JPS5945414B2 - Granular fertilizer manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for producing granular fertilizer using a rotating drum.

The conventional manufacturing process of granular fertilizer is as shown in FIG.

In the granulator 1, non-standard particles classified by the sieve 4 in the subsequent process, such as small particles and crushed granules crushed by the crusher, and depending on the fertilizer brand, a part of the product is transferred to the packet elevator T as circulating paddy. Lifted and supplied.

On the other hand, water or a slurry solution of the product is quantitatively supplied as a granulation binder for these recycled paddy grains.

A rotating drum type or disk type granulator is generally used for fertilizer granulation, and inside the machine, the above-mentioned circulating rice and water or slurry are mixed and granulated at an appropriate moisture content.

The granulated material from the granulator 1 is supplied to the next dryer 2.

As the dryer 2, a rotating drum dryer is used in most cases, and the granulated material is dried here with hot air or dry air to a specified product content.

The granulated dried material from the dryer 2 is supplied to a sieving machine 4 by a packet elevator 3.

In most cases, the sieving machine 4 for producing granular fertilizer uses an electromagnetic or motor-type vibrating sieve, and the granules are classified into product sizes here, and large particles are crushed in the crusher 5. Later, small grains are directly transferred to conveyor 6 as circulating paddy.
, and is circulated to the granulator 1 through the packet elevator 7.

Note that 8 is a cyclone.

However, the above manufacturing apparatus has the following problems.

(1) Since the granulation, drying, and sieving processes are each carried out using dedicated machines, connecting conveyors, packet conveyors, etc. are required, making the main manufacturing process complicated.

(2) Accidents are likely to occur because the equipment used in these main processes handles powder, and the annual operating rate is relatively low compared to plants that handle gas and fluids.

(3) Heavy rotating machines such as granulators and sieving machines, and vibrating machines need to be installed on the second or third floor due to the manufacturing process, so the building is relatively small compared to other plants. Thick (and construction costs are high).

(4) Due to the manufacturing process, it is necessary to transport and process dried products and recycled paddy to a relatively high place, so power consumption is large compared to other plants.

The present invention is intended to solve the above-mentioned problems, and therefore, the granular fertilizer manufacturing apparatus of the present invention has a granulation zone, a drying zone, and a screen for classifying particles according to the particle size in the rotating drum body around the outside of the body. A cover is provided in series with a sieve zone in the section, and an integrated cover is provided that covers the sieve zone and has an outlet for taking out the classified particles as fine powder, product, and coarse powder. A pulverizer is connected to the drum, and the particles pulverized by the pulverizer and the particles taken out from the fine powder outlet are circulated and supplied to the granulation area of the drum body. Not only that, but also the classification of particles according to their diameter can be performed with a single rotating drum, simplifying the equipment and greatly reducing initial costs and running costs.

An embodiment of the present invention will be described below based on the drawings.

In FIG. 2, reference numeral 11 denotes a rotating drum type granulation, drying, and sieving device, and the functions that are conventionally divided into granulation, drying, and sieving operations are all performed by one device 11 installed on the ground. The inside of the drum body 12 of the apparatus 11 is divided into a granulation zone 13, a drying zone 14, and a sieving zone 15.

The drying area 14 further includes, for example, three first to third drying areas 16.
-18, and lifters 19-21 are provided in the axial direction on the inner peripheral surface of each drying zone 16-18, and each lifter 1
9 to 21 are each area 16 to 18 as shown in Figure 3 a"e.
A buried plate-shaped weir 22 is provided on the inner peripheral surface of the main body 12 at the boundary between the granulation zone 13 and the drying zone 14.

As shown in FIG. 4, the sieving area 15 is provided with slots 23 having appropriate lengths in the axial direction at appropriate intervals in the circumferential direction, for example, in two stages in the axial direction. On the outer periphery of the corresponding main body 12, screens 24 and 25 having different mesh openings depending on the particle size to be sieved are attached by mounting plates 26, and behind the slots 23 are a raking plate 27 and a grid. 28 are provided.

Reference numeral 29 denotes a cover integrally provided to cover the outer periphery of the main body of the sieving area 150, and a fine powder outlet 30, a product outlet 31, and a coarse particle outlet 32 are formed at positions corresponding to the screens 24, 25 and the grid 28, respectively. A hot air or dry air outlet 33 is provided at a position corresponding to the rear end.

34 is an exhaust gas outlet connected to a cyclone 35.

In the granulation zone 13 of the drum body 12, there are particles that are classified in the sieve zone 15 in the subsequent process, that is, small particles, and the crusher 3.
The crushed grains crushed in step 6 and a part of the product depending on the brand of fertilizer are lifted up by a packet elevator 37 and supplied through a chute 38 as circulating paddy.

On the other hand, water or a slurry solution of the product is quantitatively supplied through the supply pipe 39 as a granulation binder for the recycled paddy.

The granulated material, which is granulated in the granulation zone 13 at a moisture content and temperature suitable for granulation, passes over the weir 22 and moves to the drying zone 14.

The moving granules are scraped up by lifters 19 to 21 and dried.

The dried granulated material enters the sieving area 15 while rolling on the inner surface of the main body 12, and only the fine powder passes through the screen 24 at the first stage δ slot 23 and is taken out from the fine powder outlet 30.

Next, the standard size product passes through the screen 25 in the next slot 23 and is taken out from the product outlet 31.

Finally, the coarse grains and lumps that did not pass through the screens 24 and 25 are scraped up by the scraping plate 27 and dropped onto the grid 28, and the coarse grain outlet 32 is also taken out and crushed by the crusher 36.

A portion of the mass is crushed when it falls onto the grid 28,
The load on the coarse grain crusher 36 is reduced.

The small particles taken out from the fine powder outlet 30 and the crusher 36
Depending on the brand of fertilizer, the crushed granules crushed in
7 and supplied to the granulation zone 13.

As described above, the present invention has the following advantages.

(1) The process becomes simpler.

Conventional granulators, dryers, and sieves can be replaced with a single rotary drum type granulation, drying, and sieving device, which not only simplifies the process, but also reduces the need for conveyors, packet elevators, etc. to connect these devices. This simplifies the process, reduces capital investment, and improves operation and annual operating rates.

(2) The size of the building can be reduced.

According to conventional manufacturing methods, equipment was generally installed in the building, such as a granulator on the second floor, a dryer on the first floor, and a sieve machine on the third floor, but in the present invention, only one machine is installed. Only the entrance and exit can be installed inside the building, while the body can be installed outdoors.The building can be lowered and the area of the building can be greatly reduced.

Furthermore, since heavy rotating machines and vibrators such as conventional granulators and sieves are not installed on the second and third floors, construction-related costs can be greatly reduced.

(3) Electricity consumption can be reduced.

There is no need to transport the granulated material and circulating paddy to a high place as in the past, so electricity consumption can be reduced and an energy-saving plant can be constructed.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is a block diagram of a conventional granular fertilizer manufacturing device, Fig. 2 is a block diagram of the present invention, and Fig. 3 a''-c are A-A in Fig. 2.
, BB and CC sectional views, and FIG. 4 is a partially detailed sectional view of the rotating drum. 11... Rotating drum type granulation drying sieving device, 12
......Drum body, 13...Pelletization area, 1
4...Drying area, 15...Sieving area, 24
, 25...Screen, 26...Crusher, 28...Grid, 29...Cover integrated, 30...Fine powder outlet, 31... Product outlet, 32... Coarse particle outlet, 36...
Grinding machine, 37...Packet rubeta, 40...
...conveyor.

Claims (1)

[Claims] 1 A granulation zone, a drying zone, and a sieve zone having a screen on the outer periphery of the main body for classifying particles according to particle size are successively provided in the rotating drum body, and the sieve zone is covered and the classified particles are separated. A cover unit is provided having an outlet for taking out at least fine powder, product, and coarse particles, respectively, and a crusher is connected to the coarse particle outlet, and the particles crushed by the crusher and the particles taken out from the fine powder outlet are A granular fertilizer manufacturing device characterized by being configured to circulate and supply to a granulation area of a drum body.