JPS62117601A - Spray drier - Google Patents

Abstract

PURPOSE:To obtain large particles from a small amt. of material in a small space by forming the main drier body into a flat shape and blowing hot air from both side surfaces around a spray disk as a spiral flow in the direction opposite to the rotating direction of the spray disk. CONSTITUTION:The main dryer body is formed into a flat shape and the center line of the rotation of the spray disk 4 is oriented at right angle or almost right angle to both side surfaces 1 and 1' of the main body. A liq. to be sprayed is supplied to the spray disk 4 from a liq. feed pipe 5 along the rotating shaft of the spray disk 4. The drying hot air is blown into the main body from a hot air blowing port 6 through a hot air inlet pipe 7 and a spiral flow in the direction opposite to the rotating direction of the spray disk 4 is produced. Besides, the hot air used for drying is sent to a separator on the outside of the system along with dried particles from a hot air outlet 8. The particles are dropped through an oval small-bore part and a hopper 3 while being dried and discharged from a particle discharge port 9.

Description

[Detailed description of the invention] [Industrial application field] The purpose of the present invention is to obtain relatively small amounts of large particles.

In other words, it relates to a spray dryer for testing purposes.

[Prior art] Conventional spray dryers equipped with a rotating spray plate and used for tests to obtain small quantities of material simply reduce the size of a large capacity product and increase the number of rotations of the spray plate to obtain fine particles. It looks like this. Currently, in order to obtain large particles, the number of rotations of the blast plate is reduced, knowing that a large amount of particles will adhere.

The structure will be explained with reference to FIG. This figure shows a typical example of a conventional dryer and is similar to a large-sized dryer. A conical part 41 is disposed at the bottom, and it is assembled vertically.

The spray plate 4 rotates at high speed and sprays liquid.

It is installed within the cylindrical portion 40 horizontally on the center line of the cylinder. The liquid to be sprayed is supplied to the spray plate 4 from a liquid supply pipe 5 installed along the rotation axis of the spray plate 4. The hot air for drying passes through the hot air inlet pipe 7 and is blown into the dryer main body from the hot air blowing port 6 at the top of the cylindrical part 40, and is used for drying. And the hot air is 9 from the hot air outlet 8 of the conical part 41 at the bottom of the dryer main body! , are sent to the dust collector along with some of the product. The remaining particles are collected from the particle outlet 9 in the F section of the conical section 41.

[Means to be Solved by the Invention] In general, in a spout dryer, when trying to obtain large particles, the distance that the ejected particles fly becomes longer and the diameter of the cylindrical part inevitably becomes larger, and the diameter of the cylindrical part increases accordingly. However, if the dryer is made smaller, i.e., each cylindrical part is made smaller, depending on the small amount of liquid,
Colors where there are many undried particles attached to the dryer body due to insufficient flying distance of the particles, this not only reduces the yield of dried particles but also changes the particle size distribution, apparent density, etc. There are drawbacks.

The present invention aims to provide a rotary spray dryer that can obtain a relatively small amount of large particles and that occupies a small area and space.

[Means for solving the problem] In the present invention, the flying direction of droplets sprayed by a rotating spray plate is widened, a drying section is added to the rear side, and the direction of the rotational center line of the spray plate is narrowed. It has a flat space and is characterized by blowing hot air from both sides around the spray plate while giving a swirling flow that is opposite to the direction of rotation of the spray plate.

[Function] The present invention is a flat-type jet 21 dryer that is spread out in the direction in which particles fly, and a sufficient distance for large particles to fly and a sufficient drying space can be ensured. Also, since the dryer itself is flat, it can be made narrow and parallel to the wall of a building, so it occupies a small space.
Therefore, 'Eruption drying allows large particles of small objects to be obtained in a small space [Example] The present invention will be described in detail below with reference to the drawings. FIG. 1 is a view of both sides of the embodiment cut away from the center, and the same parts as shown in FIG. 5 are given the same reference numerals.

The main body has two sides 1 and 1' which are substantially oval in shape and are vertically opposed to each other on a flat surface with the smaller diameter side facing the other side, a band-like surface 2 surrounding the peripheral edge, and a hopper at the bottom. This is the one with section 3 attached.

The rotating spray plate 4 has left and right sides on the large diameter part at the top of both sides.
The two sides are mounted at approximately the same distance from each other so that the flight direction of the sprayed droplets is approximately parallel to both sides. That is, the center line of rotation of the spray plate is perpendicular or almost perpendicular to both sides [, 1'.

The liquid to be sprayed is supplied to the spray plate 4 from the liquid supply pipe 5 along the rotation axis of the spray plate 4. The hot air for drying passes through the hot air manifold pipe 7, and from the hot air blowing ports 6 provided near the periphery of the spray plate 4 on both sides 1 and 1', a swirling flow opposite to the direction of rotation of the spray plate 4 is created. It is blown into the main body of the dryer. This is an effective means for preventing undried particles from adhering to the vicinity of the jet plates on both sides and for minimizing the distance that each particle flies. Further, since the hot air blown from both sides collides with the spray plate 4 and its surroundings, contact with the particles t takes place in 4 minutes, which is favorable in terms of heat transfer.

The hot air used for drying has a hot air volume [
18 to a separator outside the system.

The particles fall while drying through the approximately egg-shaped small diameter portion of the main body and a portion of the hopper, and are discharged from the particle discharge port 9.

FIG. 1 is a sectional view taken along the line A- in FIG. 3, and both sides 1.1' are flat, and the device is substantially symmetrical. However, both sides do not necessarily have to be flat, nor do they have to be symmetrical.
The shape of both sides is determined by the particle size distribution of the resulting product, the physical properties of the liquid, the amount of liquid supplied, the amount of hot air, the blowing speed of the hot air, and the strength of both sides. Note that the amount of hot air from both sides does not have to be the same on the left and right sides; this is determined by the shape of the flow of the sprayed particle groups.

Although not shown, the hot air outlet and the particle outlet may be combined and then separated.

Figure 2 is a cross-sectional view of 5 both sides 1. r has a concave lens shape. At the bottom is hopper 3.

FIG. 3 shows a circle with both sides 1 viewed from the outside.

The longer bottom part is a space for the particles that are falling due to gravity to dry completely.

In addition, some hot air may be blown into this space to improve the drying ability.

FIG. 4 is essentially the same as FIG. 3, but the upper portions of both sides are rounded.

In the present invention, the sizes of the opposite sides are basically determined by the size of the particles to be obtained, and the size of the two sides is determined by the amount of dry matter obtained per hour, the amount of hot air, the physical properties of the liquid, etc. The interval of 1' is determined.

In the present invention, both sides cannot be made horizontal, nor is it necessary.

[Effects of the Invention] As shown in the examples, the present invention has a wide flat space in the direction in which the liquid is sprayed, the distance that one particle flies is long, and the drying time is long, so despite the small volume, Large particles can be obtained efficiently.

This is a major feature of a small-capacity model that has never been seen before, and is of great benefit for research on dry products, focusing on particle size distribution, apparent density, etc.

Also, since the main body is biased, it can be installed on one side of the wall of a building, etc., so it is highly effective as a space-saving spray dryer.

[Brief explanation of drawings]

1 and 2 are cross-sectional views of embodiments of the present invention. FIGS. 3 and 4 are external views of opposing sides of an embodiment of the present invention. In addition, Figure 1 is A-A in Figure 3.
Corresponds to a cross-sectional view from '. FIG. 5 is an explanatory cross-sectional view of a conventional example. Reference numerals in the figure indicate. ■, 1' is both sides, 2 is the band surface. 3 is a hopper, 4 is a spray plate. 5 is a liquid supply pipe, 6 is a hot air inlet, 8 is a hot air outlet, and 9 is a particle outlet. shows.

Claims (1)

[Claims] a) The main body of the dryer has two substantially oval-shaped surfaces with the larger diameter facing up, vertically opposing each other at a predetermined interval to form both sides, and the peripheral edge of the dryer body is formed into a band-like shape. It is a flat space with a hopper attached to the small diameter part at the bottom, and b) The rotating spray plate is placed approximately in the center of the large diameter part above both sides, so that it is parallel to both sides. installed in the dryer main body to spray the liquid, and c) the drying hot air is directed from both sides near the periphery of the rotating spray plate so that they collide with each other and create a swirling flow that is opposite to the rotational direction of the spray plate. give and blow, d
) The hot air outlet and dry particle outlet are installed at the bottom of the dryer body. A flat spray dryer featuring the above structure.