JPH0996491A - Fuming box for object to be burnt - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent lowering of heat insulation ability of a heat insulation material and defective diffusion of a fuming agent by a method wherein fire resisting plates to prevent carbonization and adhesion of carbon generated by thermal decomposition of the fuming agent are laid on the surface of a layer of a heat insulation material. SOLUTION: A fuming box 20 has fire resisting plates 11 on the surface of a layer 10 of a heat insulation material in such a state that the edges of adjoining fire resisting stainless sheets are overlapped with each other, and a surface is processed in a smooth state. Thus, a large quantity of solid carbon generated through thermal decomposition of a fuming agent does not make contact with the heat insulation material, carbonization is not progressed in the internal direction of the layer of a heat insulation material, and formation of a rigid carbon film due to adhesion of solid carbon on the heat insulation material does not occur. This constitution prevents the occurrence of defectiveness of coloring glossiness due to defective diffusion of the fuming agent due to lowering of heat insulation ability of the heat insulation material, improves a yield of a product and production efficiency, and prevents the damage of a fuming box itself, whereby a prolonged life is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a smoked box of an object to be fired, which is mainly used for forming a carbon film on the surface of an object to be fired, such as fired roof tiles and tiles taken out from a firing zone. Is. More specifically, it has a layer of a heat insulating material formed on the inner surface of the main body of the smoked box, and stores a baked high-temperature object to be baked and filling the inside of the smoked agent while maintaining a sealed state. In the smoldering box used for catalytically decomposing the smoldering agent on the surface of the object to be fired to form a carbon film on the surface of the object to be fired, solid carbon produced by thermal decomposition of the smoldering agent To prevent (soot) from carburizing and adhering to the heat insulation layer formed on the inner surface of the smoked box body, a fireproof plate is laid on the surface of the heat insulation layer It's about smoked boxes.

[0002]

2. Description of the Related Art In the case of firing a tile or tile to be fired in a firing furnace and subsequently forming a carbon coating on the surface to give a smoked color, a large number of fired objects are to be placed on the carriage. One row or multiple rows are stacked in rows and fired through the firing zone, and the trolley is transferred to a predetermined position with the fired high-temperature object to be burned placed, and the upper surface of the trolley is made of ceramic fiber, etc. A box-shaped smoky box with an open bottom that covers a layer of heat-insulating material is used to block the entry of outside air, and carbon such as propane gas and butane gas is discharged from a nozzle that is installed through the ceiling or side wall. While injecting a large amount of fumigant, and then transporting the cart to the box removal position, the fumigant is catalytically decomposed on the surface of the object to be fired to form a carbon film on the surface of the object to be fired. And the material to be fired is removed It is adapted to remove the Ibushika box at the removal position of the where the temperature had fallen to that can be had.

Further, as the smoke-imparting box, there is also known one generally called a smoke-imparting zone in which a trolley carrying a baked object to be burned is put and smoked.

[0004]

However, in the above-mentioned conventional smoldering box, a large amount of solid carbon (soot) generated by the thermal decomposition of the smoldering agent carburizes in the layer of the heat insulating material. Along with this, a carbon coating is formed by adhering to the surface of the heat insulating material, and the carbon coating gradually grows (thickens) by repeated use of the smoldering box to form a hard solid carbon layer. There was a problem that good gloss and color development could not be obtained due to deterioration of performance and poor diffusion of a smoker.

Further, in the conventional smoldering box, carburization of solid carbon (soot) generated by thermal decomposition of the smoldering agent,
It is impossible to prevent the adhesion and the growth (thickening) of the adhered solid carbon, and when trying to remove the adhered solid carbon layer, there is no choice but to perform it carefully by hand so as not to damage the smoked box itself. Not only was the work efficiency extremely low, but it could not be peeled off and removed cleanly. Therefore, in many cases, such a smoked box requires a complete replacement of the heat insulating material, which is uneconomical.

As another method of disposing the fixed carbon adhered in the smoked box, a box combustion furnace having an upward burner is separately prepared, and the fixed carbon is burned by a high temperature flame ejected from the burner. There is a method to remove it, but these methods require a large amount of capital investment,
Moreover, it requires periodical fixed carbon removal work, and its management is extremely troublesome and troublesome.

The present invention has been made through intensive studies and invented in view of the above circumstances, and a problem to be solved is to solve the above-mentioned problems and problems of the conventional smoky box.

[0008]

[Means for Solving the Problems] The means taken by the present invention to solve the above-mentioned problems are as follows: "The heat-insulating layer has a layer of heat insulating material formed on the inner surface of the smoked box body. The object to be fired is contained and the inside of the object to be fired is filled with a fumigant, and the fumigant is catalytically decomposed on the surface of the object to be fired to form a carbon film on the surface of the object to be fired. In the smoked box used for that, a fireproof plate for preventing carburization and adhesion of carbon generated by thermal decomposition of the smoker is laid on the surface of the layer of the heat insulating material. The main point is the smoked box of the fired product.

[0009]

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

In FIG. 1, reference numeral 1 denotes a trolley which travels on a rail 4 by means of wheels 3, and a tile base 6 which is an object to be fired is erected on a mounting table 5 in a flat stacking state as a whole. It is placed and fired through the pre-tropical zone and firing zone of a tunnel furnace (not shown), and it passes through a predetermined smoldering zone, and the transfer position of finished products and unfired products in order, and then again inside the tunnel furnace. It is designed to circulate along the route of loading.

The reference numeral 20 indicates that the seal member 7 provided on the side wall of the carriage 1 is brought into contact with the lower end contact member 8 at the smoked position so that no gap is formed (the entry of outside air is blocked). It is a smoked box that covers the tile base material 6 of
S400, 4.5 mm) and a shell plate 9 and a heat-insulating ceramic layer 10 having a thickness of about 75 mm formed by laminating three layers of felt-shaped heat-resistant ceramic fibers on the inner surface thereof. , A plurality of fire-resistant stainless steel thin plates (SUS301S, thickness 0.8 mm) on the surface of the heat insulating layer 10
It is constructed by a shell wall composed of a fire-resistant plate 11 which is laid in such a manner that the edges thereof are overlapped with each other by about 20 mm, and the overall external shape is a box shape with an open lower surface.

In order to keep the smoky box in a state where the invasion of the outside air is blocked, as shown in FIG. 1, the lower end of the smoky box is brought into contact with a seal member attached to a carriage to form a gap. It is configured not to.

Further, the seal member attached to the lower end of the smoked box may be configured so as not to hit the upper surface of the carriage to form a gap.

Further, a fire-resistant stainless steel thin plate (SUS31
For the mounting of 0S), bolts are provided in each of a large number of through holes formed in the shell wall, and they are fixed by tightening nuts. That is, the heat insulating layer 8 is sandwiched between the shell plate 7 and the refractory plate, and bolts and nuts are tightened to fix them.

As the refractory plate, other refractory plates such as refractory ceramic thin plates can be used in addition to the refractory stainless thin plate, but in any case, the surface is smooth. It is desirable to be processed.

Further, a large number of nozzles 13 for filling the smoldering agent, which branch from the supply pipe 12, are arranged on the ceiling of the smoldering box 20 so as to penetrate through the shell wall, and each tip has a smoldering box 20. It has an opening inside.

A large number of nozzles 13 for filling the smoldering agent branched from the supply pipe 12 are arranged on the side wall of the smoldering box 20 through the shell wall, and the tips of the nozzles 13 are opened inside the smoldering box 20. You may do it.

Next, the method of using the smoked box 20 of this embodiment will be described. When the trolley 1 on which the baked high temperature tile base 6 is placed is transferred to the smoked box desorption chamber and stopped, it is not shown. The lifting device lowers the smoky box 20 that has been suspended, so that the top of the cart 1 is covered. At this time, the contact member 8 provided at the lower end of the smoked box 20 is the seal member 7 provided at the periphery of the carriage.
Since there is no gap when it hits the upper surface of
This makes it possible to completely block the invasion of outside air.

Needless to say, there are various known configurations other than the above as a configuration for completely blocking the invasion of the outside air, and any configuration may be used.

Next, the smoldering agent is injected into the smoldering box 20 from the nozzle 13 which is provided through the supply pipe 12 and through the ceiling (shell wall) of the smoldering box 20, and the thermally decomposed carbon is generated. While adhering to the tile base a, the surplus gas is discharged to the outside of the furnace through a chimney (not shown). Injection of smoker,
When the filling is completed, the chimney is closed, and the chimney is left in this state for a certain period of time (the transfer time required for returning the trolley 1 to the smoking box desorption chamber) to lower the roof tile substrate 6 inside to a temperature at which it can be handled. Then, the smoked box 20 is lifted (removed), and then transferred to the transfer position of the finished product and the unfired product.

That is, the carriage 1 is injected with the smoked gas,
During the transfer from the filling position to the desorption chamber desorption chamber, the smoldering agent is catalytically decomposed on the tile base 6 by the residual heat of the high-temperature fired object to form a carbon film. As a result, the surface of the roof tile base 6 is provided with good gloss and color.

In each of the above-mentioned embodiments, the structure of the smoky box covered by the upper surface of the trolley 1 is described as an example, but in the present invention, the front door is opened and closed to load the object to be fired. It can also be applied to smoked belts that are put in and out with the cart.

Next, the function of the smoked product box 20 of the fired product of this embodiment will be described.

First, in the smoked box 20 of this embodiment,
On the surface of the layer 10 of heat insulating material, the edges of the fire-resistant stainless steel thin plates (SUS310S) adjacent to each other are approximately 20 m apart from each other.
A fire-resistant plate 11 formed by laying a plurality of fire-resistant stainless thin plates is provided in a state of being superposed by m, and the surface of the fire-resistant plate 11 is processed to be smooth.

Therefore, a large amount of solid carbon (soot) generated by thermal decomposition of the fumigant does not touch the heat insulating material,
Further, since the carburizing does not occur inward of the heat insulating material layer, solid carbon (soot) does not adhere to the heat insulating material (ceramic fiber) to form a hard carbon coating.
Naturally, the carbon coating does not grow (thicken) due to the fact that the solid carbon further adheres onto the adhered solid carbon.

In the conventional smoldering box for the material to be fired, a large amount of solid carbon (soot) generated by the thermal decomposition of the smoldering agent comes into contact with the heat insulating material. ), The solid carbon (soot) adheres to the heat insulating material (ceramic fiber) to form a carbon film. Further, when it is repeatedly used, the solid carbon further adheres to the adhered solid carbon, so that the carbon coating sequentially grows (thickens), and a thick and hard solid carbon layer is formed inside the smoked box.

On the other hand, the smoked box 2 of this embodiment
First, as in the conventional smoke box, 0 is a good gloss because the solid carbon that has been carburized in the layer of the heat insulating material causes a decrease in the heat insulating ability, resulting in poor diffusion of the smolding agent. It is possible to improve the yield of products and the production efficiency, and it is possible to reduce the manufacturing cost because the color development and the color development are not lost.

Also, the smoked box 2 of the object to be fired of the present invention
According to 0, unlike the conventional smoldering box, carburization, adhesion of solid carbon (soot) generated by thermal decomposition of the smoldering agent,
Further, since the growth (thickening) of the adhered solid carbon can be prevented, there is no conventional work of removing the solid carbon layer, and the smoldering box itself is not damaged.

Further, even if the solid carbon layer is to be removed, since the refractory plate has a smooth surface and can be easily removed, the work efficiency is excellent. That is,
Since it is necessary to regularly remove the fixed carbon, the life of the smoked box can be extended and the facility investment cost can be reduced.

[0030]

As described above, the smoldering box of the object to be fired of the present invention is typified by a thin stainless plate or a ceramic thin plate on the surface of the heat insulating material layer formed on the inner surface of the main body of the smoldering box. Since the refractory plate is attached, the following remarkable operational effects which are not found in the conventional smoldering box for the object to be fired are exhibited.

(1) A large amount of solid carbon (soot) generated by the thermal decomposition of the fumigant is carburized in the layer of the heat insulating material and adheres to the surface of the heat insulating material to form a carbon film or carbon. Since the coating does not gradually grow (thicken) and form a hard solid carbon layer, the heat insulating capacity of the heat insulating material decreases,
Since good gloss and color cannot be obtained due to poor diffusion of the smoking agent, the yield of products and the production efficiency can be improved, and the manufacturing cost can be reduced. (2) Unlike the conventional smoldering box, the smoldering box of the object to be fired of the present invention is carburization of solid carbon (soot) generated by thermal decomposition of the smoldering agent, attachment, and growth of the attached solid carbon. Since there is no (thickening), the troublesome maintenance work of removing the solid carbon layer as in the conventional case is unnecessary. (3) Even when removing a slightly formed solid carbon layer, the surface of the fire-resistant plate can be easily removed because it is processed smoothly. It does not hurt the smoky box itself due to the forcible removal of the layers. (4) Further, unlike the conventional case, it is not necessary to separately prepare a box combustion furnace having a burner directed upward, so that expensive capital investment becomes unnecessary. That is, the life of the smoked box can be extended, and the facility investment cost can be reduced.

[Brief description of drawings]

FIG. 1 is a front sectional view showing a smoked box of an object to be fired according to an embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Bogie 3 ... Wheels 4 ... Rail 5 ... Mounting stand 6 ... Roof tile base 7 ... Sealing material 8 ... Abutting member 9 ... Shell plate 10 ... Insulating material layer 11 ... Fireproof plate 12 ... Supply pipe 13 ... Nozzle 20 ... Smoke Box

Claims (1)

[Claims] 1. A smoldering box main body having a layer of a heat insulating material formed on an inner surface thereof. In a smoldering box used for catalytically decomposing the smoldering agent on the surface of an object to be fired to form a carbon film on the surface of the object to be sintered, the surface of the layer of the heat insulating material is a smoker A smoked box for a product to be fired, comprising a fireproof plate laid to prevent carburization and adhesion of carbon generated by thermal decomposition of.