JPH07233921A - Refuse incinerator - Google Patents

Abstract

PURPOSE:To provide a refuse incinerator which can completely burn exhaust gas without increasing a secondary combustion chamber and rapidly regulate a position of a burn-out point. CONSTITUTION:A dry zone A for conveying material to be incinerated while drying, a burning zone B for conveying the dried material to be incinerated while burning it, and an after-burning zone C for conveying the material to be incinerated while ashing it are sequentially disposed in a main combustion chamber 3. Secondary burning air supply mechanisms 14A, 14B for supplying secondary combustion air toward the vicinity of an upper end of a flame of the zone B from upstream and downstream sides along the material-to-be- incinerated conveying direction are provided. Thus, burnt up pint detecting means 16 for detecting the burn-out point of the material to be incinerated is provided, and air supply amount regulating means 15A, 15B for individually regulating air amounts supplied from the upstream and downstream sides by the mechanisms 14A, 14B are so provided as to make the point fall within a predetermined range based on the detected result of the means 16.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a main combustion chamber, in which a drying zone for transporting an incinerator while drying, a combustion zone for transporting a dried incinerator while burning, and an ash for burning the incinerator. The present invention relates to a stoker-type refuse incinerator that is configured by sequentially arranging post-combustion zones that are conveyed while being converted.

[0002]

2. Description of the Related Art Secondary combustion air for completely burning exhaust gas after primary combustion in a main combustion chamber is exhaust gas passing through a flue which is provided in an upper space of the main combustion chamber and constitutes a secondary combustion chamber. There was a nozzle at the entrance of the flue.

[0003]

Generally, in order to completely burn a gas containing carbon monoxide, a high temperature of several hundred degrees is required.
It is necessary to sufficiently supply and agitate oxygen and to secure a sufficient combustion time. However, in the above-mentioned conventional technology, in the secondary combustion chamber, oxygen, that is, combustion air and exhaust gas is used against a strong updraft. It was difficult to stir the mixture uniformly, and it was necessary to secure a long flue to secure a sufficient combustion time, and there was a drawback that the equipment was large and economically inefficient. An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[0004]

In order to achieve this object, the characteristic constitution of the refuse incinerator according to the present invention is that the upper part of the flame on the combustion zone is from the upstream side and the downstream side along the conveying direction of the incineration object. The point is that a secondary combustion air supply mechanism for supplying secondary combustion air toward the vicinity of the tip is provided. In the above-mentioned configuration, a burn-out point detecting means for detecting the burn-out point of the incineration object is provided, and the burn-out point falls within a predetermined range based on the detection result by the burn-out point detecting means. It is preferable to provide air supply amount adjusting means for individually adjusting the amount of air supplied from the upstream side and the downstream side by the secondary combustion air supply mechanism.

[0005]

With the secondary combustion air supply mechanism, the secondary combustion air is supplied from the upstream side and the downstream side in the conveying direction of the incineration object toward the vicinity of the upper tip of the flame on the combustion zone. As a result, the carbon monoxide can be agitated with the combustion air in a dispersed state before the exhaust gas is converged on the flue and becomes a vigorous ascending airflow, so that the carbon monoxide and oxygen are sufficiently agitated. Since the stirring is performed before the exhaust gas is guided to the flue that constitutes the secondary combustion chamber, the combustion time in the secondary combustion chamber is sufficiently secured.

Further, if constituted as described above, the burn-out point for avoiding the generation of unburned dust in the post-combustion zone (refers to the position where the gas combustion is stopped and only the solid combustion is transferred on the combustion zone). Position is adjusted by adjusting the amount of air supplied from the upstream side and the downstream side by the secondary combustion air supply mechanism. For example, when there is a possibility that unburned dust will be generated due to the burn-out point moving to the downstream side, the combustion air on the upstream side is reduced by the air supply amount adjusting means, and the amount of combustion air supplied from the downstream side. Is increased to push the high temperature gas against the incineration object on the upstream side to promote combustion on the upstream side to move the burn-out point to the upstream side, and the burn-up point moves to the upstream side to generate unburned dust. However, if the combustion zone is not effectively used, the amount of combustion air from the downstream side is reduced and the amount of combustion air from the upstream side is increased by the air supply amount adjustment means. Then, the burn-out point is shifted to the downstream side.

[0007]

EFFECTS OF THE INVENTION According to the present invention, a sufficient combustion time can be secured in a state where carbon monoxide and oxygen are sufficiently agitated without constructing a long flue, and complete combustion of exhaust gas is achieved. As a result, it has become possible to provide a refuse incinerator that can reduce the amount of dioxin generated, which is correlated with the carbon monoxide content in exhaust gas.

Furthermore, since the burn-out point can be adjusted by the air supply amount adjusting means, it has become possible to provide a refuse incinerator which can improve the incineration efficiency while avoiding the generation of unburned dust.

[0009]

EXAMPLES Examples will be described below. As shown in FIG. 2, the incinerator for municipal waste conveys the materials to be incinerated (such as municipal waste) thrown into the hopper 2 to the main combustion chamber 3 by the reciprocating drive of the pusher 1 provided below the main combustion chamber 3. The ash incinerated in the combustion chamber 3 is collected in the ash pit 4.

The main combustion chamber 1 has a drying zone A for drying the incineration object and heating it to a temperature near the ignition point, a combustion zone B for burning the dried incineration object, and a post-combustion zone for ashing the incineration object. C is arranged stepwise from the upper side to the lower side, and air supply means 12 for supplying the primary combustion air from the lower side is provided. In the dry zone A, the combustion zone B, and the post-combustion zone C, fixed grate and movable grate are alternately arranged in the arrangement direction, and the relative movement of the grate in the arrangement direction stirs and conveys the dust. It is composed of a stoker type conveying means 5. Further, combustion control means (not shown), which is a computer or the like, is provided for adjusting the transfer speed of the pusher 1 or the transfer means 5 or the supply amount from the air supply means 12 for stable combustion.

In the space above the main combustion chamber 3 and above the combustion zone B, there is a flue 13 that constitutes a secondary combustion chamber that completely burns the exhaust gas after primary combustion, and the waste heat boiler 9 is located downstream thereof.
After the heat energy in the exhaust gas is taken out in the form of steam by the waste heat boiler 9 and supplied to the generator 10, the exhaust gas treatment facility 1 including an electric dust collector and the like is provided.
1 removes dust and harmful gases and exhausts from the chimney.

Upper wall surface 3 of main combustion chamber 3 with flue 13 in between
Is provided with secondary combustion air supply mechanisms 14A and 14B including a plurality of nozzles for supplying the secondary combustion air toward the vicinity of the upper tip of the flame on the combustion zone B. Before being converged into a violent updraft, the carbon monoxide is agitated and mixed with the secondary combustion air in a dispersed state. Further, the blower fan and the damper for adjusting the supply amount of the secondary combustion air by the secondary combustion air supply mechanisms 14A and 14B from the upstream side and the downstream side, respectively, along the conveyance direction of the incineration object, and the damper. Air supply amount adjusting means 15A and 15B which are control circuits for controlling the opening are provided.

A plurality of optical sensors are attached above the side wall of the main combustion chamber 3 along the conveying direction of the incineration object, and the burn-out point for detecting the burn-out point of the incineration object in the combustion zone B is detected from the detected light amounts thereof. The cut point detecting means 16 is configured. When the burn-out point detected by the burn-out point detecting means 16 moves to the downstream side and unburned dust is likely to be generated, the air supply amount adjusting means 15A and 15B are operated from the upstream side by the air supply amount adjusting means. The amount of combustion air of
In addition, the amount of combustion air supplied from the downstream side is increased to promote combustion of the incineration material on the upstream side to quickly move the burnout point to the upstream side, and the burnout point moves to the upstream side. However, if the combustion zone is not effectively used, the amount of combustion air from the downstream side is reduced by the air supply amount adjusting means, and the amount of combustion air from the upstream side is reduced. The amount of air supply is increased to quickly move the burn-out point to the downstream side.

Further, the combustion control means stabilizes the combustion state by correcting the transport speed of the incineration material by the transport means 5 according to the adjustment state by the air supply amount adjusting means 15A and 15B. For example, the amount of combustion air from the upstream side is reduced by the air supply amount adjusting means, and the amount of combustion air supplied from the downstream side is increased to promote the combustion of the incineration object on the upstream side to burn. When moving the cut-off point to the upstream side, the conveying speed is reduced, the amount of combustion air from the downstream side is reduced by the air supply amount adjusting means, and the amount of combustion air supplied from the upstream side is increased. When moving the burn-out point to the downstream side, the transport speed is increased.

Another embodiment will be described below. In the above embodiment, the secondary combustion air supply mechanism 14A, 14B has been described with a plurality of nozzles, but the number of nozzles, the installation angle, etc. can be appropriately set according to the shape of the furnace.
Further, the secondary combustion air supply mechanisms 14A and 14B are not limited to the above-mentioned configuration, but as shown in FIG.
For example, slits S parallel to the width direction of the combustion zone B may be formed on the upper wall surface 3 that sandwiches the flue 13 of the main combustion chamber 3.

In the above embodiment, the secondary combustion air is not particularly limited, but as the secondary combustion air, outside air may be supplied at room temperature, or as shown in FIG.
You may heat and supply via the supply path 17 along the side wall and upper wall of the main combustion chamber 3. In this case, the secondary combustion can be performed in a good state by avoiding the temperature decrease of the exhaust gas for the secondary combustion.

It should be noted that although reference numerals are given in the claims for convenience of comparison with the drawings, the present invention is not limited to the structures of the accompanying drawings by the entry.

[Brief description of drawings]

[Fig. 1] Schematic diagram of garbage incinerator

FIG. 2 is a front view of a main part showing another embodiment.

FIG. 3 is a sectional view of a main part showing another embodiment.

[Explanation of symbols]

 3 Main combustion chambers 14A, 14B Secondary combustion air supply mechanism A Dry zone B Combustion zone C Post-combustion zone

Claims (2)

[Claims] 1. A drying zone (A) for transporting an incineration object to a main combustion chamber (3) while drying, a combustion zone (B) for transporting a dried incineration object while burning, and an incineration target. A stoker-type waste incinerator configured by sequentially arranging a post-combustion zone (C) for transporting while incinerating an object, the upstream side and the downstream side along the transportation direction of the incinerated object, A secondary combustion air supply mechanism (14A) for supplying secondary combustion air toward the vicinity of the upper tip of the flame on the combustion zone (B),
Garbage incinerator equipped with (14B). 2. A burn-out point detection means (16) for detecting the burn-up point of the incineration object is provided, and the burn-up point falls within a predetermined range based on the detection result by the burn-up point detection means (16). In order to enter, air supply amount adjusting means (15A), (15B) for individually adjusting the amount of air supplied from the upstream side and the downstream side by the secondary combustion air supply mechanisms (14A), (14B) are provided. The refuse incinerator according to claim 1, which is provided.