A tubular reaction device in compound fertilizer production

Abstract

The present invention discloses a tubular reaction device in compound fertilizer production, which belongs to the technical field of compound fertilizer production, and includes: an inner tube, an outer tube, a dynamic mixing structure, a liquid ammonia inlet tube, a steam inlet tube, a sulfuric acid inlet tube and a nozzle. A partition is provided in the inner tube to separate the interior of the inner tube and form a first mixing chamber and a second mixing chamber from its feed end to its discharge end respectively; the outer tube includes a first pipeline and a second pipeline connected to each other, and a flow-equalizing chamber connected to the first mixing chamber is formed between the first pipeline and the inner tube; the dynamic mixing structure includes a driving part and a mixing part; the liquid ammonia inlet tube and the steam inlet tube are both connected to the feed end of the inner tube, the sulfuric acid inlet tube is connected to the flow-equalizing chamber, and the nozzle is connected to the second mixing chamber to be extended into the granulation cylinder and sprayed to the material layer; the present invention realizes sufficient mixing of the raw materials by dynamically introducing, mixing and diverting the raw materials, thereby realizing continuous fertilizer production and improving granulation performance.

Description

Technical Field

[0001] The invention relates to the technical field of compound fertilizer production, in particular to a tubular reaction device in compound fertilizer production. Background Art

[0002] At present, the production process of compound fertilizers using the ammonia method is gradually emerging, representing the latest process for compound fertilizer production. The rotary drum reactor used in the production of ammonia compound fertilizers is a rotary drum reactor in which sulfuric acid pipelines and liquid ammonia pipelines are set. Among them, the liquid ammonia pipeline is set at the bottom of the drum, buried by the reaction materials during operation, and part of the sprayed liquid ammonia is adsorbed by the solid powdered materials; the sulfuric acid pipeline is set at the upper part of the rotary drum reactor, and sulfuric acid is sprayed onto the reaction materials through holes in the pipeline, and then the rotary drum reactor is mixed with liquid ammonia during the rotation process for neutralization reaction.

[0003] Publication No. CN102875218A provides a tubular reactor for preparing ammonia-based compound fertilizer, comprising a three-way pipe, a plurality of reaction tubes, an elbow and a nozzle connected in sequence horizontally, steam is added through a steam inlet for preheating, gaseous ammonia from an ammonia station enters the tubular reactor through an ammonia inlet pipe after being metered, sulfuric acid is transported by a sulfuric acid pump and added to the tubular reactor after being metered, sulfuric acid and ammonia react completely in the tubular reactor, the nozzle enables the ammonium sulfate solution to be well atomized and evenly sprayed on the material layer in the granulator, and completes the granulation process with other materials;

[0004] However, in the production process of compound fertilizer, the various liquid raw materials used need to be fully mixed and evenly mixed. How to achieve the complete neutralization reaction in a limited tubular reactor and achieve the required product indicators as much as possible within a unit time has become one of the technical problems that the fertilizer production industry urgently needs to solve. Summary of the invention

[0005] The purpose of the present invention is to overcome the above technical deficiencies, provide a tubular reaction device for compound fertilizer production, and solve the technical problems in the prior art.

[0006] In order to achieve the above technical purpose, the technical solution of the present invention provides a tubular reaction device for compound fertilizer production, comprising:

[0007] An inner tube, wherein the inner tube is provided with a partition plate for dividing the interior of the inner tube and forming a first mixing chamber and a second mixing chamber from its feed end to its discharge end respectively;

[0008] The outer tube includes a first tube and a second tube connected to each other, a flow-equalizing chamber connected to the first mixing chamber is formed between the first tube and the inner tube, flow-equalizing holes and flow-dividing holes are respectively opened around the inner tube at positions corresponding to the first tube and the second tube, a flow-dividing chamber surrounding the outer side of the partition is formed between the second tube and the inner tube, and the flow-dividing chamber is respectively connected to the first mixing chamber and the second mixing chamber through the flow-dividing holes;

[0009] A dynamic mixing structure, the dynamic mixing structure includes a driving member and a mixing member, the mixing member penetrates the partition and its two ends are respectively arranged in the first mixing chamber and the second mixing chamber, the driving member is connected to the mixing member to drive the mixing member to rotate so as to stir the fluid in the first mixing chamber and the second mixing chamber;

[0010] The liquid ammonia inlet pipe, the steam inlet pipe, the sulfuric acid inlet pipe and the nozzle are all connected with the feed end of the inner tube, the sulfuric acid inlet pipe is connected with the flow-averaging chamber, and the nozzle is connected with the second mixing chamber so as to be extended into the granulation cylinder and sprayed onto the material layer.

[0011] In some embodiments, the driving member includes a first motor, the mixing member includes a first screw rod, the first screw rod is coaxially rotatable inside the inner tube, the first motor is arranged on one side of the inner tube and the driving shaft of the first motor passes through the inner tube and is connected to the first screw rod.

[0012] In some embodiments, the spiral direction of the first spiral rod is opposite to the flow direction of the fluid in the inner tube, and the inner tube is arranged vertically when in use.

[0013] In some embodiments, the first spiral rod is connected to the partition plate through a bearing, and a sealing ring is provided on the bearing.

[0014] In some embodiments, the outer tube also includes a third tube connected to one end of the second tube, and the discharge end portion of the inner tube forms a discharge pipe at a position corresponding to the third tube. The tubular reaction device in the production of compound fertilizer also includes a static mixing structure, which includes a plurality of first baffles obliquely arranged in the discharge pipe and used to separate the discharge pipe to form a plurality of first guide chambers, and a plurality of second baffles arranged between the discharge pipe and the third pipe and used to separate the discharge pipe and the third pipe to form a plurality of second guide chambers, and the first baffles and the second baffles are arranged at intervals in sequence, and two guide holes are provided on the discharge pipe at a position corresponding to each second guide chamber, and the two guide holes respectively correspond to the two first guide chambers and are connected so that the fluid flows alternately through the first guide chamber and the second guide chamber in sequence and is discharged through the discharge pipe.

[0015] In some embodiments, the bottom of the guide hole arranged at the higher end of the first spoiler is located in the same plane as the top of one of the second spoilers, and the bottom of the guide hole arranged at the lower end of the first spoiler is located in the same plane as the top of the lower end of the first spoiler.

[0016] In some embodiments, the second spoiler is arranged in a ring shape.

[0017] In some embodiments, the tubular reaction device in compound fertilizer production also includes a discharge pipe and a material guiding structure, one end of the discharge pipe is connected to the discharge pipe, and the other end of the discharge pipe is connected to the nozzle, and the material guiding end of the material guiding structure is arranged in the discharge pipe and is used to guide the fluid to the nozzle.

[0018] In some embodiments, the material guiding structure includes a second motor and a second screw rod. The second screw rod is coaxially rotatable and arranged inside the discharge pipe. The second motor is arranged on one side of the discharge pipe and the drive shaft of the second motor passes through the discharge pipe and is connected to the second screw rod.

[0019] In some embodiments, a grid plate is provided in the diversion cavity, and the grid plate is arranged on the outside of the partition.

[0020] Compared with the prior art, the beneficial effects of the present invention include: the fluid is evenly distributed and diverted by the diversion chamber and the diversion hole to achieve diversion and mixing of the fluid, and the dynamic introduction and mixing are performed before and after the diversion by setting a dynamic mixing structure, thereby improving the mixing degree of different raw materials in the internal fluid fertilizer, so as to realize continuous fertilizer production and help improve granulation performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a stereogram of an embodiment of a tubular reaction device for compound fertilizer production provided by the present invention;

[0022] Figure 2 yes Figure 1 The main cross-sectional view of the tubular reaction device in use in the production of compound fertilizer;

[0023] Figure 3 yes Figure 1 A front cross-sectional view of a tubular reaction device in compound fertilizer production;

[0024] Figure 4 yes Figure 1 A partial front cross-sectional view of a tubular reaction device in compound fertilizer production;

[0025] Figure 5 yes Figure 1 The front view and cross-section diagram of the static mixing structure installation of the tubular reaction device in the production of compound fertilizer.

[0026] In the figure: 1. inner tube; 11. partition; 12. first mixing chamber; 13. second mixing chamber; 14. discharge pipe; 2. outer tube; 21. first pipeline; 22. second pipeline; 23. third pipeline; 24. flow-equalizing chamber; 25. flow-equalizing hole; 26. diverter chamber; 27. diverter hole; 3. dynamic mixing structure; 31. first motor; 32. first screw rod; 4. static mixing structure; 41. first baffle plate; 42. second baffle plate; 43. first flow guide chamber; 44. second flow guide chamber; 45. flow guide hole; 5. liquid ammonia inlet pipe; 6. steam inlet pipe; 7. sulfuric acid inlet pipe; 8. nozzle; 9. discharge pipe; 10. material guide structure; 101. second motor; 102. second screw rod. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0028] like Figures 1 to 4 As shown, the present invention provides a tubular reaction device for compound fertilizer production, comprising: an inner tube 1, an outer tube 2, a dynamic mixing structure 3, a liquid ammonia inlet pipe 5, a steam inlet pipe 6, a sulfuric acid inlet pipe 7 and a nozzle 8.

[0029] The inner tube 1 is provided with a partition plate 11 for dividing the interior of the inner tube 1 and forming a first mixing chamber 12 and a second mixing chamber 13 from the feed end to the discharge end thereof.

[0030] The outer tube 2 includes a first pipe 21 and a second pipe 22 which are connected to each other. A flow equalization chamber 24 connected to the first mixing chamber 12 is formed between the first pipe 21 and the inner tube 1. Flow equalization holes 25 and flow diversion holes 27 are respectively opened around the inner tube 1 at positions corresponding to the first pipe 21 and the second pipe 22 on the inner tube 1. A flow diversion chamber 26 surrounding the outside of the partition 11 is formed between the second pipe 22 and the inner tube 1. The flow diversion chamber 26 is respectively connected to the first mixing chamber 12 and the second mixing chamber 13 through the flow diversion holes 27.

[0031] The dynamic mixing structure 3 includes a driving member and a mixing member. The mixing member passes through the partition 11 and its two ends are respectively arranged in the first mixing chamber 12 and the second mixing chamber 13. The driving member is connected to the mixing member to drive the mixing member to rotate to stir the fluid in the first mixing chamber 12 and the second mixing chamber 13.

[0032] The liquid ammonia inlet pipe 5 and the steam inlet pipe 6 are both connected to the feed end of the inner tube 1, the sulfuric acid inlet pipe 7 is connected to the flow equalization chamber 24, and the nozzle 8 is connected to the second mixing chamber 13 for extending into the granulation cylinder and spraying to the material layer.

[0033] In the device, the liquid ammonia inlet pipe 5 can transport liquid ammonia to the inner tube 1, the steam inlet pipe 6 purges steam into the inner tube 1 to preheat the liquid nitrogen, one end of the mixing element is arranged in the first mixing chamber 12 and agitates the liquid nitrogen in the first mixing chamber 12 under the drive of the driving element, the liquid ammonia inlet pipe 5 and the steam inlet pipe 6 are arranged at a certain distance from the sulfuric acid inlet pipe 7, so that the arrangement of the mixing element can fully preheat the liquid nitrogen and convert the liquid ammonia into gaseous ammonia, the concentrated sulfuric acid and dilute phosphoric acid sent from the storage tank and the washing liquid sent from the tail gas washing system are sent to the sulfuric acid inlet pipe 7 after dilution and metering, and are transported to the sulfuric acid inlet pipe 7. It is sent to the flow-equalizing chamber 24, and flows into the inner tube 1 from all sides through the flow-equalizing holes 25 arranged around the inner tube 1, so that the mixed acid can be evenly distributed in the liquid ammonia, and then it is evenly diverted to the diversion chamber 26 through the diversion pipe, and flows into the second mixing chamber 13 through the diversion holes 27 on the other side. The other end of the mixing element can rotate synchronously with the driving of the driving element to stir the fluid in the second mixing chamber 13, so as to achieve a full reaction between the mixed acid and the gaseous ammonia, and finally it is evenly sprayed onto the material layer of the granulation drum through the nozzle 8, so that the dry and wet materials can be agglomerated into granules under the rotation of the granulation drum.

[0034] Furthermore, valves are provided on the liquid ammonia inlet pipe 5, the steam inlet pipe 6 and the sulfuric acid inlet pipe 7 to control the inflow of liquid ammonia, steam and sulfuric acid.

[0035] like Figure 3 As shown, in some embodiments, the tubular reaction device in the production of compound fertilizer also includes a discharge pipe 9 and a material guiding structure 10, one end of the discharge pipe 9 is connected to the discharge pipe 14, and the other end of the discharge pipe 9 is connected to the nozzle 8, so that the raw material flows to the nozzle 8 through the discharge end and is sprayed out through the nozzle 8, the material guiding structure 10 includes a second motor 101 and a second screw rod 102, the second screw rod 102 is coaxially arranged inside the discharge pipe 9, the second motor 101 is arranged on one side of the discharge pipe 9 and the driving shaft of the second motor 101 passes through the discharge pipe 9 and is connected to the second screw rod 102, so as to drive the second screw rod 102 to rotate, so that the raw material can be delivered to the nozzle 8 for active spraying, and the screw rod can scrape the inner wall of the discharge pipe 9 to avoid raw material accumulation or blockage.

[0036] Furthermore, the material guiding structure 10 may also be other devices capable of pressurizing the nozzle 8 .

[0037] like Figure 3 , Figure 4As shown, in some embodiments, the driving member includes a first motor 31, and the mixing member includes a first screw rod 32. The first screw rod 32 is coaxially rotatable and arranged inside the inner tube 1. The first motor 31 is arranged on one side of the inner tube 1 and the driving shaft of the first motor 31 passes through the inner tube 1 and is connected to the first screw rod 32 to drive the first screw rod 32 to rotate. In addition, the spiral direction of the first screw rod 32 is opposite to the flow direction of the fluid in the inner tube 1. The inner tube 1 is arranged vertically when in use, so the fluid flows from top to bottom in the inner tube 1, and the first screw rod 32 spirally rotates upward, which can drive part of the fluid upward to increase the reaction time of the fluid and stir it at the same time to ensure that the fluid reacts fully.

[0038] Further, the driving member may also include a cylinder, and the mixing member includes a mixing rod, which is driven by the cylinder to swing up and down in the first mixing chamber 12 and the second mixing chamber 13 to achieve stirring of the materials. In the present invention, the dynamic mixing structure 3 is preferably a motor and a screw rod.

[0039] In order to improve the stability of the first screw rod 32 during operation, Figure 1 As shown, in some embodiments, the first spiral rod 32 is connected to the partition plate 11 through a bearing, and a sealing ring is provided on the bearing.

[0040] like Figure 4 As shown, in some embodiments, a mesh plate is provided in the diversion chamber 26, and the mesh plate is arranged on the outside of the partition 11, so that when the raw materials in the first mixing chamber 12 pass through the diversion chamber 26, they are divided again by the mesh plate to further increase the degree of mixing between the raw materials.

[0041] like Figure 5As shown, in some embodiments, the outer tube 2 further includes a third pipe 23 connected to one end of the second pipe 22, and a discharge pipe 14 is formed at a position corresponding to the discharge end portion of the inner tube 1 and the third pipe 23. The tubular reaction device in the production of compound fertilizer further includes a static mixing structure 4, the static mixing structure 4 includes a plurality of first baffles 41 obliquely arranged in the discharge pipe 14 and used to separate the discharge pipe 14 to form a plurality of first guide chambers 43, and a plurality of second baffles 42 arranged between the discharge pipe 14 and the third pipe 23 and used to separate the discharge pipe 14 and the third pipe 23 to form a plurality of second guide chambers 44, the first baffles The plate 41 is connected to the inner wall of the discharge pipe 14, the second baffle plate 42 is arranged in a ring shape, the inner side of the second baffle plate 42 is fixedly connected to the discharge pipe 14, and the outer side is fixedly connected to the third pipe 23, and the first baffle plate 41 and the second baffle plate 42 are arranged in sequence at intervals, and two guide holes 45 are provided on the discharge pipe 14 at positions corresponding to each second guide cavity 44, and the two guide holes 45 correspond to and are connected with the two first guide cavities 43 respectively, so that the fluid can flow alternately through the first guide cavity 43 and the second guide cavity 44 in sequence and be discharged through the discharge pipe 14, so as to realize static mixing of the fluid, thereby further improving the mixing degree of the raw materials.

[0042] Furthermore, in some embodiments, the bottom of the guide hole 45 provided at the higher end of the first baffle plate 41 is located in the same plane as the top of one of the second baffle plates 42, and the bottom of the guide hole 45 provided at the lower end of the first baffle plate 41 is located in the same plane as the top of the lower end of the first baffle plate 41, so that the guide hole 45 for discharging the fluid from the first guide cavity 43 to the second guide cavity 44 is located in the same plane as the bottom of the second guide cavity 44, and the guide hole 45 for discharging the fluid from the second guide cavity 44 to the first guide cavity 43 is located in the same plane as the bottom of the first guide cavity 43, so as to avoid residual liquid in the first guide cavity 43 or the second guide cavity 44.

[0043] Working principle: liquid ammonia enters the first mixing chamber 12 through the liquid ammonia inlet pipe 5, the steam inlet pipe 6 blows steam into the inner pipe 1 to preheat the liquid nitrogen, the first motor 31 drives the first screw rod 32 to rotate and stir the liquid nitrogen, so that the liquid nitrogen is fully preheated and can convert the liquid ammonia into gaseous ammonia, the concentrated sulfuric acid and dilute phosphoric acid sent from the storage tank and the washing liquid sent from the tail gas washing system are sent to the sulfuric acid inlet pipe 7 after dilution and metering, and are transported to the equalizing chamber 24, and then evenly distributed to the liquid ammonia through the equalizing hole 25, and then evenly divided to the distribution pipe. The raw materials flow into the flow cavity 26 and are concentratedly flowed into the second mixing cavity 13 through the diversion hole 27 on the other side. The mixed acid and the gaseous ammonia are fully reacted by the stirring of the first screw rod 32. Then the raw materials flow alternately through the first guide cavity 43 and the second guide cavity 44 in turn and are discharged to the discharge pipe 9 through the discharge pipe 14. The second motor 101 drives the second screw rod 102 to rotate to introduce the raw materials into the nozzle 8. Finally, the raw materials are evenly sprayed onto the material layer of the granulation cylinder through the nozzle 8, so that the dry and wet materials can be agglomerated into granules under the rotation of the granulation cylinder.

[0044] The present invention evenly distributes and diverts the fluid by means of the diversion chamber 26 and the diversion hole 27 to achieve diversion and mixing of the fluid, and then dynamically introduces and mixes the fluid before and after the diversion by means of the dynamic mixing structure 3, thereby improving the mixing degree of different raw materials in the internal fluid fertilizer, so as to achieve continuous fertilizer production and help improve granulation performance.

[0045] The specific implementation of the present invention described above does not constitute a limitation on the protection scope of the present invention. Any other corresponding changes and modifications made based on the technical concept of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A tubular reaction device for compound fertilizer production, characterized in that: include: An inner tube, wherein the inner tube is provided with a partition plate for dividing the interior of the inner tube and forming a first mixing chamber and a second mixing chamber from the feed end to the discharge end thereof; An outer tube, the outer tube includes a first tube and a second tube connected to each other, a flow-equalizing chamber connected to the first mixing chamber is formed between the first tube and the inner tube, flow-equalizing holes and flow-dividing holes are respectively opened around the inner tube at positions corresponding to the first tube and the second tube, a flow-dividing chamber surrounding the outer side of the partition is formed between the second tube and the inner tube, and the flow-dividing chamber is respectively connected to the first mixing chamber and the second mixing chamber through the flow-dividing holes; A dynamic mixing structure, the dynamic mixing structure comprising a driving member and a mixing member, the mixing member passes through the partition and has two ends disposed in the first mixing chamber and the second mixing chamber respectively, the driving member is connected to the mixing member to drive the mixing member to rotate so as to stir the fluid in the first mixing chamber and the second mixing chamber; A liquid ammonia inlet pipe, a steam inlet pipe, a sulfuric acid inlet pipe and a nozzle, wherein the liquid ammonia inlet pipe and the steam inlet pipe are both connected to the feed end of the inner tube, the sulfuric acid inlet pipe is connected to the flow-averaging chamber, and the nozzle is connected to the second mixing chamber so as to extend into the granulation cylinder and spray onto the material layer.

2. The tubular reaction device for compound fertilizer production according to claim 1, characterized in that: The driving member includes a first motor, and the mixing member includes a first screw rod, the first screw rod is coaxially rotatable inside the inner tube, the first motor is arranged at one side of the inner tube, and the driving shaft of the first motor passes through the inner tube and is connected to the first screw rod.

3. The tubular reaction device for compound fertilizer production according to claim 2, characterized in that: The spiral direction of the first spiral rod is opposite to the flow direction of the fluid in the inner tube, and the inner tube is arranged vertically when in use.

4. The tubular reaction device for compound fertilizer production according to claim 2, characterized in that: The first spiral rod is connected to the partition plate through a bearing, and a sealing ring is provided on the bearing.

5. The tubular reaction device for compound fertilizer production according to claim 1, characterized in that: The outer tube also includes a third pipe connected to one end of the second pipe, and the discharge end portion of the inner tube forms a discharge pipe at a position corresponding to the third pipe. The tubular reaction device in the compound fertilizer production also includes a static mixing structure, which includes a plurality of first baffles obliquely arranged in the discharge pipe and used to separate the discharge pipe to form a plurality of first guide chambers, and a plurality of second baffles arranged between the discharge pipe and the third pipe and used to separate the discharge pipe and the third pipe to form a plurality of second guide chambers, and the first baffles and the second baffles are arranged in sequence at intervals, and two guide holes are provided on the discharge pipe at a position corresponding to each of the second guide chambers, and the two guide holes correspond to the two first guide chambers respectively and are connected so that the fluid flows alternately through the first guide chamber and the second guide chamber in sequence and is discharged through the discharge pipe.

6. The tubular reaction device for compound fertilizer production according to claim 5, characterized in that: The bottom of the guide hole arranged at the higher end of the first spoiler is located in the same plane as the top of one of the second spoilers, and the bottom of the guide hole arranged at the lower end of the first spoiler is located in the same plane as the top of the lower end of the first spoiler.

7. The tubular reaction device for compound fertilizer production according to claim 5, characterized in that: The second spoiler is arranged in a ring shape.

8. The tubular reaction device for compound fertilizer production according to claim 5, characterized in that: The tubular reaction device in the compound fertilizer production also includes a discharge pipe and a material guiding structure. One end of the discharge pipe is connected to the discharge pipe, and the other end of the discharge pipe is connected to the nozzle. The material guiding end of the material guiding structure is arranged in the discharge pipe and is used to guide the fluid to the nozzle.

9. The tubular reaction device for compound fertilizer production according to claim 8, characterized in that: The material guiding structure includes a second motor and a second screw rod. The second screw rod is coaxially rotatable and arranged inside the discharge pipe. The second motor is arranged on one side of the discharge pipe and the driving shaft of the second motor passes through the discharge pipe and is connected to the second screw rod.

10. The tubular reaction device for compound fertilizer production according to claim 1, characterized in that: A grid plate is provided in the diversion cavity, and the grid plate is arranged on the outside of the partition plate.

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