JPH05277354A - Annular shaped fluidized bed device - Google Patents

Abstract

PURPOSE:To continuously preheat and dry without making an agglomerative powder and granular material lumpy. CONSTITUTION:An annular shaped fluidized bed is formed by providing a flow straightening conical body 6 at the center part of a perforated plate 5 in the circular fluidized bed device 4, the annular fluidized bed is provided with a separation weir 15 and an agitation mechanism composed of an agitation motor 8, a rotary shaft 9, a rotary arm 10 and an agitation flexible body 11 is mounted.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to preheating, drying, and
The present invention relates to a continuous fluidized bed apparatus that performs firing and the like.

[0002]

2. Description of the Related Art A conventional fluidized bed apparatus is a so-called batch type apparatus in which a fluidized bed having a circular or rectangular cross section is formed, and the powdery or granular material is supplied batchwise and discharged after drying. As a continuous type, the box-shaped fluidized bed is vibrated to move the powder or granules, or a transfer can (rake) is placed in the fluidized bed to move the powder or granules for continuous drying. There is something you are doing.

[0003]

The vibration type of the conventional continuous fluidized bed apparatus has a problem in that the undried material having a large particle size is mixed with the dried material and discharged. In addition, the movement of the powder or granules in the fluidized bed due to the rake does not sufficiently agitate the powder or granules between the lakes, so there is a problem such as a decrease in drying efficiency or the formation of agglomerates with cohesive powder or granules. Has occurred.

In the present invention, the powdery or granular material to be dried is continuously supplied to the fluidized bed apparatus, and the undried material is not mixed with the dried material and discharged, but only the completely dried material is discharged. Another object of the present invention is to provide an apparatus for efficiently fluidizing and drying the cohesive powdery particles without agglomerating in a lump.

[0005]

In order to achieve the above object, in a fluidized bed apparatus of the present invention, a horizontal cross section is circular, and a concentric upper conical cylinder is installed at the center of the circle, and the horizontal cross section is An annular fluidized bed is formed.

Further, in order to prevent mixing of the charged raw material and the dry discharged raw material, a separation weir is provided in a part of the annular portion, and a charging port and a discharging port are provided on both sides thereof.

[0007] Further, in order to prevent the cohesive powdery material from becoming a lump and causing a decrease in drying efficiency and other troubles, a rotating shaft is provided at the circular center portion, and the stirring arm of the fluidized bed fixed to it and the arm are attached to it. A stirring mechanism consisting of a stirrable flexible body is installed.

[0008]

In the continuous fluidized bed apparatus constructed as described above, the introduced dry raw material is fluidized and dried while being sufficiently agitated by the agitating mechanism, and is completely dried while moving in the annular fluidized bed section and is discharged from the outlet. Is discharged.

Further, the aggregating powder and granules are agitated and flow by the agitation mechanism so that the agglomerates agglomerate and are sufficiently dried without forming an agglomerate.

[0010]

EXAMPLES Examples will be described with reference to the drawings.
FIG. 1 is a vertical sectional view of a continuous fluidized bed apparatus of the present invention. The device consists of a cylinder and a cone, and the horizontal cross section of each part is circular.

The raw material feeder 1 is connected and attached to the upper part of the fluidized bed apparatus main body 4 via a feed pipe 2. The fluidized bed apparatus body 4 has a free space 3 as an upper space, and an exhaust pipe 14 is attached to an upper end thereof. The perforated plate 5 is attached to the middle portion. A straightening cone 6 is attached to the center of the perforated plate 5, and the upper part of the perforated plate 5 forms an annular fluidized bed.
The lower part becomes the hot air chamber 7.

In order to stir the fluidized bed formed on the annular fluidized bed, a stirring drive machine 8 is installed at the center of the upper part of the main body 4, and a plurality of rotary arms 10 are attached to a rotary shaft 9 connected to it.
A plurality of stirring flexible bodies 11 are attached to the rotating arm 10. The agitating flexible body 11 is made of a chain or elastic rod-shaped flexible material.

A discharge pipe 12 is attached to the end of the annular fluidized bed and is connected to a discharge machine 13. A hot air generator 16 is connected to the hot air chamber 7, and a blower blower 17 for blowing hot air is attached to the hot air generator.

FIG. 2 is a diagram showing the positional relationship between the separation weir 15 and the charging pipe 2 and the discharging pipe 14 which are installed so that the charging raw material and the dried discharging raw material do not mix.

FIG. 3 is a view showing the height relationship between the separating weir 15, the perforated plate 5, and the rectifying cone 6.

FIG. 4 is a vertical cross-sectional view showing the structure when the agitation drive machine 8 is arranged in the lower part of the main body 4.

[0017]

Since the present invention is constructed as described above, it has the following effects.

By forming an annular fluidized bed, it is possible to facilitate rotary agitation, prevent agglomeration of agglomerate powders, and stabilize the fluidized bed by stirring and improve efficiency such as drying. It was

Further, the annular fluidized bed is provided with a separation weir 15, and the charging port and the discharging port are separated on both sides thereof, so that the charged raw material moves through the circular portion while being agitated and dried to reach the discharging port. Therefore, there is no problem such as the conventional fluidized bed in which a part of the undried raw material flows into the discharge port and is mixed with the dry raw material.

[0020]

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an annular fluidized bed apparatus.

FIG. 2 is a diagram (A-A arrow view) showing a positional relationship between a separation weir, an input pipe, and a discharge pipe.

FIG. 3 is a diagram (a view from BB arrow) showing a height relationship between a separation weir and a perforated plate / rectifying cone.

FIG. 4 is a vertical cross-sectional view of the annular fluidized bed apparatus when a stirring drive machine is arranged in the lower portion.

[Explanation of symbols]

 1. Feeder 2. Supply pipe 3. Free space 4. Fluidized bed apparatus body 5. Perforated plate 6. Rectifying cone 7. Hot air chamber 8. Stirring drive 9. Rotating shaft 10. Rotating arm 11. Stirring flexible body 12. Discharge pipe 13. Ejector 14. Exhaust pipe 15. Separation weir 16. Hot air generator 17. Suction blower

Claims (2)

[Claims] 1. A fluidized bed apparatus body having a circular horizontal section (1)
A perforated plate (5) is horizontally arranged at the substantially central part of the plate, and a cylindrical rectifying cone (6) is installed in the central part of the plate to form an annular fluidized bed of the perforated plate, and a separation weir is partly formed on the plate. An annular fluidized bed apparatus characterized in that (15) is provided, and an input pipe (2) and an exhaust pipe (12) are provided on both sides thereof. 2. The annular flow bed according to claim 1, further comprising a stirring mechanism for the fluidized bed, which comprises an agitation drive machine (8), a rotating shaft (9), a rotating arm (10) and a stirring flexible body (11). apparatus.