JPS637833Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to an aeration type agitation drying device that is equipped with an agitation device for the material to be dried and is supplied with aeration gas. It has features such as being able to dry efficiently and preventing powder and granules from falling to the gas supply side even without providing a separation plate such as a wire mesh.

(Disadvantages with conventional devices) Conventionally, this type of dryer is usually provided with a wire mesh or perforated plate for solid separation or hot air dispersion at the bottom of the drying cylinder.

There is no problem if the material to be dried is relatively coarse particles such as grains, but if the material is fine powder, clogging easily occurs and the drying efficiency decreases.

If the ventilation hole is made larger to eliminate this clogging, powder will fall onto the ventilation supply side, not only contaminating the device but also causing trouble to related equipment.

(Purpose of this proposal) This method enables extremely highly efficient drying without the need for wire mesh, etc., since the powder does not fall into the gas supply side, and the stirring effect of the gas in the drying cylinder can be exerted. An object of the present invention is to provide an agitation drying device that has no fear of clogging or the like.

(Structure and effect of the present invention) The present invention provides a ventilation introduction path below the lower surface of the drying cylinder equipped with stirring means such as screws or rotary blades, and also includes a swirl flow generating device inside the drying cylinder and supplies the drying gas through the device. Alternatively, the swirling flow generating device is configured to supply hot air, and the swirling flow generating device has a flange that closes the lower end of the ventilation introduction passage, a cylindrical body protruding from the center of the flange, and an upper end bored at the center of the cylindrical body. The cylindrical body is equipped with a closed central hole and a jet opening tangentially around the central hole, and the cylindrical body is installed with a swirling air space between it and the inner wall of the introduction passage to introduce gas supplied from below the flange. The swirling flow is supplied into the drying cylinder within the passage, that is, within the swirling air space.

In the drying cylinder, the material to be dried is vigorously stirred by being simultaneously stirred by the mechanical stirring means and stirred by the swirling upward flow. As a result, the solid air density inside the shell becomes uniform, and the time during which the particle surfaces are in contact with the gas becomes longer, resulting in rapid drying.

Furthermore, even if the operation of the device is stopped, a small amount of powder remaining in the shell will simply accumulate at the bottom of the swirling air space, and since there are no pores that communicate vertically in the device of this invention, this will prevent clogging. There is absolutely no risk that this will occur.

This will be explained with reference to the embodiment shown in the figure.

1 in the figure stores powder and granular material to be dried inside,
It is a cylindrical drying cylinder with both ends closed and has an exhaust port 2 in the upper part.A heating jacket 3 for introducing steam as a heating medium into the inside of the drying cylinder 1 is attached to the outer surface of the drying cylinder 1. The inner wall of the drying cylinder 1 is used as a heat transfer surface. 4 is a stirring blade, which is rotated by a rotating shaft 6 rotatably supported by bearings 5, 5.

At the bottom 1a of the drying cylinder, there is a tube 1 extending vertically downward.
b are vertically arranged to form a plurality of circular tubular ventilation introduction passages, that is, swirling flow generation areas 11.

Reference numeral 8 denotes a swirl flow generator, which includes a disc flange 8a.
A cylindrical body 8b is protruded from the center of the cylindrical body, and a blind central hole 9 is recessed from the flange side at the center of the cylindrical body, and a plurality of jet ports 10 are formed around this central hole in the tangential direction of the circle of the central hole. are located substantially on the same plane and are open.

Note that by opening the spout 10 downward to the outside, the swirling flow generation area 1 can be opened after the operation is stopped.
This further improves prevention of falling of the powder and granular material accumulated in 1 to the upstream side.

Moreover, by installing the cylindrical body 8b so that the upper end thereof is at the same level as the bottom surface of the drying cylinder, no special considerations are required in the design of the stirring blades, and the diffusion effect within the drying cylinder becomes uniform.

Reference numeral 7 denotes a ventilation supply header, each head 7b of which is connected to a pipe portion 1b at the bottom of the drying cylinder via a mounting flange 8a.

In the above apparatus, when a predetermined amount of powder to be dried is stored in the drying cylinder and the stirring blades 4 are rotating, when air or hot air is supplied from an air supply source (not shown) to the supply side of the header 7, the powder particles The body is mechanically stirred by stirring blades and heated from the body wall to radiate moisture, and at the same time, the supplied gas A is jetted from the center hole 9 of each cylinder through the jet nozzle 10 into the swirling flow generation area 11. When the airflow direction is changed tangentially,
This collides with the inner wall of the tube portion 1b, turns into an upward swirling flow in the circular tubular ventilation introduction portion, and is supplied into the drying drum.

Therefore, the powder and granules in the drying cylinder are subjected to mechanical stirring and air current stirring at the same time, and since these stirring directions are perpendicular to each other, the movement of each particle is complicated and the drying efficiency is increased. be.

The powder and granules dried in the drying cylinder in this manner are discharged from the discharge port 2 together with the gas and collected.

After the equipment stops operating, the residual suspended particles in the drying cylinder settle and accumulate on the bottom of the drum, and also on the upper surface of the flange of the swirl flow generator, but in this case, the jet nozzle 10 is formed horizontally or outwardly downward. Since this accumulated powder does not fall into the header, there is no need for a wire mesh for solid/gas separation as in the past, and there is no clogging, and there is little pressure loss, so the power for gas supply is also reduced. You can save money.

The swirling flow generator can be manufactured easily and inexpensively by assembling it using bolts 12 as shown in FIG. 4.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, in which FIG. 1 is a longitudinal sectional view, FIG. 2 is a sectional view taken along the line - in FIG. 1,
FIG. 3 is an enlarged longitudinal cross-sectional view of the swirl flow generating device, and FIG. 4 is a horizontal cross-sectional view thereof.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A drying cylinder equipped with an exhaust port above, containing a powder or granular material to be dried inside, and equipped with an agitating blade for stirring the powder or granular material, and the inside of the drying cylinder. In a ventilation stirring dryer equipped with a ventilation header that supplies hot air from below, a cylindrical body is provided protruding from the center of a partitioning disc flange that partitions the drying cylinder and the ventilation header, and a cylindrical body is provided at the center of the cylindrical body. A swirling flow generating device in which a blind center hole for introducing gas that opens downward is recessed, and a plurality of jet ports are formed in a tangential direction around the center hole and located on substantially the same plane;
The cylindrical body of the swirling flow generating device is located concentrically with the inner wall of a plurality of cylindrical ventilation introduction passages provided below the bottom surface of the stirring drying drum, with a swirling flow air space therebetween, and the ventilation header is arranged through the flange. Ventilated agitation drying device. (2) The device according to claim 1 of the utility model registration claim, wherein the spout is directed downward toward the outer periphery. (3) The device according to item 1 or 2 above, wherein the upper end surface of the cylindrical body of the swirl flow generating device is located at approximately the same level as the bottom surface of the drying cylinder.