JPH04356608A - Blowing-in device of secondary combustion air for refuse incinerator - Google Patents

Abstract

PURPOSE:To present a secondary combustion air blowing-in device which is capable of reducing the volume of secondary combustion air that is blown in for an incinerator of city refuses, etc., and provide full recombustion of unburned gases. CONSTITUTION:A secondary combustion air blowing-in device A that is provided in connection with the gas outlet section in the upper section of the first combustion chamber of a refuse incinerator is provided with an air supply chamber 1 that has a circular inner circumferential wall 11 that forms a circular air blowing-in chamber 2 in the center by collecting above mentioned gas outlet sections in a cylindrical form and nozzles 3 that are arranged on the whole circumference of the circular inner circumferential wall 11 of the air supply chamber 1 and at the same time tangential to a concentric circle 12a with a diameter smaller than the inside diameter of the air blowing-in chamber, inclining in the same direction, and projecting.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a secondary combustion air blowing device for re-combusting unburned gas in an incinerator that primarily incinerates municipal waste using a small amount of air.

0002

[Prior Art] In conventional incinerators for municipal waste, etc., unburned gas emitted during garbage incineration is said to cause the generation of dioxins that pollute the natural environment.
Particularly when the amount of gas at startup is small, a large amount of unburned gas is generated, so air is blown into the outlet of the primary combustion chamber to reburn the unburned gas coming out of the primary combustion chamber.

0003

[Problems to be Solved by the Invention] However, conventionally, incinerators equipped with multiple stages of stokers are formed into a substantially rectangular shape. Since the air was blown into the air blowing chamber, there was a problem in that the corners became blind spots and the air did not mix well with unburned gas, reducing combustion efficiency. In addition, in the case of municipal waste, the residual oxygen concentration in the exhaust gas emitted from this type of waste incinerator is 12
%, and simply supplying a large amount of air to eliminate unburned gas will exceed the regulatory value for residual oxygen concentration.
In addition, there was a problem in that the temperature drop caused by the large amount of air further reduced the secondary combustion efficiency. The present invention was made in order to solve such conventional problems, and its purpose is to re-combust a waste incinerator by re-combusting unburned gas with a small amount of air supply. An object of the present invention is to provide an air blowing device.

0004

[Means for Solving the Problem] As a means for achieving the above-mentioned object, the air blowing device for a waste incinerator of the present invention includes an air blowing device that is connected to a gas outlet section in the upper part of the primary combustion chamber of the waste incinerator. An air blowing device for secondary combustion comprising: an air supply chamber having a circular inner circumferential wall in which the gas outlet portions are assembled in a cylindrical shape to form an air blowing chamber in the center; The air blowing chamber is arranged around the entire circumference of the circular inner circumferential wall of the air supply chamber, and the air injection direction is inclined in the same direction tangent to a concentric circle with a small diameter set in the air blowing chamber. The configuration includes a nozzle and;

[0005]

[Operation] In the secondary combustion air blowing device of the present invention, the gas outlet section at the upper part of the primary combustion chamber is gathered into a cylindrical shape by the circular inner circumferential wall of the air supply chamber arranged at the upper part of the primary combustion chamber of the garbage incinerator. It is equipped with a shaped air blowing chamber. Therefore, the gas in the primary combustion chamber is collected in a cylindrical shape at the gas outlet and passes through the air blowing chamber. In this air blowing chamber, air is blown from the air supply chamber into the same direction on concentric circles within the air blowing chamber by a nozzle. Since this air blowing chamber is formed in a circular shape, the blown air causes a swirling flow in the combustion gas. This blown air has no blind spots in the air blowing chamber, so it is mixed well with the combustion gas and the unburned gas is sufficiently combusted. For this reason, only a small amount of air is needed to blow in, which allows for efficient combustion without lowering the gas temperature.
The residual oxygen concentration in exhaust gas can be lowered to within regulatory limits.

[0006]

Embodiments Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 is a cross-sectional view showing the secondary combustion air blowing device of this embodiment, and FIG. 2 is an explanatory view showing the installation state of the same.
FIG. 3 is an explanatory diagram showing how the nozzle is installed, and FIG. 4 is an explanatory diagram showing the entire garbage incinerator. A secondary combustion air blowing device A for a garbage incinerator according to this embodiment mainly includes an air supply chamber 1, an air blowing chamber 2, and a nozzle 3. The air supply chamber 1 stores combustion gas 41 containing unburned gas generated by burning municipal waste in the primary combustion chamber 40 of the waste incinerator 4.
As shown in FIG. 1, a substantially rectangular sealed body 10 has a circular inner circumferential wall 11 in the center thereof. 1
An opening 1 for forming an air blowing chamber that penetrates vertically by 1.
It has 2. As shown in FIG. 2, the air blowing chamber forming opening 12 forms the air blowing chamber 2 with a refractory material 13 stretched on its inner surface, and also connects the gas outlet portion 42 at the upper part of the primary combustion chamber 40. The set size of the gas outlet section 42 allows the refractory material 13 to be assembled into a cylindrical shape and connected integrally.
It is formed larger by the thickness of . Note that a secondary combustion chamber 43 is integrally connected above the air blowing chamber 2 formed by the closed body 10. Further, in the circular inner peripheral wall 11 of the air blowing chamber forming opening 12, a large number of cylindrical bodies 14 for inserting the nozzles 3 are arranged over the entire circumference, penetrating at equal pitches in two places, upper and lower. ,
The air is fixed so that its jet direction 3a touches a concentric circle 12a inside the air blowing chamber 2, which is set to have a diameter approximately half the diameter of the circular inner circumferential wall 11, and is inclined in the same direction. In the figure, 14a is a protrusion for preventing the nozzle 3 from coming off, which is slightly protruded into the cylindrical body, and 14b is a stopper for inserting the same.

The blowing chamber 2 forms the combustion gas 41 of the primary combustion chamber 40 into a cylindrical shape, and is formed into a circular shape by covering the circular inner circumferential wall 11 with a refractory material 13. It is smoothly connected to the gas outlet section 42. In the figure, 20 is an opening in front of the cylindrical body 14 provided in the refractory material 13.

The nozzle 3 swirls the combustion gas 41 discharged from the primary combustion chamber 40 in the air blowing chamber 2, and burns unburned gas contained in the primary combustion gas 41 in the secondary combustion chamber 43. As shown in FIG. 3, the rear end is removably inserted into the cylindrical body 14, and the nozzle opening
0 is made of ceramic and has a length that faces the opening 20 provided in the refractory material 13. In the figure, reference numeral 31 indicates a protrusion for arranging the nozzle port 30 at the center of the opening 20, and is provided at two locations, upper and lower. Further, 32 is a stepped portion provided at the rear end;
Reference numeral 33 indicates a retaining protrusion 14a provided on the stepped portion 32.
This is a cutout groove for insertion. This nozzle 3 includes the cylindrical body 1
4, the blowing direction is the same as the concentric circle 1.
2a, and are oriented so as to be inclined in the same direction and in contact with each other.

[0009] The waste incinerator 4, as shown in FIG.
Three stokers 44a, 44b, 44 are installed inside the incinerator 4.
Although the primary combustion chamber 40 is formed in a substantially rectangular shape, the gas outlet section 42 provided above between the stokers 44a and 44b has a circular opening 12 for forming an air blowing chamber. Therefore, they are gathered in a cylindrical shape. In the figure, 45 is a garbage pit, 46 is a garbage input hopper, 47a is a garbage crane, 47b is a bucket, 48 is a dust supply device, 49a is a gas cooling chamber, and 49b is an air preheating section.

Reference numeral 5 denotes a device for discharging ash that settles in the combustion gas discharging channel, and includes a scraper 50 that is rotated on the floor by a geared motor.

Next, the operation of this embodiment will be explained. In this embodiment, the combustion gas 41 of the garbage burned in the primary combustion chamber 40 gathers in a cylindrical shape at the gas outlet portion 42 and passes through the air blowing chamber 2 . In the air blowing chamber 2, the air supplied from the air supply chamber 1 is supplied by the nozzle 3 from the entire circumference in the direction tangent to the concentric circle 12a inside the air blowing chamber 2, so that the combustion gas 41 is While swirling in the air blowing chamber 2, it is thoroughly mixed with air. Therefore, the unburned gas contained in the combustion gas 41 is sufficiently reburned in the secondary combustion chamber 43.

As explained above, in the secondary combustion air blowing device A of the garbage incinerator of this embodiment, since the supplied air swirls the combustion gas containing unburned gas, the air and the combustion The gas is sufficiently mixed and unburned gas can be reburned sufficiently. In addition, since the air blowing chamber 2 is connected to the gas outlet section 42 in a circular shape due to the circular inner circumferential wall 11, there is no blind spot in the gas passage, and therefore the air is averaged out as a whole. The mixing effect can be increased, and re-combustion can be achieved with a small amount of air. Furthermore, since the amount of air blown into the exhaust gas is small, the amount of oxygen remaining in the exhaust gas is reduced.

Further, since the nozzle 3 is formed to be detachable, it can be replaced with an optimal one depending on the usage condition of the waste incinerator 4. Furthermore, since it is made of ceramic, it has a long life even when exposed to high temperatures and is economical.

Although the embodiments of the present invention have been described above,
The specific configuration of the present invention is not limited to this embodiment, and the present invention includes any design changes that do not depart from the gist of the invention. For example, in the embodiment, the air supply chamber 1 has a substantially rectangular closed shape, but is not limited to this.
The shape can be arbitrarily set, even if it is cylindrical.

Further, in the embodiment, an incinerator equipped with three stokers has been described, but the incinerator is not limited to this, and the type of incinerator may be arbitrary, and the shape of the incinerator, such as the arrangement of the gas outlet portion 42, etc. Can be set arbitrarily.

Further, in the embodiment, the nozzle 3 is made of ceramics and is detachably inserted into the cylindrical body 14, but the material and shape of the nozzle 3 are not limited to this. , the mounting method can also be set arbitrarily.

[0017]

Effects of the Invention As explained above, in the secondary combustion air blowing device for a waste incinerator of the present invention, the combustion gas including unburned gas is swirled by the air blown into it. The gas can be mixed sufficiently with the blown air as a flow, and the unburned gas can be reburned sufficiently. In addition, since the air blowing chamber has a circular inner peripheral wall and is connected to the gas outlet part in a circular shape, there are no blind spots in the gas passage, and therefore the mixing effect of mixing the air evenly throughout is achieved. It is possible to achieve complete combustion with a small amount of air. Further, since the amount of air to be blown in is small, the amount of residual oxygen in the exhaust gas can be reduced to below the regulation value.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view showing a secondary combustion air blowing device according to an embodiment of the present invention.

FIG. 2 is an explanatory diagram showing the attached state of the same as above.

FIG. 3 is an explanatory diagram showing a state in which the nozzle is attached.

FIG. 4 is an explanatory diagram showing the entire garbage incinerator same as above.

[Explanation of symbols]

A Garbage incinerator air blowing device 1 Air supply chamber 2 Air blowing chamber 3 Nozzle 3a Nozzle air injection direction 4 Incinerator 10 Closed body 11 Circular inner wall 12a Concentric circle 12 Air blowing chamber forming opening (air Blowing room) 3
0 Nozzle port (nozzle) 40 Primary combustion chamber 41 Combustion gas 42 Gas outlet part

Claims (1)

[Claims] 1. An air blowing device for secondary combustion, which is installed in series with a gas outlet in the upper part of the primary combustion chamber of a waste incinerator, wherein the gas outlet is gathered in a cylindrical shape to blow air. an air supply chamber having a circular inner circumferential wall forming a blowing chamber in the center; an air blowing chamber formed in a circular shape; an air blowing chamber arranged around the entire circumference of the circular inner circumferential wall of the air supply chamber; Equipped with nozzles that are inclined in the same direction and protrude in contact with concentric circles of small diameter set in the blowing chamber, and the air blown into the air blowing chamber from the air supply chamber passes through the air blowing chamber. A secondary combustion air blowing device for a garbage incinerator, which is characterized by causing a swirling flow in the combustion gas.