Organic fertilizer particle drying device

Abstract

The utility model discloses an organic fertilizer granule drying device, including drying tower body, the inside of drying tower body is hollow structure and forms the heat preservation inner chamber, is equipped with the helical pipe way that spirals down around drying tower body centre axis in the heat preservation inner chamber, the diameter of helical pipe way gradually increases from top to bottom and equal adjacent pitch, makes helical angle gradually slow down from top to bottom, the helical pipe way is connected by three -way quick -mounting flange end portion of a plurality of independent helical section and constitutes, the shallow helical flow guide grain is seted up in the helical pipe way inner wall, the vertical hot -blast conveying pipe is equipped with in helical pipe way centre axis position, and the hot -blast conveying pipe is communicated with three -way quick -mounting flange through distribution pipe, and the every tooth top wall of helical pipe way is equipped with the water vapor evaporation mouth. The utility model discloses can avoid mechanical damage, and can guarantee the drying uniformity technical scheme, especially suitable for the moderate drying scene of fragile material.

Description

Technical Field

[0001] This utility model relates to the field of fertilizer processing technology, specifically to an organic fertilizer granule drying device. Background Technology

[0002] In existing technologies, the drying of organic fertilizer granules often employs a stirring and scattering type drying device. This type of device uses a mechanical stirrer to repeatedly lift and scatter the granules in a hot air stream, utilizing the direct contact between the hot air and the material to achieve moisture evaporation. However, for the relatively fragile organic fertilizer granules, the impact and friction forces experienced by the wet granules during mechanical stirring and scattering can easily lead to structural damage or even pulverization. Granule breakage not only reduces the yield and wastes material, but also increases the risk of equipment blockage due to powder accumulation.

[0003] Chinese patent CN221898155U discloses a drying device for organic fertilizer production granules. The device has a feed hopper on one side, with a transfer box connected to the bottom. One side of the transfer box is connected to the main body of the drying device, and the other side is connected to an extension shell. A mounting plate is fixedly connected to the end of the extension shell, and a filter frame is fixedly connected inside the mounting plate. A drying assembly is fixedly connected inside the extension shell for heating the air inside. A drive mechanism is located on one side of the filter frame and connected to the drying assembly. This invention solves the problem mentioned in the background art: existing drying devices typically use hot air to dry the fertilizer, which can easily accumulate after excessive fertilizer enters the device, significantly reducing drying efficiency. However, in this patent, the organic fertilizer particles rotate along with the rotating shell and heat transfer plate. This process causes the particles to scatter. This structure inevitably exacerbates the collision between particles and the hard contact between particles and metal parts, which is especially damaging to organic fertilizer particles with high humidity and low strength. Summary of the Invention

[0004] The purpose of this invention is to provide an organic fertilizer granule drying device that can avoid mechanical damage and ensure uniform drying. It is especially suitable for the gentle drying of fragile materials and solves the problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: An organic fertilizer granule drying device includes a drying tower body with a hollow internal structure forming an insulated inner cavity. A spiral pipe, spiraling downwards around the central axis of the drying tower body, is arranged within the insulated inner cavity. The diameter of the spiral pipe gradually increases from top to bottom, and adjacent spiral pitches are equal, causing the spiral angle to gradually decrease from top to bottom. The spiral pipe is composed of multiple independent spiral segments connected at the ends by a tee quick-connect flange. Shallow spiral guide lines are formed on the inner wall of the spiral pipe. A vertical hot air delivery pipe is located at the central axis of the spiral pipe, and the hot air delivery pipe is connected to the tee quick-connect flange via a distribution pipe. A water vapor evaporation port is formed on the top wall of each thread of the spiral pipe.

[0006] Preferably, a mesh screen is provided at the connection between the distribution pipe and the spiral pipe.

[0007] Preferably, the top of the spiral pipe extends out of the drying tower body and connects to the particle feed hopper, while the bottom is connected to the discharge pipe.

[0008] Preferably, a heating resistance wire is embedded in the inner wall of the drying tower.

[0009] Preferably, the shallow spiral guide pattern extends continuously along the circumferential direction of the inner wall of the spiral pipe, and the pattern depth is 0.5-2mm.

[0010] Preferably, the drying tower body has a frustum-shaped structure that is narrower at the top and wider at the bottom.

[0011] Preferably, the inner wall of the spiral pipe is coated with a non-stick coating.

[0012] Preferably, an exhaust pipe is provided at the top of the drying tower.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows: 1. This utility model uses a gravity-driven spiral pipe as the core drying channel. As wet particles fall within the pipe, they are constrained by centrifugal force and the pipe wall, naturally forming a combined motion of orbiting the axis and rolling on their own. This ensures the particles are fully dispersed and continuously changes the heat-receiving point, significantly improving heating uniformity. The inner wall of the spiral pipe is smooth and coated with a non-stick coating, combined with shallow spiral flow-guiding patterns, effectively preventing wet, sticky materials from adhering and clogging, while guiding the particles to maintain a stable rolling state, greatly reducing the risk of mechanical damage to brittle particles during the drying process. 2. This invention achieves efficient combined heating through heat conduction and convection: the heating resistance wire directly heats the spiral pipe wall, allowing the rolling particles to continuously receive conductive heat; the hot air delivery pipe injects hot air into each spiral section through the distribution pipe, penetrating the falling particle layer to provide convective heating. Segmented hot air injection supports temperature gradient control, and the water vapor evaporation port promptly discharges moisture to avoid secondary adsorption. The dual heating effect significantly shortens drying time and reduces energy consumption. The modular spiral section design, combined with the tee quick-install flange, makes local cleaning and maintenance convenient and efficient, reducing long-term operating costs. 3. The spiral pipe of this utility model has a large-angle upper section that accelerates the passage of wet material and prevents blockage, while the small-angle lower section extends the residence time of semi-dry material to ensure thorough drying. This device relies entirely on gravity to drive the material movement, has no complex mechanical transmission parts, has a simple and reliable structure, low maintenance costs, and is especially suitable for continuous production needs. Attached Figure Description

[0014] Figure 1 This is an isometric view of the overall structure of this utility model; Figure 2 This is a cross-sectional view of the drying tower body of this utility model; Figure 3 This is an isometric view of the helical segment of this utility model; Figure 4 This is a cross-sectional view of the spiral pipe of this utility model; Figure 5 This is a diagram showing the distribution of the heating resistance wire in this invention. Figure 6 This is an isometric drawing of the tee quick-connect flange of this utility model.

[0015] In the diagram: 1. Drying tower body; 2. Insulated inner cavity; 3. Spiral pipe; 4. Tee quick-connect flange; 5. Spiral section; 6. Heating resistance wire; 7. Shallow spiral guide pattern; 8. Hot air conveying pipe; 9. Distribution pipe; 10. Partition screen; 11. Particle feed hopper; 12. Water vapor evaporation port; 13. Exhaust pipe; 14. Feed pipe; 15. Heater. Detailed Implementation

[0016] 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.

[0017] To address the problem of organic fertilizer granules easily breaking and crumbling during the spreading and drying process in existing technologies, the following technical solution is provided. Please refer to [link / reference]. Figure 1-6 ; An organic fertilizer granule drying device includes a drying tower body 1, which has a frustum-shaped structure that is narrower at the top and wider at the bottom. An insulated inner cavity 2 is formed inside the drying tower body 1 to prevent heat loss and ensure uniform temperature distribution. Heating resistance wires 6 are embedded in the inner wall of the drying tower body 1 to further enhance the heat preservation effect.

[0018] The heat-insulating inner cavity 2 is equipped with a spiral pipe 3 that spirals down around the central axis of the drying tower body 1. The diameter of the spiral pipe 3 gradually increases from top to bottom, and the pitch of two adjacent threads of the spiral pipe 3 is equal. Therefore, the spiral inclination angle of the spiral pipe 3 gradually decreases from top to bottom. The core of the inclination angle design is to ensure that the material can slide down smoothly by gravity.

[0019] The large inclination angle of the upper spiral pipe 3 allows high-humidity, easily agglomerated particles to pass through quickly, preventing blockage. When the particles reach the lower spiral pipe 3, the humidity has been greatly reduced. At this stage, the material is heated to below the critical moisture content, and most of the moisture is evaporated. At this time, the particles are easy to flow. The small inclination angle design slows down the sliding and rolling speed of the particles, prolonging their residence time in the spiral pipe 3, so that they can be fully dried.

[0020] The heating resistance wire 6 not only has a heat preservation effect, but also heats the wall of the spiral pipe 3, thus conducting heat to the organic fertilizer particles moving inside.

[0021] The spiral pipe 3 has a circular cross-section. The inner wall of the spiral pipe 3 is kept smooth to promote the sliding and rolling of organic fertilizer particles. The inner wall of the spiral pipe 3 is provided with continuous shallow spiral guide lines 7. The shallow spiral guide lines 7 extend continuously along the circumference of the inner wall of the spiral pipe 3, and the depth of the lines is 0.5-2mm, which is used to guide and enhance the rotational movement of fertilizer particles.

[0022] The inner wall of the spiral pipe 3 is coated with a non-stick coating to prevent organic fertilizer from adhering.

[0023] The spiral pipe 3 is composed of several independent spiral segments 5 connected together. The segmented design makes local maintenance and cleaning simpler and reduces the maintenance cost of long-term operation. The ends of adjacent spiral segments 5 are connected by tee quick-connect flanges 4.

[0024] A vertical hot air conveying pipe 8 is installed at the central axis of the spiral pipe 3. Hot air rises from the bottom of the hot air conveying pipe 8 and continues to be sent into the spiral pipe 3 through the distribution pipe 9 connected between the hot air conveying pipe 8 and the three-way quick-connect flange 4 to heat the material that is spirally falling in the pipe. The hot air conveying pipe 8 is connected to the heater 15 installed below the drying tower body 1.

[0025] A mesh 10 is installed at the connection point between the distribution pipe 9 and the spiral pipe 3 to prevent materials from entering the distribution pipe 9 and clogging the hot air conveying line.

[0026] Each tooth of the spiral pipe 3 has a water vapor evaporation port 12 on its top wall. The moisture dried from the particles is discharged through the water vapor evaporation port 12 and finally discharged from the exhaust pipe 13 on the top surface of the drying tower body 1.

[0027] The top of the spiral pipe 3 extends out of the drying tower body 1 and connects to the particle feed hopper 11. Wet particles are fed into the spiral pipe 3 from the particle feed hopper 11 and begin to slide down the spiral pipe 3 under the action of gravity. Due to the bending of the pipe and the action of centrifugal force, the particles will slide close to the wall of the pipe. This motion can be decomposed as follows: the particles move in a spiral motion around the central axis along the sliding trajectory, forming a revolution around the axis. At the same time, the friction between the particles and the wall of the spiral pipe 3, as well as the friction between the particles, plus the spiral deformation of the spiral pipe 3 itself, will cause the particles to roll, that is, rotate. This forms a complex motion.

[0028] The aforementioned complex movement process of the particles not only allows them to fully disperse, improving heating uniformity, but also ensures that the hot air penetrates the falling particles, facilitating thorough heat and mass exchange with each particle undergoing complex movement. Simultaneously, the particles remain in constant contact with the heated spiral pipe wall 3, and the hot spot continuously changes during movement, guaranteeing uniform heating and efficient heat conduction. Through a combined heating mode of heat conduction and convection, heat is transferred simultaneously from both the inside and outside of the organic fertilizer particles, thus ensuring both drying speed and uniformity. This drying method is particularly suitable for processing particles with relatively fragile materials, as the particles are always in a rolling or sliding state within the pot, effectively preventing the breakage of wet particles during traditional scattering drying processes and maintaining their shape.

[0029] After being thoroughly and evenly dried, the granules reach the bottom and are discharged through the feed pipe 14 to enter the next process.

[0030] A pneumatic vibrator or high-frequency oscillator can be installed outside the spiral pipe 3. In the rare event of material bridging or slight adhesion, the vibrator can be activated to assist in clearing the blockage and ensure continuous material flow.

[0031] Working Principle: Wet organic fertilizer granules enter the spiral pipe 3 through the granule feed hopper 11 and begin to slide down under the influence of gravity. The spiral pipe 3 has a structure that spirals downwards around the central axis of the drying tower 1, with its diameter gradually increasing from top to bottom and the spiral angle decreasing accordingly. The large inclination angle at the top ensures that the high-humidity granules pass through quickly and prevent clogging, while the small inclination angle at the bottom slows down the granules' sliding speed to extend the drying time. As the granules slide down, due to the bending of the spiral pipe 3 and the centrifugal force, they slide close to the inner wall, while simultaneously undergoing a revolution around the central axis and their own rotation under the guidance of the shallow spiral guide lines 7 on the inner wall. This combined motion allows the granules to fully disperse, improves the uniformity of heating, and avoids the breakage problem caused by traditional throwing methods for wet granules.

[0032] Hot air is generated by heater 15 at the bottom of drying tower 1 and rises vertically to the center of spiral pipe 3 through hot air delivery pipe 8. The hot air is distributed to each spiral section 5 via distribution pipe 9, and a mesh screen 10 prevents particles from entering the distribution pipe 9 and clogging the hot air passage. The hot air penetrates the descending particle layer, achieving sufficient heat convection exchange and evaporating moisture. Simultaneously, heating resistance wire 6 on the inner wall of drying tower 1 heats the insulated inner cavity 2 and conducts heat to the wall of spiral pipe 3, providing direct heat conduction heating. A non-stick coating on the inner wall of the pipe prevents particle adhesion. This combined heating mode of heat convection and heat conduction transfers heat from both inside and outside the particles simultaneously, ensuring efficient drying speed and uniformity, especially suitable for particles made of fragile materials.

[0033] The evaporated moisture is discharged through the water vapor evaporation port 12 on the top wall of the spiral pipe 3, and finally collects and is discharged externally through the exhaust pipe 13 at the top of the drying tower body 1. After the fully dried particles reach the bottom of the spiral pipe 3, they are discharged through the discharge device 14 to enter the next process. Throughout the process, the heat-insulated inner cavity 2 formed by the drying tower body 1 maintains a uniform temperature distribution and prevents heat loss. The spiral pipe 3 consists of multiple independent spiral sections 5 connected by tee quick-connect flanges 4, which facilitates segmented maintenance. In case of rare material bridging or adhesion, the reserved vibrator can be activated to assist in clearing blockages and ensure continuous material flow.

[0034] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0035] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention.

Claims

1. An organic fertilizer granule drying device, comprising a drying tower (1), characterized in that, The drying tower body (1) has a hollow structure inside, forming an insulated inner cavity (2); the insulated inner cavity (2) is provided with a spiral pipe (3) that spirals down around the central axis of the drying tower body (1). The diameter of the spiral pipe (3) gradually increases from top to bottom and the adjacent pitches are equal, so that the spiral angle gradually decreases from top to bottom; the spiral pipe (3) is composed of multiple independent spiral segments (5) connected at the ends by a three-way quick-connect flange (4); shallow spiral guide lines (7) are opened on the inner wall of the spiral pipe (3); a vertical hot air conveying pipe (8) is provided at the central axis of the spiral pipe (3), and the hot air conveying pipe (8) is connected to the three-way quick-connect flange (4) through a distribution pipe (9); a water vapor evaporation port (12) is opened on the top wall of each tooth of the spiral pipe (3).

2. The organic fertilizer granule drying device according to claim 1, characterized in that, A mesh (10) is provided at the connection between the distribution pipe (9) and the spiral pipe (3).

3. The organic fertilizer granule drying device according to claim 2, characterized in that, The top of the spiral pipe (3) extends out of the drying tower body (1) and connects to the particle feed hopper (11), while the bottom is connected to the discharge pipe (14).

4. The organic fertilizer granule drying device according to claim 3, characterized in that, Heating resistance wires (6) are embedded in the inner wall of the drying tower body (1).

5. An organic fertilizer granule drying device according to claim 4, characterized in that, The shallow spiral guide pattern (7) extends continuously along the inner wall of the spiral pipe (3) in the circumferential direction, and the pattern depth is 0.5-2mm.

6. The organic fertilizer granule drying device according to claim 5, characterized in that, The drying tower body (1) has a frustum-shaped structure that is narrow at the top and wide at the bottom.

7. The organic fertilizer granule drying device according to claim 6, characterized in that, The inner wall of the spiral pipe (3) is coated with a non-stick coating.

8. The organic fertilizer granule drying device according to claim 7, characterized in that, The top of the drying tower body (1) is provided with an exhaust pipe (13).

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