JPS5944575A - Device for forming fluidized bed - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for forming a fluidized bed, and more particularly to an improvement of a fluidized bed forming apparatus having a rotating perforated plate with a membrane pattern.

The fluidized bed formed by fluidizing media such as sand and ceramic balls can be used as a combustion furnace to burn flame-retardant materials well.
In addition, it has recently received a lot of attention as a reaction device for various substances. Various methods have been proposed for forming this fluidized bed, but the inventors formed a perforated plate placed at the bottom of the fluidized bed in a substantially hollow shape, and formed a large number of small holes in the tangential direction between the walls of the perforated plate. We previously proposed a fluidized bed using a rotating perforated plate with holes. 1 to 41Δ show this rotating perforated plate and the fluidized bed provided with this perforated plate. In the figure, 1 is the main body of the fluidized bed forming apparatus i1i, 3 is a rotating perforated plate formed at the bottom of the main body, and 4 is a jet nozzle connected to the center of the rotating perforated plate 3. In this type of device, the fluidizing gases G1 and G2 flowing into the wind box 5 flow into the bed through the small holes 8 and the jet nozzle 4 formed in the swirling perforated plate 3, respectively, and the gases injected from the small holes 8 flow into the bed. q1 forms a swirling flow, and the gas G2 injected from the jet nozzle 4 forms an upward flow, and the fluidized bed 2 as a whole exhibits a complicated behavior. When used, it is possible to mix and stir substances such as the following:

Although this fluidized bed using a rotating perforated plate has advantages such as "double bed", it has the following problems. In other words, when manufacturing a perforated plate, first a steel plate is formed into a funnel shape, and then a fourth
As shown in the figure, a small hole is drilled in the tangential direction of this leakage SI-shaped wall surface at a certain angle θ, but it is extremely difficult to drill a small hole in the tangential direction, and the number of small holes is Since there were a large number of perforated plates, a great deal of effort was required to manufacture the perforated plate. Furthermore, this type of rotating perforated plate has relatively low strength against thermal expansion and thermal deformation, and there is also the problem that it is difficult to manufacture a large-sized rotating perforated plate.

In order to eliminate these drawbacks, the inventors further provided a rotating perforated plate having a membrane structure (Japanese Patent Application No. 55-1
358'7). FIGS. 5 to 8 show a rotating perforated plate having this membrane structure.

The rotating perforated plate 3 is formed into a substantially hollow shape by a vibrator 1 and a spacer plate 12 interposed between the pipe 1. For each pipe 1]-, a small hole 14 for injecting fluidizing gas and F! and both 7:M of pipe 11 are closed as blind [
1-Niji. The drilling of the small hole 4 in the pipe 11 is facilitated because it is formed perpendicular to the tangent to the small hole forming portion. The pipe having the small hole 14 formed in this way is held against the inner wall surface of the perforated plate.
4 is opened so that UU<predetermined angle θ in FIG.

Therefore, it is easy to make a rotating perforated plate, and each pipe]
Since the entire perforated plate can be supported by the rigidity of -1, the strength of the entire perforated plate is increased, and even large-sized perforated plates can be manufactured.

However, the following problems have been pointed out in the rotating perforated plate having this configuration as well. Since both ends of each pipe 11 are blind, the fluidized medium particles 16 that have entered through the small holes 4 gradually accumulate inside the vibrator (['↑), which can cause problems such as clogging of the small holes 14. arise.

If the perforated plate is further enlarged, the distance between each pipe increases toward the upper 91M edge of the perforated plate, causing a strength problem. There are 8 clasps that allow you to attach a short pipe separately. For this reason, pipes are manufactured in two types, long and short, or eight types instead of eight, which reduces the effect of simplification of manufacturing.

1] The object of the present invention is to eliminate the above-mentioned problems, improve the membrane-type rotating perforated plate, and provide a fluidized bed forming device that is easy to manufacture and does not allow fluidized media to accumulate in the pipe. It's about doing.

In particular, this invention opens the lower ends of the pipes forming the rotating perforated plate to remove particles that have entered the pipes, and also unifies the length of each pipe to a constant length. This is a fluidized bed forming apparatus in which pipes are arranged in one or more stages depending on the size.

This invention will be described in detail below.

9 to 11 show a first embodiment of the invention. The J: and M:li portions of the pipe indicated by reference numeral 11 in the figure are blind as in the conventional case, but the lower end is not blind and has an opening 20 formed therein. The F end forming this opening 1]-a is bent so that the opening 20 opens downward, that is, in the direction of gravity, and this bent part 1]-a is connected to the injection nozzle 4
A rotating perforated plate 3 is formed by closely disposing the spacer plate 12 on the outer circumferential wall of the child end of each pipe 11 and interposing the spacer plate 12 between each pipe 11. 23 is formed for each pipe 11 and 1], 1.4 is the angle 0 in the tangential direction of iB6 inside the perforated plate.
It is a small hole opened 1'J. Note that the bending portion 11
Under a! I: Opening of iA [20 is fluidizing gas supply 1] 2
As in 3, there is an opening in the wind box 5.

By arranging α11<< as described above, even if particles of the fluidizing medium enter the pipe through the small hole 14, there is no risk of particles falling through the opening 20 and accumulating inside the pipe. In addition, since both the fluidizing gas supply port 23 and the opening 20 are open in the window box 5, the fluidizing gas supply port 23 and the opening 20 are open to the window box 5.
There is no separate problem with the influx of 0 bodies.

Figures 13 and 14 show another embodiment.

In the case of this embodiment, the perforated plate shown in the first embodiment is enlarged by further arranging pipes 11 on the outer periphery of the perforated plate, but all the pipes are prefabricated. Use the isomorphism and doujin that you have set up. That is, the pipe placed inside the porous hole 5 (7/3)
As shown in the first embodiment, the curved IJt section is arranged close to the jet nozzle 4, and another group of pipes is arranged outside these pipes 1j' to increase the size of the perforated plate. .In addition,
For these pipes H′ (further pipe trr
A larger perforated plate can be formed by shifting the arrangement of the plates. In other words, by arranging pipes of the same shape and size in multiple stages, it is possible to easily increase the size of the perforated plate, and since there is no need to manufacture pipes of different sizes, it is also possible to keep production costs low. be.

By implementing this invention, even in a membrane-type rotating perforated plate, the particles of the fluidized medium fragrance do not fall on the eve where the fluidizing gas is injected. It only causes blockage.

In addition, since all the pipes can be formed to have the same shape and shape, manufacturing can be carried out easily and economically regardless of the size of the perforated plate.

[Brief explanation of drawings]

Figures 1 to 4 show the flow g? Figure 1 is a cross-sectional view of the same apparatus, Figure 2 is a partial cross-sectional view of the rotating perforated plate, and Figure 3 is the same.
Figure F1rii and Figure 4 are partial cross-sectional views of the same perforated plate from l', Figures 5 to 8 show the structure of a conventional membrane-type rotating perforated plate, and Figure 5 shows a rotating perforated plate. 6 is a cross-sectional partial view of the perforated plate, FIG. 7 is a partial cross-sectional view of a pipe, FIG. 8 is a cross-sectional view of a pipe showing a state in which particles are deposited, and FIGS. 9 to 12. 9 shows a first embodiment of the present invention, FIG. 9 is a plan view of a rotating perforated plate, FIG. 10 is a perspective view showing a longitudinal section of the perforated plate, and the above figure is a partially cutaway perspective view of a pipe. , Figure 1.2 is a partially cutaway perspective view of the perforated plate;
FIG. 13 is a side view of a perforated plate showing the eighth embodiment;
The figure is a partial plan view of the perforated plate. ]--Fluidized bed forming device body 2 Fluidized bed 3 Rotating perforated plate 4 Jet nozzle 5 Wind box ]]-- ...Pipe 11a...Pipe song Jnor'ff1s12.
... Sveser plate 14 ... Small hole 20 ... Opening Fig. 5 Fig. 6 Fig. 7 Fig. 8 Fig. 1I Fig. 12 + lL Fig. 13 Fig. 14 figure

Claims (1)

[Claims] 1. A fluidized bed is created by a rotating perforated plate formed between a pipe in which small holes for fluidizing gas injection are opened in the tangential direction of the rotating perforated plate and a spacer plate interposed between the pipe. 1. A fluidized bed forming apparatus for forming a fluidized bed, characterized in that the lower end side of the pipe is opened in a wind box, and particles that have entered the pipe are discharged from this opening. 2- The fluidized bed forming apparatus according to claim 1, wherein the q-te feature is that a curved JJr portion is formed at the bottom of the pipe so that the lower end of the pipe having the opening opens in the direction of gravity. 3. The pipes are formed to have the same shape and size, and a group of these pipes is arranged in one or more stages around a jet nozzle in the center of the perforated plate.
Fluidized bed forming apparatus as described in .