A microwave drying rotary kiln for powdered materials and a drying method thereof

Abstract

The invention discloses a microwave drying rotary furnace for powdered materials and a drying method, wherein the microwave drying rotary furnace for powdered materials comprises a furnace shell and a furnace chamber assembly rotatably connected in the furnace shell, a furnace shell feed port is provided at one end of the furnace shell, a furnace shell discharge port is provided at the other end of the furnace shell, a furnace chamber feed port is provided on the furnace chamber assembly and located at the furnace shell feed port, a furnace chamber discharge port is provided on the furnace chamber assembly and located at the furnace shell discharge port, and a microwave feed port is provided in the middle of the furnace shell, and microwaves emitted by a microwave source enter the furnace shell through the microwave feed port. The invention can perform microwave drying on powdered materials, improve drying efficiency and drying quality, and reduce the intensity of workers' operation.

Description

Technical Field

[0001] The invention relates to a drying device and a drying method, in particular to a powdery material microwave drying rotary kiln and a drying method, belonging to the technical field of microwave drying. Background Art

[0002] Microwave is a high-frequency electromagnetic wave with a frequency of 300 MHz to 300,000 MHz and a wavelength of 1 mm to 1 m. Microwaves have the characteristics of short oscillation period, strong penetration ability, and specific effects produced by interaction with materials, which are unique to electric fields. Traditional drying methods, such as flame, hot air, steam, electric heating, etc., are all external heating drying. After the surface of the material absorbs heat, the heat penetrates into the inside of the material through heat conduction, and then the temperature rises and dries. Microwave drying is completely different. It is an internal heating method. When the wet material is in a microwave high-frequency electric field with an extremely short oscillation period, the water molecules inside it will be polarized and arranged neatly along the direction of the microwave electric field, and then quickly rotate with the interactive changes in the direction of the high-frequency alternating electric field, and produce violent collisions and friction (up to hundreds of millions of times per second). As a result, part of the microwave energy is converted into molecular kinetic energy and expressed in the form of heat, which increases the temperature of the water and leaves the material, thereby drying the material. In other words, after the microwave enters the material and is absorbed, its energy is converted into heat energy inside the dielectric of the material. Therefore, microwave drying is a drying method that uses electromagnetic waves as a heating source and the dried material itself as a heating element. my country's microwave drying technology is now used in food industry, material chemical industry, pharmaceutical industry, mineral mining industry, ceramic industry, laboratory analysis, wet natural rubber processing and other aspects.

[0003] At present, the drying of powdered materials (such as iron powder) is still done manually, and the heat source is hot air or high-temperature flue gas, etc. Therefore, there are problems such as low drying efficiency and high operating intensity of workers.

[0004] The following relevant patent documents were retrieved:

[0005] 1. A Chinese invention patent with application publication number CN 105890321A and application publication date August 24, 2016 discloses a microwave dryer dedicated to powdered materials, including a conveyor belt, a microwave drying box and a dehumidification system, wherein a dehumidification port of the dehumidification system is arranged at the top of the microwave drying box, and a dust filtering device is arranged on the dehumidification port, and the dust filtering device is a dust filter cartridge; a conveyor belt vibration device is arranged under the conveyor belt, and the conveyor belt vibration device is composed of a motor and a crankshaft driven by the motor; a hot air system is arranged at the bottom of the microwave drying box, and the hot air system is composed of a blower and an electric heating wire.

[0006] 2. A Chinese invention patent with application publication number CN 106440663A and application publication date February 22, 2017 discloses a double-helix microwave drying device for chemical powder raw materials, comprising a base, a second drying chamber is arranged on the top of the base, a second spiral stirring device is arranged inside the second drying chamber, the right side is connected to the right wall of the second drying chamber by screws, and the left side penetrates the left wall of the second drying chamber and is connected to the second driving motor; a second microwave generator and a connecting pipe are arranged on the top of the second drying chamber, and a discharge pipe is arranged on the bottom; a second motor support is arranged at the bottom of the second driving motor; the second motor support is arranged at the bottom of the second driving motor The second microwave generator is fixedly arranged on the top of the second drying chamber, and the right side is fixedly connected to the right inner wall of the second drying chamber, and an air inlet pipe is arranged on the top; the connecting pipe is arranged on the left side of the second microwave generator, and the right side is fixedly connected to the second microwave generator, and the left side is fixedly connected to the right inner wall of the second drying chamber; a flow equalizing plate is arranged on the top of the air inlet pipe; a first drying chamber is arranged on the top of the flow equalizing plate; a first spiral stirring device is arranged in the first drying chamber, and a first microwave generator and a crushing feed hopper are arranged on the top; the right side of the first spiral stirring device is connected to the first The first microwave generator is provided with two, and the first microwave generator is evenly distributed on the top of the first drying chamber; the crushing feed hopper is provided on the right side of the first microwave generator on the right side, and the crushing feed hopper is composed of a feed pipe, a discharge hopper and a discharge pipe; the feed pipe is provided with a support rod, a crushing motor, a crushing shaft, a crushing blade and an auxiliary blade, and a filter plate is provided at the bottom; the left and right ends of the support rod are connected to the left and right inner walls of the feed pipe. The crushing shaft is fixedly connected; the crushing shaft is arranged on the center line of the feed pipe, and the top is connected to the crushing motor; the crushing motor is fixedly arranged on the center line of the support rod, the first drive motor, the second drive motor and the crushing motor are all connected to the power supply through the control switch, and the crushing shaft, the crushing blade, the auxiliary blade, the first spiral stirring device and the second spiral stirring device are all provided with a wear-resistant layer, and the left and right ends of the filter plate are respectively fixedly connected to the left and right inner walls of the feed pipe; a discharge hopper is arranged at the bottom of the filter plate, and the auxiliary blade and the crushing blade are arranged crosswise, and there are two blades, which are symmetrically arranged on the left and right inner walls of the feed pipe.

[0007] 3. A Chinese invention patent with application publication number CN 106500487A and application publication date March 15, 2017 discloses a highly efficient microwave drying device for chemical powdered materials, including a drying box; a material divider, a scraper, a material propeller, a driving wheel, a driven wheel, a conveyor belt and a motor are arranged in the drying box; a discharge pipe is arranged at the bottom of the drying box, and a feeding device, a microwave generator and a dust cover are arranged at the top of the drying box; the feeding device is composed of a feeding bin, a feeding hopper, a spiral feeding device, a driving motor and a feeding port; the feeding hopper is arranged on the top right side of the feeding device; the spiral feeding device is arranged on the center line of the feeding bin, and penetrates the right wall of the feeding bin and is connected to the driving motor; the material divider is composed of a stirring motor, a connecting shaft and a dividing plate; the stirring motor is fixedly arranged on the top of the drying box, and the bottom is connected to the connecting shaft Fixed connection; the dividing plate is arranged at the bottom of the connecting shaft and is fixedly connected to the connecting shaft; the dust hood and the material divider are arranged crosswise, connected to the dust removal bin through a connecting pipe, and a microwave generator is arranged in the dust hood; a dust suction pump is arranged on the top of the dust removal bin; the dust suction pump is fixedly connected to the center line of the dust removal bin through an auxiliary pipeline; the microwave generator is arranged at the center of the dust hood; the motor is arranged on the right side of the drying box and connected to the driving wheel through a connecting shaft; the driving wheel is connected to the driven wheel through a conveyor belt; the driven wheel is arranged on the left side of the driving wheel; the material pusher is arranged at the bottom of the conveyor belt and the top of the bottom plate of the drying box; the material pusher is composed of a hydraulic generator, a telescopic rod and a push plate; the telescopic rod is fixedly arranged on the left side of the hydraulic generator; the push plate is fixedly arranged on the left side of the telescopic rod.

[0008] The principle and structure of the drying device in the above patent documents are different from those of the present application.

[0009] In summary, how to design a microwave drying rotary kiln and drying method for powdered materials so that it can perform microwave drying on powdered materials, improve drying efficiency and drying quality, and reduce the intensity of workers' operation is a technical problem that needs to be solved urgently. Summary of the invention

[0010] The technical problem to be solved by the present invention is to provide a powder material microwave drying rotary kiln and a drying method in view of the defects existing in the prior art, which can perform microwave drying on powder materials, improve drying efficiency and drying quality, and reduce the intensity of workers' operation.

[0011] In order to solve the above technical problems, the technical solution adopted by the present invention is: a powdered material microwave drying rotary furnace, which includes a furnace shell and a furnace chamber combination rotatably connected to the furnace shell, a furnace shell feed port is opened at one end of the furnace shell, a furnace shell discharge port is opened at the other end of the furnace shell, a furnace chamber feed port is opened on the furnace chamber combination and located at the furnace shell feed port, a furnace chamber discharge port is opened on the furnace chamber combination and located at the furnace shell discharge port, and a microwave feed port is also opened in the middle of the furnace shell, and the microwaves emitted by the microwave source enter the furnace shell through the microwave feed port.

[0012] Preferably, rotating shaft one and rotating shaft two are respectively provided on the opposite end surfaces of the furnace combination, rotating shaft one and rotating shaft two respectively pass through the two end surfaces of the furnace shell and are rotatably connected to the furnace shell, rotating shaft two is hollow, and the internal cavity of the furnace combination is connected to the external space through the hollow rotating shaft two.

[0013] Preferably, the rotating shaft 1 is also configured to be hollow, and the internal cavity of the furnace assembly is connected to the gas source through the hollow rotating shaft 1.

[0014] Preferably, a combustion port is provided at the bottom of the furnace shell, and the second rotating shaft is connected to the combustion port through a pipeline.

[0015] Preferably, the furnace combination includes a furnace end cover one, a furnace end cover two and a furnace arranged between the furnace end cover one and the furnace end cover two, and the furnace is made of wave-transmitting material; a rotating shaft one is arranged on the end of the furnace end cover one, a rotating shaft two is arranged on the end of the furnace end cover two, a furnace feed port is arranged on the circumferential surface of the furnace end cover one, and a furnace discharge port is arranged on the circumferential surface of the furnace end cover two.

[0016] Preferably, a scraping hopper is provided on the peripheral surface of the furnace end cover and located at the furnace feed port.

[0017] Preferably, partition 1 and partition 2 are respectively provided at the two ends of the interior of the furnace shell, and partition 1 and partition 2 divide the internal space of the furnace shell into a feeding area and a discharging area at the two ends and a drying area located in the middle part. Furnace end cover 1 and furnace end cover 2 are respectively located in the feeding area and the discharging area, and the furnace is located in the drying area.

[0018] Preferably, a pressing rod is further provided inside the furnace along the axial direction of the furnace; when the furnace rotates, the pressing rod can relatively rotate inside the furnace along the circumferential direction of the furnace.

[0019] Preferably, the furnace shell is a regular pentagonal furnace shell, a bottom plate of the regular pentagonal furnace shell is arranged in a horizontal state, and the microwave feed port is arranged on the bottom plate in the horizontal state.

[0020] The present invention also discloses a drying method of the powder material microwave drying rotary furnace as described above, wherein the furnace shell and the furnace chamber combination are arranged at an angle, and after the furnace chamber combination is controlled to rotate in the furnace shell, the powder material is sequentially fed into the furnace chamber combination through the furnace shell feed port and the furnace chamber feed port, and the microwave emitted by the microwave source is controlled to enter the furnace shell through the microwave feed port to dry the powder material in the furnace chamber combination, and the dried powder material is sequentially discharged through the furnace chamber discharge port and the furnace shell discharge port.

[0021] The beneficial effects of the present invention are as follows: the present invention can perform microwave drying on powdered materials through structural design, improve drying efficiency and drying quality, and reduce the intensity of workers' operation. The rotating shaft 1 and the rotating shaft 2 are set to be hollow. During the drying process, the protective gas source is continuously introduced into the furnace combination through the hollow rotating shaft 1, which can ensure the working atmosphere, thereby improving the quality of drying. By setting a combustion port at the bottom of the furnace shell, the rotating shaft 2 is connected to the combustion port through a pipeline. In this way, on the one hand, the furnace combination can be auxiliary heated by the combustion of reducing gas, thereby further improving the drying efficiency; on the other hand, the reducing gas is prevented from being directly discharged into the external space, which is very environmentally friendly. By setting a scraping hopper, more powdered materials can be sent into the furnace combination. By dividing the furnace shell into different areas, the powdered materials can be dried well. By using the pressure rod and the furnace to cooperate with each other, the agglomerated powdered materials can be crushed, thereby further improving the drying efficiency and drying quality. The furnace shell is set to a regular pentagon so that the microwave breach is directly opposite to a corner below the furnace shell, thereby ensuring that the incident angle and reflection angle of the microwave entering through the microwave breach inside the furnace shell will not overlap, reducing the phenomenon of microwaves canceling each other out and improving the working efficiency of the microwaves. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the three-dimensional structure of an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the three-dimensional structure of an embodiment of the present invention without the furnace door;

[0024] Figure 3 for Figure 5 Schematic diagram of the cross-sectional structure along the DD line;

[0025] Figure 4 A schematic diagram of the three-dimensional structure of a furnace assembly in an embodiment of the present invention;

[0026] Figure 5 It is a schematic diagram of the main structure of an embodiment of the present invention;

[0027] In the figure: 1. furnace shell, 2. furnace chamber assembly, 211. furnace chamber end cover 1, 212. furnace chamber end cover 2, 213. furnace, 3. furnace shell feeding port, 4. furnace shell discharging port, 5. furnace chamber feeding port, 6. furnace chamber discharging port, 7. microwave feeding port, 8. rotating shaft 1, 9. rotating shaft 2, 10. combustion port, 11. scraper hopper, 12. partition 1, 13. partition 2, 14. pressing rod, 15. furnace door, 16. material guide cone, A. feeding area, B. discharging area, C. drying area. DETAILED DESCRIPTION

[0028] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0029] Example: Figures 1 to 4 As shown, a microwave drying rotary furnace for powdered materials comprises a furnace shell 1 and a furnace chamber assembly 2 rotatably connected in the furnace shell 1, a furnace shell feed port 3 is provided at one end of the furnace shell 1, a furnace shell discharge port 4 is provided at the other end of the furnace shell 1, a furnace chamber feed port 5 is provided on the furnace chamber assembly 2 and located at the furnace shell feed port 3, a furnace chamber discharge port 6 is provided on the furnace chamber assembly 2 and located at the furnace shell discharge port 4, and a microwave feed port 7 is also provided in the middle of the furnace shell 1, and the microwaves emitted by the microwave source enter the furnace shell 1 through the microwave feed port 7. This embodiment can perform microwave drying on powdered materials through the above structural design, improve the drying efficiency and drying quality, and reduce the intensity of workers' operation. In this embodiment, the furnace shell 1 and the furnace chamber assembly 2 are both inclined, and the feed port position is higher than the discharge port position. The specific inclination angle should be set according to actual working conditions such as the discharge speed and the drying speed. The furnace shell material inlet 3 is arranged on the top of the furnace shell 1, the furnace shell material outlet 4 is arranged on the bottom of the furnace shell 1, and a plurality of microwave feed ports 7 are arranged along the length direction of the furnace shell 1. The furnace shell 1 can be made of stainless steel.

[0030] like Figure 3 As shown, a rotating shaft 1 8 and a rotating shaft 2 9 are respectively arranged on the opposite end surfaces of the furnace assembly 2. The rotating shaft 1 8 and the rotating shaft 2 9 respectively pass through the two end surfaces of the furnace shell 1 and are rotatably connected to the furnace shell 1 through bearings (not shown in the figure). The rotating shaft 2 9 is hollow, and the internal cavity of the furnace assembly 2 is connected to the external space through the hollow rotating shaft 2 9. The rotating shaft 1 8 or the rotating shaft 2 9 is connected to a power source (such as a motor), so that the furnace assembly 2 is driven by the power source.

[0031] Can rotate in the furnace shell 1.

[0032] The rotating shaft 1 is also configured to be hollow, and the internal cavity of the furnace assembly is connected to the gas source through the hollow rotating shaft 1. During the drying process, the protective gas source is continuously introduced into the furnace assembly through the hollow rotating shaft 1 to ensure the working atmosphere, thereby improving the drying quality. For example, when the powdery material is iron powder, the reducing gas is introduced into the furnace assembly to ensure the reducing atmosphere in the furnace assembly, thereby improving the drying quality of the product.

[0033] A combustion port 10 is provided at the bottom of the furnace shell 1, and the rotating shaft 2 9 is connected to the combustion port 10 through a pipeline (not shown in the figure). An ignition device (not shown in the figure) is also provided at the combustion port 10. The reducing gas fed into the furnace assembly through the rotating shaft 1 is fed into the furnace shell again through the rotating shaft 2, the pipeline and the combustion port in sequence to be ignited and burned. In this way, on the one hand, the reducing gas combustion can be used to assist in heating the furnace assembly, further improving the drying efficiency; on the other hand, it also avoids the reducing gas from being directly discharged into the external space, which is very environmentally friendly.

[0034] like Figure 3 and Figure 4 As shown, the furnace assembly 2 is cylindrical, and the furnace assembly 2 includes a furnace end cover 1 211, a furnace end cover 212, and a furnace 213 disposed between the furnace end cover 1 211 and the furnace end cover 212, and the furnace 213 is made of a wave-transmitting material (such as quartz glass); the rotating shaft 1 8 is disposed on the end of the furnace end cover 1 211, the rotating shaft 2 9 is disposed on the end of the furnace end cover 212, the furnace feed port 5 is disposed on the circumferential surface of the furnace end cover 1 211, and the furnace discharge port 6 is disposed on the circumferential surface of the furnace end cover 212. There are multiple furnace feed ports 5 and furnace discharge ports 6, and the multiple furnace feed ports 5 and furnace discharge ports 6 are disposed on the furnace end cover 1 211 and the furnace end cover 212 along the circumferential direction, respectively, and the furnace end cover 1 211 and the furnace end cover 212 can be made of stainless steel.

[0035] A scraper 11 is provided on the circumference of the furnace end cover 211 and at each furnace feed port 5. The opening of the scraper 11 faces the feeding direction. During drying, as the furnace assembly rotates, more powdered materials can be fed into the furnace assembly by the scraper 11.

[0036] A hollow material guide cone 16 is also provided on the inner end surface of the furnace end cover 211. The large end of the material guide cone 16 contacts the inner end surface of the furnace end cover 211, and the small end of the material guide cone 16 points to the furnace. The furnace feed port 5 is located above the side circumference of the material guide cone 16, so that the powdered material entering from the furnace feed port 5 falls onto the side circumference of the material guide cone 16, and then the material guide cone 16 guides the material to flow into the furnace for drying. By adding a material guide cone, the drying efficiency and quality can be further improved.

[0037] like Figure 2and Figure 3 As shown, a partition 12 and a partition 2 13 are respectively arranged at both ends of the furnace shell 1, and the partition 1 12 and the partition 2 13 divide the internal space of the furnace shell into a feeding area A located at both ends, a discharging area B and a drying area C located in the middle, a furnace end cover 1 211 and a furnace end cover 212 are respectively located in the feeding area A and the discharging area B, and the furnace 213 is located in the drying area C. By dividing the furnace shell into different areas, the powdered material can be dried well.

[0038] A pressing rod 14 is provided inside the furnace 213 along the axial direction of the furnace 213. The pressing rod 14 can be made of corundum material. When the furnace 213 rotates, the pressing rod 14 can rotate relatively inside the furnace 213 along the circumference of the furnace 213. The pressing rod and the furnace cooperate with each other to crush the agglomerated powdery materials, further improving the drying efficiency and drying quality.

[0039] like Figure 2 and Figure 5 As shown, the furnace shell 1 is a regular pentagonal furnace shell 1, a bottom plate of the regular pentagonal furnace shell 1 is horizontally arranged at an upper position, the microwave feed port 7 is arranged on the horizontal bottom plate, and the furnace shell feed port 3 is also arranged on the horizontal bottom plate. This arrangement makes the microwave breach directly face a corner below the furnace shell, thereby ensuring that the incident angle and reflection angle of the microwave entering the microwave breach inside the furnace shell will not overlap, reducing the phenomenon of microwave mutual cancellation and improving the working efficiency of the microwave.

[0040] like Figure 1 As shown, a furnace door 15 is provided on a side plate of the regular pentagonal furnace shell 1. When performing inspection and maintenance, the furnace door can be opened to conveniently perform maintenance operations on the interior of the furnace shell.

[0041] like Figure 2 and Figure 3 As shown, the present invention also discloses a drying method of a powder material microwave drying rotary furnace according to the above-mentioned method, wherein the furnace shell 1 and the furnace chamber combination 2 are tilted, and after the furnace chamber combination 2 is controlled to rotate in the furnace shell 1, the powder material is sequentially fed into the furnace chamber combination 2 through the furnace shell feed port 3 and the furnace chamber feed port 5, and the microwave emitted by the microwave source is controlled to enter the furnace shell 1 through the microwave feed port 7 to dry the powder material in the furnace chamber combination, and the dried powder material is sequentially discharged through the furnace chamber discharge port 6 and the furnace shell discharge port 4.

[0042] In summary, the present invention can perform microwave drying on powdered materials through structural design, improve drying efficiency and drying quality, and reduce the intensity of workers' operation. The rotating shaft one and the rotating shaft two are set to be hollow. During the drying process, the protective gas source is continuously introduced into the furnace combination through the hollow rotating shaft one, which can ensure the working atmosphere and improve the quality of drying. By setting a combustion port at the bottom of the furnace shell, the rotating shaft two is connected to the combustion port through a pipeline. In this way, on the one hand, the furnace combination can be auxiliary heated by the combustion of reducing gas, thereby further improving the drying efficiency; on the other hand, the reducing gas is avoided from being directly discharged into the external space, which is very environmentally friendly. By setting a scraper hopper, more powdered materials can be delivered into the furnace combination. By dividing the furnace shell into different areas, the powdered materials can be dried well. By using the pressure rod and the furnace to cooperate with each other, the agglomerated powdered materials can be crushed, thereby further improving the drying efficiency and drying quality. The furnace shell is set to a regular pentagon so that the microwave breach is directly opposite to a corner below the furnace shell, thereby ensuring that the incident angle and reflection angle of the microwave entering through the microwave breach inside the furnace shell will not overlap, reducing the phenomenon of microwaves canceling each other out and improving the working efficiency of the microwaves.

[0043] The "multiple" mentioned in the above embodiments refers to the number of "two or more". The above embodiments are only used to illustrate the present invention, but not to limit the present invention. Those skilled in the relevant technical field can make various changes or modifications without departing from the spirit and scope of the present invention. Therefore, all equivalent technical solutions should also belong to the protection scope of the present invention, and the protection scope of the present invention should be defined by the claims.

Claims

1. A powdery material microwave drying rotary kiln, characterized in that: It comprises a furnace shell and a furnace chamber assembly rotatably connected in the furnace shell, a furnace shell feed port is provided at one end of the furnace shell, a furnace shell discharge port is provided at the other end of the furnace shell, a furnace chamber feed port is provided on the furnace chamber assembly and located at the furnace shell feed port, a furnace chamber discharge port is provided on the furnace chamber assembly and located at the furnace shell discharge port, and a microwave feed port is provided in the middle of the furnace shell, and microwaves emitted by a microwave source enter the furnace shell through the microwave feed port; A first rotating shaft and a second rotating shaft are respectively arranged on opposite end surfaces of the furnace assembly, the first rotating shaft and the second rotating shaft respectively pass through the two end surfaces of the furnace shell and are rotatably connected with the furnace shell, the second rotating shaft is hollow, and the internal cavity of the furnace assembly is connected to the external space through the hollow second rotating shaft; The rotating shaft 1 is also configured to be hollow, and the internal cavity of the furnace assembly is connected to the gas source of the reducing gas through the hollow rotating shaft 1; A combustion port is provided at the bottom of the furnace shell, and the second rotating shaft is connected to the combustion port through a pipeline; The furnace assembly comprises a furnace end cover 1, a furnace end cover 2 and a furnace arranged between the furnace end cover 1 and the furnace end cover 2, and the furnace is made of wave-transmitting material; the rotating shaft 1 is arranged on the end of the furnace end cover 1, the rotating shaft 2 is arranged on the end of the furnace end cover 2, the furnace feed port is arranged on the circumferential surface of the furnace end cover 1, and the furnace discharge port is arranged on the circumferential surface of the furnace end cover 2; Partition 1 and partition 2 are respectively arranged at the two ends of the furnace shell, and partition 1 and partition 2 divide the internal space of the furnace shell into a feeding area and a discharging area at the two ends and a drying area in the middle. The first end cover of the furnace and the second end cover of the furnace are respectively located in the feeding area and the discharging area, and the furnace is located in the drying area. The furnace shell is a regular pentagonal furnace shell, a bottom plate of the regular pentagonal furnace shell is arranged in a horizontal state, and the microwave feed port is arranged on a bottom plate in the horizontal state.

2. The powdery material microwave drying rotary kiln according to claim 1, characterized in that: A scraping hopper is arranged on the peripheral surface of the furnace end cover and located at the furnace feed port.

3. The powdery material microwave drying rotary kiln according to claim 1, characterized in that: A pressing rod is also arranged inside the furnace along the axial direction of the furnace; when the furnace rotates, the pressing rod can rotate relatively inside the furnace along the circumferential direction of the furnace.

Images