JPS6035166B2 - Granulation equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a granulation device that injects a melt onto small powder particles that are circulated by gas to obtain powder particles with a larger diameter.

Conventionally, a granulator for urea, etc., as shown in FIG. 1, has been known.

This granulator has a cylindrical body 3 in the shape of an inverted truncated cone at the upper end of an air jet pipe 2' in which a melt jet nozzle 1' is disposed at the center of the rise.
', and while blowing out air vigorously from the ejection pipe 2', the small powder particles serving as the core are introduced into the cylinder 3' from the supply pipe 5' provided above the cylinder 3'. This is circulated by blowing air, the molten liquid is sent through the liquid sending pipe 4', and is injected from the injection nozzle 1' onto the circulating small powder particles to gradually adhere to the outer peripheral surface of the small powder particles to achieve the desired purpose. It has a structure that produces powder and granular material with a diameter of If it is desired to increase the granulation capacity of this granulator, it is common sense to scale it up.

However, the granulator using this granulation method is special, and when scaled up, when the spouted bed alone is large in size, considering the granulation mechanism of the spouted bed, it is necessary to circulate in proportion to the size to obtain the desired particle size. An increase in speed cannot be expected, and due to changes in the geometrical motion of particles, it is not possible to expect an increase in capacity in proportion to the scale-up of the device. Moreover, there are various problems such as difficulty in continuous operation and increased operating costs due to increased pressure loss in the spouted bed. The invention avoids simple scale-up and
The above problems are solved by installing a plurality of granulators in one container.

The present invention will be explained in detail below with reference to the drawings. 2 and 3 show an embodiment of the present invention. Reference numeral 1 denotes an airtight container in which a top plate 4 and an inclined bottom plate 3 are respectively joined to a vertical peripheral wall 2, and the lower ends of the top plate 4 and the bottom plate 3 are connected to a vertical peripheral wall 2. A gas (air) outlet 5 and a powder outlet 6 are provided in each section.

On the bottom plate 3, three circular or square-shaped ejection pipes 7 that eject gas pass through the bottom plate 3, protrude slightly from the bottom plate 3, and are fixed vertically at equal intervals, and at the top end of each ejection pipe 7 is an inverted pyramid. A pedestal-shaped cylinder 8 is connected to the ejection pipe 7 by passing through it. Note that the way the jet pipe 7 and cylinder body 8 are attached to the bottom plate 3 at the far right in FIG. do. Inside the container 1, there are three partition cylinders 11 whose cross-sectional shape is the same as the planar shape of the upper green part of the cylinder body 8, and whose bottom part is open. The granule overflow port 12 is raised, and the cylindrical body 8 is vertically connected to the gas discharge port 5. On the other hand, a supply pipe 9 is provided on the top plate 4 of the container 1 adjacent to the gas discharge port 5 for supplying small powder particles serving as a nucleus into the cylinder body 8 from the partition cylinder 11 .

Further, at the center of the upper end of the jet pipe 7, a liquid feeding pipe 10 is provided to protrude horizontally through the jet pipe 7. This liquid sending pipe 1 sends the melt into the cylinder 8 from the outside, and is equipped with an injection nozzle 13 at its tip for injecting the melt into the cylinder 8.
A gas blowing pipe 14 is horizontally connected to the lower end of the blowing pipe 7. By the way, the reason why the blowing pipe 14 is purposely branched off next to the blowing pipe 7 is to prevent lumps of powder and granules that have grown more than necessary inside the cylinder 8 and cannot be discharged from the overflow row 2 to the outside. This is to allow the gas to be discharged directly below through the jet pipe 7. The ejection pipe 7, the cylindrical body 8, the injection nozzle 13, etc. constitute a granulator A. In the figure, the cross-sectional shapes of the container 1, the cylinder 8, and the partition tube 11 are all square, but they are not limited to this, and may be round or other shapes.

In addition, in the diagram, three granulators A are installed side by side in one container 1, but the number of granulators A may be any number as long as it is two or more, and their arrangement. is also optional. Furthermore, the granulator A is not limited to the one shown in the figure, but may also be a granulator developed by the present inventors, for example, which has a structure in which small powder particles serving as a core are ejected from the ejection pipe 7 together with gas into the cylinder 8. It is also possible to use a new granulator or the like (in a granulator with this structure, the core small particles are fed from the blowing pipe 14 in the figure, and the gas is fed from the lower end of the blowing pipe 7). Furthermore, although the overflow port 12 shown in the figure is provided continuously over the entire circumference of the cylinder 8, the partition cylinder 11 is joined to the cylinder 8 and holes are intermittently bored therein, so that the overflow port 12 is provided continuously over the entire circumference of the cylinder 8. It can also be used as a flow outlet. Next, the operation of the granulation apparatus according to the present invention will be explained with reference to the flow sheet of FIG. 4 and FIGS. 2 and 3. First, small powder particles with a desired particle size are supplied to the supply pipes 9 of the granulator A, the blower 16 and the blower 17 are driven, and an appropriate amount of air is pumped out from the lower air jet pipe 7. Introduce granulator A
The small particles that form the core inside are made to flow and circulate up and down. On the other hand, the liquid sending pipe 1 pumps a molten liquid such as urea and injects it from the injection nozzle 13 onto the small powder particles that are being circulated. Then, while keeping the amount of powder and granular material flowing and circulating within the cylinder 8 almost constant, the powder and granular material overflows from the overflow port 12, is taken out from the discharge port 6, and is cooled by the cooler 18, and then Apply to vibration node 19. The vibration node 19 is in the desired grain flea range,
The powder and granules are divided into those larger than this and those smaller than this (two types), and the powder and granules in the desired particle size range are put into the product cushion tank 201 and a predetermined amount is transferred to the electromagnetic feeder 21.
From there, it is sent to a hammer crusher 22 to be crushed into small powder particles that become cores, and a part is sent to an electromagnetic feeder 23 to a belt conveyor 24, a bucket conveyor 25, a circulation cushion tank 26, an electromagnetic feeder 27, a belt conveyor 28, and a supply pipe. 9 and returned to the granulator A, and the powder and granules that overflowed the product cushion tank 20 (only the collected amount comes out) are mixed to form the product P. The powder crushed by the hammer crusher 22 is passed through the vibration node 29 and sent to the belt conveyor 24, and the fine powder separated by the vibration line 29 and the fine powder separated by the vibration node 19 are separated. The powder and granules are sent to a melter (not shown) and remelted, and then passed through the liquid feed pipe 1.
Forced to 0. The second fine powder separated by the vibrating line 19 is placed in a string cushion tank 30, and then sent to the belt conveyor 24 via the electromagnetic feeder 31, together with the other fine powder described above. is returned to granulator A. A cyclone 32 is installed in the container 1 and the cooler 18, respectively.
, 33 are connected to purify the air and release it into the atmosphere, and send the captured fine powder to the melter.

A large lump of powder or granular material generated within the cylinder 8 falls down the ejection pipe 7 and is taken out by a belt conveyor 34. 35 in the figure is an air heater (air cooler) that heats (or cools) the temperature of the air blown from the blowing pipe 14.
, 36 and 37 are blowers, and 38 is a bucket conveyor.

As explained above, the granulation device of the present invention has one container 1.
Since the configuration has multiple granulators A installed within the same unit, unlike the case of scaling up the granulator itself, it is possible to increase the size while maintaining the best granulation efficiency and increase the granulation capacity. It can be increased in any way.

In addition, the overflow port of each granulator can be changed as appropriate,
Alternatively, it is possible to change the degree of opening and closing of the gas outlet provided in the partition tube of each granulator, making it possible to easily modify various granulation operations that could not be performed with a single granulator. be. Furthermore, it is possible to reduce operating costs due to pressure loss in the granulator. In addition, multiple granulators can all be operated independently, so even if some granulators break down, the other granulators can continue operating as is. be able to. Furthermore, since the powder and granules from each granulator are discharged in one place, only one circulation line equipment is required except for the granulator, which reduces construction costs and makes operation easier. , the device is easy to miniaturize and manufacture, and the manufacturing cost is low.

[Brief explanation of the drawing]

Fig. 1 is a schematic cross-sectional view showing the main parts of a conventional granulator, Fig. 2 is a schematic cross-sectional view of a granulator according to the present invention, and Fig. 3 is taken along the (m-leg) line in Fig. 2. The cross-sectional view and FIG. 4 are flow sheets showing an example of use of the present granulation apparatus. 1... Container, 5... Outlet, 6...
...Exhaust port, 7...Ejection pipe, 8...
Cylindrical body, 9... Supply pipe, 13... Injection nozzle, A... Granulator. Figure 1 Figure 2 Figure 3 Figure 4

Claims (1)

[Claims] 1 A container 1 is constructed by attaching an inclined bottom plate 3 to a vertical peripheral wall 2 having a top plate 4, and the bottom plate 3 of the container 1 is provided with a plurality of ejection pipes that eject a small powder substance serving as a core upward together with gas. 7 is fixed almost vertically through the bottom plate 3, and a frustum-shaped cylinder 8 is provided at the upper end of each of the above-mentioned ejection pipes 7 so as to communicate with the ejection pipe 7 in an upwardly open state. At the center of the upper end of the jet pipe 7, jet nozzles 13 are arranged, respectively, for jetting the molten liquid sent from the liquid sending pipe 10 onto the small powder particles that are jetted upward from the jet pipe 7 and are fluidized and circulated up and down. , above each cylinder 8 is a partition cylinder 1 whose lower part is open.
1 and the cylinder 8 with an overflow port 12 formed therebetween, while a gas discharge port 5 is provided at the top of each partition cylinder 11.
Each of the cylindrical bodies 8 is provided with a supply pipe 9 for supplying small powder particles serving as a nucleus into the cylindrical body 8, and the bottom plate 3 is
A granulation device characterized in that a powder discharge port 6 is provided at the lower end of the granulation device.