JPH0145525B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an incinerator, and more particularly to an incinerator suitable for treating industrial waste such as automobile tires and plastics, and waste such as sludge generated from water treatment facilities and municipal sewage.

As the amount of waste increases, an incinerator that simultaneously incinerates these wastes in a single incinerator is desired.

In response to such a request, for example, the material to be treated that is supplied to the peripheral portion of the rotary hearth is transferred to a discharge port in the center of the rotary hearth as the rotary hearth rotates by a guide plate provided above the hearth. A rotary hearth type incinerator has been proposed that incinerates waste while transporting it (US Pat. No. 3,605,656).

In this conventionally proposed rotary hearth type incineration, the materials to be processed are fed to the periphery of the rotary hearth and moved to the center of the rotary hearth as the hearth rotates using a plurality of guiding plates located above the rotary hearth. The waste is incinerated while being gradually transferred towards a provided discharge port.
It is in practical use as an incinerator that enables uniform incineration of materials to be processed.

However, in this type of rotary hearth type incinerator, the material to be processed on the hearth is transferred only by a fixed guide plate, and the material to be processed is not stirred or crushed during the incineration process. It lacks functionality, takes a long time to dry the processed material, and tends to generate clinker, leaving room for improvement.

As an incinerator that solves the above-mentioned difficulties of the rotary hearth type incinerator, a rotating shaft is provided above the rotary hearth and extends inward in the radial direction of the rotary hearth, and a spiral blade is attached to the rotating shaft, An incinerator has been proposed in which the material to be treated on the hearth is transferred and stirred by the rotation of the spiral blades (Japanese Patent Laid-Open No. 53-56870).

In this improved rotary hearth type incinerator,
The material to be processed that is supplied to the peripheral part of the rotary hearth is stirred by a spiral blade rotating above the hearth, and as the hearth rotates, it is transferred to the outlet in the center of the hearth and incinerated. Increased efficiency.

However, the above-mentioned rotary hearth type incinerator is not completely free from drawbacks. In other words, the objects to be incinerated are generally not uniform in shape and difficulty in burning; for example,
When attempting to incinerate waste tires and sludge at the same time, it may become difficult to simultaneously transport these objects using the rotating spiral blade.

In view of the above, the present invention provides an efficient rotary hearth type incinerator that makes it possible to simultaneously process large objects to be treated such as exhaust tires and waste materials such as sludge in the same incinerator. It was made for the purpose of In a rotary hearth type incinerator, the rotary hearth type incinerator is equipped with a to-be-processed incinerator that transfers the to-be-processed material supplied to the peripheral portion of the hearth to the central part as the rotary hearth rotates and discharges it from the discharge port. The device includes a guide plate located above the rotary hearth and outside approximately the midpoint of the radius of the rotary hearth, and a guide plate located above the rotary hearth and within approximately the midpoint of the radius of the rotary hearth. This relates to an incinerator consisting of rotating spiral blades.

The details of the present invention will be explained below with reference to the illustrated embodiments.

The rotary hearth type incinerator 1 includes a furnace wall main body 4 that has processing material supply ports 3 and 3' on a side wall 2 and defines a combustion chamber;
It has a rotary hearth 5 that constitutes the bottom surface of the furnace, and a part of the outer wall of the furnace wall body 4 and the rotary hearth 5 protrudes into a toy 6 that constitutes a water reservoir, so that the space between them is watertight. .

The rotary hearth 5 is rotated in a horizontal plane by a motor 7 via a speed reducer 8 and gears 9 and 10.

Further, the rotary hearth 5 has a discharge port 11 at its center, and the discharge port is connected to a lower cylindrical body 12 and opens into a storage box 13 for incinerated ash.

Windows 14 are provided in place in the side walls of the main body of the furnace wall, and these windows are fitted with burners and combustion air blowing tubes (not shown) as in conventional incinerators.

A rotating shaft 15 extends above the rotary hearth 5 through the furnace side wall in the radial direction of the rotary hearth, and is located at a center side from a position approximately halfway up the rotary hearth, a distance Ro from the periphery 16 of the rotary hearth. A spiral blade 17 is attached to the rotating shaft portion.

Note that the spiral blade 17 is rotated by the motor 18 via a reduction gear device 19 in a direction to transfer the object to be processed on the hearth toward the center.

Further, above the rotary hearth, guide plates 20, 20' are provided which are held through the furnace side wall.

Here, the guide plates 20, 20 are provided on the rotary hearth at positions closer to the outer periphery of the rotary hearth 5,
It is attached in an inclined state with respect to the circumferential direction so that the processed material supplied from the supply ports 3, 3' is transferred toward the center.

Reference numeral 21 denotes an auxiliary stirring device, which is rotated by a motor 22 via a speed reducer 23 to crush and stir the material to be processed on the hearth.

In the incinerator with the above configuration, large waste materials such as automobile tires are supplied from the supply port 3 to the periphery of the rotary hearth 5 and are burned and incinerated while being rotated and transferred together with the rotary hearth. However, in the early stage of the incineration process, large objects of this type are guided toward the center of the hearth by guide plates 20, 20' installed above the rotary hearth 5 near the periphery. will be moved to

In this way, after the combustion of the material to be processed progresses and the material to be processed reaches a stage where it can be crushed, the material to be processed is crushed by the rotating spiral blades 17 located inside the rotary hearth. At the same time, it is further transferred toward the center while being stirred.

Further, from the supply port 3', a stirrable material to be treated, such as sewage sludge, is similarly supplied to the peripheral portion of the rotary hearth, and directed to the central discharge port by the guide plates 20, 20' and then by the rotary spiral blade 17. The waste is then incinerated while being transported.

In the illustrated state, the auxiliary stirring device 21 is located approximately at the center in the radial direction of the rotary hearth 5, and crushes and stirs the burnt material to the extent that it can be crushed and stirred, thereby further increasing the incineration efficiency. Improve.

This auxiliary stirring device is located near the periphery of the rotary hearth 5 when the purpose is to stir a stirrable material to be treated, such as sludge or the like, supplied from the supply port 3'.

As described above, in the incinerator of the present invention, a transfer device for transferring the processed material supplied to the peripheral portion of the rotary hearth from the peripheral portion toward the central discharge port is used for the combustion of the processed material. At the initial stage, the material is transported by a guide plate, and from the stage when the material to be treated is burnt to the point where it can be crushed and stirred, it is stirred and transported simultaneously by a rotating spiral blade, so it takes a long time to incinerate and the incineration process slows down. In the early stages of the process, it is possible to simultaneously incinerate materials that are difficult to crush and agitate and materials such as sewage sludge in a single incinerator.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an incinerator showing an embodiment of the present invention. FIG. 2 shows a cross section taken along the line AA in FIG. In the figure, 1... Incinerator, 2... Furnace side wall, 3... Supply port to be treated, 3'... Supply port to be treated, 5... Rotating hearth, 15... Rotating shaft, 17... Spiral blade. , 20
...Guidance plate, 20'...Guidance plate.

Claims (1)

[Claims] 1. A furnace wall main body having a supply port for the material to be processed on the side wall and defining a combustion chamber, a rotary hearth having a discharge port in the center, and the material being supplied from the supply port to the peripheral portion of the rotary hearth. In a rotary hearth type incinerator, the rotary hearth type incinerator includes a material transfer device that transfers the material to be processed to a central portion as the rotary hearth rotates and discharges the material from a discharge port, wherein the material transfer device is arranged above the rotary hearth. ,and,
It is composed of a guide plate located outside of a position approximately halfway along the radius of the rotary hearth, and a rotating spiral blade located above the rotary hearth and inside of a position approximately midway along the radius of the rotary hearth. An incinerator characterized by: