JPH07113442B2 - Boiler for garbage incinerator - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a combustion chamber of a waste incinerator boiler.

2. Description of the Related Art As shown in FIG. 2, the combustion chamber of a conventional refuse incinerator boiler is integrally formed above a grate 21. In such a combustion chamber 22, the combustion gas generated from the dust on the grate 21 is composed of a layer A containing a large amount of unburned gas and a layer B containing a large amount of excess air in layers. twenty two
It reaches the upper part, and is sent to the gas passage 22 through the bypass 23 in the form of a layer. Since these laminar flows reduce combustion efficiency, the lower portion of the rear wall 22b of the combustion chamber 22 is projected forward to form the nose portion 25, and the front and rear walls 22a, 22b of the lower portion of the combustion chamber 22 are formed.
A secondary air nozzle 26 is provided in each of the above, and the combustion gases A and B are agitated by the blown secondary air.

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention By the way, according to the above-mentioned conventional configuration, the amount of secondary air blown by the secondary air nozzle 27 is limited, and because of the jet flow with a small stirring force by the nozzle, a sufficient stirring and mixing effect is obtained. There was a problem that I could not get it.

It is an object of the present invention to solve the above problems and provide a boiler for a refuse incinerator that can sufficiently mix and mix combustion gas.

Means for Solving the Problems In order to solve the above problems, the present invention provides a refuse incinerator boiler having a descending passage for guiding combustion gas downward from a combustion chamber upper end portion above a grate via a bypass portion, A partition wall is provided in the combustion chamber in the width direction to divide the combustion chamber into a front combustion chamber above the front of the grate and a rear combustion chamber above the rear of the grate, and the flow rate of combustion gas at the upper end of the front combustion chamber. A flow control gate that can adjust the flow rate is arranged facing the bypass, and the exhaust port at the upper end of the rear combustion chamber is opened to face below the bypass communicating with the front combustion chamber, and the gas descending passage is subjected to secondary combustion. It is a room.

In the above configuration, the combustion gas containing a large amount of unburned gas generated from the front part of the grate is sent from the front combustion chamber to the secondary combustion chamber via the bypass part, but at the bypass part, the grate The combustion gas flow containing a large amount of excess air generated from the rear part is blown into the combustion gas flow diverting from the exhaust port at the upper end of the rear combustion chamber in an orthogonal manner and mixed and stirred. Therefore,
In the secondary combustion chamber, unburned components and excess air are mixed and combustion is promoted extremely efficiently.

In addition, the amount of combustion gas generated fluctuates due to changes in the quality of the burning dust, and the ratio of the amount of combustion gas discharged from the front combustion chamber to the amount of combustion gas discharged from the rear combustion chamber also fluctuates, resulting in mixing of combustion gas. Even if the condition deteriorates, the amount of combustion gas that passes through both combustion chambers can be adjusted by adjusting the amount of combustion gas that passes through the front combustion chamber using the flow rate adjustment gate installed at the outlet of the front combustion chamber. The ratio can be adjusted, and the combustion gases can be mixed effectively and the unburned components in the combustion gases can be efficiently burned in the secondary combustion chamber.

Embodiment One embodiment of the present invention will be described below with reference to FIG.

1A and 1B are combustion grate which stirs the dust thrown in from the feeding hopper 2 and sends it to the rear while stirring it.
On the front grate 1A, a large amount of combustion air is required because mainly volatile components are burned, and the combustion gas A containing a large amount of unburned components is generated because the flame rises sharply. Further, in the rear grate 1B, since the volatile content is reduced and the solid carbon is burned, the flame is generated by generating the combustion gas B containing a large amount of excess air.

The combustion chamber surrounded by the water tube wall 4 above the combustion chamber 3 on the grate is
A partition water pipe wall 5 in the width direction divides the front combustion chamber 6 above the front grate 1A and the rear combustion chamber 7 above the rear grate 1B. The upper end of the front combustion chamber 6 is communicated with a bypass portion (stirring / mixing zone) 9 through a gap of an aeration water pipe 8 that is continuous with the partition water pipe wall 5, and the combustion gas A flows from the bypass portion 9 into a gas descending passage. Is introduced into the secondary combustion chamber 10. Further, a flow rate adjusting gate 11 which can be moved up and down is arranged at the front part of the aeration water pipe 8 to adjust the flow rate of the combustion gas A.

On the other hand, in the rear combustion chamber 7, the discharge port 12 at the upper end is opened below the bypass 9 so as to direct the combustion gas B to the bypass 9 above the secondary combustion chamber 10 via the ventilation pipe 12a. It is configured such that the combustion gases A and B are mixed with each other and agitated by injecting the combustion gases A and B into the detouring combustion gas A at substantially right angles. Then, the agitated combustion gases A and B are transferred to the secondary combustion chamber 10
Will be introduced to. In the secondary combustion chamber 10, the uniformly mixed combustion gases A and B are completely combusted and guided to the heat exchange chamber 13.

According to the above-described embodiment, the combustion gas A containing a large amount of unburned components generated on the front grate 1A, and the combustion gas B containing a large amount of excess air generated on the rear grate 1B, The front combustion chamber 6 and the rear combustion chamber 7, which are each divided by the partition water pipe wall 5, are separated from each other, and the combustion gas B is discharged at the detour 9.
The secondary combustion chamber 10 is made to jet-collide with the combustion gas A diverting at an angle from 12 to uniformly mix and stir the combustion gases A and B.
Burn with. Therefore, the gas is collided with a larger gas flow rate than the conventional nose part and the secondary air nozzle, and it is sufficiently agitated and mixed, so that it is possible to mix the excess air with the unburned content, and the secondary combustion chamber Can be completely burned at 10.

By the way, the refuse incinerated in the refuse incinerator has a lot of raw products in the summer and a small amount of combustion gas, whereas it has a large amount of combustible components and a large amount of combustion gas in the winter. When the total amount of combustion gas is small, the combustion gas B passing through the rear combustion chamber 7
Therefore, the mixing and stirring in the bypass 9 cannot be performed efficiently. However, the flow rate adjusting gate 11 reduces the amount of the combustion gas A passing through the front combustion chamber 6 to increase the amount of the combustion gas B on the side of the rear combustion chamber 7 so that the combustion gas is effectively supplied in the bypass portion 9. Mixed and secondary combustion chamber 10
Thus, the unburned components in the combustion gas can be efficiently burned.

In the above embodiment, a secondary combustion air nozzle may be provided at the inlet, intermediate portion or outlet of the front combustion chamber 6 or the bypass 9 to blow in secondary air. It is also possible to provide an additional air nozzle in the secondary combustion chamber 10 to add combustion air.

Further, as a countermeasure against the decrease of the combustion gas temperature when the load is low, an additional heating burner may be provided in the bypass portion 9.

Further, the lower part of the partition water pipe wall 5 may be bent to improve the inflow of combustion gas.

Advantageous Effects of Invention According to the present invention as described above, in the bypass portion from the front combustion chamber to the secondary combustion chamber, in the combustion gas flow containing a large amount of unburned gas generated from the front portion of the grate. A combustion gas flow containing a large amount of excess air generated from the rear part of the grate is blown in an orthogonal manner from an outlet at the upper end of the rear combustion chamber to mix and stir. Therefore, the unburned components in both combustion gases and the excess air are mixed with each other, and complete combustion can be performed extremely efficiently in the secondary combustion chamber.

In addition, the amount of combustion gas generated fluctuates due to changes in the quality of the burning waste, and the ratio of the amount of combustion gas discharged from the front combustion chamber to the amount of combustion gas discharged from the rear combustion chamber also fluctuates, resulting in mixing of combustion gas. Even if the condition deteriorates, the amount of combustion gas that passes through both combustion chambers can be adjusted by adjusting the amount of combustion gas that passes through the front combustion chamber using the flow rate adjustment gate installed at the outlet of the front combustion chamber. The ratio can be adjusted, and the combustion gases can be mixed effectively and the unburned components in the combustion gases can be efficiently burned in the secondary combustion chamber.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a boiler for a refuse incinerator according to the present invention, and FIG. 2 is a schematic vertical sectional view of a conventional boiler for a refuse incinerator. 1A, 1B ... Combustion grate, 5 ... Partition water pipe wall, 6 ... Front combustion chamber, 7 ... Rear combustion chamber, 9 ... Detour section (stirring / mixing zone), 10 ... Secondary combustion chamber , 11 …… Flow rate adjustment gate, 12
……Vent.

Claims (1)

[Claims] 1. A waste incinerator boiler having a gas descending passage for guiding combustion gas downward from an upper end of a combustion chamber above a grate via a bypass, and a combustion chamber having a widthwise partition wall for combustion. The chamber is divided into a front combustion chamber above the front of the grate and a rear combustion chamber above the rear of the grate, and a flow rate control gate that can adjust the flow rate of combustion gas is located at the upper end of the front combustion chamber and faces the bypass. A boiler for a refuse incinerator, which is characterized in that the exhaust port at the upper end of the rear combustion chamber is opened facing the lower part of the bypass communicating with the front combustion chamber, and the gas descending passage is used as the secondary combustion chamber. .