JP2634065B2 - Metal wall structure of stoker type municipal waste incinerator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides a metal wall on a lateral side of a combustion chamber, an air cooling chamber behind the metal wall, and air in the air cooling chamber for secondary combustion. The present invention relates to a stoker-type municipal garbage incinerator provided on the metal wall with a plurality of openings that are blown out as air into the combustion chamber in a direction in which the incinerated material is fed.

[Conventional technology]

In the conventional stoker-type municipal garbage incinerator, each of the openings is only formed to a certain size.

[Problems to be solved by the invention]

For this reason, the air in the air-cooling chamber is blown out from each of the openings only at a certain rate, and in places where high-calorie plastics and the like are accumulated in a large amount in the combustion products moving in the combustion chamber, the air amount is large. Due to lack of gas, the metal wall becomes partially hot and burns out, and in places where there are many low-calorie objects, the combustion temperature is lowered due to excessive air volume and NO _x
In some cases.

An object of the present invention is to make it easier to burn incinerated materials transferred in a combustion chamber at an appropriate temperature.

[Means for solving the problem]

The characteristic configuration of the metal wall structure of the stoker-type municipal refuse incinerator in the present invention is that an opening is opened at a high temperature, and a bimetal that closes at a low temperature is provided in a part or all of the plurality of openings. The operation and effect are as follows.

(Operation)

In other words, when high-calorie materials such as plastics are sent as incineration, the bimetal provided in the opening at approximately the same position as the incineration opens due to the rise in temperature accompanying the combustion of the incineration, and the air-cooled room is opened. Air blows out more than the other openings, preventing the metal wall from becoming partially hot, and the bimetal provided in the opening at almost the same position as the low-calorie incinerated material reduces the temperature. Close with it, let the air in the air cooling chamber blow out less than the other openings,
Prevent lowering of combustion temperature of combustion products.

〔The invention's effect〕

Therefore, the incinerated NO _x is combusted in less suitable temperatures generated in the combustion chamber, in order to prevent the metal wall is partially high temperatures, allows long-term use without burning the metal wall In addition, for example, a sensor that detects the temperature near the opening and an opening and closing device such as a damper that mechanically opens and closes the opening are provided in the opening, and the opening and closing device is opened and closed based on the temperature detection of the sensor, and the air from the opening is opened. Although it is conceivable to adjust the blowing amount, in this case, the structure is complicated and the equipment cost is high.On the other hand, according to the present invention, the air blowing amount from the opening is adjusted by a simple structure in which only a bimetal is provided in the opening. As a result, the service life of the metal wall can be easily extended with low equipment cost, and the economic efficiency can be improved.

〔Example〕

 Next, embodiments of the present invention will be described with reference to the drawings.

As shown in Fig. 2, an urban garbage storage pit (1)
And a stoker-type municipal waste incinerator (2) for incinerating the object to be treated, and a flue gas treatment device (11) to constitute a city rubber treatment facility.

The incinerator (2) includes a hopper (5) for receiving an object to be processed from a pit (1) intermittently supplied by a transfer device (4) using a graph bucket, and a hopper (5) in the hopper (5). A pusher type supply device (6) for supplying an object to be processed into the furnace is connected to the object supply port (8) of the furnace body (7), and a belt-like state is provided near the supply port (8). A stoker (9) that conveys the object supplied in the combustion chamber (3) in the combustion chamber (3) is arranged in the furnace main body (7), and a stoker is provided on a furnace wall opposite to the supply port (8). An ignition burner (10) directed toward the supply port (8) is provided in the upper space of (9), and the supply port (8) is provided in the combustion gas space.
To the drying zone (A), the combustion zone (B), and the post-combustion zone (C) so as to be burned while being dried, and the gap of the stoker (9) is provided below the stoker (9). An ash chute (15) is provided to receive the incineration ash that has flowed down. As shown in FIGS. 1 and 2,
On both sides of the combustion chamber (3), metal plates (12) made of cast steel, respectively
Is provided with a metal wall (13) in which a number of are arranged side by side, an air cooling chamber (14) is provided behind the metal wall (13), and a blower (16) for supplying cooling air to the air cooling chamber (14) is connected. Yes, between the side edges of the metal plate (12) adjacent to the incineration material in the feed direction,
There is provided an interval (17) for blowing air in the air cooling chamber (14) to the combustion chamber (3) as secondary combustion air.

The heat resistance temperature of each of the metal plates (12) is about 800 ° C.
In order to continuously operate the incinerator (2) for a long time,
It must be cooled to about 400 ° C. or less, and therefore, as shown in FIG. 1, FIG. 3, and FIG. A band-shaped bimetal (18) is welded to one of the side edges of the adjacent metal plate (12) along the gap (17) so as to close sometimes,
The higher the temperature, the more the free end side of the bimetal (18) separates from the other adjacent metal plate (12) and increases the degree of opening with respect to the gap (17) (the phantom line in FIG. 3). Increase the amount of air blow, and make each metal plate (12)
The temperature is prevented from exceeding 400 ° C.

In other words, when high-calorie materials such as plastic are burned as incineration, the temperature rises when the temperature rises, and the bimetal (18) where the incineration is located is separated by a gap (17).
, The air in the air cooling chamber (14) is blown into the combustion chamber (3) in a large amount, and as a result, the temperature rise of the metal plate (12) is prevented.

(Another embodiment)

The metal wall (13) may be formed of a single metal plate, and the metal plate (12) may be formed without providing a gap (17) for blowing air between adjacent metal plates (12). ) A hole or a slit for blowing air may be provided in the white body, and these are collectively referred to as an opening.

In addition to welding the bimetal (18) to one of the adjacent metal plates (12), the bimetal (18) is welded over both metal plates (12) as shown in FIGS. It may be attached to the metal plate (12) so as to move far and near with the temperature change. In addition to providing the bimetal (18) in each of the openings (17), the openings (17) may be provided in every other or in a plurality of openings (17) arranged in the feed direction of the incinerated material.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the structure shown in the attached drawings.

[Brief description of the drawings]

The drawings show an embodiment of the metal wall structure of the stoker-type municipal incinerator according to the present invention. FIG. 1 is a perspective view of a main part, FIG. 2 is a schematic vertical sectional view of the entire incinerator, and FIG. FIG. 4 is a front view of a main part, FIG. 5 is a vertical sectional side view of a main part of another embodiment, and FIG. 6 is a front view of another embodiment.

Claims (1)

(57) [Claims] 1. A metal wall (13) is provided on the side of the combustion chamber (3), and an air cooling chamber (14) is provided on the back of the metal wall (13). In the stoker-type municipal garbage incinerator provided on the metal wall (13), a plurality of openings (17) to be blown out to the combustion chamber (3) as the next combustion air are arranged in the direction of feeding the incinerated material. A) a metal wall structure of a stoker-type municipal garbage incinerator, wherein a bimetal (18) that opens at high temperature and closes at low temperature is provided in some or all of the plurality of openings (17).