CN115999432A - Production device and method for urea granule product - Google Patents

Abstract

The invention relates to the technical field of urea production, in particular to a production device for urea granule products, which includes a melting tank and a processing cylinder that can be connected up and down. The cylinder is equipped with a feed pipe for conveying granular urea, and the outlet is aligned with the receiving hopper. A shaking mechanism is installed on both sides of the receiving hopper. The processing cylinder is provided with a discharge pipe with a valve under the receiving hopper. In the present invention, the receiving bucket is reciprocally shaken by a shaking mechanism, and the medium granular urea is shaken and turned over, so that the medium granular urea fully contacts the urea droplet, and the prepared large particles are regular and uniform.

Description

A kind of production device and method of urea granular product

technical field

The invention relates to the technical field of urea production, in particular to a production device and method for urea granular products.

Background technique

Urea is a high-quality nitrogen fertilizer widely used in agriculture. Compared with other nitrogen fertilizers, urea has a high effective nutrient concentration (nitrogen content ≥ 46%), has a certain hygroscopicity, and has no adverse effects on the soil for long-term use. With the improvement of agricultural mechanization, farmers' awareness of large granular urea and medium granular urea is gradually increasing, and the application ratio and market demand are increasing year by year. Granular products have become an important direction of technology research and development.

Patent No. CN109437984B discloses a production device and operating process for converting large urea particles into medium particles. It generates particles of different sizes from the urea solution under the action of fluidizing air through a combined granulation drum, and the sieve passes through the conveying pipeline. Connected with the combined granulation drum, the sieve includes a mixing chamber, an isolation channel, and a filter chamber. The mixing chamber includes a rotating shaft, a dispersing rod, a sleeve, a rotating rod, and a dispersing grid. A filter plate and a second filter plate, the crusher includes a crushing roller, a hydraulic rod, a pressure relief member, a fixed plate 1, a fixed plate 2, and a screw, and the cooler is connected to the mixing chamber, the filter chamber, and the crusher through a conveying channel, respectively. The tail gas processor is used to collect the waste gas generated by the process, and the monitor includes an A/D converter, a control unit, a data quantification analysis unit, and a power supply unit for real-time monitoring of the process.

The above-mentioned device combines the granulation drum to generate particles of different sizes from the urea solution under the action of fluidizing air, but the device cannot shake the medium-sized urea during processing, resulting in the atomization of fine droplets of the urea solution. Dropping at one position causes medium-sized urea to contact fine droplets on one side for a long time, which reduces processing efficiency and quality. At the same time, the size of the feeding port cannot be adjusted during use, resulting in a fixed caliber for granular feeding and poor applicability.

In view of this, the invention discloses a production device for urea granular products.

Contents of the invention

The purpose of the present invention is to provide a production device for urea granule products, which realizes that by installing a melting tank, an atomizing pump, a shaking mechanism and an adjusting mechanism, the melting tank is used in conjunction with the atomizing pump to atomize urea into fine droplets , the crystallization is solidified on the medium granular urea above the receiving bucket inside the processing cylinder, and at the same time, the receiving bucket is reciprocally shaken by the shaking mechanism, and the medium granular urea is shaken and turned over, so that the medium granular urea can fully contact the urea droplet and process at the same time After completion, it is discharged through the discharge port, and the adjustment mechanism inside the discharge port can adjust the opening size of the discharge port to realize the discharge of urea particles with different particle sizes, which improves the practicability and applicability.

The basic idea of the technical solution of the present invention is as follows:

A kind of production device of urea granule product, comprises the processing cylinder that can be communicated with melting tank, and described processing cylinder is positioned at the below of described melting tank; The inside of described processing cylinder is installed to be used for holding the receiving hopper of medium granule urea, so The processing cylinder is provided with a feed pipe for transporting granular urea. The outlet of the feed pipe is located above the receiving bucket. Shaking mechanisms are installed on both sides of the receiving bucket. A discharge pipe with a valve is arranged below.

As an example, the top of the processing cylinder is connected with a cylinder cover, a number of support rods are arranged between the bottom of the melting tank and the cylinder cover, and a feeding pipe connecting the melting tank and the processing cylinder is provided;

A sealing plate is installed under the cylinder cover, and the feeding pipe runs through the cylinder cover and the sealing plate in turn until it extends into the processing cylinder and is connected with an atomizing pump at the lower end.

As an example, the shaking mechanism includes a shaking tank, a first motor and a transmission plate, the shaking tank is set on both sides inside the processing cylinder, and the first motor is installed on one side of the inside of the shaking tank. Below, the power output shaft of the first motor is connected to the transmission disc, the disc surface of the transmission disc is connected to one end of the first connecting rod, the other end of the first connecting rod is connected to one end of the second connecting rod, and the second connecting rod is connected to the other end of the second connecting rod. The other end of the connecting rod is connected to one end of the connecting rod, and the other end of the connecting rod is connected to both sides of the receiving bucket.

Preferably, one end of a limiting rod is installed on the outside of the second connecting rod, a limiting groove is opened on the right side inside the shaking groove, and the other end of the limiting rod is connected inside the limiting groove.

As an example, an adjustment mechanism is installed inside the receiving bucket, and the adjusting mechanism includes a discharge port, a second motor and a mounting slot, the discharge port is opened inside the receiving bucket, and the mounting slot Set on the inner side of the feeding port, the second motor is installed at the right axis inside the installation groove, the power output shaft of the second motor is connected with a screw, and the outer thread of the screw is connected with a screw. One end of the adjusting sleeve rod is connected to the outer left side of the screw sleeve, and the adjusting sleeve rod is integrally sleeved on the outside of the screw rod, and the other end of the adjusting sleeve rod is connected to a sealing plug, and the sealing plug One end of the adjusting plate is connected to the outer side, and a sealing groove is opened on the inner side of the discharge port at the mirror image position of the installation groove, and the other end of the adjusting plate is plugged into the sealing groove.

As an example, two sides of the inside of the installation groove are provided with sliding grooves, one end of the sliding block is slidably connected to the inside of the sliding groove, and the other end of the sliding block is connected to both sides of the screw sleeve.

As an example, the outer side of the feeding tube is wrapped with a heating wire, and the outer side of the heating wire is wrapped with a heat insulation layer.

As an example, it also includes a formaldehyde gas tank arranged outside the processing cylinder, the formaldehyde gas tank is connected with an air pump, one end of the delivery pipe is connected above the air pump, and the other end of the delivery pipe extends to the receiving port inside the processing cylinder. Below the bucket, an air distribution structure is set.

The present invention provides a method for producing urea granules, which is characterized in that the production method is carried out in the production device according to any one of the above contents.

As an example, the method includes the steps of:

Put the urea solution with a mass concentration of 85-95% and a temperature of 75-100°C through the feeding pipe, and spray it on the medium granular urea on the receiving bucket by the atomizing pump;

At the same time, start the shaking mechanism to turn over the medium granular urea on the receiving bucket;

After the feeding of the urea solution is completed, close the shaking mechanism, let it stand still, and discharge the material.

As an example, when the shaking mechanism is started, formaldehyde gas is introduced into the gas distribution structure arranged under the receiving bucket, and the medium-sized urea on the receiving bucket is stirred by gas disturbance.

Preferably, 0.2% to 0.6% of thiourea and 0.1% to 0.3% of cyclodextrin are added to the urea solution.

Compared with prior art, the beneficial effect of the present invention is:

The invention is equipped with a melting tank, an atomizing pump, a shaking mechanism and an adjusting mechanism. First, the melting tank is used in conjunction with the atomizing pump to atomize the urea into fine droplets, crystallize and solidify the medium-sized urea above the receiving bucket inside the processing cylinder At the same time, the receiving bucket is shaken back and forth through the shaking mechanism, and the medium granular urea is shaken and turned over, so that the medium granular urea fully contacts the urea droplets. At the same time, after the processing is completed, it is discharged through the discharge port. The adjustment inside the discharge port The mechanism can realize the adjustment of the opening size of the feeding port, realize the discharge of urea particles with different particle sizes, realize control, and improve the practicability and applicability.

The appearance of the large-grained urea produced by the device of the present invention is smooth and round, which improves the appearance quality of the large-grained urea, and when used to prepare sustained-release modified urea particles, it is beneficial to improve the efficiency of later processes such as coating and enhance market competitiveness.

Description of drawings

Fig. 1 is the overall schematic diagram of the production device of a kind of urea granular product of the present invention;

Fig. 2 is the structural representation of the adjustment mechanism of the production device of a kind of urea granule product of the present invention;

Fig. 3 is a structural schematic diagram of a shaking mechanism of a production device for urea granular products according to the present invention.

Marked in the figure:

1. Processing cylinder; 2. Shaking mechanism; 201, shaking groove; 202, transmission plate; 203, first motor; 204, limit groove; 205, connecting rod; 206, second connecting rod; 207, first connecting rod ; Screw sleeve; 309, chute; 310, adjusting sleeve rod; 311, sealing plug; 4, feeding pipe; 5, cylinder cover; 6, heating wire; 7, feeding pipe; 8, support rod; 9, atomization Pump; 10, sealing plate; 11, melting tank; 12, sealing ring; 13, tank cover; 14, connecting column; 15, base; 16, discharge pipe; 17, receiving bucket; 18, heat insulation layer; 19, Control valve; 20, formaldehyde gas tank; 21, air pump; 22, delivery pipe; 23, gas distribution structure.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The particle size of the medium granular urea in the present invention is 1.18mm~3.35mm, and the urea granular product is large granular urea with a particle size of 2.00mm~4.75mm or 5 mm~8mm.

Example 1

As shown in FIGS. 1-3 , a production device for urea granular products includes a processing cylinder 1 and a melting tank 11 , and the processing cylinder 1 is arranged below the melting tank 11 .

Specifically, as an example, a tank cover 13 is installed on the top of the melting tank 11 , the tank cover 13 is installed and fixed through a connecting column installed on the left side of the top of the melting tank 11 , and a sealing ring 12 is installed below the tank cover 13 .

The bottom of the processing cylinder 1 is provided with a base 15, the upper left side of the processing cylinder 1 is connected with a feed pipe 4 for supplying medium granular urea, the lower right side of the processing cylinder 1 is connected with a discharge pipe 16, and the discharge pipe 16 is equipped with Control valve 19. The control valve 19 can not only control the discharge, but also ensure that there will be no leakage when the gas is injected into the lower part of the processing cylinder 1 later.

The inside of the processing cylinder 1 is equipped with a receiving bucket 17 for placing medium granular urea, the outlet of the feed pipe 4 is located above the receiving bucket 17, and a shaking mechanism 2 for shaking the receiving bucket 17 is installed on both sides of the receiving bucket 17.

A manual valve or an electric valve can be set on the feeding pipe 4, and conventional settings can be adopted, and the present invention does not provide a view.

As shown in Figure 3, as an example, the shaking mechanism 2 includes a shaking groove 201, a first motor 203 and a transmission plate 202, the shaking groove 201 is opened on both sides of the inside of the processing cylinder 1, and the first motor 203 is installed in the shaking groove 201 Below the inner side, the power output shaft of the first motor 203 is connected to the transmission disc 202, the disc surface of the transmission disc 202 is connected to one end of the first connecting rod 207, and the other end of the first connecting rod 207 is connected to the second connecting rod 206. One end, the other end of the second connecting rod 206 is connected with one end of the connecting rod 205, and the other end of the connecting rod 205 is connected to both sides of the receiving bucket 17, and the first motor 203 can drive the transmission disc 202 to rotate, driving the first connecting rod 207 follows the rotation, and the first connecting rod 207 drives the second connecting rod 206 to follow the movement when the first connecting rod 207 rotates. At the same time, the limiting rod 208 on the outside of the second connecting rod 206 slides inside the limiting groove 204 to realize the rotation of the second connecting rod 206. Restriction, the second connecting rod 206 reciprocates up and down inside the shaking tank 201, drives the connecting rod 205 and the receiving bucket 17 to reciprocate shaking, and realizes shaking and turning over the urea particles in the centered particles.

The outer side of the second connecting rod 205 is connected to one end of the limit rod 208, and the inner right side of the shaking groove 201 is provided with a limit groove 204, and the other end of the limit rod 208 is connected to the inside of the limit groove 204, and the limit rod 208 is in the limit position. The position groove 204 slides inside to realize the restriction of the rotation of the second connecting rod 206 .

As shown in Figure 2, the interior of the receiving bucket 17 is equipped with an adjustment mechanism 3, the adjustment mechanism 3 includes a discharge opening 301, a second motor 305 and a mounting groove 304, the discharge opening 301 runs through the inside of the receiving bucket 17, and the installation groove 304 is set on the inner side of the feeding port 301, and the second motor 305 is installed at the right axis of the installation groove 304. The power output shaft of the second motor 305 is connected with a screw 306, and the outer thread of the screw 306 is connected with a screw sleeve 308. The outer left side of the screw sleeve 308 is connected to one end of the adjusting sleeve rod 310, and the adjusting sleeve rod 310 is integrally sleeved on the outside of the screw rod 306, and the other end of the adjusting sleeve rod 310 is connected to a sealing plug 311, and the outer side of the sealing plug 311 is connected to the adjusting plate 303 At one end, the inner side of the feeding port 301 is located at the mirror image position of the installation groove 304 and is provided with a sealing groove 302, and the other end of the adjustment plate 303 is plugged into the inside of the sealing groove 302, and the second motor 305 can drive the screw rod 306 to rotate, so that the screw rod 306 can drive The outer screw sleeve 308 rotates, while the sliders 307 on both sides of the screw sleeve 308 slide inside the chute 309 to limit the rotation of the screw sleeve 308, and the screw sleeve 308 moves outside the screw rod 306 to drive the adjustment sleeve rod 310 Following the movement, when the adjusting sleeve rod 310 moves, it drives the sealing plug 311 and the adjusting plate 303 to move, and the adjusting plate 303 adjusts the size of the feeding opening 301 .

The inside two sides of installation groove 304 are provided with chute 309, and the inside of chute 309 slides and connects one end of slide block 307, and the other end of slide block 307 is connected on both sides of described screw sleeve 308, and slide block 307 slides inside chute 309 , to limit the rotation of the screw sleeve 308 .

As an example, the top of the processing cylinder 1 is provided with a cylinder cover 5, and two or more support rods 8 are arranged between the bottom of the melting tank 11 and the cylinder cover 5, and a feeding pipe connecting the melting tank 11 and the processing cylinder 1 is provided. 7.

As an example, specifically, a sealing plate 10 is installed under the cylinder cover 5, and one end of the feeding pipe 7 is connected to the lower axis of the melting tank 11, and the other end of the feeding pipe 7 extends through the cylinder cover 5 and the sealing plate. 10 until it stretches into the inside of the processing cylinder 1, and is connected with an atomizing pump 9 at the lower end.

The melting tank 11 is used in conjunction with the atomizing pump 9 to atomize the urea into fine droplets and drop down, then fall into the receiving bucket 17, and crystallize and solidify on the medium-sized urea placed above the receiving bucket 17, and at the same time pass through the shaking mechanism 2 The receiving bucket 17 is reciprocally shaken, and the medium granular urea is shaken and turned over, so that the medium granular urea fully contacts the urea droplets, so as to form uniform large granular urea.

After the processing is completed, it is discharged through the discharge port 301. The adjustment mechanism 3 inside the discharge port 301 can adjust the opening size of the discharge port 301 to meet the discharge of urea particles of different particle sizes, which improves the practicability and applicability.

As an optimization scheme, a formaldehyde gas tank 20 is further provided. The formaldehyde gas tank 20 is connected to an air pump 21. A delivery pipe 22 is arranged above the air pump 21. One end of the delivery pipe 22 is connected to the air pump 21, and the other end extends to the inside of the processing cylinder 1. Below the bucket 17, an air distribution structure 23 is provided.

Preferably, when the shaking mechanism 2 is activated, formaldehyde gas is introduced into the air distribution structure 23 provided under the receiving bucket 17 to perform gas disturbance and stirring on the medium-sized urea on the receiving bucket 17, so as to promote the formation of large-sized urea and facilitate the formation of a more beautiful The appearance is more regular and smooth, which improves the processing efficiency and quality.

Further, as an optimized example, the outer side of the feeding pipe 7 is wrapped with a heating wire 6, and the outer side of the heating wire 6 is wrapped with a heat insulating layer 18, which ensures that the melted liquid in the melting tank 11 will not solidify when it flows down, and improves the Processing quality. A thermal insulation layer 18 is provided outside the heating wire 6 to reduce heat loss.

Example 2

Based on the device described in Example 1.

A kind of method of urea granular product of the present invention:

When in use, first put the urea solution with a mass concentration of 85-95% and a temperature of 75-100°C through the feeding pipe 7, and then spray the urea solution above the inside of the processing cylinder 1 by the atomizing pump 9 and land on the The outer side of the medium granular urea is crystallized and solidified. At the same time, the first motor 203 is energized by an external power supply. The first motor 203 can drive the transmission plate 202 to rotate, and drive the first connecting rod 207 to follow the rotation. When the first connecting rod 207 rotates, it drives the second The connecting rod 206 follows the movement, while the limit rod 208 on the outside of the second connecting rod 206 slides inside the limit groove 204, so that the rotation of the second connecting rod 206 is limited, and the second connecting rod 206 moves inside the shaking groove 201. The up and down reciprocating movement drives the connecting rod 205 and the receiving bucket 17 to vibrate back and forth, and vibrates and turns the urea granules in the middle.

Preferably, formaldehyde gas is introduced into the air distribution structure 23 provided below the receiving bucket 17 while the shaking mechanism 2 is started, so as to disturb the medium granular urea on the receiving bucket 17 . In this way, the surface of the particles is fine-tuned and reshaped with the help of formaldehyde gas, and the appearance of the particles is smoother and more uniform. When used as a raw material for the preparation of sustained-release modified urea, it can shorten the time of the overall process and improve the efficiency, such as the time of coating and other processes.

When blanking, the second motor 305 is energized by an external power supply, and the second motor 305 drives the screw 306 to rotate, so that the screw 306 drives the outer screw sleeve 308 to rotate, while the slide blocks 307 on both sides of the screw sleeve 308 are inside the chute 309 Sliding, the rotation of the screw sleeve 308 is restricted, and the screw sleeve 308 moves outside the screw rod 306, driving the adjustment sleeve rod 310 to follow the movement, and when the adjustment sleeve rod 310 moves, it drives the sealing plug 311 and the adjustment plate 303 to move, and the adjustment plate 303 The size of the feeding port 301 is adjusted to limit the size of the particles, which are finally discharged through the discharge pipe 16 .

The surface of the obtained large granular urea is smooth and regular, and the uniformity is good, and the particle size of the large granular urea is 2.00mm~4.75mm≥92% or 5 mm~8mm≥92%.

Example 3

The difference from Example 2 is only that the urea solution with a mass concentration of 80% and a temperature of 110° C. is used, and the others remain unchanged.

The surface smoothness, regularity and uniformity of the large granular urea obtained are slightly inferior to those of Example 2, wherein the particle size of the large granular urea is 2.00 mm ~ 4.75 mm > 90% or 5 mm ~ 8 mm > 90%.

Example 4

The difference from Example 2 is only that the urea solution with a mass concentration of 97% and a temperature of 70° C. is used, and the others remain unchanged.

The surface smoothness, regularity and uniformity of the large granular urea obtained are slightly inferior to that of Example 2, wherein the particle size of the large granular urea is 2.00mm ~ 4.75mm > 85% or 5 mm ~ 8mm > 85%.

Example 5

The difference from Example 2 is only that 0.3% thiourea and 0.2% cyclodextrin are further added to the mass of the urea solution, and the others remain unchanged.

The surface smoothness, regularity and uniformity of the large granular urea obtained are slightly better than that of Example 2, wherein the particle size of the large granular urea is 2.00mm ~ 4.75mm > 95% or 5 mm ~ 8mm > 95%. And also improve 20% than the fertilizer efficiency of the large granular urea of embodiment 2.

Example 6

The difference from Example 2 is only that 0.6% thiourea and 0.1% cyclodextrin are further added to the mass of the urea solution, and the others remain unchanged.

The surface smoothness, regularity and uniformity of the large granular urea obtained are slightly better than that of Example 2, wherein the particle size of the large granular urea is 2.00 mm ~ 4.75 mm > 93% or 5 mm ~ 8 mm > 93%. And also improve 35% than the fertilizer efficiency of the large granular urea of embodiment 2.

The above content is a further detailed description of the present invention in conjunction with specific embodiments. It cannot be determined that the specific implementation of the present invention is limited to these descriptions. For those of ordinary skill in the technical field of the present invention, without departing from the concept of the present invention. Several simple inferences or substitutions can also be made, all of which should be deemed to belong to the protection scope determined by the submitted claims of the present invention.

Claims (10)

1. A production device for urea granule products, characterized in that: it comprises a communicateable processing cylinder (1) and a melting tank (11), and the processing cylinder (1) is located below the melting tank (11); The inside of the processing cylinder (1) is equipped with a receiving bucket (17) for holding medium granular urea, and the processing cylinder (1) is provided with a feeding pipe (4) for conveying medium granular urea, and the feeding pipe (4 ) outlet is located above the receiving bucket (17), shaking mechanisms (2) are installed on both sides of the receiving bucket (17), and the processing cylinder (1) is set below the receiving bucket (17) Outlet tube with valve (16). 2. The production device of urea granules according to claim 1, characterized in that: the top of the processing cylinder (1) is connected with a cylinder cover (5), and the bottom of the melting tank (11) is connected to the A number of support rods (8) are arranged between the cylinder covers (5) and a feeding pipe (7) connecting the melting tank (11) and the processing cylinder (1) is provided; A sealing plate (10) is installed under the cylinder cover (5), and the feeding tube (7) runs through the cylinder cover (5) and the sealing plate (10) in turn until it extends into the processing cylinder (1) and The lower end is connected with an atomizing pump (9). 3. A production device for urea granular products according to claim 1, characterized in that: the shaking mechanism (2) includes a shaking tank (201), a first motor (203) and a transmission disc (202), the The shaking tank (201) is provided on both sides of the inside of the processing cylinder (1), the first motor (203) is installed below one side of the inside of the shaking tank (201), and the first motor (203 ) is connected to the transmission disc (202), the disc surface of the transmission disc (202) is connected to one end of the first connecting rod (207), and the other end of the first connecting rod (207) is connected to the second connecting rod ( 206), the other end of the second connecting rod (206) is connected to one end of the connecting rod (205), and the other end of the connecting rod (205) is connected to both sides of the receiving bucket (17); Preferably, one end of the limiting rod (208) is installed on the outer side of the second connecting rod (205), a limiting groove (204) is opened on the right side inside the shaking groove (201), and the limiting rod ( The other end of 208) is connected inside the limiting groove (204). 4. A production device for urea granule products according to claim 1, characterized in that: an adjustment mechanism (3) is installed inside the receiving bucket (17), and the adjustment mechanism (3) includes a discharge port ( 301), the second motor (305) and the installation slot (304), the discharge port (301) is opened inside the receiving bucket (17), the installation slot (304) is provided in the discharge inside the mouth (301), the second motor (305) is installed at the right axis inside the installation groove (304), and the power output shaft of the second motor (305) is connected with a screw (306), The outer thread of the screw (306) is connected with a screw sleeve (308), the outer left side of the screw sleeve (308) is connected with one end of the adjusting sleeve rod (310), and the adjustment sleeve rod (310) is integrally sleeved On the outer side of the screw (306), the other end of the adjusting sleeve rod (310) is connected with a sealing plug (311), and the outer side of the sealing plug (311) is connected with one end of the adjusting plate (303), and the lower A sealing groove (302) is opened inside the material opening (301) at the mirror image position of the installation groove (304), and the other end of the adjusting plate (303) is plugged into the sealing groove (302). 5. The production device of urea granules according to claim 4, characterized in that: there are chutes (309) on both sides inside the installation groove (304), and the inside of the chute (309) slides One end of the slider (307) is connected, and the other end of the slider (307) is connected to both sides of the screw sleeve (308). 6. A production device for urea granules according to claim 1, characterized in that: the outer side of the feeding pipe (7) is wrapped with a heating wire (6), and the outer side of the heating wire (6) is wrapped with heat insulation layer (18). 7. A production device for urea granules according to any one of claims 1-6, characterized in that it further comprises a formaldehyde gas tank (20) arranged outside the processing cylinder (1), the formaldehyde gas tank (20) An air pump (21) is connected, one end of the delivery pipe (22) is connected above the air pump (21), and the other end of the delivery pipe (22) extends to the receiving bucket (17) inside the processing cylinder (1) and set the air distribution structure (23). 8. A method for urea granule product, characterized in that, the production method is carried out in the production device according to any one of claims 1-7. 9. The method according to claim 8, characterized in that the method comprises the steps of: Put in the urea solution with a mass concentration of 85-95% and a temperature of 75-100°C through the feeding pipe (7) and spray it on the medium granular urea on the receiving bucket (17) by the atomizing pump (9); Simultaneously start the shaking mechanism (2) to turn over the medium granular urea on the receiving bucket (17); After the feeding of the urea solution is completed, close the shaking mechanism (2), let it stand still, and discharge the material. 10. The method according to claim 9, characterized in that, while the shaking mechanism (2) is started, formaldehyde gas is introduced into the air distribution structure (23) arranged under the receiving bucket (17), and the upper part of the receiving bucket (17) The medium granular urea is stirred by gas disturbance; Preferably, 0.2% to 0.6% of thiourea and 0.1% to 0.3% of cyclodextrin are added to the urea solution.

Images