Phosphorus-based urea sulfate compound fertilizer production device

Abstract

The utility model relates to the technical field of compound fertilizer production equipment, concretely to a phosphorus base urea sulfuric acid compound fertilizer production device, including pelletizer, the urea sulfuric acid slurry preparation system and tubular reactor of pelletizer external connection, tubular reactor external connection first liquid ammonia storage tank and wet process phosphoric acid reactor, first liquid ammonia storage tank is used for supplying liquid ammonia, and wet process phosphoric acid reactor is used for supplying the sludge acid of wet process phosphoric acid reaction generation, and the urea sulfuric acid slurry preparation system is used for preparing urea sulfuric acid slurry. In the phosphorus base urea sulfuric acid compound fertilizer production device, the device is through the urea sulfuric acid slurry preparation system and tubular reactor of pelletizer external connection, combines newly added raw material feeding system and the return material system after the transformation, realizes one step method continuous preparation production phosphorus base urea sulfuric acid compound fertilizer, changes the production mode of traditional subunit preparation again physical compound, greatly shortens the production process, reduces the time loss of intermediate link, and remarkably improves production efficiency.

Description

Technical Field

[0001] This utility model relates to the technical field of compound fertilizer production equipment, specifically to a phosphorus-based urea-sulfuric acid compound fertilizer production device. Background Technology

[0002] In the field of fertilizer production technology, with the development of agricultural modernization, the requirements for the production efficiency and quality of compound fertilizers are increasing. As an important fertilizer product, the performance of the production equipment for urea sulfate compound fertilizer directly affects the environmental friendliness of the production process, product quality, and production efficiency.

[0003] Currently, traditional urea sulfate compound fertilizer production equipment employs several drawbacks in its granulation process. Common granulation techniques often result in voids leaking out of the raw materials during processing, leading to waste and the generation of significant dust. This dust pollutes the production environment, harms the health of operators, increases environmental costs, and can also disrupt equipment operation, reducing its lifespan. Furthermore, this traditional production method struggles to meet the growing market demand in terms of granulation precision and efficiency, resulting in inconsistent product quality and hindering further industry development.

[0004] A search revealed a patent application (application number 202410680160.9) disclosing a production apparatus for urea sulfate compound fertilizer. This apparatus, through an extrusion device including a support mechanism, a storage mechanism, a dividing mechanism, and a pressing mechanism, directly extrudes the raw material into a fixed container dividing mechanism for shaping, followed by further dividing. This addresses, to some extent, the problems of raw material leakage and dust generation during granulation. However, this apparatus still fails to effectively solve problems such as complex production processes, poor equipment coordination, and inability to fully utilize the heat of chemical reactions, making it difficult to achieve continuous one-step production. Significant room for improvement remains in energy consumption control, product particle strength, and roundness. Therefore, developing a production apparatus that overcomes the shortcomings of existing technologies and achieves efficient, environmentally friendly, and high-quality production of urea sulfate compound fertilizer has become an urgent problem for the industry. Utility Model Content

[0005] The purpose of this utility model is to provide a production device for phosphorus-based urea-sulfuric acid compound fertilizer, in order to solve the problems mentioned in the background art, such as the ineffective solution to the complex production process, poor equipment coordination, and inability to fully utilize the heat of chemical reaction, which makes it difficult to achieve one-step continuous production and there is still considerable room for improvement in energy consumption control, product particle strength and roundness.

[0006] To achieve the above objectives, this utility model provides a phosphate-based urea-sulfuric acid compound fertilizer production device, including a granulator. The granulator is externally connected to a urea-sulfuric acid slurry preparation system and a tubular reactor. The tubular reactor is externally connected to a first liquid ammonia storage tank and a wet-process phosphoric acid reactor. The first liquid ammonia storage tank is used to supply liquid ammonia, and the wet-process phosphoric acid reactor is used to supply sludge acid produced by the wet-process phosphoric acid reaction. The urea-sulfuric acid slurry preparation system is used to prepare urea-sulfuric acid slurry. The tubular reactor is used to receive liquid ammonia and sludge acid produced by the wet-process phosphoric acid reaction, thereby preparing ammonium phosphate slurry. The granulator is used to receive ammonium phosphate slurry and urea-sulfuric acid slurry and granulate them.

[0007] This system connects the granulator to an external urea-sulfuric acid slurry preparation system and a tubular reactor. The tubular reactor is further connected to a first liquid ammonia storage tank and a wet-process phosphoric acid reactor. The first liquid ammonia storage tank supplies liquid ammonia, and the wet-process phosphoric acid reactor supplies sludge acid. These react in the tubular reactor to prepare ammonium phosphate slurry; the urea-sulfuric acid slurry preparation system prepares the urea-sulfuric acid slurry. Finally, the granulator receives both slurries and granulates them, achieving an integrated continuous production process from raw material input to intermediate product preparation and final granulation. This integrates multiple previously independent production stages, ensuring smooth material flow at each stage.

[0008] Preferably, a secondary ammonia distributor for secondary ammonia injection is provided at the bottom of the granulator, and the secondary ammonia distributor is connected to a second liquid ammonia storage tank via a pipeline.

[0009] This feature includes a secondary ammonia distributor located at the bottom of the granulator, connected to a second liquid ammonia storage tank via pipeline. During the granulation reaction, liquid ammonia is introduced from the second liquid ammonia storage tank and evenly sprayed into the granulator through the ammonia distributor. The liquid ammonia further reacts with the material inside the granulator, a secondary ammonia reaction, which can adjust the pH of the material and promote certain reactions.

[0010] Preferably, both the first and second liquid ammonia storage tanks are equipped with ammonia self-coolers.

[0011] This ammonia self-cooler utilizes the principle of heat absorption during liquid ammonia vaporization and operates within the first and second liquid ammonia storage tanks. When the temperature of the liquid ammonia in the tanks rises, the ammonia self-cooler activates, and some of the liquid ammonia vaporizes, carrying away the heat and maintaining the liquid ammonia in the tanks at a suitable storage temperature.

[0012] Preferably, the granulator is internally equipped with a slurry spray pipe and a tube back spray pipe. The slurry spray pipe is equipped with several slurry nozzles, and the tube back spray pipe is equipped with several tube back spray nozzles. The slurry spray pipe is externally connected to a urea-sulfuric acid slurry preparation system, and the tube back spray pipe is externally connected to the output end of a tubular reactor.

[0013] This feature includes a slurry spray pipe and a tube-back spray pipe inside the granulator. The slurry spray pipe is connected to the urea-sulfuric acid slurry preparation system, and the tube-back spray pipe is connected to the output end of a tubular reactor. Each spray pipe is equipped with several nozzles. During granulator operation, the urea-sulfuric acid slurry and ammonium phosphate slurry are atomized and evenly sprayed onto the material bed inside the granulator through the corresponding spray pipes and nozzles.

[0014] Preferably, the granulator has a system return port at the top of one end, an exhaust gas outlet at the top of the other end, and a material discharge port at the bottom of the other end.

[0015] This feature includes a system return port at the top of one end of the granulator to return some of the material from the production process back into the granulator for a new round of granulation, which can adjust the composition and particle size distribution of the granulated material; an exhaust outlet at the top of the other end to discharge the waste gas generated during the granulation process; and a material discharge port at the bottom of the other end to discharge the material after granulation.

[0016] Preferably, a dryer is connected to the lower end of the material discharge port, one end of the dryer is connected to a hot air furnace system, a tail gas discharge port is provided at the upper part of the other end of the dryer, and a material outlet belt is provided at the lower part of the other end of the dryer.

[0017] This setup connects the lower end of the material discharge port to the dryer, allowing the granulated material to enter the dryer. One end of the dryer is connected to a hot air furnace system, which generates hot air that enters the dryer to dry the material. The upper exhaust port at the other end of the dryer discharges the waste gas generated during the drying process, while the lower material outlet conveyor belt is used to output the dried material.

[0018] Preferably, the urea-sulfuric acid slurry preparation system includes multiple reactors connected in series. The reactors are stirred and reacted after the addition of sulfuric acid, urea, process water and washing liquid. The bottom material after the reaction is output to the granulator through a slurry pump.

[0019] This urea-sulfuric acid slurry preparation system consists of multiple reactors connected in series. Sulfuric acid, urea, process water, and washing liquid are added to the reactors, and the reaction is carried out by stirring. The bottom layer of material after the reaction, due to factors such as density, is pumped to a granulator. The series reactors allow the reaction to proceed in steps, enabling better control of reaction conditions.

[0020] Preferably, mixed acid, synergistic agent, process water, and washing liquid are added to the wet-process phosphoric acid reactor for stirring and reaction. A pipe-backflow acid pump is installed on one side of the bottom of the wet-process phosphoric acid reactor, and a tail gas scrubbing discharge port is provided at the top of the wet-process phosphoric acid reactor.

[0021] This setup involves adding mixed acid, synergistic agents, process water, and washing liquid to a wet-process phosphoric acid reactor for stirring and reaction. A tubular backflow acid pump is installed on one side of the bottom to transport the sludge acid generated in the reactor to the tubular reactor; a tail gas scrubbing outlet is installed at the top to treat the tail gas generated during the reaction.

[0022] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0023] In this phosphorus-based urea-sulfuric acid compound fertilizer production unit, the unit connects the urea-sulfuric acid slurry preparation system and tubular reactor to the granulator, and combines the newly added raw material feeding system and the modified return material system to realize the one-step continuous production of phosphorus-based urea-sulfuric acid compound fertilizer. This changes the traditional production mode of unit preparation and physical compounding, greatly shortens the production process, reduces the time loss of intermediate links, and significantly improves production efficiency.

[0024] On the one hand, the acid disperser inside the tubular reactor mixing head was eliminated and the ammonia nozzle was modified to narrow the nozzle, enabling the liquid ammonia to react instantaneously with the wet-process phosphoric acid sludge, thus ensuring the stable generation of ammonium phosphate slurry. On the other hand, the urea-sulfuric acid slurry preparation system was designed with small-diameter nozzles with flared mouths to enhance atomization spraying. Combined with the optimized arrangement of spray lines inside the granulator, the ammonium phosphate slurry and urea-sulfuric acid slurry can be evenly coated on the granulation bed. After being fully aminated by the secondary ammonia distributor, the particle strength and sphericity are effectively enhanced while evaporating moisture, resulting in a more concentrated particle size distribution and improving the overall quality and market competitiveness of the product.

[0025] The tubular reactor is used to provide the granulation environment temperature and heat of reaction for the amino acid reaction. At the same time, the moisture in the wet material inside the granulator is further evaporated through the secondary ammoniation process, making full use of the heat of chemical reaction and reducing the external heating demand. In addition, the ammonia self-coolers installed in the first and second liquid ammonia storage tanks also help to reduce energy consumption and achieve energy-saving operation of the equipment.

[0026] The production process does not produce phosphogypsum, reducing the environmental risks and costs associated with phosphogypsum disposal. At the same time, the internal structural design and reaction process of the granulator reduce dust generation, and the design of the exhaust gas outlet and exhaust gas scrubbing outlet also helps to effectively treat the exhaust gas, reducing environmental pollution and meeting the requirements of green production. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0028] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0029] Figure 3 This is a schematic diagram of the connecting mechanism in this utility model;

[0030] Figure 4 This is a schematic diagram of the structure of the wet phosphoric acid reactor of this utility model;

[0031] The meanings of the labels in the diagram are as follows:

[0032] 1. Granulator; 11. System return port; 12. Tail gas outlet; 13. Material discharge port; 14. Slurry spray pipe; 141. Slurry nozzle; 15. Pipe back spray pipe; 151. Pipe back spray nozzle; 2. Tubular reactor; 3. Secondary ammoniation distributor; 4. Dryer; 41. Material outlet conveyor belt; 42. Tail gas discharge port; 5. Hot air furnace system; 6. Urea-sulfuric acid slurry preparation system; 7. First liquid ammonia storage tank; 8. Second liquid ammonia storage tank; 9. Wet-process phosphoric acid reactor; 91. Tail gas scrubbing discharge port; 92. Pipe back supply acid pump. Detailed Implementation

[0033] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0034] This utility model provides a production device for phosphorus-based urea-sulfuric acid compound fertilizer, such as... Figure 1 As shown, the system includes a granulator 1, an external urea-sulfuric acid slurry preparation system 6, and a tubular reactor 2. The tubular reactor 2 is externally connected to a first liquid ammonia storage tank 7 and a wet-process phosphoric acid reactor 9. The first liquid ammonia storage tank 7 is used to supply liquid ammonia, the wet-process phosphoric acid reactor 9 is used to supply sludge acid produced by the wet-process phosphoric acid reaction, the urea-sulfuric acid slurry preparation system 6 is used to prepare urea-sulfuric acid slurry, the tubular reactor 2 is used to receive liquid ammonia and sludge acid produced by the wet-process phosphoric acid reaction, and then prepare ammonium phosphate slurry. The granulator 1 is used to receive ammonium phosphate slurry and urea-sulfuric acid slurry and granulate them.

[0035] Granulator 1 is externally connected to urea-sulfuric acid slurry preparation system 6 and tubular reactor 2. Tubular reactor 2 is further externally connected to a first liquid ammonia storage tank 7 and a wet-process phosphoric acid reactor 9. The first liquid ammonia storage tank 7 supplies liquid ammonia, and the wet-process phosphoric acid reactor 9 supplies sludge acid. These two react in tubular reactor 2 to prepare ammonium phosphate slurry; urea-sulfuric acid slurry preparation system 6 prepares urea-sulfuric acid slurry. Finally, granulator 1 receives these two slurries and granulates them, realizing an integrated continuous production process from raw material input to intermediate product preparation and final granulation. This integrates multiple previously independent production stages, ensuring smooth material flow at each stage. It changes the complex traditional multi-unit preparation and physical mixing model, shortens the overall production process, reduces time losses in intermediate material transfer and storage, and significantly improves production efficiency. The close connection between each reaction stage facilitates precise control of the entire production process, ensuring sufficient reaction of each material and improving product quality stability.

[0036] In this embodiment, as Figure 1 As shown, a secondary ammonia distributor 3 for secondary ammonia injection is installed at the bottom of the granulator 1. The secondary ammonia distributor 3 is connected to the second liquid ammonia storage tank 8 through a pipeline.

[0037] A secondary ammonia distributor 3 is installed at the bottom inside the granulator 1 for injecting liquid ammonia during secondary ammonia reaction. The secondary ammonia distributor 3 is connected to a second liquid ammonia storage tank 8 via pipeline. When the granulation reaction is underway in the granulator 1, liquid ammonia can be introduced from the second liquid ammonia storage tank 8 and evenly sprayed into the granulator 1 through the secondary ammonia distributor 3. The liquid ammonia reacts further with the material in the granulator 1, i.e., the secondary ammonia reaction, which can adjust the pH of the material and promote certain reactions. The secondary ammonia reaction process allows the material to react more fully and further evaporates the moisture in the wet material in the granulator 1, which not only helps to enhance particle strength but also improves particle roundness and product quality; it also makes reasonable use of the heat of the ammonia reaction, reducing the need for external heating and lowering energy consumption.

[0038] Specifically, such as Figure 1 As shown, both the first liquid ammonia storage tank 7 and the second liquid ammonia storage tank 8 are equipped with ammonia self-coolers.

[0039] Both the first liquid ammonia storage tank 7 and the second liquid ammonia storage tank 8 are equipped with ammonia self-coolers. These self-coolers operate on the principle of heat absorption during liquid ammonia vaporization. When the temperature of the liquid ammonia in the tank rises, the self-cooler activates, and some of the liquid ammonia vaporizes, carrying away heat and maintaining the liquid ammonia in the first and second liquid ammonia storage tanks 7 and 8 at a suitable storage temperature. This reduces temperature fluctuations in the first and second liquid ammonia storage tanks 7 and 8, ensuring the stability of liquid ammonia storage, reducing liquid ammonia loss due to temperature changes, and reducing investment in external refrigeration equipment, thus lowering energy consumption and equipment maintenance costs.

[0040] Furthermore, such as Figure 2As shown, the granulator 1 is equipped with a slurry spray pipe 14 and a tube back spray pipe 15. Several slurry nozzles 141 are installed on the slurry spray pipe 14, and several tube back spray nozzles 151 are installed on the tube back spray pipe 15. The slurry spray pipe 14 is connected to the urea-sulfuric acid slurry preparation system 6, and the tube back spray pipe 15 is connected to the output end of the tube reactor 2.

[0041] A slurry spray pipe 14 and a tube-backspray pipe 15 are installed inside the granulator 1. Several slurry nozzles 141 are installed on the slurry spray pipe 14, and several tube-backspray nozzles 151 are installed on the tube-backspray pipe 15. The slurry spray pipe 14 is externally connected to the urea-sulfuric acid slurry preparation system 6, and the tube-backspray pipe 15 is externally connected to the output end of the tubular reactor 2. During operation of the granulator 1, the urea-sulfuric acid slurry and ammonium phosphate slurry are uniformly sprayed onto the material bed inside the granulator 1 in an atomized form through the slurry spray pipe 14 and slurry nozzles 141, and the tube-backspray pipe 15 and tube-backspray nozzles 151. Enhanced atomization spraying ensures that the two slurries are evenly coated on the granulation bed, ensuring uniform material mixing and providing a good foundation for subsequent granulation. This helps improve particle strength and sphericity, thus improving product quality. Optimized spray pipe arrangement and nozzle design improve slurry spraying efficiency, thereby increasing granulation efficiency.

[0042] Furthermore, such as Figure 2 As shown, a system return port 11 is provided at the top of one end of the granulator 1, an exhaust gas outlet 12 is provided at the top of the other end of the granulator 1, and a material discharge port 13 is provided at the bottom of the other end of the granulator 1.

[0043] The granulator 1 has a system return port 11 at the top of one end, used to return a portion of the material produced during the production process back into the granulator 1 to participate in a new round of granulation, which can adjust the composition and particle size distribution of the granulated material. The other end has a tail gas outlet 12 at the top, used to discharge waste gas generated during the granulation process. The other end has a material discharge port 13 at the bottom, used to discharge the material after granulation. The system return port 11 enables material recycling, and the return amount and composition can be flexibly adjusted according to different product requirements to meet diversified production needs. The tail gas outlet 12 facilitates centralized treatment of waste gas, reducing environmental pollution. The material discharge port 13 is designed for convenient material output, improving production continuity.

[0044] Furthermore, such as Figure 1 As shown, a dryer 4 is connected to the lower end of the material discharge port 13. A hot air furnace system 5 is connected to one end of the dryer 4. A tail gas discharge port 42 is provided at the upper part of the other end of the dryer 4. A material outlet belt 41 is provided at the lower part of the other end of the dryer 4.

[0045] The lower end of the material discharge port 13 is connected to the dryer 4, and the granulated material enters the dryer 4. One end of the dryer 4 is connected to a hot air furnace system 5, which generates hot air that enters the dryer 4 to dry the material. The other end of the dryer 4 has a tail gas discharge port 42 at the top to discharge the waste gas generated during the drying process, and a material outlet belt 41 at the bottom for discharging the dried material. This further removes moisture from the material, improves product dryness, and ensures product quality stability. The tail gas discharge port 42 centrally treats the drying waste gas, reducing environmental pollution. The material outlet belt 41 facilitates subsequent material transport and improves the degree of production automation.

[0046] Furthermore, such as Figure 3 As shown, the urea-sulfuric acid slurry preparation system 6 includes multiple reactors connected in series. The reactors are stirred and reacted after adding sulfuric acid, urea, process water and washing liquid. The bottom material after the reaction is output to the granulator 1 through the slurry pump.

[0047] The urea-sulfuric acid slurry preparation system 6 comprises multiple reactors connected in series. Sulfuric acid, urea, process water, and washing liquid are added to the reactors, and the reaction is carried out by stirring. The bottom layer material after the reaction is pumped to the granulator 1. The series reactors allow for stepwise reaction, enabling better control of reaction conditions. The multiple reactors connected in series ensure thorough reaction, improving the efficiency and quality of urea-sulfuric acid slurry preparation; stirring promotes uniform mixing of materials, ensuring reaction consistency; and the bottom layer material output design ensures stable slurry quality, providing high-quality raw materials for the subsequent granulator 1.

[0048] Furthermore, such as Figure 4 As shown, mixed acid, synergistic agent, process water and washing liquid are added to the wet process phosphoric acid reactor 9 and stirred for reaction. A pipe back-feed acid pump 92 is installed on one side of the bottom of the wet process phosphoric acid reactor 9, and a tail gas washing discharge port 91 is provided on the top of the wet process phosphoric acid reactor 9.

[0049] Mixed acid, synergistic agents, process water, and washing liquid are added to the wet-process phosphoric acid reactor 9 for stirring and reaction. A tubular reverse-flow acid supply pump 92 is installed on one side of the bottom of the wet-process phosphoric acid reactor 9 to transport the sludge acid generated in the reactor to the tubular reactor 2; a tail gas scrubbing outlet 91 is installed at the top to treat the tail gas generated during the reaction. Stirring ensures thorough mixing of materials, improving reaction efficiency; the synergistic agent optimizes the reaction effect; the tubular reverse-flow acid supply pump 92 ensures a stable acid supply to the tubular reactor 2, maintaining the continuity of the entire production process; the tail gas scrubbing outlet 91 treats the tail gas, reducing environmental pollution.

[0050] In operation, the phosphorus-based urea-sulfuric acid compound fertilizer production device of this invention first comprises multiple reactors connected in series in the urea-sulfuric acid slurry preparation system 6, forming the core reaction site. Sulfuric acid, urea, process water, and washing liquid are added to the reactors in proportion, and the mixture is thoroughly stirred by a stirring device to ensure uniform mixing and chemical reaction. During the reaction, by controlling the reaction conditions, the sulfuric acid and urea react fully to produce urea-sulfuric acid. Because of the series reactors, the reaction can proceed in steps, facilitating precise control of reaction conditions and ensuring complete reaction. After the reaction is completed, the bottom layer of material is pumped to the granulator 1 to provide raw materials for subsequent granulation.

[0051] The first liquid ammonia storage tank 7 supplies liquid ammonia. Mixed acid, synergistic agents, process water, and washing liquid are added to the wet-process phosphoric acid reactor 9 and stirred during the reaction. The resulting sludge acid is pumped to the tubular reactor 2 via a bottom-mounted reverse-feed acid pump 92. Inside the tubular reactor 2, the liquid ammonia and sludge acid react violently, instantly generating ammonium phosphate slurry. The acid disperser inside the mixing head of the tubular reactor has been eliminated, and the ammonia nozzle has been modified to be narrower, improving reaction efficiency and operational stability, making the reaction more complete and rapid.

[0052] Granulator 1, as the core granulation equipment, is connected to the urea-sulfuric acid slurry preparation system 6 via slurry spray pipe 14, and to the output end of pipe reactor 2 via pipe-reverse spray pipe 15. During granulator operation, urea-sulfuric acid slurry and ammonium phosphate slurry are atomized and uniformly sprayed onto the material bed inside granulator 1 through slurry nozzles 141 on slurry spray pipe 14 and pipe-reverse spray nozzles 151 on pipe-reverse spray pipe 15, respectively. The special design of the nozzles enhances the atomization spraying effect, enabling the slurry to be evenly coated on the granulation bed, ensuring thorough mixing of materials, and providing a good foundation for granulation.

[0053] The secondary ammonia distributor 3 located at the bottom of the granulator 1 is connected to the second liquid ammonia storage tank 8 via a pipeline. During the granulation reaction, liquid ammonia is introduced from the second liquid ammonia storage tank 8 and evenly sprayed into the granulator 1 through the secondary ammonia distributor 3. The liquid ammonia undergoes a secondary ammonia reaction with the acidic materials inside the granulator. This reaction not only adjusts the pH of the materials but also releases heat during the reaction, further evaporating the moisture from the wet materials inside the granulator. Simultaneously, the coated and rolling wet particles undergo a secondary ammonia coating process inside the granulator, completing the amino acid neutralization reaction on the surface of the material particles. This process enhances particle strength and improves particle roundness while evaporating the surface moisture of the wet materials.

[0054] The system return port 11 at the top of one end of the granulator 1 returns a portion of the material from the production process back into the granulator to participate in a new round of granulation. By adjusting the return amount and composition, the composition and particle size distribution of the granulated material can be controlled to meet the needs of different products. Waste gas generated during granulation is discharged from the exhaust outlet 12 at the top of the other end for centralized treatment, reducing environmental pollution. The granulated material is discharged from the material discharge port 13 at the bottom of the other end for subsequent processing.

[0055] Material discharged from material outlet 13 enters dryer 4. One end of dryer 4 is connected to a hot air furnace system 5. Hot air generated by the furnace enters dryer 4 to dry the material, further removing moisture and improving the dryness and quality stability of the product. Waste gas generated during the drying process is discharged from exhaust outlet 42 at the upper part of the other end of dryer 4 and treated. The dried material is output from material outlet belt 41 at the lower part of the other end of dryer 4, completing the entire compound fertilizer production process and ultimately yielding urea-sulfuric acid compound fertilizer containing phosphate groups.

[0056] Finally, it should be noted that the electronic components in the granulator 1 and other components in this embodiment are all general standard parts or parts known to those skilled in the art. Their structure and principle can be known to those skilled in the art through technical manuals or conventional experimental methods. In the idle part of this device, all the above-mentioned electrical components are connected by wires. The specific connection method should refer to the working order of each electrical component in the above working principle to complete the electrical connection. All of these are technologies known in the art.

[0057] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely preferred examples and are not intended to limit the utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A production apparatus for phosphorus-based urea-sulfuric acid compound fertilizer, comprising a granulator (1), characterized in that: The granulator (1) is externally connected to a urea-sulfuric acid slurry preparation system (6) and a tubular reactor (2). The tubular reactor (2) is externally connected to a first liquid ammonia storage tank (7) and a wet-process phosphoric acid reactor (9). The first liquid ammonia storage tank (7) is used to supply liquid ammonia. The wet-process phosphoric acid reactor (9) is used to supply sludge acid produced by the wet-process phosphoric acid reaction. The urea-sulfuric acid slurry preparation system (6) is used to prepare urea-sulfuric acid slurry. The tubular reactor (2) is used to receive liquid ammonia and sludge acid produced by the wet-process phosphoric acid reaction, and then prepare ammonium phosphate slurry. The granulator (1) is used to receive ammonium phosphate slurry and urea-sulfuric acid slurry and granulate them.

2. The phosphorourea-sulfuric acid compound fertilizer production apparatus according to claim 1, characterized in that: The granulator (1) is equipped with a secondary ammonia distributor (3) for secondary ammonia injection at the bottom of the interior. The secondary ammonia distributor (3) is connected to a second liquid ammonia storage tank (8) through a pipeline.

3. The phosphorourea-sulfuric acid compound fertilizer production apparatus according to claim 2, characterized in that: Both the first liquid ammonia storage tank (7) and the second liquid ammonia storage tank (8) are equipped with ammonia self-coolers.

4. The phosphorourea-sulfuric acid compound fertilizer production apparatus according to claim 1, characterized in that: The granulator (1) is equipped with a slurry spray pipe (14) and a tube back spray pipe (15). The slurry spray pipe (14) is equipped with several slurry nozzles (141), and the tube back spray pipe (15) is equipped with several tube back spray nozzles (151). The slurry spray pipe (14) is connected to the urea-sulfuric acid slurry preparation system (6), and the tube back spray pipe (15) is connected to the output end of the tubular reactor (2).

5. The phosphorourea-sulfuric acid compound fertilizer production apparatus according to claim 1, characterized in that: The granulator (1) has a system return port (11) at the top of one end, a tail gas outlet (12) at the top of the other end, and a material discharge port (13) at the bottom of the other end.

6. The phosphorourea-sulfuric acid compound fertilizer production apparatus according to claim 5, characterized in that: The lower end of the material discharge port (13) is connected to a dryer (4), one end of the dryer (4) is connected to a hot air furnace system (5), the upper part of the other end of the dryer (4) is provided with a tail gas discharge port (42), and the lower part of the other end of the dryer (4) is provided with a material outlet belt (41).

7. The apparatus for producing phosphorus-based urea-sulfuric acid compound fertilizer according to claim 1, characterized in that: The urea-sulfuric acid slurry preparation system (6) includes multiple reactors connected in series. The reactors are stirred and reacted after adding sulfuric acid, urea, process water and washing liquid. The bottom material after the reaction is output to the granulator (1) through the slurry pump.

8. The apparatus for producing phosphorus-based urea-sulfuric acid compound fertilizer according to claim 1, characterized in that: Mixed acid, synergist, process water and washing liquid are added to the wet phosphoric acid reactor (9) and stirred for reaction. A pipe-backflow acid pump (92) is installed on one side of the bottom of the wet phosphoric acid reactor (9), and a tail gas washing discharge port (91) is provided on the top of the wet phosphoric acid reactor (9).

Images