Efficient energy-saving natural gas processing device

Abstract

The invention relates to the technical field of natural gas processing equipment, in particular to an efficient and energy-saving natural gas processing device which comprises a liquid cooling assembly and a natural gas pipeline, the liquid cooling assembly comprises a cold box arranged on a base, a metal cold box and a condenser are arranged on the upper portion and the lower portion of the inner wall of the cold box, and a gas inlet pipeline of the cold box communicates with the interior of the natural gas pipeline; the efficient energy-saving assembly comprises a compressed air assembly, a cold air utilization assembly, a cold air conveying assembly, a hot air conveying assembly and a cold air heat preservation assembly. Therefore, the device is reasonable in structure, exhausted cold air can be efficiently recycled, the problem of cold source emission is effectively solved, accurate separation of cold air and hot air is achieved through a fine secondary treatment process, in the process, the treated cold air can replace part of the refrigerating function of a condenser and a refrigerant, energy is saved, emission is reduced, and the energy-saving and environment-friendly effects are achieved. And the refrigerating efficiency is greatly improved, the treated hot air can meet the heating requirement of related high-temperature equipment, energy conservation and efficiency improvement of the heating equipment are achieved, and the overall application performance is excellent.

Description

Technical Field

[0001] The present invention relates to the technical field of natural gas processing equipment, and in particular to a high-efficiency and energy-saving natural gas processing device. Background Art

[0002] The natural gas liquefaction process is a highly sophisticated and efficient energy conversion process. In this process, natural gas is first transported to a dedicated cold box. This closed and low-temperature environment undergoes a crucial condensation stage for the natural gas. This stage relies on the efficient operation of the condenser and the recycling of a large amount of refrigerant. As an excellent heat transfer medium, the refrigerant effectively absorbs the heat of the natural gas and significantly reduces its temperature to a liquefied state.

[0003] However, in the process of liquefying natural gas, a certain amount of cold air will inevitably accumulate inside the cold box. This cold air contains a large amount of underutilized cold energy. In order to ensure that the pressure and temperature in the cold box remain stable and to ensure the continuity and safety of the liquefaction process, this cold air needs to be discharged regularly through the pressure reducing valve. Although this step is crucial to the entire liquefaction process, it also causes a significant problem: serious waste of cold sources. In the process of releasing the cold air through the pressure reducing valve, the air containing cold energy is not reasonably utilized, resulting in a huge waste of resources. Summary of the invention

[0004] The present invention aims to solve one of the technical problems in the related art at least to a certain extent.

[0005] To this end, the purpose of the present invention is to propose an efficient and energy-saving natural gas processing device. The present invention has a reasonable structure and can efficiently recycle and utilize the exhausted cold air, effectively solving the problem of cold source emissions. Through a sophisticated secondary treatment process, accurate separation of cold and hot air is achieved. In this process, the treated cold air can replace part of the refrigeration function of the condenser and the refrigerant, which not only saves energy and reduces emissions, but also greatly improves the refrigeration efficiency. The treated hot air can meet the heating needs of related high-temperature equipment, achieving energy saving and efficiency improvement of the heating equipment, and the overall application performance is excellent.

[0006] To achieve the above object, the present invention proposes a high-efficiency and energy-saving natural gas processing device, comprising: Liquid cooling assembly: comprising a cold box arranged on a base, wherein a metal cold box and a condenser are arranged on the upper and lower inner walls of the cold box, a first exhaust valve is arranged on the surface of the exhaust pipe of the cold box, and an air intake pipe of the cold box is connected to the inside of the natural gas pipeline; High-efficiency energy-saving components: including compressed air components, cold air utilization components, cold air delivery components, hot air delivery components and cold air insulation components, the compressed air components are arranged on the base and located on one side of the cold box, the cold air utilization components are arranged on the cold exhaust pipe, one end of the cold air utilization components is connected to the cold exhaust pipe, and the other end of the cold air utilization components is connected to the compressed air components, the first cooling pipe in the low-temperature separation component, the second cooling pipe in the deacidification component and the third cooling pipe in the dehydration component are respectively arranged on the cold air utilization components, the cold air delivery components are arranged on the compressed air components, and the cold air One end of the air delivery component is connected to the compressed air component, and the other end of the cold air delivery component is connected to the cold air utilization component. The hot air delivery component and the cold air insulation component are respectively arranged on the cold air delivery component. One end of the hot air delivery component is connected to the cold air delivery component, and the other end of the hot air delivery component is connected to the compressed air component. The temperature control pipe in the desulfurization component and the high temperature pipe in the deacidification component are respectively arranged on the hot air delivery component. One end of the cold air insulation component is connected to the cold air delivery component, and the other end of the cold air insulation component passes through the interior of the cold box and is connected to the metal cold box.

[0007] In addition, the high-efficiency and energy-saving natural gas processing device proposed in the application may also have the following additional technical features: Specifically, the compressed air component includes a frame, an air collecting box, an air compressor and an air storage box. The frame is fixedly connected to the base and is located on one side of the cold box. The air collecting box, the air compressor and the air storage box are fixedly connected to the inner wall of the frame in sequence along the vertical direction. One end of the cold air utilization component and the hot air gas transmission component respectively penetrate into the interior of the frame and are connected to the air inlet end arranged on the surface of the air collecting box. The air inlet end of the air compressor is connected to the interior of the air collecting box, and the exhaust end of the air compressor is connected to the interior of the air storage box, wherein a valve is provided on the exhaust end of the air compressor, and the air storage box is connected to one end of the cold air gas transmission component.

[0008] Specifically, the cold air utilization component includes a first three-way pipe, a first ventilation pipe, a second ventilation pipe and a third ventilation pipe. The first three-way pipe is fixedly connected to the surface of the cooling exhaust pipe, the air inlet end of the first three-way pipe is connected to the cooling exhaust pipe, one group of exhaust ends of the first three-way pipe is connected to the air inlet end of the first cooling pipe in the low-temperature separation component through the first ventilation pipe, the other group of exhaust ends of the first three-way pipe is connected to one end of the cold air delivery component, the exhaust end of the first cooling pipe in the low-temperature separation component is respectively connected to the air inlet end of the second cooling pipe in the deacidification component and the third cooling pipe in the dehydration component through the second ventilation pipe, and the exhaust ends of the second cooling pipe in the deacidification component and the third cooling pipe in the dehydration component are respectively connected to the air inlet end on the surface of the air collecting box through the third ventilation pipe.

[0009] Specifically, a central connecting pipe is respectively connected between the second cooling pipe and the second ventilation pipe and the third ventilation pipe in the deacidification assembly, and a second three-way pipe is respectively arranged on the surface of the two groups of the central connecting pipes. The air intake ends and one group of the exhaust ends of the two groups of the second three-way pipes are respectively connected to the inside of the two groups of the central connecting pipes, and the other group of the exhaust ends of the two groups of the second three-way pipes are respectively connected to the air intake end and the exhaust end in the low-temperature pipe in the deacidification assembly.

[0010] Specifically, a second exhaust valve is provided on the surface of the intermediate connecting pipe respectively connected to the third ventilation pipe and the second cooling pipe, and the second exhaust valve is located between one group of exhaust ends of the third ventilation pipe and the exhaust end of the second cooling pipe.

[0011] Specifically, the cold air delivery component includes an exhaust pipe seat, a third exhaust valve, a vortex tube, a cold air pipeline, a fourth exhaust valve, a first temperature sensor, a cold air collecting box and a fifth exhaust valve, the exhaust pipe seat is fixedly connected to the surface of the air storage box and is communicated with the interior of the air storage box, one end of the exhaust pipe seat passes through the outside of the frame and is connected to the air inlet end of the vortex tube, the third exhaust valve is arranged on the surface of one end of the exhaust pipe seat passing through the outside of the frame, the cold air pipeline is fixedly connected to the surface of the cold box, one end of the cold air pipeline is connected to the cold air end of the vortex tube, and the other end of the cold air pipeline is connected to one group of exhaust ends of the first three-way pipe, the fourth exhaust valve, the first temperature sensor and the cold air collecting box are arranged on the cold air pipeline in sequence, the fifth exhaust valve is arranged on the surface of the first three-way pipe and corresponds to the position of the cold air pipeline, the hot air end of the vortex tube is connected to the hot air delivery component, and the cold air insulation component is arranged on the cold air collecting box.

[0012] Specifically, the hot air transmission component includes a third three-way pipe, a switching valve, a hot air pipeline, a middle pipe, a return air pipe and a second temperature sensor. The third three-way pipe is fixedly connected to the hot air end surface of the vortex tube, the switching valve is arranged on the surface of the third three-way pipe, the hot air pipeline is fixedly connected to the surface of the cold box and is located on one side of the bottom of the cold air pipeline, one end of the hot air pipeline is connected to one group of exhaust ends of the third three-way pipe, and the other end of the hot air pipeline is connected to the air inlet end of the temperature control pipe in the desulfurization component, the middle pipe is fixedly connected to the surface of the cold box, one end of the middle pipe is connected to the exhaust end of the temperature control pipe in the desulfurization component, and the other end of the middle pipe is connected to the air inlet end of the high-temperature pipe in the deacidification component, the return air pipe is fixedly connected to the surface of the cold box, one end of the return air pipe is connected to the exhaust end of the high-temperature pipe in the deacidification component, the other end of the return air pipe passes through the interior of the frame and is connected to the air inlet end arranged on the surface of the air collecting box, and the second temperature sensor is arranged on the surface of the hot air pipeline.

[0013] Specifically, another set of exhaust ends of the third three-way pipe is connected to the air inlet end of the natural gas drying component.

[0014] Specifically, a metal heat sink is arranged on the surface of the return air pipe.

[0015] Specifically, the cold air insulation component includes a circulating air pump, a first delivery pipe and a second delivery pipe. The circulating air pump is fixedly connected to the top of the cold air collecting box, the air inlet end of the circulating air pump is connected to the interior of the cold air collecting box, the exhaust end of the circulating air pump is connected to the interior of the air inlet end of the first delivery pipe, the exhaust end of the first delivery pipe passes through the interior of the cold box and is connected to the interior of the air inlet end of the metal cold box, the exhaust end of the metal cold box is connected to the interior of the air inlet end of the second delivery pipe, and the exhaust end of the second delivery pipe is connected to the interior of the cold air collecting box.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention.

[0017] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention has a reasonable structure and can efficiently recycle and utilize the exhausted cold air, effectively solving the problem of cold source emission. Through a sophisticated secondary treatment process, the accurate separation of cold and hot air is achieved. In this process, the treated cold air can replace the refrigeration function of part of the condenser and the refrigerant, which not only saves energy and reduces emissions, but also greatly improves the refrigeration efficiency. The treated hot air can meet the heating needs of related high-temperature equipment, realizing energy saving and efficiency improvement of heating equipment, and the overall application performance is excellent; 2. The present invention is provided with a liquid cooling component, a compressed air component and a cold air utilization component, wherein the cold air utilization component is responsible for collecting the cold air released by the liquid cooling component, and sequentially introducing it into the first cooling tube of the low-temperature separation component, the second cooling tube of the deacidification component, the third cooling tube of the dehydration component, and finally into the air collecting box of the compressed air component. During the cold air transmission process, the transmission distance is precisely controlled to achieve fine adjustment of the cold air temperature: ensure that the temperature of the gas entering the first cooling tube reaches -100°C, the temperature of the gas entering the second and third cooling tubes is maintained between -40°C and -20°C, and the gas entering the air collecting box is heated to 20°C. This design accurately meets the different temperature requirements of low-temperature separation, deacidification, dehydration and room temperature storage. By recycling and efficiently utilizing cold air in various low-temperature processing equipment, it not only significantly saves energy, but also improves the refrigeration efficiency, showing excellent application results; 3. The present invention further adds a cold air delivery component, which works in conjunction with the compressed air component to efficiently convert room temperature air into cold air and hot air, perfectly adapting to the needs of subsequent low-temperature and high-temperature processing equipment, achieving significant energy-saving effects, and optimizing the refrigeration and heating efficiency respectively, showing excellent application performance. Specifically, the compressed air component first compresses the room temperature air in the collection box into high-pressure gas, and then the cold air delivery component takes over this process to finely separate the high-pressure gas into two parts, cold air and hot air. Among them, the cold air part is connected to the cold air utilization component to ensure that when the liquid cooling component does not directly discharge cold air, it can seamlessly switch to using the treated cold air as a cold source, continuously providing the necessary cooling effect for each low-temperature processing equipment, and the separated hot air is directly supplied to each high-temperature processing equipment as an efficient heat source. This design not only improves the efficiency of resource utilization, but also ensures that the temperature requirements of each processing link are accurately met, and the overall use effect is extremely outstanding; 4. The present invention innovatively introduces a hot air delivery component, which has the ability to accurately distinguish the temperature of hot air and can accurately deliver hot air to the high-temperature processing equipment corresponding to the demand according to the temperature range. Specifically, hot air in the range of 40°C to 80°C is accurately distributed to the temperature control pipe and the high-temperature pipe, which is specially used for desulfurization and deacidification processes to ensure that these chemical reactions are carried out efficiently under suitable temperature conditions, while hot air with a temperature exceeding 80°C is delivered to the natural gas drying component, which is specially used for natural gas drying. Through this precise distribution with clear temperature, not only the utilization efficiency of hot air is improved, but also the operation effect of each high-temperature processing equipment is significantly improved, and the overall application effect is remarkable; 5. The present invention is also innovatively equipped with a cold air insulation component, which can circulate and transport low-temperature cold air with a temperature of about -168°C into the metal cold box. Through the efficient thermal conductivity of the metal cold box, the interior of the cold box can be quickly cooled down. This design effectively replaces the refrigeration function of part of the condenser and the refrigerant, which not only greatly saves energy consumption, but also significantly improves the refrigeration efficiency inside the cold box. Overall, this innovative design is not only energy-saving and environmentally friendly, but also significantly optimizes the use effect of the cold box and demonstrates excellent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which: Figure 1 This is a schematic diagram of the structure of a high-efficiency and energy-saving natural gas processing device of the present invention; Figure 2 This is a schematic diagram of the structure of a liquid cooling component in a high-efficiency and energy-saving natural gas processing device of the present invention; Figure 3This is a schematic diagram of the structure of a compressed air component in a high-efficiency and energy-saving natural gas processing device of the present invention; Figure 4 This is a schematic diagram of the structure of a cold air utilization component in a high-efficiency and energy-saving natural gas processing device of the present invention; Figure 5 This is a schematic diagram of the structure of a hot air gas transmission component in a high-efficiency and energy-saving natural gas processing device of the present invention; Figure 6 The present invention is a schematic diagram of the structure of a cooling air insulation component in a high-efficiency and energy-saving natural gas processing device.

[0019] As shown in the figure: 101, liquid cooling assembly; 100, base; 10, cold box; 11, metal cold box; 12, condenser; 13, exhaust pipe; 14, first exhaust valve; 15, air intake pipe; 16, natural gas pipeline; 202. High-efficiency energy-saving components; 21. Compressed air components; 22. Cold air utilization components; 23. Cold air transmission components; 24. Hot air transmission components; 25. Cold air insulation components; 50, first cooling tube; 60, second cooling tube; 61, low temperature tube; 62, high temperature tube; 70, third cooling tube; 80, temperature control tube; 210, frame; 211, air collecting box; 212, air compressor; 213, air storage box; 221, first three-way pipe; 222, first ventilation pipe; 223, second ventilation pipe; 224, third ventilation pipe; 225, middle connecting pipe; 226, second three-way pipe; 2251, second exhaust valve; 231, exhaust pipe seat; 232, third exhaust valve; 233, vortex tube; 234, cold air pipeline; 235, fourth exhaust valve; 236, first temperature sensor; 237, cold air box; 238, fifth exhaust valve; 241, third three-way pipe; 242, switching valve; 243, hot gas pipeline; 244, middle pipe; 245, return air pipe; 246, second temperature sensor; 200, natural gas drying component; 247, metal radiator; 251. Circulating air pump; 252. First delivery pipeline; 253. Second delivery pipeline. DETAILED DESCRIPTION

[0020] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and are not to be construed as limitations of the present invention. On the contrary, embodiments of the present invention include all changes, modifications and equivalents that fall within the spirit and connotation of the appended claims.

[0021] A high-efficiency and energy-saving natural gas processing device according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0022] like Figure 1-Figure 6 As shown, a high-efficiency and energy-saving natural gas processing device according to an embodiment of the present invention comprises: Liquid cooling assembly 101: includes a cold box 10 disposed on a base 100, a metal cold box 11 and a condenser 12 are disposed on the inner wall of the cold box 10, a first exhaust valve 14 is disposed on the surface of a cold exhaust pipe 13 of the cold box 10, and an air intake pipe 15 of the cold box 10 is connected to the inside of a natural gas pipeline 16; High-efficiency energy-saving component 202: includes compressed air component 21, cold air utilization component 22, cold air delivery component 23, hot air delivery component 24 and cold air insulation component 25. The compressed air component 21 is arranged on the base 100 and is located on one side of the cold box 10. The cold air utilization component 22 is arranged on the cold exhaust pipe 13. One end of the cold air utilization component 22 is connected to the cold exhaust pipe 13, and the other end of the cold air utilization component 22 is connected to the compressed air component 21. The first cooling pipe 50 in the low-temperature separation component, the second cooling pipe 60 in the deacidification component and the third cooling pipe 70 in the dehydration component are respectively arranged on the cold air utilization component 22, and the cold air delivery component 23 is arranged on the compressed air component 21. One end of the cold air delivery component 23 is connected to the compressed air component 21, and the other end of the cold air delivery component 23 is connected to the cold air utilization component 22. The hot air delivery component 24 and the cold air insulation component 25 are respectively arranged on the cold air delivery component 23, one end of the hot air delivery component 24 is connected to the cold air delivery component 23, and the other end of the hot air delivery component 24 is connected to the compressed air component 21. The temperature control pipe 80 in the desulfurization component and the high temperature pipe 62 in the deacidification component are respectively arranged on the hot air delivery component 24, one end of the cold air insulation component 25 is connected to the cold air delivery component 23, and the other end of the cold air insulation component 25 passes through the interior of the cold box 10 and is connected to the metal cold box 11.

[0023] It should be noted that the interior of the cold box 10 is separated by a partition, and air holes are opened on the surface of the partition. The metal cold box 11 is fixed on the top of the partition, and the air inlet duct 15 and the condenser 12 are arranged at the bottom of the partition.

[0024] Specifically, the present invention has a reasonable structure and can efficiently recycle and utilize the exhausted cold air, effectively solving the problem of cold source emission. Through a sophisticated secondary treatment process, accurate separation of hot and cold air is achieved. In this process, the treated cold air can replace part of the refrigeration function of the condenser 12 and the refrigerant, which not only saves energy and reduces emissions, but also greatly improves the refrigeration efficiency. The treated hot air can meet the heating needs of related high-temperature equipment, achieving energy saving and efficiency improvement of the heating equipment, and the overall application performance is excellent. The present invention is provided with a liquid cooling component 101, a compressed air component 21 and a cold air utilization component 22, wherein the cold air utilization component 22 is responsible for collecting the cold air released by the liquid cooling component 101, and sequentially introducing it into the first cooling pipe 50 of the low-temperature separation component and the deacidification component. The second cooling tube 60 of the dehydration component, the third cooling tube 70 of the dehydration component, and finally the air collecting box 211 that enters the compressed air component 21. During the cold air transmission process, the transmission distance is precisely controlled to achieve fine adjustment of the cold air temperature: ensure that the gas temperature entering the first cooling tube 50 reaches -100°C, the gas temperature entering the second and third cooling tubes 70 is maintained between -40°C and -20°C, and the gas entering the air collecting box 211 is heated to 20°C. This design accurately meets the different temperature requirements of low-temperature separation, deacidification, dehydration and room temperature storage. By recycling and efficiently utilizing cold air in various low-temperature processing equipment, it not only significantly saves energy, but also improves the refrigeration efficiency, showing excellent application results. A cold air delivery component 23 is further added, which works in conjunction with the compressed air component 21 and can efficiently convert room temperature air into cold air and hot air, perfectly adapting to the needs of subsequent low-temperature and high-temperature processing equipment, achieving significant energy-saving effects, and optimizing the cooling and heating efficiency respectively, showing excellent application performance. Specifically, the compressed air component 21 first compresses the room temperature air in the air collecting box 211 into high-pressure gas, and then the cold air delivery component 23 takes over this process and finely separates the high-pressure gas into two parts, cold air and hot air. Among them, the cold air part is connected to the cold air utilization component 22 to ensure that when the liquid cooling component 101 does not directly discharge cold air, it can seamlessly switch to using the treated cold air as The cold source continuously provides the necessary cooling effect for each low-temperature processing equipment, while the separated hot air is directly supplied to each high-temperature processing equipment and used as an efficient heat source. This design not only improves the resource utilization efficiency, but also ensures that the temperature requirements of each processing link are accurately met. The overall use effect is extremely excellent. The present invention innovatively introduces a hot air delivery component 24, which has the ability to accurately distinguish the temperature of hot air and can accurately deliver hot air to the high-temperature processing equipment with corresponding requirements according to the temperature range. Specifically, hot air in the range of 40°C to 80°C is accurately distributed to the temperature control pipe 80 and the high-temperature pipe 62, which is specially used for desulfurization and deacidification processes to ensure that these chemical reactions are carried out efficiently under suitable temperature conditions.The hot air with a temperature exceeding 80°C is transported to the natural gas drying component 200, which is specially used for the drying treatment of natural gas. Through this precise distribution of temperature, not only the utilization efficiency of hot air is improved, but also the operation effect of each high-temperature treatment equipment is significantly improved. The overall application effect is remarkable. The present invention is also innovatively equipped with a cold air insulation component 25, which can circulate and transport low-temperature cold air with a temperature of about -168°C to the metal cold box 11. Through the efficient thermal conductivity of the metal cold box 11, the rapid cooling of the inside of the cold box 10 is achieved. This design effectively replaces the refrigeration function of part of the condenser 12 and the refrigerant, which not only greatly saves energy consumption, but also significantly improves the refrigeration efficiency inside the cold box 10. Overall, this innovative design is not only energy-saving and environmentally friendly, but also significantly optimizes the use effect of the cold box 10, showing excellent performance. ,

[0025] In one embodiment of the present invention, Figure 3 As shown, the compressed air component 21 includes a frame 210, an air collecting box 211, an air compressor 212 and an air storage box 213. The frame 210 is fixedly connected to the base 100 and is located on one side of the cold box 10. The air collecting box 211, the air compressor 212 and the air storage box 213 are fixedly connected to the inner wall of the frame 210 in sequence along the vertical direction. One end of the cold air utilization component 22 and the hot air gas transmission component 24 respectively penetrate into the interior of the frame 210 and are connected to the air inlet end arranged on the surface of the air collecting box 211. The air inlet end of the air compressor 212 is connected to the interior of the air collecting box 211, and the exhaust end of the air compressor 212 is connected to the interior of the air storage box 213, wherein a valve is arranged on the exhaust end of the air compressor 212, and the air storage box 213 is connected to one end of the cold air gas transmission component 23.

[0026] It should be noted that an air supply pipe is separately provided on the surface of the air collecting box 211 , and a pressure relief valve and a pressure sensor are respectively provided on the air collecting box 211 and the air storage box 213 .

[0027] Specifically, the structure and connection relationship of the compressed air component 21 are further explained. The compressed air component 21 is not only responsible for collecting the discharged cold air that has been restored to normal temperature, but also has the ability to compress the cold air into compressed air, which provides valuable raw materials for the subsequent generation of cold air and hot air. The core components of the compressed air component 21 include an air collecting box 211, an air compressor 212 and an air storage box 213. During operation, the air collecting box 211 first collects the cold air that has been processed and restored to normal temperature. Then, the air compressor 212 automatically starts to extract the normal temperature cold air from the air collecting box 211. And through its powerful compression function, it converts the cold air into high-pressure compressed gas. After compression, the gas is transported to the air storage tank 213 for storage for subsequent use. The whole operation process is not only simple and easy, but also energy-saving and efficient. Through the automatic extraction and compression function of the air compressor 212 and the storage function of the air storage tank 213, the compressed air component 21 can stably and continuously provide compressed air, providing the necessary raw material support for subsequent process links. This design not only optimizes the utilization of cold air resources, but also improves the energy efficiency of the overall system, showing an excellent energy-saving effect.

[0028] In one embodiment of the present invention, Figure 4 As shown, the cold air utilization component 22 includes a first three-way pipe 221, a first ventilation pipe 222, a second ventilation pipe 223 and a third ventilation pipe 224. The first three-way pipe 221 is fixedly connected to the surface of the exhaust cooling pipe 13, the air inlet end of the first three-way pipe 221 is connected to the exhaust cooling pipe 13, one group of exhaust ends of the first three-way pipe 221 is connected to the air inlet end of the first cooling pipe 50 in the low-temperature separation component through the first ventilation pipe 222, and the other group of exhaust ends of the first three-way pipe 221 is connected to one end of the cold air delivery component 23, the exhaust end of the first cooling pipe 50 in the low-temperature separation component is respectively connected to the air inlet end of the second cooling pipe 60 in the deacidification component and the third cooling pipe 70 in the dehydration component through the second ventilation pipe 223, and the exhaust ends of the second cooling pipe 60 in the deacidification component and the third cooling pipe 70 in the dehydration component are respectively connected to the air inlet end on the surface of the air collecting box 211 through the third ventilation pipe 224.

[0029] Specifically, the structure and connection relationship of the cold air utilization component 22 are further explained. The design of the cold air utilization component 22 fully reflects the concept of efficient recovery and utilization of the cold air discharged from the cold box 10. This component is not only responsible for receiving the cold air discharged from the cold box 10, but also carefully plans its transportation path to ensure that the cold air resources are utilized to the greatest extent in different process links, thereby achieving the goal of efficient energy saving.

[0030] Specifically, in order to meet the low-temperature separation process's requirement for a temperature of -100°C, the cold air is first transported to the interior of the first cooling tube 50. In the first cooling tube 50, the cold air fully releases its cold energy to provide the necessary cooling effect for the low-temperature separation process. After completing the low-temperature separation, the cold air continues to flow and is transported to the interior of the second cooling tube 60 and the third cooling tube 70, respectively. These two cooling tubes respectively meet the low-temperature deacidification and low-temperature dehydration process's requirements for a temperature range of -40°C to -20°C. In the second cooling tube 60 and the third cooling tube 70, the cold air continues to play its cooling role to help the low-temperature deacidification and low-temperature dehydration process proceed smoothly. Finally, the cold air that has been used many times and whose temperature gradually increases is transported to the air collecting box 211, where the cold air is further collected and processed to provide raw materials for the subsequent compressed air component 21. Through this series of temperature sequence settings and cold air transportation processes, the cold air utilization component 22 not only ensures the full utilization of cold air resources in different process links, but also significantly improves the energy efficiency and use effect of the overall system.

[0031] In one embodiment of the present invention, Figure 4 As shown, a central connecting pipe 225 is respectively connected between the second cooling pipe 60 in the deacidification component and the second ventilation pipe 223 and the third ventilation pipe 224, and second three-way pipes 226 are respectively arranged on the surfaces of the two groups of central connecting pipes 225. The air inlet ends of the two groups of second three-way pipes 226 and one group of exhaust ends are respectively connected to the inside of the two groups of central connecting pipes 225, and the other group of exhaust ends of the two groups of second three-way pipes 226 are respectively connected to the air inlet end and the exhaust end of the low-temperature pipe 61 in the deacidification component.

[0032] Specifically, the middle connecting pipe 225 serves as a bridge for cold air delivery, connecting different parts of the cold air utilization component 22, and the second three-way pipe 226 is located on the middle connecting pipe 225, playing a key diversion role. It is responsible for accurately introducing cold air that meets the temperature conditions required by the second cooling pipe 60 (-40°C to -20°C) into the low-temperature pipe 61. Inside the low-temperature pipe 61, these cold air continue to play its efficient heat conduction role, so that the pipe wall is evenly cooled. Since the low temperature in the tower is the same as the cold air temperature of the temperature conditions required by the second cooling pipe 60, this design can ensure that the temperature in the tower is accurately controlled to the ideal deacidification range, which not only improves the deacidification efficiency, but also avoids the process instability caused by temperature fluctuations. In addition, through the mutual cooperation of the middle connecting pipe 225 and the second three-way pipe 226, the system can further increase the number of related low-temperature equipment, which means that more low-temperature equipment can share the same cold source, thereby improving the utilization rate of the cold source. This design not only reduces energy consumption, but also improves the energy efficiency and flexibility of the overall system.

[0033] In one embodiment of the present invention, Figure 4As shown, a second exhaust valve 2251 is provided on the surface of the middle connecting pipe 225 which is respectively connected to the third ventilation pipe 224 and the second cooling pipe 60 . The second exhaust valve 2251 is located between one group of exhaust ends of the third ventilation pipe 224 and the exhaust end of the second cooling pipe 60 .

[0034] Specifically, installing the second exhaust valve 2251 can effectively prevent the cold air exhausted from the low-temperature pipe 61 from flowing back into the second cooling pipe 60, ensuring that all gases smoothly enter the third ventilation pipe 224, significantly improving the operating efficiency and effect of the system.

[0035] In one embodiment of the present invention, Figure 1 , Figure 3 and Figure 5 As shown, the cold air delivery component 23 includes an exhaust pipe seat 231, a third exhaust valve 232, a vortex tube 233, a cold air pipeline 234, a fourth exhaust valve 235, a first temperature sensor 236, a cold air collecting box 237 and a fifth exhaust valve 238. The exhaust pipe seat 231 is fixedly connected to the surface of the air storage box 213 and is connected to the inside of the air storage box 213. One end of the exhaust pipe seat 231 passes through the outside of the frame 210 and is connected to the air inlet end of the vortex tube 233. The third exhaust valve 232 is arranged on the surface of one end of the exhaust pipe seat 231 passing through the outside of the frame 210. The cold air pipeline 234 is fixedly connected to the surface of the cold box 10, one end of the cold air pipe 234 is connected to the cold air end of the vortex tube 233, and the other end of the cold air pipe 234 is connected to one group of exhaust ends of the first three-way pipe 221, the fourth exhaust valve 235, the first temperature sensor 236 and the cold air collecting box 237 are arranged on the cold air pipe 234 in sequence, the fifth exhaust valve 238 is arranged on the surface of the first three-way pipe 221 and corresponds to the position of the cold air pipe 234, the hot air end of the vortex tube 233 is connected to the hot air delivery component 24, and the cold air insulation component 25 is arranged on the cold air collecting box 237.

[0036] Specifically, the structure and connection relationship of the cold air delivery component 23 are further explained. The cold air delivery component 23 is carefully designed to process compressed air and convert it into cold air and hot air of set temperature. Specifically, the component can deliver cold air with a temperature as low as about -168° by connecting to the metal cold box 11. This measure significantly reduces the internal temperature of the cold box 10, effectively shares part of the workload of the refrigerant and the condenser 12, and reduces energy consumption. In addition, the cold air delivery component 23 also accurately delivers the cold air with a temperature of -100° after consuming part of the cold energy into the first cooling pipe 50 through the connection of the first three-way pipe 221, which meets the temperature requirement of about -100° for low-temperature separation. Then, during the transportation process, after consuming part of the cold energy, the cold air with a temperature of about -40° is accurately delivered to the second cooling pipe 60 and the third cooling pipe 70, respectively, which meets the -40° cooling requirements of low-temperature deacidification and low-temperature dehydration cooling. ° to -20°, and then during the transportation process, after continuing to consume part of the cold air, the air with a temperature of about 20° is transported to the air collecting box 211 for storage. At the same time, the cold air delivery component 23 and the hot air delivery component 24 work closely together to reasonably distribute the hot air in the range of 40° to 80° generated by the vortex tube 233. The hot air is respectively guided to the temperature control pipe 80 and the high-temperature pipe 62, providing a suitable temperature environment for the desulfurization and deacidification processes, ensuring the efficient progress of the chemical reaction, and when the hot air temperature exceeds 80°, the hot air delivery component 24 delivers this part of heat energy to the natural gas drying component 200 for drying the natural gas, showing excellent use effect and flexibility. The cold air delivery component 23 not only optimizes the distribution and utilization of cold air, but also through the coordinated work with the hot air delivery component 24, realizes the precise and efficient temperature control in the natural gas processing process, and the use effect is good.

[0037] In one embodiment of the present invention, Figure 1 and Figure 5As shown, the hot air delivery component 24 includes a third three-way pipe 241, a switching valve 242, a hot air pipeline 243, a middle pipe 244, a return air pipe 245 and a second temperature sensor 246. The third three-way pipe 241 is fixedly connected to the hot air end surface of the vortex tube 233, the switching valve 242 is arranged on the surface of the third three-way pipe 241, the hot air pipeline 243 is fixedly connected to the surface of the cold box 10 and is located on one side of the bottom of the cold air pipeline 234. One end of the hot air pipeline 243 is connected to one group of exhaust ends of the third three-way pipe 241, and the other end of the hot air pipeline 243 is connected to the inlet of the temperature control pipe 80 in the desulfurization component. The middle connecting pipe 244 is fixedly connected to the surface of the cold box 10, one end of the middle connecting pipe 244 is connected to the exhaust end of the temperature control pipe 80 in the desulfurization component, and the other end of the middle connecting pipe 244 is connected to the air inlet end of the high-temperature pipe 62 in the deacidification component. The return air pipe 245 is fixedly connected to the surface of the cold box 10, one end of the return air pipe 245 is connected to the exhaust end of the high-temperature pipe 62 in the deacidification component, and the other end of the return air pipe 245 passes through the interior of the frame 210 and is connected to the air inlet end arranged on the surface of the air collecting box 211. The second temperature sensor 246 is arranged on the surface of the hot air pipe 243.

[0038] It should be noted that a heat-insulating layer is provided on the surfaces of the hot air pipe 243 , the intermediate pipe 244 and the return air pipe 245 .

[0039] Specifically, the structure and connection relationship of the hot air delivery component 24 are further explained. The hot air delivery component 24 is designed to capture the hot air between 40° and 80° generated by the vortex tube 233, and efficiently transmit it to the temperature control tube 80 of the desulfurization component, the high-temperature tube 62 of the deacidification component and the gas collecting box 211 in turn. In the temperature control tube 80, the hot air causes the tube wall to heat up synchronously through heat conduction. This mechanism is crucial in semi-dry desulfurization technology. It can ensure that the operating temperature is maintained in the ideal range of 40° to 80°, thereby maximizing the activity and reaction rate of the desulfurizer and significantly improving the desulfurization effect. The operating temperature range of traditional low-temperature distillation towers usually spans from tens of degrees Celsius to negative tens of degrees Celsius. In the high-temperature tube 62, the hot air continues to exert its heat conduction efficiency, causing the tube wall to heat up synchronously, effectively adjusting the temperature in the tower to a range suitable for deacidification. Finally, the fully utilized hot air is introduced into the gas collecting box 211 for centralized collection. The entire process shows excellent application and good use effect.

[0040] In actual application, the hot air with a temperature of 40° to 80° generated by the vortex tube 233 is first smoothly introduced into the hot air pipe 243 through the third three-way pipe 241, and then accurately sent to the interior of the temperature control pipe 80 along the hot air pipe 243. In the temperature control pipe 80, the hot air continues its process and is then guided to the interior of the high-temperature pipe 62. Finally, the hot air after a series of effective utilization is discharged to the air collecting box 211 for centralized treatment. For the hot air with a temperature exceeding 80° generated by the vortex tube 233, this part of the heat energy is directly transported to the interior of the natural gas drying component 200 for utilization. In order to ensure the accuracy of temperature control, the system is equipped with a second temperature sensor 246 for real-time monitoring. Once the air temperature is detected to exceed 80°, the air flow path can be quickly adjusted by simply operating the switching valve 242 to ensure that all hot air above 80° is guided to the natural gas drying component 200, thereby achieving efficient distribution and utilization of thermal energy.

[0041] In one embodiment of the present invention, Figure 5 As shown, another set of exhaust ends of the third three-way pipe 241 is connected to the air inlet end of the natural gas drying component 200 .

[0042] Specifically, connecting the other exhaust end of the third three-way pipe 241 to the air inlet end of the natural gas drying component 200 can make full use of the hot air above 80°. By introducing this hot air into the natural gas drying component 200, the heating efficiency can be significantly improved, and the energy consumption of the electric heating component can be effectively reduced, achieving better performance.

[0043] In one embodiment of the present invention, Figure 1 , Figure 3 and Figure 5 As shown, a metal heat sink 247 is provided on the surface of the return air pipe 245 .

[0044] It should be noted that the metal heat sink 247 described in this embodiment is used to cool the passing gas, and the material can be selected to be aluminum alloy or copper alloy.

[0045] Specifically, the metal radiator 247 can effectively cool the hot air at 40° to 80° to about 20°, ensuring that the temperature of the air entering the air collecting box 211 is consistent with the original air in the box, thereby maintaining the stability of the compressed air temperature inside the air storage box 213, avoiding temperature increase, and achieving good use effect.

[0046] In one embodiment of the present invention, Figure 5-Figure 6As shown, the cold air insulation component 25 includes a circulating air pump 251, a first delivery pipe 252 and a second delivery pipe 253. The circulating air pump 251 is fixedly connected to the top of the cold air collecting box 237. The air inlet end of the circulating air pump 251 is connected to the interior of the cold air collecting box 237. The exhaust end of the circulating air pump 251 is connected to the interior of the air inlet end of the first delivery pipe 252. The exhaust end of the first delivery pipe 252 passes through the interior of the cold box 10 and is connected to the interior of the air inlet end of the metal cold box 11. The exhaust end of the metal cold box 11 is connected to the interior of the air inlet end of the second delivery pipe 253, and the exhaust end of the second delivery pipe 253 is connected to the interior of the cold air collecting box 237.

[0047] Specifically, the cold air insulation component 25 is intended to maintain the low temperature state of the cold box 10 and the metal cold box 11 inside it by circulating cold air, thereby improving the energy efficiency and stability of the entire system. In the cold air insulation component 25, the circulating air pump 251 works to draw cold air from the cold air collecting box 237 and deliver it to the metal cold box 11 in the cold box 10 through the first delivery pipe 252. In the metal cold box 11, the cold air absorbs heat and lowers the temperature, and then is re-delivered back to the cold air collecting box 237 through the second delivery pipe 253. In this way, the cold air forms a closed-loop circulation in the system, which not only improves the utilization rate of the cold air, but also maintains the low temperature state of the cold box 10 and the metal cold box 11 inside it, effectively replacing part of the refrigeration function of the condenser 12 and the refrigerant, not only saving energy and reducing emissions, but also greatly improving the refrigeration efficiency.

[0048] In summary, the embodiment of the present invention is a high-efficiency and energy-saving natural gas processing device. The present invention has a reasonable structure, can efficiently recycle and utilize the exhausted cold air, effectively solves the problem of cold source emission, and realizes the precise separation of cold and hot air through a sophisticated secondary treatment process. In this process, the treated cold air can replace part of the refrigeration function of the condenser 12 and the refrigerant, which not only saves energy and reduces emissions, but also greatly improves the refrigeration efficiency. The treated hot air can meet the heating needs of related high-temperature equipment, realizes energy saving and efficiency improvement of heating equipment, and has excellent overall application performance.

[0049] In the description of this specification, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0050] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0051] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and deform the above embodiments within the scope of the present invention.

Claims

1. A highly efficient and energy-saving natural gas processing device, characterized in that: include: A liquid cooling assembly (101): comprising a cold box (10) arranged on a base (100), wherein a metal cold box (11) and a condenser (12) are arranged on the upper and lower inner walls of the cold box (10), a first exhaust valve (14) is arranged on the surface of a cold exhaust pipe (13) of the cold box (10), and an air intake pipe (15) of the cold box (10) is connected to the inside of a natural gas pipeline (16); A high-efficiency energy-saving component (202): comprising a compressed air component (21), a cold air utilization component (22), a cold air delivery component (23), a hot air delivery component (24) and a cold air insulation component (25), wherein the compressed air component (21) is arranged on a base (100) and is located on one side of the cold box (10), the cold air utilization component (22) is arranged on a cold exhaust pipe (13), one end of the cold air utilization component (22) is connected to the cold exhaust pipe (13), and the other end of the cold air utilization component (22) is connected to the compressed air component (21), the first cooling pipe (50) in the low-temperature separation component, the second cooling pipe (60) in the deacidification component and the third cooling pipe (70) in the dehydration component are respectively arranged on the cold air utilization component (22), and the cold air delivery component (23) is arranged on the compressed air component (21), One end of the cold air delivery component (23) is connected to the compressed air component (21), and the other end of the cold air delivery component (23) is connected to the cold air utilization component (22). The hot air delivery component (24) and the cold air insulation component (25) are respectively arranged on the cold air delivery component (23). One end of the hot air delivery component (24) is connected to the cold air delivery component (23), and the other end of the hot air delivery component (24) is connected to the compressed air component (21). The temperature control pipe (80) in the desulfurization component and the high temperature pipe (62) in the deacidification component are respectively arranged on the hot air delivery component (24). One end of the cold air insulation component (25) is connected to the cold air delivery component (23), and the other end of the cold air insulation component (25) passes through the interior of the cold box (10) and is connected to the metal cold box (11).

2. The high-efficiency and energy-saving natural gas processing device according to claim 1, characterized in that: The compressed air component (21) comprises a frame (210), an air collecting box (211), an air compressor (212) and an air storage box (213); the frame (210) is fixedly connected to a base (100) and is located on one side of the cold box (10); the air collecting box (211), the air compressor (212) and the air storage box (213) are fixedly connected to the inner wall of the frame (210) in sequence in a vertical direction; the cold air utilization component (22) and the hot air delivery component (24 ) one end of each of the air compressors (212) passes through the interior of the frame (210) and is connected to an air inlet end provided on the surface of the air collecting box (211); an air inlet end of the air compressor (212) is connected to the interior of the air collecting box (211); an exhaust end of the air compressor (212) is connected to the interior of the air storage box (213); a valve is provided on the exhaust end of the air compressor (212); and the air storage box (213) is connected to one end of the cold air delivery assembly (23).

3. The high-efficiency and energy-saving natural gas processing device according to claim 2 is characterized in that: The cold air utilization component (22) comprises a first three-way pipe (221), a first ventilation pipe (222), a second ventilation pipe (223) and a third ventilation pipe (224); the first three-way pipe (221) is fixedly connected to the surface of the cold exhaust pipe (13); an air intake end of the first three-way pipe (221) is connected to the cold exhaust pipe (13); one set of exhaust ends of the first three-way pipe (221) is connected to an air intake end of a first cooling pipe (50) in a low-temperature separation component via the first ventilation pipe (222); the first three-way pipe ( Another group of exhaust ends of the cooling tube (221) is connected to one end of the cold air delivery assembly (23); the exhaust end of the first cooling tube (50) in the low-temperature separation assembly is connected to the air inlet ends of the second cooling tube (60) in the deacidification assembly and the third cooling tube (70) in the dehydration assembly through the second ventilation tube (223); the exhaust ends of the second cooling tube (60) in the deacidification assembly and the third cooling tube (70) in the dehydration assembly are connected to the air inlet ends on the surface of the air collecting box (211) through the third ventilation tube (224).

4. The high-efficiency and energy-saving natural gas processing device according to claim 3 is characterized in that: A central connecting pipe (225) is respectively connected between the second cooling pipe (60) and the second ventilation pipe (223) and the third ventilation pipe (224) in the deacidification component; second three-way pipes (226) are respectively arranged on the surfaces of the two groups of the central connecting pipes (225); the air inlet ends and one group of the exhaust ends of the two groups of the second three-way pipes (226) are respectively connected to the inside of the two groups of the central connecting pipes (225); and the other group of the exhaust ends of the two groups of the second three-way pipes (226) are respectively connected to the air inlet end and the exhaust end of the low-temperature pipe (61) in the deacidification component.

5. The high-efficiency and energy-saving natural gas processing device according to claim 4 is characterized in that: A second exhaust valve (2251) is provided on the surface of the intermediate connecting pipe (225) respectively connected to the third ventilation pipe (224) and the second cooling pipe (60); the second exhaust valve (2251) is located between one group of exhaust ends of the third ventilation pipe (224) and the exhaust end of the second cooling pipe (60).

6. The high-efficiency and energy-saving natural gas processing device according to claim 3 is characterized in that: The cold air delivery assembly (23) comprises an exhaust pipe seat (231), a third exhaust valve (232), a vortex tube (233), a cold air pipeline (234), a fourth exhaust valve (235), a first temperature sensor (236), a cold air collecting box (237) and a fifth exhaust valve (238); the exhaust pipe seat (231) is fixedly connected to the surface of the air storage box (213) and is connected to the interior of the air storage box (213); one end of the exhaust pipe seat (231) passes through the outside of the frame (210) and is connected to the air inlet end of the vortex tube (233); the third exhaust valve (232) is arranged on the surface of one end of the exhaust pipe seat (231) passing through the outside of the frame (210); the cold air pipeline (234) is fixedly connected to the surface of the cold box (10), one end of the cold air pipe (234) is connected to the cold air end of the vortex tube (233), and the other end of the cold air pipe (234) is connected to one set of exhaust ends of the first three-way pipe (221). The fourth exhaust valve (235), the first temperature sensor (236) and the cold air collecting box (237) are arranged on the cold air pipe (234) in sequence, the fifth exhaust valve (238) is arranged on the surface of the first three-way pipe (221) and corresponds to the position of the cold air pipe (234), the hot air end of the vortex tube (233) is connected to the hot air delivery component (24), and the cold air insulation component (25) is arranged on the cold air collecting box (237).

7. The high-efficiency and energy-saving natural gas processing device according to claim 6, characterized in that: The hot air delivery assembly (24) comprises a third three-way pipe (241), a switching valve (242), a hot air pipeline (243), a middle pipe (244), a return air pipe (245) and a second temperature sensor (246); the third three-way pipe (241) is fixedly connected to the hot air end surface of the vortex tube (233); the switching valve (242) is arranged on the surface of the third three-way pipe (241); the hot air pipeline (243) is fixedly connected to the surface of the cold box (10) and is located on one side of the bottom of the cold air pipeline (234); one end of the hot air pipeline (243) is connected to one group of exhaust ends of the third three-way pipe (241); and the other end of the hot air pipeline (243) is connected to the temperature control pipe (80) in the desulfurization assembly. The middle pipe (244) is fixedly connected to the surface of the cold box (10), one end of the middle pipe (244) is connected to the exhaust end of the temperature control pipe (80) in the desulfurization component, and the other end of the middle pipe (244) is connected to the intake end of the high-temperature pipe (62) in the deacidification component. The return pipe (245) is fixedly connected to the surface of the cold box (10), one end of the return pipe (245) is connected to the exhaust end of the high-temperature pipe (62) in the deacidification component, and the other end of the return pipe (245) passes through the interior of the frame (210) and is connected to the intake end arranged on the surface of the air collecting box (211). The second temperature sensor (246) is arranged on the surface of the hot air pipe (243).

8. The high-efficiency and energy-saving natural gas processing device according to claim 7 is characterized in that: Another set of exhaust ends of the third three-way pipe (241) is connected to the air inlet end of the natural gas drying component (200).

9. The high-efficiency and energy-saving natural gas processing device according to claim 7, characterized in that: A metal heat sink (247) is provided on the surface of the air return pipe (245).

10. The high-efficiency and energy-saving natural gas processing device according to claim 1, characterized in that: The cold air insulation component (25) comprises a circulating air pump (251), a first delivery pipeline (252) and a second delivery pipeline (253); the circulating air pump (251) is fixedly connected to the top of the cold air collecting box (237); an air inlet end of the circulating air pump (251) is connected to the inside of the cold air collecting box (237); an exhaust end of the circulating air pump (251) is connected to the inside of the air inlet end of the first delivery pipeline (252); an exhaust end of the first delivery pipeline (252) passes through the inside of the cold box (10) and is connected to the inside of the air inlet end of the metal cold box (11); the exhaust end of the metal cold box (11) is connected to the inside of the air inlet end of the second delivery pipeline (253); and an exhaust end of the second delivery pipeline (253) is connected to the inside of the cold air collecting box (237).

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