A wet particle fluidization characterization apparatus and method for precise control of humidity

Abstract

This invention belongs to the technical field of fluidization characteristics research for particles in fluidized beds, and discloses a device and method for precisely controlling humidity in wet particle fluidization characteristics research. The device includes a blower mechanism, an air path structure, a fluidized bed, a humidification mechanism, a flow detection component, a flow control component, a data acquisition component, and a control mechanism. The air path structure divides the compressed air generated by the blower mechanism into two paths. One path is humidified by the humidification mechanism, and the two gas paths are mixed into one path before entering the fluidized bed. The flow detection component acquires the flow rates of the two gas paths, the data acquisition component acquires temperature, humidity, and pressure difference data within the fluidized bed, and the control mechanism adjusts the opening of the flow control component using positive feedback based on the data acquired by the data acquisition component to control the mixing ratio of the two gas paths. This invention achieves precise humidity control within the fluidized bed through positive feedback adjustment, enabling quantitative research on the impact of humidity on particle fluidization characteristics.

Description

Technical Field

[0001] This invention belongs to the field of research on the fluidization characteristics of particles in a fluidized bed, and particularly relates to a device and method for studying the fluidization characteristics of wet particles with precise humidity control. Background Technology

[0002] Gas-solid fluidization processes are widely used in chemical, pharmaceutical, food, energy, and materials synthesis industries due to their excellent heat and mass transfer and particle mixing properties. Applications include particle drying, granulation, drug coating, and catalytic reactions. In these actual industrial production processes, particle systems are often not completely dry. Due to process requirements or environmental factors, moisture or a liquid phase often adheres to the particle surface, forming wet particles. Compared to dry particle systems, wet particles exhibit strong interparticle adhesion due to liquid bridging forces. This adhesion introduced by the liquid phase significantly alters the fluid dynamics of the particles, leading to a deterioration in fluidization quality.

[0003] During the fluidization process of wet particles, agglomeration is highly likely to occur, leading to channeling, localized clumping, and slugging within the fluidized bed, and even defluidization of the entire bed. This not only reduces production efficiency but also causes unstable product quality, and in severe cases, can even lead to production accidents. Accurate control of the fluidizing gas and the humidity within the system is a crucial prerequisite for studying the fluidization characteristics of wet particles. However, existing studies on the fluidization characteristics of wet particles mainly obtain wet particles by directly adding liquid dropwise. This method often results in uneven humidity distribution, and as the experiment progresses, the liquid is carried away by the gas, making it difficult to quantitatively investigate the impact of trace moisture changes on fluidization characteristics. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for studying the fluidization characteristics of wet particles with precise humidity control, so as to solve the above-mentioned problems.

[0005] To achieve the above objectives, the present invention provides the following solution: An apparatus for studying the fluidization characteristics of wet particles with precise humidity control, comprising: Blower mechanism; The air passage structure has an air inlet end connected to the blower mechanism, and the air passage structure is used to divide the compressed air generated by the blower mechanism into two paths. The fluidized bed is connected to the outlet of the gas path structure through a gas pre-distribution chamber, and the two compressed air streams are mixed into one stream before entering the gas pre-distribution chamber. A humidification mechanism is installed on the air passage structure, and the humidification mechanism is used to humidify one of the compressed air passages; A flow detection component is installed on the air path structure to obtain the flow rates of the two compressed air streams respectively; A flow control component is provided on the air passage structure to control the flow rates of the two compressed air paths respectively; A data acquisition component is installed on the fluidized bed to acquire temperature, humidity, and pressure difference data within the fluidized bed. The control mechanism is electrically connected to the flow detection component, the data acquisition component, and the flow control component, respectively. The control mechanism is used to adjust the opening of the flow control component in a positive feedback manner based on the data collected by the data acquisition component, so as to control the mixing ratio of the two compressed air streams.

[0006] The blower mechanism generates compressed air, which is then split into two streams via the air path structure. One stream is humidified by a humidification unit. The two streams of compressed air are mixed together before entering the gas pre-distribution chamber, where they then enter the fluidized bed to fluidize the particles. A flow detection component acquires the flow rates of both streams and sends them to the control mechanism. A data acquisition component acquires real-time temperature, humidity, and differential pressure data within the fluidized bed and sends this data to the control mechanism as well. Based on the data acquired by the data acquisition component, the control mechanism adjusts the opening of the flow control component using a positive feedback mechanism to control the mixing ratio of the two streams of compressed air.

[0007] This method enables precise closed-loop control of humidity within a fluidized bed, avoiding the uneven humidity distribution caused by traditional liquid droplet addition. It allows for quantitative control of humidity changes, providing precise humidity conditions for the study of wet particle fluidization characteristics.

[0008] Preferably, the gas pre-distribution chamber is located at the bottom of the fluidized bed and is connected to the fluidized bed through a distribution plate, and the bottom end of the gas pre-distribution chamber is connected to the gas outlet end of the gas path structure; a plurality of spheres for dispersing gas are placed in the gas pre-distribution chamber.

[0009] After the two compressed air streams are mixed, they enter the bottom of the gas pre-distribution chamber. The mixed gas is then evenly dispersed after passing through multiple spheres placed in the pre-distribution chamber to disperse the gas, and then enters the bottom of the fluidized bed through the distribution plate.

[0010] By dispersing the mixed gas with spheres, the gas distribution entering the fluidized bed becomes more uniform, avoiding excessively high or low local humidity and ensuring consistent particle fluidization conditions within the bed.

[0011] Preferably, the humidification mechanism includes a bubbler, wherein compressed air enters the inlet of the bubbler and enters the gas pre-distribution chamber through the outlet of the bubbler.

[0012] One stream of compressed air enters the inlet of the bubbler, where it comes into contact with the liquid and gains humidity. The humidified compressed air is then discharged from the outlet of the bubbler and mixed with another stream of dry compressed air before entering the gas pre-distribution chamber.

[0013] Humidifying compressed air by bubbling provides a stable source of humidified air, avoiding uneven humidity and liquid carryover issues caused by directly adding liquid.

[0014] Preferably, the bubbler is provided with a temperature control box for controlling the temperature inside the bubbler.

[0015] The temperature control box detects and controls the temperature inside the bubbler, keeping the liquid and gas temperatures within the set range.

[0016] To avoid liquid condensation after the mixed gas enters the fluidized bed due to temperature changes, and to ensure the humidity stability of the humid air, the accuracy of humidity control during the experiment must be guaranteed.

[0017] Preferably, the control mechanism includes a control system, which is electrically connected to a data acquisition control box, and the data acquisition control box is electrically connected to the flow detection component, the data acquisition component, and the flow control component.

[0018] The control system sends commands to the data acquisition control box, which then interacts with the flow detection component, data acquisition component, and flow control component to transmit commands and achieve centralized control and data acquisition of each component.

[0019] The data acquisition and control box enables centralized management and coordinated control of multiple components, improving system integration and response speed, and providing a hardware foundation for positive feedback regulation.

[0020] Preferably, the flow detection component includes a first flow meter and a second flow meter, which are used to detect the flow rates of the two compressed air streams, respectively. Both the first flow meter and the second flow meter are electrically connected to the data acquisition and control box.

[0021] The first and second flow meters respectively detect the real-time flow rates of the two compressed air streams and send the flow data to the data acquisition and control box.

[0022] Real-time acquisition of flow data from both gas streams provides precise feedback parameters for the control mechanism to calculate the mixing ratio and adjust the flow control components.

[0023] Preferably, the flow control component includes a first flow valve and a second flow valve, which are used to control the flow rates of the two compressed gas streams, and both the first flow valve and the second flow valve are electrically connected to the data acquisition and control box.

[0024] The data acquisition and control box sends opening adjustment signals to the first and second flow valves according to the instructions of the control system, thereby controlling the flow rate of the two compressed gas streams respectively.

[0025] It enables independent and precise adjustment of the flow rates of the two gases, thereby accurately controlling the mixing ratio of dry and wet gases to achieve the preset humidity value.

[0026] Preferably, the data acquisition component includes a pressure sensor and a temperature and humidity sensor disposed on the fluidized bed, and both the pressure sensor and the temperature and humidity sensor are electrically connected to the data acquisition and control box.

[0027] Pressure sensors installed on the fluidized bed collect pressure change data within the fluidized bed, while temperature and humidity sensors collect temperature and humidity data within the fluidized bed. Both sensors transmit the collected data to the data acquisition and control box in real time.

[0028] Real-time monitoring of temperature, humidity, and pressure differences within the fluidized bed provides a basis for positive feedback regulation of the control mechanism and data support for fluidization characteristic analysis.

[0029] Preferably, a high-speed camera and a light source are provided on one side of the fluidized bed, with the shooting end of the high-speed camera facing the fluidized bed and the illumination end of the light source facing the fluidized bed. The high-speed camera is electrically connected to the data acquisition and control box.

[0030] The light source provides illumination to the fluidized bed, and the high-speed camera's camera end is pointed towards the fluidized bed to capture the particle movement process at a high frequency. The acquired image data is sent to the data acquisition and control box.

[0031] Images of the motion characteristics of particles in a fluidized bed are obtained for subsequent image processing and analysis to obtain particle fluidization characteristic curves and particle flow characteristics.

[0032] A method for using the aforementioned apparatus for precisely controlling the fluidization characteristics of wet particles includes the following steps: The blower generates compressed air, and the air path structure divides the compressed air into two paths and humidifies one of them. After the two compressed air paths are mixed, they enter the fluidized bed through the gas pre-distribution chamber to fluidize the particles in the initial bed layer. The data acquisition component acquires temperature, humidity, and differential pressure data within the fluidized bed and sends them to the control mechanism. Based on the data acquired by the data acquisition component, the control mechanism adjusts the opening of the flow control component in a positive feedback manner to control the mixing ratio of the two compressed air streams, so that the humidity within the fluidized bed reaches a preset value. Pressure change data and fluidization characteristic images were collected in the fluidized bed during the experiment to obtain particle fluidization and counter-fluidization curves and particle flow characteristics.

[0033] The blower generates compressed air, which is then split into two streams within the air path structure. One stream is humidified by a humidifier and mixed with the other stream before entering the gas pre-distribution chamber. The air then flows into the fluidized bed to fluidize the particles in the initial bed layer. A data acquisition component acquires temperature, humidity, and pressure difference data within the fluidized bed and sends them to the control mechanism. Based on the collected data, the control mechanism adjusts the opening of the flow control component using positive feedback to control the mixing ratio of the two streams of compressed air, ensuring the humidity within the fluidized bed reaches a preset value. Pressure change data and fluidization characteristic images are collected during the experiment, and post-processing yields particle fluidization curves, counter-fluidization curves, and particle flow characteristics.

[0034] The entire experimental process, from gas generation, humidity control, fluidization process to data acquisition and processing, has been fully realized. It can systematically obtain particle fluidization characteristic data under different humidity conditions, which can be used to compare the differences in fluidization characteristics between dry and wet particles, and provide a theoretical basis for the fluidization of wet viscous particles in industrial processes.

[0035] Compared with the prior art, the present invention has the following advantages and technical effects: This invention uses a control mechanism to adjust the opening of the flow control component based on temperature and humidity data collected by the data acquisition component, precisely controlling the mixing ratio of the two compressed air streams. This avoids the uneven humidity distribution problem caused by directly adding liquid. Furthermore, since the gas humidification process is completed outside the fluidized bed, the liquid is not carried out by the gas during the experiment, enabling quantitative control of trace moisture changes. Multiple spheres in the gas pre-distribution chamber disperse the mixed gas, ensuring uniform gas distribution into the fluidized bed and preventing localized humidity differences from interfering with the study of fluidization characteristics. Attached Figure Description

[0036] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort: Figure 1 This is a schematic diagram of the structure of the present invention; Figure 2 The graph shows the pressure drop versus flow rate in the fluidized bed at relative humidity of 0%, 0.2%, 0.4%, and 0.8%. Figure 3 The graph shows the particle motion characteristics in a fluidized bed at relative humidity levels of 0%, 0.2%, 0.4%, and 0.8%. The components include: 1. Fan; 2. First flow valve; 3. Second flow valve; 4. First flow meter; 5. Second flow meter; 6. Bubble blower; 7. Temperature control box; 8. Gas pre-distribution chamber; 9. Fluidized bed; 10. Particles in the initial bed layer; 11. Pressure sensor; 12. Temperature and humidity sensor; 13. Data acquisition and control box; 14. High-speed camera; 15. Light source; 16. Control system. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Reference Figure 1 This invention discloses a device for studying the fluidization characteristics of wet particles for precise humidity control, comprising: Blowering mechanism; the blowering mechanism is blower 1, including a Roots pump blower; The air passage structure has an air inlet end connected to the blower mechanism, and the air passage structure is used to divide the compressed air generated by the blower mechanism into two paths. The fluidized bed 9 is connected to the outlet of the gas path structure through the gas pre-distribution chamber 8, and the two compressed air streams are mixed into one stream before entering the gas pre-distribution chamber 8. The humidification mechanism is installed on the air path structure and is used to humidify one of the compressed air paths. A flow detection component, installed on the air path structure, is used to obtain the flow rates of the two compressed air streams respectively; The flow control component, located on the air path structure, is used to control the flow rate of the two compressed air paths separately. The data acquisition component is installed on the fluidized bed 9 and is used to acquire temperature, humidity and pressure difference data within the fluidized bed 9. The control mechanism is electrically connected to the flow detection component, the data acquisition component, and the flow control component, respectively. The control mechanism is used to adjust the opening of the flow control component in a positive feedback manner based on the data collected by the data acquisition component, so as to control the mixing ratio of the two compressed air streams.

[0040] In a further optimized design, the gas pre-distribution chamber 8 is located at the bottom of the fluidized bed 9 and is connected to the fluidized bed 9 through a distribution plate. The bottom end of the gas pre-distribution chamber 8 is connected to the gas outlet end of the gas path structure. Multiple spheres for dispersing gas are placed inside the gas pre-distribution chamber 8.

[0041] Spheres include glass spheres.

[0042] The scheme is further optimized. The humidification mechanism includes a bubbler 6, in which compressed air enters the air inlet of the bubbler 6 and enters the gas pre-distribution chamber 8 through the air outlet of the bubbler 6.

[0043] To further optimize the design, a temperature control box 7 is installed on the top of the bubbler 6 to control the temperature inside the bubbler 6.

[0044] The scheme is further optimized. The control mechanism includes a control system 16, which is electrically connected to a data acquisition control box 13. The data acquisition control box 13 is electrically connected to the flow detection component, the data acquisition component, and the flow control component.

[0045] The scheme is further optimized. The flow detection component includes a first flow meter 4 and a second flow meter 5. The first flow meter 4 and the second flow meter 5 are used to detect the flow rates of the two compressed air streams, respectively. Both the first flow meter 4 and the second flow meter 5 are electrically connected to the data acquisition and control box 13.

[0046] The scheme is further optimized. The flow control component includes a first flow valve 2 and a second flow valve 3. The first flow valve 2 and the second flow valve 3 are used to control the flow rates of the two compressed gas streams, respectively. Both the first flow valve 2 and the second flow valve 3 are electrically connected to the data acquisition and control box 13.

[0047] The scheme is further optimized. The data acquisition components include a pressure sensor 11 and a temperature and humidity sensor 12 installed on the fluidized bed 9. Both the pressure sensor 11 and the temperature and humidity sensor 12 are electrically connected to the data acquisition and control box 13.

[0048] To further optimize the design, a high-speed camera 14 and a light source 15 are installed on one side of the fluidized bed 9. The shooting end of the high-speed camera 14 faces the fluidized bed 9, and the lighting end of the light source 15 faces the fluidized bed 9. The high-speed camera 14 is electrically connected to the data acquisition and control box 13.

[0049] A method for using a device for studying the fluidization characteristics of wet particles for precise humidity control, comprising the following steps: The blower generates compressed air, and the air path structure divides the compressed air into two paths and humidifies one of them. After the two compressed air paths are mixed, they enter the fluidized bed 9 through the gas pre-distribution chamber 8 to fluidize the particles 10 in the initial bed layer. The data acquisition component acquires temperature, humidity, and differential pressure data within the fluidized bed 9 and sends them to the control mechanism. Based on the data acquired by the data acquisition component, the control mechanism adjusts the opening of the flow control component in a positive feedback manner to control the mixing ratio of the two compressed air streams, so that the humidity within the fluidized bed 9 reaches the preset value. Pressure change data and fluidization characteristic images were collected in fluidized bed 9 during the experiment to obtain particle fluidization and counter-fluidization curves and particle flow characteristics.

[0050] Experimental procedure: Compressed air enters two gas paths via fan 1. The gas flow rates in these two paths are regulated by first flow valve 2 and second flow valve 3, respectively, and recorded by first flow meter 4 and second flow meter 5. The humidified gas in the humidified gas path receives a certain level of humidity through bubbler 6 and is then fed into a gas pre-distribution chamber 8 located at the bottom of the fluidized bed. Glass beads are placed in the gas pre-distribution chamber 8 for uniform gas distribution, and it is connected to the fluidized bed 9 via a distribution plate. After passing through the distribution plate, the gas flows uniformly into the fluidized bed 9, fluidizing the initial bed particles 10 within the fluidized bed 9. Before the experiment begins, the initial bed particles 10 of the specific particle size or properties to be studied are uniformly filled at the bottom of the fluidized bed 9. After filling the initial bed particles 10, a light source 15 is placed behind the fluidized bed 9 for supplemental lighting, and a high-speed camera 14 is placed in front of the fluidized bed 9 and connected to the control system 16. The intensity of the light source 15 and the position of the high-speed camera 14 are adjusted so that the movement range of the initial bed particles 10 within the fluidized bed 9 precisely fills the frame of the high-speed camera 14. Under the influence of fluidizing gas, as the gas flow rate increases, the particles 10 in the initial bed layer gradually move within the fluidized bed 9. At a specific gas flow rate, once the flow stabilizes, a high-speed camera 14 captures images to ensure the particle flow characteristics are recorded. Simultaneously, a pressure sensor 11 collects pressure changes during the flow process. The data acquisition and control box 13 detects the temperature and humidity data at the top of the fluidized bed 9, providing positive feedback to the two gas paths. By adjusting the first flow valve 2 and the second flow valve 3 of the two gas paths, the gas mixing ratio is controlled, thereby precisely controlling the humidity during the experiment. Simultaneously, the temperature control box 7 controls the temperature inside the bubbler 6 to prevent liquid condensation due to temperature changes. The pressure change data collected under different gas flows and the captured fluidization characteristic images are post-processed to obtain particle fluidization and counter-fluidization curves and particle flow characteristics.

[0051] Dry particle fluidization process: Spherical particles with a diameter of 1.0 mm were selected for the dry particle fluidization experiment. The particles were ensured to be dry and uniformly filled at the bottom of the fluidized bed. Then, the high-speed camera 14 and light source 15 were turned on, and their intensity was adjusted so that the entire fluidized bed 9 was within the frame of the camera. Simultaneously, the image captured by the high-speed camera 14 was ensured to be sufficiently clear to guarantee the accuracy of subsequent image processing. Before turning on the blower 1, the second flow valve 3 was ensured to be closed to avoid affecting the experimental process. The blower 1 was turned on, and the first flow valve 2 was adjusted while observing the reading of the first flow meter 4. The gas flow rate was adjusted according to experimental needs. After each adjustment, the gas flow rate was read again after 30 seconds of stabilization of the first flow meter 4. To ensure the accuracy of the experimental results, multiple readings were taken and the average value was calculated. The gas flow rate is gradually increased through the first flow valve 2. At each gas flow rate, images are taken after the flow stabilizes to ensure that the high-speed camera 14 can capture the flow characteristics. Simultaneously, the pressure sensor 11 collects the pressure changes during the flow process to obtain the fluidization curve. After the gas flow rate reaches its maximum value, a counter-fluidization process is performed. The gas flow rate is gradually decreased through the first flow valve 2. At each gas flow rate, images are taken after the flow stabilizes to ensure that the high-speed camera 14 can capture the flow characteristics. Simultaneously, the pressure sensor 11 collects the pressure changes during the flow process to obtain the counter-fluidization curve. After the experiment, the fan 1 and the first flow valve 2 are turned off. After the particles are completely still, the high-speed camera 14 is turned off. The pressure change data and fluidization characteristic images collected at different gas flow rates are post-processed to obtain the dry particle fluidization curve and particle flow characteristics.

[0052] Wet particle fluidization process: Spherical particles with a diameter of 1.0 mm were selected for the wet particle fluidization experiment, and the particles were evenly filled at the bottom of the fluidized bed. Then, the high-speed camera 14 and light source 15 were turned on, and the intensity of the high-speed camera 14 and light source 15 was adjusted so that the entire fluidized bed was within the shooting frame. At the same time, the image captured by the high-speed camera was ensured to be clear enough to ensure the accuracy of subsequent image processing. The blower 1 was turned on, and the first flow valve 2 and the second flow valve 3 on the two gas lines were adjusted. The readings of the two first flow meters 4 and the second flow meter 5 were observed. According to the relative humidity requirements of the experiment, the gas flow rate of the two gas lines was adjusted until the relative humidity of the temperature and humidity sensor 12 at the top of the fluidized bed reached the required relative humidity. The entire gas line was ensured to operate stably for a period of time. After that, the gas flow rate of the first flow meter 4 and the second flow meter 5 was read. The flow rate ratio of the two gas lines was determined. To ensure the accuracy of the experimental results, multiple readings were taken and the average value was taken. The total gas volume was gradually increased through the first flow valve 2 and the second flow valve 3. At a specific gas volume, the data acquisition and control box 13 uses data from the temperature and humidity sensor 12 at the top of the fluidized bed to positively feedback-adjust the first flow valve 2, the second flow valve 3, and the temperature control box 7 to ensure the experimental humidity is at the set level. After the gas flow rate stabilizes, the fluidization process is filmed to ensure the high-speed camera 14 can capture the particle flow characteristics. Simultaneously, the pressure sensor 11 collects the pressure changes during the flow process to obtain the fluidization curve. After the gas volume reaches its maximum value, the gas volume is gradually reduced by adjusting the first flow valve 2 and the second flow valve 3. At each gas volume, the data acquisition and control box 13 uses data from the temperature and humidity sensor 12 at the top of the fluidized bed to positively feedback-adjust the first flow valve 2, the second flow valve 3, and the temperature control box 7 to ensure the experimental humidity is at the set level. After the flow stabilizes, filming is performed to ensure the high-speed camera 14 can capture the flow characteristics. Simultaneously, the pressure sensor 11 collects the pressure changes during the flow process to obtain the counterfluidization curve. After the experiment, first turn off fan 1, then close the first flow valves 2 and 3, and simultaneously turn off bubbler 6 and temperature control box 7. Once the particles are completely still, turn off high-speed camera 14. Post-process the pressure change data and fluidization characteristic images collected under different gas volumes to obtain the dry particle fluidization curve and particle flow characteristics. The pressure drop versus flow velocity curves within the fluidized bed at relative humidity of 0%, 0.2%, 0.4%, and 0.8% are shown below. Figure 2 As shown, the particle motion characteristics within the fluidized bed at relative humidity levels of 0%, 0.2%, 0.4%, and 0.8%, captured by a high-speed camera, are as follows: Figure 3 As shown.

[0053] In the description of this invention, it should be understood that the terms "longitudinal", "lateral", "up", "down", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this invention, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this invention.

[0054] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A device for studying the fluidization characteristics of wet particles with precise humidity control, characterized in that, include: Blower mechanism; The air passage structure has an air inlet end connected to the blower mechanism, and the air passage structure is used to divide the compressed air generated by the blower mechanism into two paths. The fluidized bed (9) is connected to the outlet of the gas path structure through the gas pre-distribution chamber (8), and the two compressed air streams are mixed into one stream before entering the gas pre-distribution chamber (8); A humidification mechanism is installed on the air passage structure, and the humidification mechanism is used to humidify one of the compressed air passages; A flow detection component is installed on the air path structure to obtain the flow rates of the two compressed air streams respectively; A flow control component is provided on the air passage structure to control the flow rates of the two compressed air paths respectively; A data acquisition component is installed on the fluidized bed (9) for acquiring temperature and humidity data and pressure difference data within the fluidized bed (9); The control mechanism is electrically connected to the flow detection component, the data acquisition component, and the flow control component, respectively. The control mechanism is used to adjust the opening of the flow control component in a positive feedback manner based on the data collected by the data acquisition component, so as to control the mixing ratio of the two compressed air streams.

2. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 1, characterized in that, The gas pre-distribution chamber (8) is located at the bottom of the fluidized bed (9) and is connected to the fluidized bed (9) through a distribution plate. The bottom end of the gas pre-distribution chamber (8) is connected to the gas outlet end of the gas path structure. Multiple spheres for dispersing gas are placed inside the gas pre-distribution chamber (8).

3. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 2, characterized in that, The humidification mechanism includes a bubbler (6), through which compressed air enters the inlet of the bubbler (6) and enters the gas pre-distribution chamber (8) through the outlet of the bubbler (6).

4. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 3, characterized in that, A temperature control box (7) for controlling the temperature inside the bubbler (6) is provided on the bubbler (6).

5. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 1, characterized in that, The control mechanism includes a control system (16), which is electrically connected to a data acquisition control box (13). The data acquisition control box (13) is electrically connected to the flow detection component, the data acquisition component, and the flow control component.

6. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 5, characterized in that, The flow detection component includes a first flow meter (4) and a second flow meter (5). The first flow meter (4) and the second flow meter (5) are used to detect the flow rates of the two compressed air streams, respectively. The first flow meter (4) and the second flow meter (5) are both electrically connected to the data acquisition and control box (13).

7. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 5, characterized in that, The flow control component includes a first flow valve (2) and a second flow valve (3). The first flow valve (2) and the second flow valve (3) are used to control the flow rates of the two compressed gases, respectively. The first flow valve (2) and the second flow valve (3) are both electrically connected to the data acquisition and control box (13).

8. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 5, characterized in that, The data acquisition component includes a pressure sensor (11) and a temperature and humidity sensor (12) mounted on the fluidized bed (9), and both the pressure sensor (11) and the temperature and humidity sensor (12) are electrically connected to the data acquisition control box (13).

9. The apparatus for studying the fluidization characteristics of wet particles for precise humidity control according to claim 5, characterized in that, A high-speed camera (14) and a light source (15) are provided on one side of the fluidized bed (9). The shooting end of the high-speed camera (14) faces the fluidized bed (9), and the lighting end of the light source (15) faces the fluidized bed (9). The high-speed camera (14) is electrically connected to the data acquisition control box (13).

10. A method of using the wet particle fluidization characteristic research apparatus for precise humidity control according to any one of claims 1-9, characterized in that, The steps are as follows: The blower generates compressed air, and the air path structure divides the compressed air into two paths and humidifies one of them. After the two compressed air paths are mixed, they enter the fluidized bed (9) through the gas pre-distribution chamber (8) to fluidize the particles (10) in the initial bed layer. The data acquisition component acquires the temperature and humidity data and pressure difference data in the fluidized bed (9) and sends them to the control mechanism. Based on the data acquired by the data acquisition component, the control mechanism adjusts the opening of the flow control component in a positive feedback manner to control the mixing ratio of the two compressed air streams so that the humidity in the fluidized bed (9) reaches the preset value. During the experiment, pressure change data and fluidization characteristic images were collected in the fluidized bed (9) to obtain particle fluidization, counterfluidization curves and particle flow characteristics.

Images