A continuous microwave vacuum drying equipment based on sodium hydrosulfite

Abstract

The application discloses a continuous microwave vacuum drying equipment based on sodium hydrosulfite, and relates to the technical field of sodium hydrosulfite drying.The application comprises a vacuum tank, a microwave generator is linearly arranged on the inner top of the vacuum tank, an upper feeding assembly is arranged on the top of the vacuum tank, a lower discharging assembly is arranged on the bottom of the vacuum tank, an inner support is arranged in the vacuum tank, and an annular drying assembly is arranged on the outer side of the inner support.The application adopts a stepped sleeve ring mode, can ensure that the upward and downward conveying does not block the microwaves, greatly reduces the usage amount of the microwave generator, reduces the cost, and simultaneously conveys the sodium hydrosulfite from top to bottom, the microwave spacing on the upper side is small, the generated heat is large, the sodium hydrosulfite with large initial humidity can be rapidly dried, the microwave spacing on the lower side is gradually increased, the generated heat is gradually reduced, overheating of the subsequent sodium hydrosulfite can be prevented, the drying heat control is realized by using the conveying height difference, and the control is simple.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of sodium bicarbonate drying, in particular to a continuous microwave vacuum drying equipment based on sodium bicarbonate. BACKGROUND

[0002] Sodium bicarbonate, as a kind of chemical raw material with wide application, is mainly used in papermaking, chemical fertilizer, metallurgy, food processing and other fields. Sodium bicarbonate has high hygroscopicity, so it is easy to be damp in the process of storage and transportation, causing changes in product quality or storage problems. In order to ensure the long-term stability and usability of sodium bicarbonate, it is usually necessary to remove its excessive moisture through a drying process to prevent caking, mildewing or deterioration.

[0003] Microwave vacuum drying technology, as a new type of drying technology in recent years, has many unique advantages, especially in the treatment of materials like sodium bicarbonate with high humidity, it shows great advantages, rapid heating, uniform drying: microwave heating directly excites the water molecules inside the material, making the water evaporate rapidly, thereby improving the drying efficiency. Compared with traditional drying methods, microwave drying has faster heating speed and more uniform water distribution, and can complete the drying process in a short time. The existing microwave vacuum drying equipment is batch drying, which cannot meet the requirements of large-scale and efficient production. In the Chinese patent (publication number: CN105258480B), a high-efficiency continuous vacuum microwave dryer is disclosed. The solid material to be processed is fed to the processing material of the feed drum type sealing device by the feed conveyor belt, the material is uniformly distributed on the material conveying belt in the vacuum chamber by the material uniformizing device, and part of the water is dried under the heating action of the heating plate between the upper and lower material conveying belts. The material is dropped onto the second layer of material conveying belt after being conveyed by the first layer of material conveying belt, and most of the water with a moisture content of ≤85% is dried under the heating action of the first and second heating plates. When the moisture content of the rear section is ≤15%, the microwave heating drying method can save energy by more than 30-40% compared with single microwave or single steam (heat conducting oil) heating drying, and greatly saves drying time. The material is dropped onto the third layer of material conveying belt after being conveyed by the second layer of material conveying belt, and the microwave device is arranged on the third layer of material conveying belt. The material enters the drying process under the microwave heating action of the microwave magnetron device on the third layer of material conveying belt. After the material is dried, it is output to the conveying belt through the discharge drum type sealing device, so that the drying process can be completed quickly. The material uniformizing device uniformly distributes the material on the material conveying belt in the vacuum chamber, and the left and right material turning devices are installed in front of or behind each other. The distance between the left and right material turning devices is ≧0.80m, and a material leveling device is arranged behind the left and right material turning devices. The material turned over by the left and right material turning devices is leveled by the material leveling device.

[0004] The patent has the following technical problems in actual use as the prior art:

[0005] 1. The above application realizes efficient continuous vacuum microwave drying through multi-layer material conveying belts, but the material conveying belts will interfere with each other, and the microwave device can only be arranged between the material conveying belts. When the conveying belt length is too long or the number of layers is too much, a large number of microwave devices are needed, and the microwave devices need to be adjusted from top to bottom to generate different powers to ensure the drying quality, which is high in cost.

[0006] 2. Since the safety powder has extremely high heat sensitivity, any small "hot spot" can exceed its decomposition temperature or even self-ignition point. In a closed vacuum environment, once a point is ignited, it will instantly explode the dust and flammable gas diffused in the entire cavity, which is extremely dangerous. The safety powder is a powder that is easy to generate and accumulate static electricity. In the vacuum drying condition, the air is extracted, the breakdown voltage is reduced, and static electricity is more likely to form high-energy sparks. Therefore, the safety powder needs to be smoothly transported during the vacuum drying process, and the above application needs to be arranged with a material turning device and a material leveling device to realize uniform and flat conveying of the material. Therefore, how to uniformly and smoothly continuously convey the safety powder is particularly important. SUMMARY

[0007] The purpose of the present application is to solve the above problems, and the present application provides a continuous microwave vacuum drying equipment based on safety powder.

[0008] In order to achieve the above purpose, the present application specifically adopts the following technical scheme:

[0009] A continuous microwave vacuum drying equipment based on safety powder, comprising a vacuum tank, a microwave generator is linearly arranged on the inner top of the vacuum tank, an upper feeding assembly is arranged on the top of the vacuum tank, a lower discharging assembly is arranged on the bottom of the vacuum tank, an inner support is arranged in the vacuum tank, and an annular drying assembly is arranged on the outer side of the inner support;

[0010] The annular drying assembly is composed of a plurality of annular drying lines, the annular drying lines are sleeved on the outer side of the inner support, the annular drying lines increase in length from top to bottom, and the lower annular drying line can be sleeved on the outer side of the upper annular drying line. The annular drying line comprises a material distribution assembly fixedly installed on the inner support, a discharging drying line, two annular turning lines, and a material returning drying line. The material distribution assembly is fixedly installed on the inner support, the uppermost material distribution assembly is located directly below the upper feeding assembly, the discharging drying line and the material returning drying line are both composed of two groups of synchronous and reverse running conveying belt lines, the two annular turning lines are located at the two ends of the discharging drying line, the annular turning line is lower than the discharging drying line and higher than the material returning drying line, and a roller pressing space is arranged between the two groups of conveying belt lines of the material returning drying line.

[0011] Further, the material distribution assembly comprises a material distribution hopper fixedly installed on the inner support, two groups of material distribution line bodies and a material receiving hopper, the two groups of material distribution line bodies are arranged in an inverted V shape, the material distribution hopper is arranged above the material distribution line bodies, the interior of the material distribution hopper is provided with a material distribution plate, the material distribution plate is arranged in an inverted V shape and has the same included angle as the two groups of material distribution line bodies, the material receiving hopper is located below the material distribution line bodies, and the material distribution hopper and the material receiving hopper are respectively located at two ends of the material distribution line bodies, the interior of the material receiving hopper is provided with two groups of material receiving cavities, the two groups of conveying belt line bodies in the material discharging and drying line body are respectively located directly below the two groups of material receiving cavities, and the material distribution hopper in the lower annular drying line body is located directly below the roller pressing space in the upper annular drying line body.

[0012] Further, the bottom end of the conveying belt of the material distribution line body is provided with a bottom skirt.

[0013] Further, the inner baffles are arranged between the two groups of material receiving cavities.

[0014] Further, the material receiving hoppers in the annular drying line body gradually decrease in outlet from top to bottom.

[0015] Further, the outlet of the material receiving hopper in the uppermost annular drying line body is half the width of the material discharging and drying line body, the outlet of the material receiving hopper is close to the inner support, and the top of the annular turning line body is provided with a semicircular baffle.

[0016] Further, the feeding assembly comprises a vacuum buffer tank fixedly installed on the top of the vacuum tank, the top of the vacuum buffer tank is provided with a material valve one, the top of the material valve one is provided with a material storage hopper, the bottom outlet of the vacuum buffer tank is provided with a material valve two, and the upper half of the vacuum buffer tank is provided with a vacuum connection pipe one which is connected with the vacuum negative pressure equipment outside.

[0017] Further, the discharging assembly comprises a spiral feeder fixedly installed on the inner bottom of the vacuum tank, the top of one end of the spiral feeder is provided with a feeding hopper which is located directly below the roller pressing space in the lowermost annular drying line body, the bottom of the other end of the spiral feeder is provided with a discharging port, the bottom of the discharging port is provided with a material valve three, the bottom end of the material valve three is provided with a nitrogen buffer tank, the bottom outlet of the nitrogen buffer tank is provided with a material valve four, and the top of the nitrogen buffer tank is provided with a nitrogen inlet and a vacuum connection pipe two, the nitrogen inlet is connected with the nitrogen source outside, and the vacuum connection pipe two is connected with the vacuum negative pressure equipment outside.

[0018] Further, the side cross section of the vacuum tank is arranged in an oval shape, the inner support is arranged in a conical shape, the inner support is made of a conductive metal and is grounded through a busbar, and the grounding resistance is less than 10 Ω.

[0019] The beneficial effects of the present application are as follows:

[0020] 1. This invention adopts a stepped ring method, which ensures that the vertical conveying does not obstruct the microwaves within a limited space, greatly reducing the amount of microwave generator required and lowering costs. At the same time, the sodium hydrosulfite is conveyed from top to bottom. The microwave spacing at the top is smaller, generating more heat to quickly dry the sodium hydrosulfite with high initial moisture content. The microwave spacing at the bottom gradually increases, and the heat generated gradually decreases, preventing the sodium hydrosulfite from overheating. The drying heat is controlled by utilizing the height difference of the conveying. There is no need for a complex microwave generator control structure, making the control simple.

[0021] 2. The present invention adopts a bidirectional annular drying line, which can separate and transport sodium hydrosulfite, resulting in high transport efficiency and high drying efficiency.

[0022] 3. This invention adopts gravity-based material distribution, gravity-based material gathering, and gravity-based material spreading. During the conveying process, the sodium hydrosulfite is automatically mixed and spread evenly without the need for additional turning or spreading devices or external interference. The sodium hydrosulfite is dried efficiently and evenly by natural gravity during the conveying process, which can minimize the generation of static electricity and improve the safety of sodium hydrosulfite drying. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the internal structure of the vacuum tank of the present invention;

[0024] Figure 2 This is a three-dimensional structural diagram of the annular drying component of the present invention;

[0025] Figure 3 This is a top view schematic diagram of the annular drying assembly of the present invention;

[0026] Figure 4 This is a schematic diagram of the annular drying line structure of the present invention;

[0027] Figure 5 This is a schematic diagram of the material distribution hopper and material distribution line structure of the present invention;

[0028] Figure 6 This is a schematic diagram of the feeding component structure of the present invention;

[0029] Figure 7 This is a schematic diagram of the material feeding component structure of the present invention.

[0030] Attached reference numerals: 1. Vacuum tank; 2. Microwave generator; 3. Feeding assembly; 31. Vacuum buffer tank; 32. Material valve one; 33. Storage hopper; 34. Material valve two; 35. Vacuum connection pipe one; 4. Discharging assembly; 41. Screw feeder; 42. Feed hopper; 43. Discharge port; 44. Material valve three; 45. Nitrogen buffer tank; 46. Material valve four; 47. Nitrogen inlet; 48. Vacuum connection pipe two; 5. Inner support; 6. Distribution hopper; 61. Distribution plate; 7. Distribution line; 71. Bottom skirt; 8. Receiving hopper; 81. Inner baffle; 9. Discharge drying line; 10. Circular turning line; 101. Semi-circular baffle; 11. Return drying line; 111. Roller pressing space. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0032] Example 1, as Figures 1-7 As shown, a continuous microwave vacuum drying device based on sodium hydrosulfite includes a vacuum tank 1, a microwave generator 2 is linearly arrayed on the top of the vacuum tank 1, a feeding assembly 3 is provided on the top of the vacuum tank 1, a discharging assembly 4 is provided on the bottom of the vacuum tank 1, an inner support 5 is provided inside the vacuum tank 1, and an annular drying assembly is provided on the outside of the inner support 5.

[0033] The annular drying assembly consists of multiple annular drying lines, all of which are fitted onto the outside of the inner support 5. The length of the annular drying lines increases sequentially from top to bottom, and the lower annular drying line can be fitted onto the outside of the upper annular drying line. The annular drying line includes a material distribution assembly, a discharge drying line 9, two sets of annular turning lines 10, and a return drying line 11, all fixedly installed on the inner support 5. The material distribution assembly is fixedly installed on the inner support 5, with the uppermost material distribution assembly located directly below the feeding assembly 3. The discharge drying line 9 and the return drying line 11 are both composed of two sets of synchronously running in opposite directions of the conveyor belts. The two sets of annular turning lines 10 are located at both ends of the discharge drying line 9. The annular turning lines 10 are lower than the discharge drying line 9 and higher than the return drying line 11. A roller pressing space 111 is provided between the two sets of conveyor belts of the return drying line 11.

[0034] The side cross-section of the vacuum tank 1 is elliptical, and the inner support 5 is conical. The inner support 5 will not affect the microwave. The inner support 5 is made of conductive metal and is grounded through a busbar. The grounding resistance is less than 10Ω. Since the entire device is connected to the inner support 5, it can discharge the static electricity generated by the entire annular drying assembly.

[0035] The sodium hydrosulfite falls into the distribution assembly on the uppermost annular drying line body from the feeding assembly 3, and is divided into two parts under the action of gravity, and then falls on the two groups of conveying belt line bodies in the discharging drying line body 9, and is conveyed from the middle to both sides, for example, the left conveying belt line body conveys the sodium hydrosulfite to the left annular turning line body 10, and then falls on the left conveying belt line body in the return material drying line body 11, which conveys to the middle, both groups of sodium hydrosulfite are conveyed to the middle to the roller pressing space 111, the sodium hydrosulfite is preliminarily rolled, and only the sodium hydrosulfite with greater humidity and agglomeration is rolled, the rolled sodium hydrosulfite falls into the lower distribution assembly, and the above steps are repeated again, so that the sodium hydrosulfite is distributed and laid under the action of gravity, which can uniformly dry the sodium hydrosulfite, and finally the sodium hydrosulfite falls into the discharging assembly 4 through the lowermost roller pressing space 111, and is discharged, thereby realizing efficient continuous vacuum microwave drying of the sodium hydrosulfite.

[0036] It should be noted that the plurality of groups of annular drying line bodies are distributed in a whole cone shape, the uppermost annular drying line body has the smallest width and length, and does not cause mutual shielding, so only the microwave generator 2 needs to be arranged at the inner top, and the advantage of this arrangement is that the distance from the conveying surface of the annular drying line body to the microwave generator 2 increases from top to bottom, and the microwave drying heat decreases, and the advantage of this design is that the initial sodium hydrosulfite has the largest humidity, and is conveyed at high heat, so that the sodium hydrosulfite can be quickly dried while preventing the outer surface sodium hydrosulfite from overheating, and then enters the lower annular drying line body, the length and width of the annular drying line body increase, the conveying time increases, but the drying microwave heat decreases, preventing overheating, by increasing the conveying distance and reducing the drying heat in turn, the sodium hydrosulfite can be quickly dried by using staged drying treatment, and overheating is prevented, and staged temperature control is not required.

[0037] In the above embodiment, the distribution assembly comprises a distribution hopper 6 fixedly installed on the inner support 5, two groups of distribution line bodies 7 and a receiving hopper 8, the two groups of distribution line bodies 7 are arranged in an inverted V shape, the distribution hopper 6 is arranged above the distribution line bodies 7, the inside of the distribution hopper 6 is provided with a distribution plate 61, the distribution plate 61 is arranged in an inverted V shape, and the included angle is the same as that of the two groups of distribution line bodies 7, the receiving hopper 8 is located below the distribution line bodies 7, and the distribution hopper 6 and the receiving hopper 8 are respectively located at both ends of the distribution line bodies 7, the inside of the receiving hopper 8 is provided with two groups of receiving cavities, the two groups of conveying belt line bodies in the discharging drying line body 9 are respectively located directly below the two groups of receiving cavities, and the distribution hopper 6 in the lower annular drying line body is located directly below the roller pressing space 111 in the upper annular drying line body.

[0038] The bottom end of the conveying belt of the distribution line body 7 is provided with a bottom skirt 71.

[0039] An inner baffle 81 is arranged between the two groups of receiving cavities.

[0040] The insurance powder falls on the distribution plate 61 and is classified into two groups, which respectively fall into two groups of distribution lines 7, and then falls between the conveying belt and the bottom skirt 71, and is conveyed to the corresponding receiving cavities, and then falls flat on the discharge drying line 9 through the receiving cavities, and the gravity is used to complete the distribution, folding and paving.

[0041] In the third embodiment, on the basis of the above-mentioned embodiments, the outlet of the receiving hopper 8 in the annular drying line body gradually decreases from top to bottom, which can prevent the uppermost receiving hopper 8 from being blocked by the insurance powder with high humidity, and the insurance powder becomes drier as it goes down, and the small outlet can be used to more evenly realize the paving of the insurance powder.

[0042] In the fourth embodiment, on the basis of the above-mentioned embodiments, the outlet of the uppermost receiving hopper 8 in the annular drying line body is half the width of the discharge drying line 9, and the outlet of the receiving hopper 8 is close to the inner support 5, and the top of the annular turning line body 10 is provided with a semicircular baffle 101.

[0043] Through the design, since the length and width of the uppermost annular drying line body are small, the radius of the annular turning line body 10 is small, and the centrifugal force generated is large, so that the wet insurance powder is initially paved on the conveying belt line body of the discharge drying line 9, and only half of it is paved, which is close to the inner support 5, that is, close to the center of the annular turning line body 10, so that when passing through the uppermost annular turning line body 10, the stacked wet material will fall to the other side under the action of the centrifugal force. For the insurance powder with high humidity, the large centrifugal force generated by quickly passing through the sharp turn can assist the insurance powder to be flat, and the drying efficiency of the wet insurance powder is further improved.

[0044] In the fifth embodiment, on the basis of the above-mentioned embodiments, the feeding assembly 3 includes a vacuum buffer tank 31 fixedly installed on the top of the vacuum tank 1, the top of the vacuum buffer tank 31 is provided with a material valve one 32, the top of the material valve one 32 is provided with a storage hopper 33, the bottom outlet of the vacuum buffer tank 31 is provided with a material valve two 34, and the upper half of the vacuum buffer tank 31 is provided with a vacuum connection pipe one 35, which is connected with the external vacuum negative pressure equipment.

[0045] The insurance powder is first stored in the storage hopper 33, then the material valve one 32 is opened to make the insurance powder enter the vacuum buffer tank 31, the material valve one 32 is closed, the vacuum buffer tank 31 is vacuumized, and then the material valve two 34 is opened to communicate with the inside of the vacuum tank 1 to add material, which does not affect the stable pressure inside the vacuum tank 1.

[0046] In the above embodiment, the blanking assembly 4 further comprises a spiral feeder 41 fixedly installed on the bottom of the vacuum tank 1, the top of one end of the spiral feeder 41 is provided with a feeding hopper 42, the feeding hopper 42 is located directly below the roller pressing space 111 of the lowermost annular drying line body, the bottom of the other end of the spiral feeder 41 is provided with a discharge port 43, the bottom of the discharge port 43 is provided with a third material valve 44, the bottom end of the third material valve 44 is provided with a nitrogen buffer tank 45, the outlet of the bottom of the nitrogen buffer tank 45 is provided with a fourth material valve 46, the top of the nitrogen buffer tank 45 is provided with a nitrogen inlet 47 and a vacuum connection pipe 48, the nitrogen inlet 47 is connected with an external nitrogen source, and the vacuum connection pipe 48 is connected with an external vacuum negative pressure equipment.

[0047] The sodium hydrosulfite enters the spiral feeder 41 through the feeding hopper 42 and is then spirally conveyed to the discharge port 43, at this time, the nitrogen buffer tank 45 is first made vacuum through the vacuum connection pipe 48, then the third material valve 44 is opened, the sodium hydrosulfite enters the nitrogen buffer tank 45, without affecting the internal pressure of the vacuum tank 1, because the sodium hydrosulfite is extremely flammable, if directly discharged, too much air will rush in at too high a speed, which is easy to explode, therefore, at this time, protective nitrogen is injected into the nitrogen buffer tank 45 through the nitrogen inlet 47, until the nitrogen buffer tank 45 is the same as the atmospheric pressure, and finally the fourth material valve 46 is opened to safely discharge the material.

[0048] The above description of disclosed embodiments enables those skilled in the art to carry out or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A continuous microwave vacuum drying apparatus based on sodium hydrosulfite, comprising a vacuum tank (1), characterized in that, The inner top linear array of the vacuum tank (1) is provided with a microwave generator (2), the top of the vacuum tank (1) is provided with a feeding assembly (3), the bottom of the vacuum tank (1) is provided with a discharging assembly (4), the inside of the vacuum tank (1) is provided with an inner support (5), and the outer side of the inner support (5) is provided with an annular drying assembly; The annular drying assembly is composed of a plurality of annular drying line bodies, the annular drying line bodies are sleeved on the outer side of the inner support (5), the annular drying line bodies increase in length from top to bottom, and the lower annular drying line body can be sleeved on the outer side of the upper annular drying line body, the annular drying line body comprises a distributing assembly fixedly installed on the inner support (5), a discharging drying line body (9), two annular turning line bodies (10) and a returning drying line body (11), the distributing assembly is fixedly installed on the inner support (5), the uppermost distributing assembly is located directly below the feeding assembly (3), the discharging drying line body (9) and the returning drying line body (11) are each composed of two groups of synchronous and reverse running conveying belt line bodies, the two annular turning line bodies (10) are located at the two ends of the discharging drying line body (9), the annular turning line body (10) is lower than the discharging drying line body (9) and higher than the returning drying line body (11), and a roller pressing space (111) is arranged between the two groups of conveying belt line bodies of the returning drying line body (11); only the safety powder with high humidity and agglomerates can be pressed when passing through the roller pressing space (111); The discharging assembly (4) comprises a spiral feeder (41) fixedly installed on the inner bottom of the vacuum tank (1), and the top of one end of the spiral feeder (41) is provided with a feeding hopper (42); the feeding hopper (42) is located directly below the roller pressing space (111) in the lowermost annular drying line body, and the safety powder dried last falls into the feeding hopper (42) through the lowermost roller pressing space (111); The distributing assembly comprises a distributing hopper (6) fixedly installed on the inner support (5), two distributing line bodies (7) and a receiving hopper (8), the two distributing line bodies (7) are arranged in an inverted V shape, the distributing hopper (6) is arranged above the distributing line bodies (7), the inside of the distributing hopper (6) is provided with a distributing plate (61), the distributing plate (61) is arranged in an inverted V shape and has the same angle as the two distributing line bodies (7), the receiving hopper (8) is located below the distributing line bodies (7), and the distributing hopper (6) and the receiving hopper (8) are respectively located at the two ends of the distributing line bodies (7), the inside of the receiving hopper (8) is provided with two receiving cavities, the two groups of conveying belt line bodies in the discharging drying line body (9) are respectively located directly below the two receiving cavities, and the distributing hopper (6) in the lower annular drying line body is located directly below the roller pressing space (111) in the upper annular drying line body; the safety powder is divided into two parts through the distributing assembly and then falls on the two groups of conveying belt line bodies in the discharging drying line body (9) to be conveyed from the middle to the two sides.

2. A continuous microwave vacuum drying equipment based on sodium hydrosulfite according to claim 1, characterized in that, The bottom end of the distributing line body (7) conveying belt is provided with a bottom skirt (71).

3. A continuous microwave vacuum drying equipment based on sodium hydrosulfite according to claim 2, characterized in that, Inner baffles (81) are arranged between the two receiving cavities.

4. The continuous microwave vacuum drying equipment based on sodium bisulfate according to claim 3, characterized in that, The hopper (8) in the annular drying line body is gradually reduced from top to bottom.

5. The continuous microwave vacuum drying equipment based on sodium hydrosulfite according to claim 4, characterized in that, The outlet of the hopper (8) in the uppermost annular drying line body is half the width of the discharge drying line (9), and the outlet of the hopper (8) is close to the inner support (5). The top of the annular turning line (10) is provided with a semicircular baffle (101).

6. The continuous microwave vacuum drying equipment based on sodium hydrosulfite according to claim 1, characterized in that, The feeding assembly (3) comprises a vacuum buffer tank (31) fixedly installed on the top of the vacuum tank (1). The top of the vacuum buffer tank (31) is provided with a material valve one (32). The top of the material valve one (32) is provided with a storage hopper (33). The bottom outlet of the vacuum buffer tank (31) is provided with a material valve two (34). The upper half of the vacuum buffer tank (31) is provided with a vacuum connection pipe one (35). The vacuum connection pipe one (35) is connected with the external vacuum negative pressure equipment.

7. The continuous microwave vacuum drying equipment based on sodium bisulfate according to claim 6, characterized by the fact that, The bottom of the other end of the screw feeder (41) is provided with a discharge port (43). The bottom of the discharge port (43) is provided with a material valve three (44). The bottom end of the material valve three (44) is provided with a nitrogen buffer tank (45). The outlet of the bottom of the nitrogen buffer tank (45) is provided with a material valve four (46). The top of the nitrogen buffer tank (45) is provided with a nitrogen inlet (47) and a vacuum connection pipe two (48). The nitrogen inlet (47) is connected with the external nitrogen source. The vacuum connection pipe two (48) is connected with the external vacuum negative pressure equipment.

8. Sodium hydrosulfite-based continuous microwave vacuum drying apparatus according to any one of claims 1 to 7, characterized in that The side cross section of the vacuum tank (1) is elliptical. The inner support (5) is conical. The inner support (5) is a conductive metal and is grounded through a busbar. The grounding resistance is less than 10Ω.

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