Compound fertilizer slurry filtering device and high-tower granulation device

Abstract

The utility model relates to the technical field of compound fertilizer production, in particular to a compound fertilizer slurry filtering device and a high-tower granulation device. The compound fertilizer slurry filtering device comprises a filter and a slag discharging device, the filter comprises a first shell, a feeding pipe and a discharging pipe are connected to the first shell, the filter is used for being connected to a slurry pipeline through the feeding pipe and the discharging pipe, a filtering piece is arranged in the first shell, and the slag discharging device is arranged in the filtering piece. The filtering piece is located between the feeding pipe and the discharging pipe so as to filter out filter residues in slurry; the residue discharging device comprises a second shell, a spiral blade and a driving assembly, one end of the spiral blade is located in the second shell, the other end of the spiral blade is located in the first shell, the driving assembly is used for driving the spiral blade to rotate so as to convey filter residues on the filtering part to the second shell, and the second shell is provided with a residue discharging opening used for discharging the filter residues. Impurities in the slurry can be filtered out by the filter, and the filtered impurities can be continuously discharged by the deslagging device; impurities in the filtered compound fertilizer slurry are reduced, and the spray head is not easy to block.

Description

Technical Field

[0001] This utility model relates to the field of compound fertilizer production technology, specifically to a compound fertilizer slurry filtration device and a high-tower granulation device. Background Technology

[0002] High-tower compound fertilizer granulation technology typically uses 2-4mm nozzles to propel the compound fertilizer slurry into droplets via centrifugal force. These droplets then cool and solidify into spherical granules as they fall within the tower. During granulation, insoluble substances such as iron filings, stones, and fibers in the slurry severely affect the nozzle's granulation efficiency, clogging the nozzles and extending the granulation time, thus increasing the workload for granulation workers. Furthermore, the high hardness of the granular residue in the slurry significantly impacts the service life of downstream rotating equipment such as emulsifiers and granulators; currently, the average service life of downstream rotating equipment is less than 30 days. Utility Model Content

[0003] The main technical problem this invention addresses is the issue of impurities in the slurry easily clogging the nozzles during the granulation process of high-tower compound fertilizer.

[0004] According to a first aspect, one embodiment provides a compound fertilizer slurry filtration device, including a filter and a slag discharge device. The filter includes a first housing, on which an inlet pipe and an outlet pipe are connected. The filter is used to be connected to a slurry pipeline through the inlet pipe and the outlet pipe. A filter element is disposed inside the first housing, and the filter element is located between the inlet pipe and the outlet pipe to filter out filter residue in the slurry.

[0005] The slag discharge device includes a second housing, a spiral blade, and a drive assembly. One end of the spiral blade is located inside the second housing, and the other end is located inside the first housing. The drive assembly is used to drive the spiral blade to rotate so as to transport the filter residue on the filter element to the second housing. The second housing is provided with a slag discharge port for discharging the filter residue.

[0006] In some embodiments, the filter element is a filter screen, which includes a grooved mesh and an end mesh. The grooved mesh is connected to the inner wall of the first housing, and the opening of the grooved mesh faces the feed pipe. The end mesh is connected to a first end of the grooved mesh, and the second end of the grooved mesh is open to allow the spiral blades to be arranged within the grooved mesh.

[0007] In some embodiments, the distance between the spiral blades and the groove mesh, as well as the distance between the spiral blades and the second housing, are both smaller than the filter pore diameter of the filter mesh.

[0008] In some embodiments, a first steam backflush port is provided between the end mesh and the first housing, and / or a second steam backflush port is provided between the groove mesh and the first housing.

[0009] In some embodiments, the outer periphery of the filter is provided with a heat insulation layer.

[0010] In some embodiments, the insulation layer is an insulation jacket, which is disposed on the outer periphery of the filter and has a steam inlet and a condensate outlet.

[0011] In some embodiments, the compound fertilizer slurry filtration device includes a striking element connected to the first housing or the second housing, the striking element being located above the spiral blade and used to strike the spiral blade during its rotation.

[0012] In some embodiments, a connecting flange is provided at the inlet of the feed pipe, and / or a connecting flange is provided at the outlet of the discharge pipe.

[0013] According to a second aspect, one embodiment provides a high-tower granulation apparatus, including a primary mixing tank, a secondary mixing tank, and an overflow pipe, wherein the overflow pipe is connected between the primary mixing tank and the secondary mixing tank;

[0014] The high-tower granulation device also includes the compound fertilizer slurry filtration device described in any of the above embodiments. The compound fertilizer slurry filtration device is connected to the overflow pipe, and the axis of the spiral blades of the compound fertilizer slurry filtration device is perpendicular to the overflow pipe.

[0015] In some embodiments, the angle between the axis of the helical blade and the horizontal plane is 20 to 35 degrees.

[0016] According to the compound fertilizer slurry filtration device of the above embodiment, the filter is connected to the slurry pipeline, the filter element can filter out impurities in the slurry, and the slag discharge device includes a drive component and a spiral blade. The drive component drives the spiral blade to rotate, which can continuously discharge the filtered impurities from the filter. After filtration, the impurities in the compound fertilizer slurry are reduced, and it is not easy to clog the nozzle. Attached Figure Description

[0017] Figure 1 This is a front view of an embodiment of the compound fertilizer slurry filtration device of this utility model;

[0018] Figure 2 for Figure 1 A top view of the compound fertilizer slurry filtration device in the middle;

[0019] Figure 3 for Figure 1Right view of the compound fertilizer slurry filtration device in the middle;

[0020] Figure 4 This is a schematic diagram of the structure of the high-tower granulation device of this utility model.

[0021] Figure label:

[0022] 1. First shell; 11. Feed pipe; 12. Discharge pipe; 13. Filtration chamber; 14. First steam backflush port; 15. Second steam backflush port; 2. Filter element; 21. Tank mesh; 22. End mesh; 3. Second shell; 31. Slag discharge port; 32. Cover plate; 4. Spiral blade; 5. Drive assembly; 51. Drive motor; 52. Reducer; 6. Insulation jacket; 61. Steam inlet; 62. Condensate outlet; 63. Steam chamber; 7. Striking ball; 800. High tower granulation device; 81. Primary mixing tank; 82. Secondary mixing tank; 83. Overflow pipe; 84. Compound fertilizer slurry filtration device. Detailed Implementation

[0023] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Similar elements in different embodiments are referred to by related similar element reference numerals. In the following embodiments, many details are described to facilitate a better understanding of the present application. However, those skilled in the art will readily recognize that some features may be omitted in different situations, or may be replaced by other elements, materials, or methods. In some cases, certain operations related to the present application are not shown or described in the specification. This is to avoid obscuring the core parts of the present application with excessive description. For those skilled in the art, detailed description of these related operations is not necessary; they can fully understand the related operations based on the description in the specification and general technical knowledge in the art.

[0024] Furthermore, the features, operations, or characteristics described in the specification can be combined in any suitable manner to form various embodiments. At the same time, the steps or actions in the method description can be rearranged or adjusted in a manner obvious to those skilled in the art. Therefore, the various orders in the specification and drawings are only for the clear description of a particular embodiment and do not imply a necessary order, unless otherwise stated that a particular order must be followed.

[0025] The serial numbers assigned to components in this document, such as "first" and "second," are used only to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages).

[0026] Regarding the problem that impurities in the slurry can easily clog the nozzle, due to the high temperature, easy solidification and crystallization of compound fertilizer slurry and the presence of many impurities, conventional filters would require frequent replacement and cleaning of the filter canister, making them unsuitable for filtering compound fertilizer slurry.

[0027] Although vertical or horizontal emulsifiers can be used before granulation of high-tower compound fertilizer, and the basket of the emulsifier has a certain filtering effect, the basket of the emulsifier usually uses long strip holes of 10*130mm, so the filtering effect is limited. If a vibrating screen is used to screen the raw materials in the feed slurry tank to remove impurities, it will bring a lot of dust problems during the screening process.

[0028] Therefore, a filtration device for compound fertilizer slurry can be designed, including a filter and a slag discharge device. The filter is connected to the slurry pipeline to filter out impurities in the slurry. The slag discharge device adopts a spiral blade design 4, which can automatically and continuously discharge the filtered impurities, reducing the labor intensity of workers. At the same time, since the slurry is in a closed state in the filter during the filtration process, there is no risk of splashing and scalding. To solve the problem of the slurry easily solidifying and crystallizing, a steam insulation jacket 6 can also be installed on the outer periphery of the filter.

[0029] like Figures 1-3 As shown, one embodiment provides a compound fertilizer slurry filtration device, including a filter and a slag discharge device.

[0030] The filter includes a first housing 1, on which an inlet pipe 11 and an outlet pipe 12 are connected. The filter is used to connect to a slurry pipeline via the inlet pipe 11 and the outlet pipe 12. The first housing 1 can be a container with an internal chamber. The inlet pipe 11 and the outlet pipe 12 communicate with the internal chamber, respectively. Specifically, the inlet pipe 11 can be located on the upper side of the first housing 1, and the outlet pipe 12 can be located on the lower side of the first housing 1. Flanges can be provided at the ends of the inlet pipe 11 and the outlet pipe 12, and they can be connected in series to the slurry pipeline via the flanges.

[0031] The first housing 1 is equipped with a filter element 2, which is located between the feed pipe 11 and the discharge pipe 12 to filter out the filter residue in the slurry. The filter element 2 can be a filter screen, which divides the internal chambers of the first housing 1. The side of the filter screen near the feed pipe 11 is used to inject the slurry. After the slurry is filtered by the filter screen, impurities remain on the filter screen, while the filtrate passes through the filter screen and enters the side of the filter screen near the discharge pipe 12, i.e., the filtrate chamber 13. Then, the filtrate in the filtrate chamber 13 is discharged through the discharge pipe 12.

[0032] The slag discharge device includes a second housing 3, a spiral blade 4, and a drive assembly 5. One end of the spiral blade 4 is located inside the second housing 3, and the other end is located inside the first housing 1. The drive assembly 5 is used to drive the spiral blade 4 to rotate, so as to transport the filter residue on the filter element 2 to the second housing 3. The second housing 3 and the first housing 1 can be fixed together by fasteners. The mating surface of the two can be provided with a mating interface for the spiral blade 4 to pass through, so that the spiral blade 4 can transport the filter residue in the first housing 1 to the second housing 3.

[0033] The second housing 3 may be provided with a discharge port 31 for discharging filter cake. Specifically, the discharge port 31 is located on the lower side of the second housing 3, and also on the lower side of the first end of the spiral blade 4, so that the filter cake conveyed by the spiral blade 4 falls into the discharge port 31. A filter cake collection tank or bucket may be provided on the lower side of the discharge port 31. In addition, the second housing 3 may also be provided with a removable cover plate 32 to facilitate cleaning or maintenance and replacement of the spiral blade 4 inside the second housing 3.

[0034] In this embodiment, the spiral blade 4 is shaftless, which can transport impurities with larger particle sizes. Furthermore, since axial support is not required, the required installation space is small, making the overall structure of the filtration device more compact. In other embodiments, the spiral blade 4 may also have a central shaft.

[0035] In the compound fertilizer slurry filtration device of the above embodiment, the filter is connected to the slurry pipeline. The filter element 2 can filter out impurities in the slurry. The slag discharge device includes a drive component 5 and a spiral blade 4. The drive component 5 drives the spiral blade 4 to rotate, which can continuously discharge the filtered impurities from the filter. After filtration, the impurities in the compound fertilizer slurry are reduced, making it less likely to clog the nozzles. This extends the high-tower granulation time by more than 2 hours, increases the high-tower granulation yield by more than 5%, and also improves the service life of the emulsifier and granulator nozzles. In the above filtration process, the slag discharge is automatic, which is suitable for compound fertilizer slurries with a lot of impurities and reduces the labor intensity of workers. The slurry is in a relatively closed state, which reduces the risk of splashing and burns.

[0036] In some embodiments, such as Figures 1-3 As shown, the filter element 2 is a filter screen, which includes a grooved mesh 21 and an end mesh 22. The grooved mesh 21 is connected to the inner wall of the first housing 1, and the opening of the grooved mesh 21 faces the feed pipe 11. The grooved mesh 21 is U-shaped, with the bottom being an arc shape adapted to the outer periphery of the spiral blade 4, which facilitates the timely discharge of filter residue from the filter screen by the spiral blade 4. The end mesh 22 is planar and connected to the first end of the grooved mesh 21. The second end of the grooved mesh 21 is open to allow the spiral blade 4 to be arranged inside the grooved mesh 21.

[0037] In the above embodiments, the filter screen includes a grooved screen 21 and an end screen 22, which not only facilitates the configuration of the spiral blades 4 and timely discharge of filter residue, but also increases the filtration area and improves the filtration efficiency of the slurry compared to a single planar filter screen.

[0038] In some embodiments, such as Figure 1 As shown, the distance between the spiral blade 4 and the groove mesh 21, as well as the distance between the spiral blade 4 and the second housing 3, are both smaller than the diameter of the filter mesh pores. This arrangement prevents impurities from passing through the filter mesh and getting stuck between the spiral blade 4, the groove mesh 21, and the second housing 3.

[0039] In some embodiments, such as Figure 1 As shown, a first steam backflush port 14 is provided between the end mesh 22 and the first housing 1, and a second steam backflush port 15 is provided between the trough mesh 21 and the first housing 1. Specifically, the first steam backflush port 14 and the second steam backflush port 15 are both connected to the first housing 1 and located in the dead corner position inside the first housing 1, which can prevent the slurry from accumulating in the dead corner position inside the first housing 1.

[0040] Both the first steam backflushing port 14 and the second steam backflushing port 15 are located on the side of the filter screen near the discharge port, i.e., inside the filtrate chamber 13, to facilitate the spraying of steam toward the filter screen, causing impurities adhering to the filter screen to fall off and be transported away by the spiral blades 4. The first steam backflushing port 14 has an acute angle with the bottom of the trough mesh 21, and the second steam backflushing port 15 has an acute angle with the end mesh 22. This arrangement increases the purging area and improves the purging effect on the filter screen.

[0041] In addition, the first steam backflush port 14 and the second steam backflush port 15 are used not only to clean the filter screen during the filtration process, but also to preheat the filter device before operation and to clean the filter screen.

[0042] In some embodiments, such as Figure 1 As shown, the insulation layer is an insulation jacket 6, which is disposed on the outer periphery of the filter. The insulation jacket 6 is provided with a steam inlet 61 and a condensate outlet 62. Specifically, the insulation jacket 6 covers the feed pipe 11, the first housing 1, and the discharge pipe 12, and forms a steam chamber 63 between the insulation jacket 6 and the feed pipe 11, the first housing 1, and the discharge pipe 12. The steam inlet 61 is used to introduce high-temperature steam, and the condensate from the high-temperature steam is discharged from the condensate outlet 62. The insulation jacket 6 can maintain the temperature of the slurry during the slurry filtration process and reduce slurry crystallization.

[0043] In other embodiments, the filter is wrapped with an insulating material, such as insulating cotton. Alternatively, an electric heating device may be provided on the outer periphery of the filter.

[0044] In some embodiments, such as Figure 1 As shown, the compound fertilizer slurry filtration device includes a striking element connected to the first housing 1 or the second housing 3. The striking element is located on the upper side of the spiral blade 4 and is used to strike the spiral blade 4 during its rotation.

[0045] Specifically, the striking element can be a solid striking ball 7, which can be suspended from the first housing 1 and the second housing 3 by ropes or springs. When the spiral blade 4 rotates, the striking ball 7, resting on the spiral blade 4, can move along the conveying direction with the spiral blade 4. However, after moving a certain distance, due to the restriction of the ropes, the striking ball 7 will pass over the spiral blade 4 and then move in the opposite direction to strike the spiral blade 4. The striking process can vibrate the spiral blade 4, reducing the crystallization of slurry on the spiral blade 4, and also causing the crystals on the spiral blade 4 to fall off.

[0046] There can be one or more striking balls 7, arranged at intervals along the conveying direction of the spiral blades 4. For example, in this embodiment, one striking ball 7 is suspended inside the first housing 1, and two striking balls 7 are suspended inside the second housing 3.

[0047] In some embodiments, such as Figure 1 As shown, the drive assembly 5 includes a drive motor 51 and a reducer 52. The drive motor 51 and the reducer 52 can be mounted and fixed by a bracket. The reducer 52 can reduce the speed of the drive motor 51 while increasing the torque, achieving a low-speed and stable slag discharge effect.

[0048] According to the second aspect, such as Figure 4 As shown, one embodiment provides a high-tower granulation device 800, including a primary mixing tank 81, a secondary mixing tank 82 and an overflow pipe 83, wherein the overflow pipe 83 is connected between the primary mixing tank 81 and the secondary mixing tank 82.

[0049] The high-tower granulation device 800 also includes a compound fertilizer slurry filtration device 84 as described in any of the above embodiments. The compound fertilizer slurry filtration device 84 is connected to the overflow pipe 83, and the axis of the spiral blades 4 of the compound fertilizer slurry filtration device 84 is perpendicular to the overflow pipe 83, which facilitates the separation of filter residue during filtration. The structure of the compound fertilizer slurry filtration device 84 has been described above and will not be repeated here.

[0050] In some embodiments, the angle between the axis of the spiral blade 4 and the horizontal plane is 20-35 degrees. If the angle is smaller than this range, the slurry is more likely to flow out from the discharge port 34, resulting in significant slurry loss. If the angle is larger than this range, the spiral blade 4 has difficulty discharging filter residue larger than the filter pore size from the discharge port 31. Therefore, when the angle between the axis of the spiral blade 4 and the horizontal plane is 20-35 degrees, the slurry is less likely to be lost and the filter residue is easier to discharge, resulting in better filtration.

[0051] The above-described specific examples are for illustrative purposes only and are not intended to limit the scope of this invention. Those skilled in the art to which this invention pertains can make various simple deductions, modifications, or substitutions based on the concept of this invention.

Claims

1. A compound fertilizer slurry filtration device, characterized in that, Includes filters and slag discharge devices. The filter includes a first housing, on which an inlet pipe and an outlet pipe are connected. The filter is connected to a slurry pipeline through the inlet pipe and the outlet pipe. A filter element is disposed inside the first housing, and the filter element is located between the inlet pipe and the outlet pipe to filter out filter residue in the slurry. The slag discharge device includes a second housing, a spiral blade, and a drive assembly. One end of the spiral blade is located inside the second housing, and the other end is located inside the first housing. The drive assembly is used to drive the spiral blade to rotate so as to transport the filter residue on the filter element to the second housing. The second housing is provided with a slag discharge port for discharging the filter residue.

2. The compound fertilizer slurry filtration device according to claim 1, characterized in that, The filter element is a filter screen, which includes a grooved mesh and an end mesh. The grooved mesh is connected to the inner wall of the first housing, and the opening of the grooved mesh faces the feed pipe. The end mesh is connected to the first end of the grooved mesh, and the second end of the grooved mesh is open to allow the spiral blades to be arranged inside the grooved mesh.

3. The compound fertilizer slurry filtration device according to claim 2, characterized in that, The distance between the spiral blade and the groove mesh, as well as the distance between the spiral blade and the second housing, are both smaller than the filter pore diameter of the filter mesh.

4. The compound fertilizer slurry filtration device according to claim 2, characterized in that, A first steam backflush port is provided between the end mesh and the first housing, and / or a second steam backflush port is provided between the groove mesh and the first housing.

5. The compound fertilizer slurry filtration device according to claim 1, characterized in that, The filter is provided with an insulation layer on its outer periphery.

6. The compound fertilizer slurry filtration device according to claim 5, characterized in that, The insulation layer is an insulation jacket, which is disposed on the outer periphery of the filter. The insulation jacket is provided with a steam inlet and a condensate outlet.

7. The compound fertilizer slurry filtration device according to claim 1, characterized in that, It includes a striking element connected to the first housing or the second housing, the striking element being located above the helical blade and used to strike the helical blade during its rotation.

8. The compound fertilizer slurry filtration device according to any one of claims 1-7, characterized in that, The feed pipe is provided with a connecting flange at the feed inlet, and / or the discharge pipe is provided with a connecting flange at the discharge outlet.

9. A high-tower granulation device, characterized in that, It includes a primary mixing tank, a secondary mixing tank, and an overflow pipe, wherein the overflow pipe is connected between the primary mixing tank and the secondary mixing tank; The high-tower granulation device further includes a compound fertilizer slurry filtration device as described in any one of claims 1-8, wherein the compound fertilizer slurry filtration device is connected to the overflow pipe, and the axis of the spiral blades of the compound fertilizer slurry filtration device is perpendicular to the overflow pipe.

10. The high-tower granulation apparatus according to claim 9, characterized in that, The angle between the axis of the helical blade and the horizontal plane is 20 to 35 degrees.

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