JPH05272735A - Refuse incinerator for reducing co gas content in exhaust gas - Google Patents

Abstract

PURPOSE:To provide a refuse incinerator capable of suppressing CO gas in exhaust gas to a low concentration. CONSTITUTION:A refuse incinerator comprises: a combustion chamber 1 having fire grates 2; and a flue duct 4 having a dust hopper 3 provided in the downstream of the combustion chamber 1. An ejector 5 is provided which communicates from the bottom of the dust hopper 3 to the combustion chamber 1, and an air nozzle 6 is disposed above the ejector 5 so as to be directed toward the ejector 5. Thus, dust, unburnt substances, CO gas and the like contained in a combustion gas flowing through the flue duct 4 are returned to the combustion chamber 1, whereby complete combustion is promoted, and the generation of CO gas can be remarkably reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refuse incinerator used for incineration of municipal waste, industrial waste, etc., and more specifically, returns dust, CO gas and other unburned substances in a flue to a combustion chamber. , A new structure of an incinerator that completely burns these.

[0002]

2. Description of the Related Art As shown in FIG. 2, a conventional grate type incinerator has a combustion chamber (1) equipped with a grate (2) and a combustion chamber (1).
Equipped with a U-shaped flue (4) that guides the combustion gas generated in (1) to the gas outlet (8), and a dust hopper (3) formed at the U-shaped bottom of the flue (4). ing. Dust hopper (3)
Has a dust ejector (7).

The refuse (R) in the hopper (H) is placed on the grate (2) and burned by the air supplied from below the grate (2). The generated combustion gas is discharged from the gas discharge port (8) through the flue (4) and sent to an exhaust gas treatment device (not shown). The combustion gas entrains dust containing unburned matter, and this dust drops and accumulates on the dust hopper (3), and is appropriately discharged and removed by the dust discharging device (7).

[0004]

However, CO gas is generated from the unburned matter in the dust accumulated in the dust hopper (3), and the CO gas concentration required by the "Guideline for prevention of dioxins generation related to waste treatment" 50 ppm
The following values may not be obtained. CO gas has a problem that it reacts with chlorides such as hydrogen chloride gas to produce highly toxic dioxin. Therefore, reducing the CO gas concentration as much as possible is the most important environmental issue.

An object of the present invention is to solve the above problems and provide a refuse incinerator capable of suppressing CO gas in exhaust gas to a low concentration when incinerating municipal waste, industrial waste, etc. in the refuse incinerator. is there.

[0006]

The present invention has been devised in order to achieve the above-mentioned object.
By returning O gas and other unburned substances to the combustion chamber, C
It was completed based on the finding that O gas can be suppressed to a low concentration.

That is, the present invention is directed to waste incineration comprising a combustion chamber (1) equipped with a grate (2) and a flue (4) installed downstream of the combustion chamber (1) and equipped with a dust hopper (3). In the furnace, an ejector (5) communicating from the bottom of the dust hopper (3) to the combustion chamber (1) is provided, and an air nozzle (6) is installed above the ejector (5) toward the ejector (5). It is a waste incinerator characterized by being used.

The ejector (5) may have any shape, and extends from the bottom of the dust hopper (3) to the ceiling wall or side wall of the combustion chamber (1). High speed air or steam can be jetted from the air nozzle (6) above the ejector (5).

[0009]

[Operation] In the refuse incinerator of the present invention, the ejector (5) leading from the bottom of the dust hopper (3) to the combustion chamber (1)
Is provided above the ejector (5) with an air nozzle (6)
Are arranged in the direction of the ejector (5), dust, unburned matter and CO in the combustion gas of the flue (4)
Gas, etc. is returned to the combustion chamber (1) to promote complete combustion,
CO gas generation can be significantly reduced.

[0010]

EXAMPLES Next, the present invention will be described in detail with reference to the illustrated examples. In the description of the embodiments, with respect to the front-rear relationship, the left side of FIG. 1 is referred to as the front side.

[Embodiment] Referring to FIG. 1, a refuse incinerator according to the present invention comprises a combustion chamber (1) having a grate (2) and a combustion chamber (1).
Equipped with a U-shaped flue (4) that guides the combustion gas generated in (1) to the gas outlet (8), and a dust hopper (3) formed at the U-shaped bottom of the flue (4). ing.

An ejector (5) is formed to extend from the bottom of the dust hopper (3) to the rear of the ceiling wall of the combustion chamber (1). Further, an air nozzle (6) is arranged above the ejector (5) in the direction of the ejector (5).

In the above structure, the refuse (R) placed on the grate (2) is combusted by the air supplied from below the grate (2). Generated combustion gas is flue (4)
Dust, unburned matter and CO gas in the combustion gas are attracted toward the ejector (5) by the action of the air injected from the air nozzle (6) at the dust hopper (3), and the ejector (5) It is returned to the combustion chamber (1) through 5) and burned again.

The CO gas concentration at the gas outlet (8) of the waste incinerator according to the present invention shown in FIG. 1 and the conventional waste incinerator shown in FIG. 2 were measured.
However, it was less than 10 ppm in the present invention type. Thus, in the refuse incinerator according to the present invention, CO gas generation can be significantly reduced.

[0015]

According to the refuse incinerator of the present invention, since it is configured as described above, dust, unburned matter, CO gas, etc. in the combustion gas of the flue (4) are removed from the combustion chamber (1). , Complete combustion is promoted, and CO gas generation can be significantly reduced. As a result, it is possible to prevent the production of highly toxic dioxin due to the generation of CO gas, and to discharge the exhaust gas containing only a very small amount or no dioxin into the atmosphere.

[Brief description of drawings]

FIG. 1 is a vertical longitudinal sectional view showing a specific example of a refuse incinerator according to the present invention.

FIG. 2 is a vertical vertical sectional view showing a conventional refuse incinerator.

[Explanation of symbols] (1) ... Combustion chamber (2) ... Grate (3) ... Dust hopper (4) ... Flue (5) ... Ejector (6) ... Air nozzle (7) ... Dust discharge device (8) … Gas outlet (H)… Hopper (R)… Garbage

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Kondo 5-3-3, Nishikujo 5-chome, Konohana-ku, Osaka City Hitachi Shipbuilding Co., Ltd.

Claims (1)

[Claims] 1. A waste incinerator comprising a combustion chamber (1) equipped with a grate (2) and a flue (4) installed downstream of the combustion chamber (1) and equipped with a dust hopper (3). hopper
An ejector (5) communicating from the bottom of (3) to the combustion chamber (1) is provided, and an air nozzle (6) is arranged above the ejector (5) in the direction of the ejector (5). The feature is a refuse incinerator.