JP2564173Y2 - Air diffuser for fluidized bed incinerator - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diffuser tube of a fluidized bed incinerator, and more particularly to a diffuser tube capable of preventing the accumulation of incombustibles on the diffuser tube.

[0002]

2. Description of the Related Art There are two types of fluidized bed incinerators: an air diffuser type and an air diffuser type.

[0003] In the diffuser type, as shown in FIG. 7, a fluidized bed incinerator 1 is provided with a dust supply port 2 and a supply port 3 for supplying a fluid medium such as sand. A plurality of air diffusers 6 formed with a large number of ejection ports 5 along the longitudinal direction on both sides are horizontally arranged at intervals. This diffuser 6
Is connected at its end to the primary air supply header 7. An exhaust port H is formed above the furnace, and a secondary combustion air nozzle 8 is provided in a free board portion F of the furnace. On the other hand, a hopper-type incombustible material discharge port 9 is provided below the furnace, and a sand cooling pipe 10 for cooling the sand and incombustible material falling in the packed bed is provided above the incombustible substance discharge port 9. Can be Although not shown, an unloading machine is provided at the noncombustible material discharge port 9. The carry-out machine is provided with a classifier, and the classifier is provided with a circulation device so as to circulate the classified sand to a sand supply port.

As for the incinerated material, a fluid medium such as sand is supplied from a dust supply port 2 to a diffuser 6 through a supply port 3, and the fluid and the incinerated material are fluidized by primary air from the diffuser 6. Then, the combustibles in the incinerated material are burned. A part of the combustible material in the fluidized bed becomes combustible gas, is burned by the secondary air from the secondary air nozzle 8 in the freeboard section F, and is exhausted from the exhaust port H above the furnace. At the bottom of the air diffuser 6,
A packed bed is formed by the fluid medium descending through the gaps between the diffuser tubes 6 and the non-combustible material in the incinerated material, and is discharged from the non-combustible material discharge port 9 and carried out of the furnace by the unloader. The sand is classified by a classifier, circulated to the sand supply pipe 3 by a circulation device, and the incombustibles are collected outside the furnace.

[0005]

By the way, in the fluidized bed incinerator 1 described above, if the operation is performed with the minimum amount of fluidized air required for fluidization, the incineration material supplied from the dust supply port 2 can be removed. Non-combustible materials such as metal pieces such as wires and cans and debris etc. contained therein do not fall through the gaps between the diffuser tubes 6 and accumulate over one or more diffuser tubes 6. There is. If incombustibles accumulate on the air diffuser 6, fluidization is hindered, and a good combustion state of the incinerator cannot be maintained, and long-term continuous operation cannot be performed. For this reason, conventionally, the amount of fluidizing air (primary air) supplied to the air diffuser 6 is unavoidably set to about 1.5 times the minimum amount of air necessary for fluidizing, and the fluidizing state is increased. Although the incombustibles are prevented from accumulating on the trachea 6, they are not completely prevented, and the operation is often stopped. In addition, when the supply amount of the primary air from the air diffuser 6 increases, fluidization of the fluidized bed becomes intense, local combustion proceeds, and the amount of secondary air decreases, so that good combustion can be maintained. There was no problem.

On the other hand, in a diffuser plate type fluidized bed incinerator, accumulation of incombustible materials on the diffuser plate is inevitable.
For example, as disclosed in Japanese Utility Model Application Laid-Open No. 60-83895, a rotating arm for removing incombustible substances is provided on a diffuser plate, and the non-combustible substances accumulated on the diffuser plate are removed by the rotating arm outside the furnace. Although discharge is performed, it is not preferable to provide a mechanical movable member on the diffuser plate. For this reason, Japanese Patent Application Laid-Open No. 63-271
As in 016, the hearth is inclined from the furnace wall toward the center of the furnace, and incombustibles deposited on the hearth are moved along the inclination and discharged out of the furnace. However, since the fluidized state is not uniform when the hearth is inclined, the lower surface of the inclined diffuser plate is partitioned by a plurality of wind boxes, and the amount of fluidizing air supplied to each wind box is changed to make the fluidized bed uniform. However, there is a problem that the structure becomes complicated.

Therefore, an object of the present invention is to solve the above-mentioned problems and form a good fluidized bed with a horizontally arranged diffuser,
In addition, it is an object of the present invention to provide an air diffuser for a fluidized bed incinerator that can prevent non-combustible substances from being deposited on the air diffuser.

[0008]

In order to achieve the above-mentioned object, the present invention comprises a tubular body, which is horizontally arranged at a plurality of intervals in a lower part in an incinerator and is disposed in a longitudinal direction on both sides of the tubular body. A large number of jet ports are formed along the diffuser pipe of the fluidized bed incinerator for fluidizing the fluid medium supplied above the pipe body. Incombustible material is provided so as to penetrate toward the furnace wall or from one furnace wall to the other furnace wall, and between the opposite end portions of the tubular body or between the distal end of the tubular body and the other furnace wall. A sliding member which forms a falling port and is provided upright on the upper surface of the tube body, the height of which gradually decreases from the furnace wall to the tip. Further, the sliding member is formed in a hollow shape and communicates with the tube, and is provided with an ejection port at a tip of the sliding member.

[0009]

According to the above construction, even if the incombustible material straddles over the diffuser tube, the incombustible material slides on the sliding member and moves to the tip side, and the diffuser tube and the furnace wall or other diffuser are moved. The trachea can be lowered through the drop openings at the ends thereof, preventing accumulation of incombustibles and maintaining good combustion.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The overall structure of the fluidized bed incinerator 1 is the same as that of the conventional example as shown in FIG.

FIGS. 1 and 2 (a) and 2 (b) show an embodiment of the air diffuser 6 according to the present invention. The air diffuser 6 is formed from the tube 4, and is formed by forming a number of ejection ports 5 along the longitudinal direction on both sides of the tube 4. A rectangular mounting flange 11 is provided on the mounting portion side of the tube 4,
Is provided on the upper surface of the sliding member 14 such that the height gradually decreases from the mounting portion side to the tip. The sliding member 14 includes a mounting parallel portion 13 near the mounting flange 11 and an inclined portion 12 inclined from the mounting parallel portion 13 to the tip. The sliding member 14 is formed in a hollow shape, and a communication port 21 is provided near the mounting flange 11 of the tube 4 so as to communicate with the tube 4.
Is provided with a jet port 23. In addition, a connection flange 15 is provided at an end of the diffuser 6 on the side of the attachment portion of the tube 4.

As shown in FIG. 3, the diffuser 6 is connected to the other furnace walls 17, 1 from the opposite furnace walls 16, 17 of the incinerator 1.
6, the mounting parallel portion 13 of the sliding member 14 is attached to the furnace wall 1.
The mounting flange 11 is penetrated so as to be located at positions 6 and 17, and the mounting flange 11 is bolted to the flange 18 outside the furnace wall. The diffuser tubes 6 are arranged in the furnace such that the diffuser tubes 6 are parallel to each other and face each other, and a non-combustible substance drop port 19 having a fixed gap is formed at the tip of the opposed diffuser tubes 6. It is provided as follows. The connection flange 15 of the air diffuser 6 is bolted to the header side flange 20 and connected to the primary air supply header 7.

Next, the operation of the embodiment will be described.

As shown in FIG. 3, a fluidized medium and a substance to be incinerated are supplied on the air diffuser 6 to form a fluidized bed, and combustibles in the substance to be incinerated are burned. In addition, the incombustibles in the fluid medium and the incinerated material descend in the packed bed through the gap between the diffuser pipes 6, but the wire that is to be straddled on the diffuser pipes 6,
A non-combustible material such as a metal piece such as a can and debris rolls or slides on the inclined portion 12 of the sliding member 14 provided in the air diffuser 6 to a non-combustible material drop port 19 formed by the tips of the air diffuser 6. It is moved and descends through the drop 19. Further, since the incombustible drop 19 is formed over the entire width of the furnace, a long incombustible also descends through the drop 19. Thereby, good combustion is maintained. Also, as shown in FIG. 1, primary air is introduced into the sliding member 14 from an ejection port 21 near an attachment portion of the tube 4,
Since the gas flows through the jet port 23 provided at the distal end portion 22 of the sliding member 14, the sliding member 14 is cooled, so that it is protected from oxidation and high-temperature corrosion.

Further, since only the amount of primary air supplied to the air diffuser 6 is necessary for fluidization, local combustion does not occur in the fluidized bed and secondary air for burning combustible gas is sufficient. , A good combustion state is maintained.

FIG. 4 shows another embodiment of the present invention. In place of the hollow sliding member 14 shown in FIGS. 1 and 2 (a) and 2 (b), a furnace wall is provided on the tube 4. Plate-shaped sliding member 2 made of a material that withstands high-temperature oxidation and high-temperature corrosion of a ceramic or the like having an inclined portion 25 whose height gradually decreases from the top to the tip.
6 is provided. The sliding member 26 includes a mounting parallel portion 24 and an inclined portion 25 that is inclined from the mounting parallel portion 24 toward the tip.

In the embodiment shown in FIG. 4, since the sliding member 26 is formed of a heat-resistant material, there is no need to supply cooling air.

FIG. 5 shows still another embodiment, in which a sliding member 27 formed in the air diffusion tube 6 and a tube member 4 are formed.
Are formed so as to be integrated. The sliding member 27 has a mounting parallel portion 28 and an inclined portion 29 inclined from the mounting parallel portion 28 toward the tip.

In the embodiment of FIG. 5, the sliding member 27 is
Because it is cooled by the primary air supplied to the tube 4,
There is no need to provide a cooling port in the tube 4.

FIG. 6 shows an example of the installation of the diffuser tube according to the present invention, in which the diffuser tube 6 is moved from one furnace wall 16 to the other furnace wall 17.
And is disposed in parallel in the furnace so as to form a nonflammable substance drop port 19 between the tip end thereof and the other furnace wall 17. In this example, the diffuser 6 is provided so as to penetrate only from one of the furnace walls 16, so that the furnace is used for a relatively small one. Further, the air diffuser 6 may use any of FIGS.

[0022]

[Effects of the Invention] In summary, according to the present invention, the following excellent effects are exhibited.

(1) The incombustible material falling on the diffuser pipe slides on the sliding member provided on the diffuser pipe and descends through the incombustible substance drop port at the tip, so that the incombustible substance accumulates on the diffuser pipe. Can be prevented and the incinerator can be operated continuously for a long period of time.

(2) Since the incombustible drop at the tip of the diffuser tube is formed over the entire width of the furnace, a long incombustible also slides on the sliding member and descends through this drop. Since the accumulation of incombustibles can be prevented, long-term continuous operation of the incinerator is possible.

(3) The sliding member formed in the hollow is cooled by the primary air and protected from oxidation and high-temperature corrosion.

(4) Since the amount of primary air supplied to the diffuser is only required for fluidization, local combustion does not occur in the fluidized bed, and secondary air for burning combustible gas is sufficient. , A good combustion state is maintained.

(5) In order to form a fluidized bed with a constant layer thickness, there is no need to provide a device or the like for adjusting the amount of primary air supplied to each air diffuser, so that economic efficiency is high.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an embodiment of the present invention.

FIG. 2 is a front view and a side view of the air diffusion tube of FIG. 1;

FIG. 3 is a side view showing an example of attachment of the diffuser tube of FIG. 1;

FIG. 4 is a perspective view showing another embodiment of the present invention.

FIG. 5 is a perspective view showing still another embodiment of the present invention.

FIG. 6 is a side view showing another example of installation of the diffuser according to the present invention.

FIG. 7 is a side view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Fluid-bed incinerator 4 Tube 5 Spout port 6 Air diffuser 14 Sliding member 16, 17 Furnace wall 26 Sliding member 27 Sliding member

Claims (2)

(57) [Scope of request for utility model registration] 1. An incinerator comprising a plurality of pipes which are horizontally arranged at a plurality of intervals at a lower portion in an incinerator, and which have a plurality of ejection ports formed along a longitudinal direction on both sides of the pipe. In a diffuser pipe of a fluidized bed incinerator for fluidizing the supplied fluid medium, the pipe body is penetrated from the furnace wall to the other furnace wall in the incinerator, or from one furnace wall. A non-combustible material drop port is formed so as to penetrate toward the other furnace wall, and between the end portions of the opposed tube bodies or between the tip of the tube body and the other furnace wall, and the furnace wall is provided on the upper surface of the tube body. A diffuser pipe of a fluidized bed incinerator, characterized in that a sliding member having a height gradually decreasing from an end to a tip is provided. 2. The air diffusion tube of a fluidized bed incinerator according to claim 1, wherein the sliding member is formed in a hollow shape, is communicated with the pipe, and is provided with an injection port at a tip of the sliding member.