JPH0752005B2 - Municipal waste incinerator - Google Patents

Description

TECHNICAL FIELD The present invention relates to a municipal solid waste incinerator whose side walls are air-cooled walls.

[Conventional technology and its problems]

Conventionally, in this type of incinerator, the entire amount of the cooling air supplied into the air cooling wall is introduced into the furnace, whereby the temperature of the furnace wall is adjusted and clinker is prevented.

Further, the cooling air introduced from the air cooling wall is used as combustion air together with the air supplied from the stoker at the bottom of the furnace.

By the way, the air cooling wall air and the air under the stoker must be distributed in a well-balanced manner depending on the combustion state in the furnace.

However, as described above, in the structure in which the entire amount of cooling air supplied to the air cooling wall is introduced into the furnace as air cooling wall air, the amount of air cooling wall air is limited by the furnace wall temperature, so air cooling wall air and stoker The balance of the amount of lower air may not be maintained properly.

For example, even if the amount of combustion air supplied to the furnace is kept constant, the amount of air under the stoker is increased, and the amount of air on the other side of the cooling wall is reduced, air cooling is performed to prevent the temperature of the furnace wall temperature from rising. If you cannot throttle the air volume on the wall,
The amount of air under the stoker cannot be increased.

As described above, in the conventional incinerator, the balance between the amount of air under the stoker and the amount of air of the air cooling wall cannot be freely changed.

Then, this invention aims at providing the incinerator which can change the balance of the amount of air under a stoker and the air of an air cooling wall freely.

[Means for solving problems]

In order to solve the above problems, the present invention provides an air cooling wall of an incinerator with a return duct for drawing out a part of cooling air in the air cooling wall, and an end portion of the return duct is connected to an air supply line of a stoker. By connecting them, a part of the cooling air in the air cooling wall is supplied from the stoker into the furnace.

[Action]

In the incinerator with the above structure, part of the cooling air in the air cooling wall is directly fed into the furnace and part of it is fed from below the stoker. The amount of air introduced into the furnace and the amount of air introduced into the furnace from the stoker can be freely balanced.

〔Example〕

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

A multi-stage stoker 2 is provided at the bottom of the incinerator 1, and the refuse supplied from the hopper 3 is put into the furnace by the pusher 4, and the refuse put into the furnace is sequentially sent forward by the stoker 2. It is like this.

Air is blown into the furnace from below the stoker 2 by a forced air blower 5, and a damper 7 is installed in the air supply line 6 so that the amount of air can be adjusted by the damper 7. Has become.

An air cooling wall 8 is formed on the side wall of the incinerator 1. The air cooling wall 8 is composed of a cooling chamber 9 and a wall plate 10 made of cast steel attached to the front surface of the cooling chamber 9, and cooling air is supplied from below the cooling chamber 9 by an air cooling wall blower 11.
A part of the cooling air supplied into the cooling chamber 9 is the wall plate 10.
It is designed to blow into the furnace from between. A damper 13 is also installed in the air supply line 12 that supplies this cooling air to the cooling chamber 9, and the amount of air supplied to the cooling chamber 9 can be adjusted by this damper 13.

A return duct 14 is inserted into the cooling chamber 9 from the back side, the end of the return duct 14 is connected to the air supply line 6 of the stoker 2, and a part of the cooling air in the cooling chamber 9 is stokered. 2 is drawn to the air supply line 6. A damper 15 is also installed in the return duct 14 so that the damper 15 can adjust the amount of air.

The incinerator of the present invention has the above-described structure, and the amount of air supplied into the furnace can be controlled by opening / closing the three dampers 7, 13, and 15.

For example, when it is desired to increase the amount of air under the stoker 2 and to suppress the amount of air introduced from the air cooling wall 8 in the opposite direction while keeping the amount of air introduced into the furnace constant, the furnace wall temperature of the air cooling wall 8 is high. ,
When it is necessary to supply a large amount of cooling air to the cooling chamber 9 of the air cooling wall 8, the damper 13 of the air cooling wall blower 11 is opened to supply a large amount of cooling air into the cooling chamber 9 while the return duct is provided.
The damper 15 of 14 is opened widely, the cooling air in the cooling chamber 9 is drawn out into the return duct 14, and the amount of air flowing from the front surface of the air cooling wall 8 into the furnace is suppressed. Since the air drawn into the return duct 14 is supplied from below the stoker 2, the damper 7 is adjusted so that the amount of air supplied from the return duct 14 is not sufficient by the pushing blower 5. To do.

In this way, the balance between the amount of air introduced into the furnace from the air cooling wall 8 and the amount of air introduced into the furnace from below the stoker can be adjusted by the opening angles of the three dampers 7, 13, 15.

In addition, opening and closing of the three dampers 7, 13, 15 are
The amount of evaporation of the residual heat boiler, the amount of incineration, the amount of NOx generated, etc. are detected and automatically controlled.

〔The invention's effect〕

As described above, according to the present invention, it is possible to freely change the amount of air introduced into the furnace from the air cooling wall and the amount of air introduced into the furnace from below the stoker. There is an effect that it can be properly maintained according to the internal combustion state.

[Brief description of drawings]

FIG. 1 is an overall sectional view of an incinerator according to the present invention, FIG. 2 is an enlarged sectional view of an air cooling wall portion of the same, and FIG. 3 is a schematic diagram showing an air supply line. 1 ... incinerator, 2 ... stoker, 5 ... forced air blower, 6
...... Air supply line, 8 ... Air cooling wall, 9 ... Cooling chamber, 10
…… Wallboard, 14 …… Return duct.

Claims (1)

[Claims] 1. A municipal solid waste incinerator in which a side wall is constituted by an air-cooling wall and combustion air is supplied into the furnace from the air-cooling wall and a stoker at the bottom of the furnace, respectively. A return duct for extracting a part is provided, an end of the return duct is connected to an air supply line of the stoker, and a part of the cooling air in the air cooling wall is supplied from the stoker into the furnace. Municipal refuse incinerator.