JPH05280717A - Waste incinerating furnace - Google Patents

Abstract

PURPOSE:To mix and agitate unburnt gas with combustion air effectively and restrain the generation of CO, which becomes a generating factor of dioxine. CONSTITUTION:In a waste incinerating furnace, in which combustion air is supplied from the lower part of a stoker, a low-frequency generating device 35 for changing air, flowing through an air duct 30A, into low-frequency air and increasing the mixing and agitating effect of unburnt gas with the combustion air, is provided in the air duct 30A, communicating the combustion chamber 21 of the waste incinerating furnace with a blower 29 supplying the combustion air.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse incinerator for reducing unburned gas such as CO generated from an urban refuse incinerator.

[0002]

2. Description of the Related Art A conventional refuse incinerator will be described below with reference to the drawings. FIG. 3 is a schematic view of a conventional refuse incinerator.
Inside the combustion chamber 1 of this refuse incinerator, a drying zone 2, a combustion zone 3 and a post-combustion zone 4 are formed by a stoker.
A hopper 5 and a pusher 6 are provided on one side of the drying zone 2 side. Further, below the drying zone 2, the combustion zone 3 and the after-combustion zone 4, there are provided openings 7A of an air duct 7 for supplying combustion air, respectively, which communicate with a blower 9 via a damper device 8. There is.

The upper side of the combustion chamber 1 and the side of the dry zone 2 and the post combustion zone 4
Secondary air blowing ports 10 are opened on the side wall surfaces, and each secondary air blowing port 10 communicates with the blower 9 via a damper device 11.

In the above-mentioned conventional refuse incinerator, the dust introduced into the hopper 5 is cut out onto the drying zone 2 by the pusher 6, and the air supplied from the opening 7A of the air duct 7 in the drying zone 2 is cut off. As a result, the dust dries, and in the combustion zone 3 and the post-combustion zone 4, the dust is burned by the air supplied from the opening 7A. Primary air is blown from the opening 7A for these combustions.
Unburned gas such as CO is generated because the combustion is insufficient with only the primary air from 7A. Therefore, the unburned gas is burned by blowing the secondary air from the upper portion of the combustion chamber 1.

[0005]

However, as described above, the conventional refuse incinerator blows the secondary air to burn the unburned gas more completely, but the unburned gas and the secondary air are It was difficult to mix and stir effectively, and the unburned gas was sometimes discharged as it was without reacting with the secondary air. Since this unburned gas contains CO and the like and causes dioxins, it is necessary to keep it as low as possible and bring it closer to complete combustion.

The present invention has been made in order to solve the above-mentioned conventional problems, and CO which becomes a factor for generating dioxin by effectively mixing and stirring unburned gas and combustion air.
The object is to provide a refuse incinerator that suppresses the generation of waste.

[0007]

The refuse incinerator of the present invention comprises:
In a refuse incinerator that supplies combustion air from below the stoker, a low-frequency generator that changes the air flowing through the air duct into low-frequency air in the air duct that connects the combustion chamber of the refuse incinerator and the blower that supplies combustion air. Is provided.

[0008]

With the above-described structure, the combustion air receives low-frequency energy and vibrates by applying a low-frequency to the air flowing through the air duct to become low-frequency air. By sending this low-frequency air into the combustion chamber, the mixing / stirring effect of the unburned gas and the combustion air is enhanced, and the unburned gas generated in the combustion chamber is completely burned, reducing unburned gas such as CO. can do.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a schematic front view of a refuse incinerator according to an embodiment of the present invention, and FIG. 2 is a schematic side view thereof. The waste incinerator of this embodiment has the same basic structure as the conventional waste incinerator, and a hopper 23 and a pusher 24 for supplying the waste 22 are provided at one end side of the combustion chamber 21 of the waste incinerator. Provided in the combustion chamber
A drying zone 26, a combustion zone 27, and a post-combustion zone 28 are provided in a step-like manner at the bottom of 21 so as to become lower toward the discharge port 25. A blower 29 is installed near the refuse incinerator, and combustion air is sent to the combustion chamber 21 via an air duct 30. An opening 31 of an air duct 30 opens below the dry zone 26, the combustion zone 27, and the post-combustion zone 28, and the blower 29 is provided via a damper device 32.
Is in communication with. Further, a secondary air inlet 33 is provided on each of the wall surfaces of the upper part of the combustion chamber 21 on the dry zone 26 side and the post combustion zone 28 side, and communicates with the blower 29 via the damper device 32.

This embodiment differs from the prior art in that the combustion chamber
A low frequency air inlet 34 formed on the side wall of the furnace outlet of 21;
The air duct 30A communicates with the blower 29.
The point is that a low frequency generator 35 for converting the combustion air flowing through the air duct 30A into low frequency air is provided in the middle of 30A. The low frequency generator 35 is a device for generating a low frequency of 10 Hz to 20 Hz, and a known low frequency device is already used. By applying a low frequency to the air flowing through the air duct 30A, the combustion air receives low frequency energy and vibrates to become low frequency air. This low frequency air is used in the combustion chamber
By feeding it into 21, the mixing and stirring effect of unburned gas and combustion air is improved.

The operation of the above configuration will be described below. In this embodiment, dust put in the hopper 23
22 is cut by the pusher 24 on the uppermost dry zone 26,
It is the same as the conventional example in that it is dried in the drying zone 26 and moves toward the discharge port 25 while burning in the combustion zone 27 and the post-combustion zone 28.

Further, in order to incinerate the dust 22, primary air is blown from below the dry zone 26, the combustion zone 27, and the post-combustion zone 28, and a secondary air blowing port 33 provided at the upper part of the combustion chamber 21 It is also the same as the conventional example in that the secondary air is blown in.

However, since the secondary air does not mix well with the unburned gas, the unburned gas is released to the outside as it is, or CO in the unburned gas causes dioxins and the like. Therefore, a low frequency is applied to the combustion air to generate low frequency air, and this low frequency air is used in the combustion chamber 21.
The primary air, the secondary air, and the combustion exhaust gas are effectively mixed and agitated by being blown into the vicinity of the furnace outlet, and the generation of CO can be suppressed by increasing the reaction efficiency of the following chemical reaction.

CO + 1 / 2O ₂ → CO ₂ By feeding the low frequency air into the combustion chamber 21 in this way, the mixing and stirring effect of the combustion air and the unburned gas can be increased to reduce CO, and the dioxin Occurrence can be suppressed.

In the above embodiment, the low frequency air blowing port 34 is provided on the side wall of the combustion chamber 21 near the furnace outlet.
Is not limited to the position of the above embodiment, but may be any position as long as the combustion air and the unburned gas can be efficiently stirred, and is not limited to the position of the above embodiment.

Further, a secondary air inlet 33 is provided in the upper part of the combustion chamber 21 of the refuse incinerator in addition to the low frequency air inlet 34, but the low frequency air is blown from the secondary air inlet 33. It goes without saying that it is okay.

Although the embodiment has been described with respect to the refuse incinerator in which the dust on the stoker is incinerated while being conveyed from the hopper side to the discharge side by moving the movable rustle, the present invention is applicable to such a type of refuse incinerator. It is not limited.

[0018]

As described above, according to the present invention, with the above-mentioned constitution, the unburned gas and the combustion oxygen can be efficiently mixed and stirred to suppress the generation of the unburned gas, and the CO
Can be completely burned to suppress the generation of dioxins.

[Brief description of drawings]

FIG. 1 is a schematic front view of a refuse incinerator according to an embodiment of the present invention.

FIG. 2 is a schematic side view of a refuse incinerator according to an embodiment of the present invention.

FIG. 3 is a schematic view of a conventional refuse incinerator.

[Explanation of symbols]

 21 Combustion Chamber 22 Dust 29 Blower 30 Air Duct 30A Air Duct 35 Low Frequency Generator

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Shigeki Yamaguchi 1-247 Shikitsuhigashi, Naniwa-ku, Osaka-shi, Osaka Kubota Corporation

Claims (1)

[Claims] 1. In a refuse incinerator for supplying combustion air from below the stoker, an air duct communicating a combustion chamber of the refuse incinerator and a blower for supplying combustion air, and air flowing through the air duct is converted into low frequency air. A refuse incinerator characterized by being equipped with a low-frequency generator that changes.