A spray granulation device for compound fertilizer

Abstract

This utility model discloses a spray granulation device for compound fertilizer, belonging to the field of compound fertilizer technology. It includes a melting tank, a spray mixing tank, a homogenizer, a granulation tower, a high-level spray tank, a tail gas treatment structure, a steam separator, a nozzle cleaning tank, a gas-liquid separator, a condensate storage tank, and a cleaning liquid storage tank. The condensate outlets of the melting tank, spray mixing tank, homogenizer, and steam separator are connected to the inlet of the gas-liquid separator via pipelines. The gas phase outlet of the gas-liquid separator is connected to the steam inlet of the batching tank of the ammonium granulation device via a pipeline, and its liquid phase outlet is connected to the condensate storage tank via a pipeline. The condensate storage tank is connected to a boiler via a pipeline. The nozzle cleaning tank, cleaning liquid storage tank, and ammonium phosphate dissolution tank of the ammonium granulation device are sequentially connected via pipelines. The washing liquid outlet of the tail gas treatment structure is connected to the ammonium high-level tank of the ammonium granulation device via a pipeline. Waste steam, washing liquid, and cleaning liquid from the spray granulation device can be sent to the ammonium granulation device for reuse.

Description

Technical Field

[0001] This utility model belongs to the field of compound fertilizer technology, and specifically relates to a spray granulation device for compound fertilizer, which can send the waste steam, washing liquid and cleaning liquid of the spray granulation device to the ammoniation granulation device for reuse. Background Technology

[0002] Compound fertilizers are chemical fertilizers containing two or more of the essential nutrients nitrogen, phosphorus, and potassium. They have advantages such as high nutrient content, fewer byproducts, and good physical properties, playing a vital role in balanced fertilization, improving fertilizer utilization, and promoting high and stable crop yields. Common compound fertilizers include sulfur-based compound fertilizers and nitro-based compound fertilizers.

[0003] The production process of nitro compound fertilizer can be as follows: molten urea is mixed with raw materials such as phosphorus and potassium, and then sprayed down from the top of a high tower and naturally cooled to form granules.

[0004] For example, patent application number CN201721015125.7 discloses a nitro compound fertilizer production system, including: a first conveying line and a second conveying line, each including a batching device, a screening machine, a screw conveyor, a high-tower elevator, and a mixing silo connected in sequence; a primary mixing tank connected to the mixing silo of the first conveying line; and a secondary mixing tank connected to the mixing silo of the second conveying line. The secondary mixing tank is connected to the finished product silo in sequence through a homogenizer I, a granulator, a granulation tower, a disc scraper, a cooling screening device, and an oil film coating device. The primary mixing tank is connected to the secondary mixing tank in sequence through a homogenizer II and a flash evaporator. In the second conveying line, the batching device includes a feeding silo I for adding base fertilizer and a feeding silo II for adding additives. The feeding silo I and the feeding silo II are connected in sequence. Each of the two silos (II and III) is fed to a consolidation belt via a batching belt, which then feeds the material to a screening machine. The screening machine also returns material to the consolidation belt via a crusher. The returned material from the cooling screening device is returned to a melting tank via a high-tower elevator (III). An ammonium nitrate neutralization device is connected to the melting tank via a first ammonium nitrate flash evaporation device. A dehumidification device is connected to a second cooling drum. A controller and an operating station connected to the controller are also included. The melting tank, the primary mixing tank, and the secondary mixing tank are all equipped with stirring motors and heating devices. The high-tower elevator, the disc scraper, the dehumidification device, the stirring motor, the heating device, the crusher, and the batching belt are all equipped with electrical instruments, which are all connected to the controller.

[0005] The production process of sulfur-based compound fertilizer is as follows: using the amino acid method, ammonium phosphate is dissolved in liquid and then sent to a reactor to react with ammonia and sulfuric acid; urea is melted and mixed with other raw materials, then mixed with the raw materials output from the reactor, and finally sent to a rotary drum granulator to react with ammonia. After granulation, it is dried and cooled to obtain the product.

[0006] For example, patent application number CN202510232827.3 discloses an amino acid-based compound fertilizer production system, including a raw material preparation unit, a reaction unit, a granulation unit, and a drying unit connected by pipelines. The granulation unit includes a dissolving tank, a primary mixing tank, a secondary mixing tank, and a rotary drum granulator connected by pipelines. The reaction unit includes a phosphate ammonium dissolving tank and a tubular reactor. The tubular reactor has multiple inlets, and the outlet of the phosphate ammonium dissolving tank is connected to one inlet of the tubular reactor. The raw material preparation unit is connected to the phosphate ammonium dissolving tank, the dissolving tank, the primary mixing tank, and the other inlets of the tubular reactor. The outlet of the tubular reactor is connected to the secondary mixing tank, and the outlet of the rotary drum granulator is connected to the drying unit. The raw material preparation unit includes a urea silo, a potassium salt silo, an ammonium salt silo, a filler silo, a monoammonium phosphate silo, a sulfuric acid tank, and a gaseous ammonia tank. The monoammonium phosphate silo is connected to the phosphate ammonium dissolving tank. The sulfuric acid tank and the gaseous ammonia tank are connected to the inlets of the tubular reactor. The urea silo is connected to the dissolving tank, and the potassium salt silo, ammonium salt silo, and filler silo are all connected to the primary mixing tank.

[0007] The applicant discovered during the actual production of nitro compound fertilizer that the large amount of molten urea required generates a significant amount of condensate. Direct discharge of this condensate not only wastes clean water resources but also thermal energy. Furthermore, the raw material mixing process generates dust and steam, the treatment of which produces nutrient-containing washing liquid. Additionally, during the production of nitro compound fertilizer (where urea solidifies at low temperatures, easily clogging nozzles), frequent cleaning (usually using steam when necessary, such as periodic cleaning, changing varieties, or in case of abnormalities) of the nozzles in the granulation tower generates nutrient-containing cleaning liquid. However, the granulation process for nitro compound fertilizer primarily consumes clean water (as makeup water for exhaust gas treatment and cleaning water for various structures; the cleaning liquid can be used as liquid fertilizer or collected and sent to the granulation tower for spray preparation of low-nutrient compound fertilizer) and cannot utilize the nutrient-containing washing water and cleaning liquid. Summary of the Invention

[0008] To address the aforementioned problems, this utility model provides a spray granulation device for compound fertilizers, which can send the waste steam, washing liquid, and cleaning liquid from the spray granulation device to an ammoniation granulation device for reuse. The technical solution is as follows:

[0009] This utility model provides a spray granulation device for compound fertilizer. The device includes a melting tank 1, a spray mixing tank 3, a homogenizer 4, a granulation tower 6, a high-level spray tank 7, a tail gas treatment structure, a steam distributor 11, and a nozzle cleaning tank 12. The melting tank 1, spray mixing tank 3, homogenizer 4, and granulation tower 6 are connected sequentially via pipelines. The high-level spray tank 7 is connected to the melting tank 1, spray mixing tank 3, and tail gas treatment structure via pipelines. The tail gas outlets of the melting tank 1 and spray mixing tank 3 are both connected to the tail gas treatment structure via pipelines. The inlet of the steam distributor 11 is connected to a boiler via a pipeline, and its outlet is connected to the steam inlets of the melting tank 1, spray mixing tank 3, and homogenizer 4, and the nozzle cleaning steam inlet of the granulation tower 6 via pipelines. The granulation process... The cleaning liquid outlet of tower 6 is connected to the nozzle cleaning tank 12 via a pipeline; the device also includes a gas-liquid separator 13, a condensate storage tank, and a cleaning liquid storage tank 14. The condensate outlets of the melting tank 1, the spray mixing tank 3, the homogenizer 4, and the steam separator 11 are all connected to the inlet of the gas-liquid separator 13 via pipelines with drain valves; the gas phase outlet of the gas-liquid separator 13 is connected to the steam inlet of the batching tank of the ammonium granulation device via a pipeline, and its liquid phase outlet is connected to the condensate storage tank via a pipeline; the condensate storage tank is connected to the boiler via a pipeline; the nozzle cleaning tank 12, the cleaning liquid storage tank 14, and the ammonium phosphate dissolution tank of the ammonium granulation device are connected sequentially via pipelines, and the washing liquid outlet of the tail gas treatment structure is connected to the ammonium high-level tank of the ammonium granulation device via a pipeline.

[0010] The exhaust gas treatment structure in this embodiment includes a spray tower 8, a circulation tank 9, and a circulation pump 10. The spray tower 8, circulation tank 9, and circulation pump 10 are connected end to end. The exhaust gas outlets of the melting tank 1 and the spray mixing tank 3 are both connected to the spray tower 8 through pipelines with fans 15. The water inlet of the circulation tank 9 is connected to the high-level spray tank 7 through a pipeline, and its drain outlet is connected to the high-level ammoniation tank through a pipeline.

[0011] Specifically, in this embodiment of the present invention, the high-level spraying tank 7 is higher than the melting tank 1, the spraying mixing tank 3 is lower than the melting tank 1 and is connected to the melting tank 1 through the first insulation pipe 2, the spraying mixing tank 3 and the homogenizer 4 are arranged side by side and directly connected, and the granulation tower 6 and the homogenizer 4 are connected through the second insulation pipe 5; the steam inlets of the first insulation pipe 2 and the second insulation pipe 5 are both connected to the steam separator 11 through pipelines, and their condensate outlets are both connected to the inlet of the gas-liquid separator 13 through pipelines with drain valves.

[0012] Preferably, in this embodiment of the present invention, the condensate outlets of the melting tank 1, the spray mixing tank 3, the homogenizer 4, the steam distributor 11, the first insulation pipe 2, and the second insulation pipe 5 are all connected to the condensate main pipe through condensate branch pipes with drain valves; the condensate main pipe has two outputs and is switched by a valve group, one output to the inlet of the gas-liquid separator 13, and the other output to the condensate storage tank.

[0013] Specifically, in this embodiment of the present invention, there are two spray mixing tanks 3 connected in series; the melting tank 1, the spray mixing tank 3 and the homogenizer 4 are all equipped with a stirrer.

[0014] The ammoniation granulation device in this embodiment includes an ammoniation high-level tank, a batching tank, an ammoniation mixing tank, a phosphate dissolving tank, a tubular reactor, and a rotary drum granulator. The phosphate dissolving tank, the tubular reactor, the ammoniation mixing tank, and the rotary drum granulator are connected sequentially by pipelines. The batching tank is connected to the ammoniation mixing tank by a pipeline, and the ammoniation high-level tank is connected to the phosphate dissolving tank by a pipeline.

[0015] In this embodiment of the invention, the steam separator 11 is equipped with a pressure gauge and a thermometer, and the steam pressure inside is 0.6-1.4 MPa. It is also equipped with a first safety valve, the set pressure of which is 1.5 MPa. The gas-liquid separator 13 is equipped with a second safety valve, the set pressure of which is 0.25 MPa.

[0016] Specifically, in this embodiment of the present invention, the nozzle cleaning tank 12 has a size of 800mm*500mm*500mm, the cleaning fluid storage tank 14 has a size of 6000mm*3000mm*1500mm, and the condensate storage tank has a size of 3000mm*2000mm*1000mm.

[0017] The beneficial effects of the technical solution provided by this utility model embodiment are as follows: This utility model embodiment provides a spray granulation device for compound fertilizer. The gas phase outlet (low-pressure steam) of the gas-liquid separator of this patent is connected to the steam inlet of the batching tank of the ammoniation granulation device through a pipeline, and its liquid phase outlet (condensate) is connected to the condensate storage tank through a pipeline. The condensate storage tank is connected to the boiler through a pipeline. The nozzle cleaning tank, the cleaning liquid storage tank (cleaning liquid with high nutrient content), and the ammonium phosphate dissolution tank of the ammoniation granulation device are connected in sequence through pipelines, and the washing liquid outlet (washing liquid with low nutrient content) of the tail gas treatment structure is connected to the ammoniation high-level tank of the ammoniation granulation device through a pipeline. Thus, the waste steam, washing liquid, and cleaning liquid of the spray granulation device can be sent to the ammoniation granulation device for reuse. Attached Figure Description

[0018] Figure 1This is a partial structural schematic diagram of the spray granulation device for compound fertilizer provided in this embodiment of the utility model;

[0019] Figure 2 This is a schematic block diagram of the spray granulation device for compound fertilizer according to an embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of the ammoniation granulation device.

[0021] In the diagram: 1. Melting tank, 2. First insulation pipe, 3. Spray mixing tank, 4. Homogenizer, 5. Second insulation pipe, 6. Granulation tower, 7. High-level spray tank, 8. Spray tower, 9. Circulation tank, 10. Circulation pump, 11. Steam separator, 12. Nozzle cleaning tank, 13. Gas-liquid separator, 14. Cleaning liquid storage tank, 15. Fan.

[0022] A. Clean water; B. To the batching tank; C. To the condensate storage tank; D. To the ammonium phosphate dissolving tank; E. Steam; F. To the ammoniation high-level tank. Detailed Implementation

[0023] To make the objectives, technical solutions and advantages of this utility model clearer, the utility model will be described in further detail below with reference to the accompanying drawings.

[0024] Example 1

[0025] See Figure 1-3 Example 1 provides a spray granulation device for compound fertilizer. The device includes a melting tank 1, a spray mixing tank 3, a homogenizer 4, a granulation tower 6, a high-level spray tank 7, a tail gas treatment structure, a steam separator 11, a nozzle cleaning tank 12, a gas-liquid separator 13, a condensate storage tank, a cleaning liquid storage tank 14, and multiple feeding structures.

[0026] The molten tank 1, spray mixing tank 3, homogenizer 4, and granulation tower 6 are connected sequentially via pipelines. Specifically, the high-level spray tank 7 is higher than the molten tank 1 and is filled with clean water. It is connected to the molten tank 1 (used for cleaning the molten tank 1, which is heated during cleaning), the spray mixing tank 3 (used for cleaning the mixing tank 3, which is heated during cleaning), and the exhaust gas treatment structure (used for water replenishment) via pipelines. The spray mixing tank 3 is lower than the molten tank 1 and is connected to the molten tank 1 via a first insulation pipe 2 (set at an incline). The spray mixing tank 3 is set side by side with the homogenizer 4 and directly connected. The granulation tower 6 is connected to the homogenizer 4 via a second insulation pipe 5. Multiple feeding structures are connected to the molten tank 1 (for adding urea) and the spray mixing tank 3 (for adding other raw materials, such as potassium salts and ammonium phosphate) as needed.

[0027] The exhaust gas outlets of both the melting tank 1 and the spray mixing tank 3 are connected to the exhaust gas treatment structure via pipelines with fans 15. The inlet of the steam distributor 11 is connected to the boiler via a pipeline, and its outlet is connected via pipelines to the steam inlet of the melting tank 1 (for heating the melting tank 1), the steam inlet of the spray mixing tank 3 (for heat preservation of the spray mixing tank 3), the steam inlet of the homogenizer 4 (for heat preservation of the spray homogenizer 4), the steam inlet of the first insulation pipe 2 (for heat preservation), the steam inlet of the second insulation pipe 5 (for heat preservation), and the nozzle cleaning steam inlet of the granulation tower 6 (for nozzle cleaning). The cleaning liquid outlet of the granulation tower 6 is connected to the nozzle cleaning tank 12 via a pipeline; the nozzle cleaning tank 12 is smaller, located near the granulation tower 6, and is lower than the granulation tower 6.

[0028] The condensate outlets of the melting tank 1, the spray mixing tank 3, the homogenizer 4, the steam distributor 11, the first insulation pipe 2, and the second insulation pipe 5 are all connected to the inlet of the gas-liquid separator 13 via pipelines equipped with steam traps. The gas phase outlet of the gas-liquid separator 13 is connected via a pipeline to the steam inlet of the batching tank of the ammoniation granulation unit (since urea is typically used in small quantities, the steam consumption is also small, so collected low-pressure steam can be used) to serve as the steam for urea melting. Its liquid phase outlet is connected via a pipeline to the condensate storage tank. The condensate storage tank is connected to the boiler via a pipeline.

[0029] The cleaning solution storage tank 14 is relatively large and is located far from the granulation tower 6. The nozzle cleaning tank 12 (which contains a high nutrient content of the cleaning solution), the cleaning solution storage tank 14 (which can also be directly output as liquid fertilizer), and the ammonium phosphate dissolution tank of the ammonium granulation device are connected in sequence by pipelines. The washing solution outlet of the tail gas treatment structure (which outputs washing solution with a low nutrient content) is connected to the ammonium high-level tank of the ammonium granulation device by pipelines.

[0030] Among them, see Figure 1-2 The exhaust gas treatment structure in this embodiment includes a spray tower 8, a circulation tank 9, and a circulation pump 10 (two pumps, one in use and one on standby). The spray tower 8, circulation tank 9, and circulation pump 10 are connected end to end, consistent with the prior art. The exhaust gas outlets of the melting tank 1 and the spray mixing tank 3 are both connected to the spray tower 8 via pipelines with fans 15. The water inlet of the circulation tank 9 is connected to the high-level spray tank 7 via a pipeline for water replenishment, and its outlet (output after reaching a certain concentration or density) is connected to the high-level ammoniation tank via a pipeline.

[0031] Among them, see Figure 3The ammoniation granulation device in this embodiment includes an ammoniation high-level tank, a batching tank, an ammoniation mixing tank, a phosphate dissolving tank, a tubular reactor, a rotary drum granulator, and multiple feeding structures. The batching tank can consist of multiple tanks, such as the one described in patent application number CN202510232827.3, which includes a dissolving tank (connected to the urea feeding structure (for adding urea), whose vapor inlet is connected to the gas phase outlet of the gas-liquid separator 13 via a pipeline) and a primary mixing tank (connected to other raw material feeding structures (for adding other raw materials besides urea and phosphate, such as potassium salts, ammonium sulfate, fillers, etc.)). The phosphate dissolving tank (connected to the phosphate feeding structure, used to prepare phosphate solution), the tubular reactor, the ammoniation mixing tank, and the rotary drum granulator are sequentially connected via pipelines. Ammonia and sulfuric acid are also introduced into the tubular reactor, and ammonia is also introduced into the rotary drum granulator. The batching tank is connected to the ammoniation mixing tank via pipelines. The ammoniation high-level tank is located at a high level and is connected to the ammonium phosphate dissolution tank via pipelines (it can also be connected to the batching tank, ammoniation mixing tank, and tubular reactor).

[0032] In this embodiment of the invention, the steam separator 11 is equipped with a pressure gauge and a thermometer, and the steam pressure inside is 0.6-1.4 MPa. It also has a first safety valve that can simultaneously accept steam at pressures of 0.8 MPa and 1.3 MPa. The set pressure of the first safety valve is 1.5 MPa. The gas-liquid separator 13 is equipped with a second safety valve, and the set pressure of the second safety valve is 0.25 MPa.

[0033] Example 2

[0034] See Figure 1 Example 2 provides a spray granulation device for compound fertilizer, whose structure is basically the same as that of Example 1, except that: in this example, the condensate outlets of the melting tank 1, spray mixing tank 3, homogenizer 4, steam distributor 11, first insulation pipe 2, and second insulation pipe 5 are all connected to the condensate main pipe through condensate branch pipes with drain valves. The condensate main pipe has two outputs, which are switched by a valve group (when the batching tank of the ammoniation granulation device does not require steam, it is switched to the condensate storage tank). One output goes to the inlet of the gas-liquid separator 13, and the other output goes to the condensate storage tank. This patent makes the device more flexible.

[0035] Example 3

[0036] Example 3 provides a spray granulation device for compound fertilizer, whose structure is basically the same as that of Example 1, except that: in this example, there are two spray mixing tanks 3; the two spray mixing tanks 3 are connected in series, namely a primary mixing tank (specifically two tanks arranged side by side, for adding ammonium nitrate and return materials, etc.) and a secondary mixing tank (for adding potassium salts, etc.). The melting tank 1, the spray mixing tank 3 and the homogenizer 4 are all equipped with a stirrer, and all of them are equipped with a heating structure.

[0037] Example 4

[0038] Example 4 provides a spray granulation device for compound fertilizer, whose structure is basically the same as that of Example 1, except that the spray granulation device for compound fertilizer in this example is used in a 150,000-ton compound fertilizer production system. The nozzle cleaning tank 12 has dimensions of 800mm*500mm*500mm, the cleaning liquid storage tank 14 has dimensions of 6000mm*3000mm*1500mm, and the condensate storage tank has dimensions of 3000mm*2000mm*1000mm.

[0039] In this embodiment, "first" and "second" serve only as distinctions and have no other special meaning. Valves, flow meters, and / or pumps may be installed on the pipelines between the various structures as needed.

[0040] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A spray granulation device for compound fertilizer, comprising a melting tank (1), a spray mixing tank (3), a homogenizer (4), a granulation tower (6), a high-level spray tank (7), a tail gas treatment structure, a steam separator (11), and a nozzle cleaning tank (12), wherein the melting tank (1), the spray mixing tank (3), the homogenizer (4), and the granulation tower (6) are connected sequentially by pipelines, and the high-level spray tank (7) is connected to the melting tank (1), the spray mixing tank (3), and the tail gas treatment structure by pipelines. The structure is connected in such a way that the exhaust gas outlets of the melting tank (1) and the spray mixing tank (3) are both connected to the exhaust gas treatment structure via pipelines; the inlet of the steam separator (11) is connected to the boiler via a pipeline, and its outlet is connected to the steam inlet of the melting tank (1), the spray mixing tank (3), and the homogenizer (4) and the nozzle cleaning steam inlet of the granulation tower (6) via a pipeline; the cleaning liquid outlet of the granulation tower (6) is connected to the nozzle cleaning tank (12) via a pipeline; the structure is characterized in that, The device also includes a gas-liquid separator (13), a condensate storage tank, and a cleaning liquid storage tank (14). The condensate outlets of the melting tank (1), the spray mixing tank (3), the homogenizer (4), and the steam separator (11) are all connected to the inlet of the gas-liquid separator (13) through pipelines with drain valves. The gas phase outlet of the gas-liquid separator (13) is connected to the steam inlet of the batching tank of the ammonium granulation device through a pipeline, and its liquid phase outlet is connected to the condensate storage tank through a pipeline. The condensate storage tank is connected to the boiler through a pipeline. The nozzle cleaning tank (12), the cleaning liquid storage tank (14), and the ammonium phosphate dissolution tank of the ammonium granulation device are connected in sequence through pipelines. The washing liquid outlet of the tail gas treatment structure is connected to the ammonium high-level tank of the ammonium granulation device through a pipeline.

2. The prilling device for compound fertilizer according to claim 1, characterized in that, The exhaust gas treatment structure includes a spray tower (8), a circulation tank (9), and a circulation pump (10). The spray tower (8), circulation tank (9), and circulation pump (10) are connected end to end. The exhaust gas outlets of the melting tank (1) and the spray mixing tank (3) are connected to the spray tower (8) through pipelines with fans (15). The water inlet of the circulation tank (9) is connected to the high-level spray tank (7) through a pipeline, and its drain outlet is connected to the high-level ammoniation tank through a pipeline.

3. The prilling device for compound fertilizer according to claim 1, characterized in that, The high-level spray tank (7) is higher than the melting tank (1), the spray mixing tank (3) is lower than the melting tank (1) and is connected to the melting tank (1) through the first insulation pipe (2), the spray mixing tank (3) and the homogenizer (4) are arranged side by side and directly connected, the granulation tower (6) and the homogenizer (4) are connected through the second insulation pipe (5); the steam inlets of the first insulation pipe (2) and the second insulation pipe (5) are connected to the steam separator (11) through pipelines, and their condensate outlets are connected to the inlet of the gas-liquid separator (13) through pipelines with drain valves.

4. The prilling device for compound fertilizer according to claim 3, characterized in that, The condensate outlets of the melting tank (1), the spray mixing tank (3), the homogenizer (4), the steam distributor (11), the first insulation pipe (2), and the second insulation pipe (5) are all connected to the condensate main pipe through condensate branch pipes with drain valves; the condensate main pipe outputs in two directions and is switched by a valve group, one output to the inlet of the gas-liquid separator (13), and the other output to the condensate storage tank.

5. The spray granulation device for compound fertilizer according to claim 1, characterized in that, There are two spray mixing tanks (3), and the two spray mixing tanks (3) are connected in series; the melting tank (1), the spray mixing tank (3) and the homogenizer (4) are all equipped with a stirrer.

6. The spray granulation device for compound fertilizer according to claim 1, characterized in that, The ammoniation granulation device includes an ammoniation high-level tank, a batching tank, an ammoniation mixing tank, a phosphate dissolving tank, a tubular reactor, and a rotary drum granulator. The phosphate dissolving tank, the tubular reactor, the ammoniation mixing tank, and the rotary drum granulator are connected in sequence through pipelines. The batching tank is connected to the ammoniation mixing tank through a pipeline, and the ammoniation high-level tank is connected to the phosphate dissolving tank through a pipeline.

7. The spray granulation device for compound fertilizer according to claim 1, characterized in that, The steam separator (11) is equipped with a pressure gauge and a thermometer, and the steam pressure inside is 0.6-1.4 MPa. It is equipped with a first safety valve, the set pressure of which is 1.5 MPa. The gas-liquid separator (13) is equipped with a second safety valve, the set pressure of which is 0.25 MPa.

8. The spray granulation device for compound fertilizer according to claim 1, characterized in that, The nozzle cleaning tank (12) has a size of 800mm*500mm*500mm, the cleaning fluid storage tank (14) has a size of 6000mm*3000mm*1500mm, and the condensate storage tank has a size of 3000mm*2000mm*1000mm.

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