Air pre-cooling device for deep cooling air separation

Abstract

The invention discloses an air pre-cooling device for deep cooling air separation, and relates to the field of gas separation. According to the invention, a complex gas guide cavity and cooling water cavity system is constructed in the pre-cooling disc and the connecting cylinder, and is matched with a spiral blade I and a spiral plate in the gas guide cavity to guide gas to flow in a spiral path, so that the contact path of the gas and cooling liquid is greatly prolonged, and the contact area and time are obviously increased; according to the air cooling tower, the air cooling tower can fully exchange heat with cooling liquid, so that the heat exchange efficiency is greatly improved, the defects of a traditional indirect contact type cooling tower are effectively overcome, a more efficient pre-cooling effect is provided for a deep cooling air separation system, and the overall performance of the system is powerfully guaranteed; and the flowing direction of the gas is opposite to that of the cooling liquid, so that the gas can fully utilize the cooling capacity of the cooling liquid, the energy utilization efficiency is greatly improved, and the energy consumption is reduced.

Description

Technical Field

[0001] The invention relates to the field of gas separation, in particular to an air precooling device for deep cold air separation. Background Art

[0002] Cryogenic air separation technology is one of the core processes in the field of gas separation. It is widely used in the large-scale production of oxygen, nitrogen and rare gases, and plays an important supporting role in the chemical, metallurgical, medical and energy industries. This technology compresses, purifies and cools the air to extremely low temperatures (usually below -150°C), and uses the differences in boiling points of various components to achieve efficient separation. With the growing demand for high-purity gases due to industrial development, improving the energy efficiency and stability of air separation systems has become a key direction of technical optimization.

[0003] In the existing cryogenic air separation system, the air precooling device is a crucial link. Traditional air precooling devices mainly use direct contact cooling towers, indirect contact cooling towers and refrigeration units. Direct contact cooling towers achieve cooling through direct contact between air and cooling water. Although the cooling effect is good, there are problems of water pollution and equipment corrosion; indirect contact cooling towers use heat exchange tubes to separate air and cooling water, which solves the corrosion problem to a certain extent, but the heat exchange efficiency needs to be improved; although the refrigeration unit precooling device can achieve precise temperature control, it has high energy consumption.

[0004] In the actual application of cryogenic air separation, indirect contact cooling towers mainly rely on heat exchange tubes to achieve heat exchange between air and cooling water. In order to ensure the strength and sealing of the equipment, the structural design of the heat exchange tubes is difficult to maximize the heat exchange area without affecting other performances, resulting in insufficient effective heat exchange area between air and cooling water and insufficient heat transfer, which will undoubtedly affect the pre-cooling effect and further affect the overall performance of the cryogenic air separation system. Summary of the invention

[0005] Based on this, the purpose of the present invention is to provide an air precooling device for cryogenic air separation to solve the technical problems mentioned in the above background technology.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solution: an air precooling device for cryogenic air separation, comprising a tower body and a precooling mechanism, wherein the precooling mechanism comprises a plurality of groups of precooling plates installed in the tower body and a liquid inlet box installed at the end of the tower body, and a connecting tube is installed in the middle of each precooling plate, each group of connecting tubes is connected to two groups of precooling plates, and an air guide cavity for guiding airflow is opened in the precooling plate and the connecting tube; The air guide cavity includes a first longitudinal air cavity, a first transverse air cavity, a second longitudinal air cavity, and a second transverse air cavity that are opened in the pre-cooling disk and communicate with each other, and a third longitudinal air cavity that is opened in the connecting cylinder and communicates with the two second transverse air cavities. Two cooling water cavities are respectively opened on both sides of the air guide cavity in the connecting cylinder and the pre-cooling disk, and the cooling water cavities in the connecting cylinder and the pre-cooling disk communicate with each other. The liquid inlet box communicates with the cooling water cavity. Two adjacent pre-cooling disks are symmetric and communicate with each other. A spiral member is arranged in the air guide cavity, and both sides of the spiral member extend to fit with the inner wall of the cooling water cavity.

[0007] By adopting the above technical solution, the gas and the coolant have their respective clear flow paths in the device, laying a foundation for realizing efficient pre-cooling, ensuring the stable operation of the device, and solving problems such as low heat exchange efficiency existing in traditional pre-cooling devices.

[0008] Furthermore, the cross-sections of the first longitudinal air cavity, the first transverse air cavity, the second longitudinal air cavity, and the second transverse air cavity opened in the pre-cooling disk and the third longitudinal air cavity opened in the connecting cylinder are all annular designs. The maximum diameter of the pre-cooling disk is smaller than the diameter of the inner wall of the tower body and does not contact the inner wall of the tower body.

[0009] By adopting the above technical solution, the annular design of each cavity in the pre-cooling disk and the connecting cylinder helps the gas to be evenly distributed in the cavity, enables the gas to fully contact the coolant, and improves the heat exchange efficiency. The size relationship between the pre-cooling disk and the tower body avoids the influence of the tower body temperature on the pre-cooling disk, ensures the stability of the pre-cooling effect, and enhances the adaptability of the device to different working environments.

[0010] Furthermore, the two adjacent pre-cooling disks are connected by a docking plate. Multiple ventilation grooves communicating with the first longitudinal air cavity are equally angled on the docking plate, and multiple liquid passing grooves communicating with the cooling water cavity are equally angled on the docking plate.

[0011] By adopting the above technical solution, the ventilation grooves and the liquid passing grooves on the docking plate respectively provide flow channels for the gas and the coolant, ensure the smooth flow of the gas between the pre-cooling disks, evenly distribute the coolant between adjacent pre-cooling disks, make the whole pre-cooling process more coherent and efficient, and contribute to improving the overall cooling performance of the device.

[0012] Furthermore, a bottom box connected to the two cooling water cavities is installed at one end of the tower body where the liquid inlet box is not installed, a drainage box connected to the bottom box is installed on the side wall of the tower body, and a drainage pipe is installed on the side wall of the drainage box.

[0013] By adopting the above technical solution, it ensures the circulating flow of the coolant in the device, enables the coolant to continuously take away heat, maintains a stable cooling effect, and at the same time facilitates the recovery and reuse of the coolant, improving the resource utilization rate.

[0014] Further, the spiral member includes a first set of spiral vanes and spiral plates installed in multiple groups in the air guide cavity. The multiple groups of first spiral vanes are respectively located in the first longitudinal air cavity, the second longitudinal air cavity, and the third longitudinal air cavity and extend into the corresponding cooling water cavities. The multiple groups of spiral plates are respectively located in the first transverse air cavity and the second transverse air cavity and extend into the corresponding cooling water cavities.

[0015] By adopting the above technical solution, the guiding gas flows in a spiral shape, extending the flow path of the gas in a limited space, increasing the contact time and area between the gas and the coolant, strengthening the heat exchange effect. The spiral member can also support the pre-cooling disc and the connecting cylinder, enhancing the structural stability of the device.

[0016] Further, a plurality of liquid pouring grooves communicating with the liquid inlet box are equiangularly opened inside the end of the tower body, and a heat insulation cavity with an annular cross-section communicating with the liquid pouring grooves and the liquid discharge pipe is opened inside the side wall of the tower body, and a second set of spiral vanes is installed in the heat insulation cavity.

[0017] By adopting the above technical solution, the liquid pouring grooves, the heat insulation cavity, and the second set of spiral vanes cooperate with each other to introduce part of the coolant into the heat insulation cavity to cool and insulate the tower body, reducing the influence of the external environment temperature on the pre-cooling mechanism inside the tower body, ensuring that the pre-cooling effect is not interfered by the outside, and improving the reliability of the device operation.

[0018] Further, an air inlet pipe and an exhaust pipe are respectively installed at the ends of a set of the pre-cooling disc and the connecting cylinder. One end of the air inlet pipe penetrates through the bottom box and communicates with the first longitudinal air cavity, and one end of the exhaust pipe penetrates through the liquid inlet box and communicates with the third longitudinal air cavity.

[0019] By adopting the above technical solution, countercurrent heat exchange between the gas and the coolant is realized, enabling the gas to fully utilize the cold quantity of the coolant during the flow process, improving the heat exchange efficiency. The exhaust pipe penetrates through the liquid inlet box, further reducing the gas outlet temperature, ensuring that the outlet gas meets the pre-cooling requirements, and providing stable pre-cooled air for the subsequent cryogenic air separation process.

[0020] Further, a support seat for supporting the pre-cooling disc is installed inside the tower body, and the cross-section of the support seat is designed in an inverted T shape. The top surface of the bottom of the support seat is in contact with the bottom surface of the pre-cooling disc, and the outer wall of the support seat is in contact with the inner wall of the connecting cylinder.

[0021] By adopting the above technical solution, the inverted T-shaped support seat provides stable support for the pre-cooling disc and the connecting cylinder, ensuring their accurate installation positions inside the tower body, so that the device will not affect the pre-cooling effect due to component displacement during operation, and improving the stability and reliability of the device.

[0022] Further, a plurality of support plates in contact with the pre-cooling disc are equidistantly installed on the outer wall of the support seat, and the support plates are only in contact with the bottom surface of the upper one of the two pre-cooling discs.

[0023] By adopting the above technical solution, the stability of the precooling disk is further enhanced, ensuring the normal circulation of gas and coolant in the device and maintaining a stable precooling effect.

[0024] Furthermore, a plurality of support rings attached to the precooling disk are equidistantly installed in the tower body, and the support rings are only attached to the bottom surface of the lower one of the two precooling disks, and a plurality of through grooves are provided on both the support rings and the support plates.

[0025] By adopting the above technical solution, all-round support is provided for the precooling disk, improving the stability of the precooling disk and the connecting cylinder. The through grooves on the support rings and the support plates reduce the weight of the support structure and save materials.

[0026] In summary, the present invention mainly has the following beneficial effects: By constructing a complex gas guiding cavity and cooling water cavity system in the precooling disk and the connecting cylinder, and cooperating with the spiral blade I and the spiral plate in the gas guiding cavity to guide the gas to flow in a spiral path, the contact path between the gas and the coolant is greatly extended, significantly increasing the contact area and time. When the gas flows through each cavity, it can fully exchange heat with the coolant, greatly improving the heat exchange efficiency, effectively making up for the deficiencies of traditional indirect contact cooling towers, providing a more efficient precooling effect for the cryogenic air separation system, strongly guaranteeing the overall performance of the system. And the present invention adopts the design of countercurrent heat exchange between the coolant and the gas, with the gas flow direction opposite to the coolant flow direction, enabling the gas to make full use of the cold quantity of the coolant, greatly improving the energy utilization efficiency and reducing the energy consumption.

[0027] Through the reasonable layout of multiple precooling disks in the tower body of the present invention, the gas is cooled in turn through multiple precooling disks, realizing deep cooling of the gas. The adjacent precooling disks are connected by docking plates and ventilation grooves to ensure smooth gas flow, making the cooling process coherent and efficient. This multi-stage cooling design further strengthens the cooling effect, providing air with a lower temperature and more stability for subsequent cryogenic air separation, helping to improve the purity and efficiency of gas separation and meeting the requirements of industrial production for high-purity gas.

[0028] The size of the precooling disk of the present invention is ingeniously designed, and its maximum diameter is smaller than the inner wall diameter of the tower body and does not contact the inner wall of the tower body, enabling multiple precooling disks to be compactly installed inside the tower body, making full use of the limited space to achieve efficient cooling. This not only meets the gas cooling requirements but also reduces the overall volume of the device. For users, the occupation of the factory building area during the installation of this precooling device is significantly reduced, effectively reducing the site cost investment, while improving the space utilization rate and enhancing the practicality and economy of the device.

[0029] The present invention makes the spiral blades and the spiral plate fit tightly with the inner wall of the cooling water chamber, which not only plays a key role in the heat exchange process, but also plays an important supporting role for the pre-cooling plate and the connecting tube, thereby enhancing the stability of the overall structure. The support seat, support plate and support ring in the tower body work together to provide stable support for the pre-cooling plate and the connecting tube. The through grooves opened on the support ring and the support plate do not affect the supporting performance while reducing the weight of the supporting structure and saving materials, thereby ensuring the stability and safety of the pre-cooling plate and the connecting tube during use, reducing the risk of equipment failure, and increasing the service life of the equipment.

[0030] The present invention introduces part of the cooling liquid in the liquid inlet box into the insulation cavity through the joint action of the pouring trough, the insulation cavity and the spiral blade at the end of the tower body. The cooling liquid flows in the insulation cavity, effectively reduces the temperature of the tower body and has a heat insulation effect, reduces the interference of the external ambient temperature on the precooling mechanism inside the tower body, and ensures the stability of the precooling effect. At the same time, the exhaust pipe runs through the liquid inlet box, so that the gas is further cooled by the low-temperature cooling liquid in the liquid inlet box when flowing out, ensuring that the temperature of the outflowing gas meets the precooling requirements, providing stable and reliable precooling air for the subsequent cryogenic air separation process, and ensuring the stable operation of the entire cryogenic air separation system. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a structural schematic diagram of the present invention; Figure 2 It is a schematic diagram of the structure of the tower body after side section of the present invention; Figure 3 It is a schematic diagram of the structure of the tower body and the pre-cooling plate after side section of the present invention; Figure 4 It is a schematic diagram of the planar structure of the present invention after overall side section; Figure 5 It is a schematic diagram of the structure of the precooling plate and the connecting tube after partial sectioning of the present invention; Figure 6 This is a schematic diagram of the structure of the present invention after the spiral member is removed; Figure 7 For the present invention Figure 6 Enlarged view of point A in the middle; Figure 8 It is a schematic diagram of the connection between multiple groups of pre-cooling plates, connecting tubes and liquid inlet boxes of the present invention; Figure 9 This is a schematic diagram of the structure of the precooling plate and the connecting cylinder of the present invention after removing the spiral component; Figure 10 It is a schematic diagram of the structure of the pre-cooling plate, the connecting tube and the bottom box after side section of the present invention; Figure 11 It is a schematic diagram of the structure of the tower body and the liquid inlet box after being cut open.

[0032] In the figure: 1. Tower body; 2. Pre-cooling tray; 20. Connecting cylinder; 3. Longitudinal air chamber I; 30. Air inlet pipe; 31. Docking plate; 32. Ventilation groove; 33. Liquid passage groove; 34. Exhaust pipe; 4. Transverse air chamber I; 5. Longitudinal air chamber II; 6. Transverse air chamber II; 7. Longitudinal air chamber III; 8. Cooling water chamber; 81. Liquid inlet box; 82. Inverted liquid groove; 83. Bottom box; 84. Liquid discharge box; 85. Liquid discharge pipe; 9. First spiral blade; 90. Heat insulation chamber; 91. Second spiral blade; 10. Spiral plate; 11. Support seat; 12. Support plate; 13. Support ring. Detailed implementation manners

[0033] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present invention and cannot be understood as a limitation to the present invention.

[0034] The embodiments of the present invention will be described below according to its overall structure.

[0035] An air pre-cooling device for cryogenic air separation, as Figure 1 - Figure 11 shown, the core of the air pre-cooling device is composed of a tower body 1 and a pre-cooling mechanism. Among them, the tower body 1 serves as the main body for carrying the entire pre-cooling mechanism, providing an installation space and a support foundation for other components; Specifically, the pre-cooling mechanism in the present invention is the key part for realizing air pre-cooling, including multiple groups of pre-cooling trays 2 installed in the tower body 1 and a liquid inlet box 81 installed at the end of the tower body 1. A connecting cylinder 20 is installed in the middle of the pre-cooling tray 2. Each group of connecting cylinders 20 connects two pre-cooling trays 2, enabling gas and coolant to flow between different pre-cooling trays 2, constructing a complete pre-cooling cycle system. At the same time, a gas guiding chamber and a cooling water chamber 8 are designed inside the pre-cooling tray 2 and the connecting cylinder 20. The gas guiding chamber is used to guide the air flow, and the cooling water chamber 8 is used to circulate the coolant. The two work together to realize air pre-cooling. Adjacent pre-cooling trays 2 are symmetric and connected to each other. The spiral member arranged in the gas guiding chamber is attached to the inner wall of the cooling water chamber 8, further strengthening the pre-cooling effect. Exemplarily, the air guiding cavity in the present invention is composed of a first longitudinal air cavity 3, a first transverse air cavity 4, a second longitudinal air cavity 5, a second transverse air cavity 6 that are interconnected within the pre-cooling disc 2, and a third longitudinal air cavity 7 within the connecting cylinder 20 that is interconnected with the two groups of second transverse air cavities 6. These cavities cooperate with each other to plan a specific flow path for the gas. The first longitudinal air cavity 3 serves as the starting cavity for the gas to enter the air guiding cavity, guiding the gas into the pre-cooling disc 2. The first transverse air cavity 4 and the second longitudinal air cavity 5 further change the gas flow direction, enabling the gas to fully flow within the pre-cooling disc 2, increasing the heat exchange opportunity with the coolant. At the same time, the second transverse air cavity 6 and the third longitudinal air cavity 7 guide the gas to the next group of pre-cooling discs 2, realizing the circulating cooling of the gas between multiple groups of pre-cooling discs 2. The cross-section of each cavity is annular. This design helps the gas to be evenly distributed within the cavity, enabling the gas to more fully exchange heat with the coolant and improving the heat exchange efficiency. The maximum diameter of the pre-cooling disc 2 is smaller than the inner wall diameter of the tower body 1 and does not contact the inner wall of the tower body 1, avoiding the interference of the temperature of the tower body 1 on the pre-cooling disc 2 and ensuring that the pre-cooling effect is not affected by external factors.

[0036] Specifically, the cooling water cavity 8 in the present invention is provided both within the connecting cylinder 20 and the pre-cooling disc 2 and is interconnected. At the same time, the liquid inlet box 81 is interconnected with the cooling water cavity 8. The function of the liquid inlet box 81 is to introduce the coolant into the entire cooling system, providing a cold source for subsequent heat exchange. The coolant flows within the cooling water cavity 8, taking away the heat transferred by the gas. The two adjacent pre-cooling discs 2 are connected through a docking plate 31. The liquid through groove 33 on the docking plate 31 is interconnected with the cooling water cavity 8, ensuring the smooth flow of the coolant between adjacent pre-cooling discs 2, enabling the coolant to be evenly distributed in each pre-cooling disc 2, and ensuring that each pre-cooling disc 2 can fully play its cooling role. A bottom box 83 is installed at one end of the tower body 1 where the liquid inlet box 81 is not installed. The bottom box 83 is connected to the two groups of cooling water cavities 8. A liquid discharge box 84 is installed on the side wall of the tower body 1 and is connected to the bottom box 83. A liquid discharge pipe 85 is installed on the side wall of the liquid discharge box 84, forming a circulating loop for the coolant. The coolant enters from the liquid inlet box 81, absorbs heat within the cooling water cavity 8, passes through the bottom box 83, and finally is discharged through the liquid discharge box 84 to achieve circulating cooling.

[0037] In some examples, the spiral member is composed of multiple sets of first spiral vanes 9 and multiple sets of spiral plates 10. The multiple sets of first spiral vanes 9 are respectively located in the first longitudinal air chamber 3, the second longitudinal air chamber 5, and the third longitudinal air chamber 7, and extend into the corresponding cooling water chambers 8 and fit with the inner walls of the cooling water chambers 8; the multiple sets of spiral plates 10 are respectively located in the first transverse air chamber 4 and the second transverse air chamber 6, also extend into the corresponding cooling water chambers 8 and fit with the inner walls of the cooling water chambers 8. When in use, the first spiral vanes 9 and the spiral plates 10 guide the gas flow in the air guiding chamber, making the gas flow path spiral, greatly extending the gas flow distance in the limited space. This not only increases the heat exchange time between the gas and the coolant, strengthens the heat exchange effect, but also enables the gas to exchange heat with the coolant more evenly. The spiral member fits with the inner wall of the cooling water chamber 8, which can more effectively transfer the cold of the coolant to the gas, further improving the cooling efficiency. The spiral member also plays a supporting role for the pre-cooling plate 2 and the connecting cylinder 20, enhancing their structural stability and reducing the impact of opening the air guiding chamber and the cooling water chamber 8 on the rigidity of the pre-cooling plate 2 and the connecting cylinder 20.

[0038] Exemplarily, a plurality of liquid pouring grooves 82 communicating with the liquid inlet box 81 are equiangularly formed at the end part inside the tower body 1 of the present invention. Meanwhile, an insulating chamber 90 with an annular cross-section is also formed in the side wall of the tower body 1. The insulating chamber 90 communicates with the liquid pouring grooves 82 and the liquid discharge pipe 85, and a second spiral vane 91 is installed inside. The liquid pouring grooves 82 introduce a part of the coolant in the liquid inlet box 81 into the insulating chamber 90. The second spiral vane 91 guides the coolant to flow in the insulating chamber 90. The flow of the coolant in the insulating chamber 90 can not only reduce the temperature of the tower body 1, but also play an insulating role, reducing the influence of the external environmental temperature on the pre-cooling mechanism inside the tower body 1 and ensuring the stability of the pre-cooling effect. An air inlet pipe 30 and an exhaust pipe 34 are respectively installed at the end parts of the set of pre-cooling plates 2 closest to the installation bottom box 83 of the tower body 1 and the set of connecting cylinders 20 closest to the installation liquid inlet box 81 of the tower body 1. Among them, one end of the air inlet pipe 30 penetrates through the bottom box 83 and communicates with the first longitudinal air chamber 3, while one end of the exhaust pipe 34 penetrates through the liquid inlet box 81 and communicates with the third longitudinal air chamber 7, and the air inlet pipe 30 corresponds to the position of the bottom box 83, and the exhaust pipe 34 corresponds to the position of the liquid inlet box 81. This design realizes the countercurrent heat exchange between the gas and the coolant. During the gas flow, the gas will first exchange heat with the coolant with the highest temperature. As the gas gets closer to the exhaust pipe 34, the temperature of the coolant exchanging heat with it will become lower and lower, which can make more full use of the cold of the coolant and improve the heat exchange efficiency. At the same time, the exhaust pipe 34 penetrates through the liquid inlet box 81, enabling the gas to be further affected by the low-temperature coolant in the liquid inlet box 81 when flowing out, ensuring that the temperature of the flowing-out gas meets the pre-cooling requirements.

[0039] In the tower body 1 of the present invention, a support seat 11 for supporting the precooling tray 2 is installed. The cross-section of the support seat 11 is an inverted T shape. The bottom top surface is in contact with the bottom surface of the precooling tray 2, and the outer wall is in contact with the inner wall of the connecting cylinder 20. The support seat 11 provides the main supporting force for the precooling tray 2 and the connecting cylinder 20, ensuring their stable installation in the tower body 1; At the same time, a plurality of groups of support plates 12 are installed at equal intervals on the outer wall of the support seat 11. The support plates 12 are only in contact with the bottom surface of the upper one of the two groups of precooling trays 2; a plurality of groups of support rings 13 are installed at equal intervals in the tower body 1. The support rings 13 are only in contact with the bottom surface of the lower one of the two groups of precooling trays 2. The support rings 13 and the support plates 12 work together to further enhance the stability of the precooling tray 2 and the connecting cylinder 20. A plurality of groups of through grooves are opened on both the support rings 13 and the support plates 12. The design of the through grooves reduces the weight of the support structure and saves materials.

[0040] The working principle of the present invention is as follows: Before processing the gas, preparatory work is carried out first. The user first transports the cooling water to the liquid pouring tank 82 and the cooling water cavity 8 through the liquid inlet box 81. The cooling liquid entering the cooling water cavity 8 will start to flow under the guidance of the spiral plate 10 and the first spiral blade 9, and then enter the bottom box 83 through the cooling water cavity 8, and finally be discharged through the liquid discharge box 84 for re-circulation cooling. The cooling liquid in the liquid pouring tank 82 will flow into the heat insulation cavity 90. At this time, the cooling liquid in the heat insulation cavity 90 will start to flow under the guidance of the second spiral blade 91. The cooling liquid in the heat insulation cavity 90 cools the tower body 1 to reduce the temperature of the tower body 1, and at the same time plays a heat insulation effect. Because the cooling liquid in the heat insulation cavity 90 is guided by the second spiral blade 91, the cooling liquid will flow along the second spiral blade 91, avoiding the continuous flow of the cooling liquid in the outer wall of the tower body 1 facing the sun, and further reducing the influence of the external temperature on the precooling effect of the gas by the precooling mechanism inside the tower body 1. Finally, the cooling liquid will flow into the liquid discharge box 84 through the liquid discharge pipe 85; Subsequently, the gas can be transmitted into the air guide cavity through the air inlet pipe 30. The gas will first enter the first longitudinal air cavity 3 in the precooling tray 2. At this time, the gas will be guided by the first spiral blade 9 in the first longitudinal air cavity 3 to increase the flow path of the gas in the first longitudinal air cavity 3. Since cooling water cavities 8 are arranged on both sides of the first longitudinal air cavity 3, the temperature of the gas is reduced. As the gas flows, it will enter the first transverse air cavity 4. At this time, the spiral plate 10 in the first transverse air cavity 4 will guide the gas to increase the flow path of the gas in the first transverse air cavity 4, effectively ensuring the cooling effect on the gas. As the gas flows out of the first transverse air cavity 4, it will enter the second longitudinal air cavity 5 and then enter the second transverse air cavity 6 through the second longitudinal air cavity 5. Since the second transverse air cavity 6 is connected to the third longitudinal air cavity 7, the gas enters the third longitudinal air cavity 7; Moreover, since spiral members are provided in the longitudinal air chamber II 5, the transverse air chamber II 6, and the longitudinal air chamber III 7, the gas will be guided by the corresponding spiral blades I 9 and the spiral plates 10 during the flow process, effectively extending the flow path of the gas in the limited space, thereby increasing the cooling effect on the gas. Also, since the other end of the connecting cylinder 20 is also connected to a set of pre-cooling plates 2, the gas will re-enter the transverse air chamber II 6 of the next set of pre-cooling plates 2 through the longitudinal air chamber III 7, and start the next cooling process. At the same time, multiple sets of pre-cooling plates 2 are provided in the tower body 1, so that the gas can be fully cooled. This design makes full use of the limited space inside the tower body 1, greatly improving the space utilization rate. Through an efficient cooling method, while meeting the gas cooling requirements, it can reduce the overall volume of the device to a certain extent. In this way, when the user installs this pre-cooling device, the occupied area of the factory building is correspondingly reduced, effectively reducing the user's cost investment and space burden in terms of site; During the process of the gas entering the second set of pre-cooling plates 2 for cooling, the gas will successively pass through the transverse air chamber II 6, the longitudinal air chamber II 5, and the transverse air chamber I 4 and flow to the position of the docking plate 31. Since multiple ventilation grooves 32 are provided on the docking plate 31, the gas can smoothly pass through the docking plate 31 and enter the transverse air chamber I 4 inside the next set of pre-cooling plates 2, and then the gas will continue to be cooled as described above; During the gas flow process, since it will adhere to the inner wall of the air guide chamber and the inner wall of the spiral member, and the outer wall of the air guide chamber and the spiral member will be in contact with the coolant, the temperature in the air guide chamber will start to drop under the action of the coolant to reduce the temperature of the gas. At the same time, since the spiral member is also in contact with the coolant, it will also cool the gas, resulting in the gas being cooled on all sides during the flow process, thereby improving the pre-cooling effect on the gas; Since the intake pipe 30 and the exhaust pipe 34 are respectively located at both ends of the tower body 1, and at the same time the intake pipe 30 corresponds to the position of the bottom box 83, and the exhaust pipe 34 corresponds to the position of the liquid inlet box 81, and the coolant enters from the position of the liquid inlet box 81, the position where the exhaust pipe 34 is located is the area where the coolant temperature is the lowest, and the position where the intake pipe 30 is located is the position where the coolant that has circulated one circle passes through, so that the coolant temperature at its position is relatively higher. The flow trajectory of the coolant is opposite to the flow trajectory of the gas, so that the gas will gradually start to cool down during the flow process, and the coolant will gradually heat up during the flow process. Also, since both the coolant and the gas are restricted by the spiral member during the flow process, it further ensures that the gas flowing towards the exhaust pipe 34 will gradually cool down. When the gas starts to flow to the next process through the exhaust pipe 34, since the exhaust pipe 34 penetrates the liquid inlet box 81, the gas will also be affected by the coolant in the liquid inlet box 81 when flowing out of the exhaust pipe 34, further ensuring that the temperature of the gas when flowing out meets the pre-cooling requirements; It should be noted that during the precooling process, since the outer wall of the precooling disk 2 does not directly contact the outer wall of the tower body 1, the influence of the temperature of the tower body 1 on the temperature of the precooling disk 2 can be further reduced; During actual use, since the outer walls on both sides of the first spiral blade 9 and the spiral plate 10 are in contact with the inner wall of the cooling water chamber 8, the entire precooling disk 2 and the connecting cylinder 20 will be supported by the first spiral blade 9 and the spiral plate 10, ensuring the shape stability of the precooling disk 2 and the connecting cylinder 20 during use, reducing the influence of opening the air guiding chamber and the cooling water chamber 8 on the rigidity of the precooling disk 2 and the connecting cylinder 20. At the same time, the support seat 11, the support plate 12 and the support ring 13 will also support the precooling disk 2 and the connecting cylinder 20, which can further improve the stability of the precooling disk 2 and the connecting cylinder 20 during use. At the same time, since both the support plate 12 and the support ring 13 are only in contact with the bottom surface of a group of precooling disks 2, the weight of the precooling disk 2 is borne by the support plate 12 and the support ring 13, further ensuring the stability and safety of the precooling disk 2 during use.

[0041] Although the embodiments of the present invention have been shown and described, the specific embodiments are only interpretations of the present invention and are not limitations of the invention. The specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. After reading this specification, those skilled in the art can, without departing from the principles and purposes of the present invention, make modifications, substitutions and variations that do not contribute creatively to the embodiments as needed, but as long as they are within the scope of the claims of the present invention, they are protected by the patent law.

Claims

1. An air precooling device for cryogenic air separation, comprising a tower body (1) and a precooling mechanism, characterized in that: The pre-cooling mechanism includes multiple groups of pre-cooling trays (2) installed in the tower body (1) and a liquid inlet box (81) installed at the end of the tower body (1). A connecting cylinder (20) is installed in the middle of each pre-cooling tray (2). Each group of connecting cylinders (20) is connected to two pre-cooling trays (2), and air guiding cavities for guiding air flow are formed in the pre-cooling trays (2) and the connecting cylinders (20). The air guiding cavity includes a first longitudinal air cavity (3), a first transverse air cavity (4), a second longitudinal air cavity (5), a second transverse air cavity (6) that are formed in the pre-cooling tray (2) and communicate with each other, and a third longitudinal air cavity (7) that is formed in the connecting cylinder (20) and communicates with the two second transverse air cavities (6). Two cooling water cavities (8) are respectively formed on both sides of the air guiding cavity in the connecting cylinder (20) and the pre-cooling tray (2), and the cooling water cavities (8) in the connecting cylinder (20) and the pre-cooling tray (2) communicate with each other. The liquid inlet box (81) communicates with the cooling water cavity (8). Two adjacent pre-cooling trays (2) are symmetrical to each other and communicate with each other. A spiral member is arranged in the air guiding cavity, and both sides of the spiral member extend to fit against the inner wall of the cooling water cavity (8).

2. The air precooling device for cryogenic air separation according to claim 1, wherein: The cross-sections of the first longitudinal air cavity (3), the first transverse air cavity (4), the second longitudinal air cavity (5), the second transverse air cavity (6) formed in the pre-cooling tray (2) and the third longitudinal air cavity (7) formed in the connecting cylinder (20) are all designed in a ring shape. The maximum diameter of the pre-cooling tray (2) is smaller than the diameter of the inner wall of the tower body (1) and does not contact the inner wall of the tower body (1).

3. An air precooling device for cryogenic air separation according to claim 1, characterized in that: Two adjacent and attached pre-cooling trays (2) are connected by a docking plate (31). Multiple ventilation slots (32) that communicate with the first longitudinal air cavity (3) are equally angularly formed on the docking plate (31), and multiple liquid passing slots (33) that communicate with the cooling water cavity (8) are equally angularly formed on the docking plate (31).

4. An air precooling device for cryogenic air separation according to claim 1, characterized in that: A bottom box (83) connected to the two cooling water cavities (8) is installed at one end of the tower body (1) where the liquid inlet box (81) is not installed. A drain box (84) connected to the bottom box (83) is installed on the side wall of the tower body (1), and a drain pipe (85) is installed on the side wall of the drain box (84).

5. The air precooling device for cryogenic air separation according to claim 1, characterized in that: The spiral member includes multiple spiral vanes one (9) and spiral plates (10) installed in the air guiding cavity. Multiple spiral vanes one (9) are respectively located in the first longitudinal air cavity (3), the second longitudinal air cavity (5) and the third longitudinal air cavity (7) and extend into the corresponding cooling water cavities (8). Multiple spiral plates (10) are respectively located in the first transverse air cavity (4) and the second transverse air cavity (6) and extend into the corresponding cooling water cavities (8).

6. The air precooling device for cryogenic air separation according to claim 4, wherein: Multiple liquid pouring slots (82) that communicate with the liquid inlet box (81) are equally angularly formed inside the end of the tower body (1). A heat insulation cavity (90) with a ring-shaped cross-section that communicates with the liquid pouring slots (82) and the drain pipe (85) is formed inside the side wall of the tower body (1), and a spiral vane two (91) is installed in the heat insulation cavity (90).

7. An air precooling device for cryogenic air separation according to claim 4, characterized in that: An intake pipe (30) and an exhaust pipe (34) are respectively installed at one end of a set of the precooling trays (2) and the connecting cylinder (20). One end of the intake pipe (30) penetrates through the bottom box (83) and is communicated with the first longitudinal air chamber (3), and one end of the exhaust pipe (34) penetrates through the liquid inlet box (81) and is communicated with the third longitudinal air chamber (7).

8. The air pre-cooling device for cryogenic air separation according to claim 1, characterized in that: A support seat (11) for supporting the precooling trays (2) is installed in the tower body (1). The cross-section of the support seat (11) is designed in an inverted T shape. The bottom top surface of the support seat (11) is in contact with the bottom surface of the precooling tray (2), and the outer wall of the support seat (11) is in contact with the inner wall of the connecting cylinder (20).

9. The air precooling device for cryogenic air separation according to claim 8, characterized in that: A plurality of groups of support plates (12) in contact with the precooling trays (2) are equidistantly installed on the outer wall of the support seat (11), and the support plates (12) are only in contact with the bottom surface of the upper one of the two groups of precooling trays (2).

10. The air precooling device for cryogenic air separation according to claim 9, wherein: A plurality of groups of support rings (13) in contact with the precooling trays (2) are equidistantly installed in the tower body (1), and the support rings (13) are only in contact with the bottom surface of the lower one of the two groups of precooling trays (2). A plurality of groups of through grooves are formed in both the support rings (13) and the support plates (12).

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