Oxygen-enriched air progressive pre-cooling device for preventing low-temperature equipment thermal stress damage

Abstract

The utility model relates to air separation technical field, concretely to prevent the oxygen -enriched air gradual precooling device of low temperature equipment thermal stress damage, including air compressor, refrigeration spare, precooling box, inner tube, partition piece and spiral pipe. The utility model discloses a prevent the oxygen -enriched air gradual precooling device of low temperature equipment thermal stress damage, and the both ends of spiral pipe are through the partition piece, and connect air -in section and exhaust section respectively, and its spiral section is located in the gas precooling section, has increased the flow path length of gas in the precooling process, makes gas and the water source in precooling section can be more fully contacted to greatly increase the heat exchange area and heat exchange time, has improved the precooling effect, makes gas before entering refrigeration spare can reach lower temperature.

Description

Technical Field

[0001] This utility model relates to the field of air separation technology, specifically to an oxygen-enriched progressive precooling device for preventing thermal stress damage to low-temperature equipment. Background Technology

[0002] An air separation unit is an industrial equipment used to separate various gases in the air and produce separate gases such as oxygen, nitrogen, and argon.

[0003] In industrial production processes, the air compressor compresses air through mechanical work, which is essentially a conversion of mechanical energy into heat energy. According to thermodynamic principles, during this adiabatic compression stage, the internal energy of the gas increases significantly, directly manifested as a sharp rise in temperature. When these high-temperature gases carrying a large amount of heat energy enter the air-cooled tower, they form a strong temperature gradient with the low-temperature equipment used to cool the gas inside the tower, such as stainless steel heat exchange tube bundles and low-temperature pipes. According to the theory of materials mechanics, this temperature difference will generate uneven thermal expansion inside the equipment materials, thereby triggering thermal stress. When the thermal stress exceeds the allowable stress of the equipment materials, it will not only accelerate the fatigue failure of the equipment materials, but may also lead to problems such as cracks in welded parts and deformation of flange sealing surfaces, seriously threatening the safe and stable operation and service life of the air-cooled tower. However, existing air separation equipment does not have the capability to pre-cool the high-temperature gas after compression.

[0004] Therefore, this utility model provides an oxygen-enriched air progressive precooling device to prevent thermal stress damage to low-temperature equipment, thereby solving the above-mentioned problems. Utility Model Content

[0005] In view of the above situation and to overcome the defects of the prior art, this utility model provides an oxygen-enriched air progressive precooling device to prevent thermal stress damage to low-temperature equipment. This solves the problem that when high-temperature gas enters the air-cooling tower, a temperature difference is formed between the gas and the low-temperature equipment, causing thermal stress in the equipment. If this stress exceeds the material's tolerance limit, it will accelerate equipment fatigue and cause cracks.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] An oxygen-enriched progressive precooling device for preventing thermal stress damage to cryogenic equipment includes an air separation unit. The air separation unit includes an air compressor and a refrigeration component. A precooling box is installed between the air compressor and the refrigeration component. An inner cylinder is installed inside the precooling box. The two ends of the inner cylinder are an inlet end and an outlet end, respectively. Gas from the air compressor can enter the inlet end of the inner cylinder. Two partitions are installed inside the inner cylinder. Gas in the inlet end of the inner cylinder can flow through the area between the two partitions to the outlet end. A spiral tube is installed between the two partitions. One end of the spiral tube is connected to the inlet end of the precooling box, and the other end of the spiral tube is connected to the outlet end of the inner cylinder. Gas in the inlet end enters the spiral tube, passes through the area between the two partitions for cooling, and then flows to the outlet end for discharge.

[0008] The delay component, located inside the inner cylinder, reduces the gas flow rate within the spiral tube.

[0009] Preferably, the inner cylinder has an air inlet section, a gas precooling section, and an exhaust section. The gas precooling section is located between the air inlet section and the exhaust section, and the air inlet section and the exhaust section are connected, while the gas precooling section is not connected to the air inlet section and the exhaust section.

[0010] Preferably, both ends of the spiral tube are fixed with collars, the separator has a circular hole adapted to the collar, the outer wall of the collar is rotatably connected to the inner wall of the circular hole, and the spiral tube, collar and circular hole are all coaxially arranged.

[0011] Preferably, the delay component includes an inner transmission component, an outer transmission component, and a driving component. The inner transmission component includes a toothed ring fixed on a collar, an annular plate fixed between two connecting plates, an inner toothed ring fixed on the inner wall of the annular plate, and the inner toothed ring meshes with the toothed ring. When the annular plate rotates, the inner toothed ring, in conjunction with the toothed ring, can drive the spiral tube to rotate.

[0012] Preferably, the inner wall of the inner cylinder is provided with an annular groove that is adapted to the annular plate, and the outer wall of the annular plate is slidably connected to the inner wall of the annular groove. The annular groove is used to limit the position of the annular plate.

[0013] Preferably, the external transmission component includes an external gear ring fixed to the outer wall of the annular plate, and the external gear ring is located inside the annular groove. A linkage gear is installed on the outside of the precooling box, and the linkage gear meshes with the external gear ring. When the linkage gear rotates axially, it can drive the annular plate to slide inside the annular groove.

[0014] Preferably, the inner cylinder has a first receiving port, the precooling box has a second receiving port, and the linkage gear is located inside the first receiving port and the second receiving port.

[0015] Preferably, the driving component includes a rotating shaft mounted on the linkage gear, the rotating shaft supporting the linkage gear, a support plate fixed to the outer wall of the precooling box, one end of the rotating shaft being rotatably connected to the inner wall of the support plate, a driving source being installed on the top of the precooling box, and the output end of the driving source being fixed to the other end of the rotating shaft.

[0016] Preferably, the top and bottom of the precooling box are respectively equipped with a water injection pipe and a drain pipe. Water can be injected into the gas precooling section through the water injection pipe, and the water inside the gas precooling section can be discharged through the drain pipe.

[0017] Preferably, the air inlet of the precooling box is connected to the air outlet of the air compressor through a first air pipe. The gas after the air compressor is working can enter the interior of the precooling box through the first air pipe. The air outlet of the precooling box is connected to the air inlet of the refrigeration component through a second air pipe. The gas cooled by the precooling box flows into the interior of the refrigeration component through the second air pipe.

[0018] The beneficial effects of this utility model are as follows:

[0019] 1. The spiral tube is connected to the inlet section and the exhaust section by partitions at both ends. The spiral section is located in the gas precooling section, which increases the flow path length of the gas during the precooling process. This allows the gas to come into more full contact with the water source in the precooling section, thereby greatly increasing the heat exchange area and heat exchange time, improving the precooling effect, and enabling the gas to reach a lower temperature before entering the refrigeration unit.

[0020] 2. The water injection and drainage pipes installed at the top and bottom of the precooling box provide great convenience for water injection and drainage. During equipment operation, staff can easily inject new cooling water as needed to ensure the stability of the precooling effect.

[0021] 3. By delaying the rotation of the spiral tube driven by the component, the flow state of the gas in the spiral tube is changed, and the flow rate of the gas to the exhaust section is reduced. Since the winding direction of the spiral tube is opposite to its rotation direction, this reverse rotation method further prolongs the residence time of the gas in the spiral tube, so that the gas can more fully exchange heat with the water source in the precooling section, thereby further improving the precooling effect and ensuring that the gas reaches a more ideal temperature condition before entering the refrigeration component. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the structure of this utility model;

[0023] Figure 2 This is a schematic diagram of the precooling box of this utility model;

[0024] Figure 3This is a schematic diagram of the inner cylinder structure of this utility model;

[0025] Figure 4 This is a structural schematic diagram of the first three-dimensional cross-section of the inner cylinder of this utility model;

[0026] Figure 5 This is a schematic diagram of the delay component of this utility model.

[0027] In the picture:

[0028] 10. Air separation equipment; 101. Air compressor; 1010. Air inlet duct; 102. Refrigeration components; 103. Distillation column;

[0029] 20. Precooling assembly; 21. Precooling chamber; 22. Inner cylinder; 220. Inlet section; 221. Gas precooling section; 222. Exhaust section; 23. Separator; 24. Spiral tube; 25. Collar; 26. Circular hole; 27. Water injection pipe; 28. Drain pipe;

[0030] 30. Delay component; 31. Internal transmission component; 310. Gear ring; 311. Annular plate; 312. Internal gear ring; 313. Annular groove; 32. External transmission component; 320. External gear ring; 321. Linkage gear; 322. First receiving port; 323. Second receiving port; 33. Drive component; 330. Rotating shaft; 331. Support plate; 332. Drive source. Detailed Implementation

[0031] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Those skilled in the art should understand that these embodiments are merely illustrative of the technical principles of the present invention and are not intended to limit the scope of protection of the present invention.

[0032] Example 1

[0033] As attached Figures 1-5 As shown, an oxygen-enriched progressive precooling device for preventing thermal stress damage to cryogenic equipment includes an air separation unit 10. The air separation unit 10 is used to perform air separation. The air separation unit 10 includes an air compressor 101, a refrigeration unit 102, and a distillation column 103. An air inlet pipe 1010 is fixedly connected to one side of the air compressor 101. A first gas pipe is installed between the air compressor 101 and the refrigeration unit 102, and a second gas pipe is installed between the refrigeration unit 102 and the distillation column 103.

[0034] Since the air compressor 101, the refrigeration unit 102, and the distillation column 103 are all existing technologies, they will not be described in detail hereafter. When the air compressor 101 is working, it can draw in the outside gas through the air inlet pipe 1010. When the outside gas enters the interior of the air compressor 101, the air compressor 101 will work to process the air. The gas processed by the air compressor 101 can flow into the interior of the refrigeration unit 102 through the first gas pipe. The refrigeration unit 102 can cool the gas entering its interior. The cooled gas then enters the distillation column 103 through the second gas pipe. The gas is separated inside the distillation column 103, thereby completing the air separation process.

[0035] Example 2

[0036] The air compressor 101 is equipped with a pre-cooling component 20, which is used to cool the gas after the air compressor 101 is working, thereby achieving the effect of pre-cooling. This can reduce the damage to the internal parts caused by high-temperature gas directly entering the refrigeration component 102.

[0037] The precooling assembly 20 includes a precooling box 21 installed between the air compressor 101 and the refrigeration component 102. The air inlet of the precooling box 21 is connected to the exhaust of the air compressor 101 through a first air pipe, and the exhaust of the precooling box 21 is connected to the air inlet of the refrigeration component 102 through a second air pipe. The gas after the air compressor 101 is working can enter the interior of the precooling box 21 through the first air pipe and then be precooled by the precooling box 21. The gas cooled by the precooling box 21 flows into the interior of the refrigeration component 102 through the second air pipe.

[0038] The precooling box 21 is equipped with an inner cylinder 22 with an inner cavity. The inner cylinder 22 can contain the gas processed by the air compressor 101. The end of the inner cylinder 22 closer to the air compressor 101 is the air inlet end, and the end of the inner cylinder 22 away from the air compressor 101 is the exhaust end.

[0039] The inner cylinder 22 has an air inlet section 220, a gas pre-cooling section 221, and an exhaust section 222. The gas pre-cooling section 221 is located between the air inlet section 220 and the exhaust section 222, and the air inlet section 220 is connected to the exhaust section 222. However, the gas pre-cooling section 221 is not connected to the air inlet section 220 and the exhaust section 222. The gas processed by the air compressor 101 can enter the interior of the air inlet section 220 through the first air pipe. Then, the gas pre-cooling section 221 cools the gas. The cooled gas flows into the exhaust section 222 and then into the interior of the refrigeration unit 102 through the second air pipe.

[0040] The inner cylinder 22 has two partitions 23 inside. The partitions 23 are annular and fit against the inner wall of the inner cylinder 22. The two partitions 23 correspond to the air inlet and exhaust ends of the inner cylinder 22, respectively. The area between the partition 23 at the air inlet end of the inner cylinder 22 and the air inlet of the inner cylinder 22 is the air inlet section 220. The area between the partition 23 at the exhaust end of the inner cylinder 22 and the exhaust port of the inner cylinder 22 is the exhaust section 222. The area between the two partitions 23 is the gas precooling section 221.

[0041] The separator 23 consists of two connecting plates, the outer wall of which is fixed to the inner wall of the inner cylinder 22, and there is a gap between the two connecting plates. A spiral tube 24 is installed between the two separators 23. One end of the spiral tube 24 passes through the separator 23 at the air inlet end of the inner cylinder 22 and extends into the air inlet section 220. The other end of the spiral tube 24 passes through the separator 23 at the air outlet end of the inner cylinder 22 and extends into the air outlet section 222. The two ends of the spiral tube 24 are coaxially arranged. The air inlet section 220 is connected to the air outlet section 222 through the spiral tube 24. A collar 25 is fixed to the outer wall of both ends of the spiral tube 24. A circular hole 26 is opened on the separator 23 to match the collar 25. The outer wall of the collar 25 is rotatably connected to the inner wall of the circular hole 26. The spiral tube 24, the collar 25, and the circular hole 26 are all coaxially arranged.

[0042] The top and bottom of the precooling box 21 are respectively equipped with a water injection pipe 27 and a drain pipe 28. Water can be injected into the gas precooling section 221 through the water injection pipe 27, and the water inside the gas precooling section 221 can be discharged through the drain pipe 28.

[0043] First, water for cooling the gas is injected into the gas precooling section 221 through water injection pipe 27. When the gas processed by air compressor 101 enters the inner cylinder 22 through the first gas pipe, it first enters the air intake section 220. The gas in the air intake section 220 enters the spiral tube 24 through the port located in the air intake section 220. Since the spiral section of the spiral tube 24 is located inside the gas precooling section 221, when the gas enters the gas precooling section 221, the water inside the gas precooling section 221 will cool the gas in the spiral tube 24. The gas in the spiral tube 24 will flow to the exhaust section 222 along its extension path. The gas in the exhaust section 222 will then flow to the refrigeration unit 102 through the second gas pipe.

[0044] The inner cylinder 22 is equipped with a delay component 30, which can reduce the flow rate of gas in the spiral tube 24 when it flows to the exhaust section 222, so that the gas can contact the water source inside the gas precooling section 221 for a long time to cool down.

[0045] The delay component 30 includes an inner transmission component 31, an outer transmission component 32, and a drive component 33. The drive component 33, in conjunction with the outer transmission component 32, drives the inner transmission component 31 to rotate the spiral tube 24, thereby reducing the flow rate of gas in the spiral tube 24 towards the exhaust section 222.

[0046] The inner transmission component 31 includes a toothed ring 310 fixed on the collar 25, an annular plate 311 fixed between the two connecting plates, an inner toothed ring 312 fixed on the inner wall of the annular plate 311, and the inner toothed ring 312 meshes with the toothed ring 310. When the annular plate 311 rotates, the inner toothed ring 312, in conjunction with the toothed ring 310, can drive the spiral tube 24 to rotate.

[0047] The inner wall of the inner cylinder 22 is provided with an annular groove 313 that is adapted to the annular plate 311, and the outer wall of the annular plate 311 is slidably connected to the inner wall of the annular groove 313. The annular groove 313 is used to limit the annular plate 311, thereby maintaining the stability of the annular plate 311 when it rotates axially.

[0048] The external transmission component 32 includes an external gear ring 320 fixed to the outer wall of the annular plate 311, and the external gear ring 320 is located inside the annular groove 313. A linkage gear 321 is installed on the outside of the precooling box 21, and the linkage gear 321 is meshed with the external gear ring 320. When the linkage gear 321 rotates axially, it can drive the annular plate 311 to slide inside the annular groove 313.

[0049] The inner cylinder 22 has a first receiving port 322, the precooling box 21 has a second receiving port 323, and the linkage gear 321 is located inside the first receiving port 322 and the second receiving port 323.

[0050] The drive unit 33 includes a rotating shaft 330 mounted on the linkage gear 321, which supports the linkage gear 321. A support plate 331 is fixed to the outer wall of the precooling box 21. One end of the rotating shaft 330 is rotatably connected to the inner wall of the support plate 331. A drive source 332 is mounted on the top of the precooling box 21, and the output end of the drive source 332 is fixed to the other end of the rotating shaft 330.

[0051] The operator turns on the drive source 332 via the control panel installed on the top of the precooling box 21, putting the drive source 332 into operation. The output of the drive source 332 drives the rotating shaft 330 to rotate. The rotating shaft 330 drives the annular plate 311 to rotate via the linkage gear 321. The annular plate 311 drives the collar 25 to rotate axially via the internal gear ring 312 and the gear ring 310. The collar 25 drives the spiral tube 24 to rotate. Since the spiral tube 24 is wound in the opposite direction to its rotation, the reverse rotation prolongs the residence time of the gas in the spiral tube 24, thereby prolonging the contact time between the gas and the water inside the spiral tube 24.

[0052] The technical solution of this utility model has been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is obviously not limited to these specific embodiments. Without departing from the principle of this utility model, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will all fall within the protection scope of this utility model.

Claims

1. An oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment, comprising an air separation device (10), the air separation device (10) comprising an air compressor (101) and a refrigeration unit (102), characterized in that: A precooling box (21) is installed between the air compressor (101) and the refrigeration component (102). An inner cylinder (22) is installed inside the precooling box (21). The two ends of the inner cylinder (22) are the air inlet and the air outlet, respectively. The gas after the air compressor (101) is working can enter the air inlet of the inner cylinder (22). Two partitions (23) are installed inside the inner cylinder (22). The gas in the air inlet of the inner cylinder (22) can flow to the air outlet through the area between the two partitions (23) and be discharged. A spiral tube (24) is installed between the two partitions (23). One end of the spiral tube (24) is connected to the air inlet of the precooling box (21), and the other end of the spiral tube (24) is connected to the air outlet of the inner cylinder (22). After the gas in the air inlet enters the spiral tube (24), it is cooled through the area between the two partitions (23) and flows to the air outlet. The delay component (30) is located inside the inner cylinder (22) and can reduce the flow rate of gas in the spiral tube (24).

2. The oxygen-enriched air progressive precooling device for preventing thermal stress damage in cryogenic equipment according to claim 1, characterized in that, The inner cylinder (22) has an air inlet section (220), a gas precooling section (221) and an exhaust section (222). The gas precooling section (221) is located between the air inlet section (220) and the exhaust section (222). The air inlet section (220) and the exhaust section (222) are connected, while the gas precooling section (221) is not connected to the air inlet section (220) and the exhaust section (222).

3. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 1, characterized in that, Both ends of the spiral tube (24) are fixed with collars (25), and the separator (23) is provided with a circular hole (26) that matches the collar (25). The outer wall of the collar (25) is rotatably connected to the inner wall of the circular hole (26). The spiral tube (24), collar (25) and circular hole (26) are all coaxially arranged.

4. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 3, characterized in that, The delay component (30) includes an inner transmission component (31), an outer transmission component (32), and a drive component (33). The inner transmission component (31) includes a toothed ring (310) fixed on a collar (25). An annular plate (311) is fixed between two connecting plates. An inner toothed ring (312) is fixed on the inner wall of the annular plate (311), and the inner toothed ring (312) meshes with the toothed ring (310). When the annular plate (311) rotates, the inner toothed ring (312) and the toothed ring (310) can drive the spiral tube (24) to rotate.

5. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 4, characterized in that, The inner wall of the inner cylinder (22) is provided with an annular groove (313) that is adapted to the annular plate (311), and the outer wall of the annular plate (311) is slidably connected to the inner wall of the annular groove (313). The annular groove (313) is used to limit the position of the annular plate (311).

6. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 5, characterized in that, The external transmission component (32) includes an external gear ring (320) fixed to the outer wall of the annular plate (311), and the external gear ring (320) is located inside the annular groove (313). A linkage gear (321) is installed on the outside of the precooling box (21), and the linkage gear (321) meshes with the external gear ring (320). When the linkage gear (321) rotates axially, it can drive the annular plate (311) to slide inside the annular groove (313).

7. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 6, characterized in that, The inner cylinder (22) has a first receiving port (322), the precooling box (21) has a second receiving port (323), and the linkage gear (321) is located inside the first receiving port (322) and the second receiving port (323).

8. The oxygen-enriched air progressive precooling device for preventing thermal stress damage in cryogenic equipment according to claim 7, characterized in that, The drive unit (33) includes a rotating shaft (330) mounted on the linkage gear (321). The rotating shaft (330) can support the linkage gear (321). A support plate (331) is fixed to the outer wall of the precooling box (21). One end of the rotating shaft (330) is rotatably connected to the inner wall of the support plate (331). A drive source (332) is mounted on the top of the precooling box (21), and the output end of the drive source (332) is fixed to the other end of the rotating shaft (330).

9. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 1, characterized in that, The top and bottom of the precooling box (21) are respectively equipped with a water injection pipe (27) and a drain pipe (28). Water can be injected into the interior of the gas precooling section (221) through the water injection pipe (27), and the water inside the gas precooling section (221) can be discharged through the drain pipe (28).

10. The oxygen-enriched air progressive pre-cooling device for preventing thermal stress damage of cryogenic equipment according to claim 1, characterized in that, The air inlet of the precooling box (21) is connected to the exhaust of the air compressor (101) through a first air pipe. The gas after the air compressor (101) is working can enter the interior of the precooling box (21) through the first air pipe. The exhaust of the precooling box (21) is connected to the air inlet of the refrigeration component (102) through a second air pipe. The gas cooled by the precooling box (21) flows into the interior of the refrigeration component (102) through the second air pipe.

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