JP3136580B2 - Fluidized bed diffuser - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluidized-bed diffuser used in a pressurized fluidized-bed boiler or the like.

[0002]

2. Description of the Related Art A conventional diffuser for a fluidized bed of this type has a structure as shown in FIG. In FIG. 3, 11 and 12 are furnace walls, 13 is a support member provided on the furnace wall 11, 14 is a diffuser tube support column inlet header provided on the furnace wall 12, and 15 is provided on the header 14. Bearing member, 16 is an air diffuser body, 17 is an air nozzle, 18 is a main duct, 19 is an air supply duct, 20 is an inlet mother pipe, 21 is an expansion joint, and 22 is the air supply duct 19.
The labyrinth seal 23 provided in the middle of the above is a fixing bolt for fastening the air diffuser tube body 16 to the support member 15.

That is, in the prior art, an expansion joint 21 and a labyrinth seal 22 are used near the diffuser tube support column inlet header 14 in order to absorb the thermal expansion of the diffuser tube bodies 16 and 16 and the inlet mother pipe 20. ing.

[0004]

However, according to the prior art shown in FIG. 3, if the air diffuser tubes 16 and 16 and the inlet mother tube 20 are thermally deformed, the labyrinth seal 2 is not provided.
2, there is a problem that the combustion air leaks, and furthermore, the expansion joint 21 is damaged and the air leaks, causing erosion in the surroundings.

[0005] The present invention is to solve the above problems. That is, an object of the present invention is to provide a fluidized-bed diffuser in which air leakage or erosion is prevented from occurring even when the diffuser tube main body or the like is thermally deformed.

[0006]

In order to achieve the above object, the present invention provides a diffuser tube supported by a support member provided on a furnace wall and a support member provided on a diffuser tube support column inlet header. In the fluidized bed diffuser having a main body and an air supply duct for supplying air from the main duct to the diffuser main body, the air supply duct expands and contracts in a vertical direction following thermal deformation of the diffuser main body. And the support structure of the diffuser tube main body by the support member and the support member is a slide support.

[0007]

According to the present invention, the diffuser tube body supported by the support member provided on the furnace wall and the support member provided on the diffuser tube support column inlet header, and air is supplied from the main duct to the diffuser tube body. And an air supply duct for supplying air.The air supply duct has a bellows that expands and contracts in a vertical direction following thermal deformation of the air diffuser main body, and the support member and a support member. Since the support structure of the diffuser tube body by the member is a slide support, there is no conventional fixing bolt and expansion joint, the diffuser tube body becomes an integral type, good sealing performance,
Movement due to thermal deformation is free up and down, and the amount of displacement is absorbed by the bellows, and left and right deformation is absorbed by the slide support.

[0008]

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, 1 and 2 are furnace walls, 3 is a support member provided on the furnace wall 1, 4 is a diffuser tube support column inlet header provided on the furnace wall 2, and 5 is provided on the header 4. Bearing member, 6
Is an air diffuser body, 7 is an air nozzle, 8 is a main duct, 9 is an air supply duct for supplying air from the main duct 8 to the air diffuser body 6, and 10 is a bellows provided in the middle of the air supply duct 9. is there.

That is, in the first embodiment, the fixing bolt 23 and the expansion joint 21 shown in FIG.
The bellows 10 is adopted without the labyrinth seal 22, and the diffuser tube body 6 is made integral. The support structure of the diffuser tube main body 6 by the support member 3 and the support member 5 is a slide support (mounting support).

Therefore, in the diffuser tube of the fluidized bed shown in FIG. 1, the thermal deformation of the diffuser tube body 6 is deformed as shown by a two-dot chain line. The amount is absorbed by the bellows 10, and the left and right deformations are absorbed by sliding on the upper surface of the support member 3.

FIG. 2 shows a second embodiment of the present invention.
In this second embodiment, the upper end of the bellows 10 is fixed to the diffuser tube support column inlet header 4, and the lower end is fixed to a relatively lower part of the air duct 9. Further, the lower end of the air supply duct 9 is inserted into the main duct 8 and is engaged slidably up and down. The other parts are the same as in the first embodiment.

In the second embodiment, the air diffuser body 6
When the air supply duct 9 is displaced upward (lifted) due to thermal deformation of the bellows, the bellows 10 contracts accordingly. In the second embodiment, since the bellows 10 is provided outside the air supply duct 9, the bellows 10 can be provided in a narrow place without affecting the length of the duct 9, and the bed material is scattered. After falling into the trachea body 6, the duct 9
Even if it does, the bellows 10 is not affected by the bed material.

[0013]

As described above, according to the present invention,
It has a diffuser tube main body supported by a support member provided on the furnace wall and a support member provided on the diffuser tube support column inlet header, and an air supply duct for supplying air from the main duct to the diffuser tube main body. In the diffuser tube of the fluidized bed, the air supply duct includes a bellows that expands and contracts in the vertical direction following thermal deformation of the diffuser tube main body, and a support structure of the diffuser tube main body by the support member and the support member Is a slide support, so that the sealing performance is good, the movement due to thermal deformation is free up and down, and the bellows absorbs the displacement, and the left and right deformation is absorbed by the slide support. Therefore,
Even if the main body of the diffuser tube is thermally deformed, no air leakage or erosion occurs.

[Brief description of the drawings]

FIG. 1 is a partial cross-sectional front view showing a first embodiment of the present invention.

FIG. 2 is a partial sectional front view showing a second embodiment of the present invention.

FIG. 3 is a partial cross-sectional front view showing an example of a conventional technique.

[Description of Signs] 1 Furnace wall 2 Furnace wall 3 Support member 4 Air diffuser tube support column entrance header 5 Support member 6 Air diffuser main body 8 Main duct 9 Air supply duct 10 Bellows

Claims (3)

(57) [Claims] 1. A diffuser tube body supported by a support member provided on a furnace wall and a support member provided on a diffuser tube support column inlet header, and a feeder for supplying air from the main duct to the diffuser tube body. In the diffuser pipe of a fluidized bed having an air duct, the air supply duct includes a bellows that expands and contracts in a vertical direction following thermal deformation of the diffuser pipe main body, and the diffusion by the support member and the support member. A fluidized bed diffuser, wherein the support structure of the trachea body is a slide support. 2. A diffuser pipe for a fluidized bed according to claim 1, wherein the bellows is provided in the air duct. 3. A diffuser tube for a fluidized bed according to claim 1, wherein an upper end of the bellows is fixed to the diffuser tube support column inlet header, and a lower end is fixed to a relatively lower outside of the air duct.