A dry feeding device

Abstract

The embodiment of the present invention provides a drying feeding device. The device includes a feeding system, a spiral feeding system, a microwave heating system and a water vapor guiding system. The spiral feeding system includes a spiral tube, which is divided into a feeding area, a first sealing area, a drying area, a second sealing area and a discharging area, and a continuous spiral blade is arranged on the rotating shaft in each area. After the material enters the spiral tube, it is stirred and pushed by the spiral blade, passes through the first sealing area and enters the drying area, and is continuously heated by the microwave heating system and heated and dehydrated by the spiral blade, and expanded and loosened; the water vapor in the drying area is automatically discharged after purification through the water vapor guiding system to maintain the safety pressure in the device; the dehydrated material is sent into the reaction chamber after passing through the second sealing area and the discharging area, and subsequent reactions occur. The device has uniform heating, energy saving, pressure resistance, fast control response, strong adaptability, and high space utilization, and can realize the rapid, efficient and safe drying and dehydration of organic solid waste materials.

Description

Technical Field

[0001] The invention belongs to the technical field of organic solid waste drying, and in particular relates to a drying feeding device. Background Art

[0002] Social production and life will generate a large amount of organic solid waste (organic solid waste). If these organic solid wastes are not effectively treated, they will not only cause a series of serious environmental pollution problems, but also lead to a large amount of resource waste. Organic solid waste can be converted into fuel, chemicals or heat through pyrolysis, combustion and other technical means for further utilization, thus turning waste into treasure. However, many types of organic solid waste have high water content, especially domestic garbage, industrial slag, municipal sludge, livestock manure, etc., and their thermal treatment process will be significantly affected by moisture: on the one hand, high moisture content is not conducive to the heating of organic solid waste raw materials; on the other hand, the precipitation of a large amount of water will also interfere with the reaction process or affect product quality, reduce treatment efficiency, and ultimately increase treatment costs. Therefore, it is very necessary to effectively dry the organic solid waste raw materials before treatment.

[0003] Hot air drying is the most common drying method. Indirectly heated air can directly contact the organic solid waste raw materials, causing the raw materials to heat up and take away water vapor. However, the flow resistance of the hot air drying system is large, and high-pressure or medium-pressure fans must be used, which consumes a lot of power. Due to the high gas velocity and large flow rate of hot air, it is often necessary to use large-sized cyclone separators, bag dust collectors and other subsequent processing equipment, resulting in problems such as difficult tail gas treatment, complex device structure, and large floor space. Compared with external drying methods such as hot air, flame, and electric heating, microwave heating drying is a more efficient drying method. Microwaves form a high-frequency electric field, causing the polar water molecules inside the raw materials to vibrate violently and reciprocate to generate heat, and finally the temperature of the water rises and directly leaves the raw materials. Unlike external heating drying methods such as hot air, microwave drying is an internal heating method. It can directly heat the water molecules inside the raw materials without the need for heat conduction. The heating rate is fast and uniform, while reducing energy loss. Microwave drying technology has the characteristics of high efficiency, rapidity, and energy saving, and has been increasingly used in various fields.

[0004] At present, most microwave drying processes use independent microwave drying equipment. For example, Chinese patent document CN109879576A designs a two-stage treatment process using microwaves to achieve drying and pyrolysis. The livestock manure needs to be dried by microwaves first and then sent to the pyrolysis system for subsequent decomposition reaction. However, this independent drying process requires the simultaneous provision of drying, conveying, dry material storage and other devices, which has a complex structure and a large footprint, and is not conducive to the promotion of technology. Due to the high efficiency of microwave heating and the fast drying rate, and the screw feeder has the characteristics of simple structure and reliable operation, it is the main feeding equipment for pyrolysis, combustion and other devices, and microwave heating has the potential to be directly combined with the screw feeder. However, there are still many problems in the current combination of microwave heating and screw feeder technology. For example, a continuous vacuum microwave drying device disclosed in Chinese patent document CN102538425A has a large space in its microwave drying chamber, which is conducive to the thermal expansion of water, but on the contrary will lead to the dissipation of microwaves, making it difficult to concentrate heat and low drying efficiency; while in Chinese patent documents CN106738435A and CN111226577A, the outer edge of the spiral blade is close to the wall of the drying chamber pipe, and water vapor is released only through a small exhaust pipe, which can reduce heat loss, but this exhaust process is only suitable for raw materials with low moisture content or slow traditional heating methods. If the moisture content of the raw material is high, the rapid heating of microwaves will cause a sharp release of moisture, a sudden increase in volume, and it cannot be removed in time, and eventually the pressure is too high, blocking the pipeline and damaging the equipment.

[0005] In view of the above problems existing in the prior art, in order to fully combine the advantages of microwave heating and spiral feeding, realize rapid drying of organic solid waste raw materials and improve space utilization, it is necessary to develop a new type of drying device. Summary of the invention

[0006] The present invention aims to solve the technical problem that the existing microwave device cannot achieve rapid, efficient and safe dehydration of organic solid waste raw materials under the premise of ensuring low energy loss, fast drying rate and compact space.

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a drying feeding device, including a feeding system, a spiral feeding system, a microwave heating system and a water vapor guiding system, wherein:

[0008] The spiral feeding system comprises a spiral tube, a rotating shaft, a spiral driving unit and spiral blades, wherein the spiral tube is a hollow circular tube arranged transversely; the spiral tube is divided into a feeding area, a first sealing area, a drying area, a second sealing area and a discharging area which are connected in sequence from one end to the other end; the rotating shaft which runs from the feeding area to the discharging area is coaxially arranged in the spiral tube; the rotating shaft is driven by the spiral driving unit, and a continuous spiral blade is fixedly arranged around the rotating shaft; the parts of the spiral blade in the feeding area and the discharging area are arranged as pushing blades for pushing materials, the parts in the first sealing area and the second sealing area are arranged as sealing blades for maintaining sealing, and the parts in the drying area are arranged as constant pressure blades for stirring materials; the edges of the sealing blades are provided with sealing sheets which fit the inner wall of the spiral tube, and the sealing blades form a local sealing structure with the inner wall of the spiral tube in the first sealing area and the second sealing area; the constant pressure blades are provided with constant pressure holes which serve as water vapor channels;

[0009] The outlet of the feeding system is connected to the top of the feeding area for inputting materials; the water vapor guide system is connected to the top of the drying area for discharging water vapor generated by the materials in the drying area;

[0010] The water vapor guide system comprises a box body, a breathable baffle and a water vapor guide pipe; the breathable baffle is arranged in the box body, separating the internal cavity of the box body from the drying area, and can block the material in the drying area and allow water vapor to pass through; the position of the breathable baffle in the box body can be adjusted up and down, and the height can be set according to the expansion volume of the material, so as to maintain the safety pressure in the drying area and control the density of the material; the water vapor guide pipe is arranged at the top of the box body near one end of the discharge area, and is used to discharge the water vapor in the box body;

[0011] A plurality of microwave heating systems are arranged along the axial direction of the spiral tube and disposed at the side of the drying zone for emitting microwaves to the material in the drying zone; the material discharging zone is provided with an outlet for outputting the material to a reactor for subsequent reaction.

[0012] Preferably, the temperature of the drying zone is set to 100-200°C.

[0013] Preferably, the difference between the outer diameter of the spiral blade and the inner diameter of the spiral tube does not exceed 2 mm.

[0014] Preferably, the length of the first sealing area and / or the second sealing area is not less than the pitch of the sealing blade.

[0015] As a preferred microwave heating system, the microwave heating system includes a microwave generator, a microwave guide tube, a flange connecting tube, a thick ceramic sheet, a sealing ring and a countersunk flange; the microwave generator is used to generate microwaves; one end of the microwave guide tube is connected to the microwave generator, and the other end is connected to the flange connecting tube; the flange connecting tube is connected to one end of the countersunk flange through the thick ceramic sheet and the sealing ring in sequence, and the other end of the countersunk flange is connected to the drying area.

[0016] As a preferred feeding system, the feeding system includes a hopper with a larger inner diameter at the top and a smaller inner diameter at the bottom, and an agitator is horizontally arranged inside the hopper. The agitator consists of a stirring shaft, a plurality of stirring blades evenly distributed on the stirring shaft, and a driving device.

[0017] The technical solution of the present invention provides a drying feeding device, the core of which is a sealing blade that realizes the sealing of the drying area, a constant pressure blade that allows water vapor to communicate, a water vapor guide system that assists the timely discharge of water vapor, and a microwave heating system that effectively avoids energy dissipation. The organic solid waste raw material as the material is pushed by the pushing blade to pass through the sealing area and enter the microwave heating system. After microwave heating and the turning of the constant pressure blade, the moisture is quickly and evenly removed. The material itself expands, and the water vapor is depressurized through the constant pressure hole to maintain the pressure balance in the drying area; the water vapor is discharged by the water vapor guide system, and the harmful substances contained in the water vapor can be further catalytically decomposed in the purification system and then emptied; the dehydrated material that cannot pass through the breathable partition is discharged from the discharge area under the push of the spiral blade and enters the reaction chamber for subsequent reactions.

[0018] The beneficial effects of the above technical scheme of the embodiment of the present invention are as follows: 1. Using microwaves as a heating method can penetrate into the interior of the material and heat it evenly. It has low requirements on the size and shape of the raw materials, can reduce the power consumption of crushing pretreatment, has a fast heating rate, concentrated heat, and strong penetration; even for low-water materials with a moisture content of less than 30%, it can be quickly dried by microwaves with low energy consumption; the moisture in the material directly absorbs microwaves to heat up, and no additional heat exchange fluid is required, thus avoiding secondary pollution of the fluid. At the same time, it greatly simplifies the device structure, is clean and environmentally friendly, has high space utilization, and reduces equipment and land costs; microwaves can only heat target water molecules, so the thermal inertia is small, there is no thermal hysteresis effect, and it is easy to control. The temperature can be adjusted in time and the start and stop can be done quickly, and the working state of the device can be flexibly changed to adapt to changes in material components.

[0019] 2. The arc pipe of the microwave heating system is conducive to microwave reflection, which limits the microwave within the pipe, resulting in small heat loss, high heating efficiency, concentrated heating range and high energy utilization rate. The moisture inside the material is directly heated by microwaves, which quickly heats up to produce a large amount of water vapor and form many tiny channels, making the raw materials expand and become loose, less likely to stick or accumulate, which can ensure the stable operation of the equipment and facilitate the occurrence of subsequent reactions. At the same time, the material is kept turning during the heating process to avoid local overheating and achieve overall uniform heating.

[0020] 3. The drying feeding device adopts an independent microwave heating system to avoid affecting the operation of the device due to problems with the single microwave equipment, and is easy to replace and repair.

[0021] 4. The drying feeding device forms a sealing area by setting sealing blades, which can effectively prevent the pressure generated by the expansion of water from overflowing outside the drying area of ​​the spiral tube, and has strong pressure resistance;

[0022] 5. The drying feeding device can realize automatic exhaust to ensure safe operation. It utilizes the expansion effect of the material after the moisture is heated. The water vapor is automatically discharged from the water vapor guide system through the constant pressure hole and the breathable baffle, effectively reducing the gas pressure in the spiral tube; at the same time, by adjusting the position of the breathable baffle, the expansion height of the material is controlled to avoid clogging the pipeline and damaging the equipment due to excessive pressure. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 A front view of a drying feeding device provided by an embodiment of the present invention;

[0024] Figure 2 for Figure 1 A top view of the dry feed device shown;

[0025] Figure 3 A schematic diagram of the structure of a spiral blade in a drying feeding device provided in an embodiment of the present invention;

[0026] Figure 4 A structural schematic diagram of a microwave heating system in a drying feeding device is provided for an embodiment of the present invention;

[0027] Figure 5 for Figure 4 The connection diagram of the microwave heating system shown;

[0028] Figure 6 for Figure 4 A schematic structural diagram of a flange connection pipe in the microwave heating system shown;

[0029] Figure 7 for Figure 4 A schematic diagram of the structure of a thick ceramic sheet in the microwave heating system shown;

[0030] Figure 8 for Figure 4 A schematic structural diagram of a sealing ring in the microwave heating system shown;

[0031] Fig. 9 A schematic structural diagram of a microwave generator in a drying feeding device is provided for an embodiment of the present invention;

[0032] Description of component symbols in the figure:

[0033] 1-feeding system; 11-hopper; 12-mixer;

[0034] 2-screw feeding system; 21-screw pipe; 211-feeding area; 212-first sealing area; 213-drying area; 214-second sealing area; 215-discharging area; 22-rotating shaft; 23-screw driving unit; 24-screw blade; 241-pushing blade; 242-sealing blade; 2421-sealing sheet; 243-constant pressure blade; 2431-constant pressure hole;

[0035] 3-microwave heating system; 31-microwave generator; 311-power supply; 312-microwave tube; 313-magnet; 314-microwave output device; 32-microwave guide tube; 33-flange connecting tube; 34-thick ceramic sheet; 35-sealing ring; 36-counterbore flange;

[0036] 4-steam guide system; 41-box; 42-air-permeable baffle; 43-steam guide pipe;

[0037] 5- Reactor. DETAILED DESCRIPTION

[0038] In order to make the technical problems to be solved, technical solutions and advantages of the present invention more clear, a detailed description will be given below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0040] The present invention aims at the technical problems existing in the existing microwave devices and provides a drying feeding device, such as Figures 1 to 3As shown, it includes a feeding system 1, a spiral feeding system 2, a microwave heating system 3 and a water vapor guide system 4. The spiral feeding system 2 is composed of a spiral tube 21, a rotating shaft 22, a spiral driving unit 23 and a spiral blade 24. The spiral tube 21 is a hollow circular tube arranged horizontally; the spiral tube 21 is divided into a feeding area 211, a first sealing area 212, a drying area 213, a second sealing area 214 and a discharging area 215 which are connected in sequence from one end to the other end; a rotating shaft 22 is coaxially arranged in the spiral tube 21, which passes through the feeding area 211 to the discharging area 215; the rotating shaft 22 rotates under the drive of the spiral driving unit 23, and the spiral driving unit 23 is usually a motor, which can be installed in the spiral tube 21, or as shown in FIG. Figure 1 , Figure 2 As shown, it is installed at the end of the feeding area 211, and the rotating shaft 22 can extend from the end of the feeding area 211 of the spiral tube 21 and be connected to the motor.

[0041] like Figure 1 and Figure 3 As shown, a continuous spiral blade 24 is fixedly arranged around the rotating shaft 22; the parts of the spiral blade 24 in the feeding area 211 and the discharging area 215 are arranged as push blades 241 for pushing the material forward; the parts of the spiral blade 24 in the first sealing area 212 and the second sealing area 214 are arranged as sealing blades 242 for maintaining sealing, and the edges of the sealing blades 242 are provided with sealing sheets 2421 that fit with the inner wall of the spiral tube 21, and the sealing blades 242 and the inner wall of the spiral tube 21 form a local sealing structure in the first sealing area 212 and the second sealing area 214; the parts of the spiral blades 24 in the drying area 213 are arranged as constant pressure blades 243 for stirring the material; the constant pressure holes 2431 serving as water vapor channels are opened on the constant pressure blades 243; different types of spiral blades 24 are seamlessly connected in sequence.

[0042] As a preferred embodiment, the spiral tube 21 is a horizontally arranged hollow circular tube with a diameter of 150 mm; the diameter of the rotating shaft 22 is 50 mm, and the lengths of the feeding area 211, the first sealing area 212, the drying area 213, the second sealing area 214 and the discharging area 215 in the spiral tube 21 are respectively set to 240 mm, 80 mm, 640 mm, 80 mm and 120 mm; the outer diameter of the spiral blade 24 differs from the inner diameter of the spiral tube 21 by no more than 2 mm, and the pitch of the spiral blade 24 is 80 mm. Those skilled in the art can select the corresponding component size according to actual needs.

[0043] The outlet of the feeding system 1 is connected to the top of the feeding area 211 for inputting materials. Figure 1 , Figure 2As shown, the feeding system 1 includes an inverted triangle hopper 11 with a larger inner diameter at the top and a smaller inner diameter at the bottom. A stirrer 12 is horizontally arranged inside the hopper 11. The stirrer 12 is composed of a stirring shaft, a plurality of stirring blades evenly distributed on the stirring shaft, and a driving device. As a preferred embodiment, the stirrer 12 can be arranged parallel to the rotating shaft 22, and the stirring blades can be set to seven and arranged alternately on the stirring shaft; the stirrer 12 can be linked with the rotating shaft 22 and powered by a spiral drive unit. Those skilled in the art can choose other arrangements according to actual needs.

[0044] The water vapor guide system 4 is connected to the top of the drying area 213 to discharge the water vapor generated by the materials in the drying area 213. Figure 1 , Figure 2 As shown, the water vapor guide system 4 includes a box body 41, a breathable partition 42 and a water vapor guide pipe 43; the breathable partition 42 is arranged at the lower part of the box body 41, separating the box body 41 from the drying area 213, and the water vapor in the drying area 213 can enter the box body 41 through the breathable partition 42; the water vapor guide pipe 43 is arranged at the top of the box body 41 near one end of the discharge area 215, and is used to discharge the water vapor in the box body 41. The water vapor can be guided by a negative pressure fan to quickly pass through the breathable partition 42, and then discharged to the purification device through the water vapor guide pipe 43.

[0045] A plurality of microwave heating systems 3 are arranged along the axial direction of the spiral tube 21 and disposed at the side of the drying zone 213, and are used to emit microwaves to the material in the drying zone 213; Figure 1 , Figure 2 As shown, six sets of microwave heating systems 3 are horizontally and equidistantly arranged on each side of the drying zone 213. Those skilled in the art can select the number of microwave heating systems 3 to be arranged according to actual needs. As a preferred embodiment, the microwave intensity is set to maintain the temperature of the drying zone 213 at 100~200°C.

[0046] As a preferred embodiment of the microwave heating system 3, Figures 4 to 8 As shown, the microwave heating system 3 includes a microwave generator 31, a microwave guide tube 32, a flange connecting tube 33, a thick ceramic sheet 34, a sealing ring 35 and a countersunk flange 36, wherein: the microwave generator 31 is used to generate microwaves; one end of the microwave guide tube 32 is connected to the microwave generator 31, and the other end is connected to the flange connecting tube 33; the flange connecting tube 33 is connected to one end of the countersunk flange 36 through the thick ceramic sheet 34 and the sealing ring 35 in sequence, and the other end of the countersunk flange 36 is connected to the drying area 213.

[0047] As a preferred embodiment of the microwave generator 31, Fig. 9 As shown, the microwave generator 31 is composed of a magnetron, and mainly includes a power supply 311 , a microwave tube 312 , a magnet 313 and a microwave output device 314 .

[0048] The discharge zone 215 is provided with an outlet, which can be directly connected to the reactor 5 for outputting the material to the reactor 5 for subsequent reaction; the reactor 5 can be a pyrolysis, combustion, catalytic or other reactor.

[0049] The operation process of the above-mentioned dry feeding device is described in detail below:

[0050] First, the spiral drive unit, usually a motor, is started to drive the rotating shaft to rotate; the rotating shaft drives the spiral blades and the agitator to rotate together, and the microwave generator is started at the same time; the domestic waste material is fed into the feeding system, and with the assistance of the agitator, it evenly enters the gap between the spiral tube and the spiral blades from the feeding area; under the push of the pushing blades, the material gradually moves forward, passes through the sealing blades and the constant pressure blades in turn, and enters the drying area; under the continuous microwave heating of the microwave heating system and the turning of the constant pressure blades, the domestic waste heats up rapidly, and the moisture content rapidly decreases from 55% to 10%, and the material itself expands and loosens, and the temperature in the drying area is maintained at 200°C; the generated water vapor, under the guidance of the negative pressure fan and its own expansion, quickly passes through the breathable baffle and is discharged from the water vapor guide system, reducing the pressure in the spiral tube; the harmful substances entrained by the water vapor are further catalytically decomposed in the purification system and then emptied; and the dehydrated domestic waste material that cannot pass through the breathable baffle is discharged from the discharge area under the push of the pushing blades and enters the reaction chamber for subsequent reactions.

[0051] The drying feeding device provided in the above embodiments of the present invention has the characteristics of fast drying rate, concentrated heating range, uniform heating, fast start and stop, easy control, high space utilization, energy saving and high efficiency, strong pressure resistance, strong adaptability to raw materials and reactors, etc., and can realize fast, efficient and safe dehydration of organic solid waste raw materials.

[0052] In the above description of the present invention, it should be understood that the terms "upper", "lower", "axial", "horizontal", "lateral", "inner", "outer", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention; the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features in the description of the present invention; the terms "several" and "multiple" mean two or more, unless otherwise clearly and specifically defined.

[0053] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] For the above-mentioned embodiments of the present invention, common knowledge such as the known specific structures and characteristics in the scheme is not described in detail; each embodiment is described in a progressive manner, and the technical features involved in each embodiment can be combined with each other without conflicting with each other.

[0055] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as falling within the scope of protection of the present invention.

Claims

1. A drying feeding device, comprising a feeding system (1), a spiral feeding system (2) and a microwave heating system (3), characterized in that: Also included is a water vapor guide system (4), wherein: The spiral feeding system (2) comprises a spiral tube (21), a rotating shaft (22), a spiral driving unit (23) and a spiral blade (24); the spiral tube (21) is a hollow circular tube arranged transversely; the spiral tube (21) is divided from one end to the other end into a feeding area (211), a first sealing area (212), a drying area (213), a second sealing area (214) and a discharging area (215) which are connected in sequence; the spiral tube (21) is coaxially arranged with the rotating shaft (22) penetrating from the feeding area (211) to the discharging area (215); the rotating shaft (22) is driven by the spiral driving unit (23); the spiral blade (24) is continuously fixedly arranged around the rotating shaft (22); the spiral blade ( 24) The portions within the feeding zone (211) and the discharging zone (215) are provided with a pushing blade (241) for pushing the material, the portions within the first sealing zone (212) and the second sealing zone (214) are provided with a sealing blade (242) for maintaining sealing, and the portion within the drying zone (213) is provided with a constant pressure blade (243) for stirring the material; the edge of the sealing blade (242) is provided with a sealing sheet (2421) which is in contact with the inner wall of the spiral tube (21); the constant pressure blade (243) is provided with a constant pressure hole (2431) which serves as a water vapor passage; the length of the first sealing zone (212) and / or the second sealing zone (214) is not less than the pitch of the sealing blade (242); The outlet of the feeding system (1) is connected to the top of the feeding area (211) for inputting materials; The water vapor guide system (4) is connected to the top of the drying area (213) and is used to discharge water vapor generated by the material in the drying area (213); the water vapor guide system (4) comprises a box (41), a breathable baffle (42) and a water vapor guide pipe (43); the breathable baffle (42) is arranged in the box (41) to separate the internal cavity of the box (41) and the drying area (213), and can block the material in the drying area (213) and allow water vapor to pass through; the water vapor guide pipe (43) is arranged at the top of the box (41) near the discharge area (215) and is used to discharge water vapor in the box (41); A plurality of microwave heating systems (3) are arranged axially along the spiral tube (21) and disposed on the side of the drying zone (213), and are used to emit microwaves to the material in the drying zone (213); The material discharge zone (215) is provided with an outlet for discharging the material to the reactor for subsequent reaction.

2. The dry feeding device according to claim 1, characterized in that: The temperature of the drying zone (213) is set to 100-200°C.

3. The dry feeding device according to claim 1, characterized in that: The difference between the outer diameter of the spiral blade (24) and the inner diameter of the spiral tube (21) does not exceed 2 mm.

4. The dry feeding device according to any one of claims 1 to 3, characterized in that: The microwave heating system (3) comprises a microwave generator (31), a microwave guide tube (32), a flange connection tube (33), a thick ceramic sheet (34), a sealing ring (35) and a countersunk flange (36), wherein: The microwave generator (31) is used to generate microwaves; one end of the microwave guide tube (32) is connected to the microwave generator (31), and the other end is connected to the flange connection tube (33); the flange connection tube (33) is connected to one end of the countersunk flange (36) through the thick ceramic sheet (34) and the sealing ring (35) in sequence, and the other end of the countersunk flange (36) is connected to the drying area (213).

5. The dry feeding device according to any one of claims 1 to 3, characterized in that: The feeding system (1) comprises a hopper (11) with an inner diameter that is larger at the top and smaller at the bottom. A stirrer (12) is horizontally arranged inside the hopper (11). The stirrer (12) comprises a stirring shaft, a plurality of stirring blades evenly distributed on the stirring shaft, and a driving device.

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