JPH063055A - Baking apparatus - Google Patents

Abstract

PURPOSE:To achieve a lowering of running cost by a method wherein an exhaust gas combustion furnace is arranged at an upper part of a pre-heating furnace as laminated in a baking apparatus with the preheating furnace, a baking furnace and the exhaust gas combustion furnace to enable effective utilization of exhaust gas combustion energy and residual heat for the pre-heating furnace. CONSTITUTION:A matter to be baked such as ceramics molded product is placed on a mesh belt 1 to be carried into a baking furnace. In the baking furnace, firstly, a binder contained in the matter to be baked is pre-heated with a pre-heating furnace 6 to transpire it. The pre-heating furnace 6 is made up of a reaction pipe 7, a heater 8 arranged at the position of a bottom part thereof and a heat preserving material 9 and dry air is supplied into the reaction pipe 7 from an air supply pipe 11. Thereafter, the matter to be baked is baked at about 900 deg. with the baking furnace 12 of a structure almost the same as that of the pre-heating furnace 6 and carried out as product. Exhaust gas discharged from the furnaces 6 and 12 is collected with an exhaust pipe 15 and undergoes a combust processing with the exhaust gas combustion furnace 16 arranged at the upper part of the pre-heating furnace 6 to give combustion heat thereof to the pre-heating furnace 6.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a firing apparatus used for producing ceramic products.

[0002]

BACKGROUND OF THE INVENTION Conventionally, in the manufacture of ceramic products, as a first step, preheating is performed in a preheating / desoot furnace in order to heat and evaporate the binder contained in the material to be fired,
Next, as a second step, the object to be fired is fired at a high temperature in a firing furnace. Exhaust gas containing a binder that evaporates when a ceramic molded product is heated contains a large amount of various harmful substances and cannot be released into the atmosphere without purification treatment. For this reason, the exhaust gas generated in the treatment process is guided to the purification device (pyrolysis device), and is subjected to the purification treatment before being discharged into the atmosphere.

Therefore, when installing the firing apparatus,
In addition to the space for installing the firing furnace, it is necessary to install space for a purification device that treats exhaust gas. In recent years, however, the land shortage has become particularly serious, and in addition, large devices increase the construction cost of the factory itself. Therefore, it has been desired to make the device compact.

[0004]

DISCLOSURE OF THE INVENTION An object of the present invention is to provide a compacting apparatus which is low in running cost. The object of the present invention is a preheating furnace for preheating a material to be fired, a firing furnace for firing the material to be fired, and an exhaust gas for burning exhaust gas discharged from the material to be fired processed in the preheating furnace and the firing furnace. A combustion apparatus comprising a combustion furnace, wherein the exhaust gas combustion furnace is laminated on the preheating furnace.

That is, since the exhaust gas combustion furnace is arranged above the preheating furnace, it is not necessary to secure a large space for specially installing this exhaust gas combustion furnace, and it is possible to achieve extremely space saving. Furthermore, the exhaust gas combustion furnace is stacked on top of the preheating furnace so that the combustion heat energy of the exhaust gas generated in the exhaust gas combustion furnace and the residual heat of the exhaust gas combustion furnace are supplied to the preheating furnace. Therefore, the combustion heat energy and residual heat of the exhaust gas of the exhaust gas combustion furnace can be used for the preheating furnace, the thermal efficiency becomes extremely good, and the running cost becomes low.

The heater provided in the exhaust gas combustion furnace is preferably a heater composed of a heating wire spirally wound and a magnetic tube covering the periphery of the heating wire,
When the heater is configured in this way, corrosion of the heating wire due to the exhaust gas does not easily occur and durability is high.

[0007]

1 and 2 show one embodiment of a firing apparatus according to the present invention, FIG. 1 is a sectional view of the firing apparatus, and FIG. 2 is a firing line taken along line XX of FIG. It is sectional drawing of an apparatus. In the drawings, reference numeral 1 denotes a mesh belt that conveys a body to be fired (ceramic molded product before firing), and the mesh belt 1 is configured to be driven clockwise by a drive unit 2.

Reference numeral 3 is a loading workbench, 4 is a loading workbench, and the workbench 3 and 4 are provided with rollers 3a and 4a on which the mesh belt 1 is stretched, that is, the object to be fired is It is configured such that it is carried into the firing furnace from the carry-in work table 3, is subjected to a firing process in the firing furnace, and is carried out to the carry-out work table 4. Since the firing device is installed via the adjuster 5, the worktables 3 and 4 can be held at appropriate heights.

Numeral 6 is a preheating soot-removing furnace for preheating the body to be fired to about 450 ° C. in order to evaporate the binder contained in the body to be fired. The preheating and soot-removing furnace 6 prevents the heat of the heater 8 from being dissipated by the reaction tube 7 in which the binder is evaporated from the object to be fired, the heater 8 disposed at the bottom of the reaction tube 7. It is composed of a heat insulating material 9.
The heater 8 is a magnetic tube in which a nichrome wire or the like is tightly wound in a spiral shape, and when the heater is replaced, it can be easily inserted and removed in the direction of the arrow in FIG.

10a and 10b are air supply ports, and 11 is an air supply pipe. Dry air is supplied from the air supply ports 10a and 10b to the air supply pipe 11, and further the air supply pipe 11 is provided.
The dry air is supplied into the reaction tube 7 through the large number of the holes formed in (1), and the soot removal process is favorably promoted. Reference numeral 12 denotes a firing furnace which communicates with the preheating soot-removing furnace 6, which is composed of a reaction tube, a heater and a heat insulating material like the preheating soot-removing furnace 6, and is subjected to the soot removal treatment in the preheating soot-removing furnace 6. The body is carried into the firing furnace 12 and fired at a temperature of about 900 ° C. to obtain a ceramic product.

Reference numeral 13 is a cooling tube communicating with the firing furnace 12, and the high temperature ceramic product fired through the previous stage is cooled in the cooling tube 13. Reference numeral 14 denotes an air curtain generator provided near the loading and unloading sides of the baking apparatus.
Is configured so that compressed air is ejected from the nozzles that are arranged facing each other. That is, the formation of the air curtain makes it difficult for the outside air containing moisture, oil, suspended dust, etc. to enter the inside of the firing apparatus, the article to be fired is favorably fired, and untreated exhaust gas is generated. It will not leak easily and the working environment will not deteriorate.

Reference numeral 15 denotes an exhaust pipe for collecting the binder vapor discharged from the preheating soot-removing furnace 6 and the main firing furnace 12. 1
As shown in FIG. 1, reference numeral 6 is an exhaust gas combustion furnace arranged above the preheating and soot removing furnace 6. The exhaust gas combustion furnace 16 includes an exhaust nozzle 17 for efficiently guiding the exhaust gas absorbed by the exhaust pipe 15 to the exhaust gas combustion furnace 16, and a heating pipe 1.
8 and a heater 19 and the like, the exhaust gas is heated to a temperature of about 800 ° C. in the exhaust gas combustion furnace 16 and burned and thermally decomposed.

High-speed air is supplied to the exhaust nozzle 17, and the exhaust gas is efficiently guided to the exhaust gas combustion furnace 16 by the Venturi effect. The heater 19 is different from the heater used in the firing furnace 12 and the preheating soot-removing furnace 6 and is composed of a heating wire spirally wound and a magnetic tube covering the periphery of the heating wire. The heating wire is configured not to be corroded by various substances contained in the exhaust gas when the exhaust gas passes through.

Reference numeral 20 is a cooling pipe for cooling the exhaust gas that has been burned and decomposed by heat in the exhaust gas combustion furnace 16 before being discharged into the atmosphere. The wall of the cooling pipe 20 has a honeycomb structure, and the heat of the exhaust gas is reduced. Is configured to efficiently dissipate heat to the outside. In the firing apparatus configured as described above, the material to be fired is vaporized with the binder in the preheating soot-removing furnace 6 and fired in the firing furnace 12 to produce a ceramic product, and is discharged in the preheating and firing steps of the ceramics. The exhaust gas is thermally decomposed and burned in the exhaust gas combustion furnace 16, so that harmful substances contained in the exhaust gas become harmless.

The exhaust gas combustion furnace 16 is a preheating and soot removal furnace 6
Since it was placed above, when installing the firing device,
It is not necessary to separately secure a special space for arranging the exhaust gas treatment device, so that the space can be extremely saved. Further, since the exhaust gas combustion furnace 16 is laminated and arranged above the preheating soot furnace 6, the heat generated from the heater 19 is appropriately conducted to the upper portion of the preheating soot furnace 6 and Since it is heated by the combustion heat of the exhaust gas and the residual heat of the exhaust gas combustion furnace 16, the thermal efficiency is high, and a heater is provided around (upper and lower) the preheating desorption soot furnace as in the case where the preheating desorption soot furnace and the exhaust gas combustion furnace are separately arranged. There is no need to place them, and running costs are low.

[0016]

[Effect] The firing apparatus of the present invention is compact and has a low running cost.

[Brief description of drawings]

FIG. 1 is a sectional view of a firing apparatus.

FIG. 2 is a cross-sectional view taken along line XX of the firing apparatus.

[Explanation of symbols]

 6 Preheating Soot Furnace 7 Reaction Tube 8 Heater 9 Heat Insulating Material 12 Main Firing Furnace 16 Exhaust Gas Combustion Furnace 17 Exhaust Nozzle 18 Heating Pipe 19 Heater

Claims (2)

[Claims] 1. A preheating furnace for preheating a material to be fired, a firing furnace for firing the material to be fired, and an exhaust gas combustion furnace for burning exhaust gas discharged from the material to be fired treated in the preheating furnace and the firing furnace. A calcination apparatus comprising: the flue gas combustion furnace laminated on the preheating furnace. 2. The heater provided in the exhaust gas combustion furnace is composed of a heating wire spirally wound and a magnetic tube covering the periphery of the heating wire. Baking equipment.