A blower drying device

Abstract

This utility model relates to the technical field of chemical material drying equipment, specifically a forced-air drying device. It includes a drying chamber, a blower mechanism, and a multi-layer porous distribution plate. The blower mechanism includes a heater, a blower, a main pipe, and branch pipe assemblies. The main pipe is vertically installed on the side wall of the drying chamber. The branch pipe assemblies have multiple layers, and each branch pipe assembly corresponds to one of the porous distribution plates, with the corresponding branch pipe assemblies positioned below the porous distribution plates. Each branch pipe assembly includes multiple branch pipes connected to the main pipe, and the upper surface of each branch pipe has several air blowing holes facing the porous distribution plate. This application utilizes the three-dimensional cooperation of the multi-layer porous distribution plate and the branch pipe assemblies to deliver hot air layer by layer through the main pipe to each branch pipe assembly. The air blowing holes form a uniform upward airflow field covering the fluidized area. Combined with the dynamic crushing action of the stirring mechanism, this improves the uniformity of material heating and suppresses caking, resulting in high drying efficiency and stable product purity.

Description

Technical Field

[0001] This utility model relates to the technical field of chemical material drying equipment, specifically a blower drying device. Background Technology

[0002] Ethylene sulfate (DTD), as an additive in lithium-ion battery electrolytes, faces two major technical challenges in its drying process: First, traditional blower-type drying equipment uses a single-layer hot air distribution structure, which easily creates an uneven flow field within the drying chamber, leading to uneven heating of the material. This results in incomplete drying of some products, leaving residual solvent and moisture, severely affecting product purity. Second, powdered materials tend to accumulate on the drying chamber walls due to electrostatic adsorption, and localized overheating areas can cause the material to melt and clump, significantly reducing its flowability and subsequent processing performance. Existing drying equipment often employs simple mechanical stirring or single temperature control methods, which cannot achieve uniform hot air distribution in three-dimensional space or effectively solve the material clumping problem, making it difficult to balance drying efficiency and product quality. Especially when processing high-value-added fine chemical products, traditional equipment exhibits technical deficiencies such as high energy consumption and inaccurate determination of the drying endpoint.

[0003] Therefore, there is an urgent need to develop a new type of blower drying device to solve the above-mentioned technical problems. Utility Model Content

[0004] To address the problems mentioned above, this utility model provides a blower drying device that achieves three-dimensional uniform distribution of hot air through a combination of multi-layer porous distribution plates and a blower mechanism, effectively improving the uniformity and efficiency of drying, while avoiding material residue and caking.

[0005] The present invention adopts the following technical solution:

[0006] A forced-air drying device includes a drying chamber, a forced-air mechanism, and a porous distribution plate, wherein:

[0007] The porous distribution plate is arranged in multiple layers with intervals between them in the drying chamber;

[0008] The blowing mechanism includes a heater and a blower installed outside the drying chamber, and a main pipe and branch pipe assembly installed inside the drying chamber. The main pipe is vertically installed on the side wall of the drying chamber, and the branch pipe assembly is arranged in multiple layers on the main pipe with vertical spacing. The branch pipe assembly is arranged one-to-one with the perforated distribution plate, and the corresponding branch pipe assembly is located below the perforated distribution plate. The branch pipe assembly includes multiple branch pipes connected to the main pipe, and the upper surface of the branch pipes has several air blowing holes facing the perforated distribution plate.

[0009] The blower's air inlet is connected to the heater's air outlet, the blower's air outlet is connected to the main duct's air inlet, and the main duct's air outlet is connected to the multi-layer branch duct group.

[0010] Furthermore, the porous distribution plate has through holes that run vertically through it evenly on its surface, and the drying chamber has a feed inlet at the top.

[0011] Furthermore, it also includes a stirring mechanism, which includes a stirring shaft vertically arranged in the center of the drying chamber, stirring blades arranged on the stirring shaft, and a motor that drives the stirring shaft to rotate.

[0012] The porous distribution plate divides the drying chamber into multiple fluidization zones, and each fluidization zone is equipped with at least one stirring blade.

[0013] Furthermore, an air outlet is provided at the top of the drying chamber, and the air outlet is connected to the air inlet of the heater through a return air duct.

[0014] Furthermore, a humidity sensor is installed at the air outlet, and the humidity sensor is connected in communication with the heater and the blower.

[0015] Furthermore, the humidity sensor is a capacitive sensor.

[0016] Furthermore, an inclined discharge chute is provided at the bottom of the drying chamber, extending to the outside of the drying chamber, and a vibration motor is connected to the inclined discharge chute.

[0017] Furthermore, the perforated distribution plate is made of stainless steel, and the perforation rate of the plate surface is 18%-25%.

[0018] Furthermore, the porous distribution plate is set at an angle.

[0019] Furthermore, the edges of the stirring blades have a serrated structure.

[0020] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0021] The blower drying device provided in this application, through the three-dimensional cooperation of multiple layers of porous distribution plates and branch pipe groups, allows hot air to be transported layer by layer through the main pipe to each branch pipe group. The air blowing holes form a uniform upward airflow field covering the corresponding distribution plate area. Combined with the dynamic crushing effect of the stirring mechanism in the fluidization area, the uniformity of material heating is improved and the caking phenomenon is suppressed. It has the advantages of high drying efficiency and stable product purity. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0023] Figure 1 This is a schematic diagram of the structure of a blower drying apparatus provided in one embodiment of this application;

[0024] Figure 2 A schematic diagram showing the distribution of the porous distribution plate and branch pipe assembly of a blower drying device provided in an embodiment of this application;

[0025] Wherein: 1-drying chamber, 2-blowing mechanism, 21-heater, 22-blowing fan, 23-main pipe, 24-branch pipe, 241-first branch pipe, 242-second branch pipe, 3-perforated distribution plate, 4-stirring mechanism, 41-stirring shaft, 42-stirring blade, 43-motor, 5-return air pipe, 6-inclined discharge chute, 7-vibrating motor. Detailed Implementation

[0026] The technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0027] The following is in conjunction with the appendix Figure 1 To be continued Figure 2 The present invention will be described in detail with specific embodiments.

[0028] See Figure 1 and Figure 2 This utility model provides a blower drying device, including a drying chamber 1, a blower mechanism 2, and a porous distribution plate 3, wherein: the porous distribution plate 3 has multiple layers arranged at intervals in the drying chamber 1;

[0029] The blower mechanism 2 includes a heater 21 and a blower 22 disposed outside the drying chamber 1, and a main pipe 23 and a branch pipe assembly disposed inside the drying chamber 1. The main pipe 23 is vertically disposed on the side wall of the drying chamber 1. The branch pipe assembly is arranged in multiple layers on the main pipe 23 at intervals. The branch pipe assembly is arranged one-to-one with the perforated distribution plate 3, and the corresponding branch pipe assembly is disposed below the perforated distribution plate 3. The branch pipe assembly includes multiple branch pipes 24 connected to the main pipe 23. The upper surface of the branch pipe 24 has several air blowing holes that blow towards the perforated distribution plate 3. The air inlet of the blower 22 is connected to the air outlet of the heater 21, the air outlet of the blower 22 is connected to the air inlet of the main pipe 23, and the air outlet of the main pipe 23 is connected to the multi-layer branch pipe assembly.

[0030] In this application, the porous distribution plate 3 refers to a support plate with several openings, which allows hot air to penetrate the material layer evenly and dry the material on the porous distribution plate 3. The branch pipe group refers to multiple branch pipes 24 connected to the main pipe, which can be implemented using metal pipes. The air holes on the upper surface of the branch pipes 24 form a vertically upward airflow channel, ensuring that the hot air directly acts on the bottom of the material layer after passing through the porous distribution plate 3.

[0031] Specifically, the drying chamber 1 is divided into multiple independent drying zones by a porous distribution plate 3. Hot air is heated by the heater 21 and then forced into the main pipe 23 by the blower 22, and distributed to the corresponding drying zones through the branch pipe groups. The air blowing holes on the branch pipes 24 generate a uniform upward airflow that penetrates the porous distribution plate 3 and dries the material on it. This structure achieves uniform drying of vinyl sulfate powder and completely removes residual solvent and moisture.

[0032] Furthermore, the porous distribution plate 3 has uniformly distributed through holes running vertically, and a feed inlet is located at the top of the drying chamber 1. The mesh structure formed by the uniformly distributed through holes establishes multiple parallel airflow channels in the vertical direction. When hot air flows upward from the bottom branch pipe assembly, the airflow is forcibly dispersed into uniformly distributed micro-airflow jets. This structure ensures that the material is continuously subjected to uniform airflow impact during the drying process, eliminating the drying blind spots caused by uneven airflow distribution in traditional equipment. At the same time, the porous distribution plate 3 structure allows airflow to penetrate in both directions while bearing the material, accelerating the drying of the surface material and preventing electrostatic adsorption of powder through airflow disturbance.

[0033] Furthermore, it also includes a stirring mechanism 4, which includes a stirring shaft 41 vertically arranged in the center of the drying chamber 1, stirring blades 42 arranged on the stirring shaft 41, and a motor 43 that drives the stirring shaft 41 to rotate; the porous distribution plate 3 divides the drying chamber 1 into multiple fluidized zones, and the fluidized zone refers to an independent space formed by the separation of multiple layers of porous distribution plate 3, and at least one stirring blade 42 is provided in each fluidized zone.

[0034] Specifically, the stirring shaft 41, driven by the motor 43, rotates the stirring blades 42, thereby agitating and breaking up agglomerated materials. More specifically, the porous distribution plate 3 divides the drying chamber 1 into several fluidized zones. Within each fluidized zone, the stirring blades 42 continuously apply shear force to the material during rotation, breaking up the chain-like structure of particles formed by electrostatic adsorption. When hot air penetrates the porous distribution plate 3 upwards from the air vents of the branch pipe 24, the material is suspended and dispersed under the influence of the airflow. By configuring at least one stirring blade 42 in each fluidized zone, the material is mechanically agitated layer by layer in the vertical direction, avoiding the material accumulation problem at the bottom caused by traditional single-layer agitation.

[0035] See Figure 1 , Figure 2 In some embodiments, the branch pipe group includes a first branch pipe 241 connected to the main pipe 23 and a plurality of second branch pipes 242 distributed on the first branch pipe 241. The hot air in the main pipe 23 first enters the first branch pipe 241, and then enters the plurality of second branch pipes 242, thereby achieving the dispersion of hot air in the fluidization zone. It should be noted that interference with the stirring shaft 41 and the stirring blades 42 should be avoided when designing the main pipe 23 and the branch pipe group.

[0036] This application overcomes the limitations of traditional blower drying by combining fluidization and stirring through a synergistic design. The combination of multi-layer porous distribution plate 3 and stirring mechanism 4 ensures that hot air penetrates the material evenly and prevents caking through mechanical stirring.

[0037] Furthermore, an air outlet is provided at the top of the drying chamber 1, which is connected to the air inlet of the heater 21 via a return air duct 5. Specifically, the hot and humid air generated during the drying process is discharged from the top air outlet and then transported to the air inlet of the heater 21 via the return air duct 5, where it is mixed with the fresh air supplied from the outside and reheated. The residual heat carried by the circulating airflow reduces the energy consumption of the heater 21 for heating the fresh air, while maintaining a stable temperature field within the drying chamber 1. The forced circulation airflow path avoids excessively high local humidity, making the evaporation rate of moisture on the material surface more uniform, thereby improving drying uniformity. Preferably, the heater 21 has a power of 15kW, which can accurately control the air temperature within the range of 80-100°C, and the blower 22 has a blower airflow of 2000m³ / h. After passing through the multi-layer distribution plate 3, the air velocity of the hot air is uniformly and stably maintained at 0.8-1.2m / s. Through the above closed-loop circulation design, the thermal efficiency is increased to 88%, saving more than 25% energy compared to the traditional open drying system.

[0038] Furthermore, a humidity sensor is installed at the air outlet, and the humidity sensor is communicatively connected to the heater 21 and the blower 22. The humidity sensor is a device used to detect the moisture content in the gas; specifically, a capacitive sensor can be used, which reflects humidity data by measuring changes in the dielectric constant. This sensor, located at the air outlet, can directly capture the humidity information of the gas discharged from the drying chamber, thereby accurately determining the degree of material dryness. Specifically, the humidity of the gas discharged during the drying process is continuously monitored by the humidity sensor. When the detected humidity is higher than a set threshold, it indicates that residual solvent or moisture in the material has not been completely removed. At this time, the heater 21 automatically increases the heating power to increase the hot air temperature, while the blower 22 increases the airflow to accelerate the removal of moisture. When the humidity is lower than the threshold, the heater 21 lowers the temperature, and the blower 22 reduces the airflow to avoid over-drying, which could lead to electrostatic adsorption or localized overheating on the material surface. By dynamically adjusting the hot air temperature and airflow intensity, both thorough drying is ensured, and material caking caused by continuous high temperatures is prevented.

[0039] Furthermore, the humidity sensor is a capacitive sensor, which can reflect the gas humidity in real time through changes in the dielectric constant. The accuracy of the capacitive sensor is ±0.3%RH. When the detected humidity value exceeds the set threshold (e.g., 0.5%RH), the central control system automatically increases the speed of blower 22 by 10%-15% through a PID algorithm, while simultaneously increasing the power of heater 21 by 5%-8%. Experimental verification shows that this system can stably control the final moisture content of the material below 0.03% (industry standard is ≤0.05%), and the batch-to-batch moisture content fluctuation range is only ±0.01%, significantly better than the ±0.05% fluctuation of traditional manual control.

[0040] Furthermore, an inclined discharge chute 6 is provided at the bottom of the drying chamber 1, extending to the outside of the drying chamber 1. A vibration motor 7 is connected to the inclined discharge chute 6. The inclined discharge chute 6 is a material guiding structure with a downward inclination angle connected to the bottom of the drying chamber 1. Specifically, it can be formed by welding stainless steel, and its inclination angle can be controlled, for example, between 10 degrees and 30 degrees. This structure uses gravity to cause the material to move outward along the inclined surface, preventing the material from accumulating on the bottom plane. The vibration motor 7 transmits mechanical vibration to the inclined discharge chute 6, causing the material to be continuously dispersed during movement and enter the external collection container.

[0041] Preferably, the surface of the inclined discharge chute 6 is coated with a polytetrafluoroethylene coating, which can reduce the material friction coefficient to below 0.1, achieve 100% smooth discharge, and eliminate material retention.

[0042] Furthermore, the porous distribution plate 3 is made of stainless steel, and its surface porosity is 18%-25%. Specifically, the choice of stainless steel ensures the stability of the porous distribution plate 3 in a dry environment containing solvents, avoiding the pore deformation caused by corrosion or softening of traditional carbon steel or plastic materials, thus guaranteeing the long-term effectiveness of the airflow channel. The porosity is controlled within the range of 18%-25%. Experimental verification shows that this value can balance airflow resistance and distribution uniformity, improving the uniformity of hot air to over 92% (compared to only 75% for traditional single-layer distribution plates), ensuring the stability of the material fluidization state. Through the synergistic effect of material and porosity, this application ensures that hot air is uniformly dispersed into the material layer, avoiding solvent residue and caking problems caused by localized overheating or dead airflow zones.

[0043] Furthermore, the porous distribution plate 3 is inclined at an angle of 8°-15°, preferably 10°. When material accumulates on the inclined plate surface, the component of gravity causes the material to slide along the inclined direction. At this time, the hot air blown out by the bottom branch pipe group acts on the material through the air blowing holes. The sliding motion and airflow disturbance together form a dynamic fluidization effect. The inclined plate surface changes the contact direction between the hot air and the material from perpendicular to inclined, extending the penetration path of the airflow in the material layer and enhancing the heat exchange effect. At the same time, the inclined angle design of the porous distribution plate 3, combined with the vibration motor 7 at the bottom, increases the transfer efficiency of the material in the fluidization area by more than 40%, and shortens the drying time to 30-45 minutes.

[0044] Furthermore, the edges of the stirring blades 42 have a serrated structure. When the stirring shaft 41 drives the serrated blades to rotate, the sharp teeth preferentially cut into the material layer, forming a localized high-intensity shear zone. The intermittent contact of the serrated edges causes the material to be subjected to alternating compression and release in the axial and radial directions, promoting the dispersion of electrostatically adsorbed powder particles. Experimental verification shows that the serrated structure of the edges can increase the material agglomeration breakup rate to over 95%. Under the same drying conditions, the material caking rate using this device is only 0.8%, and the average particle size distribution of the material is more concentrated.

[0045] The working principle of this utility model's blower drying device is as follows:

[0046] The vinyl sulfate powder to be dried is added through the top feed inlet of drying chamber 1 and falls into the multi-layer fluidized zone. Hot air flows evenly upward through the porous distribution plate 3, fluidizing the material, increasing the contact area between the hot air and the material, and accelerating moisture evaporation. The stirring mechanism 4 starts simultaneously, breaking up material agglomerates to prevent caking and pushing the material down layer by layer between the fluidized zones, extending the drying time. The vibrating motor 7 continuously vibrates at the bottom of drying chamber 1, ensuring rapid discharge of the dried material and preventing localized accumulation. The humidity monitoring system dynamically adjusts the hot air parameters based on real-time humidity data to ensure thorough drying and optimized energy consumption.

[0047] The performance verification experiment results of drying vinyl sulfate (DTD) using the above-mentioned drying device are as follows:

[0048] Drying efficiency: Under the condition of processing capacity of 500kg / h, the moisture content of the material can be reduced from 8% to 0.03% in only 35 minutes, which is 45% shorter than traditional equipment.

[0049] Material quality: The angle of repose of the dried material is 32° (excellent flowability), while the angle of repose of the material after treatment by traditional equipment is 40°-45°; XRD test shows that the material processed by this device has a complete crystal structure and no thermal degradation.

[0050] Energy consumption indicators: Energy consumption per ton of product is reduced by 28% compared with traditional processes, and annual operating costs are reduced by approximately RMB 100,000 (based on an annual processing capacity of 2,000 tons).

[0051] As can be seen from the above data, this device, through the synergistic effect of fluidized drying, dynamic stirring, and intelligent control, has achieved industry-leading levels in drying efficiency, material quality, and energy consumption control, demonstrating significant technological innovation value and economic practicality.

[0052] The present invention has been further described above with reference to specific embodiments. However, it should be understood that the specific description herein should not be construed as limiting the substance and scope of the present invention. Various modifications made by those skilled in the art to the above embodiments after reading this specification are all within the scope of protection of the present invention.

Claims

1. A blast drying apparatus, characterized by, Includes a drying chamber, a blower mechanism, and a porous distribution plate, wherein: The porous distribution plate is arranged in multiple layers with vertical spacing inside the drying chamber; The blowing mechanism includes a heater and a blower disposed outside the drying chamber, and a main pipe and a branch pipe assembly disposed inside the drying chamber. The main pipe is vertically disposed on the side wall of the drying chamber. The branch pipe assembly is arranged in multiple layers on the main pipe with vertical spacing. The branch pipe assembly is disposed one-to-one with the porous distribution plate, and the corresponding branch pipe assembly is disposed below the porous distribution plate. The branch pipe assembly includes multiple branch pipes communicating with the main pipe, and the upper surface of the branch pipes has a number of air blowing holes facing the porous distribution plate. The air inlet of the blower is connected to the air outlet of the heater, the air outlet of the blower is connected to the air inlet of the main pipe, and the air outlet of the main pipe is connected to the multi-layer branch pipe group.

2. The air blast drying apparatus of claim 1, wherein The porous distribution plate has through holes that run vertically through it evenly on its surface, and the drying chamber has a feed inlet at the top.

3. The air blast drying apparatus of claim 1, wherein It also includes a stirring mechanism, which includes a stirring shaft vertically arranged in the center of the drying chamber, stirring blades arranged on the stirring shaft, and a motor that drives the stirring shaft to rotate; The porous distribution plate divides the drying chamber into multiple fluidization zones, and each fluidization zone is provided with at least one stirring blade.

4. The air blast drying apparatus of claim 1, wherein An air outlet is provided at the top of the drying chamber, and the air outlet is connected to the air inlet of the heater through a return air duct.

5. The air blast drying apparatus of claim 4, wherein A humidity sensor is installed at the air outlet, and the humidity sensor is communicatively connected to the heater and the blower.

6. The air blast drying apparatus of claim 5, wherein The humidity sensor is a capacitive sensor.

7. The air blast drying apparatus of claim 1, wherein An inclined discharge chute is provided at the bottom of the drying chamber, and the inclined discharge chute extends to the outside of the drying chamber. A vibration motor is connected to the inclined discharge chute.

8. The air blast drying apparatus of claim 2, wherein The porous distribution plate is made of stainless steel, and the perforation rate of the plate surface is 18%-25%.

9. The air blast drying apparatus of claim 2, wherein The porous distribution plate is set at an angle.

10. The air blast drying apparatus of claim 3, wherein The edges of the stirring blades have a serrated structure.

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