Material fluidized drying equipment and method

Abstract

The invention discloses material fluidization drying equipment, which is used for fluidizing and drying materials by heating gas and comprises a fluidization drying unit, a heat exchange unit, a heat exchange unit, a heat exchange unit, a heat exchange unit, a heat exchange unit and a heat exchange unit, wherein the fluidization drying unit consists of a heat-insulating layer and a plurality of material conveying pipes arranged in the heat-insulating layer; each material conveying pipe is used for feeding independently, and the to-be-dried material runs downwards and is fluidized and dried by the ascending heating gas in the descending process; and the circulating feeding unit is arranged on the periphery of the heat preservation layer and used for feeding materials to the material conveying pipe and feeding the dried materials into the material conveying pipe again, and circulating drying is formed. The invention further discloses a material fluidized drying method. According to the equipment and the method disclosed by the invention, the heated fluidizing gas is used for drying the material; materials can be circularly and repeatedly dried through the circular feeding unit; mass and heat transfer of the materials can be enhanced through the fluidized drying unit, and the drying efficiency is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of industrial drying equipment technology, and in particular to a material fluidization drying equipment and method. Background Technology

[0002] In industrial production processes, granular materials with high moisture content are often involved. To meet the requirements of storage, transportation, processing, and utilization, it is necessary to remove excess moisture from the materials to reduce their moisture content to the level required for production. Material drying technology removes non-bound water from the surface of materials through specific methods. Currently, widely used industrial drying methods include thermal drying, vacuum drying, spray drying, and freeze drying. Among these, thermal drying is the most widely used, utilizing heat energy to remove moisture from materials. This includes conduction drying, convection drying, radiation drying, and field drying. Drying involves a wide range of fields, and commonly used thermal drying equipment typically uses fossil fuels or industrial electricity to generate heat, making it a high-energy-consuming industry. Therefore, to achieve energy conservation and consumption reduction in the drying industry, efforts should be made to find drying technologies and equipment that utilize energy efficiently.

[0003] Fluidized bed drying utilizes hot gas to fluidize and dry granular materials. Fluidized bed drying boasts high mass and heat transfer rates, and the airflow and material particles undergo thorough convective contact during the drying process, resulting in complete material dispersion and a high drying rate. However, existing fluidized bed drying equipment suffers from problems such as uneven material movement, uneven fluidizing air distribution, and difficulty in controlling the discharge rate.

[0004] Chinese patent application CN109028766A discloses a fluidized bed drying device. Based on fluidized bed drying technology and centrifugal principles, this device integrates material drying, separation, and collection systems. It features uniform heating, adjustable drying time within the drying drum, rapid drying speed, thorough separation of dried products, and the ability to simultaneously collect multiple dried items separately, exhibiting a high degree of automation. The chamber consists of an inner heat-conducting layer, an intermediate heating layer, and an outer insulation layer, ensuring high thermal efficiency. It is equipped with a temperature controller and timer for automatic control. The fluidized bed exhibits uniform temperature distribution and excellent heat transfer. Temperature and airflow can be automatically controlled simultaneously to prevent uneven heating of materials, making it particularly suitable for drying heat-sensitive materials. The screw feeding mechanism is highly reliable; the dust removal device reduces dust in the exhaust gas, contributing to environmental protection; the equipment has a simple structure and is suitable for widespread use in drying and separating agricultural and chemical products.

[0005] The drying drum in this type of solution, which serves as a material-containing facility, has a large volume, which can lead to uneven material distribution and movement. At the same time, the uniformity of fluidizing air distribution will also be affected. The small processing capacity results in low drying efficiency and it cannot handle finer particles.

[0006] Therefore, there is an urgent need for a material fluidization drying equipment and method that can effectively improve the uniformity of material and fluidized air distribution and movement, and significantly improve drying efficiency.

[0007] The information disclosed in this background section is intended only to enhance the understanding of the overall background of the invention and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0008] The purpose of this invention is to provide a fluidized bed drying device and method for materials, which uses heated fluidized gas to dry materials; the circulating feeding unit enables repeated drying of materials; and the fluidized bed drying unit enhances mass and heat transfer of materials, effectively improving drying efficiency.

[0009] To achieve the above objectives, according to a first aspect of the present invention, the present invention provides a material fluidization drying apparatus that utilizes heated gas to fluidize and dry materials, comprising: a fluidization drying unit, which consists of an insulation layer and multiple material conveying pipes disposed within the insulation layer; each material conveying pipe is individually fed, the material to be dried moves downward and is fluidized and dried by the upward-moving heated gas during the downward movement; and a circulating feeding unit disposed around the insulation layer, which is used to provide feed to the material conveying pipes and to re-feed the dried material into the material conveying pipes, forming a circulating drying process.

[0010] Furthermore, in the above technical solution, each material conveying pipe is provided with an air inlet pipe at the bottom. The air inlet pipe can be provided with an upwardly inclined air inlet at different heights and in different directions, forming an overall spiral upward airflow, which is used to fluidize the material to be dried in the material conveying pipe.

[0011] Furthermore, in the above technical solution, the gas introduced into the air inlet pipe can be air heated by an electric heating furnace, and the heating temperature is preferably 200-300℃.

[0012] Furthermore, in the above technical solution, a spiral guide section can be set at the upper part of each material conveying pipe to guide the material to be dried to descend spirally and extend the residence time of the material in the material conveying pipe.

[0013] Furthermore, in the above technical solution, the spiral direction of the spiral guide section is preferably opposite to the spiral direction of the airflow generated by the intake pipe.

[0014] Furthermore, in the above technical solution, the circulating feeding unit can be arranged above, below, and on one side of the insulation layer of the fluidized drying unit, including: a spiral conveying pipe, which is vertically arranged on one side of the insulation layer and has a vertically extending spiral feeding mechanism inside, for conveying material from the bottom inlet pipe to the top; a spiral feeding pipe, which extends laterally above the insulation layer and communicates with the top of the spiral conveying pipe, and has a horizontally extending spiral feeding mechanism inside, for conveying material from the top of the spiral conveying pipe to each material conveying pipe; and a material collector, which extends laterally below the insulation layer and communicates with the bottom of the spiral conveying pipe, for receiving the dried material falling from the material conveying pipe and conveying it to the bottom of the spiral conveying pipe.

[0015] Furthermore, in the above technical solution, the material collector is preferably installed at an angle along the material conveying direction.

[0016] Furthermore, in the above technical solution, the material collector may be provided with an air inlet manifold, which can simultaneously supply air to the upward-extending air inlet pipe and the downward-extending purge pipe. The purge pipe is used to blow the material in the material collector along the conveying direction.

[0017] Furthermore, in the above technical solution, the device of the present invention may also include a dust removal unit, which is disposed on one side of the insulation layer and opposite to the spiral conveying pipe. Specifically, it may include: a cyclone separator, which is disposed above the spiral feed pipe and connected to the spiral feed pipe through a gas pipeline, for gas-solid separation; the gas after gas-solid separation is dusted by a bag filter; and a return leg, which is disposed at the bottom of the cyclone separator and connected to the material collector, for returning the material particles separated by gas-solid separation to the circulating feeding unit.

[0018] Furthermore, in the above technical solution, the insulation layer can be multi-layered, and a temperature sensor for monitoring temperature can be installed inside the insulation layer.

[0019] To achieve the above objectives, according to a second aspect of the present invention, the present invention provides a material fluidization drying method using any of the foregoing apparatus, comprising the following steps: A. Conveying the material to be dried to the upper part by vertical spiral feeding, and then providing feed to each material conveying pipe by horizontal spiral feeding; B. Under the action of the spiral upward airflow at the bottom of the material conveying pipe, the material to be dried is fluidized by heated gas and the residence time of the material in the material conveying pipe is extended; C. During the fluidization process of the material, the spiral upward heated gas dries the downward material; D. The dried material passes through an inclined material collector and repeats step A to form a circulating drying process.

[0020] Furthermore, in the above technical solution, step B may also include: the material feed into the material conveying pipe is guided to descend in a spiral at the inlet, and under the synergistic effect of the spiral rising airflow at the bottom, the residence time of the material in the material conveying pipe is further extended.

[0021] Furthermore, in the above technical solution, step D may also include: using heated gas to purge the dried material.

[0022] Furthermore, in the above technical solution, during the cyclic drying process, the method of the present invention may also include a dust removal step of gas-solid separation.

[0023] Compared with the prior art, the present invention has the following beneficial effects:

[0024] 1) This invention is based on the principle of fluidization, making full use of heated gas to fluidize particulate materials in the tube, and achieving material drying during the fluidization process. With this new technical concept, fluidized drying has a higher heat transfer rate. Compared with the drying containers used in the prior art, the airflow and material particles have sufficient convective contact during the drying process of this invention, which can make the material fully dispersed and uniformly heated in the tube, and has the advantages of high drying rate, compact structure and low maintenance cost.

[0025] 2) This invention utilizes multiple material conveying pipes within the insulation layer to fluidize the material within each pipe, achieving heat exchange during the fluidization process. Because the radial dimensions of these material conveying pipes are smaller than those of existing drying containers (e.g., drying drums), the uniformity of material heating during heat exchange is effectively ensured. Furthermore, the fluidized material is more easily retained within the slender material conveying pipes, guaranteeing a controllable residence time. The invention also enables cyclic drying through a circulating feeding unit. Therefore, it not only achieves multi-cycle cyclic drying but also ensures consistent residence time and heating uniformity of the material within each cycle, thereby effectively improving the drying efficiency in each cycle.

[0026] 3) This invention utilizes a spiral guide at the inlet of the material conveying pipe, allowing the material to spiral downwards under gravity and meet the spiraling upward airflow. When the spiral direction of the guide section is opposite to the spiral direction of the airflow generated by the inlet pipe, the fluidization state of the material in the material conveying pipe can be further enhanced. The inventors' experiments have verified that the combination of the spirally descending material and the spirally upward airflow produces a synergistic effect, which can further prolong the residence time of the material in the pipe.

[0027] 4) The circulating feeding unit of the present invention is arranged above, below and on one side of the insulation layer of the fluidized drying unit. By arranging the circulating feeding unit in this way, not only can the volume of the entire equipment be reduced to the maximum extent, but the feeding path can also be reduced, thus shortening the drying cycle time of the present invention.

[0028] 5) The main air intake pipe of the present invention can simultaneously supply air to the upward-extending air intake pipe and the downward-sloping purge pipe. The purge pipe can work with the inclined material collector to quickly transport materials and prevent material blockage.

[0029] 6) The drying equipment and method of this invention enable repeated drying of materials through a circulating feeding unit, achieving continuous and stable operation and good drying effect. Based on the fluidization principle, this invention achieves forced convection between gas and material, allowing the material to fully contact the heating gas and exchange heat in a fluidized state. The material is heated evenly, with high heat transfer efficiency and fast drying speed. By utilizing fluidized drying technology and a closed-loop fluidized equipment, the drying efficiency is even higher. The dust removal unit can prevent dust from being carried out, reducing environmental pollution. The entire set of equipment has a simple structure and is easy to operate.

[0030] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it according to the contents of the specification, and to make the above and other objects, technical features and advantages of the present invention easier to understand, one or more preferred embodiments are listed below and described in detail with reference to the accompanying drawings. Attached Figure Description

[0031] Figure 1 This is a schematic diagram of the external structure of the material fluidization drying equipment of the present invention.

[0032] Figure 2 This is a schematic diagram of the internal structure of the material fluidization drying equipment of the present invention.

[0033] Figure 3 This is a schematic diagram of the air inlet pipeline structure in the material fluidized drying equipment of the present invention.

[0034] Figure 4 yes Figure 3 Schematic diagram of the middle air intake pipe structure (showing the opening direction of the air intake holes at different heights).

[0035] Figure 5 yes Figure 4 Cross-sectional structural diagram.

[0036] Figure 6 This is a schematic diagram of the spiral guide section structure at the top of the material conveying pipe of the present invention.

[0037] Figure 7 This is a schematic diagram of the process of applying the material fluidization drying equipment of the present invention.

[0038] Explanation of key figure labels:

[0039] 100-Material fluidized bed drying equipment, 101-Compressor, 102-Gas buffer tank, 103-Electric heating furnace, 104-Bag dust collector;

[0040] 1-Insulation layer of fluidized drying unit, 11-Material conveying pipe, 111-Spiral guide section, 12-Temperature sensor, 2-Spiral conveying pipe, 20-First motor, 21-Vertical spiral feeding mechanism, 22-Discharge pipe, 3-Spiral feeding pipe, 30-Second motor, 31-Horizontal feeding mechanism, 4-Material collector, 5-Incoming material pipeline, 6-Cyclone separator, 61-Return leg, 62-Exhaust port, 7-Main air inlet pipe, 71-Air inlet pipe, 711-Air inlet hole, 72-Purge pipe. Detailed Implementation

[0041] The specific embodiments of the present invention will now be described in detail with reference to the accompanying drawings, but it should be understood that the scope of protection of the present invention is not limited to the specific embodiments.

[0042] Unless otherwise expressly stated, throughout the specification and claims, the term "comprising" or its variations such as "including" or "comprises" shall be understood to include the stated elements or components without excluding other elements or other components.

[0043] In this document, for ease of description, spatial relative terms such as “below,” “under,” “down,” “above,” “above,” “upper,” etc., are used to describe the relationship of one element or feature to another element or feature in the accompanying drawings. It should be understood that spatial relative terms are intended to encompass different orientations of an object in use or operation, in addition to those depicted in the figures. For example, if an object in the figure is flipped, an element described as “below” or “under” another element or feature would be oriented “above” that element or feature. Thus, the exemplary term “below” can encompass both the downward and upward orientations. An object may also have other orientations (rotated 90 degrees or other orientations), and the spatial relative terms used herein should be interpreted accordingly.

[0044] In this document, the terms "first," "second," etc., are used to distinguish two different elements or parts, and are not used to define specific positions or relative relationships. In other words, in some embodiments, the terms "first," "second," etc., can also be used interchangeably.

[0045] This invention is based on the principle of fluidization, making full use of hot gas to fluidize and dry particulate materials in the tube. This novel technical concept results in a higher heat transfer rate for fluidized drying. Compared to existing drying containers, this invention allows for sufficient convective contact between the airflow and material particles during the drying process, ensuring thorough dispersion and uniform heating within the tube. This results in advantages such as high drying rate, compact structure, and low maintenance costs.

[0046] Example 1

[0047] like Figure 1 , 2 As shown, this embodiment provides a material fluidization drying device that uses heated gas to fluidize materials and achieves drying during the fluidization process. The device includes at least a fluidization drying unit and a circulating feeding unit. The fluidization drying unit consists of an insulation layer 1 and multiple material conveying pipes 11 installed within the insulation layer. Each material conveying pipe 11 is fed individually, and the material to be dried moves downwards, where it is fluidized and dried by the upward-moving heated gas. The circulating feeding unit is located around the insulation layer 1 and is used to feed the material conveying pipes 11 and re-feed the dried material into the material conveying pipes 11, achieving circulating drying. Further, the insulation layer 1 can be an insulation material suitable for wrapping pipes (not shown in the figure), and the insulation material can be multi-layered. A temperature sensor 12 for monitoring temperature is installed inside the insulation layer 1.

[0048] The above-mentioned solution adopted in this embodiment uses multiple material conveying pipes 11 arranged within the insulation layer to fluidize the material within each pipe, achieving heat exchange during the fluidization process. Since the radial dimension of the material conveying pipes is smaller than that of existing drying containers (such as drying drums), the uniformity of heating the material during heat exchange can be effectively ensured. Furthermore, the fluidized material is more easily retained within the slender material conveying pipes, ensuring a controllable residence time. The circulating feeding unit enables cyclic drying. Therefore, the above-mentioned solution of the present invention not only achieves multi-cycle cyclic drying but also ensures the residence time and heating uniformity of the material in the tubes within each cycle, thereby effectively improving the drying efficiency within each cycle.

[0049] Further as Figures 2 to 5 As shown, to create better material fluidization conditions, each material conveying pipe 11 is equipped with an air inlet pipe 71 at its lower part. This air inlet pipe has upwardly extending air inlets 711 at different heights and in different directions, forming an overall spiral upward airflow for fluidizing the material to be dried within the material conveying pipe 11. Preferably, but not limitingly, the gas introduced into the air inlet pipe 71 can be heated air (see reference). Figure 7 It can be heated to 200-300℃ using an electric heating furnace 103. Further, as... Figure 2 As shown, preferably but not limitingly, a spiral guide section 111 may be provided at the upper part of each material conveying pipe (see reference). Figure 6 This device guides the material to be dried in a spiral descent and prolongs its residence time in the material conveying pipe. Through the spiral guide at the inlet of the material conveying pipe 11, the material descends spirally under gravity and encounters the spiraling upward airflow. When the spiral direction of the spiral guide section 111 is opposite to the spiral direction of the airflow generated by the inlet pipe 71, the fluidization state of the material in the material conveying pipe can be further enhanced. Experiments conducted by the inventors have verified that the combination of the spirally descending material and the spiraling upward airflow produces a synergistic effect, which can further prolong the residence time of the material in the pipe.

[0050] Further as Figure 1 , 2 As shown, the circulating feeding unit of this embodiment is arranged above, below, and on one side of the insulation layer 1 of the fluidized drying unit, including a spiral conveying pipe 2, a spiral feeding pipe 3, and a material collector 4. The spiral conveying pipe 2 is vertically arranged on one side of the insulation layer (i.e., the right side in the figure) and contains a vertically extending spiral feeding mechanism 21. This vertical spiral feeding mechanism 21 can be driven by a first motor 20 to convey material from the bottom inlet pipe 5 to the top of the spiral conveying pipe 2. The spiral feeding pipe 3 extends laterally above the insulation layer 1 and communicates with the top of the spiral conveying pipe. The spiral feeding pipe 3 contains a laterally extending spiral feeding mechanism 31, which can be driven by a second motor 30 to convey material from the top of the spiral conveying pipe to each material conveying pipe 11. The material collector 4 extends laterally below the insulation layer 1 and communicates with the bottom of the spiral conveying pipe 2 to receive the dried material falling from the material conveying pipe 11 and convey it to the bottom of the spiral conveying pipe 2. Preferably, but not limitingly, the material collector 4 is inclined along the material conveying direction, so that the falling material can return to the spiral conveying pipe 2 along the inclined surface, realizing the circulation of the material. This arrangement of the circulating feeding unit not only minimizes the overall size of the equipment but also effectively reduces the feeding path and shortens the drying cycle time of the present invention.

[0051] Further as Figure 2 , 3 As shown, the material collector 4 is equipped with an air inlet manifold 7, which can simultaneously supply air to the upward-extending air inlet pipe 71 (that is, the air inlet pipe set at the bottom of the material conveying pipe 11) and the downward-extending purge pipe 72. The purge pipe 72 is used to blow the material in the material collector 4 along the conveying direction. The purge pipe can work with the inclined material collector to quickly convey the material and prevent the material from getting stuck.

[0052] Further as Figure 1 , 2As shown, the device in this embodiment may further include a dust removal unit, which is located on one side of the insulation layer 1 and opposite to the spiral conveying pipe 2 (i.e., on the left side of the figure). Specifically, it may include a cyclone separator 6 and a return leg 61. The cyclone separator 6 is located above the spiral feed pipe 3 and is connected to the spiral feed pipe via a gas pipeline for gas-solid separation. The gas after gas-solid separation can enter the bag filter 104 for dust removal through the exhaust port 62. The return leg 61 is located at the bottom of the cyclone separator 6 and is connected to the material collector 4, used to return the separated material particles to the material collector 4 of the circulating feeding unit. Through the dust removal unit, materials entrained in the gas can be separated and removed. The separated gas can then be further processed and vented through the exhaust port 62.

[0053] Example 2

[0054] like Figures 1 to 7 As shown, this embodiment provides a material fluidization drying method, which uses the equipment in the aforementioned embodiment 1 and includes at least the following steps:

[0055] In step S101, the material to be dried is conveyed to the upper part by vertical spiral feeding, and then fed to each material conveying pipe by horizontal spiral feeding.

[0056] In step S102, under the action of the spiral upward airflow at the bottom of the material conveying pipe 11, the material to be dried is fluidized, and the residence time of the material in the material conveying pipe is extended. Preferably, but not limitingly, the feed into the material conveying pipe 11 can be guided to descend in a spiral at the inlet, and under the synergistic effect of the spiral upward airflow at the bottom, the residence time of the material in the material conveying pipe 11 is further extended. Through such a synergistic effect, the fluidization state of the material is further enhanced, which can further create conditions for sufficient contact and heat transfer between the material to be dried and the heating gas.

[0057] In step S103, during the fluidization process of the material, the upward-moving heating gas dries the downward-moving material. The specific process of this step can be found in the description of Example 1, and will not be repeated here.

[0058] In step S104, the dried material passes through the inclined material collector 4, and step S101 is repeated to form a circulating drying process. This completes one cycle of the circulating drying process of the present invention. Preferably, but not limitingly, in conjunction with the inclined feeding of the material collector 4, the same heating gas used in the fluidization process can also be used to purge the dried material.

[0059] Further as Figure 7As shown, the method of this embodiment further includes: after the air is compressed by the compressor 101, the compressed air is introduced into the gas buffer tank 102, and then the air from the gas buffer tank 102 is heated by the electric heating furnace 103 and introduced into the air inlet manifold 7 of the material fluidized drying unit 100 of the present invention to provide heating gas as fluidizing gas and purging gas for the fluidized drying equipment; in the process of realizing the circulating drying, a dust removal step of gas-solid separation can also be included. Through this step, the material entrained in the gas can be separated and removed, and the separated gas can be treated by the bag dust collector 104 and then released.

[0060] This invention employs the aforementioned drying equipment and method. Through a circulating feeding unit, materials can be repeatedly dried, achieving continuous and stable operation with excellent drying results. Based on the fluidization principle, this invention achieves forced convection between gas and material, allowing the material to fully contact and exchange heat with the heating gas in a fluidized state. This results in uniform heating, high heat transfer efficiency, and rapid drying. Utilizing fluidized bed drying technology and a closed-loop fluidized bed equipment, this invention achieves even higher drying efficiency. The dust removal unit prevents dust carryover, reducing environmental pollution. The entire system is simple in structure and easy to operate.

[0061] The foregoing description of specific exemplary embodiments of the present invention is for illustrative and explanatory purposes. These descriptions are not intended to limit the invention to the precise forms disclosed, and it will be apparent that many changes and variations can be made in accordance with the foregoing teachings. The exemplary embodiments were chosen and described in order to explain the specific principles of the invention and its practical application, thereby enabling those skilled in the art to implement and utilize various different exemplary embodiments of the invention, as well as various different choices and variations. Any simple modifications, equivalent changes, and alterations made to the foregoing exemplary embodiments should fall within the scope of protection of the present invention.

Claims

1. A fluidized bed drying device for materials, characterized in that, Fluidizing and drying materials using heated gas includes: The fluidized drying unit consists of an insulation layer and multiple material conveying pipes installed inside the insulation layer; each material conveying pipe is fed individually, and the material to be dried moves downward and is fluidized and dried by the upward heating gas during the downward movement; A circulating feeding unit is located around the insulation layer and is used to provide feed to the material conveying pipe and to re-feed the dried material into the material conveying pipe to form a circulating drying process.

2. The material fluidization drying equipment according to claim 1, characterized in that, Each of the material conveying pipes is equipped with an air inlet pipe at the bottom. The air inlet pipe has an upwardly extending air inlet at different heights and in different directions, forming an overall spiral upward airflow, which is used to fluidize the material to be dried in the material conveying pipe.

3. The material fluidization drying equipment according to claim 2, characterized in that, The gas introduced into the air inlet pipe is air heated by an electric heating furnace at a temperature of 200-300℃.

4. The material fluidization drying equipment according to claim 2, characterized in that, The upper part of each material conveying pipe is a spiral guide section, which is used to guide the material to be dried to descend spirally and prolong the residence time of the material in the material conveying pipe.

5. The material fluidization drying equipment according to claim 4, characterized in that, The spiral direction of the spiral guide section is opposite to the spiral direction of the airflow generated by the intake pipe.

6. The material fluidization drying equipment according to claim 1, characterized in that, The circulating feeding unit is arranged above, below, and on one side of the insulation layer of the fluidized drying unit, including: A spiral conveying pipe, which is vertically installed on one side of the insulation layer and has a vertically extending spiral feeding mechanism inside, is used to convey materials from the bottom inlet pipe to the top. A spiral feed pipe extends laterally above the insulation layer and communicates with the top of the spiral conveying pipe. The spiral feed pipe is provided with a laterally extending spiral feeding mechanism for conveying material from the top of the spiral conveying pipe to each of the material conveying pipes. A material collector extends laterally below the insulation layer and communicates with the bottom of the spiral conveying pipe, for receiving dry material falling from the material conveying pipe and conveying it to the bottom of the spiral conveying pipe.

7. The material fluidization drying equipment according to claim 6, characterized in that, The material collector is inclined along the material conveying direction.

8. The material fluidization drying equipment according to claim 7, characterized in that, The material collector is equipped with an air inlet manifold, which supplies air to both an upwardly extending air inlet pipe and a downwardly extending purge pipe. The purge pipe is used to blow the material in the material collector along the conveying direction.

9. The material fluidization drying equipment according to claim 6, characterized in that, The equipment also includes a dust removal unit, which is disposed on one side of the insulation layer and opposite to the spiral conveying pipe, and specifically includes: A cyclone separator is installed above the spiral feed pipe and connected to the spiral feed pipe via a gas pipeline for gas-solid separation; the gas after gas-solid separation is then filtered by a bag filter. The return leg, which is located at the bottom of the cyclone separator and communicates with the material collector, is used to return the material particles separated by gas-solid separation to the circulating feeding unit.

10. The material fluidization drying equipment according to claim 1, characterized in that, The insulation layer is multi-layered, and a temperature sensor for monitoring temperature is installed inside the insulation layer.

11. A method for fluidized bed drying of materials, characterized in that, Using the device as described in any one of claims 1 to 10, includes the following steps: A. The material to be dried is conveyed to the upper part by vertical spiral feeding, and then fed to each material conveying pipe by horizontal spiral feeding. B. Under the action of the spiral rising airflow at the bottom of the material conveying pipe, the material to be dried is fluidized by the heated gas and the residence time of the material in the material conveying pipe is extended. C. During the fluidization process of the material, the upward-moving heating gas dries the downward-moving material; D. The dried material passes through an inclined material collector and repeats step A to form a cycle drying process.

12. The material fluidization drying method according to claim 11, characterized in that, Step B further includes: the material feed into the material conveying pipe is guided to descend in a spiral at the inlet, and under the synergistic effect of the spiral rising airflow at the bottom, the residence time of the material in the material conveying pipe is further extended.

13. The material fluidization drying method according to claim 11, characterized in that, Step D further includes: using the heated gas to purge the dried material.

14. The material fluidization drying method according to claim 11, characterized in that, During the cyclic drying process, the method also includes a dust removal step involving gas-solid separation.

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