JPS5940184B2 - Combustible waste processing furnace - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a combustible waste processing furnace for thermally decomposing organic matter such as combustible waste and recovering gas, oil, and the like.

Conventionally, when treating combustible wastes, fixed bed (moving bed) thermal decomposition furnaces are often used to thermally decompose organic matter.

A serious problem when using such a pyrolysis furnace to pyrolyze organic matter is how to prevent the channeling of waste in the furnace and the occurrence of bridging phenomena, and the extent to which this occurs depends on the pyrolysis efficiency. It has a great influence on the quality, sustainability and stability of the product.

The problem of channeling is particularly important when a vertical furnace is used to thermally decompose materials whose composition varies significantly, such as municipal waste.

The present invention has been made in view of the above points, and embodiments thereof will be described below based on the drawings.

In FIG. 1, 1a is a combustible waste inlet formed at the top of the furnace.

The combustible waste thrown into the furnace is appropriately burned in the lower part of the furnace.

Combustion gas generated by combustion of combustible waste rises in the furnace and is discharged to the outside from the exhaust gas vent 1b at the top of the furnace.

In such a furnace, thermal decomposition of organic matter is caused by the sensible heat of the combustion gas.

Therefore, a pyrolysis zone B is formed in the upper layer of the combustion zone A in the furnace, and a drying zone C is further formed in the upper layer of the pyrolysis zone B.

In the pyrolysis zone B, gaseous or oily substances are produced, while in the combustion zone A, residual substances containing some carbon substances are produced.

The residual material is discharged to the outside through the lower layer of combustion zone A.

Although the boundaries between the drying zone C and the pyrolysis zone B, the pyrolysis zone B and the combustion zone A, etc. do not appear clearly, their approximate positions are fixed.

Therefore, in this embodiment, by tapering the furnace wall surfaces 2A and 2B of the combustion zone A and the pyrolysis zone B, the part of the combustion zone A that continues to the boundary 3 between the two is shaped like a lower part, and the pyrolysis zone B The upper part is tapered.

In this way, the surface pressure between the material to be treated and the furnace wall can be maintained above a certain level in the pyrolysis zone B, thereby preventing the occurrence of channeling, and ensuring a combustion space in the combustion zone A. Therefore, effective combustion can be carried out.

Note that the drying area C and the wall surface 2C above it are vertical.

FIG. 2 shows a modification.

In this embodiment, the wall surface 2C of the drying zone C, the wall surface 2B of the pyrolysis zone B, the wall surface 2A of the combustion zone A, and the wall surface 2D of the lower layer are each made to have the same taper. The upper part of the boundary part 3 with the upper part is in the form of an upper bulge, and the lower part is in the form of a lower part.

The above effect can also be obtained in this manner.

FIGS. 3 and 4 show experimental results for confirming the effects of the present invention.

This experiment was conducted by installing four thermometers T1 to T4 at equal angles on the circumferential wall of the portion corresponding to the entrance of the drying area, and the existence and degree of channeling was determined from the detected temperature difference between them. Can be confirmed.

That is, FIG. 3 shows a furnace in which the walls of the combustion zone and the pyrolysis zone do not have any taper.

In this furnace, it was found that channeling occurred at the location where the thermometer T4 was installed.

On the other hand, FIG. 4 shows the furnace according to the present invention, and from this figure it can be seen that channeling is prevented from occurring at any location where the thermometers T1 to T4 are installed.

As is clear from the above description, although the present invention has a very simple configuration, it is possible to effectively prevent channeling from occurring.

As a result, the amount of waste to be treated increases, and in addition, the amount of combustible gas produced by thermal decomposition increases, and the composition of the produced gas is improved.

In all of the embodiments above, a taper is formed over the entire height of the wall surface of the pyrolysis zone, but the effect of the present invention is to have a taper in a part of the wall surface, that is, at least the combustion zone and the pyrolysis zone. This can be achieved by making the upper part of the boundary of the area into an upper ridge shape and the lower part of the boundary into a lower ridge shape.

In the present invention, it is desirable that the degree of taper of the upper curved portion of the inner wall surface of the furnace is determined within a range in which the object to be treated does not cause a bridging phenomenon.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention, with FIG. 1 being a longitudinal side view, FIG. 2 being a longitudinal side view of a modified example, and FIG.
FIG. 4 is a graph of the experimental results. A: combustion zone, B: thermal decomposition zone.

Claims (1)

[Claims] 1. A combustible waste processing furnace in which thermal decomposition is carried out in the upper part of the combustion zone, characterized in that at least the upper boundary between the combustion zone and the thermal decomposition zone is shaped like an upper bevel, and the lower part of the boundary is shaped like a lower bevel. A processing furnace for combustible waste.