CN115597332A

CN115597332A - Drying device and drying method

Info

Publication number: CN115597332A
Application number: CN202211311370.8A
Authority: CN
Inventors: 陈少伟; 刘昱; 姚兵; 孙晓伟
Original assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd; CGN Power Co Ltd; Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
Current assignee: China General Nuclear Power Corp; China Nuclear Power Engineering Co Ltd; CGN Power Co Ltd; Shenzhen China Guangdong Nuclear Engineering Design Co Ltd
Priority date: 2022-10-25
Filing date: 2022-10-25
Publication date: 2023-01-13

Abstract

The application provides a drying device and a drying method. The drying device includes: the drying device comprises a drying barrel, a first support piece and a second support piece, wherein the drying barrel comprises an outer barrel, an inner barrel arranged in the outer barrel and the support piece positioned between the bottom of the inner barrel and the bottom of the outer barrel, a gap exists between the inner barrel and the outer barrel, a plurality of first through holes are formed in the bottom of the inner barrel, the gap between the top of the inner barrel and the top of the outer barrel is an air inlet of the drying device, and the top of the inner barrel is an air outlet of the drying device; and the exhaust fan comprises an air suction port, and the air suction port is communicated with the top of the drying barrel. Under the action of the exhaust fan, warm air flows along the flow direction from the bottom to the top of the inner barrel. The drying mode of initiative convulsions for no matter be at the top of interior bucket, middle part or bottom, the warm braw all can fully contact with moisture waste matter, thereby is favorable to accelerating hot-blast flow, improves drying efficiency, and then does benefit to the reinforcing to the stoving effect of moisture waste matter.

Description

Drying device and drying method

Technical Field

The invention relates to the technical field of nuclear power radioactive wet waste treatment, in particular to a drying device and a drying method.

Background

Nuclear power plants produce radioactive solid waste during operation, wherein a part of the waste contains water, is mostly cotton, and may contain trace amounts of alcohol, detergents, acetone, kerosene, and the like. According to the requirements of the national standards for radioactive solid waste disposal, the waste to be disposed of in shallow formations should be in solid form, in which the volume of free liquid must not exceed 1% of the volume of the waste. Therefore, prior to the treatment and preparation of the aqueous radioactive solid waste, a pre-treatment is carried out to remove the free liquid from the waste to a moisture content of less than 1%.

At present, one common domestic method for treating water-containing radioactive solid wastes is to load the wastes into a steel drum and send the wastes into a drying device for drying treatment. The drying device is mostly of an external air heating type and can batch process 4-12 steel drums. After the water-containing waste is loaded into the steel drum, the water-containing waste is conveyed to a drying chamber of a drying device, air in the drying chamber is circularly heated, moisture in the waste is heated and evaporated, and steam enters a condenser for condensation, so that the aim of removing water is fulfilled.

Because the cotton product has strong heat insulation, wet waste in the deep part of the steel drum cannot be effectively heated and dried after the top cotton textile is dried. In addition, because the steel drum is closed, the drying air flow can not effectively flow, so that the drying effect is poor, and the working efficiency is low.

Disclosure of Invention

Based on this, this application provides a drying device and stoving method to do benefit to and improve drying efficiency and stoving effect.

According to a first aspect of the application, a drying device is provided, which is applied to drying radioactive wet waste of a nuclear power station. The drying device includes: the drying device comprises a drying barrel and a drying device, wherein the drying barrel comprises an outer barrel, an inner barrel arranged in the outer barrel and a supporting piece positioned between the bottom of the inner barrel and the bottom of the outer barrel, a gap exists between the inner barrel and the outer barrel, a plurality of first through holes are formed in the bottom of the inner barrel, a gap between the top of the inner barrel and the top of the outer barrel is an air inlet of the drying device, and an air outlet of the drying device is formed in the top of the inner barrel; and the exhaust fan comprises an air suction port, and the air suction port is communicated with the top of the drying barrel.

In this application, the air intake is used for making the warm braw pass through, gets into in the clearance of interior bucket and outer bucket. Then, warm air enters the inner barrel through the first through hole at the bottom of the inner barrel to dry the wet waste. After drying, the evaporated water is discharged from the top of the inner barrel. The top of the inner barrel is also connected with an exhaust fan which can actively suck. Under the action of the exhaust fan, micro negative pressure is formed inside the inner barrel. The warm air flows in the direction from the bottom to the top of the inner tub. Therefore, the drying mode of active air draft enables the warm air to be fully contacted with the moisture-containing waste no matter at the top, the middle part or the bottom of the inner barrel, thereby being beneficial to accelerating the flow of the hot air, improving the drying efficiency and further being beneficial to enhancing the drying effect of the moisture-containing wet waste.

In some embodiments, the plurality of first through holes are divided into a plurality of layers in a direction from the center to the edge of the bottom of the inner barrel, and the plurality of first through holes are arranged in a circular array in each layer.

In some embodiments, the sidewall of the inner tub is provided with a plurality of second through holes.

In some embodiments, a plurality of second through holes are formed at one side of the center of the sidewall of the inner tub near the bottom.

In some embodiments, the plurality of second through holes are divided into a plurality of layers in a direction from the top to the bottom of the inner barrel, and the plurality of second through holes are uniformly distributed in the circumferential direction in each layer.

In some embodiments, the supporting member includes a plurality of supporting rods, and the plurality of supporting rods are uniformly arranged at one side of the bottom of the outer tub close to the inner tub in the circumferential direction.

In some embodiments, the number of support rods is 3.

In some embodiments, the drying device further comprises a blower configured to supply warm air to the air inlet.

In some embodiments, the outer wall of the outer tub is provided with a plurality of circles of corrugated protrusions.

According to a second aspect of the present application, a drying method is provided, which is applied to the drying apparatus of the first aspect. The drying method comprises the following steps:

placing radioactive wet waste into the inner barrel of the drying barrel;

providing warm air to the air inlet;

and opening the exhaust fan to form negative pressure in the inner barrel.

In the drying method, the air inlet is used for enabling warm air to pass through. The warm air enters into the gap between the inner barrel and the outer barrel. Then, warm air enters the inner barrel through the first through hole at the bottom of the inner barrel to dry the wet waste. After drying, the evaporated water is discharged from the top of the inner barrel. The top of the inner barrel is also connected with an exhaust fan which can actively suck. Under the action of the exhaust fan, micro negative pressure is formed inside the inner barrel. The warm air flows in the direction from the bottom to the top of the inner tub. Therefore, the drying mode of active air draft enables the warm air to be fully contacted with the moisture-containing waste no matter at the top, the middle part or the bottom of the inner barrel, thereby being beneficial to accelerating the flow of the hot air, improving the drying efficiency and further being beneficial to enhancing the drying effect of the moisture-containing wet waste.

Drawings

Fig. 1 is a schematic structural diagram of a drying device according to an embodiment of the present application;

fig. 2 is a schematic structural diagram of a drying tub of the drying apparatus according to the embodiment of the present application;

FIG. 3 is a schematic top view of a drying tub according to an embodiment of the present disclosure;

FIG. 4 is a schematic view of the inner barrel according to the embodiment of the present invention connected to a support member;

fig. 5 is a schematic flow chart of a drying method in an embodiment of the present application.

The reference numbers are as follows:

1-a drying device; 10-drying the barrel; 20-an exhaust fan; 101-an outer barrel; 102-inner barrel; 103-a support; 1021-a first via; a, an air inlet; b, air outlet; 21-air intake; c-a first gap; d-a second gap; 1022 — a second via; e-center position; 1031-support bar; 1011-convex.

Detailed Description

In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein.

In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or to implicitly indicate the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless explicitly specified otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

In the present invention, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the second feature or the first and second features may be indirectly contacting each other through intervening media. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under," "beneath," and "under" a second feature may be directly under or obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and the like as used herein are for illustrative purposes only and do not denote a unique embodiment.

At present, one common method for treating water-containing radioactive solid wastes in domestic nuclear power plants is to load the wastes into a steel drum and send the wastes into a drying device for drying treatment. After the water-containing waste is loaded into the steel drum, the water-containing waste is conveyed to a drying chamber of a drying device, air in the drying chamber is circularly heated, moisture in the waste is heated and evaporated, and steam enters a condenser for condensation, so that the moisture is removed.

The drying device usually monitors the liquid level of the condensate metering tank, and if the condensate does not change obviously within a certain time, the drying of the aqueous waste liquid is considered to be finished, and a drying stop signal is triggered.

Most radioactive solid wastes are cotton products. Because the cotton product has strong heat insulation, wet waste in the deep part of the steel drum cannot be effectively heated and dried after the top cotton product is heated and dried. In addition, because the steel drum is closed, the drying air flow can not effectively flow, so that the drying effect is poor, and the working efficiency is low. After the drying device receives the stop signal and finishes drying, the free water of the water-containing waste at the middle and upper layers of the steel drum is basically removed, but the water-containing waste at the bottom of the steel drum is difficult to contact with hot air with enough volume and temperature, the free water cannot be evaporated, the whole drying effect is poor, and the waste treatment requirement cannot be met.

Based on the problems, the application provides a drying device and a drying method, which are beneficial to improving the drying effect and the drying efficiency.

According to a first aspect of the present application, a drying apparatus 1 is proposed, which is applied to drying radioactive wet waste of a nuclear power plant. As shown in fig. 1, the drying apparatus 1 includes a drying tub 10 and a suction fan 20. The drying tub 10 includes an outer tub 101, an inner tub 102 disposed inside the outer tub 101, and a supporter 103 between the bottom of the inner tub 102 and the bottom of the outer tub 101. A gap is present between the inner tub 102 and the outer tub 101. As shown in fig. 2 and 3, the bottom of the inner tub 102 is provided with a plurality of first through holes 1021, a gap between the top of the outer tub 101 and the inner tub 102 is an air inlet a of the drying device 1, and an air outlet B of the drying device 1 is at the top of the inner tub 102. The suction fan 20 includes a suction port 21, and the suction port 21 communicates with the top of the drying tub 10.

The drying tub 10 includes an outer tub 101, an inner tub 102, and a support 103. The outer tub 101, the inner tub 102, and the supporter 103 are made of stainless steel material to prevent corrosion by moisture of wet wastes. The inner tub 102 is a member for accommodating wet waste.

As shown in fig. 1, the existence of the gap between the inner tub 102 and the outer tub 101 means that a first gap C exists between the side wall of the inner tub 102 and the side wall of the outer tub 101, a second gap D exists between the bottom of the inner tub 102 and the bottom of the outer tub 101, and a third gap, i.e., an air inlet a, also exists between the top opening of the inner tub 102 and the top opening of the outer tub 101. The supporter 103 is disposed in the second gap D between the bottom of the inner tub 102 and the bottom of the outer tub 101. Thus, warm air enters into a first gap C between the side wall of the inner tub 102 and the side wall of the outer tub 101 and a second gap D between the bottom of the inner tub 102 and the bottom of the outer tub 101 through the air inlet a. The bottom of the inner tub 102 is provided with a plurality of first through holes 1021, and the warm air in the first gap C and the second gap D enters the inner tub 102 through the plurality of first through holes 1021 to dry the wet waste. The top of the inner barrel 102 is set as an air outlet B of the drying device, and air after heat exchange with wet waste in the inner barrel 102 can be emitted through the air outlet B.

The suction fan 20 is a component for sucking air in the inner tub 102. By providing the suction fan 20, it is advantageous to improve the air flow in the inner tub 102.

In this application, the air inlet a is used for allowing warm air to pass through and enter a gap between the inner tub 102 and the outer tub 101. Then, the warm air enters the inner tub 102 through the first through hole 1021 at the bottom of the inner tub 102 to dry the wet waste. After drying, the evaporated moisture is discharged from the top of the inner tub 102. The top of the inner barrel 102 is also connected with an exhaust fan 20 which can actively suck. Under the action of the suction fan 20, a slight negative pressure is formed inside the inner tub 102. The warm air flows in a flow direction from the bottom to the top of the inner tub 102. Therefore, the drying mode of active air draft enables the warm air to be fully contacted with the moisture-containing waste no matter at the top, the middle part or the bottom of the inner barrel 102, thereby being beneficial to accelerating the flow of the hot air, improving the drying efficiency and further being beneficial to enhancing the drying effect of the moisture-containing wet waste.

In a specific embodiment, the outer barrel 101 has a capacity of 200L, an outer height of 900mm, an inner height of 850mm, an inner diameter of 560mm, and a barrel wall thickness of 1.2mm to 1.5mm. An outer drum 101 of standard 200L may be used to dump the waste using a steel drum dumping device of a sorting glove box. The inner barrel 102 has a capacity of 129L, an outer height of 780mm, an outer diameter of 460mm, and a wall thickness of 1.2mm. The gap between the inner tub 102 and the outer tub 101 is 50mm, so that the heated air can enter the first gap C and the second gap D from the gap a at the top of the inner tub 102 and the outer tub 101, and then enter the inside of the inner tub 102 from the first through hole 1021 at the bottom to dry the wet waste.

In some embodiments, the exhaust fan 20 may be a negative pressure fan, and the inner tub 102 is exhausted to maintain a slight negative pressure therein, so that warm air continuously enters the inner tub 102 to dry the wet waste, thereby improving the drying effect.

In some embodiments, the first through holes 1021 are divided into multiple layers in a direction from the center to the edge of the bottom of the inner barrel 102, and the first through holes 1021 of each layer are arranged in a circular array.

A plurality of first through holes 1021 is provided at the bottom of the inner tub 102. The present embodiment specifically describes the arrangement rule of the first through holes 1021. Since the wet waste is generally cotton, which has a strong heat insulating property, the plurality of first through holes 1021 are divided into a plurality of layers in a direction from the center to the edge of the bottom of the inner tub 102, as shown in fig. 3. That is, the first through holes 1021 exist in the extending direction from the center position to the edge position of the bottom of the inner barrel 102. Moreover, the first through holes 1021 of each layer are arranged in an annular array, that is, the first through holes 1021 of each layer are circumferentially and uniformly arranged. With the arrangement, the warm air can uniformly flow into the inner barrel 102 from the bottom of the inner barrel 102, so that the wet waste can be uniformly heated, and the overall drying effect can be improved.

In one embodiment, as shown in fig. 3, the first through holes 1021 are divided into an inner layer and an outer layer in a direction from the center to the edge of the bottom of the inner barrel 102. Wherein, a layer near the center of the bottom of the inner barrel 102 is provided with 6 first through holes 1021 uniformly distributed in the circumferential direction, and a layer near the edge of the bottom of the inner barrel 102 is provided with 12 first through holes 1021 uniformly distributed in the circumferential direction. In other embodiments, the plurality of first through holes 1021 can be further divided into a greater number of layers, for example, 3 layers, 4 layers, etc., and each layer can include 5, 7, etc. first through holes 1021, which is not limited in this application.

The shape of the first through hole 1021 may be circular, rectangular, oval, triangular, etc. The shapes of the first through holes 1021 in different layers may be the same or different. For example, all of the first through holes 1021 are circular hole shapes; alternatively, the first through holes 1021 at a layer near the center of the bottom of the inner barrel 102 are circular holes, and the first through holes 1021 at a layer near the edge of the bottom of the inner barrel 102 are rectangular holes. This is not limited by the present application.

In some embodiments, as shown in fig. 1, the sidewall of the inner tub 102 is provided with a plurality of second through holes 1022. In this embodiment, after the warm air enters the gap between the inner barrel 102 and the outer barrel 101, the warm air can enter the inner barrel 102 through the first through holes 1021 at the bottom of the inner barrel 102, and can enter the inner barrel 102 through the second through holes 1022 at the side wall. Therefore, the hot air can be fully contacted with the wet waste, and the drying efficiency and the drying effect can be improved.

In other embodiments, as shown in fig. 4, a plurality of second through holes 1022 are formed at a side of the center of the sidewall of the inner barrel 102 near the bottom. The center of the sidewall of the inner tub 102 means a middle position E of the sidewall in a direction from the bottom to the top of the inner tub 102. In this embodiment, the second through hole 1022 is not disposed on the entire plane of the sidewall, but is disposed only on one side of the sidewall of the inner barrel 102 near the bottom at the middle position E. Under the action of the suction fan 20, the warm air always moves from the bottom of the inner barrel 102 to the top. Therefore, the top of the inner tub 102 is always dried by the warm air, so that the second through hole 1022 is not required to be formed in the upper portion of the sidewall, which is beneficial to reducing the manufacturing cost of the inner tub 102. In addition, the second through holes 1022 are intensively arranged at the middle position E of the side wall of the inner barrel 102 close to one side of the bottom, which is beneficial to further fully contacting the wet waste at the middle and lower layers in the inner barrel 102 with the warm air, thereby ensuring the whole drying effect of the wet waste.

In some embodiments, as shown in fig. 4, in a direction from the top to the bottom of the inner barrel 102, the plurality of second through holes 1022 are divided into multiple layers, and the plurality of second through holes 1022 in each layer are uniformly distributed in a circumferential direction. This embodiment specifically describes the arrangement rule of the second through holes 1022. Specifically, the plurality of second through holes 1022 are divided into multiple layers in a direction from the top to the bottom of the inner tub 102. And, the plurality of second through holes 1022 of each layer are arranged in a ring-shaped array. That is, the second through holes 1022 in each layer are uniformly arranged in the circumferential direction. So set up, be favorable to making the lateral part of wet waste also thermally equivalent, and then do benefit to and improve holistic stoving effect.

In one embodiment, as shown in fig. 4, a plurality of second through holes 1022 are formed at a side of the center of the sidewall of the inner barrel 102 near the bottom, i.e., a side of the middle position E near the bottom. The plurality of second through holes 1022 are divided into 7 layers from bottom to top in a direction from the top to the bottom of the inner tub 102. Wherein, each layer is provided with a plurality of second through holes 1022 uniformly in the circumferential direction, and the number of the second through holes 1022 in each layer is the same. Further, the number of the second through holes 1022 in each layer may be 20. In other embodiments, the plurality of second through holes 1022 may be divided into other layers, such as 3 layers, 4 layers, 8 layers, etc. The number of the second through holes 1022 in each layer may be the same or different. The number of the second through holes 1022 in each layer may include 5, 7, etc., which is not limited in this application.

The shape of the second through-hole 1022 may be circular, rectangular, oval, triangular, etc. The second through holes 1022 located in different layers may have the same shape or different shapes. For example, all of the second through holes 1022 are circular hole shapes; alternatively, the second through holes 1022 in the odd-numbered layers have a circular hole shape, and the second through holes 1022 in the even-numbered layers have a rectangular shape. This is not limited by the present application.

In some embodiments, as shown in fig. 4, the support member 103 includes a plurality of support bars 1031, and the plurality of support bars 1031 are circumferentially and uniformly disposed at one side of the bottom of the outer tub 101 close to the inner tub. By such arrangement, the inner barrel 102 can be stably placed in the outer barrel 101, and the connection stability of the inner barrel and the outer barrel is improved. The support 1031 may be cylindrical, prismatic, etc. in shape, which is not limited in this application. In some embodiments, the support bar 1031 may be integrated with the outer tub 101, separated from the outer tub 101, or the like, which is not limited in this application.

In some embodiments, the number of support bars 1031 is 3. The 3 support rods 1031 are circumferentially and uniformly arranged at one side of the bottom of the outer barrel 101 close to the inner barrel. It can be easily understood that the number of the three support bars 1031 is just right, so as to just ensure the connection stability of the inner tub 102 and the outer tub 101, thereby being beneficial to reducing the processing cost of the drying device 1.

In some embodiments, the drying apparatus 1 further includes a blower (not shown) configured to provide warm air to the air inlet a. The warm air from the blower enters into the gap between the inner tub 102 and the outer tub 101 through the air inlet a, and then enters into the inner tub 102 through the first through hole 1021 at the bottom of the inner tub 102 and the second through hole 1022 at the sidewall, to dry the wet waste.

In some embodiments, as shown in fig. 2, the outer wall of the outer tub 101 is provided with a plurality of circles of corrugated protrusions 1011. The protrusion 1011 is provided to improve the overall strength of the outer tub 101. Specifically, in fig. 2, the outer wall of the outer tub 101 is provided with 2-turn corrugated protrusions 1011. Of course, the number of turns of the corrugated protrusion 1011 may also be 3, 4, etc., and the present application is not limited thereto.

According to a second aspect of the present application, a drying method is provided, which is applied to the drying apparatus 1 of the first aspect. The drying method comprises the following steps:

placing radioactive wet waste into the inner barrel 102 of the drying barrel 10;

providing warm air to the air inlet A;

the suction fan 20 is turned on to create a negative pressure in the inner tub 102.

In the drying method of the present application, the air inlet a is used for allowing warm air to pass through and enter a gap between the inner tub 102 and the outer tub 101. Then, the warm air enters the inner tub 102 through the first through hole 1021 at the bottom of the inner tub 102 to dry the wet waste. After drying, the evaporated moisture is discharged from the top of the inner tub 102. The top of the inner barrel 102 is also connected with an exhaust fan 20 which can actively suck. Under the action of the exhaust fan 20, a slight negative pressure is formed inside the inner barrel 102. The warm air flows in a flow direction from the bottom to the top of the inner tub 102. Therefore, the drying mode of active air draft enables the warm air to be fully contacted with the moisture-containing waste no matter at the top, the middle part or the bottom of the inner barrel 102, thereby being beneficial to accelerating the flow of the hot air, improving the drying efficiency and further being beneficial to enhancing the drying effect of the moisture-containing wet waste.

The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.

The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is specific and detailed, but not to be understood as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims

1. A drying apparatus for drying wet radioactive waste from a nuclear power plant, said drying apparatus comprising:

the drying device comprises a drying barrel, a first support piece and a second support piece, wherein the drying barrel comprises an outer barrel, an inner barrel arranged in the outer barrel and the support piece positioned between the bottom of the inner barrel and the bottom of the outer barrel, a gap exists between the inner barrel and the outer barrel, a plurality of first through holes are formed in the bottom of the inner barrel, the gap between the top of the inner barrel and the top of the outer barrel is an air inlet of the drying device, and the top of the inner barrel is an air outlet of the drying device; and

the exhaust fan comprises an air suction port, and the air suction port is communicated with the top of the drying barrel.

2. The drying apparatus as claimed in claim 1, wherein the plurality of first through holes are divided into a plurality of layers in a direction from a center to an edge of the bottom of the inner tub, and the plurality of first through holes are arranged in a circular array in each layer.

3. The drying apparatus as claimed in claim 1, wherein the inner tub is provided at a sidewall thereof with a plurality of second through holes.

4. The drying apparatus as claimed in claim 1, wherein a plurality of second through holes are formed at a center of the sidewall of the inner tub at a side adjacent to the bottom.

5. The drying apparatus as claimed in any one of claims 3 or 4, wherein the plurality of second through holes are divided into a plurality of layers in a direction from the top to the bottom of the inner tub, and the plurality of second through holes are uniformly distributed in a circumferential direction in each layer.

6. The drying apparatus as claimed in claim 1, wherein the supporting member comprises a plurality of supporting rods, and the plurality of supporting rods are uniformly arranged at a side of the bottom of the outer tub adjacent to the inner tub in a circumferential direction.

7. The drying apparatus of claim 6, wherein the number of the support bars is 3.

8. The drying apparatus of claim 1, further comprising a blower configured to provide warm air to the air inlet.

9. The drying apparatus as claimed in claim 1, wherein the outer tub is provided with a plurality of circles of corrugated protrusions on an outer wall thereof.

10. A drying method applied to the drying apparatus of any one of claims 1 to 9, characterized in that the drying method comprises:

placing radioactive wet waste into the inner barrel of the drying barrel;

providing warm air to the air inlet;

and opening the exhaust fan to form negative pressure in the inner barrel.