Industrial kiln high-concentration oxygen combustion-supporting energy-saving device and working method thereof

Abstract

The invention relates to a high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln and a working method thereof. Comprising a low-temperature liquid storage tank used for storing liquid oxygen, an air bath type vaporizer used for vaporizing the liquid oxygen, a self-operated pressure regulating mechanism used for regulating the pressure of normal-temperature oxygen, a buffer tank used for storing the normal-temperature oxygen and a multi-channel combustor used for conducting oxygen-enriched combustion through the normal-temperature oxygen, and the air bath type vaporizer comprises a base; a plurality of vaporization pipes are installed on the base, a plurality of heat exchange fins are arranged on the outer sides of the vaporization pipes at equal angles, and the ends of the adjacent vaporization pipes are connected through connecting pipes; when the top ring base rotates, the outer wall of the vaporization pipe is defrosted through the rotating brush roller and the brush bristles on the lifting roller, when the sliding block translates, the outer wall of the heat exchange fin is defrosted through the rotating brush roller and the brush bristles on the lifting roller, and the top ring base and the sliding block move in a matched mode, so that defrosting treatment on the vaporization pipe and the heat exchange fin is automatically achieved.

Description

Technical Field

[0001] The invention relates to the technical field of oxygen-enriched combustion, and in particular to a high-concentration oxygen combustion-supporting energy-saving device for an industrial furnace and a working method thereof. Background Art

[0002] The use of high-concentration oxygen for oxygen-enriched combustion technology in industrial furnaces is mainly used in steelmaking furnaces, glass furnaces and smelting industries. Its smelting and melting temperatures are generally above 4000°C. High-concentration oxygen can greatly increase the temperature in the kiln, achieving energy saving and increased production.

[0003] However, in rotary kiln calcining furnaces mainly used in cement production lines, their calcination temperature is around 1450°C, and the maximum temperature in the kiln is below 1700°C. Oxygen-enriched combustion only requires an oxygen content of around 30% to achieve an effect of saving about 8% of coal.

[0004] High-concentration oxygen must be diluted before use. Therefore, high-concentration oxygen is unstable in dilution, pressure, kiln entry method and other aspects. In actual operation, there have been accidents of kiln body burning due to excessively high oxygen concentration entering the kiln, and unstable production caused by unstable oxygen concentration.

[0005] At the same time, when liquid oxygen is vaporized using an air bath vaporizer, the main frosting parts of the vaporizer include the surface of the heat exchange tubes and the surface of the fins. Frosting will reduce the heat exchange efficiency, affect the normal operation of the equipment, and may even cause equipment damage. The existing defrosting devices generally use heating defrosting. The frost layer melts into water and flows downward along the surface of the heat exchange tubes and the fins. Under low temperature conditions, it is easy to solidify and ice on the surface of the heat exchange tubes, the surface of the fins and the bottom of the device. Summary of the invention

[0006] The problem solved by the present invention is to provide an industrial kiln high-concentration oxygen combustion-supporting energy-saving device and a working method thereof, which solves the problem that high-concentration oxygen must be diluted before use. Therefore, high-concentration oxygen has instability in dilution, pressure, kiln entry method and other aspects. In actual operation, there have been accidents of burning the kiln body due to excessively high oxygen concentration entering the kiln and unstable production caused by unstable oxygen concentration.

[0007] At the same time, when liquid oxygen is vaporized using an air bath vaporizer, the main frosting parts of the vaporizer include the surface of the heat exchange tubes and the surface of the fins. Frosting will reduce the heat exchange efficiency, affect the normal operation of the equipment, and may even cause equipment damage. In addition, existing defrosting devices generally use heating defrosting. The frost layer melts into water and flows downward along the surface of the heat exchange tubes and the fins. Under low temperature conditions, it is easy for ice to solidify on the surface of the heat exchange tubes, the surface of the fins and the bottom of the device. Technical problems.

[0008] In order to achieve the above object, the present invention adopts the following technical solutions:

[0009] A high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln, comprising a cryogenic liquid storage tank for storing liquid oxygen, an air-bath vaporizer for vaporizing liquid oxygen, a self-operated pressure regulating mechanism for regulating the pressure of normal-temperature oxygen, a buffer tank for storing normal-temperature oxygen, and a multi-channel burner for oxygen-enriched combustion using normal-temperature oxygen, wherein the air-bath vaporizer comprises a base, on which a plurality of vaporizing tubes are mounted, a plurality of heat exchange fins are arranged at equal angles on the outside of the vaporizing tubes, adjacent ends of the vaporizing tubes are connected by connecting tubes, and a plurality of vaporizing tube ends are connected in sequence by connecting tubes, one end of the vaporizing tubes is connected to a feed pipe, and another end of the vaporizing tubes is connected to a discharge pipe, a defrosting mechanism is mounted on the outside of the vaporizing tubes and the heat exchange fins, the defrosting mechanism comprises a roller brush assembly that moves and rotates along the outside of the vaporizing tubes and the heat exchange fins, and the self-operated pressure regulating mechanism comprises a self-operated gas pressure regulating valve, a safety valve, a manual stop valve, a blow-off valve, and a pressure gauge.

[0010] Preferably, the defrost mechanism comprises a top ring seat rotatably mounted on the top end of the vaporization tube, a fixing seat is fixedly mounted on the outer side of the top ring seat, and a sliding block is slidably mounted on the bottom side of the fixing seat.

[0011] Preferably, a bottom ring seat is fixedly installed on the outer side of the bottom of the vaporization tube, an annular guide rail is arranged on the outer side of the bottom ring seat, a sliding seat is slidably installed on the annular guide rail, a linear guide rail is arranged on the sliding seat, a slide is slidably installed on the linear guide rail, and a roller brush assembly is detachably installed between the slide and the slider.

[0012] Preferably, a slide groove is provided on the bottom side of the fixing seat, a first motor is installed on the end of the fixing seat, a threaded rod is installed on the output end of the first motor located in the slide groove, and the threaded rod is threadably connected to the slider.

[0013] Preferably, the top ring seat and the vaporization tube are connected via a bearing, a gear ring is provided on the top ring seat, a motor frame is installed on the top side of the vaporization tube, a second motor is installed on the motor frame, and a rotating gear is installed on the output end of the second motor.

[0014] Preferably, a third motor is installed in the slide seat, and a first polygonal plug is installed at the output end of the third motor.

[0015] Preferably, the roller brush assembly includes a brush roller, a polygonal roller column is elastically mounted on the bottom of the brush roller, and a lifting roller is mounted on the bottom end of the polygonal roller column, bristles are arranged on the outside of the brush roller and the lifting roller, and a first polygonal socket adapted to the first polygonal plug column is opened on the top side of the brush roller.

[0016] Preferably, an inner cavity is opened inside the bottom end of the brush roller, a spring is installed inside the inner cavity, and the spring is connected to the polygonal roller column.

[0017] Preferably, a second polygonal plug column is installed on the bottom bearing of the lifting roller, and a second polygonal plug hole adapted to the second polygonal plug column is opened on the top of the slide.

[0018] A working method of a high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln, the specific operating steps of the working method are as follows:

[0019] Step 1: The tank truck transfers the liquid oxygen to the cryogenic liquid storage tank for storage. The liquid oxygen stored in the cryogenic liquid storage tank is vaporized by an air bath vaporizer. The vaporized room temperature oxygen is pressure-regulated by a self-operated pressure regulating mechanism and then enters the gas buffer tank. Finally, it is transported to the multi-channel burner to complete oxygen-enriched combustion.

[0020] Step 2: Liquid oxygen enters the vaporization tube through the feed tube, exchanges heat with the outside through the vaporization tube and heat exchange fins, and then vaporizes in several vaporization tubes and is discharged through the discharge tube;

[0021] Step 3: The second motor drives the rotating gear to rotate, cooperates with the meshing gear ring, drives the top ring seat to rotate on the top of the vaporization tube, and at the same time, the first motor drives the threaded rod to rotate, thereby driving the slider to move along the slide groove, and drives the top of the roller brush assembly to move. At this time, the bottom of the roller brush assembly moves along the linear guide rail through the slide, and rotates along the annular guide rail through the slide. At the same time, the roller brush assembly is driven to rotate by the third motor. When the top ring seat rotates, the outer wall of the vaporization tube is defrosted by the rotating brush roller and the bristles on the lifting roller. When the slider translates, the outer wall of the heat exchange fin is defrosted by the rotating brush roller and the bristles on the lifting roller.

[0022] Step 4: The polygonal roller column connected by the lifting roller moves in the inner cavity to compress the spring to facilitate adjustment of the overall length of the roller brush assembly. During installation, the first polygonal socket is docked with the first polygonal column, and then the lifting roller is released, and the spring returns to its original state to achieve the plug-in connection between the second polygonal socket and the second polygonal column. During disassembly, move the lifting roller upward, compress the spring, separate the second polygonal socket and the second polygonal column, and then separate the first polygonal socket from the first polygonal column.

[0023] The beneficial effects of the present invention are: utilizing the central air channel of the multi-channel burner to carry out oxygen-enriched transportation through the device, ensuring that the total air volume reaches an oxygen-enriched concentration of 30%-35%, achieving stable oxygen-enriched combustion, and achieving energy-saving effects under the premise of ensuring stable kiln conditions and safe operation;

[0024] When the top ring seat rotates, the outer wall of the vaporizer tube is defrosted by the rotating brush roller and the bristles on the lifting roller. When the slider moves horizontally, the outer wall of the heat exchange fin is defrosted by the rotating brush roller and the bristles on the lifting roller. The top ring seat and the slider move in coordination to automatically realize the defrosting of the vaporizer tube and the heat exchange fin.

[0025] The polygonal roller column connected by the lifting roller moves in the inner cavity to compress the spring, which makes it easy to adjust the overall length of the roller brush assembly, and then to disassemble and assemble the roller brush assembly between the slider and the slide frame, so as to facilitate the maintenance and replacement of the roller brush assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 2 It is a schematic diagram of the structure of the air bath type vaporizer of the present invention;

[0028] Figure 3 This is a schematic diagram of the first structure of the vaporization tube of the present invention;

[0029] Figure 4 For the present invention Figure 3 A partial enlarged view of the middle A area;

[0030] Figure 5 This is a second structural schematic diagram of the vaporization tube of the present invention;

[0031] Figure 6 It is a cross-sectional view of the roller brush assembly of the present invention.

[0032] Legend:

[0033] 1. Low temperature liquid storage tank; 2. Air bath vaporizer; 3. Self-operated pressure regulating mechanism; 4. Buffer tank; 5. Multi-channel burner; 6. Base; 7. Vaporization tube; 8. Heat exchange fins; 9. Connecting pipe; 10. Feed pipe; 11. Discharge pipe; 12. Top ring seat; 13. Fixed seat; 14. Slide; 15. First motor; 16. Threaded rod; 17. Sliding block; 18. Bottom ring seat; 19. Annular guide Rail; 20, slide; 21, linear guide rail; 22, slide; 23, gear ring; 24, motor frame; 25, second motor; 26, rotating gear; 27, third motor; 28, brush roller; 29, polygonal roller column; 30, lifting roller; 31, bristles; 32, first polygonal socket; 33, first polygonal column; 34, second polygonal socket; 35, second polygonal column; 36, inner cavity; 37, spring. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] Specific examples are given below.

[0036] See also Figure 1 to Figure 6 A high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln comprises a cryogenic liquid storage tank 1 for storing liquid oxygen, an air-bath type vaporizer 2 for vaporizing liquid oxygen, a self-operated pressure regulating mechanism 3 for regulating the pressure of normal-temperature oxygen, a buffer tank 4 for storing normal-temperature oxygen, and a multi-channel burner 5 for oxygen-enriched combustion using normal-temperature oxygen. A tank truck transfers liquid oxygen to the cryogenic liquid storage tank 1 for storage, the liquid oxygen stored in the cryogenic liquid storage tank 1 is vaporized by the air-bath type vaporizer 2, the vaporized normal-temperature oxygen is pressure-regulated by the self-operated pressure regulating mechanism 3, and then enters the gas buffer tank 4, and is finally transported to the multi-channel burner 5 to complete oxygen-enriched combustion.

[0037] The air bath type vaporizer 2 includes a base 6, on which a plurality of vaporization tubes 7 are installed, and a plurality of heat exchange fins 8 are arranged at equal angles on the outside of the vaporization tubes 7, and the ends of adjacent vaporization tubes 7 are connected by connecting tubes 9, and the ends of a plurality of vaporization tubes 7 are connected in sequence by connecting tubes 9, one end of the vaporization tubes 7 is connected to a feed pipe 10, and another end of the vaporization tubes 7 is connected to a discharge pipe 11, and liquid oxygen enters the vaporization tubes 7 through the feed pipe 10, exchanges heat with the outside through the vaporization tubes 7 and the heat exchange fins 8, and then vaporizes in the plurality of vaporization tubes 7, and is discharged through the discharge pipe 11, and a defrosting mechanism is installed on the outside of the vaporization tubes 7 and the heat exchange fins 8, and the defrosting mechanism The structure includes a roller brush assembly that moves and rotates along the outside of the vaporization tube 7 and the heat exchange fin 8, the defrosting mechanism includes a top ring seat 12 rotatably mounted on the top of the vaporization tube 7, a fixed seat 13 is fixedly mounted on the outside of the top ring seat 12, a slider 17 is slidably mounted on the bottom side of the fixed seat 13, a bottom ring seat 18 is fixedly mounted on the outside of the bottom of the vaporization tube 7, an annular guide rail 19 is arranged on the outside of the bottom ring seat 18, a slider 20 is slidably mounted on the annular guide rail 19, a linear guide rail 21 is arranged on the slider 20, a slide 22 is slidably mounted on the linear guide rail 21, and a roller brush assembly is detachably mounted between the slide 22 and the slider 17, and a slide groove 14 is arranged on the bottom side of the fixed seat 13 A first motor 15 is installed at the end of the fixed seat 13, and a threaded rod 16 is installed at the output end of the first motor 15 in the slide groove 14, and the threaded rod 16 is threadedly connected to the slider 17. The top ring seat 12 and the vaporization tube 7 are connected through a bearing, and a gear ring 23 is arranged on the top ring seat 12. A motor frame 24 is installed on the top side of the vaporization tube 7, and a second motor 25 is installed on the motor frame 24. A rotating tooth 26 is installed at the output end of the second motor 25. A third motor 27 is installed in the slide seat 20, and a first polygonal plug 33 is installed at the output end of the third motor 27. The rotating tooth 26 is driven to rotate by the second motor 25, and cooperates with the meshing gear ring 23 to drive the top ring seat 12 The top of the vaporization tube 7 rotates, and at the same time, the first motor 15 drives the threaded rod 16 to rotate, thereby driving the slider 17 to move along the slide groove 14, and driving the top of the roller brush assembly to move. At this time, the bottom of the roller brush assembly moves along the linear guide rail 21 through the slide 22, and at the same time, it rotates along the annular guide rail 19 through the slide 22. At the same time, the roller brush assembly is driven to rotate by the third motor 27. When the top ring seat 12 rotates, the outer wall of the vaporization tube 7 is defrosted by the rotating brush roller 28 and the bristles 31 on the lifting roller 30. When the slider 17 translates, the outer wall of the heat exchange fin 8 is defrosted by the rotating brush roller 28 and the bristles 31 on the lifting roller 30.

[0038] The roller brush assembly includes a brush roller 28, a polygonal roller column 29 is elastically installed at the bottom of the brush roller 28, and a lifting roller 30 is installed at the bottom of the polygonal roller column 29, bristles 31 are arranged on the outside of the brush roller 28 and the lifting roller 30, a first polygonal plug hole 32 adapted to the first polygonal plug column 33 is opened on the top side of the brush roller 28, an inner cavity 36 is opened inside the bottom end of the brush roller 28, a spring 37 is installed inside the inner cavity 36, and the spring 37 is connected to the polygonal roller column 29, a second polygonal plug column 35 is installed on the bottom end bearing of the lifting roller 30, and a second polygonal plug column 35 adapted to the second polygonal plug column 35 is opened on the top of the slide 22 Hole 34, the polygonal roller column 29 connected by the lifting roller 30 moves in the inner cavity 36 to compress the spring 37, so as to adjust the overall length of the roller brush assembly. During installation, the first polygonal hole 32 is connected to the first polygonal column 33, and then the lifting roller 30 is released, and the spring 37 returns to its original state, thereby realizing the plug-in connection between the second polygonal hole 34 and the second polygonal column 35. During disassembly, the lifting roller 30 is moved up, the spring 37 is compressed, the second polygonal hole 34 and the second polygonal column 35 are separated, and then the first polygonal hole 32 is separated from the first polygonal column 33.

[0039] The self-operated pressure regulating mechanism 3 includes a self-operated gas pressure regulating valve, a safety valve, a manual stop valve, a blow-off valve and a pressure gauge, which directly utilizes the energy of the controlled medium itself for automatic control and operation, and has a pressure regulation accuracy of ±5%. The pressure is not affected by changes in flow rate; it is safe, energy-saving, convenient and reliable.

[0040] The central air channel of the multi-channel burner 5 is used to transport oxygen through the device to ensure that the total air volume reaches an oxygen-enriched concentration of 30%-35%, thereby achieving stable oxygen-enriched combustion and achieving energy-saving effects while ensuring stable kiln conditions and safe operation;

[0041] When the top ring seat 12 rotates, the outer wall of the vaporization tube 7 is defrosted by the rotating brush roller 28 and the bristles 31 on the lifting roller 30. When the slider 17 translates, the outer wall of the heat exchange fin 8 is defrosted by the rotating brush roller 28 and the bristles 31 on the lifting roller 30. The top ring seat 12 and the slider 17 move in coordination to automatically realize the defrosting of the vaporization tube 7 and the heat exchange fin 8.

[0042] The polygonal roller column 29 connected by the lifting roller 30 moves in the inner cavity 36 to compress the spring 37, so as to adjust the overall length of the roller brush assembly, thereby facilitating the disassembly and assembly of the roller brush assembly between the slider 17 and the slide 22, and facilitating the maintenance and replacement of the roller brush assembly.

[0043] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln, characterized in that: The invention comprises a cryogenic liquid storage tank (1) for storing liquid oxygen, an air-bath type vaporizer (2) for vaporizing liquid oxygen, a self-operated pressure regulating mechanism (3) for regulating the pressure of normal-temperature oxygen, a buffer tank (4) for storing normal-temperature oxygen, and a multi-channel burner (5) for performing oxygen-enriched combustion using normal-temperature oxygen. The air-bath type vaporizer (2) comprises a base (6), on which a plurality of vaporizer tubes (7) are mounted, and a plurality of heat exchange fins (8) are arranged at equal angles on the outer side of the vaporizer tubes (7), and adjacent ends of the vaporizer tubes (7) are connected by connecting tubes (9). The ends of the vaporizer tubes (7) are connected in sequence through connecting tubes (9), one of the ends of the vaporizer tubes (7) is connected to a feed pipe (10), and the other end of the vaporizer tube (7) is connected to a discharge pipe (11). A defrosting mechanism is installed on the outside of the vaporizer tubes (7) and the heat exchange fins (8), and the defrosting mechanism includes a roller brush assembly that moves and rotates along the outside of the vaporizer tubes (7) and the heat exchange fins (8). The self-operated pressure regulating mechanism (3) includes a self-operated gas pressure regulating valve, a safety valve, a manual shut-off valve, a blow-off valve and a pressure gauge.

2. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 1, characterized in that: The defrosting mechanism comprises a top ring seat (12) rotatably mounted on the top end of the vaporizing tube (7), a fixing seat (13) is fixedly mounted on the outer side of the top ring seat (12), and a slider (17) is slidably mounted on the bottom side of the fixing seat (13).

3. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 2, characterized in that: A bottom ring seat (18) is fixedly mounted on the outer side of the bottom of the vaporization tube (7), an annular guide rail (19) is arranged on the outer side of the bottom ring seat (18), a slide seat (20) is slidably mounted on the annular guide rail (19), a linear guide rail (21) is arranged on the slide seat (20), a slide frame (22) is slidably mounted on the linear guide rail (21), and a roller brush assembly is detachably mounted between the slide frame (22) and the slider (17).

4. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 3, characterized in that: A sliding groove (14) is provided on the bottom side of the fixing seat (13), a first motor (15) is installed at the end of the fixing seat (13), an output end of the first motor (15) is located in the sliding groove (14) and a threaded rod (16) is installed therein, and the threaded rod (16) is threadedly connected to the slider (17).

5. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 4, characterized in that: The top ring seat (12) and the vaporization pipe (7) are connected via a bearing, a gear ring (23) is provided on the top ring seat (12), a motor frame (24) is installed on the top side of the vaporization pipe (7), a second motor (25) is installed on the motor frame (24), and a rotating gear (26) is installed on the output end of the second motor (25).

6. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 5, characterized in that: A third motor (27) is installed in the slide seat (20), and a first polygonal plug post (33) is installed at the output end of the third motor (27).

7. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 6, characterized in that: The roller brush assembly comprises a brush roller (28), a polygonal roller column (29) being elastically mounted on the bottom of the brush roller (28), and a lifting roller (30) being mounted on the bottom end of the polygonal roller column (29), bristles (31) being arranged on the outside of the brush roller (28) and the lifting roller (30), and a first polygonal plug hole (32) being adapted to a first polygonal plug column (33) being provided on the top side of the brush roller (28).

8. The high-concentration oxygen combustion-supporting energy-saving device for an industrial furnace according to claim 7, characterized in that: An inner cavity (36) is provided inside the bottom end of the brush roller (28), a spring (37) is installed inside the inner cavity (36), and the spring (37) is connected to the polygonal roller column (29).

9. The high-concentration oxygen combustion-supporting energy-saving device for an industrial kiln according to claim 8, characterized in that: A second polygonal plug column (35) is installed on the bearing at the bottom end of the lifting roller (30), and a second polygonal plug hole (34) adapted to the second polygonal plug column (35) is opened on the top of the slide frame (22).

10. The working method of the high-concentration oxygen combustion-supporting energy-saving device for an industrial furnace according to claim 9, characterized in that: The specific steps of this working method are as follows: Step 1: The tank truck transfers liquid oxygen to a cryogenic liquid storage tank (1) for storage. The liquid oxygen stored in the cryogenic liquid storage tank (1) is vaporized by an air bath vaporizer (2). The vaporized room temperature oxygen is pressure-regulated by a self-operated pressure regulating mechanism (3) and then enters a gas buffer tank (4). Finally, the vaporized oxygen is transported to a multi-channel burner (5) to complete oxygen-enriched combustion. Step 2: Liquid oxygen enters the vaporization tube (7) through the feed tube (10), exchanges heat with the outside through the vaporization tube (7) and the heat exchange fins (8), and then vaporizes in a plurality of vaporization tubes (7) and is discharged through the discharge tube (11); Step 3: The second motor (25) drives the rotating gear (26) to rotate, and cooperates with the meshing gear ring (23) to drive the top ring seat (12) to rotate on the top of the vaporization tube (7). At the same time, the first motor (15) drives the threaded rod (16) to rotate, thereby driving the slider (17) to move along the slide groove (14), and driving the top of the roller brush assembly to move. At this time, the bottom of the roller brush assembly moves along the linear guide rail (21) through the slide (22), and rotates along the annular guide rail (19) through the slide (22). At the same time, the roller brush assembly is driven to rotate by the third motor (27). When the top ring seat (12) rotates, the outer wall of the vaporization tube (7) is defrosted by the rotating brush roller (28) and the bristles (31) on the lifting roller (30). When the slider (17) translates, the outer wall of the heat exchange fin (8) is defrosted by the rotating brush roller (28) and the bristles (31) on the lifting roller (30); Step 4: The polygonal roller column (29) connected by the lifting roller (30) moves in the inner cavity (36) to compress the spring (37) to facilitate adjustment of the overall length of the roller brush assembly. During installation, the first polygonal socket (32) is docked with the first polygonal plug column (33), and then the lifting roller (30) is released, and the spring (37) returns to its original state, thereby realizing the plug-in connection between the second polygonal socket (34) and the second polygonal plug column (35). During disassembly, the lifting roller (30) is moved upward, the spring (37) is compressed, the second polygonal socket (34) and the second polygonal plug column (35) are separated, and then the first polygonal socket (32) is separated from the first polygonal plug column (33).

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