JPH0468206A - Boiler for dust incinerator - Google Patents

Abstract

PURPOSE:To mix non-ignited substance with surplus air and promote an efficient combustion of the mixture by a method wherein combustion gas flow containing a large amount of excessive air generated at a rear part of a grid is blown into a combustion gas flow containing a large amount of non-ignited gas generated at a front part of the grid so as to mix them and agitate them at a bypassing part reaching from a front combustion chamber to a secondary combustion chamber. CONSTITUTION:A combustion chamber enclosed by a water pipe wall 4 above a combustion chamber 3 above a grid is divided into a front combustion chamber 6 above a front grid 1A and a rear combustion chamber 7 above a rear grid 1B by a partition water pipe wall 5 in a width direction. Combustion gas A containing a large amount of non-ignited substance occurred above the front grid 1A and combustion gas B containing a large amount of surplus air are separated into a front combustion chamber 6 and a rear combustion chamber 7 by a partition water pipe wall 5. Combustion gas B at a bypassing part 9 is injected and struck against bypassing combustion gas A from a discharging port 12 so as to perform a uniform mixing and agitating of combustion gases A and B and then the mixture is ignited in a secondary combustion chamber 10. The mixture is struck under a sufficient high flow rate of gas, a sufficient agitation and mixing is assured and surplus air can be mixed with the non-ignited substance and a complete combustion is assured within the secondary combustion chamber 10.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the structure of a boiler for a waste incinerator, particularly the combustion chamber.

BACKGROUND OF THE INVENTION As shown in FIG. 2, a combustion chamber of a conventional waste incinerator boiler is integrally formed above a grate 21. In such a combustion chamber 22, the combustion gas generated from the garbage on the grate 21 is A containing a large amount of unburned gas.
and B containing a large amount of excess air reach the upper part of the combustion chamber 22 in the form of a layer, and are sent to the gas passage 22 via the bypass portion 23 in a layered form. These laminar flows reduce combustion efficiency, so the lower part of the rear wall 22b of the combustion chamber 22 is made to protrude forward to form the nose part 25, or the lower part of the rear wall 22b of the combustion chamber 22 is
2. Secondary air nozzles 26 are provided on the front and rear walls 22a and 22b of the lower part, respectively, and the combustion gas A,
B is stirred.

SUMMARY OF THE INVENTION According to the above conventional configuration, the secondary air nozzle 27
This limits the amount of secondary air that can be blown in, and the jet stream with a small stirring force from the nozzle has problems in that a sufficient stirring and mixing effect cannot be obtained.

SUMMARY OF THE INVENTION An object of the present invention is to provide a boiler for a waste incinerator that can sufficiently stir and mix combustion gas by solving the above-mentioned problems.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a boiler for a waste incinerator having a gas descending passage that guides combustion gas from the upper end of the combustion chamber above the grate to the lower part via a detour. , a widthwise partition wall is provided in the combustion chamber 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. The lower part of the detour that communicates with the secondary combustion chamber is opened oppositely, and the gas descending passage is used as the secondary combustion chamber.

Effect 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 detour part, or is sent to the secondary combustion chamber through the detour part. The combustion gas stream containing a large amount of excess air generated from the rear part is blown orthogonally into the detouring combustion gas stream from the outlet at the upper end of the rear combustion chamber to be mixed and stirred. Therefore, in the secondary combustion chamber, the unburned matter and excess air mix, promoting combustion in an extremely efficient manner.

Example Hereinafter, one embodiment of the present invention will be described based on FIG.

IA and IB are combustion grates that stir the garbage input from the input hopper 2 and send it backwards to burn it.In the combustion chamber 3 above the grate, on the front grate IA, the garbage mainly evaporates or burns. A large amount of combustion air is required, the flame rises rapidly, and combustion gas A containing a large amount of unburned matter is generated.

Further, on the rear grate IB, the volatile content is reduced and solid carbon is burned, so that almost no flame is generated and combustion gas B containing a large amount of excess air is generated.

The combustion chamber surrounded by the water pipe wall 4 above the combustion chamber 3 on the grate is
It is divided by a partition water pipe wall 5 in the width direction into a front combustion chamber 6 above the front grate IA and a rear combustion chamber 7 above the rear grate IB. The front combustion chamber 6 is located at the upper end or at the partition water pipe wall 5.
The combustion gas A is communicated with a detour (stirring and mixing zone) 9 through a gap in an aeration water pipe 8 that is continuous with the detour 9, and the combustion gas A is introduced from the detour 9 into a secondary combustion chamber 10, which is a gas descending passage. In addition, a flow rate adjustment gate 11 that can be raised and lowered is provided at the front of the aeration water pipe 8.
is arranged, and the flow rate of combustion gas A is adjusted.

On the other hand, the exhaust port 12 at the upper end of the rear combustion chamber 7 has a detour section 9.
A water pipe 12 is opened facing downwardly to ventilate the combustion gas B.
a toward the detour section 9 above the secondary combustion chamber 10 side, and blows into the detouring combustion gas A at an almost perpendicular angle to mix and stir the combustion gases A and B. It is configured as follows.

The stirred combustion gases A and B are then introduced into the secondary combustion chamber 10. 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 embodiment, combustion gas A containing a large amount of unburned matter generated on the front grate IA, and combustion gas B containing a large amount of excess air generated on the rear grate IB, The front combustion chamber 6 and the rear combustion chamber 7 are separated by a partition water pipe wall 5, and the combustion gas B is injected and collided with the combustion gas A which is being detoured at an angle from the exhaust port 12 in the detour section 9. , the combustion gases A and B are uniformly mixed and stirred and combusted in the secondary combustion chamber IO. Therefore, compared to the conventional nose section or secondary air nozzle, the gas is collided with a larger flow rate and is sufficiently stirred and mixed, making it possible to mix excess air with unburned components, resulting in secondary combustion. Complete combustion can be achieved in the chamber 10.

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

Further, as a measure against lowering the combustion gas temperature during low load, a reheating burner may be provided in the detour section 9.

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

Effects of the Invention As described above, according to the present invention, in the detour section leading from the front combustion chamber to the secondary combustion chamber, the flow of combustion gas generated from the front part of the grate and containing a large amount of unburned gas is The combustion gas stream containing a large amount of excess air generated from the rear of the grate is
Blow in perpendicularly from the outlet at the top of the rear combustion chamber to mix and stir. Therefore, the unburned components and excess air in both combustion gases mix, allowing complete combustion to occur in the secondary combustion chamber in an extremely efficient manner.

[Brief explanation of the drawing]

FIG. 1 is a schematic longitudinal sectional view of a boiler for a waste incinerator according to the present invention, and FIG. 2 is a schematic longitudinal sectional view of a conventional boiler for a waste incinerator. lA, IB... Combustion grate, 5... Partition water pipe wall, 6
... Front combustion chamber, 7... Rear combustion chamber, 9... Detour part (stirring mixing zone), lO... Secondary combustion chamber, 12.
··Vent.

Claims (1)

[Claims] 1. In a waste incinerator boiler that has a gas descending passage that guides combustion gas downward from the upper end of the combustion chamber above the grate via a detour, a partition wall in the width direction is provided in the combustion chamber to separate the combustion chamber from the fire. It 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 the exhaust port at the upper end of the rear combustion chamber is opened opposite to the lower side of the detour that communicates with the front combustion chamber. A boiler for a garbage incinerator, characterized in that a descending passage is used as a secondary combustion chamber.