Fluidized bed equipment

Abstract

A fluidized bed apparatus has a rotary rotor 4 arranged at the bottom center thereof, a disintegrator mechanism 5 arranged above the rotary rotor 4 , and a cylindrical draft tube 6 installed above the disintegrator mechanism 5 . A fluidizing gas jetted from a gas dispersion plate 3 causes powder particles P in a processing container 1 to form a fluidized bed in which they circulate so as to ascend through the gap between the outer periphery of the rotary rotor 4 and the bottom inner wall of the processing container 1 , the space between the disintegrator mechanism 5 and the inner wall of the processing container 1 , and the space between the outer periphery of the draft tube 6 and the inner wall of the processing container 1 , and descend through the inner portion of the draft tube 6.

Description

technical field [0001] The present invention relates to a fluidized bed device used in the manufacture of fine particles and granular particles of pharmaceuticals, pesticides, food, etc., and particularly relates to the coating treatment of particles corresponding to small particle diameters and making particles with small diameters Fluidized bed apparatus for particle granulation processing. Background technique [0002] The fluidized bed device generally uses fluid gas introduced from the bottom of the processing container to form a fluidized layer of granular particles in the processing container while spraying mist-like spray liquid (coating liquid, binder liquid) from the spray nozzle. To granulate or form a coating. In this kind of fluidized bed device, a composite fluidized bed device is formed along with the rotation, injection and stirring of granular particles. [0003] Figure 8 Shown is a fluidized layer device equipped with a gas flow pipe 5' (commonly known a...

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Problems solved by technology

[0004] In general, regarding the fluidized bed device, as a device for controlling the aggregation of particles by causing the adhesion and cohesiveness of the base material components in the spray liquid, the spray speed of the spray liquid is such that the secondary aggregation of the particles does not occur. The setting is very low (during spraying operation), or the spray speed of the spray liquid is set to a degree that does not cause aggregation by aggregating excess particles (during granulation operation), and the device according to the low setting When the spray speed of the spray liquid is set for a long time and the spray speed of the spray liquid, many experiments require mastering the characteristics of the spray liquid, etc., and there are many problems in terms of the manufacturing cost of the product.

[0005] In addition, when the agglomerated particles are dispersed by the force of compressed air, it is necessary to spray high-pressure compressed air from many injection nozzles in order to obtain the expected effect. There is no problem with increasing air consumption in the service

[0006] Furthermore, as setting the spray speed of the appropriate spray liquid, or dispersing by compressed air, particles with small particle diameters, such as particle diameters below 100 μm, especially for particles with particle diameters below 50 μm, the implementation will not generate secondary particles. Coating treatment of sub-agglomeration, or the above-mentioned particle diameter in granulation treatment is determined by the diameter of the finished particle, and it is actually difficult to manufacture product particles such as marking the particle size distribution.

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