JP3160870B2 - Wind box in fluidized bed - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind box in a fluidized bed, and more particularly, to supplying a fluidized working gas such as air to a number of dispersion nozzles provided at the bottom of a fluidized chamber such as a fluidized bed boiler. It is related to a wind box.

[0002]

2. Description of the Related Art A wind box in a conventional fluidized-bed boiler has, for example, a structure as shown in FIG. In FIG. 5, 11 is a wind box, 12 is an inlet duct, 13 is a flow chamber, 14 is the bottom of the flow chamber 13, and 15 is a number of air distribution nozzles provided on the bottom 14.

[0003] That is, the wind box 11 flows in the flowing air from the inlet duct 12 and supplies it to the air distribution nozzle 15.

[0004]

However, in the conventional wind box 11 shown in FIG.
1, the inlet duct 12 which is a narrow flow path
The flow velocity distribution is indicated by the arrow A
As shown by, the central part is early and the corner part is late.
Further, inside the flow chamber 13, the bed material has a downward flow as shown by the arrow B at the corner.

[0005] Therefore, the air distribution nozzle 1 at the corner portion
Bed material gets into 5 and clogging occurs, wind box 1
Evils such as bed material falling into the inside of 1 occur,
Eventually, there was a problem that it was difficult to continue the boiler operation.

[0006] The present invention is intended to solve the above problems. That is, the present invention can make the flow velocity of the fluidized working gas to the dispersion nozzle uniform,
No clogging of the dispersion nozzle at the corner, and
It is an object of the present invention to provide a wind box in a fluidized bed in which bed material does not fall into the wind box.

[0007]

In order to achieve the above object, according to the present invention, a fluidized working gas is supplied from an inlet duct to a plurality of dispersion nozzles provided at the bottom of the flow chamber. A baffle body provided inside the wind box to partially change the flow direction of the fluidized working gas near the inlet duct to equalize the flow velocity to each of the dispersion nozzles. The baffle body is provided in a shape such that a fluidized working gas flow flowing from the inlet duct is received at a right angle to the plate surface in a circular plate, or a conical body having a top directed toward the inlet duct, or a spherical surface. Is a hemisphere facing the inlet duct.

[0008]

According to the present invention, there is provided a wind box in which fluidized working gas flows from an inlet duct and supplies the working gas to a large number of dispersion nozzles provided at the bottom of the flow chamber. Since the baffle body is provided to uniformly change the flow direction of the fluidizing working gas near the inlet duct to make the flow velocity to each of the dispersion nozzles uniform, the flow to the dispersion nozzle at the corner portion is provided. As a result, the flow rate of the chemical working gas is ensured, so that the conventional adverse effects do not occur.

[0009]

FIG. 1 shows a first embodiment of the present invention. In FIG. 1, 1 is a wind box, 2 is an inlet duct, 3 is a flow chamber,
Reference numeral 4 denotes the bottom of the flow chamber 3, 5 denotes a number of dispersion nozzles provided on the bottom 4, 6 denotes a disk provided as a baffle inside the wind box 2, and 7 denotes the disk 6. It is a pillar.

FIG. 2 is a plan view of the disk 6 of FIG.
Has a cross-shaped reinforcing rib 8. The disk 6 is installed so as to receive a fluidized working gas flow flowing from the inlet duct 2 into the wind box 1 at a right angle on the plate surface (lower surface). In other words, the disk 6 partially changes the flow direction of the fluidized working gas near the inlet duct 2 and
It is installed so as to make the flow velocity to the uniform.

In the wind box 1 configured as shown in FIG. 1, a disk 6 as a baffle body is provided inside the wind box 1, so that the disk 6 is located at the center near the inlet duct 2. Since the flow direction of the fluidized working gas in the section is changed to equalize the flow velocity to each of the dispersing nozzles 5, the unbalance as in the prior art is eliminated, and the flow rate of the fluidized working gas to the dispersing nozzle 5 in the corner portion is secured. Therefore, adverse effects such as clogging of the dispersion nozzle 5 at the corner and dropping of the bed material into the wind box 1 do not occur.

FIG. 3 shows a second embodiment of the present invention.
In this second embodiment, the baffle consists of a hollow cone 9 with the top directed towards the inlet duct 2. That is, it acts similarly to the disk 6, but is slightly more complex in structure than the disk 6, but has less energy loss to change the direction of the fluidized working gas.

FIG. 4 shows a third embodiment of the present invention.
In the third embodiment, the baffle is composed of a hollow hemisphere 10 whose spherical surface is directed toward the inlet duct 2. This hemisphere 10 is the same as the above-mentioned cone 9.

[0014]

As described above, according to the present invention,
In a wind box for supplying the working gas to a number of dispersion nozzles provided at the bottom of the flow chamber by flowing the fluidized working gas from the inlet duct, provided in the wind box, near the inlet duct Since the baffle body is provided to partially change the flow direction of the fluidized working gas to uniform the flow velocity to each of the dispersion nozzles, the flow rate of the fluidized working gas to the dispersion nozzle at the corner portion is ensured. Therefore, the bed material does not enter the dispersion nozzle at that portion, and there is no adverse effect such as the bed material falling into the inside of the wind box, and a stable fluidized bed can be continued.

[Brief description of the drawings]

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

FIG. 2 is a plan view showing the disk of FIG. 1;

FIG. 3 is a front sectional view showing a second embodiment of the present invention.

FIG. 4 is a front sectional view showing a third embodiment of the present invention.

FIG. 5 is a front sectional view showing an example of a conventional technique.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Wind box 2 Inlet duct 3 Flow chamber 4 Bottom part 5 Dispersion nozzle 6 Disk 9 Cone 10 Hemisphere

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-63-290307 (JP, A) JP-A-49-29281 (JP, A) JP-A-62-206309 (JP, A) (58) Field (Int.Cl. ⁷ , DB name) F23C 10/18 F23G 5/30

Claims (4)

(57) [Claims] 1. A wind box for flowing fluidized working gas from an inlet duct and supplying the working gas to a plurality of dispersion nozzles provided at the bottom of the flow chamber, wherein the working gas is provided inside the wind box. A baffle body for partially changing the flow direction of the fluidized working gas near the inlet duct to equalize the flow velocity to each of the dispersion nozzles ;
Receiving the fluidized working gas flow flowing from the plate at right angles to the plate surface
A wind box in a fluidized bed, characterized in that the wind box is made of a circular plate . 2. The disk has a suitable number of small through holes in a part of the disk.
The wind box in the fluidized bed according to claim 1. 3. A fluidized working gas flows from an inlet duct.
To the many dispersion nozzles provided at the bottom of the flow chamber.
Air box for supplying the working gas of
And the flow of the fluidized working gas in the vicinity of the inlet duct.
The direction of flow is partially changed to equalize the flow rate to each of the dispersion nozzles.
A baffle body that is integrated with the baffle body.
Characterized by a cone facing the mouth duct
A wind box in a fluidized bed. 4. A fluidized working gas flows from an inlet duct.
To the many dispersion nozzles provided at the bottom of the flow chamber.
Air box for supplying the working gas of
The flow of the fluidized working gas near the inlet duct.
The direction of flow is partially changed to equalize the flow rate to each of the dispersion nozzles.
And a baffle body for integrating the spherical surface.
Characterized by a hemisphere facing the mouth duct
A wind box in a fluidized bed.