Volatile organic compound oil gas treatment equipment and lubricating oil oil gas treatment system

Abstract

The invention relates to the technical field of oil gas recovery treatment, and provides a lubricating oil gas treatment system, and a pulse tube refrigeration device is arranged at an exhaust port of an oil tank, so that a condenser is located between the exhaust port and an inlet of an exhaust pipeline. When the lubricating oil gas is increased and the air pressure is increased, the lubricating oil gas enters the condenser of the pulse tube refrigeration device and is in full contact with condensation sheets of the condenser, and the condenser leads out heat through a cold finger, so that the lubricating oil gas is liquefied and flows back into a lubricating oil tank, and the recycling of the lubricating oil gas is realized; and the air pressure in the lubricating oil tank is controlled, so that the lubricating oil in the oil tank can work normally. According to the lubricating oil gas treatment system, the structure is simple, the condensation single bodies in the condenser can be detached and replaced, and the maintenance difficulty and cost are reduced. Meanwhile, oil gas of the lubricating oil is fully treated, and pollution to the environment is avoided.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of volatile oil and gas treatment, in particular to a treatment device for recovering and treating volatile oil and gas, and a lubricating oil and gas treatment system. BACKGROUND

[0002] With the development of industry, in the case of high-speed operation of the rotating shaft, bearing and gear of large-scale machinery in large factories such as chemical plants, on the one hand, lubrication is needed to reduce friction, reduce mechanical damage and ensure reliable operation of the machinery, on the other hand, cooling is also needed, so generally a lubricating oil station is provided, the lubricating oil of the lubricating oil station is connected to the rotating contact parts of various machinery through an oil pipeline to lubricate and cool them at the same time, and then flows back to the lubricating oil station.

[0003] During the work of the lubricating oil station, the heat of the machinery is continuously brought into the oil station, which causes the temperature of the lubricating oil to rise, and the lubricating oil with a high temperature is prone to produce volatile oil and gas. Therefore, while cooling the oil station, the volatile oil and gas also need to be treated, otherwise the air pressure in the oil station will rise rapidly, affecting the normal operation of the lubricating oil station.

[0004] The treatment of volatile oil and gas is mainly condensation and recovery. The general condensation and recovery treatment technology cannot achieve sufficient recovery, and the emission into the air will cause air and environmental pollution, and it is also difficult to meet the emission requirements. To achieve sufficient condensation and recovery, liquid nitrogen refrigeration is needed. However, the refrigeration system using liquid nitrogen refrigeration is relatively complex, especially the recovery of low-concentration volatile organic compounds is not economical. Secondly, the heat transfer between the mixed gas and the refrigerant is indirect, in order to ensure a high recovery rate, a very low operating temperature is needed, so the liquid nitrogen recovery process has low efficiency and high loss, strict requirements on equipment material and insulation, strict requirements on equipment performance, high equipment personnel maintenance and operation costs, high design and installation costs and site requirements. SUMMARY

[0005] In view of the problems in the prior art in the process of treating lubricating oil and gas condensation and recovery, the present application provides a volatile organic oil and gas treatment device and a lubricating oil and gas treatment system.

[0006] The volatile organic oil and gas treatment device provided by the embodiment of the present application comprises a pulse tube refrigeration device, an exhaust pipeline and a gas return pipeline. The pulse tube refrigeration device includes a condenser, a mounting flange, and a pulse tube refrigerator. The condenser includes at least one condensing unit, which is made of a metal material with a thermal conductivity greater than 200. The condensing unit includes a flat condensing plate, with a first side and a second side formed on its upper and lower sides, respectively. A first connecting component is provided at the center of the first side, and a second connecting component is provided at the center of the second side. The first and second connecting components can be fitted together for installation and fixation. A plurality of flow guide holes are provided on the condensing plate, extending from the first side through the condensing plate to the second side. The pulse tube refrigerator is mounted on the mounting flange, and the cooling finger of the pulse tube refrigerator is fixedly connected to the first connecting component of the first condensing unit in the condenser. The pulse tube refrigeration device is installed on the volatile organic compound storage tank via the mounting flange, and the condenser is positioned between the exhaust port of the volatile organic compound storage tank and the inlet of the exhaust pipe. The outlet of the exhaust pipe is connected to the inlet of the return gas pipe, and the outlet of the return gas pipe is connected to the upper part of the volatile organic compound storage tank.

[0007] This application provides a volatile organic compound (VOC) oil and gas treatment device that utilizes a pulse tube cryostat for the condensation and recovery of VOCs. A pulse tube cryostat is a regenerative cryogenic refrigeration device that uses gas pressure wave oscillation to achieve cooling. It is mainly used in space exploration and satellite technology, superconductivity and quantum computing, as well as some high-precision detection equipment, such as high-purity germanium detectors. The pulse tube cryostat has a strong cryogenic cooling capacity; its cooling finger directly contacts the equipment that needs to be kept at a low temperature, thus enabling objects that require cryogenic operation to be maintained at very low temperatures. The pulse tube refrigeration device provided in this application improves upon the pulse tube refrigeration machine by incorporating a condenser that works in conjunction with it. This condenser is installed on the exhaust port of the volatile organic compound (VOC) storage tank. When the amount of VOC oil and gas increases and its pressure rises, the VOC oil and gas enters the condenser of the pulse tube refrigeration device and comes into full contact with the condenser's condensing fins. The condenser dissipates heat through its cooling fingers, thereby liquefying the VOC oil and gas and returning it to the storage tank. This achieves the recovery and reuse of the VOC oil and gas and controls the pressure in the storage tank, ensuring its normal operation. Some of the unliquefied VOC oil and gas flows back to the storage tank through the exhaust and return pipes for further condensation and liquefaction. The VOC oil and gas treatment equipment provided in this application has a simple structure, and the condenser unit in its condenser can be easily disassembled and replaced, greatly reducing maintenance difficulty and cost. Simultaneously, the VOC oil and gas are fully treated and will not be emitted into the air, avoiding environmental pollution. Thanks to the high efficiency of pulse tube refrigerators and their extremely low temperature control, the liquefaction and condensation efficiency of volatile oils and gases is very high, and the recovery efficiency of volatile organic compounds and oils and gases is also high.

[0008] Preferably, the first and second sides of the condenser plate are both circular surfaces, the area of ​​the first side is smaller than the area of ​​the second side, and an inclined hydrophobic surface is formed from the outer edge of the first side to the outer edge of the second side.

[0009] Preferably, a cooling guide shaft protruding from the first side surface of the condenser is provided at the center of the first side surface of the condenser, and the first connecting component is provided on the cooling guide shaft; a cooling guide column protruding from the second side surface of the condenser is provided at the center of the second side surface of the condenser, and the second connecting component is provided on the cooling guide column.

[0010] Preferably, both the cooling shaft and the cooling column are cylindrical, and the cooling shaft and the cooling column have the same radius.

[0011] Preferably, it includes N condenser units, where N≥2, wherein the second connecting component of the nth condenser unit is fixedly connected to the first connecting component of the (n+1)th condenser unit; 1≤n <N。

[0012] Preferably, it further includes a connecting reinforcement member, which is made of a material with a thermal conductivity of less than 1; the first end of the connecting reinforcement member is fixedly installed to the mounting flange, and the second end of the connecting reinforcement member is fixedly installed to the first condenser unit.

[0013] Preferably, the connecting reinforcement includes at least three connecting reinforcement rods, each with an external thread at its first and second ends. The bottom of the mounting flange has at least three threaded holes spaced at equal intervals, with the bottom center as the distribution center. The distance between the threaded holes and the bottom center of the mounting flange is equal to the distance between one layer of guide holes on the condenser fin and the center of the condenser fin. The connecting reinforcement also includes nuts matching the number of connecting reinforcement rods. The first end of each connecting reinforcement rod is fixed to the threaded hole via the external thread, and the second end of each connecting reinforcement rod passes through a guide hole on the first condenser unit and is fixed to the first condenser unit via the nuts.

[0014] This application also discloses a lubricating oil vapor treatment system, including a lubricating oil tank, an oil outlet pipeline, and an oil return pipeline. The oil outlet pipeline is connected to the oil outlet of the lubricating oil tank, and the oil return pipeline is connected to the first oil return port of the lubricating oil tank. An exhaust port is provided on the top of the lubricating oil tank, and a return gas port is provided on the upper part of the side wall of the lubricating oil tank. The system also includes the aforementioned volatile organic compound vapor treatment equipment. The pulse tube refrigeration device is installed on the lubricating oil tank through the mounting flange, and the condenser is located between the exhaust port and the inlet of the exhaust pipeline. The outlet of the return gas pipeline is connected to the return gas port. The lubricating oil vapor treatment system provided in this application allows for the liquefaction and recycling of lubricating oil vapor as its pressure increases. The vapor enters the condenser of the pulse tube refrigeration unit and comes into full contact with the condenser's condensing fins. The condenser dissipates heat through its cooling fingers, liquefying the lubricating oil vapor and returning it to the lubricating oil tank. This achieves the recovery and reuse of lubricating oil vapor and controls the pressure in the lubricating oil tank, ensuring the normal operation of the lubricating oil. Any unliquefied lubricating oil vapor flows back to the lubricating oil tank through exhaust and return pipes for further condensation and liquefaction. The lubricating oil vapor treatment system provided in this application has a simple structure, and the condenser unit in its condenser can be easily disassembled and replaced, greatly reducing maintenance difficulty and cost. Simultaneously, the lubricating oil vapor is fully treated and will not be emitted into the air, avoiding environmental pollution. Furthermore, thanks to the high-efficiency refrigeration of the pulse tube refrigeration unit and its extremely low-temperature control, the liquefaction and condensation efficiency of the lubricating oil vapor is very high, resulting in high recovery efficiency.

[0015] Preferably, it further includes a control unit, a first air pressure sensor, and a circulating fan. The circulating fan is disposed in the exhaust pipe, and the first air pressure sensor is disposed in the lubricating oil tank. The first air pressure sensor is used to detect the air pressure in the lubricating oil tank and transmit the detected first air pressure data to the control unit. The control unit is used to start the pulse tube refrigerator and the circulating fan when the first air pressure data exceeds a first threshold.

[0016] Preferably, the system further includes a bypass oil circuit and a second pressure sensor. The oil inlet of the bypass oil circuit is connected to the oil outlet of the bypass oil circuit, and the oil outlet of the bypass oil circuit is connected to the top of the condenser via a first oil valve. The second pressure sensor is located at the inlet of the exhaust pipe. The second pressure sensor, the first oil valve, and the pulse tube refrigerator are all signal-connected to the control unit. The control unit is used to receive the first pressure data from the first pressure sensor and the second pressure data from the second pressure sensor. When the ratio of the first pressure data to the second pressure data exceeds a second threshold, the control unit controls the pulse tube refrigerator to stop and controls the first oil valve to open, thereby cleaning the condenser. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the lubricating oil vapor treatment system provided in the embodiments of this application; Figure 2 A schematic diagram of the pulse tube cooling device provided in this application; Figure 3 This is a schematic diagram of the condenser structure in an embodiment of this application; Figure 4 , Figure 5 This is a schematic diagram of the condenser unit structure provided in the embodiments of this application; Figure 6 This is a schematic diagram of the mounting flange structure provided in this application; Figure 7 A schematic diagram of the cold finger structure provided in the embodiments of this application.

[0019] In the diagram: 10. Pulse tube refrigeration unit; 20. Lubricating oil tank; 30. High-pressure oil pump; 41. Oil outlet line; 42. Oil return line; 43. Bypass oil line; 51. Exhaust line; 52. Gas return line; 53. Connection port; 54. Solenoid valve; 60. Circulating fan; 71. First oil valve; 72. Second oil valve; 81. First pressure sensor; 82. Second pressure sensor; 100. Pulse tube refrigerator; 110. Miniature refrigerator; 120. Radiator; 130. Cold finger; 131. First cold finger component; 132. Second cold finger component; 13 3. Cold finger buffer structure; 1311, Cold finger mounting part; 141, First working fluid pipe; 142, Second working fluid pipe; 200, Condenser; 210, Condenser unit; 211, Condenser fin; 2111, First connecting part; 2112, Second connecting part; 2113, Guide hole; 2114, Liquid-repellent surface; 2115, Cooling shaft; 2116, Cooling column; 300, Mounting flange; 310, First mounting flange; 311, First mounting part; 312, Through hole; 313, Second mounting part; 320, Second mounting flange; 400, Connecting reinforcing rod. Detailed Implementation

[0020] In the following description, only certain exemplary embodiments are briefly described. As those skilled in the art will recognize, the described embodiments can be modified in various ways without departing from the spirit or scope of the invention. Therefore, the drawings and description are considered to be exemplary in nature and not restrictive.

[0021] It is important to note that terms such as "first," "second," "symmetric," and "array" are used only to distinguish between descriptive and positional descriptions and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified with terms such as "first" or "symmetric" may explicitly or implicitly include one or more of that feature; similarly, when the quantity of certain features is not limited by words such as "two" or "three," it should be noted that such features also explicitly or implicitly include one or more features. In this invention, unless otherwise explicitly specified and limited, terms such as "installation," "connection," and "fixation" should be interpreted broadly; for example, they can refer to a fixed connection, a detachable connection, or an integral molding; they can refer to a mechanical connection, a direct connection, a welding connection, or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the accompanying drawings and specific circumstances.

[0022] This application provides a lubricating oil vapor treatment system for treating lubricating oil vapor in a lubricating oil station. For example...Figure 1 As shown, the system includes a lubricating oil tank 20, which stores lubricating oil. The lubricating oil tank 20 has an oil outlet and a first return oil port. The oil outlet is connected to an oil outlet pipe 41, which is typically equipped with a high-pressure oil pump 30. The high-pressure oil pump 30 draws lubricating oil from the lubricating oil tank, pressurizes it, and then connects it to equipment requiring lubrication, such as shafts, bearings, and gears in large machinery, through the oil outlet pipe 41. This provides lubrication for the moving parts of the machinery, reducing friction. Simultaneously, it carries away the heat generated by friction and returns the lubricating oil to the lubricating oil tank 20 through the first return oil port via the return oil pipe 42. Because the lubricating oil returning through the return oil pipe 42 is at a relatively high temperature, it heats the lubricating oil upon returning to the lubricating oil tank, causing the lubricating oil to produce more volatile organic compounds (VOCs). When the amount of volatile organic compound (VOC) vapor in the lubricating oil tank 20 increases, the pressure in the tank rises, preventing the lubricating oil in the return oil line 42 from flowing back normally and affecting the normal operation of the lubricating oil station. Therefore, it is necessary to treat the VOC vapor in the lubricating oil tank. Generally, an exhaust port is installed at the top of the lubricating oil tank to discharge the VOC vapor formed by the lubricating oil. Since VOC vapor can pollute the surrounding environment, it needs to be treated to meet emission requirements. One of the most effective treatment methods is cryogenic condensation, which allows the VOC vapor to be reliquefied as a component of the lubricating oil, allowing it to flow back into the lubricating oil tank for reuse. Existing technology uses liquid nitrogen refrigeration for condensation and liquefaction. While this method can effectively condense and liquefy VOCs, the liquid nitrogen refrigeration system is complex, and the recovery of low-concentration VOCs is particularly uneconomical. Meanwhile, the heat transfer between the mixed gas and the refrigerant is indirect. In order to ensure a high recovery rate, a very low operating temperature is required. Therefore, the liquid nitrogen recovery process has low efficiency and high losses. The equipment materials and insulation requirements are strict, which in turn places strict requirements on the equipment performance. The equipment personnel maintenance and operation costs are also very high, and the design cost, installation cost and site requirements are also high.

[0023] Therefore, this application provides a volatile organic compound (VOC) oil vapor treatment device to treat the VOC oil vapor in the lubricating oil tank.

[0024] This application provides a volatile organic compound (VOC) oil and gas treatment device, including a pulse tube refrigeration device 10, an exhaust pipe 51, and a return pipe 52. The pulse tube refrigeration device 10 is mounted on a lubricating oil tank 20 via a mounting flange 300, and the condenser 200 of the pulse tube refrigeration device 10 is positioned between the exhaust port of the lubricating oil tank 20 and the inlet of the exhaust pipe 51. The outlet of the exhaust pipe 51 is connected to the inlet of the return pipe 52, and the outlet of the return pipe 52 is connected to the upper part of the lubricating oil tank.

[0025] The pulse tube cooling device 10 provided in this application embodiment is an extended application of the pulse tube refrigerator. The pulse tube refrigerator is a regenerative cryogenic refrigeration device that utilizes gas pressure wave oscillation to achieve cooling. It is mainly used in space exploration and satellite technology, superconductivity and quantum computing, as well as some high-precision detection equipment, such as high-purity germanium detectors. The pulse tube refrigerator has strong cryogenic cooling capabilities; its cooling finger directly contacts the equipment that needs to be kept at a low temperature, thus enabling objects that need to operate at low temperatures to maintain very low temperatures. The inventors of this application are engaged in the field of cryogenic refrigeration technology. Addressing the various problems existing in the treatment of lubricating oil and gas in existing technologies, they have improved the lubricating oil and gas treatment system by using a pulse tube refrigerator and improving the condenser of the pulse tube refrigerator to condense and liquefy the lubricating oil and gas through contact with it.

[0026] The pulse tube cooling device provided in the embodiments of this application, such as Figure 2As shown, the system includes a pulse tube refrigerator 100 and a condenser 200. In a preferred embodiment of this application, the pulse tube refrigerator includes a micro-refrigerator 110 and a cold finger module. The micro-refrigerator can be a micro-Stirling refrigerator or a micro-thermoelectric refrigerator. In the embodiment provided in this application, a micro-pulse tube refrigerator is preferred. The micro-pulse tube refrigerator is a variant of the micro-Stirling refrigerator and represents a high-end technology in the field of micro-refrigeration, with wide applications in aerospace and high-precision testing. A radiator 120 is also provided on the micro-refrigerator to accelerate its heat dissipation. The cold finger module includes a hot end, a cold end, and a regenerating unit disposed between and connecting the hot and cold ends. It also includes a pulse tube, which is disposed in the middle of the regenerating unit and connects the hot and cold ends. The regenerating unit is arranged in a ring along the outer side of the pulse tube. The pulse tube at the hot end is connected to a first working fluid tube 141, and the regenerating unit at the hot end is connected to a second working fluid tube 142. The working fluid cooled by the micro-refrigeration machine can enter the hot end along the first working fluid tube 141 and then enter the pulse tube, reaching the cold end and entering the regeneration unit, before flowing back to the micro-refrigeration machine from the second working fluid tube 142. Alternatively, the working fluid cooled by the micro-refrigeration machine can enter the hot end along the second working fluid tube 142 and then enter the regeneration unit, reaching the cold end and then entering the pulse tube, before flowing back to the micro-refrigeration machine from the first working fluid tube 141. The cold end is connected to a cold finger 130 made of a material with excellent thermal conductivity, and the cold finger is connected to the condenser. The cold finger can be made of aluminum or aluminum alloy. In a preferred embodiment provided in this application, the cold finger is made of copper, which has excellent thermal conductivity and can fully conduct the heat of the object connected to the cold finger to the cold end of the heat exchanger, achieving sufficient heat exchange.

[0027] The pulse tube refrigeration device provided in this application focuses on improving the condenser 200, enabling the pulse tube refrigeration unit to be used for the condensation and recovery of volatile organic compounds such as lubricating oil vapors. The condenser provided in this application embodiment, such as... Figure 3 , Figure 4 , Figure 5 As shown, it includes a condenser unit 210. The condenser unit 210 is made of a metal material with a thermal conductivity greater than 200, such as aluminum or aluminum alloy. In this embodiment, it is made of copper. Copper has excellent cold (i.e., heat) conductivity and good ductility, and can be made into a flat condenser plate 211. The upper and lower sides of the condenser plate 211 form a first side and a second side, respectively. A first connecting component 2111 is provided at the center of the first side, and a second connecting component 2112 is provided at the center of the second side. The first connecting component 2111 and the second connecting component 2112 can be fitted and fixed. A plurality of flow guide holes 2113 are provided on the condenser plate 211, which penetrate the condenser plate from the first side and reach the second side.

[0028] The condenser provided by the embodiment of the present application can be formed by combining multiple condensation monomers 210. The number of condensation monomers 210 is set according to needs. When the condenser is composed of one condensation monomer, the first connecting component 2111 of the condensation monomer is connected to the cold finger 130 of the pulse tube refrigerator. When the condenser is composed of N condensation monomers, N≥2, where the second connecting component 2112 of the nth condensation monomer is fixedly installed with the first connecting component 2111 of the (n + 1)th condensation monomer; 1≤n<N. An embodiment provided by the present application, as Figure 2 shown, the condenser is composed of twenty condensation monomers, which are sequentially sorted from top to bottom as the first condensation monomer, the second condensation monomer,..., the nineteenth condensation monomer, and the twentieth condensation monomer. Then the first connecting component of the first condensation monomer is fixedly connected to the cold finger of the refrigerator, the first connecting component of the second condensation monomer is connected to the second connecting component of the first condensation monomer, the first connecting component of the third condensation monomer is connected to the second connecting component of the second condensation monomer, and so on until the first connecting component of the twentieth condensation monomer is connected to the second connecting component of the nineteenth condensation monomer. In the embodiment of the present application, the specific structures of the first connecting component and the second connecting component are not limited, mainly to enable detachable connection between the two components. For example, the first connecting component is set as a screw rod with an external thread, and the second connecting component is set as a screw hole with an internal thread. In order to realize the connection between the cold finger and the first connecting component, a threaded hole is provided on the bottom end surface of the cold finger. The condenser provided by the present application can realize a multi-stage adjustable axial length, thereby changing the radial size of the condenser. The condenser provided by the present application can replace a single condensation monomer, realizing multi-stage adjustment and single-stage replacement for maintenance and repair, and solving the problem of difficult maintenance and repair.

[0029] In a preferred embodiment provided by the present application, both the first side surface and the second side surface of the condensation sheet are circular surfaces, the area of the first side surface is smaller than the area of the second side surface, and an inclined liquid drainage surface 2114 is formed from the outer edge of the first side surface to the outer edge of the second side surface. For the condenser provided by the present application, the condensation monomer 210 adopts a circular design, and the diversion hole 2113 also adopts a circular design, which is convenient for processing and production, reduces the processing difficulty of the process, can improve the production efficiency, and reduces the processing cost. At the same time, the liquid drainage surface design can enable the edge to overcome the liquid surface tension when condensing the low-temperature liquid, facilitating the liquid to flow back.

[0030] In a further preferred embodiment, as Figure 6As shown, it also includes a mounting flange 300. The mounting flange is used to install the pulse tube refrigeration device provided in this application at the required location, such as on the exhaust outlet pipe of a liquefied gas storage tank, or on the exhaust pipe of a volatile gas recovery device. The mounting flange includes a first mounting flange 310 and a second mounting flange 320, wherein the first mounting flange 310 includes a first mounting portion 311 with a diameter larger than the diameter of the condenser fin. The first mounting portion 311 is used to install with the exhaust pipe of the liquefied gas storage tank or the exhaust pipe of the volatile gas recovery device, thereby fixing the first mounting flange in the corresponding position and realizing the installation and fixation of the entire pulse tube refrigeration device. A through hole 312 with a diameter larger than the cold finger is provided at the center of the first mounting portion 311. The condenser is located on one side of the first mounting portion 311, and the cold finger 130 starts from the first connecting part of the first condenser unit, passes through the through hole 312, and reaches the other side of the first mounting portion. Along the direction of the through hole 312, the first mounting portion 311 forms a second mounting portion 313 on the side away from the condenser. Therefore, the diameter of the second mounting portion 313 is larger than the cold finger 130 and smaller than the first mounting portion 311. A second mounting flange 320 is provided on one side of the second mounting portion 313 of the first mounting flange 310. The cold finger heat exchange module is installed inside the second mounting flange 320, and the second mounting flange 320 is connected to the second mounting portion 313 of the first mounting flange 310. The mounting flange 300 provided in this embodiment is made of a material with a thermal conductivity of less than 1, such as polytetrafluoroethylene (PTFE), modified PTFE, or fiberglass. This satisfies the thermal conductivity requirements, effectively isolating the cold finger from the external environment for better insulation, and also meets the material strength requirements for operation in low-temperature environments.

[0031] The pulse tube refrigeration device provided in this embodiment features a condenser composed of condensing units, each with a guide hole 2113. When the pulse tube refrigeration device is installed onto the exhaust pipe of a liquefied gas storage tank or a volatile gas recovery pipe via the first mounting part of the first mounting flange, the gas enters the condenser along the exhaust pipe or recovery pipe, contacts the condensing fins, and then enters the condenser along the guide holes, making full contact with the multi-stage condensing fins. The condensing fins are all heat-connected to the cooling pipe, thus absorbing heat from the gas and rapidly cooling and liquefying it. The liquefied liquid can then flow back into the liquefied gas storage tank or into the volatile gas storage device itself under gravity, achieving liquefaction recovery. This also allows for pressure control within the liquefied gas storage tank, ensuring the pressure meets operational requirements.

[0032] In a preferred embodiment of this application, a cooling shaft 2115 protruding from the first side surface of the condenser is provided at the center of the first side surface of the condenser. The cooling shaft 2115 is configured as a regular polygonal prism or cylinder, and the first connecting component is disposed on the cooling shaft 2115. A cooling column 2116 protruding from the second side surface of the condenser is provided at the center of the second side surface of the condenser. The cooling column 2116 is configured as a regular polygonal prism or cylinder, and the radii of the cooling shaft 2115 and the cooling column 2116 are the same. By providing the cooling shaft and cooling column, the contact area between the condenser and the cooling finger is increased, as is the contact area between each condenser unit. This is more conducive to the cooling finger fully transferring the heat in the condenser to the pulse tube refrigerator, allowing the condenser to maintain a temperature at which the gas can be fully liquefied. Meanwhile, when multiple condensing units are assembled through the first connecting component and the second connecting component to form a condenser with multiple condensing units, the combination of the cooling shaft and the cooling column forms an isolation step between each condensing unit, thereby forming a condensation space between each condensing unit. This allows the gas to come into more full contact with the condenser, and the gas can be cooled more fully under the action of each stage of condensing units, thus achieving liquefaction.

[0033] In a preferred embodiment of this application, at least two layers of guide holes 2113 are provided outward from the center of the condenser plate. Each layer of guide holes includes at least three guide holes 2113, and all guide holes in each layer are arranged at equal intervals with the center of the condenser plate as the distribution center. That is, the guide holes are arranged in a circular array with the center of the condenser plate as the distribution center. In a specific embodiment of this application, four layers of guide holes are provided on each condenser plate unit. When multiple condenser units are assembled, the guide holes on each condenser unit together form a guide channel for gas flow. A connecting reinforcement is also included, which is made of a material with a thermal conductivity of less than 1; the first end of the connecting reinforcement is fixedly installed to the mounting flange, and the second end of the connecting reinforcement is fixedly installed to the first condenser unit. In one embodiment of this application, the connecting reinforcement includes at least three connecting reinforcement rods 400. The first and second ends of each connecting reinforcement rod are provided with external threads. The bottom of the first mounting portion 311 of the mounting flange 300 has at least three threaded holes spaced at equal intervals, with the bottom center as the distribution center. The distance between the threaded holes and the bottom center of the first mounting portion is equal to the distance between one layer of guide holes on the condenser fin and the center of the condenser fin. The connecting reinforcement also includes nuts matching the number of connecting reinforcement rods. The first end of each connecting reinforcement rod is fixed to the threaded hole via the external thread. The second end of each connecting reinforcement rod passes through a guide hole on the first condenser unit and is fixed to the first condenser unit via the nut. In a preferred embodiment of this application, the connection between the condenser and the mounting flange is strengthened by providing connecting reinforcement rods. Thus, when the condenser has multiple stages of condenser units, the weight of the condenser increases, and the connecting force provided by the cold fingers alone may not be sufficient to support the vertical installation of the entire condenser. Therefore, adding connecting reinforcement rods to fix the condenser can enhance the stability of the condenser and support the assembly of more stages of condenser units, achieving better condensation performance. The connecting reinforcement rod is made of a material with a thermal conductivity of less than 1 and low temperature resistance, such as polytetrafluoroethylene (PTFE) or modified PTFE. This satisfies the structural strength requirements under low temperature conditions while reducing the amount of external heat transferred into the condenser by the connecting reinforcement rod, thus minimizing its impact on the condenser's condensation efficiency.

[0034] In a preferred embodiment provided in this application, such as Figure 7As shown, the cold finger 130 includes a first cold finger component 131, a second cold finger component 132, and a cold finger buffer structure 133. The first end of the first cold finger component 131 is provided with a cold finger mounting portion 1311, which is used for installation and fixation with the cold end of the cold finger module. The second end of the first cold finger component 131 is connected to the cold finger buffer structure 133. The first end of the second cold finger component 132 is connected to the cold finger buffer structure 133, and the second end of the second cold finger component 132 is provided with a second connecting component, which is used for installation and fixation with the first connecting component on the first condenser unit. The first cold finger component, the cold finger buffer structure, and the second cold finger component are integrally formed. In a preferred embodiment provided in this application, the cold finger buffer structure consists of multiple cylindrical rods fixedly connected to the first and second cold finger components. When a certain vibration occurs at the installation location of the pulse tube refrigeration device provided in this application, it will cause the mounting flange to vibrate, and consequently, the pulse tube refrigeration unit installed on the mounting flange will vibrate. Because of the cold finger buffer structure, the vibration transmitted from the mounting flange to the condenser will be slowed down, avoiding excessive impact on the condenser.

[0035] In the preferred embodiments provided in this application, such as Figure 1The exhaust pipe 51 is provided with a first outlet and a second outlet, wherein the second outlet is connected to the inlet of the return gas pipe 52. A connection port 53 and a solenoid valve 54 are provided at the first outlet of the exhaust pipe 51. The connection port 53 can be connected to a gas supply pipe, and the solenoid valve 54 controls the connection between the exhaust pipe 51 and the gas supply pipe. During normal operation of the lubricating oil vapor recovery treatment system provided in this application, the solenoid valve 54 is closed, and the exhaust pipe 51 is connected to the return gas port on the side wall of the lubricating oil tank through the return gas pipe 52. Simultaneously, a circulating fan 60 is provided on the exhaust pipe 51, which facilitates the return of volatile organic compounds (VOCs) from the lubricating oil tank to the lubricating oil tank 20 after passing through the condenser 200, exhaust pipe 51, and return gas pipe 52. In this process, most of the volatile organic compounds (VOCs) are liquefied by the condenser and fall directly back into the lubricating oil tank. The remaining unliquefied VOCs, along with other gases such as carbon dioxide and nitrogen produced by the decomposition of the lubricating oil, and air carried in during the circulation process, will flow back into the lubricating oil tank. When the VOCs in the lubricating oil tank become very low after multiple cycles, they can be discharged through the first outlet of the exhaust pipe connected to the gas supply pipe for further treatment. This can be achieved by filtering the gas or introducing it into an organic solvent, dissolving a small amount of VOCs in the solvent, while the remaining gases, such as carbon dioxide and nitrogen, can be released into the air or further processed. This process effectively recovers the beneficial components from the VOCs, replenishes the lubricating oil, and prevents rapid consumption. Simultaneously, it vents the lubricating oil tank, preventing excessive pressure from affecting the normal return flow of the lubricating oil.

[0036] In a further preferred embodiment of the lubricating oil vapor treatment system provided in this application, a control unit and a first pressure sensor 81 are also included. The first pressure sensor 81 is disposed inside the lubricating oil tank 20. The first pressure sensor 81 is used to detect the pressure inside the lubricating oil tank and transmit the detected first pressure data to the control unit. The control unit is used to start the pulse tube refrigerator 100 and then start the circulating fan 60 when the first pressure data exceeds a first threshold. The lubricating oil vapor treatment system provided in this application detects the pressure in the lubricating oil tank 20 through the first pressure sensor 81. When the pressure value exceeds the first threshold, the high pressure inside will affect the normal operation of the lubricating oil station. At this time, the pulse tube refrigerator can be started to operate, so that the pulse tube refrigeration device provided in this application generates low temperature and removes the heat in the condenser through the cold finger, so that the temperature of the condenser is lower than the liquefaction temperature of the volatile organic compound oil vapor. The volatile organic compound oil vapor around the condenser liquefies after sufficient contact with the condenser and falls back into the lubricating oil tank along the condenser fins. At this time, the air pressure around the condenser decreases, and the surrounding volatile organic compounds (VOCs) move towards the condenser, achieving liquefaction and recovery of the VOCs. The circulating fan accelerates the flow of these VOCs, allowing them to contact the condenser and liquefy more quickly. In the preferred embodiment provided in this example, automated control of the pulse tube refrigerator and circulating fan is achieved without manual monitoring, saving labor costs and avoiding the need for continuous operation of the pulse tube refrigerator and circulating fan, thus preventing energy waste. The first threshold can be set based on past experience or actual detection conditions.

[0037] The further improved scheme of the lubricating oil vapor treatment system provided in this application also includes a bypass oil circuit 43 and a second pressure sensor 82. The oil inlet of the bypass oil circuit 43 is connected to the oil outlet pipe 41, and the oil outlet of the bypass oil circuit 43 is connected to the top of the condenser through a first oil valve 71. The oil outlet of the bypass oil circuit 43 is also connected to a second return port provided on the lubricating oil tank through the second oil valve 72. The second pressure sensor 82 is located at the inlet of the exhaust pipe. The second pressure sensor 82, the first oil valve, and the pulse tube refrigerator are all signal-connected to the control unit. The control unit is used to receive the first pressure data from the first pressure sensor and the second pressure data from the second pressure sensor. When the ratio of the first pressure data and the second pressure data exceeds a second threshold, it controls the pulse tube refrigerator to stop and controls the first oil valve to open, thereby cleaning the condenser. The second threshold can be set based on past experience or based on actual detection conditions. In one embodiment of this application, the second threshold is 10, meaning the air pressure at the first pressure sensor is 10 times the air pressure at the second pressure sensor. In a preferred embodiment, a bypass oil circuit is provided and connected to the top of the condenser. When the condenser is working normally, the air pressure values ​​at the first and second sensors are roughly equivalent. However, because the condenser can reach very low temperatures during operation, volatile organic compounds (VOCs) condense and fall back onto the condenser fins, potentially condensing there and affecting the smooth flow of VOCs. When the circulating fan is operating, the second sensor experiences a negative pressure, significantly increasing the ratio of the first to the second air pressure. Therefore, when the ratio of the first to the second air pressure is greater than the second threshold, it indicates that a large amount of organic matter has condensed on the condenser fins. At this point, the pulse tube refrigerator stops operating, and the first oil valve opens, allowing lubricating oil from the bypass oil circuit to flow into the condenser. Because the lubricating oil in the bypass oil circuit is at its normal operating temperature, which is much higher than the condenser's operating temperature and also much higher than the melting temperature of the organic matter condensed on the condenser fins, the organic matter condensed on the condenser fins will melt again and fall back into the lubricating oil tank, thus cleaning the condenser. This restores the condenser's ability to liquefy and recover volatile organic compounds. Simultaneously, when the lubricating oil station stops working, the bypass oil circuit can return the lubricating oil in the outlet line to the lubricating oil tank through the second return port.

[0038] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any person skilled in the art can easily conceive of various variations or substitutions within the technical scope disclosed in the present invention, and these should all be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be determined by the scope of the claims.

Claims

1. A lubricating oil vapor treatment system, characterized in that, The system includes a lubricating oil tank, an oil outlet pipe, and an oil return pipe. The oil outlet pipe is connected to the oil outlet of the lubricating oil tank, and the oil return pipe is connected to the first oil return port of the lubricating oil tank. The top of the lubricating oil tank is provided with an exhaust port, and the upper part of the side wall of the lubricating oil tank is provided with a vent. The system also includes a volatile organic compound (VOC) oil vapor treatment device, which includes a pulse tube cooling device, an exhaust pipe, and a vent. The pulse tube refrigeration device includes a condenser, a mounting flange, and a pulse tube refrigerator. The condenser includes at least one condensing unit, which is made of a metal material with a thermal conductivity greater than 200. The condensing unit includes a flat condensing plate, with a first side and a second side formed on its upper and lower sides, respectively. A first connecting component is provided at the center of the first side, and a second connecting component is provided at the center of the second side. The first and second connecting components can be fitted together for installation and fixation. A plurality of flow guide holes are provided on the condensing plate, extending from the first side through the condensing plate to the second side. The pulse tube refrigerator is mounted on the mounting flange, and the cooling finger of the pulse tube refrigerator is fixedly connected to the first connecting component of the first condensing unit in the condenser. The pulse tube refrigeration device is mounted on the lubricating oil tank via the mounting flange, and the condenser is positioned between the exhaust port and the inlet of the exhaust pipe. The outlet of the exhaust pipe is connected to the inlet of the return gas pipe, and the outlet of the return gas pipe is connected to the return gas port.

2. The lubricating oil vapor treatment system as described in claim 1, characterized in that, The first and second sides of the condenser plate are both circular surfaces. The area of ​​the first side is smaller than that of the second side, and an inclined hydrophobic surface is formed from the outer edge of the first side to the outer edge of the second side.

3. The lubricating oil vapor treatment system as described in claim 1 or 2, characterized in that, A cooling guide shaft protruding from the surface of the first side of the condenser is provided at the center of the first side of the condenser, and the first connecting component is provided on the cooling guide shaft; a cooling guide column protruding from the surface of the second side of the condenser is provided at the center of the second side of the condenser, and the second connecting component is provided on the cooling guide column.

4. The lubricating oil vapor treatment system as described in claim 3, characterized in that, Both the cooling shaft and the cooling column are cylindrical, and the cooling shaft and the cooling column have the same radius.

5. The lubricating oil vapor treatment system as described in claim 4, characterized in that, It includes N condenser units, where N≥2, and the second connecting component of the nth condenser unit is fixedly installed with the first connecting component of the (n+1)th condenser unit; 1≤n <N。 6. The lubricating oil vapor treatment system as described in claim 5, characterized in that, It also includes a connecting reinforcement, which is made of a material with a thermal conductivity of less than 1; the first end of the connecting reinforcement is fixedly installed to the mounting flange, and the second end of the connecting reinforcement is fixedly installed to the first condenser unit.

7. The lubricating oil vapor treatment system as described in claim 6, characterized in that, The connecting reinforcement includes at least three connecting reinforcement rods. The first and second ends of each connecting reinforcement rod are provided with external threads. The bottom of the mounting flange is provided with at least three threaded holes at equal intervals, with the bottom center as the distribution center. The distance between the threaded holes and the bottom center of the mounting flange is equal to the distance between one layer of guide holes on the condenser fin and the center of the condenser fin. The connecting reinforcement also includes nuts matching the number of connecting reinforcement rods. The first end of each connecting reinforcement rod is fixed to the threaded hole through the external thread. The second end of each connecting reinforcement rod passes through a guide hole on the first condenser unit and is fixed to the first condenser unit through the nuts.

8. The lubricating oil vapor treatment system as described in claim 7, characterized in that, It also includes a control unit, a first air pressure sensor, and a circulating fan. The circulating fan is installed in the exhaust pipe, and the first air pressure sensor is installed in the lubricating oil tank. The first air pressure sensor is used to detect the air pressure in the lubricating oil tank and transmit the detected first air pressure data to the control unit. The control unit is used to start the pulse tube refrigerator and start the circulating fan when the first air pressure data exceeds a first threshold.

9. The lubricating oil vapor treatment system as described in claim 8, characterized in that, It also includes a bypass oil circuit and a second pressure sensor. The oil inlet of the bypass oil circuit is connected to the oil outlet of the bypass oil circuit, and the oil outlet of the bypass oil circuit is connected to the top of the condenser through a first oil valve. The second pressure sensor is located at the inlet of the exhaust pipe. The second pressure sensor, the first oil valve, and the pulse tube refrigerator are all signal-connected to the control unit. The control unit is used to receive the first pressure data from the first pressure sensor and the second pressure data from the second pressure sensor. When the ratio of the first pressure data and the second pressure data exceeds a second threshold, it controls the pulse tube refrigerator to stop and controls the first oil valve to open, thereby cleaning the condenser.

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