A high-efficiency sulfur hexafluoride and nitrogen mixed gas separation and recovery device

Abstract

The application discloses a kind of high-efficiency sulfur hexafluoride and nitrogen mixed gas separation and recovery device, it is related to sulfur hexafluoride and nitrogen separation technical field, including tank body, fan blade, be set to tank body inside, and the fan blade one end penetrates tank body, driving motor, by coupling installation in the one end of fan blade, refrigeration cavity, set in the inner wall of tank body, the flow of cold carrier is arranged in the inside of refrigeration cavity, liquid output pipe, be arranged in the below of tank body, gas input pipe, be arranged in the below of tank body, gas output pipe, set in the above of tank body.The application is driven by fan blade mixed gas and forms high-speed vortex, using centrifugal force field makes the density of sulfur hexafluoride larger and enriches in the outside of tank body inner wall, cooperate with the low-temperature wall surface of refrigeration cavity, realize accurate feeding, concentrated refrigeration, substantially improve the liquefaction efficiency of sulfur hexafluoride.

Description

Technical Field

[0001] This invention relates to the field of sulfur hexafluoride and nitrogen separation technology, specifically to a high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas. Background Technology

[0002] Sulfur hexafluoride (SF6), as an excellent insulating gas, is widely used in high-voltage electrical equipment. However, it has an extremely high greenhouse effect potential and is one of the six greenhouse gases whose emissions are restricted. In practical applications, sulfur hexafluoride is often mixed with nitrogen (N2) to reduce costs. However, this also brings technical challenges to the separation and recovery of the mixed gas. Traditional separation methods mainly include cryogenic liquefaction separation, membrane separation, and adsorption separation. Among them, cryogenic liquefaction separation liquefies sulfur hexafluoride by lowering the temperature, thereby achieving separation from nitrogen. It is currently a relatively mature technology in industry.

[0003] However, existing cryogenic liquefaction separation devices still have many shortcomings in practical applications. Most devices adopt a general cooling method, that is, uniformly cooling the mixed gas in the tank through a refrigeration chamber or heat exchanger. This undifferentiated cooling method lacks specificity and cannot distinguish the differences in physical properties of different components in the mixed gas. Since nitrogen has a relatively high specific heat capacity and its liquefaction temperature is much lower than that of sulfur hexafluoride, nitrogen will absorb a considerable proportion of the cooling capacity during the synchronous cooling process. However, this part of the cooling capacity does not directly contribute to the liquefaction of sulfur hexafluoride, resulting in a significant increase in the energy consumption of the refrigeration system, while the actual liquefaction efficiency of sulfur hexafluoride is difficult to improve. In other words, the existing technology distributes the cooling capacity evenly to all mixed gases, rather than prioritizing the sulfur hexafluoride component that needs to be liquefied, resulting in a "cooling waste" phenomenon. Summary of the Invention

[0004] The purpose of this invention is to provide a highly efficient separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas, in order to solve the problems mentioned in the background art.

[0005] To solve the above-mentioned technical problems, the present invention provides the following technical solution: a high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen, comprising, Tank body; A fan blade is installed inside the tank, with one end of the fan blade penetrating through the tank. The drive motor is mounted on one end of the fan blade via a coupling; A refrigeration chamber is disposed in the inner wall of the tank, and a flowing refrigerant is disposed inside the refrigeration chamber; The liquid outlet pipe is located at the bottom of the tank. The gas inlet pipe is located at the bottom of the tank. The gas outlet pipe is located above the tank. The gas-liquid separation membrane is installed inside the tank on the side near the gas output pipe.

[0006] Furthermore, a crushing roller is provided below the fan blade, and several crushing rollers are arranged in a ring below the fan blade, with the crushing rollers located above the output end of the gas input pipe.

[0007] A distribution ring is provided at the bottom of the interior of the tank. The distribution ring is connected to the gas input pipe and has several gas outlets.

[0008] Furthermore, the fan blade has several atomizing holes on the side wall near the inner wall of the tank, and the output direction of the atomizing holes is perpendicular to the inner wall of the tank.

[0009] The crushing roller is provided with a liquid extraction device, and several of the liquid extraction devices are arranged in a straight line on one side of the crushing roller.

[0010] The fan blade has a flow channel inside, and the atomizing hole is connected to the liquid pumping through the flow channel.

[0011] Furthermore, the liquid extraction is located on the upper and lower sides in the direction of movement of the crushing roller.

[0012] Furthermore, the heat exchange assembly is connected to both the liquid output pipe and the gas input pipe.

[0013] The heat exchange component has a physical partition inside, and the pressure of the liquid in the inner cavity of the heat exchange component is lower than the pressure inside the tank. The heat exchange component cools the mixed gas that is pre-input into the tank by outputting the low-temperature liquid.

[0014] Furthermore, the heat exchange assembly includes,

[0015] The heat exchange tubes are connected to the tank via liquid outlet pipes;

[0016] The threaded tubes are arranged in a ring inside the heat exchange tubes and are connected to the gas input tubes.

[0017] Furthermore, the cross-section of the threaded tube is a flat rectangle.

[0018] Furthermore, the heat exchange assembly also includes a guide tube, which is located on the distribution axis of a plurality of threaded tubes, and the outer wall of the guide tube is in contact with the inner wall of the threaded tube.

[0019] Compared with the prior art, the beneficial effects achieved by the present invention are:

[0020] By using a fan to drive the mixed gas to form a high-speed vortex, the centrifugal force field is used to enrich the dense sulfur hexafluoride on the outer side of the inner wall of the tank. Combined with the low temperature wall of the refrigeration chamber, precise feeding and centralized refrigeration are achieved, which greatly improves the liquefaction efficiency of sulfur hexafluoride.

[0021] The integrated design of the atomizing orifice, liquid extraction and flow channel relies on the air pressure difference to achieve automatic liquid atomization and spraying without the need for additional power; the liquid film remains dynamically stable under the action of gravity and airflow shear, avoiding damage and ensuring long-term high-efficiency operation;

[0022] The crushing roller and distribution ring structure cuts the input mixed gas into microbubbles, prolonging their residence time in liquid sulfur hexafluoride, increasing the contact area, and enhancing the gas-liquid initial cooling heat exchange; at the same time, droplets are sprayed through atomizing holes to form a flowing liquid film, enhancing the heat conduction capacity between the tank wall and the gas.

[0023] The heat exchange component uses the output low-temperature liquid sulfur hexafluoride to precool the mixed gas that is about to enter the tank, realizing the recovery and utilization of cold energy; combined with counter-current heat exchange and vortex flow structure, it maximizes the gas-liquid temperature difference and reduces the load on the refrigeration system. Attached Figure Description

[0024] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof. In the drawings:

[0025] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0026] Figure 2 This is a front view full sectional structural diagram of the present invention;

[0027] Figure 3 This is a schematic diagram of the three-dimensional structure of the wind turbine blade of the present invention;

[0028] Figure 4 This is a schematic diagram of the three-dimensional structure of a single wind turbine blade of the present invention;

[0029] Figure 5 This is a three-dimensional cross-sectional view of a single fan blade of the present invention;

[0030] Figure 6 This is a schematic diagram of the three-dimensional structure of the distribution ring of the present invention;

[0031] Figure 7 This is a front view full sectional structural diagram of the heat exchange component of the present invention;

[0032] Figure 8 This is a three-dimensional structural diagram of the internal mechanism of the heat exchanger tube of the present invention.

[0033] In the diagram: 1. Tank body; 101. Liquid output pipe; 102. Gas input pipe; 103. Gas output pipe; 104. Distribution ring; 2. Fan blade; 201. Crushing roller; 202. Atomizing hole; 203. Liquid pumping; 204. Flow channel; 3. Drive motor; 4. Refrigeration chamber; 5. Gas-liquid separation membrane; 6. Heat exchange assembly; 601. Heat exchange tube; 602. Threaded tube; 603. Guide tube. Detailed Implementation

[0034] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0035] Please see Figures 1-6 This invention provides a technical solution: a high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen, comprising,

[0036] Tank 1;

[0037] Fan blade 2 is installed inside tank body 1, and one end of fan blade 2 penetrates tank body 1;

[0038] The drive motor 3 is mounted on one end of the fan blade 2 via a coupling;

[0039] The refrigeration chamber 4 is located inside the inner wall of the tank 1, and a flowing refrigerant is placed inside the refrigeration chamber 4.

[0040] Liquid output pipe 101 is located below tank body 1;

[0041] Gas inlet pipe 102 is located below tank body 1;

[0042] Gas output pipe 103 is located above tank 1;

[0043] The gas-liquid separation membrane 5 is installed inside the tank 1 on the side near the gas output pipe 103.

[0044] This device is a liquefaction separation equipment in an industrial nitrogen and sulfur hexafluoride separation system. That is, under high pressure and low temperature conditions, sulfur hexafluoride gas is liquefied, thereby completing the separation from nitrogen.

[0045] The tank 1 has a cooling chamber 4 inside, which is connected to a refrigerant supply device. The supply device delivers the cooled refrigerant to the cooling chamber 4. During operation, the refrigerant exchanges heat with the mixed gas inside the tank 1. After the heat exchange, the refrigerant returns to the supply device through another pipe connected to the cooling chamber 4 for further cooling.

[0046] When the mixed gas is separated, the drive motor 3 is connected to the fan blade 2 through a coupling. The rotating fan blade 2 disturbs the airflow in the tank 1, causing the airflow in the tank 1 to form a vortex effect. In the tank 1, the strong vortex generated by the rotation of the fan blade 2, the pressure gradient caused by centrifugal force, and the secondary circulation effect, when the fluid rotates at high speed to form a vortex, the outer airflow is strongly compressed by centrifugal force, resulting in a pressure significantly higher than that of the inner layer. This radial pressure gradient forces the inner fluid near the center to be subjected to stronger centrifugal ejection due to its larger angular velocity. On the other hand, driven by the pressure difference, the high-temperature micro-particles are "thrown" to the periphery. At the same time, the vortex is not a strict circular motion - it is accompanied by radial convection mixing: the high-temperature fluid in the inner layer migrates outward, and the relatively low-temperature fluid in the outer layer replenishes it. This forced radial mass exchange, through the material migration driven by centrifugal force, spontaneously transports heat from the center to the periphery.

[0047] The mixture of gases is driven to make high-speed spiral motion and form a centrifugal force field, which forces the larger sulfur hexafluoride to accumulate in the outer ring near the inner wall of tank 1, while the smaller nitrogen gas concentrates in the central area, thus achieving the initial centrifugal stratification of the gas, and the gas density in the outer layer is greater than that in the inner layer under the centrifugal action.

[0048] Meanwhile, the refrigerant channel opened in the inner wall of tank 1 is precisely in close contact with the outer gas layer where the sulfur hexafluoride concentration is highest and most easily liquefied, forming a highly efficient heat exchange structure for the inner wall of tank 1, which is also the cooling wall surface. At the same time, the mixed airflow moves in a vortex state, and the heat in the mixed airflow will be transferred from the inner layer to the outer layer, so that the main heat in the mixed airflow is mainly concentrated in the area where the inner wall of tank 1 is located. The principle and benefit of this collaborative design is that, under the action of centrifugal force, the sulfur hexafluoride gas that most needs to be cooled comes into contact with the coldest wall surface, realizing precise feeding and centralized cooling.

[0049] See Figures 2-6 Below the fan blade 2, a crushing roller 201 is provided. Several crushing rollers 201 are arranged in a ring below the fan blade 2. The crushing rollers 201 are located above the output end of the gas input pipe 102.

[0050] A distribution ring 104 is provided at the bottom of the interior of the tank 1. The distribution ring 104 is connected to the gas input pipe 102 and has several gas outlets.

[0051] The mixed gas enters the tank through the gas inlet pipe 102, and then forms bubbles below the distribution ring 104. As the pressure inside the distribution ring 104 increases, and with dense vents on the distribution ring 104, the mixed gas, under high pressure, contacts the liquefied fluorine hexasulfide accumulated below the tank 1 through the vents on the surface of the distribution ring 104. The liquid hinders the high-speed movement of the mixed gas within itself, causing the gas flow to generate a large number of bubbles after entering the liquid fluid. Simultaneously, a high-speed rotating crushing roller 201 is present inside the liquid. The crushing roller 201 is fixedly connected to the fan blade 2, and the two move synchronously. The crushing roller 201 drives the liquid to impact and break the bubbles synchronously, causing the bubble volume to continuously decrease and the number of bubbles to continuously increase. Furthermore, the surface area of ​​the bubbles in contact with the liquid increases, and the bubbles decrease in size. The rising speed of the bubbles is relatively slowed down to increase the contact area and prolong the release time. The heat carried by the mixed gas flow inside the bubbles is transferred to the liquid, providing initial cooling to the mixed gas flow.

[0052] See Figures 3-6 Several atomizing holes 202 are provided on the side wall of the fan blade 2 near the inner wall of the tank body 1, and the output direction of the atomizing holes 202 is perpendicular to the inner wall of the tank body 1.

[0053] A liquid extraction 203 is provided on the crushing roller 201, and several liquid extraction 203s are arranged in a straight line on one side of the crushing roller 201.

[0054] The fan blade 2 has a flow channel 204 inside, and the atomizing hole 202 is connected to the liquid extraction 203 through the flow channel 204.

[0055] The atomizing hole 202, the liquid extraction 203, and the flow channel 204 are arranged such that the atomizing hole 202 is located on the outside of the fan blade 2. When the fan blade 2 rotates, a high-speed airflow will pass over the outer surface of the atomizing hole 202. At the same time, the atomizing hole 202 is connected to the liquid extraction 203 through the flow channel 204, thereby generating a pressure difference at both ends of the flow channel 204. Since the pressure on the side of the flow channel 204 where the atomizing hole 202 is located is relatively low, under the action of the pressure difference, the fluorine hexasulfide inside the tank 1 will pass through the liquid extraction 203 and the flow channel 204 in sequence, and then be atomized and sprayed out through the atomizing hole 202. A large number of atomized droplets are generated in the fluorine hexasulfide gas enrichment area inside the tank 1. The atomized droplets will exchange heat with the gas they come into contact with during flight, and finally impact the inner wall of the tank 1 to form a liquid film.

[0056] The liquid film mainly serves as a medium for heat transfer between the inner wall of tank 1 and the adjacent gas. The evaporation phase change process of the liquid film absorbs a large amount of latent heat of vaporization, causing the surface temperature of tank 1 to drop sharply. The lower surface temperature further increases the temperature difference between the outer gas and the tank wall 1, thereby enhancing the heat transfer from the gas to the tank wall. Secondly, under the action of gravity or airflow shear, the liquid film is usually in a flowing state, and the thickness of the liquid film always remains dynamically stable and will not continue to increase. At the same time, the thin layer structure of the liquid film itself has a higher thermal conductivity than the gas, and heat is more easily conducted to the inner wall of tank 1 through the liquid film.

[0057] The fan blade 2 rotates, causing the gas inside the tank 1 to form a high-speed airflow. Under the action of gravity and airflow, the thickness of the liquid film remains relatively thin, so as to facilitate heat exchange between the mixed gas and the inner wall of the tank 1. The gas near the liquid film mainly moves along the inner wall of the tank 1, rather than contacting the liquid film in a vertical impact manner, to avoid vertical airflow contact with the liquid film, which could cause damage to the liquid film.

[0058] See Figures 4-6 The liquid extraction 203 is located on the upper and lower sides of the crushing roller 201 in the direction of movement.

[0059] A liquid extraction 203 is provided on one side of the surface where the crushing roller 201 moves. When the crushing roller 201 moves in the liquid, a portion of the liquid will enter the flow channel 204 through the liquid extraction 203 due to the impact of the liquid on the side of the crushing roller 201 moving in the direction of movement, and then be output through the atomizing hole 202.

[0060] See Figures 7-8 Heat exchange component 6 is connected to liquid output pipe 101 and gas input pipe 102 respectively;

[0061] The heat exchange component 6 has a physical partition inside. The pressure inside the liquid cavity of the heat exchange component 6 is lower than the pressure inside the tank 1. The heat exchange component 6 cools the mixed gas in the pre-input tank 1 by outputting the low-temperature liquid.

[0062] The main function of the heat exchange component 6 is to pre-cool the mixed airflow that is about to enter the tank 1 using the output low-temperature liquid fluorine hexasulfide, and to utilize the fluorine hexasulfide that has reached a low temperature state, thereby reducing the waste of refrigeration energy.

[0063] See Figures 7-8 The heat exchange component 6 includes,

[0064] The heat exchange tube 601 is connected to the tank 1 through the liquid output pipe 101;

[0065] The threaded tube 602 is distributed in a ring inside the heat exchange tube 601 and is connected to the gas input tube 102.

[0066] The main function of the threaded tube 602 is to restrict the movement of the mixed gas inside, so that the mixed gas inside the threaded tube 602 and the mixed gas inside the tank 1 both move in a vortex manner, so as to achieve the physical effect that the temperature of the outer layer of the mixed gas is higher than that of the inner layer. At the same time, the threaded tube 602 is distributed in a ring inside the heat exchange tube 601. The flow space formed by the threaded tube 602 and the heat exchange tube 601 is the movement space of liquid fluorine hexasulfide. The threaded tube 602 and the heat exchange tube 601 work together to restrict the movement of the fluid, so that the fluid moves in the same vortex manner inside the heat exchange tube 601. The inner layer of the fluid is adjacent to the outer layer of the mixed gas, which ensures indirect contact between the inner low-temperature liquid fluid and the outer high-temperature gaseous fluid, maximizing the temperature difference between the airflow and the liquid flow and accelerating the heat transfer between them.

[0067] The airflow moves in the opposite direction to the liquid flow, which is called countercurrent cooling.

[0068] See Figures 7-8 The cross-section of the threaded pipe 602 is a flat rectangle.

[0069] The flat rectangular heat exchange area is larger than that of other cross-section airflow pipes, which makes the threaded tube 602 produce an effect similar to heat dissipation fins. At the same time, the flat shape reduces the thickness of the airflow column inside the threaded tube 602, which facilitates the rapid transfer of heat from the gas in the inner layer to the threaded tube 602. In addition, the flat structure can improve the rapid formation of vortex effect of the liquid fluid on the outer side.

[0070] See Figures 7-8 The heat exchange assembly 6 also includes a guide tube 603, which is located on the distribution axis of several threaded tubes 602, and the outer wall of the guide tube 603 is in contact with the inner wall of the threaded tube 602.

[0071] The guide tube 603 is located inside the threaded tube 602. It is mainly used to restrict the movement space of the liquid flow, ensure that the inner layer of the liquid flow is in contact with the outer layer of the air flow, maximize the temperature difference between the two, and accelerate the heat transfer between them.

[0072] Working principle of the invention:

[0073] This device is a liquefaction separation equipment in an industrial nitrogen and sulfur hexafluoride separation system. That is, under high pressure and low temperature conditions, sulfur hexafluoride gas is liquefied, thereby completing the separation from nitrogen.

[0074] The tank 1 has a cooling chamber 4 inside, which is connected to a refrigerant supply device. The supply device delivers the cooled refrigerant to the cooling chamber 4. During operation, the refrigerant exchanges heat with the mixed gas inside the tank 1. After the heat exchange, the refrigerant returns to the supply device through another pipe connected to the cooling chamber 4 for further cooling.

[0075] When the mixed gas is separated, the drive motor 3 is connected to the fan blade 2 through a coupling. The rotating fan blade 2 disturbs the airflow in the tank 1, causing the airflow in the tank 1 to form a vortex effect. In the tank 1, the strong vortex generated by the rotation of the fan blade 2, the pressure gradient caused by centrifugal force, and the secondary circulation effect, when the fluid rotates at high speed to form a vortex, the outer airflow is strongly compressed by centrifugal force, resulting in a pressure significantly higher than that of the inner layer. This radial pressure gradient forces the inner fluid near the center to be subjected to stronger centrifugal ejection due to its larger angular velocity. On the other hand, driven by the pressure difference, the high-temperature micro-particles are "thrown" to the periphery. At the same time, the vortex is not a strict circular motion - it is accompanied by radial convection mixing: the high-temperature fluid in the inner layer migrates outward, and the relatively low-temperature fluid in the outer layer replenishes it. This forced radial mass exchange, through the material migration driven by centrifugal force, spontaneously transports heat from the center to the periphery.

[0076] The mixture of gases is driven to make high-speed spiral motion and form a centrifugal force field, which forces the larger sulfur hexafluoride to accumulate in the outer ring near the inner wall of tank 1, while the smaller nitrogen gas concentrates in the central area, thus achieving the initial centrifugal stratification of the gas, and the gas density in the outer layer is greater than that in the inner layer under the centrifugal action.

[0077] Meanwhile, the refrigerant channel opened in the inner wall of tank 1 is precisely in close contact with the outer gas layer where the sulfur hexafluoride concentration is highest and most easily liquefied, forming a highly efficient heat exchange structure for the inner wall of tank 1, which is also the cooling wall surface. At the same time, the mixed airflow moves in a vortex state, and the heat in the mixed airflow will be transferred from the inner layer to the outer layer, so that the main heat in the mixed airflow is mainly concentrated in the area where the inner wall of tank 1 is located. The principle and benefit of this collaborative design is that, under the action of centrifugal force, the sulfur hexafluoride gas that most needs to be cooled comes into contact with the coldest wall surface, realizing precise feeding and centralized cooling.

[0078] The mixed gas enters the tank through the gas inlet pipe 102, and then forms bubbles below the distribution ring 104. As the pressure inside the distribution ring 104 increases, and with dense vents on the distribution ring 104, the mixed gas, under high pressure, contacts the liquefied fluorine hexasulfide accumulated below the tank 1 through the vents on the surface of the distribution ring 104. The liquid hinders the high-speed movement of the mixed gas within itself, causing the gas flow to generate a large number of bubbles after entering the liquid fluid. Simultaneously, a high-speed rotating crushing roller 201 is present inside the liquid. The crushing roller 201 is fixedly connected to the fan blade 2, and the two move synchronously. The crushing roller 201 drives the liquid to impact and break the bubbles synchronously, causing the bubble volume to continuously decrease and the number of bubbles to continuously increase. Furthermore, the surface area of ​​the bubbles in contact with the liquid increases, and the bubbles decrease in size. The rising speed of the bubbles is relatively slowed down to increase the contact area and prolong the release time. The heat carried by the mixed gas flow inside the bubbles is transferred to the liquid, providing initial cooling to the mixed gas flow.

[0079] The atomizing hole 202, the liquid extraction 203, and the flow channel 204 are arranged such that the atomizing hole 202 is located on the outside of the fan blade 2. When the fan blade 2 rotates, a high-speed airflow will pass over the outer surface of the atomizing hole 202. At the same time, the atomizing hole 202 is connected to the liquid extraction 203 through the flow channel 204, thereby generating a pressure difference at both ends of the flow channel 204. Since the pressure on the side of the flow channel 204 where the atomizing hole 202 is located is relatively low, under the action of the pressure difference, the fluorine hexasulfide inside the tank 1 will pass through the liquid extraction 203 and the flow channel 204 in sequence, and then be atomized and sprayed out through the atomizing hole 202. A large number of atomized droplets are generated in the fluorine hexasulfide gas enrichment area inside the tank 1. The atomized droplets will exchange heat with the gas they come into contact with during flight, and finally impact the inner wall of the tank 1 to form a liquid film.

[0080] The liquid film mainly serves as a medium for heat transfer between the inner wall of tank 1 and the adjacent gas. The evaporation phase change process of the liquid film absorbs a large amount of latent heat of vaporization, causing the surface temperature of tank 1 to drop sharply. The lower surface temperature further increases the temperature difference between the outer gas and the tank wall 1, thereby enhancing the heat transfer from the gas to the tank wall. Secondly, under the action of gravity or airflow shear, the liquid film is usually in a flowing state, and the thickness of the liquid film always remains dynamically stable and will not continue to increase. At the same time, the thin layer structure of the liquid film itself has a higher thermal conductivity than the gas, and heat is more easily conducted to the inner wall of tank 1 through the liquid film.

[0081] The fan blade 2 rotates, causing the gas inside the tank 1 to form a high-speed airflow. Under the action of gravity and airflow, the thickness of the liquid film remains relatively thin, so as to facilitate heat exchange between the mixed gas and the inner wall of the tank 1. The gas near the liquid film mainly moves along the inner wall of the tank 1, rather than contacting the liquid film in a vertical impact manner, to avoid vertical airflow contact with the liquid film, which could cause damage to the liquid film.

[0082] A liquid extraction 203 is provided on one side of the surface where the crushing roller 201 moves. When the crushing roller 201 moves in the liquid, a portion of the liquid will enter the flow channel 204 through the liquid extraction 203 due to the impact of the liquid on the side of the crushing roller 201 moving in the direction of movement, and then be output through the atomizing hole 202.

[0083] The main function of the heat exchange component 6 is to pre-cool the mixed airflow that is about to enter the tank 1 using the output low-temperature liquid fluorine hexasulfide, and to utilize the fluorine hexasulfide that has reached a low temperature state, thereby reducing the waste of refrigeration energy.

[0084] The main function of the threaded tube 602 is to restrict the movement of the mixed gas inside, so that the mixed gas inside the threaded tube 602 and the mixed gas inside the tank 1 both move in a vortex manner, so as to achieve the physical effect that the temperature of the outer layer of the mixed gas is higher than that of the inner layer. At the same time, the threaded tube 602 is distributed in a ring inside the heat exchange tube 601. The flow space formed by the threaded tube 602 and the heat exchange tube 601 is the movement space of liquid fluorine hexasulfide. The threaded tube 602 and the heat exchange tube 601 work together to restrict the movement of the fluid, so that the fluid moves in the same vortex manner inside the heat exchange tube 601. The inner layer of the fluid is adjacent to the outer layer of the mixed gas, which ensures indirect contact between the inner low-temperature liquid fluid and the outer high-temperature gaseous fluid, maximizing the temperature difference between the airflow and the liquid flow and accelerating the heat transfer between them.

[0085] The airflow moves in the opposite direction to the liquid flow, which is called countercurrent cooling.

[0086] The flat rectangular heat exchange area is larger than that of other cross-section airflow pipes, which makes the threaded tube 602 produce an effect similar to heat dissipation fins. At the same time, the flat shape reduces the thickness of the airflow column inside the threaded tube 602, which facilitates the rapid transfer of heat from the gas in the inner layer to the threaded tube 602. In addition, the flat structure can improve the rapid formation of vortex effect of the liquid fluid on the outer side.

[0087] The guide tube 603 is located inside the threaded tube 602. It is mainly used to restrict the movement space of the liquid flow, ensure that the inner layer of the liquid flow is in contact with the outer layer of the air flow, maximize the temperature difference between the two, and accelerate the heat transfer between them.

[0088] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0089] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A highly efficient device for separating and recovering a mixture of sulfur hexafluoride and nitrogen, characterized in that: include, Tank body (1); A fan blade (2) is disposed inside the tank body (1), and one end of the fan blade (2) penetrates the tank body (1). The drive motor (3) is installed at one end of the fan blade (2) via a coupling; A refrigeration chamber (4) is disposed in the inner wall of the tank (1), and a flowing coolant is disposed inside the refrigeration chamber (4); A liquid output pipe (101) is located below the tank body (1); A gas inlet pipe (102) is located below the tank body (1); A gas output pipe (103) is located above the tank (1); The gas-liquid separation membrane (5) is installed inside the tank (1) on the side near the gas output pipe (103).

2. The high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 1, characterized in that: A crushing roller (201) is provided below the fan blade (2). Several crushing rollers (201) are arranged in a ring below the fan blade (2). The crushing rollers (201) are located above the output end of the gas input pipe (102). A distribution ring (104) is provided at the bottom of the interior of the tank (1). The distribution ring (104) is connected to the gas input pipe (102). The distribution ring (104) has several gas outlets.

3. The high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 2, characterized in that: The fan blade (2) has several atomizing holes (202) on the side wall near the inner wall of the tank (1), and the output direction of the atomizing holes (202) is perpendicular to the inner wall of the tank (1). The crushing roller (201) is provided with a liquid extraction (203), and several of the liquid extraction (203) are arranged in a straight line on one side of the crushing roller (201); The fan blade (2) has a flow channel (204) inside, and the atomizing hole (202) is connected to the liquid pump (203) through the flow channel (204).

4. The high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 3, characterized in that: The liquid extraction (203) is located on the upper and lower sides of the crushing roller (201) in the direction of movement.

5. A high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 1 or 4, characterized in that: It also includes the heat exchange assembly (6), which is connected to the liquid output pipe (101) and the gas input pipe (102) respectively; The heat exchange component (6) has a physical partition inside. The pressure of the liquid in the inner cavity of the heat exchange component (6) is less than the pressure in the tank (1). The heat exchange component (6) cools the mixed gas in the pre-input tank (1) by outputting the low-temperature liquid.

6. The high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 5, characterized in that: The heat exchange assembly (6) includes, The heat exchange tube (601) is connected to the tank (1) through the liquid output tube (101); The threaded tube (602) is distributed in a ring inside the heat exchange tube (601), and the threaded tube (602) is connected to the gas input tube (102).

7. The high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 6, characterized in that: The cross-section of the threaded tube (602) is a flat rectangle.

8. The high-efficiency separation and recovery device for a mixture of sulfur hexafluoride and nitrogen gas according to claim 6, characterized in that: The heat exchange assembly (6) also includes a guide tube (603), which is located on the distribution axis of a plurality of threaded tubes (602), and the outer wall of the guide tube (603) is in contact with the inner wall of the threaded tubes (602).

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