Solid material fluidization radio frequency sterilization equipment and method

Abstract

The invention relates to solid material fluidization radio frequency sterilization equipment and method, and belongs to the field of radio frequency sterilization drying, and the solid material fluidization radio frequency sterilization equipment comprises a material fluidization system, a radio frequency processing system and an air supply and exhaust circulation system. The material fluidization system sprays gas into a stirring shaft through a paddle type spiral stirrer, so that solid materials are uniformly suspended and are in a flow state, the contact area of radio frequency energy and the materials is increased, and heat transfer is promoted. The radio-frequency treatment system utilizes radio-frequency energy generated by a radio-frequency polar plate to sterilize materials, and the solid-gas separation device separates powder and gas to ensure effective inhibition of microorganisms. The air supply and exhaust circulation system introduces gas through the air inlet device to maintain the material flow state, the air exhaust device exhausts the treated gas, and the circulation air duct achieves cyclic utilization of the gas. The equipment has the characteristics of high efficiency, energy conservation, no chemical residue and the like, can realize rapid and uniform sterilization of solid food, improves the sterilization efficiency of the solid food, and is suitable for high-efficiency sterilization treatment in large-scale production.

Description

Technical Field

[0001] The invention relates to a fluidized radio frequency sterilization device and method for solid materials, belonging to the technical field of radio frequency sterilization and drying. Background Art

[0002] At present, the sterilization technology of solid food faces many challenges. Traditional sterilization methods, such as dry heat and irradiation, have obvious limitations: dry heat usually needs to be processed at high temperature (about 160°C), and due to low mass transfer efficiency and long heating time, it is not only easy to cause the degradation of nutrients and the deterioration of food quality, but also its sterilization effect is relatively limited; irradiation is prone to consumer resistance due to potential safety risks.

[0003] In contrast, radio frequency sterilization technology uses the thermal effect generated by the electromagnetic field to act on the cell membrane of microorganisms, destroying their structure, thereby inhibiting or killing microorganisms. Due to the high moisture content in microorganisms, they can absorb radio frequency energy more effectively than low-moisture materials, so that a good sterilization effect can be achieved under the condition that the material temperature is controlled at a low level (about 100°C). Therefore, radio frequency sterilization has become an ideal alternative with its advantages of deep penetration, high heat transfer efficiency, no chemical residues, and suitability for batch processing, effectively killing contaminating microorganisms in food.

[0004] However, the existing radio frequency sterilization technology still faces some technical bottlenecks, such as corner effect and thermal offset phenomenon, which lead to non-uniform heating, prolong processing time and reduce sterilization efficiency; at the same time, it is easy to cause material agglomeration when applied to solid food. These challenges urgently need to be further optimized to improve the feasibility and efficiency of radio frequency sterilization technology in actual production. Summary of the invention

[0005] In order to solve the above-mentioned problems, the present invention provides a solid material fluidized radio frequency sterilization device and method, and the technical solution is as follows:

[0006] As one aspect of the present invention, a solid material fluidized radio frequency sterilization device is provided.

[0007] It includes: a material fluidization system, a radio frequency processing system and a supply and exhaust air circulation system. The radio frequency processing system is arranged above the material fluidization system and is connected with the material fluidization system to perform radio frequency sterilization on the fluidized solid material. The radio frequency processing system includes a solid-gas separation device and a radio frequency processing chamber. The solid-gas separation device is arranged above the radio frequency processing chamber. The supply and exhaust air circulation system includes an air inlet device, an exhaust device and a circulating air duct. The gas storage chamber is used to store inert gas.

[0008] One end of the air inlet device is connected to the gas storage chamber and one end of the circulating air duct respectively, and the other end of the air inlet device is connected to the air inlet of the material fluidization system to fluidize the solid material. One end of the exhaust device is connected to the clean air outlet of the solid-gas separation device through a safety valve, and the other end of the exhaust device is connected to the other end of the circulating air duct and connected to the air through the exhaust damper.

[0009] Furthermore, the material fluidization system includes a paddle screw agitator, which includes a screw ribbon, a stirring shaft and a screw ribbon bracket. The screw ribbon is fixed to the stirring shaft through the screw ribbon bracket. The stirring shaft is hollow and connected to the air inlet device. A plurality of air outlet holes are provided on the stirring shaft. A material discharge structure is provided at the bottom center of the material fluidization system.

[0010] Furthermore, the spiral ribbon is a forward and reverse rotating spiral ribbon.

[0011] Furthermore, the RF processing system is provided with a plurality of parallel RF plates, which are alternately arranged with positive and negative electrodes. The RF plates on both sides close to the outer wall are negative electrodes. The RF plates are fixed in the RF processing system through insulating material brackets, and a RF processing cavity is formed between the RF plates.

[0012] Furthermore, a plurality of small holes are evenly arranged on the radio frequency plate.

[0013] Furthermore, the solid-gas separation device includes but is not limited to a pulse processor and a dust removal bag, and the pulse processor is arranged directly above the suspension bridge of the dust removal bag.

[0014] Furthermore, the air intake device includes an air intake duct, in which an air intake damper, a gas filter and a blower are arranged in sequence along the air flow transmission direction. The gas filter is arranged at the inlet of the blower, and the outlet of the blower is connected to the air inlet of the material fluidization system through the air intake duct. The connection between the circulating air duct and the air intake duct is located between the air intake damper and the gas filter.

[0015] Furthermore, the exhaust device includes an exhaust duct, and the exhaust duct is sequentially provided with a safety valve, a silencer, an induced draft fan and an exhaust damper along the gas transmission direction, and the connection between the circulating air duct and the exhaust duct is located between the exhaust damper and the induced draft fan.

[0016] As another aspect of the present invention, a method for fluidized radio frequency sterilization of solid materials is provided, which is applied to the above-mentioned fluidized radio frequency sterilization equipment for solid materials, comprising:

[0017] The solid material therein is made to move axially through the material fluidization system, and the gas is introduced through the air inlet device and ejected from the air outlet of the stirring shaft, so that the solid material enters the radio frequency processing system and presents a fluid state, wherein the gas can be air or an inert gas in the gas storage chamber;

[0018] The solid material in a fluid state is sterilized by the radio frequency energy generated between the radio frequency processing chambers in the radio frequency processing system;

[0019] The sterilized solid material and gas are separated by a solid-gas separation device, and the gas is discharged through an exhaust device to obtain the sterilized solid material. The discharged gas can be directly discharged into the atmosphere, or enter the air inlet duct again through the circulating air duct.

[0020] Beneficial effects of the present invention:

[0021] The present invention uses a material fluidization system to make the solid material uniformly suspended in the radio frequency processing cavity and present a fluid state, thereby increasing the contact area between the radio frequency energy and the solid material, promoting heat transfer and uniformity, improving the sterilization efficiency, and being able to achieve sterilization in a relatively short time, thereby avoiding the destruction of the nutritional components of the solid material by excessively long heating time, and protecting the natural flavor and functional components of the food. In addition, radio frequency sterilization can maintain the uniformity of the temperature inside and outside the powdered food, avoiding crusting, and the effect of uniform distribution of the powdered food brought by the material fluidization system, so that the moisture contained in the powdered food can evaporate quickly during the radio frequency sterilization process, accelerating the drying speed, improving the drying efficiency, and effectively preventing overheating and hardening. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0023] Figure 1 It is a structural schematic diagram of a solid material fluidized radio frequency sterilization device provided by an embodiment of the present invention;

[0024] Figure 2 It is a left view of a material fluidization system and a radio frequency processing system provided by an embodiment of the present invention;

[0025] Figure 3 It is a structural schematic diagram of a material fluidization system and a radio frequency processing system provided in an embodiment of the present invention;

[0026] Figure 4 is another left view of the material fluidization system and the radio frequency processing system provided by the embodiment of the present invention;

[0027] Figure 5 is a front view of a material fluidization system and a radio frequency processing system provided by an embodiment of the present invention;

[0028] Figure 6 is a bottom view of a material fluidization system provided by an embodiment of the present invention;

[0029] Figure 7 It is a structural diagram of a paddle-type spiral agitator provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clear, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0031] Embodiment 1:

[0032] The present invention provides a solid material fluidized radio frequency sterilization device, see Figures 1 to 6 , including: a material fluidization system 1, a radio frequency processing system 2 and a supply and exhaust air circulation system, the radio frequency processing system 2 is arranged above the material fluidization system 1 and is connected to the material fluidization system 1 to perform radio frequency sterilization on the fluidized solid material, the radio frequency processing system 2 includes a solid-gas separation device 21 and a radio frequency processing chamber 22, the solid-gas separation device 21 is arranged above the radio frequency processing chamber 22, the supply and exhaust air circulation system includes an air inlet device 3, an exhaust device 4 and a circulating air duct 5, and a gas storage chamber 6 is used to store inert gas, and the gas storage chamber 6 can be a gas bottle;

[0033] One end of the air inlet device 3 is connected to the gas storage chamber 6 and one end of the circulating air duct 5, such as nitrogen and carbon dioxide, respectively. The other end of the air inlet device 3 is connected to the air inlet 11 of the material fluidization system 1 to fluidize the solid material. One end of the exhaust device 4 is connected to the clean air outlet 213 of the solid-gas separation device 21 through a safety valve 41. The other end of the exhaust device 4 is connected to the other end of the circulating air duct 5 and the end of the exhaust device 4 is also connected to the air through an exhaust damper 42. When the pressure of the dust environment is higher than 0.8Mpa, a dust cloud will be formed, which is prone to explosion. Therefore, the safety valve 41 is used to appropriately release the pressure so that the food powder will not explode within 1.2Mpa, thereby ensuring the safety of the solid material fluidization radio frequency sterilization equipment. In addition, a gas valve is also provided on the connecting pipe between the gas storage chamber 6 and the air inlet device 3, and the gas output of the inert gas can be adjusted through the gas valve according to actual needs.

[0034] Specifically, the air intake device 3 includes an air intake duct 32, and the air intake duct 32 is sequentially provided with an air intake damper 31, a gas filter 33 and a blower 34 along the air flow transmission direction. The gas filter 33 is arranged at the inlet of the blower 34, and the outlet of the blower 34 is connected to the air inlet 11 of the material fluidization system 1 through the air intake duct 32. The connection between the circulating air duct 5 and the air intake duct 32 is located between the air intake damper 31 and the gas filter 33.

[0035] The gas filter 33 can filter and purify the gas such as the inert gas before it enters the blower 34, thereby ensuring the cleanliness of the gas entering the material fluidization system 1, thereby avoiding contamination of the solid material and reducing environmental pollution after the gas is discharged.

[0036] Furthermore, if Figure 7 As shown, the material fluidization system 1 includes a paddle-type spiral agitator 12, which includes a spiral ribbon 121, a stirring shaft 122 and a spiral ribbon bracket 123. The spiral ribbon 121 is fixed to the stirring shaft 122 through the spiral ribbon bracket 123. The stirring shaft 122 is hollow and connected to the air inlet device 3. A plurality of air outlet holes 124 are provided on the stirring shaft 122. A material discharge structure 13 is provided at the bottom center of the material fluidization system 1. In the embodiment of the present invention, the spiral ribbon is specifically a forward and reverse rotating spiral ribbon.

[0037] The water content of the solid material targeted by the embodiment of the present invention is mainly between 5% and 15%. In the specific implementation, the motor 14 drives the stirring shaft 122 to rotate, driving the forward and reverse rotating spiral belt to rotate so that the solid material moves axially. At the same time, the gas passes through the gas filter 33 and the blower 34, and is sent into the hollow cavity of the stirring shaft 122 through the air inlet 11 through the pipeline, and is ejected from the air outlet 124 on the stirring shaft 122, so that the solid material is evenly suspended in the radio frequency processing cavity 22 to present a fluid state, thereby increasing the contact area between the radio frequency energy and the solid material, promoting heat transfer, and improving the sterilization efficiency. At the same time, the forward and reverse rotating spiral belt can timely make the material that falls into the bottom of the paddle spiral stirrer move axially during the rotation process, and blow it up again through the wind blown out of the air outlet 124, so that it is evenly suspended in the radio frequency processing cavity for radio frequency sterilization, so as to further ensure the sterilization effect. In addition, the outlet angle of the air outlet hole 124 can be set according to actual needs, such as the height or width of the RF processing chamber, to further improve the uniformity of the distribution of the powdered food in the RF processing chamber.

[0038] Specifically, Figure 6 As shown, the unloading structure 13 includes a switch 131, a main bearing 132 and a unloading door 133. The processed solid material is unloaded through the unloading structure. During unloading, the fan device is closed, the switch 131 is turned on to drive the main bearing shaft 132 to move, the unloading door 133 is opened, and the forward and reverse rotating spiral belt of the paddle spiral agitator 12 is used to push the powder material toward the middle unloading door 133, so that the processed solid material can be discharged efficiently and orderly.

[0039] RF processing system 2 Figures 1 to 4As shown, it includes at least five layers of parallel RF plates 221, and the RF plates 221 are alternately arranged in positive and negative directions. The RF plates 221 on both sides close to the outer wall are relatively arranged negative plates to ensure RF safety. The RF plates 221 are fixed in the RF processing system 2 through insulating material brackets, and the insulating material brackets can be tetrafluoroethylene brackets. RF processing chambers 22 are formed between the RF plates 221 to sterilize solid materials. In addition, the RF processing system 2 is also provided with an observation port 23 at the RF processing chamber 22 to facilitate daily maintenance and inspection of the RF plates 221.

[0040] The solid-gas ratio in the RF treatment system 2 is usually set to 1-10 kg / m 3 The specific value can be further set according to the actual situation such as the height of the RF plate 221 and the type of solid material. The setting of this value should be based on the standard of being able to spray the powdered food to the top of the RF processing chamber 22 at the highest.

[0041] After the solid material passes through the paddle spiral agitator 12 and turns upward with the air flow into the RF processing chamber 22 of the RF processing system 2, it is heated and sterilized. The RF generator forms an electric field between the two plates. The RF output power can be 13.56MHz, 27.12MHz, and 40.68MHz, so as to adjust the RF output power and the plate spacing according to the dielectric constant of different solid materials. The common powdered food dielectric constant is 2.10~19.72. Therefore, according to the penetration depth formula, the penetration depth is 6.57~62.15m, and the adjustable spacing of the RF plates can be set to 0.15~0.2m, which can effectively sterilize the solid food in the cavity.

[0042] Since the solid material is fluidized by the material fluidization system 1, it can be evenly suspended between the radio frequency processing chambers in a fluid state, so the electromagnetic field can act evenly on the powder food, evenly heat it, and increase the contact area between the radio frequency energy and the solid material, promote heat transfer, improve the sterilization efficiency, and achieve sterilization in a relatively short time, avoiding the destruction of the nutritional components of the solid material by too long heating time, and protecting the natural flavor and functional components of the food. In addition, radio frequency sterilization can maintain the uniformity of the temperature inside and outside the powder food, avoid crusting, and combine the effect of uniform distribution of powder food brought by the forward and reverse rotating spiral belt and the gas ejected from the air outlet, so that the water contained in the powder food can evaporate quickly during the radio frequency sterilization process, accelerate the drying speed, improve the drying efficiency, and effectively prevent overheating and hardening. In another embodiment, a plurality of small holes are evenly opened on the radio frequency plate 221, and the solid material can flow between different radio frequency processing chambers 22 through the small holes opened on the radio frequency plate 221, further increasing the uniformity of fluidization and radio frequency treatment of the solid material.

[0043] The solid-gas separation device 21 in the radio frequency processing system 2 is as follows Figures 1 to 5 As shown, the RF processing system 2 includes a pulse processor 211 and a dust bag 212 for preventing dust leakage. The pulse processor 211 is arranged directly above the suspension bridge of the dust bag 212. In the embodiment of the present invention, the number of the pulse processors 211 is at least 4, and the number of the dust bag 212 is at least 20 groups, which is specifically set to 20 to 30 groups in the embodiment of the present invention. In addition, the RF processing system 2 is also provided with a clean gas outlet 213, a blowpipe 214, a venturi 215 and an inspection door 216. The arrangement of the inspection door 216 can facilitate daily maintenance and inspection of the RF plate.

[0044] After radio frequency sterilization, the solid material further enters the solid-gas separation device 21 with the turning of the air flow. The solid material accumulates on the outer surface of the dust bag 212, and the gas is discharged through the clean air outlet 213. The pulse processor 211 performs pulse cleaning on the dust bag 212, which can effectively clear the layers and avoid the solid material from attaching after leaving the surface of the dust bag 212 and avoid dust leakage, so that the dust bag 212 can completely clean the solid material and complete the solid-gas separation.

[0045] The exhaust device 4 includes an exhaust duct 43, and the exhaust duct 43 is sequentially provided with a safety valve 41, a muffler 45, an induced draft fan 44 and an exhaust damper 42 along the gas transmission direction. The connection between the circulating air duct 5 and the exhaust duct 43 is located between the exhaust damper 42 and the induced draft fan 44. The filtered gas discharged from the clean gas outlet 213 is discharged to the atmosphere through the muffler 45 and the induced draft fan 44 or recycled through the circulating air duct 5. The muffler 45 is used to reduce or eliminate the sound generated by the noise source, helping to improve the working environment and equipment noise pollution. The induced draft fan 44 and the blower 34 are started at the same time to reduce energy consumption, promote rapid circulation of gas, and improve the operation efficiency of the equipment.

[0046] In an embodiment of the present invention, the reflux ratio of the gas through the circulating air duct 5 is generally between 0.1 and 0.4, and can be set according to actual needs. For example, in an embodiment of the present invention, 10% of the gas is discharged to the atmosphere through the exhaust damper 42, and 90% of the gas enters the gas filter 33 through the circulating air duct 5 and is filtered again before flowing back to the air inlet device 3, which can not only effectively save energy but also avoid secondary pollution.

[0047] In summary, the actual working process of the solid material fluidized radio frequency sterilization equipment provided by the embodiment of the present invention is as follows:

[0048] First, air or inert gas or a mixture of inert gas and air passes through a gas filter 33 and enters a blower 34. The gas in the blower 34 enters the hollow cavity of the stirring shaft 122 through the air inlet 11 of the material fluidization system 1. The paddle spiral agitator 12 drives the forward and reverse rotating spiral belt on the stirring shaft 122 through the motor 14 to make the solid material move axially. At the same time, the gas is ejected from the hollow cavity of the stirring shaft 122 through the air outlet 124 on the stirring shaft 122, so that the solid material enters the RF processing cavity 21 in the RF processing system 2 upward with the air flow and presents a fluid state. Sterilization treatment is carried out in the radio frequency treatment chamber 21, and the sterilized solid material is intercepted by the pulse processor 211 and the dust bag 212 and falls into the bottom of the material fluidization system 1. At this time, the air inlet device 3 is closed, and the stirring shaft 122 keeps running, driving the solid material to concentrate at the middle unloading structure. The solid material collection is completed after the main bearing shaft 132 is driven by the switch 131 to open the unloading door 133, and the gas is discharged through the clean air outlet 213 of the upper barrel of the fluidized radio frequency device through the muffler 45 and the induced draft fan 44. The exhausted gas can be directly discharged into the atmosphere, or enter the air inlet duct 32 again through the circulating air duct 5.

[0049] Embodiment 2:

[0050] Another embodiment of the present invention provides a fluidized radio frequency sterilization method for solid materials, which is applied to the above-mentioned fluidized radio frequency sterilization device, comprising:

[0051] S100, the solid material therein is moved axially by a material fluidization system, and gas is introduced through an air inlet device and ejected from the air outlet of the stirring shaft, so that the solid material enters the radio frequency processing system and presents a fluid state, wherein the gas can be air or an inert gas in a gas storage chamber;

[0052] S200, sterilizing the fluid solid material by using the radio frequency energy generated between the radio frequency processing chambers in the radio frequency processing system;

[0053] S300, the sterilized solid material and gas are separated by a solid-gas separation device, and the gas is discharged through an exhaust device to obtain the sterilized solid material. The discharged gas can be directly discharged into the atmosphere, or enter the air inlet duct again through the circulating air duct.

[0054] The solid material fluidized radio frequency sterilization method provided by the embodiment of the present invention uses the forward and reverse rotating spiral ribbons in the paddle spiral agitator to make the solid material move axially, and at the same time, the gas is ejected from the air outlet on the stirring shaft, so that the solid material is evenly suspended in the radio frequency processing cavity and presents a fluid state, increasing the contact area between the radio frequency energy and the solid material, promoting heat transfer, and improving the sterilization efficiency. Sterilization can be achieved in a relatively short time, avoiding the destruction of the nutritional components of the solid material by too long heating time, and protecting the natural flavor and functional components of the food. In addition, radio frequency sterilization can maintain the uniformity of the temperature inside and outside the powder food, avoid crusting, and combine the effect of uniform distribution of the powder food brought by the forward and reverse rotating spiral ribbons and the gas ejected from the air outlet, so that the moisture contained in the powder food can evaporate quickly during the radio frequency sterilization process, accelerate the drying speed, improve the drying efficiency, and effectively prevent overheating and hardening. Some steps in the embodiment of the present invention can be implemented by software, and the corresponding software program can be stored in a readable storage medium, such as a CD or a hard disk.

[0055] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A solid material fluidized radio frequency sterilization device, characterized in that: include: A material fluidization system, a radio frequency processing system and an air supply and exhaust circulation system, wherein the radio frequency processing system is arranged above the material fluidization system and is connected to the material fluidization system to perform radio frequency sterilization on the fluidized solid material, the radio frequency processing system comprises a solid-gas separation device and a radio frequency processing chamber, the solid-gas separation device is arranged above the radio frequency processing chamber, the air supply and exhaust circulation system comprises an air inlet device, an air exhaust device and a circulating air duct, and the gas storage chamber is used to store inert gas; One end of the air inlet device is respectively connected to the gas storage chamber and one end of the circulating air duct, the other end of the air inlet device is connected to the air inlet of the material fluidization system to fluidize the solid material, one end of the exhaust device is connected to the clean air outlet of the solid-gas separation device through a safety valve, and the other end of the exhaust device is connected to the other end of the circulating air duct and connected to the air through the exhaust damper.

2. The solid material fluidized radio frequency sterilization equipment according to claim 1, characterized in that: The material fluidization system includes a paddle screw agitator, which includes a screw ribbon, a stirring shaft and a screw ribbon bracket. The screw ribbon is fixed to the stirring shaft through the screw ribbon bracket. The stirring shaft is hollow and connected to the air inlet device. A plurality of air outlet holes are provided on the stirring shaft. A material discharge structure is provided at the bottom center of the material fluidization system.

3. The solid material fluidized radio frequency sterilization equipment according to claim 2, characterized in that: The spiral belt is a forward and reverse rotating spiral belt.

4. A solid material fluidized radio frequency sterilization device according to any one of claims 1 to 3, characterized in that: The RF processing system is provided with a plurality of parallel RF plates, which are alternately arranged in positive and negative directions. The RF plates on both sides close to the outer wall are negative plates. The RF plates are fixed to the RF processing system through insulating material brackets, and a RF processing cavity is formed between the RF plates.

5. The solid material fluidized radio frequency sterilization equipment according to claim 4, characterized in that: A plurality of small holes are evenly arranged on the radio frequency plate.

6. The solid material fluidized radio frequency sterilization equipment according to claim 1, characterized in that: The solid-gas separation device includes but is not limited to a pulse processor and a dust removal bag, and the pulse processor is arranged directly above the suspension bridge of the dust removal bag.

7. The solid material fluidized radio frequency sterilization equipment according to claim 1, characterized in that: The air intake device includes an air intake duct, and the air intake damper, gas filter and blower are sequentially arranged on the air intake duct along the air flow transmission direction. The gas filter is arranged at the inlet of the blower, and the outlet of the blower is connected to the air inlet of the material fluidization system through the air intake duct. The connection between the circulating air duct and the air intake duct is located between the air intake damper and the gas filter.

8. The solid material fluidized radio frequency sterilization equipment according to claim 1, characterized in that: The exhaust device comprises an exhaust duct, on which the safety valve, the silencer, the induced draft fan and the exhaust damper are sequentially arranged along the gas transmission direction, and the connection between the circulating air duct and the exhaust duct is located between the exhaust damper and the induced draft fan.

9. A method for fluidizing radio frequency sterilization of solid materials, applied to a fluidizing radio frequency sterilization device for solid materials as claimed in any one of claims 1 to 8, characterized in that: include: The solid food is moved axially by the material fluidization system, and gas is introduced through the air inlet device and ejected from the air outlet of the stirring shaft, so that the solid food enters the radio frequency processing system and presents a fluid state, wherein the gas can be air or an inert gas in the gas storage chamber; Sterilize the fluid solid food by using the radio frequency energy generated between the radio frequency processing chambers in the radio frequency processing system; The sterilized solid food and gas are separated by a solid-gas separation device, and the gas is discharged through an exhaust device to obtain the sterilized solid food. The discharged gas can be directly discharged into the atmosphere, or re-enter the air inlet duct through the circulating air duct.

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