CN200974819Y - Air-cooled crystallization granulating device for full-fusion composite fertilizer - Google Patents

Abstract

The utility model, in the light of existing problems of current low tower granulation such as poor granulation effects, clinging dust to shell and product mixture adjustment difficulty, discloses a cold air crystallization granulation device for full-melt compound fertilizer, good shaping, low investment and adaptable to be used for low tower, which makes the wind emitting from the blower to the tower into a vortex shape through reasonable layout of blower position and angle, making the slurry particles rotating downward on one side to reduce the dropping and cooling time, and enlarging the contacting surface with the cool wind to allow the high temperature particles to drop to the crystallization temperature rapidly for acquiring good particle appearance on the other side.

Description

Air-cooled crystallization granulation device for full-melt compound fertilizer

technical field

The utility model relates to a compound fertilizer granulation device, in particular to an air-cooled crystallization granulation device for full-melt compound fertilizer, in particular to an air-cooled crystallization granulator for full-melt compound fertilizer.

Background technique

In recent years, the production process of producing full-melt compound fertilizer (ie NPK compound fertilizer) in my country has been greatly improved. The process has a series of problems such as low efficiency, poor appearance of the finished product, and high energy consumption. For this reason, people have developed a new tower granulation process. The products produced by this process have a round appearance, accurate and uniform nutrients, and high fertilizer utilization. Once launched That is, a big hit. However, the main problem of this process is that in order to increase the cooling effect, the tower body is mostly more than 100 meters, and the tower diameter is also more than 12. The investment is large, the cost is high, the floor area is large, and the safety requirements are high. It is very difficult to upgrade, and the energy consumption is relatively high. Therefore, people have done a lot of research on tower height and energy consumption. For this reason, Chinese patent 021349711 proposes a low-tower production process and equipment, and Chinese patent 200510038702.X proposes A method and device utilizing freezing granulation are proposed, and they all have creative significance in reducing the height of the tower body. These two methods and devices still have the following problems in actual use: one is that the dust is increased, and the dust is easy to stick to the tower wall, which requires regular shutdown and cleaning; the other is that the appearance of the finished particles is poor, which cannot be compared with the high tower , the particles are easy to stick together; the third is poor adaptability, the formula of the compound fertilizer that can be made by each prilling tower should not change too much, otherwise it will not work normally, and the adjustment of products with different formulas is difficult; the fourth is that the investment is still relatively large. Just because of above-mentioned reasons, cause them to be difficult to popularize and use on a large scale.

Contents of the invention

The purpose of this utility model is to solve the problems of poor granulation effect, easy generation of sticky wall dust and difficult adjustment of product ratio in the existing low-tower granulation. , An air-cooled crystallization granulation device suitable for full-melt compound fertilizers used in low towers.

The technical scheme of the utility model is:

An air-cooled crystallization granulation device for fully molten compound fertilizers, comprising a granulation tower 1, a rotary granulation head 2, a fan 3, and an exhaust fan 4. The tower height of the material tower 1 is 15-50 meters, and the tower diameter is 6-12 meters, the rotary granulation head 2 is installed at the top center of the inner side of the prilling tower 1, and it is characterized in that the exhaust fan 4 is installed on the top of the prilling tower 1 and around the rotary granulation head 2, and the exhaust fan The air inlet of 4 communicates with the inner cavity of the prilling tower 1; 3-5 circles are installed on the prilling tower whose vertical distance from the rotating prilling head 2 is less than 4 meters (including 4 meters), and each circle is composed of several The annular blower group 5 that blower fan 3 is formed, the distance between described annular blower group 5 is 1.5-4 meter;

The included angle α between the air supply direction of the fan 3 and the horizontal plane is 15-45 degrees, and the included angle β with the radial line of the tower at the point is 80-85 degrees.

The exhaust fan 4 is vertically installed on the top of the prilling tower 1, and its quantity is 4-8.

Each circle of annular air supply unit 5 is made up of 20-40 fans 3, and each circle of annular air supply unit 5 is equipped with a frequency conversion speed regulator for uniformly adjusting the air volume.

The utility model has the following advantages:

1. The method of the utility model has compact technology, good product forming, less investment, and low energy consumption. It is produced by installing multiple rows of transverse wind cutting and blowing devices in the middle of the granulation forming tower and installing multiple exhaust devices on the top of the tower. On the other hand, the upward negative pressure quickly discharges excess heat out of the tower, greatly reducing the curing time of compound fertilizer particles, reducing the height and diameter of the granulation forming tower, which can greatly save investment costs and reduce operating costs.

2. Compared with the existing low tower and freezing tower, the investment can be reduced by 50%-70%. At the same time, the production scale can be adjusted according to the needs, which can be large or small.

3. It can produce compound fertilizers with different concentrations of high, medium and low. It is very convenient to change the formula, and the formula ratio range is large. For compound fertilizers with different ratios, the air supply volume can be adjusted through the frequency conversion regulator to adjust the cooling time to an appropriate range to prevent overcooling. and the occurrence of insufficient cooling.

4. There will be no dust sticking to the wall, and there is no need to regularly clean the tower wall. The particles of the compound fertilizer slurry will slowly descend in the tower body in a vortex shape, so that the dust will fall together with the particles, and the current dust phenomenon will not occur.

5. The uniformity of the product is good, the yield rate can be as high as 99%, and the control performance is excellent.

6. It can work under all-weather conditions, which solves the contradiction that the existing process cannot produce normally under high-temperature and high-humidity conditions, and can work normally under high-temperature and high-humidity conditions around the clock.

7. Low energy consumption. On the one hand, the height of the tower is reduced, which reduces the energy consumption of material transportation. On the other hand, energy consumption can be greatly reduced by using energy-saving blowers.

Description of drawings

Fig. 1 is the structural representation of the utility model.

Fig. 2 is a schematic diagram of the installation angle of the fan in the horizontal direction of the utility model.

Detailed ways

The following structural drawings and embodiments further illustrate the utility model.

An air-cooled crystallization granulation device for full-melt compound fertilizer, as shown in Figures 1 and 2, it includes a granulation tower 1, a rotating granulation head 2, a blower fan 3, and an exhaust fan 4. The tower height of the material making tower 1 is It is 15-50 meters, and the tower diameter is 6-12 meters. The rotary prilling head 2 is installed at the top center of the inner side of the prilling tower 1. There are 4 vertically installed around the top of the prilling tower 1 and around the rotary prilling head 2. -8 exhaust fans 4, so that the heat in the tower is discharged, the air inlet of the exhaust fan 4 communicates with the inner cavity of the granulation tower 1; the vertical distance from the rotary granulation head 2 is less than 4 meters (such as the position of 4 meters) 3-5 rings are installed on the granulation tower body of place), and each ring is made up of 20-40 fan 3 annular blower unit 5, and the air supply volume and the air delivery speed of each fan 3 can be according to the kind of compound fertilizer, The cooling speed and output are selected with reference to relevant design manuals, and the distance between the annular air supply units 5 is preferably 1.5-4 meters. In order to obtain the ideal vortex effect, slow down the descending speed of the slurry, and rapidly cool the slurry coming out of the granulation head, the air supply direction of the fan 3 should be reasonably controlled, and the air supply direction of the fan 3 should be in the middle of the horizontal plane. The angle α can be selected between 15-45 degrees, and the angle β between the radial line of the tower at the installation point can be selected between 80-85 degrees. Each annular blower unit 5 has its own air volume regulating device (such as a frequency converter) so as to uniformly adjust the air supply volume.

In addition, the air supply volume during specific implementation can be determined according to the output and tower diameter.

The parts not involved in the utility model are all the same as the prior art.

The method matched with the utility model comprises the following steps:

In the first step, the compound fertilizer slurry in the fully molten state is sprayed from the rotary granulation head located at the top of the prilling tower with a tower height of 15-50 meters and a tower diameter of 6-12 meters;

The second step is to install the first group of cooling fans blowing into the tower around the prilling tower body at a position of less than 4 meters (including 4 meters) from the prilling head, so that the air outlet direction of each fan is in line with the horizontal plane. The included angle is 15-45 degrees, and the direction with the diameter of 80-85 degrees is used to deliver cooling air to the tower. The air supply speed is controlled at 2-10 m/s, and the air pressure is 100-400 Pa to ensure cooling. Speed, and through the reasonable configuration of the fan (that is, adjusting the direction and angle of the fan's air supply), the cooling wind blown by the fan forms a vortex-shaped air curtain in the tower, thereby slowing down the granularity ejected from the rotating granulation head. The descending speed of the slurry makes each surface of the slurry fully contact with the cooling wind sent by the fan, so that the surface crystallizes rapidly; at the same time, an exhaust fan for ventilation and negative pressure is installed on the top of the prilling tower to The heat of the slurry in the tower is quickly drawn out of the tower;

The third step is to set up a set of 1.5-4 meters apart from the first group of cooling fans, and design two or more sets of cooling fans that are the same as the second step, so that the first cooling air After the unit is cooled, the basically formed grains are further cooled, and after settling to the bottom of the tower, granular compound fertilizer is obtained at the bottom of the tower;

In the fourth step, the granular compound fertilizer obtained in the third step above is sent out of the tower through a conveyor belt for natural cooling.

Claims (3)

1. An air-cooled crystallization granulation device for full-melt compound fertilizer, comprising a granulation tower (1), a rotary granulation head (2), a blower fan (3), an exhaust fan (4), the material tower (1) The tower height is 15-50 meters, and the tower diameter is 6-12 meters. The rotary prilling head (2) is installed at the top center position inside the prilling tower (1), and it is characterized in that the exhaust fan (4) is installed At the top of the prilling tower (1) and around the rotating prilling head (2), the air inlet of the exhaust fan (4) communicates with the inner cavity of the prilling tower (1); 3-5 circles are installed on the body of the prilling tower with a distance of 4-10 meters, and each circle is composed of several fans (3) in an annular air supply unit (5). The distance is 1.5-4 meters; the angle α between the air supply direction of the fan (3) and the horizontal plane is 15-45 degrees, and the angle β with the radial line of the tower at the point is 80-85 degrees. 2. The air-cooled crystallization granulation device for full-melt compound fertilizer according to claim 1, characterized in that the exhaust fan (4) is vertically installed on the top of the granulation tower (1), and its number is 4-8 tower. 3. The air-cooled crystallization granulation device for full-melt compound fertilizer according to claim 1, characterized in that each ring-shaped air supply unit (5) is composed of 20-40 fans (3), and each ring-shaped air supply unit (5) ) are equipped with frequency conversion speed regulators for uniform adjustment of air volume.

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