Energy-saving vacuum pressure swing adsorption oxygen production equipment

Abstract

The invention provides energy-saving vacuum pressure swing adsorption oxygen production equipment which comprises an air blower, a vacuum pump, a first adsorption tower, a second adsorption tower, an oxygen buffer tank, a dry air storage tank and a valve system, the air blower is respectively connected with the inlet ends of the first adsorption tower and the second adsorption tower through an air header pipe, a first air branch pipe and a second air branch pipe, and the air blower is also communicated with the atmosphere through a first blow-down pipe. Compared with the prior art, the device has the following beneficial effects that under the condition that the dry air storage tank H is adopted and no power equipment is additionally arranged, the vacuum pressure swing adsorption oxygen production process is completely met, product oxygen and oxygen-enriched air are not wasted, the recovery rate of the product oxygen is really improved, the yield of the product oxygen is improved by 5%-10%, and the production cost is reduced. The running cost of single-party product oxygen is reduced; meanwhile, compared with the prior art, the dosage of the oxygen production adsorbent G is reduced by 5%-8%, and the investment cost of oxygen production equipment is reduced.

Description

Technical Field

[0001] The invention discloses an energy-saving vacuum pressure swing adsorption oxygen production device, belonging to the field of pressure swing adsorption air separation oxygen production. Background Art

[0002] The vacuum pressure swing adsorption oxygen production system uses a blower to pressurize the raw air and send it into the adsorption tower. Different adsorbents loaded in the adsorption tower are used to selectively adsorb water (H2O), carbon dioxide (CO2) and nitrogen (N2) in the raw air under a positive relative pressure and below atmospheric pressure. The unabsorbed oxygen (O2) is discharged from the top outlet of the adsorption tower to the oxygen buffer tank as the product gas produced by the system for subsequent use. When the adsorbent is saturated with adsorption, a vacuum pump is used to evacuate and reduce the pressure of the adsorption tower, so that the water (H2O), carbon dioxide (CO2) and nitrogen (N2) adsorbed by the adsorbent are desorbed, and the adsorbent is regenerated. A double tower or multi-tower cycle is used to obtain an oxygen-rich product with a higher oxygen concentration (60-95%), thereby achieving continuous oxygen supply to the oxygen use point.

[0003] The existing vacuum pressure swing adsorption oxygen production system is usually composed of a blower, a vacuum pump, a switching valve, two identical adsorption towers (A, B), a product gas buffer tank, a control device and a pipeline system. From the bottom to the top of the adsorption tower, water absorbing adsorbents (such as activated alumina, silica gel, zeolite, 13X) for absorbing water (H2O) and carbon dioxide (CO2) and oxygen producing adsorbents (such as lithium-based molecular sieve LiX) for absorbing nitrogen (N2) are successively filled.

[0004] The raw air from the atmosphere passes through an air filter to remove solid particles such as dust, and then enters a blower for pressurization. The pressurized raw air is circulated into the adsorption towers (A, B) by a switching valve. The water (H2O), carbon dioxide (CO2) and nitrogen (N2) in the raw air are successively adsorbed by the corresponding adsorbents in the adsorption towers (A, B). The oxygen (O2) in the raw air flows out from the top of the adsorption towers (A, B) as a non-adsorbed component, enters the product gas buffer tank through a switching valve, and becomes the product gas produced by the system. This process is the adsorption oxygen production process.

[0005] When the adsorbent in the adsorption tower gradually reaches adsorption saturation, the adsorption tower is in the highest adsorption pressure state, and the pressure in the adsorption tower is usually between 120-160kpa.A, and the oxygen concentration gradient in the adsorption tower is: the air oxygen concentration at the bottom of the tower is about 21% and gradually transitions to 60-95% at the top of the tower (oxygen concentration of the adsorption end product). In order to improve the adsorption efficiency and increase the oxygen production capacity of the system, the high-pressure gas at the end of the adsorption tower after adsorption saturation is used as the equalizing gas, and is evenly fed into another adsorption tower at the end of vacuuming in the system through a switching valve for cleaning, and the pressure of the adsorption tower is reduced in the forward direction. This process is the equalizing pressure drop process, which prepares for the next vacuuming regeneration process.

[0006] After the pressure of the adsorption tower drops, the adsorption tower is evacuated with a vacuum pump to continue to reduce the pressure of the adsorption tower. The water (H2O), carbon dioxide (CO2) and nitrogen (N2) adsorbed in the adsorbent are gradually desorbed and pumped out to the atmosphere through the switching valve by the vacuum pump. The adsorbent is gradually regenerated. This process is the vacuum regeneration process.

[0007] In the middle and late stages of vacuuming the adsorption tower, in order to enhance the regeneration of the adsorbent, a small amount of product oxygen stored in the product gas buffer tank is refluxed from the top of the adsorption tower through a switching valve into the adsorption tower to backwash the adsorbent, so that the adsorbent can be completely regenerated. This process is called the backwashing process.

[0008] At the end of the vacuuming of the adsorption tower, the high-pressure gas at the adsorption end in another adsorption tower at the adsorption end in the system is used as the equalizing gas and enters the adsorption tower through the switching valve. This part of the equalizing gas is recovered and used to replace the low-oxygen concentrated exhaust gas at the bottom of the adsorption tower. This process is the equalizing pressure increase process, which prepares for the adsorption oxygen production process.

[0009] In short, each adsorption tower in the vacuum pressure swing adsorption oxygen production system will go through the following processes in an oxygen production cycle of the oxygen production system: raw air adsorption oxygen production - pressure drop - vacuum regeneration - backwashing - pressure rise. Two or more towers are operated in consecutive staggered steps. Under the control of a programmable controller, automatic cycle operation is achieved through a switching valve system.

[0010] The existing Chinese invention patent CN103058144A discloses a vacuum pressure swing adsorption oxygen production system and its control method: "The present invention is provided with two independent pressure equalizing tanks, and the forward pressure release is carried out twice. The oxygen-enriched air in the first adsorber is sent into the first pressure equalizing tank in the first forward pressure release, and the oxygen-enriched air is sent into the second pressure equalizing tank in the second forward pressure release. The gas released by the first forward pressure release is used as the gas for the first pressurizing step of the second adsorber, and the gas released by the second forward pressure release is used as the gas for the cleaning step of the first adsorber. Thus, the cleaning step does not use the product gas, which reduces the loss of the product gas, and only uses the gas released by the first forward pressure release to pressurize the adsorber, which can increase the overall oxygen concentration inside the adsorber and is beneficial to the adsorption operation. Therefore, the advantages of the present invention are that the loss of product oxygen is reduced, the distribution of oxygen concentration inside the adsorber is improved, thereby increasing the output of product oxygen, improving the efficiency of the adsorption operation, reducing energy consumption, and saving costs."

[0011] In this invention patent, although the cleaning step does not use product gas, it still uses oxygen-enriched air from the pressure equalizing tank (the oxygen purity of the oxygen-enriched air is higher than that of the air) for cleaning, which wastes part of the oxygen produced by the oxygen-producing adsorbent (lithium-based molecular sieve LiX) in the adsorption tower, which not only affects the increase in the product oxygen output, but also makes part of the oxygen-producing adsorbent (lithium-based molecular sieve LiX) play no substantial role, wastes part of the expensive oxygen-producing adsorbent (lithium-based molecular sieve LiX), and causes an increase in equipment investment cost and an increase in operating power consumption.

[0012] The existing Chinese utility model patent CN207324434U discloses a vacuum pressure swing adsorption oxygen production system with a product gas transition tank: "The utility model discloses a vacuum pressure swing adsorption oxygen production system with a product gas transition tank. The utility model sets a corresponding product gas transition tank for each adsorption tower. The product gas produced by the adsorption tower in each adsorption oxygen production process passes through the product gas transition tank in sequence and enters the product gas buffer tank. The high oxygen concentration part of the front section of the product gas enters the product gas buffer tank as the product gas of the oxygen production system, and the low oxygen concentration part of the rear section is temporarily stored in the product gas transition tank according to the oxygen concentration gradient of its output. When the corresponding adsorption tower is transferred to vacuum flushing regeneration and product gas pressure boosting, the temporarily stored low oxygen concentration product gas refluxes to the adsorption tower for use as flushing regeneration gas and product gas pressure boosting gas. The utility model has the following effects: improving the use efficiency of the adsorbent, improving the oxygen recovery rate of the system, saving system energy consumption, and reducing system costs."

[0013] In this utility model patent, the cleaning regeneration gas uses part of the low-oxygen concentrated product gas temporarily stored in the product gas transition tank to clean the vacuum adsorption tower, so that the water-absorbing adsorbent and oxygen-producing adsorbent in the adsorption tower can be completely regenerated. The oxygen purity of the low-oxygen concentrated product gas is higher than that of the air. During the cleaning step, most of the low-oxygen concentrated product gas will be pumped away by the vacuum pump, that is, the part of the low-concentration oxygen produced by the oxygen-producing adsorbent (lithium-based molecular sieve LiX) in the adsorption tower is still wasted, which not only affects the recovery rate of the product oxygen, but also makes part of the oxygen-producing adsorbent (lithium-based molecular sieve LiX) play no substantial role, and wastes part of the expensive oxygen-producing adsorbent (lithium-based molecular sieve LiX), resulting in increased equipment investment costs and increased operating power consumption. Summary of the invention

[0014] In view of the deficiencies in the prior art, the present invention aims to provide an energy-saving vacuum pressure swing adsorption oxygen production equipment.

[0015] In order to achieve the above object, the present invention is implemented through the following technical solutions:

[0016] An energy-saving vacuum pressure swing adsorption oxygen production equipment comprises a blower, a vacuum pump, a first adsorption tower, a second adsorption tower, an oxygen buffer tank, a dry air storage tank and a valve system, wherein the blower is connected to the inlet ends of the first adsorption tower and the second adsorption tower respectively through an air main pipe and a first air branch pipe and a second air branch pipe, and the blower is also connected to the atmosphere through a first vent pipe, the vacuum pump is connected to the inlet ends of the first adsorption tower and the second adsorption tower respectively through a vacuum main pipe and a first vacuum branch pipe and a second vacuum branch pipe, and the vacuum pump is also connected to the atmosphere through a second vent pipe, the outlet ends of the first adsorption tower and the second adsorption tower are respectively connected to one end of the air cleaning main pipe through a first pressure equalizing cleaning branch pipe and a second pressure equalizing cleaning branch pipe, the other end of the air cleaning main pipe is connected to the dry air storage tank, the outlet ends of the first adsorption tower and the second adsorption tower are respectively connected to one end of the oxygen main pipe through a first oxygen branch pipe and a second oxygen branch pipe, the other end of the oxygen main pipe is connected to the inlet of the oxygen buffer tank, and the outlet of the oxygen buffer tank is connected to the oxygen delivery main pipe.

[0017] Furthermore, both the first adsorption tower and the second adsorption tower are filled with two layers of adsorbent, wherein the adsorbent in the lower layer is a water-absorbing adsorbent, and the adsorbent in the upper layer is an oxygen-generating adsorbent.

[0018] Furthermore, one branch of the inlet of the dry air storage tank is connected to the top of the water-absorbing adsorbent in the first adsorption tower through a first dry air branch pipe, and another branch of the inlet of the dry air storage tank is connected to the top of the water-absorbing adsorbent in the second adsorption tower through a second dry air branch pipe. The inlet of the dry air storage tank is connected to the outlet ends of the first adsorption tower and the second adsorption tower through the air cleaning main pipe and the first pressure-equalizing cleaning branch pipe and the second pressure-equalizing cleaning branch pipe.

[0019] Further, the valve system includes a safety vent valve V1, a safety vent valve V2, an air intake switch valve V3-1, an air intake switch valve V3-2, an air extraction switch valve V4-1, an air extraction switch valve V4-2, a cleaning main valve V5, a cleaning switch valve V5-1, a cleaning switch valve V5-2, an oxygen production and oxygen return main valve V6, an oxygen production switch valve V6-1, an oxygen production switch valve V6-2, an oxygen supply valve V7, a check valve V8-1 and a check valve V8-2, the safety vent valve V1 and the safety vent valve V2 are respectively arranged on the first vent pipe P1 and the second vent pipe P2, the air intake switch valve V3-1 and the air intake switch valve V3-2 are respectively arranged on the first air branch pipe P3-1 and the second air branch pipe P3-2, the air extraction switch valve V4-1 and the air extraction The air switch valve 2 V4-2 is respectively arranged on the first vacuum branch pipe P4-1 and the second vacuum branch pipe P4-2, the cleaning main valve V5, the cleaning switch valve 1 V5-1 and the cleaning switch valve 2 V5-2 are respectively arranged on the air cleaning main pipe P5, the first pressure-equalizing cleaning branch pipe P5-1 and the second pressure-equalizing cleaning branch pipe P5-2, the oxygen production and oxygen return main valve V6, the oxygen production switch valve 1 V6-1 and the oxygen production switch valve 2 V6-2 are respectively arranged on the oxygen main pipe P6, the first oxygen branch pipe P6-1 and the second oxygen branch pipe P6-2, the oxygen supply valve V7 is arranged on the oxygen delivery main pipe P7, the check valve 1 V8-1 and the check valve 2 V8-2 are respectively arranged on the first dry air branch pipe P8-1 and the second dry air branch pipe P8-2.

[0020] Further, the first vent pipe, the second vent pipe, the air main pipe, the first air branch pipe, the second air branch pipe, the vacuum main pipe, the first vacuum branch pipe, the second vacuum branch pipe, the air cleaning main pipe, the first pressure-equalizing cleaning branch pipe, the second pressure-equalizing cleaning branch pipe, the oxygen main pipe, the first oxygen branch pipe, the second oxygen branch pipe, the oxygen delivery main pipe, the first dry air branch pipe and the second dry air branch pipe are all composed of pipelines, and the pipelines include pipeline connectors and pipeline monomers, and two adjacent pipeline monomers are connected by the pipeline connectors, and the pipeline connectors include connecting pipelines and two pipeline monomers. A connector, the two connectors are movably connected to the two ends of the connecting pipe, an ear plate is fixed to the outer surface of one end of the connecting pipe near the connector, an adjustment ring groove is respectively provided on both sides of the inside of the connecting pipe, an adjustment ring is slidably connected inside the adjustment ring groove, a bellows is connected between the outer surface of one side of the adjustment ring and the inner wall of the adjustment ring groove, the outer surface of the other side of the adjustment ring is rotatably connected to the end of the connecting inner pipe, the connecting inner pipe is linearly slidably connected inside the connector, an external thread 1 is provided on the outer surface of the connecting inner pipe, and an internal thread 1 matching the external thread 1 is provided on the inner wall of the opening of the connecting pipe 1.

[0021] Furthermore, a guide groove 1 is provided on the inner wall of the adjustment ring groove, a guide block 1 is fixed on the outer surface of the adjustment ring, the guide block 1 is slidably connected in the guide groove 1, a guide block 2 is fixed on the outer surface of the connecting inner tube, a guide groove 2 matching with the guide block 2 is provided on the inner wall of the connecting head, an annular slider is fixed on the end of the connecting inner tube, and an annular sliding groove matching with the annular slider is provided on the outer surface of the adjustment ring.

[0022] Furthermore, the pipeline monomer includes a delivery pipe and two delivery heads, the two delivery heads are respectively arranged at both ends of the delivery pipe, a through delivery channel is opened between the delivery pipe and the delivery heads, a sealing mechanism is arranged in the inner wall of the delivery head, and a limiting component cooperating with the sealing mechanism is arranged on the outer surface of the delivery head.

[0023] Furthermore, the blocking mechanism includes a plurality of sliding grooves evenly arranged in the inner wall of the conveying head, the end of the sliding groove passes through the outer surface of the conveying head, the sliding groove is connected to the conveying head at one end thereof with a sliding groove matching with a triangular blocking plate, the sliding groove is slidably connected to a sliding plate inside the sliding groove, one end of the sliding plate is located in the sliding groove and is fixedly connected to the triangular blocking plate, the end of the triangular blocking plate passes through the conveying channel inside the conveying head, an inclined surface is provided on the outer surface of the triangular blocking plate near the opening of the conveying channel, a plurality of the triangular blocking plates are assembled into a circular plate structure matching with the conveying channel, a sliding block is fixed to the side of the sliding plate, the sliding block is slidably connected to the sliding groove, and a spring is provided between the sliding block and the inner wall of the sliding groove.

[0024] Furthermore, the limiting assembly includes a limiting hole opened on the sliding plate and two external threads opened on the circumferential outer surface of the conveying head, an internal thread ring is threadedly sleeved on the external thread two, an end of the internal thread ring is rotatably connected to a sliding ring linearly slidably connected to the outer surface of the conveying head, and a limiting block matching the limiting hole is fixed to the end of the sliding ring.

[0025] Furthermore, the ear plate, the connecting head and the conveying head are connected and fixed by means of long locking bolts, and bolt holes matching with the long locking bolts are provided on the ear plate, the connecting head and the conveying head.

[0026] Beneficial effects of the present invention:

[0027] The present invention not only fully meets the vacuum pressure swing adsorption oxygen production process, but also does not waste product oxygen and oxygen-enriched air, while adopting a dry air storage tank H and without adding additional power equipment. It truly improves the recovery rate of product oxygen, increases the product oxygen output by 5%-10%, and reduces the operating cost of a single product oxygen. At the same time, compared with the existing patented technology, the amount of oxygen-producing adsorbent G is reduced by 5%-8%, thereby reducing the investment cost of oxygen production equipment.

[0028] The present invention utilizes the water-absorbing adsorbent F loaded in the adsorption tower to prepare dry and clean air, and then, through the storage of the dry air storage tank H, the molecular sieve in the adsorption tower is thoroughly cleaned and regenerated according to the vacuum pressure swing adsorption oxygen production process sequence and the switching of the valve, so as to achieve the purpose of not wasting product oxygen and oxygen-enriched air and reducing the amount of molecular sieve used.

[0029] The present invention uses a pipeline composed of pipeline connectors and pipeline monomers, so that during use of the pipeline, the pipeline connectors or pipeline monomers can be partially replaced according to the damage of the pipeline, thereby reducing the cost of pipeline maintenance.

[0030] The present invention adopts the design of the blocking mechanism so that when the connection between the pipeline connector and the pipeline monomer is released during pipeline maintenance, the end of the pipeline monomer can be blocked by the blocking mechanism to prevent liquid leakage from the maintenance end of the pipeline monomer.

[0031] The present invention adopts the design of the limiting component, so that when the pipeline is in normal use or during pipeline maintenance, before releasing the connection between the pipeline connector and the pipeline monomer, the expanded blocking mechanism can be limited, so as to facilitate the end of the pipeline connector to be drawn out from the pipeline monomer. After releasing the connection between the pipeline connector and the pipeline monomer, the blocking mechanism housed in the delivery head can be limited, so as to prevent the blocking mechanism from moving arbitrarily and causing leakage of liquid in the delivery head.

[0032] The present invention adopts the design of the inclined surface to facilitate the insertion of the connecting inner tube in the pipeline connector into the conveying channel inside the conveyor. The plugging mechanism can be squeezed and pushed by squeezing the connecting inner tube and the inclined surface on the triangular sealing plate, thereby realizing the connection action between the pipeline connector and the pipeline monomer. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0034] Figure 1 It is a structural schematic diagram of an energy-saving vacuum pressure swing adsorption oxygen production equipment of the present invention;

[0035] Figure 2 This is a schematic diagram of the pipeline structure of an energy-saving vacuum pressure swing adsorption oxygen production equipment of the present invention;

[0036] Figure 3 This is a schematic diagram of the structure of a pipeline connector for an energy-saving vacuum pressure swing adsorption oxygen production equipment according to the present invention;

[0037] Figure 4 It is a schematic diagram of the connection structure of the connecting inner pipe, the second guide block and the annular slider of an energy-saving vacuum pressure swing adsorption oxygen production equipment of the present invention;

[0038] Figure 5 It is a schematic diagram of the connection structure of the adjustment ring, the guide block 1 and the bellows of an energy-saving vacuum pressure swing adsorption oxygen production equipment of the present invention;

[0039] Figure 6 This is a schematic diagram of the pipeline monomer structure of an energy-saving vacuum pressure swing adsorption oxygen production equipment of the present invention;

[0040] Figure 7 The present invention is a schematic diagram of the partial structure of a pipeline monomer of an energy-saving vacuum pressure swing adsorption oxygen production equipment.

[0041] In the figure, A, blower; B, vacuum pump; C, first adsorption tower; D, second adsorption tower; E, oxygen buffer tank; F, water absorbing adsorbent; G, oxygen generating adsorbent; H, dry air storage tank; P1, first vent pipe; P2, second vent pipe; P3, air main pipe; P3-1, first air branch pipe; P3-2, second air branch pipe; P4, vacuum main pipe; P4-1, first vacuum branch pipe; P4-2, second vacuum branch pipe; P5, air cleaning main pipe; P5- 1. First pressure-equalizing cleaning branch pipe; P5-2, second pressure-equalizing cleaning branch pipe; P6, oxygen main pipe; P6-1, first oxygen branch pipe; P6-2, second oxygen branch pipe; P7, oxygen delivery main pipe; P8-1, first dry air branch pipe; P8-2, second dry air branch pipe; V1, safety vent valve 1; V2, safety vent valve 2; V3-1, air intake switch valve 1; V3-2, air intake switch valve 2; V4-1, exhaust switch valve 1; V4-2, exhaust switch Valve 2; V5, cleaning main valve; V5-1, cleaning switch valve 1; V5-2, cleaning switch valve 2; V6, oxygen production and oxygen return main valve; V6-1, oxygen production switch valve 1; V6-2, oxygen production switch valve 2; V7, oxygen supply valve; V8-1, check valve 1; V8-2, check valve 2; 1, connecting pipe; 2, connector; 3, ear plate; 4, adjusting ring groove; 5, guide groove 1; 6, adjusting ring; 7, guide block 1; 8, bellows; 9, connecting inner pipe; 10, outer Thread one; 11. Internal thread one; 12. Guide block two; 13. Guide groove two; 14. Delivery channel; 15. Annular slider; 16. Delivery pipe; 17. Delivery head; 18. Sliding groove; 19. Sliding groove; 20. Sliding plate; 21. Triangular blocking plate; 22. Inclined surface; 23. Sliding block; 24. Spring; 25. Limiting hole; 26. External thread two; 27. Internal thread ring; 28. Sliding ring; 29. ​​Limiting block; 30. Long locking bolt; 31. Bolt hole. DETAILED DESCRIPTION

[0042] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0043] See also Figure 1The present invention provides a technical solution for an energy-saving vacuum pressure swing adsorption oxygen production equipment, comprising a blower A, a vacuum pump B, a first adsorption tower C, a second adsorption tower D, an oxygen buffer tank E, a dry air storage tank H and a valve system, wherein the blower A is connected to the inlet ends of the first adsorption tower C and the second adsorption tower D respectively through an air main pipe P3 and a first air branch pipe P3-1 and a second air branch pipe P3-2, and the blower A is also connected to the atmosphere through a first vent pipe P1, and the vacuum pump B is connected to the inlet ends of the first adsorption tower C and the second adsorption tower D respectively through a vacuum main pipe P4 and a first vacuum branch pipe P4-1 and a second vacuum branch pipe P4-2, and the vacuum pump B is also connected to the atmosphere through a second vent pipe P2, and the first adsorption tower C and the second adsorption tower D are connected to the first adsorption tower C and the second adsorption tower D. The outlet ends of the first adsorption tower C and the second adsorption tower D are respectively connected to one end of the air cleaning main pipe P5 through the first pressure-equalizing cleaning branch pipe P5-1 and the second pressure-equalizing cleaning branch pipe P5-2, and the other end of the air cleaning main pipe P5 is connected to the dry air storage tank H. The outlet ends of the first adsorption tower C and the second adsorption tower D are respectively connected to one end of the oxygen main pipe P6 through the first oxygen branch pipe P6-1 and the second oxygen branch pipe P6-2, and the other end of the oxygen main pipe P6 is connected to the inlet of the oxygen buffer tank E, and the outlet of the oxygen buffer tank E is connected to the oxygen delivery main pipe P7. The first adsorption tower C and the second adsorption tower D are both filled with two layers of adsorbent, wherein the adsorbent in the lower layer is a water-absorbing adsorbent F (such as 13X), and the adsorbent in the upper layer is an oxygen-producing adsorbent G (such as lithium molecular sieve L iX), a special adsorption tower structure allows part of the dry air to enter the dry air storage tank H directly through the first dry air branch pipe P8-1 without passing through the oxygen-producing adsorbent G on the upper layer of the adsorption tower C, and be stored there, in preparation for the subsequent cleaning and regeneration of the adsorbent;One branch of the inlet of the dry air storage tank H is connected to the top of the water-absorbing adsorbent F in the first adsorption tower C through the first dry air branch pipe P8-1, and another branch of the inlet of the dry air storage tank H is connected to the top of the water-absorbing adsorbent F in the second adsorption tower D through the second dry air branch pipe P8-2. The inlet of the dry air storage tank H is connected to the outlet ends of the first adsorption tower C and the second adsorption tower D through the air cleaning main pipe P5 and the first pressure-equalizing cleaning branch pipe P5-1 and the second pressure-equalizing cleaning branch pipe P5-2. The valve system includes a safety vent valve 1 V1, a safety vent valve 2 V2, an air inlet valve 3, and a safety vent valve 4. The switch valve 1 V3-1, the air intake switch valve 2 V3-2, the exhaust switch valve 1 V4-1, the exhaust switch valve 2 V4-2, the cleaning main valve V5, the cleaning switch valve 1 V5-1, the cleaning switch valve 2 V5-2, the oxygen production and oxygen return main valve V6, the oxygen production switch valve 1 V6-1, the oxygen production switch valve 2 V6-2, the oxygen supply valve V7, the check valve 1 V8-1 and the check valve 2 V8-2, the safety vent valve 1 V1 and the safety vent valve 2 V2 are respectively arranged on the first vent pipe P1 and the second vent pipe P2, the air intake switch valve 1 V3-1 and the air intake switch valve 2 V3-2 are respectively arranged on the first air branch pipe P 3-1 and the second air branch pipe P3-2, the exhaust switch valve 1 V4-1 and the exhaust switch valve 2 V4-2 are respectively arranged on the first vacuum branch pipe P4-1 and the second vacuum branch pipe P4-2, the cleaning main valve V5, the cleaning switch valve 1 V5-1 and the cleaning switch valve 2 V5-2 are respectively arranged on the air cleaning main pipe P5, the first pressure-equalizing cleaning branch pipe P5-1 and the second pressure-equalizing cleaning branch pipe P5-2, the oxygen production and oxygen return main valve V6, the oxygen production switch valve 1 V6-1 and the oxygen production switch valve 2 V6-2 are respectively arranged on the oxygen main pipe P6, the first On the oxygen branch pipe P6-1 and the second oxygen branch pipe P6-2, the oxygen delivery valve V7 is arranged on the oxygen delivery main pipe P7, and the check valve 1 V8-1 and the check valve 2 V8-2 are arranged on the first dry air branch pipe P8-1 and the second dry air branch pipe P8-2 respectively; the present invention uses the water-absorbing adsorbent F filled in the adsorption tower to produce dry and clean air, and then through the storage of the dry air storage tank H, according to the vacuum pressure swing adsorption oxygen production process sequence and the switching of the valve, the molecular sieve in the adsorption tower is thoroughly cleaned and regenerated, so as to achieve the purpose of not wasting product oxygen and oxygen-enriched air and reducing the amount of molecular sieve used. ;

[0044] Taking the first adsorption tower C as an example, the air imported through the first adsorption tower C, in the pressure-boosting adsorption stage, first passes through the water-absorbing adsorbent F located in the lower layer of the adsorption tower C to absorb water (H2O) and carbon dioxide (CO2), and then forms dry and clean air, wherein part of the dry air does not pass through the oxygen-producing adsorbent G in the upper layer of the adsorption tower C, that is, without the participation of the oxygen-producing adsorbent G (reducing the amount of the oxygen-producing adsorbent G), and directly enters the dry air storage tank H through the first dry air branch pipe P8-1 for storage, in preparation for the subsequent cleaning and regeneration of the adsorbent; when the first adsorption tower C is in the cleaning stage, by opening the cleaning main valve V5 and the pressure-equalizing cleaning branch valve V5-1, the pressurized dry and clean gas in the dry air storage tank H can quickly enter the first adsorption tower C in the negative pressure stage, thereby achieving thorough cleaning and regeneration of the adsorbent.

[0045] See also Figure 2-Figure 5, the first vent pipe P1, the second vent pipe P2, the air main pipe P3, the first air branch pipe P3-1, the second air branch pipe P3-2, the vacuum main pipe P4, the first vacuum branch pipe P4-1, the second vacuum branch pipe P4-2, the air cleaning main pipe P5, the first pressure-equalizing cleaning branch pipe P5-1, the second pressure-equalizing cleaning branch pipe P5-2, the oxygen main pipe P6, the first oxygen branch pipe P6-1, the second oxygen branch pipe P6-2, the oxygen delivery main pipe P7, the first dry air branch pipe The pipe P8-1 and the second dry air branch pipe P8-2 are both composed of pipelines, and the pipelines include pipeline connectors and pipeline monomers. Two adjacent pipeline monomers are connected by the pipeline connectors. The pipeline connectors include a connecting pipeline 1 and two connectors 2. The two connectors 2 are movably connected to the two ends of the connecting pipeline 1. An ear plate 3 is fixed on the outer surface of one end of the connecting pipeline 1 close to the connector 2. An adjusting ring groove 4 is respectively opened on both sides of the interior of the connecting pipeline 1. An adjusting ring 6 is slidably connected inside the adjusting ring groove 4. A bellows 8 is connected between the outer surface of one side of the adjusting ring 6 and the inner wall of the adjusting ring groove 4, and the outer surface of the other side of the adjusting ring 6 is rotatably connected to the end of the connecting inner tube 9, and the connecting inner tube 9 is linearly slidably connected to the inside of the connecting head 2. The outer surface of the connecting inner tube 9 is provided with an external thread 10, and the inner wall of the opening of the connecting pipe 1 is provided with an internal thread 11 that matches the external thread 10. A guide groove 5 is provided on the inner wall of the adjusting ring groove 4, and a guide block 7 is fixed to the outer surface of the adjusting ring 6, and the guide block 7 is slidably connected to the inside of the connecting head 2. The connecting inner tube 9 is connected to the guide groove 1 5, and a guide block 2 12 is fixed on the outer surface of the connecting inner tube 9. A guide groove 2 13 matching with the guide block 2 12 is provided on the inner wall of the connecting head 2. An annular slider 15 is fixed to the end of the connecting inner tube 9, and an annular slide groove matching with the annular slider 15 is provided on the outer surface of the adjusting ring 6. The pipeline composed of the pipeline connector and the pipeline monomer can perform local pipeline connector or pipeline monomer replacement work according to the damage of the pipeline during use, thereby reducing the cost of pipeline maintenance.

[0046] See also Figure 6 and Figure 7The pipeline monomer includes a delivery pipe 16 and two delivery heads 17, the two delivery heads 17 are respectively arranged at the two ends of the delivery pipe 16, a through delivery channel 14 is opened between the delivery pipe 16 and the delivery head 17, a blocking mechanism is arranged in the inner wall of the delivery head 17, and a limiting component matched with the blocking mechanism is arranged on the outer surface of the delivery head 17, and the blocking mechanism includes a plurality of sliding grooves 18 evenly arranged in the inner wall of the delivery head 17, the end of the sliding groove 18 passes through the outer surface of the delivery head 17, and the sliding groove 18 is connected to the delivery head 17. One end is provided with a sliding groove 19 matched with a triangular blocking plate 21, and the sliding groove 18 is slidably connected with a sliding plate 20 inside, and the sliding plate 20 is located in the sliding groove 19 at one end and The triangular sealing plate 21 is fixedly connected, and the end of the triangular sealing plate 21 passes through the conveying channel 14 inside the conveying head 17. An inclined surface 22 is provided on the outer surface of the triangular sealing plate 21 near the opening end of the conveying channel 14. Several triangular sealing plates 21 are assembled into a circular plate structure that matches the conveying channel 14. A sliding block 23 is fixed on the side of the sliding plate 20. The sliding block 23 is slidably connected in the slide groove 19, and a spring 24 is provided between the sliding block 23 and the inner wall of the slide groove 19. Through the design of the sealing mechanism, when the connection relationship between the pipeline connector and the pipeline monomer is released during pipeline maintenance, the end of the pipeline monomer can be sealed by the sealing mechanism to prevent liquid leakage at the maintenance end of the pipeline monomer.

[0047] See also Figure 6-Figure 7 The limiting assembly includes a limiting hole 25 provided on the sliding plate 20 and an external thread 26 provided on the outer circumferential surface of the delivery head 17, an internal thread ring 27 is threadedly sleeved on the external thread 26, and the end of the internal thread ring 27 is rotatably connected to a sliding ring 28 linearly slidably connected to the outer surface of the delivery head 17, and a limiting block 29 matching the limiting hole 25 is fixed to the end of the sliding ring 28; through the design of the limiting assembly, the expanded blocking mechanism can be limited when the pipeline is in normal use and during pipeline maintenance, before the connection relationship between the pipeline connector and the pipeline monomer is released, so that the end of the pipeline connector can be pulled out of the pipeline monomer, and after the connection relationship between the pipeline connector and the pipeline monomer is released, the blocking mechanism stored in the delivery head 17 can be limited to prevent the blocking mechanism from moving arbitrarily and causing leakage of liquid in the delivery head.

[0048] See also Figure 2 and Figure 6The ear plate 3, the connecting head 2 and the conveying head 17 are connected and fixed by a locking long bolt 30, and the ear plate 3, the connecting head 2 and the conveying head 17 are all provided with a bolt hole 31 matched with the locking long bolt 30.

[0049] When in use, the pipe connector and the pipe monomer are locked together by the locking long bolt 30. When it is necessary to replace a local pipe monomer, the locking long bolt 30 is removed from the pipe connector and the pipe monomer, and then the connecting pipe 1 is rotated. While the connecting pipe 1 is rotating, the threaded drive of the external thread 10 and the internal thread 11, as well as the rotation limit of the guide block 2 and the guide groove 2 13, allow the connecting inner tube 9 to move linearly in the connecting head 2, so that one end of the connecting inner tube 9 is pulled out from the delivery head 17 and gradually moved and stored in the connecting head 2, and the other end of the connecting inner tube 9 is gradually inserted into the connecting pipe 1. At the same time, the setting of the bellows 8 can meet the movement action between the connecting inner tube 9 and the inner wall of the connecting pipe 1 and the implementation of the liquid delivery action. In the process of pulling the end of the connecting inner tube 9 out of the delivery head 17, the three The extrusion limit at the end of the corner sealing plate 21, at this time, the internal thread ring 27 is rotated, and the internal thread ring 27 and the external thread 26 can act together to rotate and move on the delivery head 17. While the internal thread ring 27 rotates and moves, the end will pull the sliding ring 28 connected to it for rotation to move, and the sliding ring 28 will slide linearly on the delivery head 17. While the sliding ring 28 moves, it will pull the limit block 29 at the end to disengage from the limit hole 25 on the sliding plate 20. Under the action of the spring 24, the sliding plate 20 and the triangular sealing plate 21 are reset and moved, thereby pushing the triangular sealing plate 21 to be inserted into the interior of the delivery head 17. Several triangular sealing plates 21 are assembled into a circular plate structure inside the delivery head 17 to achieve the blocking of the delivery head 17 to prevent liquid leakage. At the same time, an elastic sealing pad can be provided on the outer surface of the end of the triangular sealing plate 21 to achieve the sealing action between the slide groove 19 and the delivery head 17.

[0050] Although this specification is described according to implementation modes, not every implementation mode includes only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. An energy-saving vacuum pressure swing adsorption oxygen production equipment, characterized in that: The invention comprises a blower (A), a vacuum pump (B), a first adsorption tower (C), a second adsorption tower (D), an oxygen buffer tank (E), a dry air storage tank (H) and a valve system, wherein the blower (A) is connected to the inlet ends of the first adsorption tower (C) and the second adsorption tower (D) through an air main pipe (P3) and a first air branch pipe (P3-1) and a second air branch pipe (P3-2), respectively; the blower (A) is also connected to the atmosphere through a first vent pipe (P1); the vacuum pump (B) is connected to the inlet ends of the first adsorption tower (C) and the second adsorption tower (D) through a vacuum main pipe (P4) and a first vacuum branch pipe (P4-1) and a second vacuum branch pipe (P4-2), respectively; the vacuum pump (B) is also connected to the inlet ends of the first adsorption tower (C) and the second adsorption tower (D) through a second vent pipe (P1); The air pipe (P2) is connected to the atmosphere; the outlet ends of the first adsorption tower (C) and the second adsorption tower (D) are respectively connected to one end of an air cleaning main pipe (P5) through a first pressure-equalizing cleaning branch pipe (P5-1) and a second pressure-equalizing cleaning branch pipe (P5-2); the other end of the air cleaning main pipe (P5) is connected to the dry air storage tank (H); the outlet ends of the first adsorption tower (C) and the second adsorption tower (D) are respectively connected to one end of an oxygen main pipe (P6) through a first oxygen branch pipe (P6-1) and a second oxygen branch pipe (P6-2); the other end of the oxygen main pipe (P6) is connected to an inlet of the oxygen buffer tank (E); and the outlet of the oxygen buffer tank (E) is connected to an oxygen delivery main pipe (P7).

2. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 1 is characterized in that: The first adsorption tower (C) and the second adsorption tower (D) are both filled with two layers of adsorbent, wherein the adsorbent in the lower layer is a water-absorbing adsorbent (F) and the adsorbent in the upper layer is an oxygen-generating adsorbent (G).

3. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 2 is characterized in that: One branch of the inlet of the dry air storage tank (H) is connected to the top of the water-absorbing adsorbent (F) in the first adsorption tower (C) through the first dry air branch pipe (P8-1), and the other branch of the inlet of the dry air storage tank (H) is connected to the top of the water-absorbing adsorbent F in the second adsorption tower (D) through the second dry air branch pipe (P8-2). The inlet of the dry air storage tank (H) is connected to the outlet ends of the first adsorption tower (C) and the second adsorption tower (D) through the air cleaning main pipe (P5) and the first pressure-equalizing cleaning branch pipe (P5-1) and the second pressure-equalizing cleaning branch pipe (P5-2).

4. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 3 is characterized in that: The valve system comprises a safety vent valve 1 (V1), a safety vent valve 2 (V2), an air intake switch valve 1 (V3-1), an air intake switch valve 2 (V3-2), an air extraction switch valve 1 (V4-1), an air extraction switch valve 2 (V4-2), a cleaning main valve (V5), a cleaning switch valve 1 (V5-1), a cleaning switch valve 2 (V5-2), an oxygen production and oxygen return main valve (V6), an oxygen production switch valve 1 (V6-1), an oxygen production switch valve 2 (V6-2), an oxygen supply valve (V7 ), check valve 1 (V8-1) and check valve 2 (V8-2), the safety vent valve 1 (V1) and the safety vent valve 2 (V2) are respectively arranged on the first vent pipe (P1) and the second vent pipe (P2), the air intake switch valve 1 (V3-1) and the air intake switch valve 2 (V3-2) are respectively arranged on the first air branch pipe (P3-1) and the second air branch pipe (P3-2), the exhaust switch valve 1 (V4-1) and the exhaust switch valve 2 (V4-2) are respectively arranged on the first air branch pipe (P3-1) and the second air branch pipe (P3-2), The second air switch valve (V4-2) is respectively arranged on the first vacuum branch pipe (P4-1) and the second vacuum branch pipe (P4-2); the cleaning main valve (V5), the cleaning switch valve one (V5-1) and the cleaning switch valve two (V5-2) are respectively arranged on the air cleaning main pipe (P5), the first pressure equalizing cleaning branch pipe (P5-1) and the second pressure equalizing cleaning branch pipe (P5-2); the oxygen production and oxygen return main valve (V6), the oxygen production switch valve one (V5-1) and the cleaning switch valve two (V5-2) are respectively arranged on the air cleaning main pipe (P5), the first pressure equalizing cleaning branch pipe (P5-1) and the second pressure equalizing cleaning branch pipe (P5-2); The shut-off valve 1 (V6-1) and the oxygen-producing switch valve 2 (V6-2) are respectively arranged on the oxygen main pipe (P6), the first oxygen branch pipe (P6-1) and the second oxygen branch pipe (P6-2); the oxygen supply valve (V7) is arranged on the oxygen delivery main pipe (P7); the check valve 1 (V8-1) and the check valve 2 (V8-2) are respectively arranged on the first dry air branch pipe (P8-1) and the second dry air branch pipe (P8-2).

5. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 3 is characterized in that: The first vent pipe (P1), the second vent pipe (P2), the air main pipe (P3), the first air branch pipe (P3-1), the second air branch pipe (P3-2), the vacuum main pipe (P4), the first vacuum branch pipe (P4-1), the second vacuum branch pipe (P4-2), the air cleaning main pipe (P5), the first pressure-equalizing cleaning branch pipe (P5-1), the second pressure-equalizing cleaning branch pipe (P5-2), the oxygen main pipe (P6), the first oxygen branch pipe (P6-1), the second oxygen branch pipe (P6-2), the oxygen delivery main pipe (P7), the first dry air branch pipe (P8-1) and the second dry air branch pipe (P8-2) are all composed of pipelines, and the pipelines include pipeline connectors and pipeline monomers, and two adjacent pipeline monomers are connected by the pipeline connectors, and the pipeline connectors include connecting members. A connecting pipe (1) and two connecting heads (2), the two connecting heads (2) are movably connected to the two ends of the connecting pipe (1), an ear plate (3) is fixed on the outer surface of one end of the connecting pipe (1) close to the connecting head (2), an adjusting ring groove (4) is respectively provided on both sides of the inside of the connecting pipe (1), an adjusting ring (6) is slidably connected inside the adjusting ring groove (4), a bellows (8) is connected between the outer surface of one side of the adjusting ring (6) and the inner wall of the adjusting ring groove (4), the outer surface of the other side of the adjusting ring (6) is rotatably connected to the end of a connecting inner pipe (9), the connecting inner pipe (9) is linearly slidably connected inside the connecting head (2), an outer surface of the connecting inner pipe (9) is provided with an external thread (10), and an internal thread (11) matching the external thread (10) is provided on the inner wall of the opening of the connecting pipe (1).

6. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 5, characterized in that: A guide groove (5) is provided on the inner wall of the adjusting ring groove (4); a guide block (7) is fixed on the outer surface of the adjusting ring (6); the guide block (7) is slidably connected in the guide groove (5); a guide block (12) is fixed on the outer surface of the connecting inner tube (9); a guide groove (13) matching with the guide block (12) is provided on the inner wall of the connecting head (2); an annular sliding block (15) is fixed at the end of the connecting inner tube (9); and an annular sliding groove matching with the annular sliding block (15) is provided on the outer surface of the adjusting ring (6).

7. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 6, characterized in that: The pipeline monomer comprises a delivery pipe (16) and two delivery heads (17), the two delivery heads (17) being respectively arranged at two ends of the delivery pipe (16), a through delivery channel (14) being provided between the delivery pipe (16) and the delivery heads (17), a blocking mechanism being provided in the inner wall of the delivery head (17), and a limit assembly cooperating with the blocking mechanism being provided on the outer surface of the delivery head (17).

8. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 7, characterized in that: The blocking mechanism comprises a plurality of sliding grooves (18) uniformly arranged in the inner wall of the conveying head (17), the ends of the sliding grooves (18) extending through the outer surface of the conveying head (17), one end of the sliding groove (18) communicating with the conveying head (17) being provided with a sliding groove (19) cooperating with a triangular blocking plate (21), the interior of the sliding groove (18) being slidably connected with a sliding plate (20), one end of the sliding plate (20) being located in the sliding groove (19) being fixedly connected with the triangular blocking plate (21), and the triangular blocking plate (21) being fixedly connected with the triangular blocking plate (21). ) is inserted into the conveying channel (14) inside the conveying head (17); an inclined surface (22) is provided on the outer surface of the triangular sealing plate (21) near the opening of the conveying channel (14); a plurality of the triangular sealing plates (21) are assembled into a circular plate structure that matches the conveying channel (14); a sliding block (23) is fixed to the side of the sliding plate (20); the sliding block (23) is slidably connected in the slide groove (19); a spring (24) is provided between the sliding block (23) and the inner wall of the slide groove (19).

9. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 8, characterized in that: The limiting assembly comprises a limiting hole (25) provided on the sliding plate (20) and an external thread (26) provided on the outer circumferential surface of the delivery head (17); an internal thread ring (27) is threadedly sleeved on the external thread (26); an end of the internal thread ring (27) is rotatably connected to a sliding ring (28) linearly slidably connected to the outer surface of the delivery head (17); a limiting block (29) matching the limiting hole (25) is fixed to the end of the sliding ring (28).

10. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 9, characterized in that: The ear plate (3), the connecting head (2) and the conveying head (17) are connected and fixed by means of a locking long bolt (30); and bolt holes (31) matching with the locking long bolt (30) are provided on the ear plate (3), the connecting head (2) and the conveying head (17).

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