JPH03284343A - Fluidized bed treatment apparatus - Google Patents

Abstract

PURPOSE:To suitably discharge large particles generated in the treatment process by forming the draft openings located at least in the area facing to a product discharge opening among the draft openings located along the peripheral part of a fluidizing floor in such a way that hot air is blown out to the direction of the side wall of the fluidizing chamber. CONSTITUTION:The fluidizing floor 11 is provided to the bottom part of the fluidizing chamber 3. The process of drying, granulation, or coating, etc., is carried out by blowing up hot air from plural draft openings 12 formed in the fluidizing floor 11. The draft openings 12a located at least in the area facing to the product discharge opening 7 among the draft openings 12 located along the peripheral part of the fluidizing floor 11 are so formed that hot wind is flown out to the direction of the side wall of the fluidizing chamber 12. As a result, the large particles which are contained in the raw material or generated in the treatment process are suitably discharged. Consequently, a preferable fluidizing state is maintained, and the production efficiency is improved without useless work, such as the work of removing the remained material.

Description

[Detailed Description of the Invention] (Objective of the Invention) (Industrial Application Field) The present invention relates to a fluidized bed processing device, and particularly to a fluidized bed treatment device that determines the direction and amount of hot air blown out when hot air is sent into a fluidized chamber. This is related to improvements.

(Background of the invention) A fluidized bed treatment device fluidizes powder and granules in the fluidization chamber by blowing hot air through the ventilation holes of the fluidized bed provided at the bottom of the fluidization chamber, and performs processes such as drying, granulation, and coating. When performing processes such as drying, granulation, and coating using this sophisticated fluidized bed processing equipment,
Alternatively, unless large particles (so-called lumps) generated during the treatment process are properly discharged from the flow chamber, a problem arises in that the flow is obstructed. Particularly in the case of continuous processing, if these large particles are not properly discharged, they will accumulate on the fluidized bed one after another, and in the worst case, the fluidization will stop.For this reason, conventionally, rotating stirring blades were installed in the fluidizing chamber. Some used a fluidized bed with directional ventilation holes to eject large particles using the centrifugal force of the resulting airflow.

However, even with such a method, large particles are brought toward the side wall of the flow chamber to some extent, but the large particles cannot be efficiently discharged.The following reasons can be considered for this. In other words, in the flow chamber, the powder and granules are mainly blown up from the center, descend along the side walls, and head toward the center.As a result of this large amount of powder and granules, large particles flow up to the side walls of the flow chamber. It is not possible to reach the outlet provided in the

(Technical matters attempted to be developed) The present invention was made in view of this background, and
This is an attempt to develop a fluidized bed treatment device that can appropriately discharge large particles mixed in raw materials or generated during the treatment process by improving the fluidized bed.

(Structure of the Invention) (Means for Achieving the Object) That is, the fluidized bed processing apparatus according to the present application has a fluidized bed provided at the bottom of the fluidized chamber, and hot air is blown up from a plurality of ventilation holes formed in the fluidized bed for drying and granulation. In an apparatus for performing operations such as coating, at least the vents in the area facing the product discharge port among the vent holes in the peripheral portion of the fluidized bed are formed so that hot air is blown toward the side wall of the fluidizing chamber. The present invention is characterized by the following, and aims to achieve the above object.

(Function of the Invention) In the present invention, at least the vents in the area facing the product discharge port among the vents in the peripheral portion of the fluidized bed are formed so that hot air blows out toward the side wall of the fluidized chamber. Large particles mixed in the raw materials or generated during the processing process are discharged from the product discharge port against the influence of the flow of powder and granules.

(Example) The present invention will be explained in detail below based on the illustrated example. Reference numeral 1 denotes a fluidized bed treatment apparatus according to the present invention, which has a substantially cylindrical fluid chamber 3 constituting the upper part thereof. In contrast, a hot air supply section 6 and a product discharge lower are provided.The fluidization chamber 3 is a place for fluidizing the powder and granules, and approximately in the center thereof there is a wall extending inward from the side wall of the fluidization chamber 3. As an example, three conduits 8 are provided, and a nozzle 9 is attached to the tip of the conduit 8. Incidentally, from these nozzles 9, a binder liquid is sprayed during granulation, and a coating liquid is sprayed during coating. Granulation and coating are performed by sprinkling them onto the flowing powder and granules.In addition, in the case of drying, this nozzle 9 is not used, and the hot air supply section 6 is used to flow into the fluidizing chamber 3. The hot air supply chamber 10 is provided at the bottom of the fluidized bed treatment apparatus 1. A fluidized bed 11 is provided at the boundary between the hot air supply section 6 and the fluidized chamber 3. .

This fluidized bed 11 is for regulating the amount and direction of hot air sent from the hot air supply chamber IO into the fluidized chamber 3,
As shown in Fig. 1.2, the entire body is disk-shaped, and a plurality of ventilation holes 12 are formed on its surface. The present invention is characterized by the direction of the ventilation holes 12, and among the ventilation holes 12 at the peripheral edge of the fluidized bed 11, at least the ventilation holes 12 in the range facing the product discharge lower are in the direction of the fluidization chamber 3. It is formed so that hot air blows out toward the side wall. The ventilation holes in the area facing the product discharge lower are shown below as ventilation holes 12.
a to distinguish it from other ventilation holes 12. Incidentally, if the ventilation hole 12a in the area facing the product discharge lower is formed so that hot air blows out toward the side wall of the flow chamber 3.

Because the hot air blows toward the product discharge lower, the fluidized bed 1
The large particles that accumulate near the discharge port on 1.

It is constantly pushed to the discharge lower and discharged. Here, as the formation mode of such a ventilation hole 12, FIGS. 2(a) to 2(c)
) can be adopted.

In the case shown in FIG. 2(a), vent holes 12a in the peripheral edge of the fluidized bed facing the product discharge lower are formed so that hot air blows out toward the side wall of the fluidized chamber. The ventilation holes 12 in the range are formed so that hot air blows out in the tangential direction of the circular fluidized bed. It is sufficient that at least the ventilation holes 12a in the range facing the product discharge lower are formed so that hot air blows out toward the side wall of the flow chamber. In the case shown in FIG. 2(b), all the ventilation holes 12, 12a
is designed to blow hot air toward the product discharge lower. In this case, it is not necessarily possible to specify the ventilation hole 12 that actually sends hot air to the large particles accumulated near the product discharge lower, pushes the large particles, and discharges them. The one closest to the one shown in FIG. 2(c) is represented as the vent hole 12a.

A rotating stirring blade 13 is provided directly above the fluidized bed, and ventilation holes 12a are formed in the area facing the product discharge lower so that hot air is blown toward the side wall of the fluidization chamber, and punching or other holes are formed in the other area. The zero-order product discharge lower, which is formed with a wire-mesh-like ventilation hole 12, takes out products that have been subjected to processes such as granulation, and also discharges so-called large particles. In addition, the classification of products and large particles is as follows:
Appropriateness is determined by a classification device, etc. installed in the downstream process of the product discharge lower. Furthermore, when considering the horizontal cross section of the flow chamber 3 where the product discharge lower is installed, the direction in which the product discharge lower is provided with respect to the flow chamber 3 is perpendicular to the tangent of the circle that is the cross section, as shown in Figure 3 (a). In addition to providing it in the direction, it may also be provided in the tangential direction of the circle that is the cross section as shown in FIG. Since the granules and granules flow in a swirling manner, the granules can be easily guided to the product discharge lower along the flow.

The fluidized bed processing apparatus 1 of the present invention has the structure as described above, and the usage state of this apparatus will be explained below by taking a continuous granulation operation as an example. First, powder or granular material as a raw material is continuously supplied into the flow chamber 3, and when it reaches a certain amount,
Hot air is also sent to the hot air supply chamber 10, and the binder liquid is sprayed from the nozzle 9. As a result, the powder particles flow in the flow chamber 3 and are granulated by the action of the binder liquid. In this granulation process, large particles that are mixed in the raw materials or generated during the granulation process tend to accumulate on the fluidized bed.

Such large particles are discharged from the product discharge lower by hot air blown out through the ventilation hole 12a formed in the area facing the product discharge lower.

(Effects of the Invention) In the present invention, hot air is blown out toward the side wall of the fluidized chamber 3 through at least the vents 12a in the range facing the product discharge lower among the vents 12 at the peripheral edge of the fluidized bed 11. Therefore, large particles mixed in the raw materials or generated during the processing process are pushed toward the product discharge lower. Therefore, such large particles.

The powder is blown up from the center of the fluidization chamber, descends along the side walls, and is discharged from the product discharge lower by overcoming the force of the circulating movement of the powder and granules toward the center. This allows a good fluidity state to be maintained, eliminating wasteful work such as removing stagnant matter, and improving manufacturing efficiency. In addition, if the fluidity is improved, large-diameter particles are less likely to be formed during granulation, and local unevenness in drying is also prevented during drying, resulting in a better product. Furthermore, such effects are even more pronounced when continuous processing is performed.

[Brief explanation of the drawing]

Fig. 1 is an exploded perspective view showing the fluidized bed processing apparatus of the present invention, Fig. 2 is a plan view showing various forms of ventilation holes formed in the fluidized bed, and Fig. 3 shows the installation position of the product discharge port. FIG. 3 is a cross-sectional view showing two different embodiments. 1; Fluidized bed treatment device 3; Fluidization chamber 6; Hot air supply section 7; Product discharge port 8; Conduit 9, nozzle 10, Hot air supply chamber 11, Fluidized bed 12, Vent hole 12a; Vent hole 13; Stirring blade ((7 ) (b)

Claims (1)

[Claims] In an apparatus in which a fluidized bed is provided at the bottom of the fluidized bed and hot air is blown up from a plurality of vent holes formed in the fluidized bed to perform operations such as drying, granulation, coating, etc., at least one of the vent holes at the peripheral edge of the fluidized bed A fluidized bed processing apparatus characterized in that the ventilation holes in the area facing the product discharge port are formed so that hot air is blown out toward the side wall of the fluidization chamber.