JPH0362967B2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a circular stirring incinerator, and in particular, is characterized in that the bottom of the furnace is covered with sand and pebbles in layers, and that the bottom of the furnace is provided with ventilation holes for blowing air, etc. be.

When incinerating materials to be incinerated, it is desirable to burn the entire material evenly in order to increase incineration efficiency and to suppress local temperature rise. Measures have been taken to distribute air evenly throughout the building. For example, an incinerator for incinerating materials such as filth is made into a solid circular shape, with stirring blades installed slightly above the bottom of the furnace, and a large number of stirring hands hanging from the stirring blades. The device is inserted into a container and stirred, and air is blown out from the stirring hand to incinerate the material to be incinerated while blowing air onto it.

FIG. 1 shows the above-mentioned circular stirring incinerator, and the reference numeral 1 in the figure is a circular incinerator main body, with an exhaust port 2 formed at the top and a stirring device at the bottom of the furnace. Further, an auxiliary ignition burner 3, a dry sludge input feeder 4, an ash outlet 5, etc. are attached. The stirring device stirs the material to be incinerated that has been put into the furnace to prevent the material from clumping together and to improve contact with the air so that the entire material is evenly burned. Two or more stirring blades 8 are radially attached to the top of an upright rotating shaft 7, and the stirring blades 8 are further provided with a number of stirring hands 9 projecting downward. Needless to say, the stirring hand 9 stirs the material to be incinerated that accumulates on the furnace bottom 6, so its lower end reaches near the furnace bottom, and these rotating shafts 7, stirring blades 8, and stirring hands 9
Both are hollow and conductive to each other,
A blower 10 is connected to the rotating shaft 7, and the stirring hand 9 has a large number of blowholes 11 through which air is blown out and directly blown onto the materials to be incinerated.

That is, as mentioned above, in the conventional circular stirring incinerator, the lower end of the stirring hand 9 reaches close to the bottom of the furnace, so solid materials such as pebbles and iron pieces may be mixed in with the materials to be incinerated, and the inside of the furnace may When clinker is generated, these solids are caught between the furnace bottom 6 and the stirring hand 9. As a result, accidents occur in which the stirring hand 9 is damaged or the rotation of the stirring device is stopped, making it impossible to continue the incineration work. Furthermore, because of this jamming, the effect of stirring the material to be incinerated, which is spread between the hearth bottom 6 and the stirring hand 9, is reduced, and contact with the air is also insufficient, resulting in uneven combustion.

The present invention solves the above-mentioned drawbacks of the conventional incinerator, and the bottom of the incinerator is covered with an appropriate amount of sand or pebbles, and this is used as an apparent hearth bottom. It is made higher than the true hearth bottom by an amount corresponding to the thickness of the pebbles to eliminate the chance of solids getting caught in the hearth.In addition, the sand or pebbles protect the hearth bottom, By providing a vent hole in the incinerator and sending in air, etc., the material to be incinerated is further stabilized and the incineration efficiency is further improved.

The present invention will be specifically described below based on illustrated embodiments.

In the figure, reference numeral 12 is a main body, 13 is a hearth bottom, 14 is a rotating shaft, 15 is a stirring blade, 16 is a stirring hand, 17 is a blowhole, and 18 is a ventilation hole. These are characterized in that the lower end of the stirring hand 16 is located at a slightly higher position than that of a conventional incinerator, and that a ventilation hole 18 is provided.Although not shown, the main body 12 includes an auxiliary burner, An input feeder, an outlet, etc. are attached, and the rotating shaft 14, stirring blades 15, and stirring hand 16 are electrically connected, and a blowhole 17 is bored in the stirring hand.

A sand layer A is formed by putting sand or pebbles into the incinerator constructed in this way. There are no particular restrictions on the composition particle size or amount of the sand or pebbles, and they are determined to be the most suitable for the properties of the material to be incinerated, the amount of input, etc. For example, sand has a larger apparent specific gravity than incineration ash, and is used with a relatively uniform particle size of about 0.5 to 2 mm in diameter. The thickness of the sand layer needs to be at least as large as the solid matter mixed in the material to be incinerated or the clinker generated in the furnace, and is usually about 100 to 200 mm. It is important that the lower end of the stirring hand 16 reaches the surface layer of the sand layer A.

The present invention is configured as described above, and has the following effects.

(1) Since the sand layer A is provided between the stirring hand 16 and the furnace bottom 13, solid materials such as pebbles and iron pieces are not mixed with the materials to be incinerated and thrown into the furnace, or clinker is generated in the furnace. Even if the incineration is carried out, there will be no accident where it gets caught between the hearth bottom and the stirring hand, and therefore the incineration work will not be interrupted due to damage to the hearth bottom or stirring hand or the stirring device to stop.

(2) In conventional incinerators, the materials to be incinerated close to or in close contact with the bottom of the furnace were not stirred and had poor contact with the air, resulting in uneven combustion, but in the present invention, the materials to be incinerated were Since it was placed on top of the sand layer A, the entire mixture was reliably stirred, so it burned evenly. Moreover, if a vent hole 18 was drilled in the bottom of the furnace and air was pumped in from there, it would be buried in the sand layer A. It is also possible to quickly burn incineration materials,
Furthermore, if a pre-dryer is available, it is also possible to control the temperature of the sand layer by sending in dry exhaust gas from the pre-dryer from the bottom of the furnace, and to appropriately cool the incinerated ash to prevent the generation of clinker.

(3) Since the surface layer of sand layer A reaches a temperature of several hundred degrees, the heat retained in the sand absorbs temperature changes and furnace load changes due to uneven loading of materials to be incinerated, moisture content, calorific value, etc., resulting in a stable furnace. Can be burned.

(4) The heat insulation effect of the sand layer suppresses the rise in temperature of the hearth bottom 13 and protects the hearth bottom, thereby reducing the fireproof structure of the hearth bottom.

As detailed above, in the present invention, a sand layer is formed at the bottom of the furnace, the lower end of the stirring hand is set at a height reaching the surface layer of the sand layer, and ventilation holes are provided at the bottom of the furnace. There is no stirring trouble, and the material to be incinerated is burnt uniformly throughout, and the incineration efficiency is significantly increased.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a conventional circular stirring incinerator, and FIG. 2 is a longitudinal sectional view showing an embodiment of the present invention. 12... Incinerator main body, 13... Hearth bottom, 14...
Rotating shaft, 15... Stirring blade, 16... Stirring hand, 17
... fumarole, 18... vent.

Claims (1)

[Scope of Claims] 1. In an incinerator in which a rotating shaft is erected in the center of the hearth bottom, stirring blades are attached radially to the top of the shaft, and a plurality of stirring hands are suspended from the stirring blades, the hearth A circular stirring incinerator is characterized in that a sand layer is provided, the stirring hand is formed at a height such that the lower end thereof reaches the surface layer of the sand layer, and a number of ventilation holes are bored in the bottom of the furnace.