JPS589198Y2 - Ibushikawarashiyouseigama - Google Patents

Description

[Detailed explanation of the invention] The present invention relates to a kiln for firing oxidized roof tiles, and in particular, in order to adsorb oxidized gas to the roof tiles and carburize them, a large number of kilns are installed on the peripheral wall of the furnace shell so as to look into the internal firing chamber. The feature is that the oxidizing gas blowing pipe installed is made of corrosion-resistant and heat-resistant ceramic.

As is well known, ibushi tiles are fired in a firing chamber at around 1100°C, then closed to prevent outside air from entering the firing chamber, and then when the atmosphere is around 950 to 800°C. The firing chamber is filled with smoke generated by smoking wood or, more recently, with liquefied petroleum gas.

The carbon in the filled gas is then adsorbed onto the tiles, resulting in carburization and coloring.

Next, after this carburizing coloring has been sufficiently carried out, the supply of smoke or liquefied petroleum gas is stopped, the inside of the firing chamber is cooled to below 300°C, and then the kiln is opened for the first time to allow outside air to flow into the firing chamber. This process involves taking out the silver-fired ibushi tiles from the firing chamber.

The reason why the kiln is opened after cooling to below 300° C. is that when outside air flows into the high-temperature atmosphere of the firing chamber, the carbon that has been carburized and colored in the roof tile will ignite and burn out.

During the firing process, the means for supplying oxidizing gas such as liquefied petroleum gas into the firing chamber is to arrange a large number of oxidizing gas blowing pipes on the peripheral wall of the furnace shell, and to expose the tip nozzles of the pipes into the firing chamber. This is done by letting people know.

However, the temperature inside the firing chamber reached a maximum of around 1100℃,
It is also exposed to high temperatures for quite a long time.

In addition, during firing, a large amount of water vapor evaporated from the raw tiles fills the firing chamber.

For this reason, with conventionally used iron or cast iron gas blowing pipes, the tip nozzle is exposed to high temperatures in the firing chamber for a long period of time, but also comes into contact with water vapor, which combine to reduce the temperature within a short period of time. It had the disadvantage that it corroded and had to be replaced quickly.

In addition, the nozzle portion is clogged with slag due to this corrosion, and the blowing tube must be frequently removed from the furnace wall to clean the nozzle portion, which is extremely troublesome.

For this reason, on the one hand, the tip nozzle of the blowing pipe is retracted into the furnace shell so that it looks into the firing chamber, but this is still not sufficient to eliminate the above-mentioned drawbacks, and it is actually used more Since the gas cannot be sufficiently injected into the firing chamber from the tip nozzle at a wide angle, the oxidizing gas, which is supposed to uniformly fill the firing chamber, becomes uneven, which causes uneven oxidation of the roof tiles, causing new problems. There are drawbacks.

Furthermore, when the sifting gas ejected from the tip nozzle collides with the furnace shell, it becomes carbon and accumulates, further exacerbating this drawback.

Even if the blowing pipe was replaced with a stainless steel material having rust resistance, such conventional drawbacks could not be overcome due to the synergistic effect of high temperature and water vapor.

In view of these points, the present invention has been developed by making the oxidizing gas blowing pipe made of ceramic with excellent corrosion and heat resistance, so that the tip nozzle part will not be corroded at all, and will be able to withstand long-term use. At the same time, it prevents slugs caused by corrosion from clogging the nozzle.
A firing kiln that allows the tip nozzle to protrude from the inner surface of the furnace shell and look into the firing chamber, thereby uniformly filling the firing chamber with oxidizing gas and firing ibushi tiles with even oxidation. The purpose is to obtain the following.

An embodiment of the present invention will be described below based on the drawings.

FIG. 1 shows a longitudinal sectional front view of the firing kiln of the present invention, which includes a furnace shell 2 lined with ceramic wool 1 as a heat insulating material.
It is suspended from the outer periphery of the bottom wall 3 via a chain block 4, so that it can be hung freely.

The lower part of the furnace shell 2 is bent inward in steps, and flame blowing tubes 6 are vertically welded to the stepped horizontal plate portion 5 at appropriate intervals. The gas burner 7 is placed in the cylinder 6 from below.

Inside this furnace shell 2, the peripheral space located above the horizontal plate portion 5 becomes a flame blowing chamber 8, and the central space inside this becomes a firing chamber 9.

A supporting wall 11 constructed with a large number of ventilation holes 10 is erected on the upper surface of the left and right sides of the bottom wall 3, and the roof tile 12 is placed on a supporting frame 13 with a frame between these supporting walls 11°11. They are placed in parallel and fired.

The heated exhaust gas in the firing chamber 9 is discharged through a number of exhaust holes 14 scattered in the bottom wall 3, and a flue gas duct 15 provided at the lower part of the bottom wall 3.
and the firing chamber 9 are communicated through the exhaust hole 14, and the flue flue 2
This is done by discharging from 6 to a chimney not shown.

Therefore, in the firing kiln having such a structure, the present invention makes it possible to replace the oxidizing gas blowing pipes 15, which are arranged in large numbers on the upper half of the peripheral wall and the ceiling wall of the furnace shell 2, with ceramics, as shown in FIG. In addition, the tip nozzle portion 16 is made to protrude from the inner surface of the furnace shell 2 and look into the flame blowing chamber 8 and the firing chamber 9.

That is, a socket 17 is removably attached to and fixed on the outer surface of the furnace shell 2, and a thread formed at the base end of the blowing pipe 15 is screwed into the inner thread of the socket 17. It is installed by passing through the furnace shell 2 with the tip nozzle portion 16 protruding into the firing chamber 9.

Since the socket 17 and the blowing tube 15 have different expansion coefficients, the blowing tube 15 needs to be loosely screwed into the socket 17.

A bushing 18 is further screwed into the socket 17 from the outside, and a flare nut 20 of the conduit 19 and the bushing 18 are connected via a nipple 21.

This conduit 19 is provided with an on-off valve 22 and connected to a branch pipe 23, and the main oxidizing gas supply pipe 24 is connected to the branch pipe 23 via another on-off valve 25.

Next, its effect will be explained.

First, raw tiles 12 are stacked on the support frame 13 in the firing chamber 9.
is heated and dried by the combustion flame of each burner 7 until it reaches a temperature of 1100°C.

That is, the combustion flame blows up in the flame blowing chamber 8, flows down into the firing chamber 9 from the upper space, flows through the bottom wall 3 to the flue 15, and heats the tiles 12 in this process.

Next, each burner 7 is stopped, and while the temperature atmosphere in the firing chamber 9 is between 950°C and 800°C, the propane gas supplied from the oxidizing gas supply pipe 24 is transferred to each blowing pipe 15.
The propane gas is diffused and sprayed into the firing chamber 9 from the tip nozzle portion 16 of the propane gas to carburize and color the tiles 12 with carbon contained in the propane gas.

At this time, the combustible gas that has not been adsorbed by the roof tile 12 is guided through the bottom wall 3 to the flue 15, where it is appropriately incinerated and released into the atmosphere.

Subsequently, the inside of the firing chamber 9 is cooled down to 300° C. or lower in a sealed state, and then the furnace shell 2 is suspended by the chain block 4 and the kiln is opened.Finally, the roof tile 12 is radiated and taken out.

In such a manufacturing process, according to the present invention, each blowing pipe 1
5 is made of ceramic with excellent corrosion and heat resistance, so its tip nozzle part 16 in particular protrudes into the firing chamber 9 and comes into direct contact with the water vapor evaporating from the tiles during firing, and is exposed to high temperatures for a long period of time. However, there is no corrosion, and slugs produced by corrosion do not clog the tip nozzle portion 16.

Therefore, unlike conventional ones made of iron or cast iron, there is no need to frequently replace or clean the nozzle part 16 of the blowing pipe 15.

Furthermore, since the blowing pipe 15 is arranged with its tip nozzle part 16 protruding from the inner surface of the furnace shell 2, when supplying the oxidizing gas into the firing chamber 9, each nozzle part 1
The oxidizing gas can be uniformly sprayed from 6, and the firing chamber 9 can be evenly filled with the oxidizing gas, which is effective for carburizing and coloring roof tiles by making use of high quality oxidizing gas.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 1 is a vertical sectional front view of an ibushi tile firing kiln, and FIG. 2 is a longitudinal sectional view taken out of the main part. 2... Furnace shell, 9... Firing chamber, 15...
...gas blowing pipe for oxidation, 16...15
nozzle part.

Claims (1)

[Scope of utility model registration request] The oxidizing gas blowing pipe 15 is made of ceramic, and a large number of these gas blowing pipes 15 are arranged on the peripheral wall of the furnace shell 2, and the tip nozzle part 16 of the gas blowing pipe 15 is made to protrude from the inner surface of the furnace shell 2. This ibushi tile firing kiln is characterized by a view into the firing chamber 9.