JPH0594693U - Electric furnace kiln with pre-combustion chamber - Google Patents

Abstract

(57) [Summary] [Purpose] To provide an electric furnace kiln that can make the reducing gas sent into the electric furnace kiln a uniform concentration and can fire high-quality ceramics. [Composition] A pre-combustion chamber 3 which communicates with the inside of the combustion chamber 2 of the burner 1 to circulate the combustion gas is provided, and an air supply hole 5 is provided on the chamber wall of the pre-combustion chamber 3 to circulate combustion in the pre-combustion chamber 3. The gas is sent into the combustion chamber 2 through the gas supply hole 5.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an electric kiln for firing ceramic products.

[0002]

[Prior Art]

 A conventional electric furnace kiln has heater wires installed on the furnace wall and a shelf for lining ceramic products inside. In recent years, reducing gas such as carbon monoxide gas generated by a burner is sent into an electric furnace to be fired in a reducing atmosphere. Since the pre-combustion chamber that generates the reducing gas and sends it to the electric furnace kiln has the structure shown in Fig. 4, the concentration of the reducing gas is easily influenced by the surrounding environment, and it is difficult to make the concentration uniform and introduce it into the furnace kiln while it is non-uniform. Be entered. Also, due to the difference in the resistance of the roadside E, it is difficult to make the ejection speed from the introduction port F uniform. Therefore, there was a problem that the reducing gas concentration in the kiln was fired in a non-uniform state, a product of the same quality could not be produced, and reproducibility was poor.

[0003]

[Problems to be solved by the device]

 The problem to be solved by the present invention is to solve these conventional problems and to provide an electric furnace kiln with a pre-combustion chamber that enables the reducing gas in the electric furnace to have a uniform concentration.

[0004]

[Means for Solving the Problems]

 The gist of the present invention which has solved the above problems is as follows: 1) A pre-combustion chamber is provided which communicates with the combustion chamber of the burner and circulates the combustion gas, and the combustion gas is sent to the main wall of the pre-combustion chamber. Electric furnace kiln with pre-combustion chamber characterized by having pores 2) A box body is provided at the bottom of the electric furnace kiln body, two partition walls are provided in the box body, and a space between the two partition walls is provided. The chamber is the combustion chamber of the burner, and the chambers on both sides of it are the pre-combustion chambers, and both ends of the partition wall are separated from the inner wall of the box to provide a communication port. It is located in an electric furnace kiln with a pre-combustion chamber that has vent holes communicating with it.

[0005]

[Action]

 In the present invention, the combustion flame from the burner is in the combustion chamber, and the combustion gas of the reducing gas generated such as carbon monoxide CO gas flows into the pre-combustion chambers on both sides, passes through the pre-combustion chambers, and then enters the combustion chamber again. Return. During this circulation, the reducing gas concentration in the pre-combustion chamber becomes uniform, and when it becomes uniform, it is sent to the electric furnace kiln through the air holes in the chamber wall, and the reducing gas atmosphere in the electric furnace kiln becomes uniform. Is to

[0006]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. 1 is a perspective view of the present embodiment, FIG. 2 is a perspective view showing the inside of a box, FIG. 3 is a vertical sectional view showing a pre-combustion chamber, and FIG. 4 is a sectional view showing a conventional combustion chamber.

In the figure, 1 is a burner, 2 is a combustion chamber, 3 is a pre-combustion chamber, 4 is an electric furnace kiln body, 5 is an air vent, 6 is a box, 7 is a partition wall, 8 is a communication port, and 9 is Ceiling part of the pre-combustion chamber, 10 is a heater mounted on the inner wall surface of the electric furnace kiln body 4, 11 is a shelf, 12 is a ceramic product, 13 is a gas exhaust hole, 14 is a CO gas concentration detector, and 15 is gas sampling. A gas extraction pipe, a combustion control device 16 for the burner 1, a LP gas supply pipe 17 for the burner 1, and an air supply pipe 18 for the burner 1.

In this embodiment, the burner 1 inhales the LP gas and burns the air, and the flame is generated in the combustion chamber 2 of the box body 6. The partition wall 7 prevents the flame and its combustion gas from directly entering the pre-combustion chamber 3. The combustion gas generated in the combustion chamber 2 flows into the pre-combustion chambers 3 on both sides from the communication port 8 at the back of the partition wall 7, and the combustion gas diffuses in the pre-combustion chamber 3 to become a uniform state. Is returned to the combustion chamber 2 from the communication port 8 on the burner side, flows into the pre-combustion chamber 3 again with new combustion gas, and is circulated. By circulating, the concentration and distribution of the reducing gas in the pre-combustion chamber 3 can be made stable and uniform, and then sent to the inside of the electric furnace kiln body 4 through the air supply holes 5 to create a stable reducing gas atmosphere of uniform concentration. The ceramic product 12 is fired.

Further, in this embodiment, the gas in the electric furnace kiln body 4 is extracted by the gas extraction pipe 15, the concentration of the reducing gas is detected by the CO gas concentration detector 14, and the concentration signal thereof is used as the combustion control device. The output of the burner 1 is controlled according to the difference between the detected density and the set value of the density so that the set density can be obtained.

[0010]

[Effect of the device]

 As described above, according to the present invention, in addition to the combustion chamber, a pre-combustion chamber that forms a circulation path with the combustion chamber is provided, and after the combustion gas is stabilized to a uniform concentration, the combustion gas is fed into the electric furnace kiln. Therefore, there is an effect that the reducing gas in the kiln can be made stable and uniform.

[Brief description of drawings]

FIG. 1 is a perspective view of an embodiment of the present invention.

FIG. 2 is a perspective view showing the inside of the box.

FIG. 3 is a vertical sectional view showing a pre-combustion chamber.

FIG. 4 is a sectional view showing a conventional combustion chamber.

[Explanation of Codes] 1 Burner 2 Combustion chamber 3 Pre-combustion chamber 4 Electric furnace kiln body 5 Air vent 6 Box 7 Partition wall 8 Communication port 9 Ceiling 10 Heater 11 Shelf 12 Ceramic product 13 Gas exhaust hole 14 CO gas concentration detection 15 Gas extraction pipe 16 Combustion control device

Claims (2)

[Scope of utility model registration request] 1. A pre-combustion chamber that communicates with a combustion chamber of a burner to circulate the combustion gas is provided, and an air supply hole for transmitting the combustion gas to the main body of the electric furnace is provided on a chamber wall of the pre-combustion chamber. Electric furnace kiln with a pre-combustion chamber. 2. A box body is provided in a lower portion of an electric furnace kiln body, two partition walls are provided in the box body, a chamber between the two partition walls is used as a combustion chamber of a burner, and chambers on both sides thereof are preliminarily provided. The combustion chamber,
An electric furnace kiln with a pre-combustion chamber in which both ends of the partition wall are separated from the inner wall of the box, a communication port is provided, and an air supply hole communicating with the inside of the main body of the electric furnace is provided in the ceiling of the pre-combustion chamber.