JPS5948137B2 - Rotating drum type granulation dryer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotating drum type granulation and drying apparatus used, for example, in a granular fertilizer manufacturing process.

The granulation and drying steps in the conventional granular fertilizer production process are as shown in FIG.

In order to produce a specified granular fertilizer in the granulator, slurry fertilizer or water, which is used as a binder for granulation, is fed into the granulator 1.

On the other hand, after the granulation and drying steps in the granulator 1 and dryer 2,
The small particles sieved by the sieve 3 and the large particles pulverized by the pulverizer 4 are supplied again to the granulator 1, where they are mixed with the binder and granulated at an appropriate moisture content and temperature.

For some products, such as diammonium phosphate (DAP), ammonia is supplied to the granulator 1 and granulated while performing an additional reaction.

The granulated material produced in the granulator 1 is fed through the next dryer 2 and the dryer 5, where it is dried to a specified moisture content, and then in the sieving process by the sieve 3, the product particle size is classified. .

A part of the classified product and small particles are directly crushed, and large particles are crushed in the crusher 4 and then circulated to the granulator 1 as described above.

The conventional system in which the granulator 1 and dryer 2 are separated into two models has the following problems.

(1) Since it is separated into a granulator and a dryer, the cost of these devices, fan-attached piping, etc. is high.

(2) The granulator is placed on the second floor because it is necessary to supply the granulated material to the dryer, but since it is a heavy object that vibrates, the cost of the building increases.

(3) Since the granulated material has a high moisture content, the chute connecting the granulator and dryer was easily clogged, and the chute had to be constantly monitored, which was problematic.

The present invention has been made in order to solve the above problems, and provides a rotating drum in which a granulation zone and a drying zone are integrally provided in the rotating drum, and the granulated material can be dried in the drying zone in an ideal condition. The present invention provides a granulation and drying device of the following type.

In order to achieve the above object, the present invention provides a rotating drum with a granulation zone and a drying zone integrally, and a weir is provided on the inner peripheral surface of the drum at the boundary between the granulation zone and the drying zone, and the drying zone is 1st, 2nd,
The drying area is divided into a third drying area, and a long plate-shaped glue lid is provided on the inner peripheral surface of each drying area in the axial direction. The lifter has a tap root whose tip is inclined toward the direction of rotation of the drum body.
Each of the third drying zone lids has a tap root bent at a right angle toward the rotating direction of the drum body, and the granulated material passing through the weir is immediately transferred to the first drying zone. The granules are scraped up with a plate-shaped lifter and dried by countercurrent contact with the drying hot air, and the granules, whose stickiness has been reduced by this drying, are composed of tap roots with inclined tips in the second drying area. By being lifted up to a relatively high position by a lifter and then falling, the granules are uniformly dispersed in the air and efficiently dried, and in the third drying zone, the granules with further reduced stickiness are produced; A lifter consisting of a tap root whose tip part is bent at a right angle toward the direction of rotation of the drum can be used to efficiently dry the product by lifting it up to a high position without falling off midway and then dropping it.6 or less of the present invention. A single-cusp embodiment will be described based on the drawings.

2 to 4, the inside of the drum body 11 is divided into a granulation zone 12 and a drying zone 13, and the drying zone 13 is divided into several zones, e.g. Divided into three first to third drying zones 14 to 16, each drying zone 1
Each lifter 1 provided in the axial direction on the inner peripheral surface of 4 to 16
The structures of Nos. 7 to 19 are different from each other.

That is, in the first drying zone 14, the beam cover 17 is formed with a tap root, and in the second drying zone 15, the tip of the beam cover 18 is slightly inclined toward the rotational direction A of the main body 11, and the third beam cover 17 is formed with a tap root. In the drying area 16, the tip of the placing plate of the beam cover 19 is bent at a substantially right angle toward the rotational direction A of the main body 11.

Both ends of the main body 11 are rotatably supported by an inlet chamber 20 and an outlet chamber 21.
A hot air outlet 22 is formed in the upper part of the outlet chamber 21, and a granulated dried material outlet 23 and a hot air outlet 24 are formed in the lower part and side of the outlet chamber 21, respectively, and hot air for drying is sent into the main body 11 from the furnace 25 through the hot air outlet 24. and is discharged through the hot air outlet 22.

A supply pipe 26 that supplies fertilizer slurry for granulation or a binder such as water, and a support pipe 2 that supports this.
7 is inserted into the granulation zone 12 through the inlet chamber 20, and the end of the support pipe 27 on the granulation zone side is as shown in FIG.
As shown in b, a bearing housing 31 has a short shaft 29 attached via a flexible coupling ring 28 supported by a supporter 30 fixed to the inner peripheral surface of the main body 11.
It is held by being supported through a bearing 32.

In addition, a rubber butt 33 is provided on the inner surface of the main body 11 in the granulation zone 12.
is stretched and fixed to the main body 11 only at appropriate locations as shown in FIG. 33 has a flexible structure,
This prevents the granules from sticking to the main body 11.

Further, the return granule chute 35, like the supply pipe 26 and the support pipe 27, is inserted into the granulation zone 12 through the inlet chamber 20, and a return granule inlet 36 is provided in the upper part of the chute 35.

37 is a butterfly-shaped weir provided on the inner peripheral surface of the main body 11 at the boundary between the granulation zone 12 and the drying zone 13.

In some fertilizer brands, such as diammonium phosphate, ammonia is supplied to the rolling layer in the granulator to perform an additional reaction, but in this case, the ammonia is passed through the support pipe 27. It is fed through another pipe 38 attached to.

Binder such as fertilizer slurry or water for granulation and return granules for granulation are quantitatively supplied and mixed into the granulation zone 12 through the supply pipe 26 and the chute 35, and granulated at an appropriate moisture content and temperature for granulation. It is grained.

The granulated material granulated in the granulation zone passes over the weir 37 and moves to the next drying zone 13.

Conventional dryers are generally equipped with a spiral lifter to push the granulated material inside, but this is not necessary in the drying zone 12 of this embodiment, and the granulated material that has passed through the weir 37 is The material is immediately raked up with a straight lifter and dried in countercurrent contact with hot drying air.

1st. The granules that have passed through the drying zone 14 have reduced stickiness and are evenly dispersed in the air in the second and third drying zones 15, 16, and are dried more effectively due to their structure.

After passing through the second and third drying zones 15.degree. 16, the granulated material has a specified moisture content and is discharged from the granulated dry material outlet 23 to the outside of the system.

As described above, the present invention has the following advantages: (1) The device can be made simple, compact, and miniaturized, making operation and maintenance easier, improving operating efficiency, and reducing construction costs.

(2) Since dry air passes through the granulation zone, the drying effect in the granulation zone is high, and it can be used not only for granulation but also as a drying zone.

Therefore, there is no need for a spiral lifter which has a low drying effect, and drying can be performed immediately after granulation.

(3) Drive equipment, support parts such as tire rollers, ducts, chutes, and other accessories with equipment, which were previously installed separately in the granulator and dryer, are integrated and become cheaper.

(4) Conventionally, the granulator was installed on the second floor because it was necessary to feed the granulated material into the dryer, but the construction cost was high because the granulator was a heavy item that vibrated. Compared to conventional granulation and drying equipment, this granulation and drying equipment can be installed on the ground, significantly reducing construction costs.

(5) Granules have a high moisture content, and in the past, the chute leading from the granulator to the dryer frequently clogged, requiring constant monitoring. There are no accidents at all.

(6) Since the granules in the first, second, and third drying zones can be scraped up to a high position within the rotating drum regardless of changes in their stickiness, the granules in each drying zone can be scraped up to a high position within the rotating drum. It is evenly dispersed in the air and dried efficiently.

[Brief explanation of the drawing]

Fig. 1 is a process diagram of a conventional granular fertilizer manufacturing process, Fig. 2 is a process diagram of the present invention, Fig. 3 is a partially cutaway side view of the main part showing an embodiment of the present invention, and Fig. 4 a- a is A-A in Figure 3
, BB, CC and DD sectional views, Figure 5a,
b is a cross-sectional view and rear view showing the support structure of the support pipe, and FIG. 6 is a partial cross-sectional view of the drum body in the granulation area. 11...Drum body, 12...Pelletization zone, 13...Drying zone, 14-16...First, second and third drying zone , 17-19... Lifter, 26... Supply pipe, 27...
・Support pipe, 33...Rubber butt, 35・
...Chute for returning grains, 37...Weir.

Claims (1)

[Claims] 1 A rotating drum is integrally provided with a granulation zone and a drying zone, a weir is provided on the inner peripheral surface of the drum at the boundary between the granulation zone and the drying zone, and the drying zone is used as a first, second, and third drying zone. Each drying zone is divided into two regions, and a plate-shaped glue lid that is long in the axial direction is provided on the inner peripheral surface of each drying zone, with the first drying zone glue lid being the tap root and the second drying zone lifter being the tip. The third drying zone lid is formed by a tap root whose tip part is bent at a nearly right angle toward the rotation direction of the drum body. A rotating drum type granulation drying device characterized by: