JPH0612802Y2 - Spray dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a spray drying device, and more particularly to a spray drying device in which a stock solution dividing pin of a rotating disk is provided with a protrusion to prevent the stock solution from scattering to the outside.

[Conventional technology]

The spray dryer basically has three essential functions: spraying the stock solution, drying the sprayed microdroplets, and separating and recovering the fine powder product. Equipped with a drying chamber and a fine powder collector.

As an example of such a spray-drying device, conventionally, for example, the second
The one shown in the figure is known. (Actual exploitation Sho 58-2695
In the spray dryer of FIG. 2, the stock solution sprayed from the rotating disk 10 is instantaneously heated by the hot air blown from the inlet 12 in the drying chamber 11, the liquid component is evaporated, and the solid component is solidified. The component is a fine powder. The fine powder is taken out as a product from the lower part, while the hot air passes through the exhaust port 13 and is then cooled to be released to the atmosphere.

As a rotary disc of such a spray dryer, conventionally, as shown in FIG. 3, a rotary disc made of a metal such as stainless steel and having a large number of split pins 3 provided upright on the outer peripheral portion thereof has been used. The stock solution was sprayed uniformly by rotating this at high speed.

[Problems to be solved by the invention]

Generally, in the case of large and large number of rotating discs,
Since many undiluted solution inlets 4 can be provided around the shaft 2, the spray pattern through the split pins 3 becomes substantially uniform. However, it is structurally impossible to provide a large number of undiluted solution inlets 4 for a small-sized and small amount of rotating disk, and the number of undiluted solution inlets 4 is at most two. As a result, as shown in FIG. As shown in A, there is a disadvantage that the spray pattern is biased depending on the position of the stock solution inlet 4, and a uniform spray pattern cannot be obtained.

[Means for solving problems]

Therefore, as a result of intensive research conducted by the present inventors in view of the above-mentioned problems of the prior art, it is possible to solve the above problems by providing a protruding portion on the split pin of the rotating disk to prevent the undiluted solution from scattering to the outside. And has arrived at the present invention.

That is, according to the present invention, in a spray-drying device for directly producing a powder from an undiluted solution by spraying the undiluted solution into fine liquid droplets using a rotating disk, the undiluted solution of Provided is a spray-drying device, which is provided with a protrusion for suppressing scattering to the outside.

The pins for dividing the undiluted solution, which are provided on the outer peripheral portion of the rotating disk, are basically cylindrical in shape, and are located on the outside of them at the rear side as viewed from the rotating direction of the disk, and in a substantially tangential direction of the disk. It is preferable to use a structure having the above or a streamlined structure that matches the rotation direction of the disk, because a uniform spray pattern in the circumferential direction can be obtained without deviation of the spray amount.

[Action]

Providing a protrusion on the undiluted solution dividing pin of the rotating disk will prevent the undiluted solution from splashing to the outside. In other words, the undiluted solution will not easily fly out of the rotating disk, so it does not depend on the position of the undiluted solution supply port. A uniform spray is made in the circumferential direction.

〔Example〕

Hereinafter, the present invention will be described in more detail with reference to the embodiments shown in the accompanying drawings.

FIG. 1 shows an embodiment of a rotary disk used in the spray dryer according to the present invention. In the figure, a large number of stock solution dividing pins 3 are provided on the outer peripheral portion of a rotating disk 1 made of metal such as stainless steel. This stock solution dividing pin 3
It has a streamline that matches the rotation direction of the disk. Further, two stock solution inlets 4 are provided around the shaft 2.

In the above configuration, the stock solution is introduced into the rotating disk 1 through the stock solution inlet 4 and sprayed in the circumferential direction through the stock solution dividing pin 3, but the shape of the stock solution dividing pin 3 is as described above. It has a streamline that matches the direction of rotation and suppresses the dispersion of the stock solution to the outside to some extent, so that the stock solution is not sprayed only from near the stock solution inlet 4 to the outside,
As shown in B of FIG. 4, it is also sprayed to the outside from the stock solution dividing pin 3 located far from the stock solution inlet 4.

The fine droplets thus sprayed are then momentarily dried by the hot air blown from around them to produce fine powder. Fine powder is taken out from the bottom as a product,
On the other hand, the hot air, after passing through the exhaust port 13, is subjected to a predetermined temperature lowering process and opened to the atmosphere.

Hereinafter, the spray dryer of the present invention will be described in more detail.

(Example) Using a spray disk having a diameter of 84 mm shown in FIGS. 1 and 3, stabilized zirconia (Ca0.
15Zr0.85O1.85) stock solution concentration 60%, throughput 30kg /
Sprayed at a rate of Hr. The drying chamber used had a diameter of 2000 mm, a straight body height of 1,500 mm, and a total height of 3,500 mm, with a cylindrical upper part and a funnel-shaped lower part. The hot air inlet temperature was 220 ° C, and the exhaust air temperature was 110 ° C.

The stock solution was spray-dried under the above conditions. As a result, the properties of the product fine powder were as follows.

[Advantages of the Invention] As described above, according to the spray drying apparatus of the present invention, since the undiluted solution dividing pin of the rotating disk is provided with the protruding portion for suppressing the dispersion of the undiluted solution to the outside, the undiluted solution is sprayed. There is an advantage that a uniform spray pattern can be obtained in which the pattern does not depend on the position of the stock solution inlet.

Further, there is an advantage that undried adhesion to the drying chamber is reduced and the yield can be increased.

[Brief description of drawings]

FIG. 1 shows an embodiment of a rotary disk used in the spray dryer according to the present invention, (a) is a sectional view, and (b) is a sectional view.
Is a plan view, FIG. 2 is an explanatory view showing a spray drying device using a rotary disk as a sprayer, FIG. 3 shows an example of a rotary disk in a conventional device, and (a) is a sectional view.
FIG. 4B is a plan view, and FIG. 4 is an explanatory view showing a spray pattern when the present invention and the conventional split pin are used. 1 ... Rotating disk, 2 ... Rotating shaft, 3 ... Undiluted solution dividing pin, 4
... undiluted solution inlet.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Hiroki Takahashi 1-13-1 Nihonbashi, Chuo-ku, Tokyo TDC Corporation (72) Inventor Masaaki Okawara 3847 Okawara Kakoki, Ikebe-cho, Midori-ku, Yokohama-shi, Kanagawa Co., Ltd. (72) Inventor Katsumi Kobayashi 3847 Ikebe-cho, Midori-ku, Yokohama-shi, Kanagawa Okawara Kako Machinery Co., Ltd. 56) Bibliography Sho 62-179052 (JP, U)

Claims (3)

[Scope of utility model registration request] 1. A spray-drying apparatus for immediately producing a powder from an undiluted solution by spraying the undiluted solution into fine liquid droplets by using a rotating disk, wherein a undiluted solution of the undiluted solution is added to an undiluted solution dividing pin of the rotating disk. A spray drying apparatus, characterized in that a protrusion is provided for suppressing scattering. 2. The stock solution dividing pin has a cylindrical shape as a basic shape, and is located on the outer side thereof on the rear side as viewed from the rotation direction of the disk,
The spray drying device according to claim 1, wherein the disk has a shape having a protrusion substantially tangential to the disk. 3. The spray dryer according to claim 1, wherein the stock solution dividing pin has a streamlined shape that matches the rotational direction of the disk.