Normal and low temperature coupling condensation closed-loop separation device and method for organic waste gas

Abstract

The invention discloses an organic waste gas normal-low temperature coupling condensation closed-loop separation device and method, and relates to the technical field of air pollution abatement, the device comprises a condensation assembly and a defrosting assembly, the condensation assembly comprises a shell, a condensation pipe arranged in the shell, a fixed pipe connected with the condensation pipe, and a motor arranged on the condensation pipe; the defrosting assembly comprises a rotating shaft connected with the motor, a first gear ring connected with the rotating shaft, a second gear set meshed with the first gear ring, an annular gear ring meshed with the second gear set, a defrosting plate arranged on the annular gear ring and an air cylinder arranged on the fixing pipe; the defrosting plate is driven by the motor to rotate circumferentially, the device achieves active dynamic cleaning of the outer wall of the condensation pipe, the structure can scrape off a frost layer which is extremely easy to form in a normal and low temperature coupling environment in real time, it is ensured that the wall of a heat exchange pipe always keeps a constant high heat transfer coefficient, and the service life of the heat exchange pipe is prolonged. And the problems of thermal resistance increase and heat exchange efficiency attenuation caused by frost accumulation of a traditional device are solved.

Description

Technical Field

[0001] This invention relates to the technical field of air pollution control, and in particular to a closed-loop separation device and method for organic waste gas with ambient and low temperature coupling condensation. Background Technology

[0002] With the acceleration of industrialization, the emission of volatile organic compounds (VOCs) has become one of the main sources of air pollution. VOCs not only contain volatile organic compounds such as benzene, toluene, and dichloromethane, but also often generate gases such as carbon monoxide (CO) and carbon dioxide (CO2) during many complex chemical processes. Carbon monoxide is extremely toxic, and its emission into the atmosphere poses a serious threat to human health and ecological safety; while carbon dioxide, as a major greenhouse gas, is a core contributor to global warming due to its large-scale emissions. Therefore, the development of efficient, energy-saving, and environmentally friendly comprehensive waste gas treatment devices has become an urgent need for the industry.

[0003] Currently, existing organic waste gas treatment technologies mainly include activated carbon adsorption, catalytic combustion, and conventional condensation. However, in practical applications, existing technologies have the following significant shortcomings: 1. Low cold energy utilization: Traditional condensation devices typically use single-stage cooling, and the discharged cooling medium still contains a large amount of residual cold energy, which is not effectively utilized in stages, resulting in huge refrigeration energy consumption, which does not meet the requirements of green production. 2. During the switching between ambient and low temperatures, moisture in the waste gas easily frosts on the condenser tube wall, and the resulting frost layer has extremely high thermal resistance. Existing technologies mostly use intermittent shutdown defrosting, which not only reduces production efficiency but also causes fluctuations in condensation temperature, affecting the auxiliary capture or separation effect of components such as carbon monoxide and carbon dioxide. 3. Existing devices cannot guarantee complete closed-loop separation while achieving efficient heat exchange, which can easily cause secondary pollution. To address the above problems, this invention proposes an organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method. Through a mechanical defrosting structure and cold energy cascade circulation logic, it achieves efficient treatment of waste gas components including carbon monoxide and carbon dioxide and complete utilization of cold energy. Summary of the Invention

[0004] The purpose of this section is to outline some aspects of embodiments of the present invention and to briefly describe some preferred embodiments. Simplifications or omissions may be made in this section, as well as in the abstract and title of this application, to avoid obscuring the purpose of these documents; however, such simplifications or omissions should not be construed as limiting the scope of the invention.

[0005] In view of the problems existing in the above-mentioned organic waste gas ambient temperature and low temperature coupled condensation closed-loop separation device and method, the present invention is proposed.

[0006] Therefore, the purpose of this invention is to provide an organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method to achieve efficient treatment and complete utilization of cold energy for waste gas components including carbon monoxide and carbon dioxide.

[0007] To solve the above-mentioned technical problems, the present invention provides the following technical solution: an organic waste gas ambient-low temperature coupled condensation closed-loop separation device includes: a condensation component, including a shell, a condenser tube disposed inside the shell, a fixed tube connected to the condenser tube, and a motor disposed on the condenser tube; a defrosting component, including a rotating shaft connected to the motor, a first gear ring connected to the rotating shaft, a second gear set meshing with the first gear ring, an annular gear ring meshing with the second gear set, a defrosting plate disposed on the annular gear ring, a cylinder disposed on the fixed tube, a slider connected to the cylinder, a defrosting ring sleeved outside the fixed tube, and a limiting rod disposed on the defrosting ring.

[0008] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, wherein: the front end of the shell is provided with a waste gas inlet, the rear end is provided with a waste gas outlet, and the bottom is provided with a mixture outlet.

[0009] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, the condenser tube is fixedly installed inside the outer shell, a coolant inlet is opened at the front end of the condenser tube, and the motor is fixedly installed at the end of the condenser tube.

[0010] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, the fixed pipe is connected to the condenser pipe, the end of the fixed pipe is provided with a coolant outlet, and a groove is provided on the fixed pipe, the groove being a quarter-circular ring.

[0011] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, wherein: the motor output shaft is fixedly connected to the rotating shaft, and the first gear ring is fixedly connected to the end of the rotating shaft, the first gear ring being annular; the second gear set is provided in several sets, the second gear set being a gear set in which two gears are fixedly connected, the second gear set being rotatably disposed on the side wall of the condenser tube, one gear in the second gear set meshing with the first gear ring, and the other gear being disposed outside the condenser tube and meshing with the annular gear ring.

[0012] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, the annular toothed ring is rotatably disposed on the outer wall of the condenser tube, and a plurality of defrosting plates are provided, the defrosting plates being attached to the outer wall of the condenser tube.

[0013] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, wherein: the cylinder is fixedly disposed in the groove, the telescopic end of the cylinder is fixedly connected to the slider, the slider is slidably disposed in the groove, a limiting groove is formed on the slider, and the limiting groove is inclined.

[0014] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, wherein: the defrosting ring is provided in several groups, the defrosting ring is provided with several defrosting support rods, the defrosting support rods are attached to the outer wall of the fixed pipe, the defrosting ring is rotatably disposed outside the fixed pipe, and an annular groove is opened on the inner side of the defrosting ring, and several locking points are opened in the annular groove.

[0015] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, wherein: a spring and a buckle are provided inside the side wall of the fixed pipe, one end of the spring is connected to the fixed pipe and the other end is connected to the buckle, and the buckle is embedded in the annular groove; the limiting rod can be embedded in the limiting groove.

[0016] As a preferred embodiment of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method of the present invention, it includes the following steps:

[0017] S1. Pre-cooling stage: Organic waste gas enters through the waste gas inlet and is pre-cooled by the coolant entering through the coolant inlet;

[0018] S2. Cryogenic condensation: The pre-cooled waste gas flows to the fixed pipe and exchanges heat with the low-temperature coolant in the fixed pipe. The organic components condense and liquefy and are discharged from the mixture outlet.

[0019] S3. Dynamic defrosting: The motor drives the defrosting plate to rotate, scraping away the frost on the outer wall of the condenser tube in real time; the cylinder drives the defrosting ring to reciprocate and rotate, cleaning the frost on the outer wall of the fixed tube.

[0020] S4. Cooling Energy Recovery and Circulation: The coolant discharged from the coolant outlet enters the refrigeration cycle unit for secondary cooling. The cooled coolant then re-enters the condenser tube through the coolant inlet, forming a closed-loop cooling cycle.

[0021] The beneficial effects of this invention are:

[0022] By driving a defrost plate to rotate in a circular motion using a motor, the device achieves active and dynamic cleaning of the outer wall of the condenser tubes. This structure can scrape off the frost layer that is easily formed in a normal-low temperature coupling environment in real time, ensuring that the heat exchange tube wall always maintains a constant high heat transfer coefficient, and avoiding the problems of increased thermal resistance and decreased heat exchange efficiency caused by frost accumulation in traditional devices. Attached Figure Description

[0023] To more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. Wherein:

[0024] Figure 1 This is a schematic diagram of the overall structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0025] Figure 2 This is a schematic diagram of the internal structure of the outer shell of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0026] Figure 3 This is a schematic diagram of the outer shell structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0027] Figure 4 This is a schematic diagram of the internal structure of the condenser tube of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0028] Figure 5 This is a schematic diagram of the condenser tube structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention, omitting the defrosting plate.

[0029] Figure 6 This is a schematic diagram of the fixed pipe structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0030] Figure 7 This is a schematic diagram of the slide plate structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0031] Figure 8 This is a schematic diagram of the defrosting ring structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0032] Figure 9 This is a schematic diagram of the spring structure of the organic waste gas ambient-low temperature coupled condensation closed-loop separation device of the present invention.

[0033] Reference numerals: 100, condenser assembly; 101, outer casing; 102, condenser tube; 103, fixed tube; 104, motor; 200, defrost assembly; 201, rotating shaft; 202, first gear ring; 203, second gear set; 204, ring gear ring; 205, defrost plate; 206, cylinder; 207, slider; 208, defrost ring; 209, limit rod; 1011, exhaust gas inlet; 1012, exhaust gas outlet; 1013, mixture outlet; 1021, coolant inlet; 1031, coolant outlet; 1032, groove; 1033, spring; 1034, buckle; 2071, limit groove; 2081, defrost support rod; 2082, annular groove; 2083, locking point. Detailed Implementation

[0034] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0035] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and those skilled in the art can make similar extensions without departing from the spirit of the invention. Therefore, the invention is not limited to the specific embodiments disclosed below.

[0036] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The phrase "in one embodiment" appearing in different places in this specification does not necessarily refer to the same embodiment, nor is it a single or selective embodiment that is mutually exclusive with other embodiments.

[0037] Secondly, the present invention is described in detail with reference to the schematic diagrams. When detailing the embodiments of the present invention, for ease of explanation, the cross-sectional views illustrating the device structure may be partially enlarged, not according to the usual scale. Furthermore, the schematic diagrams are merely examples and should not limit the scope of protection of the present invention. In addition, actual fabrication should include three-dimensional spatial dimensions of length, width, and depth.

[0038] Reference Figures 1-9This invention provides an organic waste gas ambient-low temperature coupled condensation closed-loop separation device and method. The device includes a condensation assembly 100 and a defrosting assembly 200. The condensation assembly 100 includes a housing 101, a condenser pipe 102 disposed within the housing 101, a fixed pipe 103 connected to the condenser pipe 102, and a motor 104 mounted on the condenser pipe 102. The defrosting assembly 200 includes a rotating shaft 201 connected to the motor 104, a first gear ring 202 connected to the rotating shaft 201, a second gear set 203 meshing with the first gear ring 202, an annular gear ring 204 meshing with the second gear set 203, a defrosting plate 205 mounted on the annular gear ring 204, a cylinder 206 mounted on the fixed pipe 103, a slider 207 connected to the cylinder 206, a defrosting ring 208 sleeved outside the fixed pipe 103, and a limiting rod 209 mounted on the defrosting ring 208.

[0039] The outer casing 101 has an exhaust gas inlet 1011 at its front end, an exhaust gas outlet 1012 at its rear end, and a mixture outlet 1013 at its bottom. A condenser pipe 102 is fixedly installed inside the outer casing 101, with a coolant inlet 1021 at its front end. A motor 104 is fixedly installed at the end of the condenser pipe 102. A fixing pipe 103 communicates with the condenser pipe 102, with a coolant outlet 1031 at its end. A groove 1032, which is a quarter-circular ring, is formed on the fixing pipe 103. The output shaft of the motor 104 is fixedly connected to the rotating shaft 201. The first gear ring 202 is fixedly connected to the end of the rotating shaft 201. The first gear ring 202 is annular. Several sets of second gear groups 203 are provided. Each second gear group 203 consists of two gears fixedly connected. The second gear group 203 is rotatably mounted on the side wall of the condenser pipe 102. One gear in the second gear group 203 meshes with the first gear ring 202, and the other gear is located outside the condenser pipe 102 and meshes with the annular gear ring 204. The annular gear ring 204 is rotatably mounted on the outer side wall of the condenser pipe 102. Several defrost plates 205 are provided, and each defrost plate 205 is in contact with the outer side wall of the condenser pipe 102. The cylinder 206 is fixedly mounted in the groove 1032. The telescopic end of the cylinder 206 is fixedly connected to the slider 207. The slider 207 is slidably mounted within the groove 1032. A limiting groove 2071 is provided on the slider 207, and the limiting groove 2071 is inclined. The defrosting ring 208 is provided in several sets, and several defrosting support rods 2081 are provided on the defrosting ring 208. The defrosting support rods 2081 are attached to the outer wall of the fixed tube 103. The defrosting ring 208 is rotatably disposed outside the fixed tube 103. An annular groove 2082 is formed on the inner side of the defrosting ring 208, and several locking points 2083 are formed in the annular groove 2082. A spring 1033 and a buckle 1034 are provided in the side wall of the fixed tube 103. One end of the spring 1033 is connected to the fixed tube 103, and the other end is connected to the buckle 1034. The buckle 1034 is embedded in the annular groove 2082. The limiting rod 209 can be embedded in the limiting groove 2071.

[0040] Once the device is operational, waste gas containing carbon monoxide, carbon dioxide, and organic solvents enters through the waste gas inlet 1011 at the front end of the outer casing 101. Driven by pressure, the waste gas flows within the annular chamber formed by the outer casing 101 and the internal condenser tube 102. During this process, the cryogenic medium injected into the condenser tube 102 through the coolant inlet 1021 undergoes intense heat exchange with the waste gas through the tube wall. Due to the extremely low temperature of the condenser tube 102 wall, the organic components in the waste gas rapidly reach their dew point and undergo a phase change, precipitating as droplets. The beneficial effects of this process are that, through precise pre-cooling, not only can organic solvents be efficiently recovered, but the solubility of carbon dioxide in the condensate can also be increased by utilizing the temperature drop effect, or a physical capture effect can be achieved on difficult-to-treat gases such as carbon monoxide through a localized ultra-low temperature environment, significantly improving the synergistic treatment capability of harmful gases.

[0041] During the condensation process, the motor 104 starts and drives the rotating shaft 201 to rotate at high speed. The power is transmitted to the second gear set 203 arranged on the pipe wall through the annular first gear ring 202 at the end of the shaft. This unique cross-wall meshing structure realizes the reliable transmission of power from inside the sealed pipe to the external space, avoiding the safety hazards caused by directly deploying electrical components in the external flammable and explosive exhaust gas environment. As the second gear set 203 drives the external annular gear ring 204 to rotate, the defrosting plate 205 close to the pipe wall performs a circumferential sweep. The beneficial effects of this action are extremely significant: it not only removes the frost layer or condensate that is very easy to form under cryogenic conditions in real time, maintaining a constant high heat transfer coefficient of the pipe wall and ensuring a continuous and stable low-temperature treatment capability for components such as carbon monoxide, but also breaks the fluid boundary layer through mechanical disturbance, causing the exhaust gas to generate strong turbulence, greatly enhancing the heat exchange efficiency and shortening the residence time required for compliant treatment.

[0042] The exhaust gas flows from the condenser pipe 102 to the fixed pipe 103, where it enters a deep condensation stage. The temperature is lower here, and more frost forms on the outside of the fixed pipe 103 compared to the condenser pipe 102. Precise localized cleaning is achieved at the end of the device in the fixed pipe 103 section through the reciprocating motion of the cylinder 206. The cylinder 206 drives the slider 207 to perform linear reciprocating motion within the quarter-circular groove 1032. The slider 207 utilizes its unique inclined limiting groove 2071 and the mechanical linkage with the limiting rod 209 to convert the linear thrust into the reciprocating torsional motion of the defrosting ring 208. It achieves efficient sweeping cleaning in the limited space of the end pipe section. The defrost support rod 2081 can scrape off the frost on the surface of the fixed pipe 103. It should be noted that the reciprocating movement of the slider 207 can also scrape off the frost in the groove 1032. With the elastic positioning function of the defrost ring 208 and the inner locking point 2083 and the buckle 1034, the buckle 1034 cooperates with the annular groove 2082 to keep the defrost ring 208 in one position for rotation. The locking point 2083 opened in the annular groove 2082 has a positioning function. Finally, the liquefied products and the captured harmful substances are discharged from the bottom mixture outlet 1013, while the discharged coolant with residual cold is discharged from the coolant outlet 1031 and is redirected to the front pre-cooling stage. This closed-loop design of cascade utilization of cold energy makes the low-temperature energy of the system fully and completely utilized. It not only reduces the load of the refrigeration unit, but also fundamentally solves the problems of low energy efficiency and poor control of carbon monoxide and carbon dioxide emissions in traditional equipment, achieving a high degree of unity between environmental protection and energy saving.

[0043] The advantage of this solution lies in the fact that the defrosting plate 205 is driven by motor 104 to rotate circumferentially, enabling the device to actively and dynamically clean the outer wall of the condenser tube 102. This structure can scrape off the frost layer that easily forms in a normal-low temperature coupling environment in real time, ensuring that the heat exchange tube wall always maintains a constant high heat transfer coefficient, avoiding the problems of increased thermal resistance and decreased heat exchange efficiency caused by frost accumulation in traditional devices. The cross-wall transmission structure composed of the first gear ring 202 and the second gear set 203 successfully isolates the power source motor from the external flammable and explosive organic waste gas environment. This design effectively reduces the risk of safety accidents caused by electrical sparks, while also protecting precision transmission components from corrosion by acidic or alkaline substances in the waste gas, significantly improving the operational reliability of the device. Because the system can maintain a continuously stable ultra-low temperature environment, in addition to efficiently liquefying and recovering organic solvents, it also greatly enhances the physical capture capability of harmful gases such as carbon monoxide (CO) and carbon dioxide (CO2). By leveraging the temperature drop effect to improve the solubility or physical condensation efficiency of these gases, and combined with closed-loop processing logic, the solution addresses the pain point of incomplete treatment of such harmful gases in existing technologies, achieving an extremely high environmental compliance rate. The solution employs a closed-loop circulation design, where the coolant discharged from coolant outlet 1031 is guided to the front end for pre-cooling and heat exchange. This cascaded cold energy recovery mode fully utilizes the work-saving capacity of every degree Celsius temperature difference, ensuring "full utilization" of low-temperature cold energy, significantly reducing the power consumption of the refrigeration unit, and demonstrating significant energy-saving and emission-reduction economic benefits.

[0044] It is important to note that the constructions and arrangements of this application shown in several different exemplary embodiments are merely illustrative. Although only a few embodiments are described in detail in this disclosure, those who consult this disclosure will readily understand that many modifications are possible (e.g., changes in the size, dimensions, structure, shape, and proportions of various elements, as well as parameter values ​​(e.g., temperature, pressure, etc.), mounting arrangements, use of materials, color, orientation, etc.) without substantially departing from the novel teachings and advantages of the subject matter described in this application. For example, an element shown as integrally formed may be composed of multiple parts or elements, the position of elements may be inverted or otherwise altered, and the nature or number or position of discrete elements may be changed or altered. Therefore, all such modifications are intended to be included within the scope of the invention. The order or sequence of any process or method steps may be changed or rearranged according to alternative embodiments. Any "device plus function" clause is intended to cover the structure described herein that performs the function, and not only structurally equivalent but also equivalent in structure. Other substitutions, modifications, alterations, and omissions may be made in the design, operation, and arrangement of the exemplary embodiments without departing from the scope of the invention. Therefore, the present invention is not limited to the specific embodiments, but extends to various modifications that still fall within the scope of the appended claims.

[0045] Furthermore, in order to provide a concise description of exemplary embodiments, not all features of actual embodiments (i.e., those features that are not relevant to the currently considered best mode for carrying out the invention, or those features that are not relevant to implementing the invention) may be omitted.

[0046] It should be understood that numerous specific implementation decisions can be made during the development of any practical implementation, such as in any engineering or design project. Such development efforts may be complex and time-consuming, but for those skilled in the art who benefit from this disclosure, the development effort will be a routine work of design, manufacturing, and production without requiring much experimentation.

[0047] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. A closed-loop separation device for organic waste gas with ambient and low-temperature coupling condensation, characterized in that: include, The condenser assembly (100) includes a housing (101), a condenser tube (102) disposed inside the housing (101), a fixing tube (103) connected to the condenser tube (102), and a motor (104) disposed on the condenser tube (102). The defrosting assembly (200) includes a rotating shaft (201) connected to the motor (104), a first gear ring (202) connected to the rotating shaft (201), a second gear set (203) meshing with the first gear ring (202), an annular gear ring (204) meshing with the second gear set (203), a defrosting plate (205) disposed on the annular gear ring (204), a cylinder (206) disposed on the fixed tube (103), a slider (207) connected to the cylinder (206), a defrosting ring (208) sleeved on the fixed tube (103), and a limiting rod (209) disposed on the defrosting ring (208).

2. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 1, characterized in that: The outer casing (101) is provided with an exhaust gas inlet (1011) at the front end, an exhaust gas outlet (1012) at the rear end, and a mixture outlet (1013) at the bottom.

3. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 2, characterized in that: The condenser tube (102) is fixedly installed inside the outer shell (101), and a coolant inlet (1021) is opened at the front end of the condenser tube (102). The motor (104) is fixedly installed at the end of the condenser tube (102).

4. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 3, characterized in that: The fixed tube (103) is connected to the condenser tube (102). A coolant outlet (1031) is provided at the end of the fixed tube (103). A groove (1032) is provided on the fixed tube (103), and the groove (1032) is a quarter-circular ring.

5. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 4, characterized in that: The output shaft of the motor (104) is fixedly connected to the rotating shaft (201), and the first gear ring (202) is fixedly connected to the end of the rotating shaft (201). The first gear ring (202) is annular. The second gear set (203) is provided with several sets. The second gear set (203) is a gear set with two gears fixedly connected. The second gear set (203) is rotatably set on the side wall of the condenser tube (102). One gear in the second gear set (203) meshes with the first gear ring (202), and the other gear is set outside the condenser tube (102) and meshes with the annular gear ring (204).

6. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 5, characterized in that: The annular toothed ring (204) is rotatably mounted on the outer wall of the condenser tube (102), and several defrost plates (205) are provided, with the defrost plates (205) fitting against the outer wall of the condenser tube (102).

7. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 6, characterized in that: The cylinder (206) is fixedly installed in the groove (1032). The telescopic end of the cylinder (206) is fixedly connected to the slider (207). The slider (207) is slidably installed in the groove (1032). A limiting groove (2071) is opened on the slider (207). The limiting groove (2071) is inclined.

8. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 7, characterized in that: The defrosting ring (208) is provided in several sets, and the defrosting ring (208) is provided with several defrosting support rods (2081). The defrosting support rods (2081) are attached to the outer wall of the fixed tube (103). The defrosting ring (208) is rotatably disposed outside the fixed tube (103). A ring groove (2082) is opened on the inner side of the defrosting ring (208), and several locking points (2083) are opened in the ring groove (2082).

9. The organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 8, characterized in that: A spring (1033) and a buckle (1034) are provided inside the side wall of the fixed tube (103). One end of the spring (1033) is connected to the fixed tube (103), and the other end is connected to the buckle (1034). The buckle (1034) is embedded in the annular groove (2082). The limiting rod (209) can be embedded in the limiting groove (2071).

10. A method using the organic waste gas ambient-low temperature coupled condensation closed-loop separation device as described in claim 9, characterized in that: Includes the following steps: S1. Pre-cooling stage: Organic waste gas enters through the waste gas inlet (1011) and is pre-cooled by the coolant entering through the coolant inlet (1021); S2. Cryogenic condensation: The pre-cooled waste gas flows to the fixed tube (103) and exchanges heat with the low-temperature coolant in the fixed tube (103). The organic components condense and liquefy and are discharged from the mixture outlet (1013). S3. Dynamic defrosting: The motor (104) drives the defrost plate (205) to rotate, scraping off the frost on the outer wall of the condenser tube (102) in real time; the cylinder (206) drives the defrost ring (208) to reciprocate and rotate, cleaning the frost on the outer wall of the fixed tube (103); S4. Cold energy recovery and circulation: The coolant discharged from the coolant outlet (1031) enters the refrigeration cycle unit for secondary cooling. The cooled coolant re-enters the condenser tube (102) through the coolant inlet (1021), forming a closed-loop cold cycle.

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