JPS6069412A - Fluidized-bed combustion device - Google Patents

Abstract

PURPOSE:To prevent dropping of partcle during stoppage of operation, by a method wherein a nozzle, having a wire net for preventing dropping particle stretched to the upper end side thereof, is disposed in nozzle holes in a grating base plate, and a cap in disposed at a given distance away from and above the nozzle hole. CONSTITUTION:A nozzle 4, having a wire net 6 for preventing dropping of particle which is stretched to the upper end side, is disposed in a nozzle hole 2 in a grating base plate 1, and a cap 5, formed in the shape of a cylinder with a bottom and having its cylinder size larger than the size of the nozzle 4, is disposed at a given distance away from and above the nozzle 4. This enables particle to be prevented from entrance during the stoppage of operation with the aid of the wire net 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in a fluidized bed combustion device that can be applied to all products using fluidized beds, such as blast furnace fluidized bed reactors and cement manufacturing machines.

The particles are fluidized in a fluidized bed using whole air or gas as a fluidizing agent for combustion and heat exchange, but conventional perforated plates have the following problems.

That is, as a perforated plate structure, as shown in FIG. 1 (a), a nozzle hole (2) is opened in the perforated plate base il+ to eject a fluid medium (3) to fully fluidize the fluid agent (7). However, in this case, the particles (8) fall when the machine stops, as shown in Figure 1 (portion).

In order to prevent the particles (8) from falling when stopped, currently the nozzle (4) is
Although the cap (5) can be removed from the top, due to pressure fluctuations when the machine is stopped, particles (9) fall, albeit in a small amount, as shown in Figure 2 (opening).

The present invention has been made in order to completely solve the problems of the prior art, and uses simple means to completely prevent the flow agent from falling and prevent troubles caused by falling particles. The purpose is to provide a new fluidized bed combustion device.

In order to achieve this object, the fluidized bed combustion apparatus of the present invention includes a nozzle attached to a nozzle hole of a perforated plate base, a wire mesh attached to an upper end opening of the nozzle, and a wire mesh disposed above the nozzle. It is characterized by comprising a cap.

The details of the present invention will be explained below with reference to the drawings.The same reference numerals will be used for the same components as those of the conventional fluidized bed combustion apparatus.

As shown in FIG. 3, a nozzle (4) with a wire mesh (6) for preventing particles falling is installed on the upper end side of the nozzle hole (2) of the perforated base +11, and the nozzle (4) Caps (5) are disposed above the caps at regular intervals.

That is, the cap (5) has a cylindrical shape with a bottom, the diameter of which is larger than the diameter of the nozzle (4), and the upper edge of the nozzle (4) is located in the inner cavity of the cap (5). and the cap (
The cylindrical portion of 5) is arranged to surround the nozzle (4),
A distance of e is provided between the inner circumferential surface of the cylindrical portion of the camp (5) and the outer circumferential surface of the nozzle (4), and the cap (5)
A space is also provided between the ceiling of the nozzle (4) and the nozzle (4). The mesh of the wire mesh (6) for preventing particles from falling has particles (8
), of course. Note that the wire mesh (6) for preventing particles from falling may be replaced with a fully perforated iron plate.

As shown in Fig. 3 (o), when the machine is stopped, the particles (8) that come in from the gap between the cap (5) and the nozzle (4) due to the pressure fluctuation during the stop are prevented from falling. It is caught by the wire mesh (6) and is prevented from falling downward from the perforated plate base (1) from the nozzle hole (2).

When restarting, as shown in FIG. 3(a), the flow velocity inside the nozzle (4) is high due to jetting out the fluid medium +31k from the bottom of the nozzle (4), so the drop prevention The particles (8) that were caught in the wire mesh (6) return to the fluidized bed circle.

As described above, the fluidized bed combustion apparatus of the present invention includes a nozzle attached to the nozzle hole of the perforated plate base, a wire mesh attached to the upper end opening of the nozzle, and a cap disposed above the nozzle. Because particles do not fall from the nozzle when the operation is stopped, clogging due to falling particles can be prevented, the falling particle barge line can be eliminated, and the fluidizing medium piping system can be simplified. It has the advantage of being able to

[Brief explanation of the drawing]

(a) and (b) in Figure 1 and (a) and (b) in Figure 2 are cross-sectional views of a conventional fluidized bed combustion apparatus when it is in operation and when it is stopped, respectively.
Figures (a) and (b) are cross-sectional views of the fluidized bed combustion apparatus of the present invention when it is in operation and when it is stopped, respectively. (1)... Perforated plate base, (2)... Nozzle hole, (3)...
Fluid i body, +4)...nozzle, (5)...cap, (
6)...Metal vice, (7)...Glidant, (8)...Particles. Figure 1 Figure 2I (B) (0) Figure 3 (A) (O)

Claims (1)

[Claims] A fluidized bed combustion apparatus comprising: a nozzle attached to a nozzle hole of a perforated plate base; a wire mesh attached to an upper end opening of the nozzle; and a cap disposed above the nozzle.