Airflow cooling dripping granulation method and system

Abstract

The present invention provides an airflow cooling dripping granulation method, comprising: passing fluid fertilizer raw materials through a distributor to form fertilizer droplets sprayed in a first direction, wherein the angle α between the first direction and the horizontal direction is: 0°<α<180°; rolling the fertilizer droplets in a second direction under the action of the airflow of at least one crossflow fan, and forming fertilizer particles in the rolling process, wherein the angle β between the second direction and the horizontal direction is: 0°≤β<90°, and β<α, and the crossflow fan is located below the distributor. The present invention also provides an airflow cooling dripping granulation system. The present invention changes the movement direction of fertilizer droplets through the airflow of the crossflow fan, and cools and forms fertilizer particles in the rolling process. Compared with the high tower granulation in the prior art, the height of the production equipment can be reduced, and space can be saved. Compared with the flat fertilizer particles formed by cooling the steel belt, the present invention can form spherical fertilizer particles.

Description

Technical Field

[0001] The invention relates to the technical field of fertilizers, and in particular to an airflow cooling dripping granulation method and system. Background Art

[0002] At present, the method of producing fertilizers is basically to use high-tower granulation. The so-called high-tower granulation is to use molten urea and raw materials such as phosphorus and potassium to make a mixed slurry under the condition of full mixing, and spray it down from the top of the high tower. In the process of falling from the high tower, the mixed slurry droplets interact with the air resistance rising from the bottom of the tower, exchange heat with it, and then cool to become granular fertilizer, fall to the bottom of the tower, and then obtain granular compound fertilizer after screening. The purpose of using high-tower granulation is to cool the fertilizer droplets to form particles during the process of falling from a high place, but the construction and maintenance of high towers currently require a large cost, and the environmental protection investment is large. If the high tower is replaced by a low tower, due to the height limitation of the low tower, the fertilizer droplets are not completely cooled or the formed particles do not meet the fertilizer standards. At present, there is a method of using steel belt to cool fertilizer in the industry, that is, the molten fertilizer is knocked onto the steel belt and cooled on the steel belt. Although the steel belt cooling method can reduce the height of the equipment, the fertilizer particles formed are flat and cannot form spherical fertilizer particles. In addition, the fertilizer particles are easily broken when they are knocked onto the steel belt, and the fertilizer of the desired particle size cannot be obtained. Summary of the invention

[0003] In view of this, the present invention provides an airflow cooling dripping granulation method. The specific technical scheme is as follows.

[0004] An airflow cooling dripping granulation method, the airflow cooling dripping granulation method comprising:

[0005] The fluid fertilizer raw material is passed through a distributor to form fertilizer droplets sprayed in a first direction, wherein the angle α between the first direction and the horizontal direction is: 0°<α<180°;

[0006] The fertilizer droplets are rolled in a second direction under the action of the airflow of at least one cross-flow fan, and fertilizer particles are formed during the rolling process, wherein the angle β between the second direction and the horizontal direction is: 0°≤β<90°, and β<α, and the cross-flow fan is located below the distributor.

[0007] In a preferred embodiment, the at least one cross-flow fan includes a first cross-flow fan, the air outlet of the first cross-flow fan is located in the first direction of the distributor spraying fertilizer droplets, the airflow discharged from the air outlet of the first cross-flow fan has a horizontal and a vertical upward component speed, and when the fertilizer droplets fall on the air outlet of the first cross-flow fan, the airflow of the first cross-flow fan reduces the vertical downward dripping speed of the fertilizer droplets and drives the fertilizer droplets to roll in the second direction.

[0008] In a preferred embodiment, the angle α is 80°-90°, and the angle β° is 0-10°.

[0009] In a preferred embodiment, there is a preset vertical distance between the distributor and the first crossflow fan, and the fertilizer droplets have a preset speed when ejected from the distributor; the airflow cooling dripping granulation method also includes:

[0010] The air flow speed of the crossflow fan is determined according to the preset vertical distance and the preset speed, so that the fertilizer droplets can roll in the second direction and keep the fertilizer droplets intact until fertilizer particles are formed.

[0011] In a preferred embodiment, the preset vertical distance is 1-10 meters, the preset speed is greater than the air flow speed, and the air flow speed is 10-50 meters per second.

[0012] In a preferred embodiment, the air flow medium of the cross-flow blower is one or more of air, nitrogen or carbon dioxide gas;

[0013] The air flow of the cross-flow fan has a temperature of 20-40°C.

[0014] In a preferred embodiment, after the airflow of the first crossflow fan reduces the vertical downward dripping speed of the fertilizer droplets, the airflow cooling dripping granulation method further includes:

[0015] The fertilizer droplets after the speed reduction are solidified to form fertilizer particles and then drip onto the cooling belt for further cooling. The time taken for the fertilizer droplets to travel from the distributor outlet to the cooling belt is 2-3 seconds.

[0016] In a preferred embodiment, the airflow cooling dripping granulation method further comprises:

[0017] The fertilizer particles are cooled by a cooling device, which includes a fluidized bed cooling device or a powder flow cooling device.

[0018] The present invention also provides an airflow cooling dripping granulation system, the airflow cooling dripping granulation system comprising:

[0019] A distributor, the distributor is used to form fertilizer droplets sprayed in a first direction through the fluid fertilizer raw material, wherein the angle α between the first direction and the horizontal direction is: 0<α<180;

[0020] At least one cross-flow fan, the at least one cross-flow fan is used to roll the fertilizer droplets in a second direction and form fertilizer particles during the rolling process, wherein the angle β between the second direction and the horizontal direction is: 0≤β<90, and β<α, and the cross-flow fan is located below the distributor.

[0021] In a preferred embodiment, there are multiple crossflow fans, which are arranged in sequence and spaced apart in the horizontal direction, and the air outlets of the multiple crossflow fans face the third direction, so that the airflow discharged from the air outlets of the crossflow fans has a horizontal and a vertical component velocity, and the fertilizer droplets roll in a wave-like manner toward the second direction as a whole under the action of the airflow of the multiple crossflow fans.

[0022] Beneficial effects of the present invention: The airflow cooling dripping granulation method provided by the present invention changes the movement direction of fertilizer droplets through the airflow action of the crossflow fan, and cools in the process of rolling in the second direction to form fertilizer particles. Compared with the high tower granulation in the prior art, it can reduce the height of production equipment and save space. Compared with the flat fertilizer particles formed by steel belt cooling, the method of the present invention can form spherical fertilizer particles.

[0023] The method of the present invention does not require a granulation tower, and the volume and construction cost of the overall device are not large, and the cost is low. The high tower process is difficult to produce fertilizer particles larger than 5 mm due to factors such as the tower height. The method of the present invention can produce relatively large spherical particles and relatively uniform spherical particles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 The present invention provides a flow chart of an airflow cooling dripping granulation method.

[0025] Figure 2 A schematic structural diagram of an airflow cooling dripping granulation system provided in one embodiment of the present invention.

[0026] Figure 3 A schematic structural diagram of an airflow cooling dripping granulation system provided in another embodiment of the present invention. DETAILED DESCRIPTION

[0027] The following is a preferred embodiment of the present invention. It should be noted that a person skilled in the art may make several improvements and modifications without departing from the principle of the present invention. These improvements and modifications are also considered to be within the scope of protection of the present invention.

[0028] See also Figure 1 and Figure 2 The embodiment of the present invention provides a method for dripping granulation by airflow cooling, and the method comprises step S100 and step S200. The specific technical scheme is as follows.

[0029] Step S100, the fluid fertilizer raw material is formed into fertilizer droplets Q sprayed in a first direction A through a distributor 100, and the angle α between the first direction A and the horizontal direction is: 0°<α<180°. The fluid fertilizer raw material refers to a molten fertilizer raw material that can flow by melting the fertilizer raw material at high temperature. In some embodiments, it can also be a flowable fertilizer raw material that can flow by adding a small amount of water or mixing liquid fertilizer with solid fertilizer. The composition of the fluid fertilizer raw material includes at least one of organic fertilizer, inorganic fertilizer, medium and trace element fertilizer, microbial fertilizer, etc., and its specific composition is prepared according to actual production needs.

[0030] In this embodiment, the angle α between the first direction A and the horizontal direction is preferably 80°-90°, and more preferably, the angle α is 90°, that is, the distributor sprays the fertilizer droplets vertically downward.

[0031] Step S200, rolling the fertilizer droplets Q in a second direction B under the action of the airflow of at least one crossflow fan 200, and forming fertilizer particles in the rolling process, wherein the angle β between the second direction B and the horizontal direction is: 0≤β<90, and β<α, and the crossflow fan 200 is located below the distributor 100. The rolling of the fertilizer droplets in the second direction means that the fertilizer droplets as a whole roughly roll in the second direction B. In the actual production process, the fertilizer droplets can be dispersed and roll in the second direction B. Specifically, the rolling direction of each fertilizer droplet has a certain deviation, but all the fertilizer droplets as a whole roughly roll in the second direction B. In this embodiment, the preferred angle β is 0-10°, and the more preferred angle β is 0°. The second direction B is parallel to the horizontal direction, that is, the fertilizer droplets roll in the horizontal direction as a whole. That is to say, in this embodiment, when the fertilizer droplets are ejected from the distributor 100 in a vertically downward direction, the movement direction is changed under the action of the cross-flow fan 200, so that the fertilizer droplets dripping vertically downward slow down and roll in the horizontal direction. During the rolling process, heat is gradually exchanged with the airflow, so that the fertilizer droplets are transformed from a fluid state into solid fertilizer particles, and the fertilizer particles are formed under the cooling of the airflow of the cross-flow fan.

[0032] like Figure 2 In order to reduce the height of the device, two or more groups of crossflow fans are arranged in a staggered manner to meet the heat exchange conditions required for the fertilizer droplets to change from a liquid phase to a solid phase. In this embodiment, there are three crossflow fans 200. In other embodiments, the number of the crossflow fans 200 can be set according to actual conditions, and the specific number is not limited.

[0033] In a further embodiment, the at least one crossflow fan 200 includes a first crossflow fan 210, and the air outlet of the first crossflow fan 210 is located in the first direction A of the distributor 100 spraying the fertilizer droplets Q. When the fertilizer droplets Q fall, they can pass through the air outlet of the first crossflow fan 210 and be blown to the second direction B by the airflow of the first crossflow fan 210. The first crossflow fan 210 refers to the crossflow fan closest to the distributor 100 in the crossflow fan assembly, and is also the first crossflow fan that provides airflow for changing the movement direction of the fertilizer droplets.

[0034] The airflow of the first crossflow fan 210 has a component velocity in the horizontal direction and in the vertical upward direction. When the fertilizer droplets Q fall on the air outlet of the first crossflow fan 210, the airflow of the first crossflow fan 210 reduces the vertical downward dripping velocity of the fertilizer droplets Q and drives the fertilizer droplets Q to roll in the second direction. When the airflow velocity of the first crossflow fan 210 is relatively large, the airflow will reduce the vertical downward component velocity of the fertilizer droplets to zero, and make the fertilizer droplets have a vertical upward velocity, plus the component velocity in the horizontal direction, so that the second direction of the fertilizer droplet rolling has an angle with the horizontal direction. When the fertilizer droplets roll a certain distance in the horizontal direction and are far away from the first crossflow fan 210, the fertilizer droplets are reduced by the airflow of the first crossflow fan 210, so that the rolling velocity is reduced, and even the fertilizer droplets show a downward trend. If the fertilizer droplets have not cooled to form fertilizer particles at this time, the number of crossflow fans can be increased. In this embodiment, there are preferably three crossflow fans, and a second crossflow fan 220 is set at a position where the rolling speed is reduced and even the fertilizer droplets are falling. The airflow from the air outlet of the second crossflow fan 220 blows the fertilizer droplets toward the second direction again to further cool them to form fertilizer particles. The function of the third crossflow fan 230 is the same as that of the second crossflow fan 220. Figure 2 As shown, the fertilizer droplets Q are caused to roll in a wave shape toward the second direction as a whole under the action of the airflow of the cross-flow fan, and are cooled to form fertilizer particles during the rolling process.

[0035] In the present application, the air flow speeds of the first cross-flow fan 210 , the second cross-flow fan 220 , and the third cross-flow fan 230 may be set according to the falling speed of the fertilizer droplets and the size of the fertilizer droplets.

[0036] The airflow cooling dripping granulation method provided by the present invention changes the movement direction of fertilizer droplets through the airflow action of the crossflow fan, and cools in the process of rolling in the second direction to form fertilizer particles. Compared with the high tower granulation in the prior art, the height of the production equipment can be reduced and space can be saved. Compared with the flat fertilizer particles formed by cooling with a steel belt, the method of the present invention can form spherical fertilizer particles.

[0037] The method of the present invention does not require a granulation tower, and the volume and construction cost of the overall device are not large, and the cost is low. Since there is no need for a granulation tower, the tail gas treatment is much easier than that of a high tower. The high tower process is difficult to produce fertilizer particles larger than 5 mm due to factors such as the tower height. The method of the present invention can produce relatively large spherical particles and relatively uniform spherical particles. By replacing different discharge ports of the distributor, spherical particles of different particle sizes can be obtained, making production more convenient.

[0038] exist Figure 2 In the figure, one distributor 100 and three cross-flow fans 200 are shown. In other embodiments, the number of distributors 100 and cross-flow fans 200 can be adjusted according to the specific output to meet different product requirements.

[0039] In a further embodiment, there is a preset vertical distance between the distributor 100 and the first crossflow fan 210, and the fertilizer droplets Q have a preset speed when ejected from the distributor 100; the airflow cooling dripping granulation method further includes:

[0040] The air flow speed of the crossflow fan 200 is determined according to the preset vertical distance and the preset speed, so that the fertilizer droplets Q can roll in the second direction and keep the fertilizer droplets intact until fertilizer particles are formed.

[0041] The airflow of the crossflow fan 200 in the present invention is stable, uniform, and turbulent-free, and the axial length of a plurality of crossflow fans 200 combined is not limited. The length of the impeller in the crossflow fan 200, that is, the width of the airflow, can be arbitrarily selected according to different usage requirements. The crossflow fan has the characteristics of small size, light weight, low noise, and low energy consumption. Its wind pressure and air volume can be achieved according to the user's requirements, and can also be adjusted by frequency conversion during use.

[0042] In the present application, when there is a preset vertical distance between the distributor 100 and the first cross-flow fan 210 and the fertilizer droplets have a preset speed, the airflow speed can be controlled so that the airflow can both hold the fertilizer droplets and move them in the second direction without breaking up the independent fertilizer droplets. The fertilizer droplets after changing direction exchange heat with the airflow delivered by the cross-flow fan 200 during the process of moving in the second direction, and undergo a phase change, while automatically shrinking into a perfect sphere during the phase change.

[0043] In this embodiment, the air flow speed of the crossflow fan can be adjusted by a frequency converter, and the fertilizer droplets falling vertically (in this embodiment, the first direction is vertically downward) will not be broken by the air flow when they come into contact with the air flow of changing direction. Preferably, the air flow discharged by the crossflow fan 200 has a large air volume and a low air flow speed.

[0044] In a further embodiment, the preset vertical distance is 1-10 meters, the preset speed is greater than the air flow speed, and the air flow speed is 10-50 meters per second. The air flow speed refers to the air speed at that time, and the air speed can be monitored in real time when using the method of the present invention.

[0045] In a further embodiment, the distributor comprises a discharge port, the aperture of the discharge port is 1-4 mm. The diameter of the fertilizer droplets produced by the distributor is 1-4 mm.

[0046] In a further embodiment, the air flow medium of the cross-flow blower 200 is one or more of air, nitrogen or carbon dioxide gas.

[0047] In a further embodiment, the airflow of the crossflow fan 200 has a temperature of 20-40° C. Preferably, the airflow temperature of the crossflow fan 200 is 25°.

[0048] In a further embodiment, the airflow cooling dripping granulation method further includes step S300.

[0049] Step S300, cooling the fertilizer particles by a cooling device 300, wherein the cooling device 300 comprises a fluidized bed cooling device 310 (such as Figure 3 as shown) or powder flow cooling device 320 (as shown Figure 2 shown).

[0050] The fertilizer droplets are transformed into solid spherical particles, which are then further cooled by the fluidized bed cooling device or the powder flow cooling device 320. When the particles reach the temperature required by the process, they can enter the next process.

[0051] In another embodiment, after the airflow of the first crossflow fan 210 reduces the vertical downward dripping speed of the fertilizer droplets, the airflow cooling dripping granulation method further includes:

[0052] The fertilizer droplets after the speed reduction are solidified to form fertilizer particles and then dripped onto the cooling belt for further cooling. The time taken for the fertilizer droplets to travel from the outlet of the distributor to the cooling belt is 2-3 seconds. In this embodiment, a combination of a crossflow fan and a cooling belt is used to cool the fertilizer droplets and the fertilizer particles. The crossflow fan can ensure that the fertilizer droplets are cooled into spherical particles, and the cooling belt can further quickly cool the spherical fertilizer particles to improve the compactness of the fertilizer particles. Preferably, the cooling belt is a steel belt, and the cooling temperature of the steel belt is 5-20°.

[0053] See also Figure 2The present invention also provides an airflow cooling dripping granulation system 10, which includes a distributor 100 and at least one crossflow fan 200. The distributor 100 is used to form a fluid fertilizer raw material into fertilizer droplets sprayed in a first direction, and the angle α between the first direction and the horizontal direction is: 0<α<180. The at least one crossflow fan 200 is used to roll the fertilizer droplets in a second direction and form fertilizer particles in the rolling process, wherein the angle β between the second direction and the horizontal direction is: 0≤β<90, and β<α, and the crossflow fan 200 is located below the distributor 100.

[0054] In this embodiment, the angle α between the first direction A and the horizontal direction is preferably 80°-90°, and more preferably, the angle α is 90°, that is, the distributor 100 sprays the fertilizer droplets vertically downward.

[0055] The rolling of the fertilizer droplets in the second direction means that the fertilizer droplets as a whole roll in the second direction B. In the actual production process, the fertilizer droplets can be dispersed and roll in the second direction B. Specifically, the rolling direction of each fertilizer droplet has a certain deviation, but all the fertilizer droplets as a whole roll in the second direction B. In this embodiment, the angle β is preferably 0-10°, and the more preferred angle β is 0°. The second direction B is parallel to the horizontal direction, that is, the fertilizer droplets as a whole roll in the horizontal direction. That is to say, in this embodiment, when the fertilizer droplets are ejected from the distributor in a vertically downward direction, the movement direction is changed under the action of the crossflow fan, so that the fertilizer droplets drop vertically downward The dripping speed slows down and rolls in the horizontal direction, and gradually exchanges heat with the airflow during the rolling process, so that the fertilizer droplets are transformed from a fluid state to solid fertilizer particles, and the fertilizer particles are formed under the airflow cooling of the crossflow fan.

[0056] In a further embodiment, there are multiple cross-flow fans 200, and the multiple cross-flow fans 200 are arranged in sequence at intervals in the horizontal direction. The air outlets of the multiple cross-flow fans 200 are directed toward a third direction C, so that the airflow discharged from the air outlets of the cross-flow fans 200 has component velocities in the horizontal direction and the vertical upward direction, and the fertilizer droplets Q roll in a wave-like manner toward the second direction as a whole under the action of the airflow of the multiple cross-flow fans 200.

[0057] The airflow cooling dripping granulation system provided by the present invention changes the movement direction of the fertilizer droplets through the airflow action of the cross-flow fan 200, and cools and forms fertilizer particles during the rolling process in the second direction. Compared with the high tower granulation in the prior art, it can reduce the height of the production equipment and save space. Compared with the flat fertilizer particles formed by steel belt cooling, the system of the present invention can form spherical fertilizer particles.

[0058] In a further embodiment, the at least one cross-flow fan includes a first cross-flow fan 210 , and an air outlet of the first cross-flow fan 210 is located in a first direction in which the distributor 100 sprays fertilizer droplets.

[0059] In a further embodiment, the at least one crossflow fan further comprises a second crossflow fan 220, which is arranged on one side of the first crossflow fan 210 and is located on the path where the fertilizer droplets roll along the second direction; the air outlet of the first crossflow fan 210 has a first angle with the horizontal direction, and the air outlet of the second crossflow fan 220 has a second angle with the horizontal direction, and the first angle is greater than the second angle. Since the first crossflow fan 210 is the first crossflow fan that changes the path of the fertilizer droplets, the angle between the air outlet of the first crossflow fan 210 and the horizontal direction should be set to be larger so that the fertilizer droplets can roll along the second direction, and the fertilizer droplets that have changed their motion path through the first crossflow fan 210 do not need a larger air flow speed when rolling to the second crossflow fan 220, so the air outlet of the second crossflow fan 220 can be set to be smaller with respect to the horizontal direction.

[0060] In a further embodiment, the distributor comprises a discharge port, and the aperture of the discharge port is 1-4 mm.

[0061] In a further embodiment, the air flow medium of the cross-flow blower is one or more of air, nitrogen or carbon dioxide gas.

[0062] In a further embodiment, the airflow cooling dripping granulation system also includes a cooling device, which is arranged on the side of the last crossflow fan away from the first crossflow fan and is used to cool the fertilizer particles. The cooling device includes a fluidized bed cooling device or a powder flow cooling device.

[0063] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A method for dripping granulation by airflow cooling, characterized in that: The airflow cooling dripping granulation method comprises: The fluid fertilizer raw material is passed through a distributor to form fertilizer droplets sprayed in a first direction, wherein the angle α between the first direction and the horizontal direction is: 0°<α<180°, the distributor comprises a discharge port, the aperture of the discharge port is 1-4 mm, and the diameter of the fertilizer droplets generated by the distributor is 1-4 mm; The fertilizer droplets are rolled in a second direction under the action of the airflow of a plurality of crossflow fans, and fertilizer particles are formed in the rolling process, wherein the angle β between the second direction and the horizontal direction is: 0°≤β<90°, and β<α, the plurality of crossflow fans are located below the distributor, the plurality of crossflow fans are sequentially spaced in the horizontal direction, the air outlets of the plurality of crossflow fans face the third direction, so that the airflow discharged from the air outlets of the plurality of crossflow fans has a component speed in the horizontal direction and vertically upward, and the plurality of crossflow fans include A first cross-flow fan, wherein the air outlet of the first cross-flow fan is located in the first direction in which the distributor sprays fertilizer droplets, and the airflow discharged from the air outlet of the first cross-flow fan has component velocities in the horizontal direction and the vertically upward direction. When the fertilizer droplets fall on the air outlet of the first cross-flow fan, the airflow of the first cross-flow fan reduces the vertically downward dripping speed of the fertilizer droplets and drives the fertilizer droplets to roll in the second direction. Under the action of the airflows of the multiple cross-flow fans, the fertilizer droplets roll in a wave-like manner as a whole in the second direction.

2. The airflow cooling dripping granulation method according to claim 1, characterized in that: The angle α is 80°-90°, and the angle β° is 0°-10°.

3. The airflow cooling dripping granulation method according to claim 1, characterized in that: There is a preset vertical distance between the distributor and the first crossflow fan, and the fertilizer droplets have a preset speed when ejected from the distributor; the airflow cooling dripping granulation method also includes: The air flow speed of the crossflow fan is determined according to the preset vertical distance and the preset speed, so that the fertilizer droplets can roll in the second direction and keep the fertilizer droplets intact until fertilizer particles are formed.

4. The airflow cooling dripping granulation method according to claim 3, characterized in that: The preset vertical distance is 1-10 meters, the preset speed is greater than the air flow speed, and the air flow speed is 10-50 meters per second.

5. The airflow cooling dripping granulation method according to claim 1, characterized in that: The air flow medium of the crossflow fan is one or more of air, nitrogen or carbon dioxide gas; The air flow temperature of the cross-flow fan is 20-40°C.

6. The airflow cooling dripping granulation method according to claim 1, characterized in that: After the airflow of the first crossflow fan reduces the vertical downward dripping speed of the fertilizer droplets, the airflow cooling dripping granulation method further includes: The fertilizer droplets after the speed reduction are solidified to form fertilizer particles and then drip onto the cooling belt for further cooling. The time taken for the fertilizer droplets to travel from the distributor outlet to the cooling belt is 2-3 seconds.

7. The airflow cooling dripping granulation method according to claim 1, characterized in that: The airflow cooling dripping granulation method also includes: The fertilizer particles are cooled by a cooling device, which includes a fluidized bed cooling device or a powder flow cooling device.

8. An airflow cooling dripping granulation system, characterized in that: The airflow cooling dripping granulation system comprises: A distributor, the distributor comprises a discharge port, the aperture of the discharge port is 1-4 mm, the diameter of the fertilizer droplets generated by the distributor is 1-4 mm, the distributor is used to pass the fluid fertilizer raw material through the distributor to form the fertilizer droplets sprayed in a first direction, and the angle α between the first direction and the horizontal direction is: 0°<α<180°; A plurality of crossflow fans are arranged in sequence at intervals in the horizontal direction, the plurality of crossflow fans are located below the distributor, and the air outlets of the plurality of crossflow fans face a third direction so that the airflow discharged from the air outlets of the plurality of crossflow fans has a component speed in the horizontal direction and in the vertical upward direction. The plurality of crossflow fans include a first crossflow fan, the air outlet of the first crossflow fan is located in the first direction of the distributor spraying fertilizer droplets, the airflow discharged from the air outlet of the first crossflow fan has a component speed in the horizontal direction and in the vertical upward direction, when the fertilizer droplets fall on the air outlet of the first crossflow fan, the airflow of the first crossflow fan reduces the vertical downward dripping speed of the fertilizer droplets, and drives the fertilizer droplets to roll in a second direction, and the fertilizer droplets roll in a wave-like manner as a whole in the second direction under the action of the airflow of the plurality of crossflow fans, and form fertilizer particles in the rolling process, wherein the angle β between the second direction and the horizontal direction is: 0°≤β<90°, and β<α.

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