JPS6217152B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus in which perforated plates are arranged in multiple stages and powder and granular material is continuously dried while falling from the upper perforated plate to the lower perforated plate in sequence.

There are various methods for drying granular materials in a water-containing state, such as fluidized drying, vibration drying, and airflow drying, all of which dry by bringing hot air into contact with granular materials.

In equipment that supplies powder from one side and discharges it from the other while drying continuously using hot air, it is necessary to increase the contact time between the hot air and the powder in order to make drying effective. This increases the floor space of the device.

Therefore, in order to reduce the floor space of the apparatus, a multi-stage type is considered, but in a multi-stage type, hot air is supplied to each stage, making the apparatus complicated.

Furthermore, in the various types of drying mentioned above, the hot air is
Since the hot air is exhausted after only 1 contact, the heat utilization efficiency of the hot air is low and a large amount of heat is wasted.

The present invention is a multi-stage hot air drying device in which hot air is passed from the lower stage to the upper stage to perform drying at each stage and to fully utilize the heat quantity of the hot air.

In the present invention, annular perforated plates are arranged in multiple stages in a cylindrical case that revolves, each perforated plate is provided with a falling opening and a falling tube, and powder and granules of the material to be dried are placed on the perforated plate in a circular direction. It moves and falls onto the next perforated plate, and at the same time forms a pile of material at the lower end of the falling tube.
By raising hot air upward from below the perforated plate at the lowest level, which does not have a drop opening, drying is carried out across all levels.

Embodiments of the present invention will be described with reference to the drawings.

A large number of radial baffles are provided on the disk, and the disk is rotated in a horizontal plane (called gyroscopic motion).
There is an apparatus that performs granulation by supplying a water-containing raw material onto a disk, and it is known as JP-A No. 28779 of 1977. This Batsuful has a mountain-shaped (triangular) cross section, and the slope of one slope of the mountain shape is different from the slope of the other slope. For example, the slope in the direction of rotation of the gyroscope is 30 degrees, and the other side is 60 degrees. It's summery.

The powder and granules supplied onto the disk will climb up the slope with a small slope and fall down the slope with a large slope due to the inertia of the disk, and the powder and granules will eventually fall onto the disk. It will move in a circular direction at the top. As a result, granulation is performed without the powder particles sticking to the disk.

The present invention makes use of the movement of powder and granules in the above-mentioned granulation device, uses a circular plate as a perforated plate to form hot air vents, and moves the powder and granules from the upper stage to the lower stage of the perforated plates arranged in multiple stages. I'm trying to make it fall.

In the drawing, 1 is a cylindrical case, and inside thereof, five annular perforated plates 2, 3, 4, 5, and 6 are arranged at equal intervals in multiple stages. It is attached to the periphery. A material supply port 7 and a hot air discharge port 8 are provided on the top wall of the cylindrical case 1 near the outer periphery. An opening is provided in the center of the top wall, and the opening and the annular perforated plates 2, 3, 4, 5,
Hot air supply pipe 9 inserted through the center opening of 6 and fixed.
The lower end of the cylindrical case 1 is located below the bottom perforated plate 6.
It opens toward the bottom wall. A material discharge port 10 is provided on the peripheral wall of the cylindrical case 1, located above the upper surface of the lowest perforated plate 6, and a material discharge pipe 11 is connected to the material discharge port 10.

Although not shown on the bottom surface of the cylindrical case 1,
A gyroscope drive device is provided, which is the same as that in the granulating device of JP-A-54-28779, in which the bottom wall of the case 1 is rotatably supported by a plurality of vertical eccentric shafts, and the eccentric A plurality of interlocking gears are fixed to the lower end of the shaft, and due to the interlocking of the gears, the cylindrical case 1 revolves around a constant radius in a horizontal plane without rotating itself.

As shown in FIG. 2, the uppermost perforated plate 2 is a circular plate in which a large number of small holes (not shown) are formed, and a circular opening is formed in the center. On the perforated plate 2,
A large number of buttresses 12 are provided at equal intervals extending radially from a central circular opening to the outer periphery, and have a triangular cross section, with two hypotenuses protruding in a mountain shape, and one hypotenuse having an inclination of about 30° with respect to the disk. The other hypotenuse is a large angle of about 60°. (In the figure, the width of Batsuful 12 has a smaller slope.
(The narrower the width, the greater the inclination) Therefore, the granular material moves in the direction of the arrow due to the gyroscope motion.

A falling opening 13 that spreads radially is provided at one location on the disk, one side of which is in contact with the buttful 12, and a weir plate 14 that projects higher than the buttful 12 radiates from the other side (forward in the direction of movement of the powder). extending in the direction. The upper end of a drop tube 15 is welded to the lower surface of the drop opening 13, as shown in FIG. The cross section of the drop tube 15 is the same as the drop opening 13,
The drop tube 15 hangs downward, and its lower end has a certain distance from the upper surface of the perforated plate 3 of the next stage in FIG. This gap is such that it is always blocked by powder and granules during the drying operation, and as a result, the passage of hot air is blocked. Therefore, the size of the above-mentioned interval is selected depending on the fluidity of the powder and the rotational speed of the gyroscope motion.

Perforated plates 3, 4, 5 below the second stage in Fig. 1
Since the only difference is the position of the drop opening, only the second stage perforated plate 3 will be explained with reference to FIG.

The perforated plate 3, like the perforated plate 2, has a perforated circular plate with a baffle 12 provided thereon. The falling opening 16 is located at the rear of the falling opening 13 of the perforated plate 2 of the first stage in the moving direction of the powder and granular material. and perforated plate 2
Similarly, a weir plate 14 is provided on one side of the drop opening 16, and the buttful next to the weir plate 14 is a large buttful 17, which is higher than the other buttfuls 12 and whose top extends above the lower end of the drop tube 15. It's getting full.

In a state where the first stage perforated plate 2 and the second stage perforated plate 3 are arranged vertically as shown in FIG.
Falling opening 13 of the perforated plate 2 of the tier and the perforated plate 3 of the second tier
As shown in FIG. 3, the falling opening 16 is at a misaligned position, and the falling opening 16 is offset by one pitch of the buffle 12 from the falling opening 13 at the rear of the flow of powder and granular material. Therefore, as can be seen in FIG.
It is between the weir plate 14 and the large buttful 17.
Similar to the perforated plate 2, a drop tube 15 is fixedly suspended from the lower surface of the drop opening 16 of the perforated plate 3.

The third and fourth stage perforated plates 4 and 5 are similar to the perforated plate 3, and the positions of the drop opening 16 and the large baffle 17 are shifted rearward in the flow direction of the powder and granular material.

The lowermost perforated plate 6 does not have the drop opening and drop tube of the upper perforated plate, and has a full 12
is provided, and has a large baffle 17 and a weir plate 14 corresponding to the falling tube 15 of the upper perforated plate 5, but the weir plate 14 serves as a discharge guide plate for powder and granules, and its outer end is used as a material discharge guide plate. It is in contact with one side of the discharge port 10.

To carry out the drying work, the cylindrical case 1 is driven by a gyroscope drive device, the powder to be dried is continuously supplied from the material supply port 7, and the upper end of the hot air supply pipe 9 is connected to a hot air source through a flexible pipe. Hot air is supplied into the cylindrical case 1 while communicating with the cylindrical case 1.

The hot air blows out from the bottom surface of the perforated plate 6 at the lowest stage, then reverses and ascends from the small hole in the perforated plate 6 through the small holes in the perforated plates 5, 4, 3, and 2 above it in order, and the hot air It is discharged to the outside from the discharge port 8. The supplied powder falls onto the top perforated plate 2, and the hot air rising from below prevents the fine powder from falling from the small holes.In this state, the perforated plate 2 By rotating, it moves in a circular direction (arrow) as shown in Figure 5 while repeatedly passing over the small slope of the Batsuful 12 and falling down the large slope. It is hung to dry. As a result of circular movement, the falling opening 1 as shown by the arrow
3, it falls from the drop tube 15 to the perforated plate 3 of the next stage. At this time, the powder particles trying to pass through the falling opening 13 collide with the weir plate 14.

The powder and granular material falling from the falling tube 15 passes through the perforated plate 3 of the next stage.
The material falls between the weir plate 14 and the large buttful 17, accumulates therebetween, seals the space between the lower end of the drop tube 15 and the perforated plate 3 (material seal), and maintains that state. The lower layer of the deposited powder and granules sequentially move in a circular direction over the small inclined surface of the large buffle 17. Next, the powder and granules move in a circular direction passing over a large number of buttfuls 12 one after another, and when they reach the drop opening 16 of the perforated plate 3, they fall from the drop tube 15 to the next perforated plate 4, and at the falling point. Maintains a deposited and sealed state. Thereafter, the perforated plates 4 and 5 are moved in a circular direction and dropped while repeating the same condition. On the perforated plate 6 at the lowest stage, the lower layer of the accumulated powder and granules moves in a circular direction one after another, and at the end, is guided to the material discharge port 10 by the weir plate 14, passes through the material discharge pipe 11, and is kept airtight by a rotary valve or the like. It is ejected while being retained.

In this case, each drop opening 16 of the perforated plates 3, 4, 5
..., is a position shifted backward by one pitch of the buffer 12 in the moving direction of the powder and granular material with respect to the upper droplet, and the material is deposited and sealed by the falling powder and granule from the upper layer one pitch in front of each droplet. A blockage is formed, and each perforated plate 2, 3, 4, 5, 6 is completely covered with a powder layer.

On the other hand, as mentioned above, hot air is supplied from the lower end of the hot air supply pipe 9, but as mentioned above, each of the perforated plates 2, 3,
4, 5, and 6 are covered with a powder layer moving in a circular direction, and the space between each perforated plate is blocked by material accumulation at the lower end of the falling tube, so the hot air does not blow through and reaches the lower perforated plate. It passes through the small holes of 6 and rises while contacting the powder and granules, and then passes through the perforated plates 5, 4, 3, .
The hot air rises in the order of 2 from below to above while contacting the powder and granules, and is finally discharged to the outside from the hot air outlet 8.

As can be seen from the above, the powder and granules move and fall from the upper stage to the lower stage, and the hot air rises from the lower stage to the upper stage.
During that time, drying will occur, and the hot air will consume the heat from drying as it rises, reaching a low temperature at the top stage, but the powder and granular material immediately after being supplied will be dried at that temperature. As the powder moves to the lower stage, it comes into contact with hot air at a high temperature, and at the lowest stage, it is sufficiently dried by the hot air at the highest temperature.

This means that the supplied powder and granules are preheated by low-temperature hot air and then dried by high-temperature hot air, while the hot air continues to rise while consuming heat sequentially from the lowest temperature. Drying will be carried out. Since the rising speed of the hot air is high, the hot air dries almost all of the powder and granules on the perforated plates of substantially all stages while rising from the bottom to the top.

As described above, according to the present invention, while the hot air for drying rises from the lower stage to the upper stage, it contacts the powder and granules in each stage and performs drying while lowering the temperature. The powder and granules are effectively utilized, and since the powder and granules move in a circular direction in each stage and fall from the upper stage to the lower stage, they come into contact with hot air from low to high temperatures, so that they are sufficiently dried.
Furthermore, although the drying device occupies a small floor area, it is possible to process a large amount of drying equipment.

[Brief explanation of the drawing]

The drawings show embodiments of the present invention.
The figure is a diagrammatic cross-section with some parts omitted, Figure 2 is a plan view of the uppermost perforated plate, and Figure 3 is a partial side view of Figures 2 and 4 viewed from arrow A. (cross section)
FIG. 4 is a plan view of the second stage perforated plate, and FIG. 5 is an oblique view showing the flow of powder and granular material. 1 is a cylindrical casing, 2, 3, 4, 5, 6 are perforated plates, 7 is a material supply port, 8 is a hot air discharge port, 9 is a hot air supply pipe, 10 is a material discharge port, 11 is a material discharge pipe, 12 is Batsuful, 13 and 16 are falling openings, 1
4 indicates a weir plate, 15 indicates a drop tube, and 17 indicates a large buffle.

Claims (1)

[Claims] 1 Perforated plates are arranged in multiple stages in a cylindrical casing equipped with a revolution drive device, and on the upper surface of each perforated plate, a large number of chevron-shaped buttfuls with large and small sloped surfaces on both sides are formed radially, Each perforated plate except the lowest one is provided with a drop opening, and the drop openings are in staggered positions from the top to the bottom. A drop tube is suspended from the bottom of each drop opening, and the lower end of the drop tube is placed below the bottom. A continuous drying device in which there is a gap between the perforated plate and the hot air supply pipe opens below the lowest perforated plate.