JP3315035B2 - Grate of garbage incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plurality of grate of a refuse incinerator which are arranged in parallel in a front-rear direction and a lateral direction for transferring refuse between an upper refuse transfer space and a lower primary air supply space. .

[0002]

2. Description of the Related Art Conventionally, grate of this kind of garbage incinerator is
Some were formed using general castings.

[0003]

However, due to the recent increase in calories of garbage, the grate on which the burning garbage is directly placed is often placed at a high temperature. For this reason, in recent refuse incineration, the amount of primary combustion air supplied from below the stoker device tends to be reduced in order to reduce the heat generated by the combustion of refuse. However, if the amount of primary combustion air is reduced, it becomes difficult to effectively cool the grate. The grate is often formed of a general casting, and when such a grate is overheated, it is oxidized and corroded, and in some cases, the grate may be burned.
When such burnout occurs, the primary combustion air mainly escapes from the burnout position to above the stoker device, and the primary combustion air to be supplied to another grate decreases. As a result, there is a disadvantage that even a healthy grate may be burned out, and there is still room for improvement. SUMMARY OF THE INVENTION An object of the present invention is to provide a grate for a refuse incinerator having an excellent cooling function, which solves the drawbacks of the prior art.

[0004]

According to a first aspect of the present invention, there is provided a grate for a refuse incinerator according to the first aspect of the present invention.
Between the upper dust transfer space (K2) and the lower primary air supply space (K1), the horizontal direction of the dust transfer
Arrange in close proximity and partially overlap in the front-back direction
And a grate for a refuse incinerator for incineration while transporting refuse , wherein the grate is made of porous metal, and primary combustion air (6) from the primary air supply space (K1) is provided. ) Is formed by the porous portion of the porous metal, and is formed inside the grate and formed by the ventilation hole (H).
Of the formed ventilation area over the length of the grate
A gas supply path (12) is formed in the region, and the gas supply path (1) is formed.
2) A high-pressure gas (13) is supplied to the gas supply path (1).
2) from the primary air supply space (K1)
It is characterized in that a gas press-fitting mechanism (S) is provided to squirt into both spaces between (K2) and to eliminate clogging of the ventilation hole (H). (Operation / Effect) If the grate is formed of a porous metal as in this configuration, the surface area of the grate can be increased, the cooling effect can be improved, and the ventilation holes can be formed by the porous metal. Since the combustion air is allowed to pass through the ventilation holes by forming the porous portion, the cooling effect of the grate can be further improved. If a gas supply path is formed inside the grate and a gas press-fitting mechanism is provided to eliminate clogging of the ventilation hole, clogging due to combustion ash or the like that has entered the inside of the ventilation hole can be removed. In addition, the ventilation performance and the cooling function of the grate can be favorably maintained. As a result, burning of the grate can be prevented, and the situation where combustion air blows through from a specific location can be effectively prevented, so that the conveyed dust can be uniformly burned. Also,
Since the grate itself has air permeability, the adjacent grate can be arranged in close contact with each other. Therefore, blow-by of the primary combustion air from a specific location can be more reliably prevented. In addition, when the adjacent grate is arranged in close contact with each other, there is a concern that the grate may malfunction due to thermal expansion of the stoker, but the voids of the porous metal reduce the thermal expansion of the grate. Since it has an absorbing function, no particular inconvenience occurs.

A grate for a refuse incinerator according to a second aspect of the present invention is the first grate of the first aspect of the present invention.
In carrying out the present invention, the gas injection mechanism (S)
Pressurized gas (13) is pulsed into the gas supply path (12).
It is characterized by being ejected. (Function / Effect) Injecting high-pressure gas in pulse form as in this configuration
Clogging due to combustion ash etc.
The grate can be effectively removed, and
It can maintain good performance and cooling function
Effect can be enhanced.

[0006]

Embodiments of the present invention will be described below with reference to the drawings.

(Outline of Incinerator) FIG. 1 shows a stoker device 1 of a general refuse incinerator. That is, the dust put into the hopper 2 is extruded and supplied to the inside of the furnace 4 by a pusher 3 provided at a lower portion thereof, and high-temperature primary combustion air 6 is supplied through a wind box 5 provided at a lower portion of the stoker device 1. The primary combustion air 6 is supplied to a primary air supply space K1 provided at a lower portion of the stoker device 1, and the primary combustion air 6 is passed through a dust transport space K2 provided above the stoker device 1, and the stoker device 1 agitates dust. The ash is dried, burned and incinerated while being transported, and the incinerated ash is accumulated in the ash pit 7.

The stoker device 1 includes a drying zone 8 for drying the supplied dust and heating it to a temperature near the ignition point, a combustion zone 9 for burning the dried dust, and an ashes for the dust burned in the combustion zone 9. And a combustion zone 10. Dry zone 8
A wind box 5 for supplying the primary combustion air 6 is provided at a lower portion of each of the sections from to the post-combustion zone 10. The primary combustion air 6 supplied from the wind box 5 needs to pass through the portion where the grate 11 is provided and reach the refuse loaded on the upper portion of the grate 11. For that purpose, the grate 11 according to the present invention is formed of a porous metal. The grate 11 is made of, for example, Ni, C
A heat-resistant alloy to which alloying elements such as o, Cr, Al, Ti, Mo, and W are appropriately added is used. In actual forming, these alloy powders are formed by sintering or hot isostatic pressing (hereinafter referred to as “hot isostatic pressing”).
(Hereinafter referred to as “HIP formation”) .

If the grate is to be formed by HIP, H
The particle size, alloy component, and size of the metal powder used for forming the IP
In addition, the pressure conditions are arbitrarily selected to achieve the specified heat resistance.
Grate can be formed, and the size of the vent hole is set appropriately.
Then, the desired air permeability can be provided. Also, H
Can high strength grate be obtained by IP formation?
Are installed on the inner wall of the incinerator while the incinerator is operating.
If the refractory brick falls off on the grate,
The chance of the fire grate being deformed or broken is reduced. this
In addition, according to HIP formation, if only excellent in impact resistance
It is also possible to obtain a grate with excellent wear resistance, etc.
You.

FIG. 2 shows an example of the stoker device 1 constituted by using the grate 11 of the present invention. The grate 11 has two types, a fixed grate 11A and a movable grate 11B,
The movable grate 11B is reciprocated by a drive mechanism along the transport direction of the stoker device 1 while maintaining a sliding contact with the fixed grate 11A. In the conventional stoker device 1, the grate 11 is provided with a small space between the grate 11 to allow the primary combustion air 6 to pass therethrough. However, when the grate 11 of the present invention is used, the grate 11 itself has the ventilation holes H, and the primary combustion air 6 flows from the primary air supply space K1 to the trash transport space K2. It is easily breathable. Therefore, it is possible to dispose the fire grate 11 in a state where the fire grate 11 is closely contacted. For this reason, a large gap may not occur in a specific place between the grate 11 itself, and it is possible to prevent the primary combustion air 6 from flowing through a specific place. Further, if the ventilation of the primary combustion air 6 is ensured, dust can be completely burned over the entire stoker device 1 even if the supply amount of the primary combustion air 6 is reduced. Further, in the case of the grate 11 of this configuration, since the primary combustion air 6 passes through the inside of the grate 11 itself, the primary combustion air 6 necessary for incineration of refuse is supplied, and at the same time, the grate 11 is supplied.
Cools itself. Therefore, the chance that the grate 11 is burned can be reduced. In addition, as described above, when the grate 11 is closely arranged, there is a concern that malfunction may occur due to thermal expansion of the grate 11. Since it has a function of absorbing thermal expansion, it is considered that no particular problem occurs.

Although the stoker device 1 is constituted by simply using a grate 11 formed of a porous metal , in this case, although the ventilation of the primary combustion air 6 is free, the inside of the ventilation hole H There is a case where incineration ash etc. enters and clogs. For example, on the upper surface of the grate 11, it is conceivable that not only incineration ash is clogged but also that molten resin or the like enters the inside of the vent hole H. On the lower surface of the grate 11, the incineration ash that has fallen below the grate 11 may be blown up by the primary combustion air 6 and enter the inside of the ventilation hole H to cause clogging. Conceivable. Therefore, in order to eliminate such clogging, the grate 11 is provided with a gas injection mechanism S. That is, as shown in FIG. 3, a gas supply path 12 is provided inside the grate 11, and a high-pressure gas 13 is supplied from the compressor 14 to the grate 11 via a pipe 15. Further, a gas such as air is always compressed by the compressor 14 and an on-off valve 16
Is opened using the control device 17 at predetermined time intervals, thereby injecting the high-pressure gas 13 in a pulsed manner. As a result, the air permeability of the grate 11 can always be kept good, the supply of the primary combustion air 6 can be ensured, and more complete refuse incineration can be performed.

In the description of the appended claims, reference is made to the drawings and, in order to facilitate comparison with the drawings, reference numerals are used. However, the description is not intended to limit the present invention to the structure of the accompanying drawings. Absent.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an outline of a garbage incinerator.

FIG. 2 is a schematic view showing an example of a stoker device using a grate according to the present invention.

FIG. 3 is an explanatory view showing a grate according to another embodiment.

[Explanation of symbols]

 6 Primary combustion air 13 High pressure gas H Vent hole K1 Primary air supply space K2 Transport space S Gas press-in mechanism

──────────────────────────────────────────────────続 き Continuation of front page (72) Inventor Jun Funakoshi 1-1-1, Nakamiya Oike, Hirakata City, Osaka Prefecture Kubota Corporation Hirakata Factory (56) References JP-A-8-128612 (JP, A) JP 48-79168 (JP, A) JP-A-7-179907 (JP, A) JP-A-5-28909 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F23G 5 / 00 F23H 7/08

Claims (2)

(57) [Claims] 1. A dust transfer direction is defined between an upper dust transfer space (K2) and a lower primary air supply space (K1) .
And arrange them closely in the horizontal direction, and
And incineration while transporting garbage
A grate of a garbage incinerator, wherein the grate is made of porous metal, and primary combustion air (6) from the primary air supply space (K1) is transferred to an upper garbage transport space (K2). The ventilation hole (H) for supplying the ventilation is constituted by the porous portion of the porous metal, and the inside of the grate is formed.
And among the ventilation areas formed by the ventilation holes (H),
A gas supply passage (12) in a region extending in the longitudinal direction of the grate;
A high-pressure gas (13) in the gas supply path (12 ).
To supply the primary air from the gas supply passage (12).
Injects into both the entry space (K1) and the garbage transport space (K2)
A grate of a garbage incinerator provided with a gas injection mechanism (S) for discharging and eliminating clogging of the ventilation holes (H). 2. The gas injection mechanism (S) supplies the high-pressure gas (13) to the gas supply path (12) in a pulsed manner.
The grate of a garbage incinerator according to claim 1.