace 1, it is necessary to heat the base plate 4, which has a large heat capacity, on which the objects to be fired are placed and conveyed, and it is also necessary to heat the base plate 4, etc., which has a large heat capacity, and also to continuously heat the base plate 4, which has a large heat capacity. There is also a problem in that the labor and labor costs for operating the firing furnace 1 also increase.

The purpose of the present invention is to obtain a sintered body with stable quality by reducing the variation in tU degree within the furnace body and supplying sufficient oxygen to the deinterfacing and firing areas that require sufficient air. The object of the present invention is to provide a continuous firing furnace that can perform

(Means for Solving the Problems) In order to achieve the above object, the present invention provides that the object to be fired is continuously fired in the process of being conveyed from the entrance to the exit of a tunnel-shaped furnace body. In a continuous firing furnace, the furnace body is arranged in the lower part of the hearth with the combustion nozzle spouts spaced apart between the hearth and the Oxygen necessary for firing the high-temperature firing target containing air is supplied, and the firing of the firing target is performed using both dust and electricity, so it is possible to provide uniform and sufficient air necessary for uniform firing. Not only can you do it, but
The temperature inside the furnace is also made uniform, making it possible to obtain products of good quality. By using waste and electricity in combination, the time for firing the objects to be fired is shortened, resulting in a continuous firing furnace that saves labor and requires no energy. be able to.

(Example) Below, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 shows a longitudinal cross-section of an embodiment of a continuous firing furnace according to the present invention, and FIG. 2 shows a cross-section taken along line 1--2.

The continuous firing furnace 11 has a tunnel-shaped furnace body 12. Then, in the process of conveying the object to be fired from the inlet 13h1 of the furnace body 12 toward the outlet 14, the object to be fired is continuously fired.

The hearth 12a of the furnace body 12, which is shaped like a cylinder, serves as a combustion scum spouting port 15. These combustion nonosuction ports 15 are
A gap is formed between an inlet 13 and an eye 14 in the hearth 12a of the furnace body 12.

A gas burner 16 is disposed below the hearth 12a to eject high-temperature combustion scum containing excess air into the furnace body 12 from each combustion gas outlet 15.

On the other hand, a heater 17 made of silicon carbide, for example, is disposed within the furnace body 12 . These heaters 17 are connected to the furnace body 1
It is placed under the ceiling +2b of the furnace body 12 with an interval between the inlet 13 and the outlet 114 of the furnace body 12.

The furnace body 12 also includes a flue 18 in the ceiling portion 121) for discharging products generated during firing of the object to be fired inside the furnace body 12 to the outside of the furnace body 12.

With such a configuration, the gas burner 16 is connected to the hearth 12.
High-temperature combustion scum containing excess air is ejected into the furnace body 12 from each combustion scum spouting port 15 of a, and the fired scum is conveyed along with the heater 17 on the bottom plate 19a or the base plate 19 on which it is placed. to heat something (not shown).

15 Combustion gas outlet, 16... Casvarna.

17 Heater, 1B flue.

Claims (1)

[Claims] (1) In a continuous firing furnace in which the material to be fired is continuously fired while being transported from the entrance to the exit of a tunnel-shaped furnace body, the furnace body has the above-mentioned inlet and outlet on its hearth. a gas burner disposed at a lower part of the hearth and spewing high-temperature combustion gas containing excess air into the furnace body from each of the combustion gas outlets; An electric heater placed under the ceiling of the furnace body at a distance between the inlet and the outlet, and a smoke for discharging products generated inside the furnace body when firing the object to be fired to the outside of the furnace body. A continuous firing furnace characterized by being equipped with a road.