JPS6023715A - Vertical type circular agitation incinerating furnace - Google Patents

Abstract

PURPOSE:To improve the efficiency of incineration through further stabilization of combustion of a substance to be incinerated, by a method wherein the bottom of a furnace is covered in a layer with sand, and the air is injected through the bottom of the furnace. CONSTITUTION:Sand is placed on a bottom 13 of an incinerating furnace to form a sand layer A. The lower end of each of agitating devices 16 extends throughout to the surface part of the sand layer A. Air feed holes 18 are arranged to supply a fresh air to the layer A therethrough, and are adapted to prevent overheating of the sand layer A and uniformly feed the air to the substance to be incinerated for uniform combustion, resulting in further improvement of incinerating efficiency and in prevention of the production of clinker. This constitution prevents interruption of an incinerating work resulting from breakdown of the furnace bottom or the agitating devices or stop of an agitator due to the presence of pebbles or iron pieces mixed in the incinerating furnace, and causes the furnace bottom itself to be protected by the heat insulating action of the sand layer, resulting in stable combustion.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a vertical circular stirring incinerator, and is particularly characterized in that the bottom of the furnace is covered with a layer of sand and pebbles, and air is blown in from the bottom of the furnace.

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. For example, incinerators for powdery incineration materials such as sludge have a vertically circular furnace body, and stirring blades are installed in the single layer near the bottom of the furnace. This figure shows a circular stirring incinerator equipped with stirring blades. In the figure, reference numeral 1 is a circular incinerator main body, and an exhaust port 2 is formed in the upper part, and a stirring device is provided inside the furnace. Furthermore, an auxiliary burner 3 for ignition, a dry sludge input feeder 4, an ash outlet 5, etc. are attached.

The stirring device stirs the materials to be incinerated that have been put into the furnace to prevent the materials from clumping together and to improve contact with the air so that the entire material is evenly burned. A rotary shaft 7 is erected, two or more stirring blades 8 are radially attached to the top of the rotating shaft 7, and a large number of stirring hands 9 are further provided downwardly projecting from the stirring blades 8. Needless to say, the stirring hand 9 stirs the material to be incinerated placed in the furnace bottom 6, so its lower end reaches near the furnace bottom surface. and,
These rotating shaft 7, stirring blades 8, and finger pusher 9 are all hollow bodies and are electrically connected to each other.A blower 10 is connected to the rotating shaft 7, and a large number of blowholes 11 are connected to the finger pusher 9.
It has holes in it, from which air is blown out and sprayed directly onto the waste that has been 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, or If clinker is generated, these solids will be trapped between the furnace bottom 6 and the stirring hand 9, which may damage the stirring hand 9 or stop the stirring device from rotating, resulting in incineration. Accidents may occur that make it impossible to continue work.

The present invention solves the above-mentioned drawbacks of the conventional incinerator, and the bottom of the incinerator is covered with sand and pebbles to an appropriate thickness, giving the appearance of an upper bottom. The lower end of the stirring hand is raised and there is a gap between it and the true bottom of the hearth to eliminate accidents where solids get caught, and air is blown out from the bottom of the hearth to make the combustion of the materials to be incinerated more stable and improve incineration efficiency. This is a further improvement.

Hereinafter, the present invention will be specifically explained based on illustrated embodiments.

In the figure, 12 is the furnace body, 13 is the furnace bottom, and 14 is the rotating shaft 15.
1 is a stirring blade, and 16 is a stirring hand. These are similar to the conventional incinerator except that the lower end of the stirring hand 16 is located at a slightly higher position than that of the conventional incinerator. A blowout hole 23 and the like are installed, and sand and the like are put in the bottom of the furnace to form a sand layer A. The material and amount of this sand layer are not particularly limited, and should be the most suitable for the nature of the material to be incinerated, the amount of input, etc. For example, sand with a diameter of about 0.5 to 2 cm or pebbles with a relatively uniform particle size of about 10 to 70 cm are used. The thickness must be small (at least the size of the solid matter mixed in the material to be incinerated or the clinker generated in the furnace), and usually about 100 to 200 mm is appropriate. There is no problem in using ash instead of sand.It is important that the lower end of the stirring hand 16 reaches the surface layer of the sand layer A.

Reference numeral 18 is an air supply hole. This device supplies fresh air to the sand layer A, which prevents the sand layer A from overheating and also supplies air to every piece of material to be incinerated to ensure uniform combustion. This will further increase incineration efficiency and at the same time suppress the generation of clinker.

As detailed above, in the present invention, the sand layer A is formed at the bottom of the circular stirring incinerator, and new air is supplied to the sand layer. The incineration work will not be interrupted if the furnace bottom or stirring hand is damaged by solid objects such as pebbles, iron pieces, or clinker generated in the furnace, or the stirring device stops, and the furnace bottom itself is insulated by the sand layer. In addition, the heat retained in the sand layer absorbs uneven input, moisture content, and uneven calorific value, resulting in stable combustion.Furthermore, the sand layer absorbs fresh air. By suppressing local overheating and by uniformly supplying this air to the materials to be incinerated, more even and stable combustion of the materials to be incinerated is ensured, and the incineration efficiency is significantly increased. This not only improves hardness but also suppresses clinker formation.

[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... Furnace body 13... Hearth floor 14... Rotating shaft 15... Stirring blades 16...
- Stirring hand 17 River fume port 18...Air supply hole Patent applicant Okawara Seisakusho Co., Ltd. Figure 1 9 Figure 2

Claims (1)

[Claims] In a fibre-fired furnace, a rotating shaft is set up in the center of the hearth, stirring blades are attached radially to the top of the shaft, and many stirring hands are suspended from the stirring shaft.A sand layer is formed on the hearth, and the stirring blades are A vertical circular shape, characterized in that the lower end of the hand is formed at a height that reaches the surface layer of the sand layer, and a large number of air supply holes are formed in the bottom of the furnace to supply air to the sand layer. Stirring incinerator