A fluidized bed dryer

Abstract

The utility model discloses a kind of boiling fluidized bed dryers, it is related to drying technical field.The utility model includes bottom plate and boiling fluidized bed body;Boiling fluidized bed body is fixedly connected at the upper top end of bottom plate, and the end of boiling fluidized bed body is fixedly connected nitrogen tank.The utility model is provided with vortex tube, since cold air is formed by the inner layer airflow of one end of vortex tube, the other end of vortex tube discharges outside airflow to form hot air, so the hot gas discharge end of vortex tube is connected with hot gas pipe, and the hot gas pipe is connected with second exhaust pipe, when the gas in the inside of hot gas pipe enters the inside of second exhaust pipe, it is wrapped up and carried by the gas moving in the inside of second exhaust pipe, and drives it to enter the inside of four-way pipe, and the gas of second exhaust pipe is heated, and after entering the inside of four-way pipe, the flow speed of gas can be increased, and the drying of material is accelerated.

Description

Technical Field

[0001] This utility model belongs to the field of drying technology, and in particular relates to a fluidized bed dryer (supplement). Background Technology

[0002] The fluidized bed dryer utilizes fluidization technology to make granular materials appear to be in a state similar to liquid boiling under the action of hot air. This greatly increases the contact area between the material and the hot air, and enhances the heat transfer and mass transfer processes. This unique drying method greatly improves drying efficiency and can complete the drying of materials in a shorter time. At the same time, because the material is violently tumbling in the bed, the drying uniformity is good, effectively avoiding the problems of local overheating or insufficient drying.

[0003] In many industrial production scenarios, material drying is a critical step. However, existing drying technologies have significant shortcomings in dealing with different material moisture levels and improving drying efficiency. Traditional drying methods often struggle to achieve precise temperature control in different areas of the material. Due to the differences in moisture levels among different materials, if the temperature cannot be flexibly adjusted according to the actual condition of the material during the drying process, some materials may deteriorate due to excessively high temperatures, while others may not dry thoroughly due to insufficient temperatures, seriously affecting product quality and stability. Utility Model Content

[0004] The purpose of this invention is to provide a fluidized bed dryer that utilizes the hot and cold air discharge ends of the vortex tubes separately. This solves the problem in the prior art where, due to differences in the moisture content of different materials, if the temperature cannot be flexibly adjusted according to the actual condition of the materials during the drying process, some materials may deteriorate due to excessively high temperatures, while others may not dry completely due to insufficient temperatures.

[0005] To solve the above-mentioned technical problems, this utility model is achieved through the following technical solution:

[0006] This utility model relates to a fluidized bed dryer, comprising a base plate and a fluidized bed body. The fluidized bed body is fixedly connected to the top of the base plate, and a nitrogen tank is fixedly connected to the end of the fluidized bed body. A gas transmission mechanism for drawing gas from the nitrogen tank is provided on one side of the top of the base plate near the fluidized bed body. A gas discharge mechanism for discharging gas is provided on the top of the fluidized bed body. A temperature control mechanism for regulating the temperature of different areas inside the fluidized bed body is provided on the top of the base plate below the fluidized bed body. A suction mechanism, which works in conjunction with the gas transmission mechanism and the gas discharge mechanism, is provided on the top of the base plate and the outer wall of the fluidized bed body to accelerate the entry and exit of gas.

[0007] The present invention is further configured such that a nitrogen inlet pipe and a nitrogen outlet pipe are respectively reserved at the top and bottom of the nitrogen tank; a PLC controller is fixedly connected at the center of the outer side wall of the fluidized bed body; and three feed pipes are fixedly connected at the top of the fluidized bed body to facilitate material entry, with a sealing cap threaded onto the end of each feed pipe.

[0008] The present invention is further configured such that the gas transmission mechanism includes a first partition plate and a second partition plate fixedly connected to the inner side wall of the fluidized bed body. The interior of the fluidized bed body is divided into three different regions by the first partition plate and the second partition plate. A gas sprayer is fixedly connected to the bottom end of the fluidized bed body corresponding to the three regions. A first exhaust pipe is fixedly connected to the bottom end of the nitrogen tank at the end of the nitrogen exhaust pipe. The first exhaust pipe communicates with the interior of the suction mechanism at the top of the bottom plate. A gas heater is fixedly connected to the top of the bottom plate on one side of the first exhaust pipe. The exhaust end of the suction mechanism at the top of the bottom plate communicates with the interior of the gas heater through the first exhaust pipe.

[0009] The present invention is further configured such that a second exhaust pipe is fixedly connected to the gas discharge end of the gas heater, a four-way pipe is fixedly connected to the bottom end of the fluidized bed body, three of the pipes of the four-way pipe are connected to the inlet end of the gas sprayer, the exhaust end of each gas sprayer is connected to the interior of the fluidized bed body, the end of the second exhaust pipe away from the gas heater is connected to the other end of the four-way pipe through a gas distributor, two solenoid valves for controlling the airflow are symmetrically fixedly connected to the outer wall of the four-way pipe, and temperature sensors are fixedly connected to both ends of the inner wall of the fluidized bed body and the side of the first partition plate near the second partition plate, and the temperature sensors establish a communication connection with the PLC controller through a wireless transmission module.

[0010] The present invention is further configured such that the gas discharge mechanism includes four suction pipes fixedly connected to the top of the fluidized bed body, and the suction pipes are connected to the interior of the gas discharge mechanism. Each suction pipe is located on one side of each feed pipe. A third exhaust pipe is provided at the top of the fluidized bed body. The suction end of the third exhaust pipe is connected to the discharge end of the four suction pipes. A guide pipe is fixedly connected to the discharge end of the third exhaust pipe. A suction mechanism is provided on the outer wall of the fluidized bed body, and the guide pipe is connected to the interior of the suction mechanism.

[0011] The present invention is further configured such that the temperature control mechanism includes a cold air tee pipe fixedly connected to the outer wall of the four-way pipe, the two ends of the cold air tee pipe are respectively located on the side of the two solenoid valves that are far apart from each other, a vortex tube is provided on one side of the cold air tee pipe, the cold air discharge end of the vortex tube is connected to the air inlet end of the cold air tee pipe, a distributor for diverting the cold air discharged by the vortex tube is fixedly installed at the intersection of the cold air discharge end of the vortex tube and the cold air tee pipe, and the air inlet end of the vortex tube is connected to the external compressed air discharge end.

[0012] The present invention is further configured such that a hot air pipe is fixedly connected to the hot air discharge end of the vortex tube, the end of the hot air pipe away from the vortex tube is fixedly connected to the outer wall of the second exhaust pipe, and the hot air pipe communicates with the interior of the second exhaust pipe. A one-way valve to prevent gas backflow into the vortex tube is fixedly connected to the outer wall of the hot air pipe, and two identical one-way valves to prevent gas backflow into the vortex tube are symmetrically fixedly connected to the outer wall of the cold air three-way pipe.

[0013] The present invention is further configured such that each group of suction mechanisms includes a suction frame, and a suction fan is bolted to the inside of the suction frame. The suction fan located inside the top suction frame on the bottom plate is used to extract nitrogen from the nitrogen tank, and the suction fan located inside the suction frame on the outer wall of the boiling fluidized bed body is used to extract gas from the inside of the boiling fluidized bed body.

[0014] This utility model has the following beneficial effects:

[0015] 1. This utility model incorporates a vortex tube, connecting its compressed air inlet to an external compressed air outlet. When compressed air rapidly enters the vortex tube, a high-speed rotating vortex forms inside. Under centrifugal force, the gas is separated into two parts. The outer airflow rotates more slowly, and due to the specific structure of the vortex tube, its kinetic energy is gradually converted into heat energy, causing its temperature to rise and exiting from the hot end outlet. The inner airflow rotates extremely fast, and due to centrifugal force, it contracts towards the center, reducing its pressure. Simultaneously, it interacts with the outer airflow... There is heat exchange between the flow streams. The temperature of the inner airflow decreases and flows out from the cold end outlet. The inner airflow will enter the interior of the gas sprayer through the cold air tee and mix with the hot air inside, thereby reducing the temperature of the hot air. The three pipes of the four-way pipe enter the interior of different gas sprayers. The interior of the fluidized bed body is divided into three parts by the first partition plate. Therefore, after the inner airflow enters the interior of the gas sprayer, it can effectively regulate the temperature of the three different areas inside the fluidized bed body, thereby achieving the purpose of drying materials with different moisture levels.

[0016] 2. This utility model incorporates a vortex tube. One end of the vortex tube discharges inner airflow to form cold air, while the other end discharges outer airflow to form hot air. The hot air discharge end of the vortex tube is connected to a hot air pipe, which is connected to a second exhaust pipe. When the gas inside the hot air pipe enters the second exhaust pipe, it is carried by the moving gas inside the second exhaust pipe and drawn into the four-way pipe, where it heats the gas in the second exhaust pipe. After entering the four-way pipe, the gas flow rate is increased, accelerating the drying of the material. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments 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.

[0018] Figure 1 This is a schematic diagram of the overall structure of a fluidized bed dryer.

[0019] Figure 2 This is a schematic diagram of the overall back structure of a fluidized bed dryer.

[0020] Figure 3 A schematic diagram of the structure at the bottom of the fluidized bed body in a fluidized bed dryer;

[0021] Figure 4 This is a schematic diagram showing the structure of a fluidized bed body in a fluidized bed dryer.

[0022] Figure 5 This is a schematic diagram of the temperature control mechanism in a fluidized bed dryer.

[0023] Figure 6 This is a schematic diagram of the split structure of the suction rack in a fluidized bed dryer.

[0024] In the diagram: 1. Base plate; 2. Fluidized bed body; 3. Nitrogen tank; 31. Nitrogen inlet pipe; 32. Nitrogen outlet pipe; 4. PLC controller; 5. Gas transmission mechanism; 51. Gas sprayer; 52. First exhaust pipe; 521. Second exhaust pipe; 53. Gas heater; 54. First partition plate; 541. Second partition plate; 55. Temperature sensor; 56. Four-way pipe; 57. Solenoid valve; 6. Gas exhaust mechanism; 61. Suction pipe; 62. Third exhaust pipe; 63. Guide pipe; 7. Feed pipe; 8. Sealing cover; 9. Suction mechanism; 91. Suction frame; 92. Suction fan; 10. Temperature control mechanism; 101. Vortex tube; 102. Cold air three-way pipe; 103. Diverter; 104. Hot air pipe; 105. Check valve. Detailed Implementation

[0025] 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 skilled in the art without creative effort are within the protection scope of the present utility model.

[0026] Please see Figure 1 - Figure 6 As shown, a fluidized bed dryer includes a base plate 1 and a fluidized bed body 2. The fluidized bed body 2 is fixedly connected to the top of the base plate 1, and a nitrogen tank 3 is fixedly connected to the end of the fluidized bed body 2. A gas transmission mechanism 5 is provided on one side of the top of the base plate 1 to draw out the gas inside the nitrogen tank 3. A gas discharge mechanism 6 is provided on the top of the fluidized bed body 2 to discharge the gas. A temperature control mechanism 10 is provided on the top of the base plate 1 below the fluidized bed body 2 to regulate the temperature of different areas inside the fluidized bed body 2. A suction mechanism 9 is provided on the top of the base plate 1 and the outer wall of the fluidized bed body 2 to cooperate with the gas transmission mechanism 5 and the gas discharge mechanism 6 to accelerate the entry and exit of the gas.

[0027] It should be noted that the nitrogen tank 3 is connected to the fluidized bed body 2 and, together with the gas transmission mechanism 5, can stably introduce nitrogen into the fluidized bed, providing an inert gas environment for material drying. This effectively prevents adverse reactions such as oxidation during the drying process, ensuring product quality. The gas discharge mechanism 6 can promptly discharge the dried gas, maintaining good gas circulation within the fluidized bed and ensuring continuous and efficient drying. The temperature control mechanism 10 is located on the base plate 1 and below the fluidized bed body 2, precisely controlling the temperature of different areas within the fluidized bed to meet the diverse temperature requirements of different materials at different drying stages, improving drying effect and uniformity. The suction mechanism 9, in conjunction with the gas transmission mechanism 5 and the gas discharge mechanism 6, can accelerate the speed of gas entry and exit, further improving drying efficiency, shortening the drying cycle, and reducing energy consumption.

[0028] In an optional embodiment, nitrogen tank 3 has a nitrogen inlet pipe 31 and a nitrogen outlet pipe 32 pre-installed at the top and bottom of the nitrogen tank, respectively. A PLC controller 4 is fixedly connected to the center of the outer side wall of the fluidized bed body 2. Three feed pipes 7 are fixedly connected to the top of the fluidized bed body 2 to facilitate material entry. Each feed pipe 7 has a sealing cap 8 threaded onto its end.

[0029] It should be noted that the PLC controller 4 fixed at the center of the outer wall of the fluidized bed body 2 can accurately and automatically control the entire drying process. It can flexibly adjust parameters such as temperature and gas flow rate according to the preset program to ensure stable drying conditions and improve the consistency and controllability of the drying effect. The three feed pipes 7 fixed at the top of the fluidized bed body 2 increase the channels for material entry, allowing different types or batches of materials to be added simultaneously or in batches, improving feeding efficiency and meeting the needs of large-scale production. The sealing cap 8 with threaded sleeve at the end of each feed pipe 7 has good sealing performance and can tightly seal the feed pipe 7 after feeding, preventing nitrogen leakage and the entry of external impurities during the drying process, maintaining a stable gas environment and cleanliness inside the fluidized bed, and further ensuring the drying effect and product quality.

[0030] In an optional embodiment, the gas transmission mechanism 5 includes a first partition plate 54 and a second partition plate 541 fixedly connected to the inner wall of the fluidized bed body 2. The interior of the fluidized bed body 2 is divided into three different regions by the first partition plate 54 and the second partition plate 541. A gas sprayer 51 is fixedly connected to the bottom end of the fluidized bed body 2 corresponding to these three regions. A first exhaust pipe 52 is fixedly connected to the bottom end of the nitrogen tank 3 at the end of the nitrogen exhaust pipe 32. The first exhaust pipe 52 communicates with the interior of the suction mechanism 9 at the top of the bottom plate 1. A gas heater 53 is fixedly connected to the top of the bottom plate 1 on one side of the first exhaust pipe 52. The exhaust end of the suction mechanism 9 at the top of the bottom plate 1 communicates with the interior of the gas heater 53 through the first exhaust pipe 52. A second exhaust pipe 521 is fixedly connected to the gas discharge end of the heater 53. A four-way pipe 56 is fixedly connected to the bottom end of the fluidized bed body 2. Three of the pipes of the four-way pipe 56 are connected to the inlet end of the gas sprayer 51. The exhaust end of each gas sprayer 51 is connected to the interior of the fluidized bed body 2. The end of the second exhaust pipe 521 away from the gas heater 53 is connected to the other end of the four-way pipe 56 through the gas distributor 103. Two solenoid valves 57 for controlling the airflow are symmetrically fixedly connected to the outer wall of the four-way pipe 56. Temperature sensors 55 are fixedly connected to both ends of the inner wall of the fluidized bed body 2 and the side of the first partition plate 54 near the second partition plate 541. The temperature sensors 55 establish a communication connection with the PLC controller 4 through a wireless transmission module.

[0031] It should be noted that the first partition plate 54 and the second partition plate 541 divide the interior of the fluidized bed body 2 into three different areas. Combined with three gas sprayers 51, nitrogen can be precisely delivered according to the needs of different areas, resulting in more uniform material drying. Nitrogen from the nitrogen tank 3 enters the suction mechanism 9 through the first exhaust pipe 52, then enters the gas heater 53 for heating. It is then distributed to each gas sprayer 51 via the second exhaust pipe 521, the gas distributor 103, and the four-way pipe 56, forming a complete gas transmission and heating path. This ensures that the nitrogen entering the fluidized bed is at a suitable temperature, improving drying efficiency. The two solenoid valves 57 can flexibly... By controlling the airflow and adjusting the nitrogen flow rate according to the actual drying conditions, a balance between energy saving and efficient drying is achieved. Multiple temperature sensors 55 are respectively arranged at both ends of the inner wall of the fluidized bed body 2 and on one side of the first partition plate 54. They can monitor the temperature of different areas in real time and transmit the data to the PLC controller 4 through a wireless transmission module. The PLC controller 4 then precisely controls the power of the gas heater 53 and the opening of the solenoid valve 57 to ensure that the temperature of each area is stable within the optimal drying range, thus ensuring the drying quality of the material and improving the overall drying effect. The model of the temperature sensor 55 can be FST600-400 (not specifically specified).

[0032] In an optional embodiment, the gas discharge mechanism 6 includes four suction pipes 61 fixedly connected to the top of the fluidized bed body 2, and the suction pipes 61 communicate with the interior of the gas discharge mechanism 6. Each suction pipe 61 is located on one side of each feed pipe 7. A third exhaust pipe 62 is provided at the top of the fluidized bed body 2. The suction end of the third exhaust pipe 62 is connected to the discharge end of the four suction pipes 61. A guide pipe 63 is fixedly connected to the discharge end of the third exhaust pipe 62. A suction mechanism 9 is provided on the outer wall of the fluidized bed body 2, and the guide pipe 63 communicates with the interior of the suction mechanism 9.

[0033] It should be noted that the four suction pipes 61 are fixed to the top of the fluidized bed body 2 and are arranged adjacent to the feed pipes 7. This can efficiently capture the gas generated after drying in different feed areas, avoid local gas accumulation, ensure gas discharge without dead corners, and make the drying environment more stable. The suction end of the third exhaust pipe 62 is connected to the discharge end of the four suction pipes 61, which can collect the gas discharged from each suction pipe 61. Then, through the gas guide pipe 63 connected to its discharge end, the gas is smoothly guided to the suction mechanism 9. The suction mechanism 9 is connected to the gas guide pipe 63 and can generate a strong suction force to quickly extract the gas in the fluidized bed, maintain a suitable gas pressure in the bed, promote the circulation of nitrogen in the bed, and further improve the drying effect. At the same time, timely discharge of gas can prevent the material from getting damp or other adverse reactions due to gas retention, ensuring the drying quality of the material. The other end of the gas guide pipe 63 can be connected to a cyclone separator, which separates impurities in the gas and reintroduces it into the nitrogen tank 3.

[0034] In an optional embodiment, the temperature control mechanism 10 includes a cold air tee pipe 102 fixedly connected to the outer wall of the four-way pipe 56. The two ends of the cold air tee pipe 102 are located on opposite sides of the two solenoid valves 57. A vortex pipe 101 is provided on one side of the cold air tee pipe 102. The cold air exhaust end of the vortex pipe 101 is connected to the air inlet end of the cold air tee pipe 102. A diverter 103 for diverting the cold air discharged from the vortex pipe 101 is fixedly installed at the intersection of the cold air exhaust end of the vortex pipe 101 and the cold air tee pipe 102. The air inlet of 1 is connected to the external compressed air outlet. The hot air outlet of the vortex tube 101 is fixedly connected to a hot air pipe 104. The end of the hot air pipe 104 away from the vortex tube 101 is fixedly connected to the outer wall of the second exhaust pipe 521, and the hot air pipe 104 communicates with the interior of the second exhaust pipe 521. A one-way valve 105 is fixedly connected to the outer wall of the hot air pipe 104 to prevent gas from flowing back into the vortex tube 101. Two identical one-way valves 105 are symmetrically fixedly connected to the outer wall of the cold air three-way pipe 102 to prevent gas from flowing back into the vortex tube 101.

[0035] It should be noted that the vortex tube 101 connects to the external compressed air discharge end and can separate the compressed air into two streams, cold and hot. The hot air is introduced into the second exhaust pipe 521 through the hot air pipe 104, which can reheat the nitrogen entering the fluidized bed, improve energy utilization, and reduce additional heating energy consumption. The cold air is evenly distributed to the two areas through the cold air tee pipe 102 under the action of the distributor 103, which can precisely control the temperature of different parts of the fluidized bed. The two ends of the cold air tee pipe 102 are located on the sides of the two solenoid valves 57 that are far apart from each other, which can flexibly control the temperature of different areas. The cold air input is adjusted to meet the different temperature requirements of materials at different locations, ensuring uniform and stable temperature during the drying process and improving the drying quality of materials. The one-way valve 105 is cleverly designed. The one-way valve 105 on the outer wall of the hot air pipe 104 and the cold air three-way pipe 102 can effectively prevent gas from flowing back into the vortex tube 101, ensuring that the cold and hot air flow in the set direction and maintaining the normal working state of the vortex tube 101. The vortex tube 101 is existing technology and will not be described in detail here. The model of the vortex tube 101 can be SR-W15 (not specifically specified).

[0036] In an optional embodiment, each suction mechanism 9 includes a suction frame 91, and a suction fan 92 is bolted to the inside of the suction frame 91. The suction fan 92 located inside the top suction frame 91 on the bottom plate 1 is used to extract nitrogen from the nitrogen tank 3, and the suction fan 92 located inside the suction frame 91 on the outer wall of the boiling fluidized bed body 2 is used to extract gas from the boiling fluidized bed body 2.

[0037] It should be noted that the suction fan 92 inside the suction frame 91 located at the top of the bottom plate 1 can efficiently extract nitrogen from the nitrogen tank 3, providing a stable and sufficient nitrogen supply for the entire drying process. This ensures that the material is dried in an inert gas environment, effectively preventing material oxidation and deterioration, and guaranteeing product quality. Meanwhile, the suction fan 92 inside the suction frame 91 on the outer wall of the fluidized bed body 2 can promptly extract the gas generated inside the fluidized bed body 2 after drying, maintaining a suitable gas pressure and gas circulation environment inside the bed. This not only accelerates the drying speed and improves drying efficiency, but also avoids problems such as material dampness or uneven drying caused by gas accumulation inside the bed.

[0038] Working principle: When the fluidized bed dryer is working, the compressed air inlet end of the vortex tube 101 is connected to the external compressed air outlet end. The compressed air enters the vortex tube 101 quickly and forms a high-speed rotating vortex inside. Under the influence of centrifugal force, the gas is separated into two parts. The outer airflow rotates slowly and its kinetic energy is converted into heat energy. The temperature rises and it flows out from the hot end through the hot gas pipe 104. Since the hot gas pipe 104 is connected to the second exhaust pipe 521, the hot gas is carried into the four-way pipe 56 after entering, which heats the gas in the second exhaust pipe 521, increases the gas flow speed, and accelerates the drying of the material.

[0039] The inner airflow rotates rapidly, contracts towards the center, reduces pressure, and exchanges heat with the outer airflow, causing the temperature to drop. It flows out from the cold end through the cold air tee pipe 102, and after being split by the distributor 103, it enters the gas sprayer 51, where it mixes with the hot air to further reduce the temperature. At the same time, the four-way pipe 56 connects three pipes to different gas sprayers 51, and the fluidized bed body 2 is divided into three parts by the first partition plate 54 and the second partition plate 541. After the inner airflow enters the gas sprayer 51, it can effectively regulate the temperature of the three different areas inside the fluidized bed body 2 to dry materials with different moisture levels.

[0040] In addition, nitrogen from nitrogen tank 3 enters the boiling fluidized bed body 2 through suction mechanism 9, gas heater 53, etc., and gas discharge mechanism 6 promptly extracts waste gas to ensure a stable and efficient drying process.

[0041] In the description of this specification, references to terms such as "an embodiment," "example," "specific example," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0042] The preferred embodiments of this utility model disclosed above are merely illustrative of the present utility model. These preferred embodiments do not exhaustively describe all details, nor do they limit the utility model to the specific implementations described. Clearly, many modifications and variations can be made based on the content of this specification. This specification selects and specifically describes these embodiments to better explain the principles and practical applications of this utility model, thereby enabling those skilled in the art to better understand and utilize it. This utility model is limited only by the claims and their full scope and equivalents.

Claims

1. A fluidized bed dryer, comprising a base plate (1) and a fluidized bed body (2); characterized in that: The boiling fluidized bed body (2) is fixedly connected to the top of the bottom plate (1). The end of the boiling fluidized bed body (2) is fixedly connected to the nitrogen tank (3). The top of the bottom plate (1) is provided with a gas transmission mechanism (5) to draw out the gas inside the nitrogen tank (3) on one side of the boiling fluidized bed body (2). The top of the boiling fluidized bed body (2) is provided with a gas discharge mechanism (6) to discharge the gas. The top of the bottom plate (1) is provided with a temperature control mechanism (10) to regulate the temperature of different areas inside the boiling fluidized bed body (2) below the boiling fluidized bed body (2). The top of the bottom plate (1) and the outer wall of the boiling fluidized bed body (2) are provided with a suction mechanism (9) that cooperates with the gas transmission mechanism (5) and the gas discharge mechanism (6) to accelerate the entry and exit of the gas.

2. The fluidized bed dryer according to claim 1, characterized in that, The nitrogen tank (3) has a nitrogen inlet pipe (31) and a nitrogen outlet pipe (32) pre-installed at the top and bottom of the nitrogen tank (3), respectively. A PLC controller (4) is fixedly connected to the center of the outer side wall of the fluidized bed body (2). Three feed pipes (7) are fixedly connected to the top of the fluidized bed body (2) to facilitate material entry. Each feed pipe (7) has a sealing cap (8) threaded onto its end.

3. A fluidized bed dryer according to claim 1, characterized in that, The gas transmission mechanism (5) includes a first partition plate (54) and a second partition plate (541) fixedly connected to the inner side wall of the fluidized bed body (2). The interior of the fluidized bed body (2) is divided into three different regions through the first partition plate (54) and the second partition plate (541). A gas sprayer (51) is fixedly connected to the bottom end of the fluidized bed body (2) corresponding to the three regions. The bottom end of the nitrogen tank (3) is fixedly connected to the end of the nitrogen discharge pipe (32) with a first exhaust pipe (52). The first exhaust pipe (52) is connected to the interior of the suction mechanism (9) at the top of the bottom plate (1). A gas heater (53) is fixedly connected to the side of the first exhaust pipe (52) at the top of the bottom plate (1). The discharge end of the suction mechanism (9) at the top of the bottom plate (1) is connected to the interior of the gas heater (53) through the first exhaust pipe (52).

4. A fluidized bed dryer according to claim 3, characterized in that, The gas heater (53) is fixedly connected to a second exhaust pipe (521) at its gas outlet end. The bottom end of the fluidized bed body (2) is fixedly connected to a four-way pipe (56). Three of the pipes of the four-way pipe (56) are connected to the inlet end of the gas sprayer (51). The exhaust end of each gas sprayer (51) is connected to the interior of the fluidized bed body (2). The end of the second exhaust pipe (521) away from the gas heater (53) is connected to the other end of the four-way pipe (56) through a gas distributor (103). Two solenoid valves (57) for controlling the airflow are symmetrically fixedly connected to the outer wall of the four-way pipe (56). Temperature sensors (55) are fixedly connected to both ends of the inner wall of the fluidized bed body (2) and to the side of the first partition plate (54) near the second partition plate (541). The temperature sensors (55) establish a communication connection with the PLC controller (4) through a wireless transmission module.

5. A fluidized bed dryer according to claim 2, characterized in that, The gas discharge mechanism (6) includes four suction pipes (61) fixedly connected to the top of the boiling fluidized bed body (2), and the suction pipes (61) are connected to the interior of the gas discharge mechanism (6). Each suction pipe (61) is located on one side of each feed pipe (7). A third exhaust pipe (62) is provided at the top of the boiling fluidized bed body (2). The suction end of the third exhaust pipe (62) is connected to the discharge end of the four suction pipes (61). A guide pipe (63) is fixedly connected to the discharge end of the third exhaust pipe (62). A suction mechanism (9) is provided on the outer wall of the boiling fluidized bed body (2). The guide pipe (63) is connected to the interior of the suction mechanism (9).

6. A fluidized bed dryer according to claim 4, characterized in that, The temperature control mechanism (10) includes a cold air tee pipe (102) fixedly connected to the outer wall of the four-way pipe (56). The two ends of the cold air tee pipe (102) are located on the side away from each other of the two solenoid valves (57). A vortex pipe (101) is provided on one side of the cold air tee pipe (102). The cold air discharge end of the vortex pipe (101) is connected to the air inlet end of the cold air tee pipe (102). A diverter (103) for diverting the cold air discharged by the vortex pipe (101) is fixedly installed at the intersection of the cold air discharge end of the vortex pipe (101) and the cold air tee pipe (102). The air inlet end of the vortex pipe (101) is connected to the external compressed air discharge end.

7. A fluidized bed dryer according to claim 6, characterized in that, The hot air exhaust end of the vortex tube (101) is fixedly connected to a hot air pipe (104). The end of the hot air pipe (104) away from the vortex tube (101) is fixedly connected to the outer wall of the second exhaust pipe (521), and the hot air pipe (104) communicates with the interior of the second exhaust pipe (521). A one-way valve (105) to prevent gas backflow into the vortex tube (101) is fixedly connected to the outer wall of the hot air pipe (104). Two identical one-way valves (105) to prevent gas backflow into the vortex tube (101) are symmetrically fixedly connected to the outer wall of the cold air three-way pipe (102).

8. A fluidized bed dryer according to claim 1, characterized in that, Each of the suction mechanisms (9) includes a suction frame (91), and a suction fan (92) is bolted to the inside of the suction frame (91). The suction fan (92) located inside the top suction frame (91) on the bottom plate (1) is used to extract nitrogen from the nitrogen tank (3), and the suction fan (92) located inside the suction frame (91) on the outer wall of the boiling fluidized bed body (2) is used to extract gas from the boiling fluidized bed body (2).

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