An energy-saving vacuum pressure swing adsorption oxygen production equipment

Abstract

The present invention provides an energy-saving vacuum pressure swing adsorption oxygen production equipment, including 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 present invention has the following beneficial effects. When the dry air storage tank H is used and no additional power equipment is added, 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, and 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, the amount of oxygen-producing adsorbent G used is reduced by 5%-8% compared with the existing patented technology, thereby reducing the investment cost of the oxygen production equipment.

Description

Technical Field

[0001] The invention relates to energy-saving vacuum pressure swing adsorption oxygen production equipment, belonging to the field of pressure swing adsorption air separation and 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. The different adsorbents loaded in the adsorption tower 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 as the product gas produced by the system to the oxygen buffer tank 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] Existing vacuum pressure swing adsorption oxygen production systems typically consist of a blower, vacuum pump, switching valve, two identical adsorption towers (A and B), a product gas buffer tank, control devices, and piping systems. The adsorption towers are sequentially loaded from bottom to top with water-absorbing adsorbents (such as activated alumina, silica gel, zeolite, and 13X) that absorb water (H2O) and carbon dioxide (CO2), and oxygen-producing adsorbents (such as lithium-based molecular sieves LiX) that absorb nitrogen (N2).

[0004] The raw air from the atmosphere passes through an air filter to remove dust and other solid particles, and then enters the blower for pressurization. The pressurized raw air is circulated and sent to the adsorption towers (A, B) through the 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 the 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 reaches its highest adsorption pressure, typically between 120-160 kPa.A. The oxygen concentration gradient within the adsorption tower is as follows: approximately 21% of the air oxygen concentration at the bottom of the tower gradually transitions to 60-95% at the top of the tower (the oxygen concentration of the adsorption end product). To improve adsorption efficiency and increase the system's oxygen production capacity, the high-pressure gas at the end of the adsorption tower after adsorption saturation is used as equalizing gas. This gas is then fed through a switching valve to another adsorption tower in the system at the end of vacuuming for cleaning, thereby reducing the pressure of the adsorption tower. This process is called equalizing pressure drop and prepares for the next vacuuming and regeneration process.

[0006] After the pressure in the adsorption tower drops, the adsorption tower is evacuated with a vacuum pump to continue reducing 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 used to flow back into the adsorption tower from the top of the adsorption tower through the switching valve to perform backwashing on 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 waste gas at the bottom of the adsorption tower. This process is the equalizing pressure rising process, which prepares for the adsorption oxygen production process.

[0009] In summary, each adsorption tower in a vacuum pressure swing adsorption oxygen production system undergoes the following five processes within a single oxygen production cycle: adsorption of feed air to produce oxygen – pressure drop – vacuum regeneration – backwashing – and pressure rise. Two or more towers operate in staggered phases. Automatic cyclic operation is achieved through a switching valve system under the control of a programmable controller.

[0010] The existing Chinese invention patent CN103058144A discloses a vacuum pressure swing adsorption oxygen production system and its control method: "The present invention sets up two independent pressure equalizing tanks, and the forward pressure release is carried out twice. The first forward pressure release sends the oxygen-enriched air in the first adsorber into the first pressure equalizing tank, and the second forward pressure release sends the oxygen-enriched air into the second pressure equalizing tank. 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 product gas, which reduces the loss of 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, which 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 air) for cleaning, which wastes part of the oxygen produced by the oxygen-producing adsorbent (lithium-based molecular sieve LiX) in the adsorption tower. This not only affects the increase in product oxygen production, 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] 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 provides a corresponding product gas transition tank for each adsorption tower. The product gas produced by the adsorption tower during each adsorption oxygen production process passes through the product gas transition tank in sequence and then enters the product gas buffer tank. The high-oxygen-concentrated portion 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-concentrated portion 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 switches to vacuum flushing regeneration and product gas pressure boosting, this temporarily stored low-oxygen-concentrated product gas is refluxed to the adsorption tower for use as flushing regeneration gas and product gas pressure boosting gas. The effects of this utility model are: improving the efficiency of adsorbent use, 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 utilizes a portion of the low-oxygen concentrated product gas temporarily stored in the product gas transition tank to clean the vacuum adsorption tower, allowing the water-absorbing adsorbent and oxygen-producing adsorbent in the adsorption tower to be completely regenerated. The oxygen purity of the low-oxygen concentrated product gas is higher than that of air. During the cleaning step, most of the low-oxygen concentrated product gas will be pumped away by the vacuum pump. That is, the low-concentration oxygen produced by the oxygen-producing adsorbent (lithium-based molecular sieve LiX) in the adsorption tower is still wasted. This not only affects the recovery rate of the product oxygen, but also makes some of the oxygen-producing adsorbent (lithium-based molecular sieve LiX) play no substantial role, wasting some 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 shortcomings of the existing technology, 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 includes 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. 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. 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. 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. 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] Furthermore, the valve system includes 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 return oxygen main valve V6, an oxygen production switch valve 1 V6-1, an oxygen production switch valve 2 V6-2, an oxygen supply valve V7, a check valve 1 V8-1 and a 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 air extraction switch valve 1 V4-1 and the The second exhaust switch valve V4-2 is respectively arranged on the first vacuum branch pipe P4-1 and the second vacuum branch pipe P4-2; the main cleaning valve V5, the first cleaning switch valve V5-1 and the second cleaning switch valve 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 return oxygen main valve V6, the oxygen production switch valve V6-1 and the second oxygen production switch valve 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 first check valve V8-1 and the second check valve V8-2 are respectively arranged on the first dry air branch pipe P8-1 and the second dry air branch pipe P8-2.

[0020] Furthermore, 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 pipes, and the pipes include pipe connectors and pipe monomers, and two adjacent pipe monomers are connected by the pipe connectors, and the pipe connectors include connecting pipes and two The two connecting heads are movably connected to the two ends of the connecting pipe respectively, and an ear plate is fixed to the outer surface of the connecting pipe near one end of the connecting head. An adjustment ring groove is respectively provided on both sides of the interior of the connecting pipe, and an adjustment ring is slidably connected inside the adjustment ring groove. A bellows is connected between the outer surface of one side of the adjusting ring and the inner wall of the adjusting ring groove. The outer surface of the other side of the adjusting ring is rotatably connected to the end of the connecting inner pipe, and the connecting inner pipe is linearly slidably connected to the inside of the connecting head, and an external thread is provided on the outer surface of the connecting inner pipe, and an internal thread matching the external thread is provided on the inner wall of the opening of the connecting pipe.

[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, and 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 is provided on the inner wall of the connecting head to cooperate with the guide block 2, an annular slider is fixed on the end of the connecting inner tube, and an annular sliding groove is provided on the outer surface of the adjustment ring to cooperate with the annular slider.

[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 provided in the inner wall of the delivery head, and a limiting component cooperating with the sealing mechanism is provided on the outer surface of the delivery head.

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

[0024] Furthermore, the limiting assembly includes a limiting hole provided on the sliding plate and an external thread No. 2 provided on the circumferential outer surface of the conveying head. An internal thread ring is threadedly sleeved on the external thread No. 2. The end of the internal thread ring is rotatably connected to a sliding ring linearly slidably connected to the outer surface of the conveying head. 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 locking long bolts, and the ear plate, the connecting head and the conveying head are all provided with bolt holes that match the locking long bolts.

[0026] Beneficial effects of the present invention:

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

[0028] The present invention utilizes the water-absorbing adsorbent F filled in the adsorption tower to produce dry and clean air, stores the dry air in the dry air storage tank H, and then according to the vacuum pressure swing adsorption oxygen production process sequence and valve switching, realizes the thorough cleaning and regeneration of the molecular sieve in the adsorption tower, 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 the pipeline connectors or pipeline monomers can be partially replaced according to the damage of the pipeline during use, 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 extraction of the end of the pipeline connector 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 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 pipe connector into the conveying channel inside the conveyor. The blocking 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 between the pipe connector and the pipe 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 following briefly introduces the drawings required for use in the embodiments. 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 any creative work.

[0034] Figure 1 This is a schematic structural diagram of an energy-saving vacuum pressure swing adsorption oxygen production equipment according to 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 pipeline connectors for an energy-saving vacuum pressure swing adsorption oxygen production equipment according to the present invention;

[0037] Figure 4 This is a schematic diagram of the connection structure of the inner connecting 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 This is a schematic diagram of the connection structure of the adjustment ring, guide block 1 and 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 structure of an energy-saving vacuum pressure swing adsorption oxygen production equipment of the present invention;

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

[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. Inlet on / off valve 1; V3-2. Inlet on / off valve 2; V4-1. Exhaust on / off valve 1; V4-2. Exhaust on / off valve Valve 2; V5, cleaning main valve; V5-1, cleaning switch valve 1; V5-2, cleaning switch valve 2; V6, oxygen production and return oxygen 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, connecting head; 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. Conveying channel; 15. Annular slider; 16. Conveying pipe; 17. Conveying head; 18. Sliding groove; 19. Sliding groove; 20. Sliding plate; 21. Triangular sealing 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. Locking long bolt; 31. Bolt hole. DETAILED DESCRIPTION

[0042] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. 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 making creative efforts 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. 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. 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 respectively through a vacuum main pipe P4 and a first vacuum branch pipe P4-1 and a second vacuum branch pipe P4-2. The vacuum pump B is also connected to the atmosphere through a second vent pipe P2. The outlet ends of the first adsorption tower C and the second adsorption tower D are respectively connected to the air cleaning main pipe P5-1 and the second pressure equalizing cleaning branch pipe P5-2. 5, 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, 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 LiX). The 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 in the upper layer of the adsorption tower C, and be stored in preparation for subsequent adsorbent cleaning and regeneration;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. The valve system includes a safety vent valve 1 V1, a safety vent valve 2 V2, an air inlet valve, and a valve. On-off valve 1 V3-1, air intake on-off valve 2 V3-2, air extraction on-off valve 1 V4-1, air extraction on-off valve 2 V4-2, cleaning main valve V5, cleaning on-off valve 1 V5-1, cleaning on-off valve 2 V5-2, oxygen production and return oxygen main valve V6, oxygen production on-off valve 1 V6-1, oxygen production on-off valve 2 V6-2, 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 on-off valve 1 V3-1 and the air intake on-off 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 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 return oxygen 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 pressure-equalizing cleaning branch pipe P5-1 and the second pressure-equalizing cleaning branch pipe P5-2, The oxygen supply valve V7 is installed on the oxygen branch pipe P6-1 and the second oxygen branch pipe P6-2, and the first check valve V8-1 and the second check valve V8-2 are installed on the first dry air branch pipe P8-1 and the second dry air branch pipe P8-2, respectively. The present invention utilizes the water-absorbing adsorbent F loaded in the adsorption tower to produce dry, clean air. This air is then stored in the dry air storage tank H. The molecular sieve in the adsorption tower is then thoroughly cleaned and regenerated according to the vacuum pressure swing adsorption oxygen production process sequence and valve switching, thereby avoiding waste of 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 entering through the first adsorption tower C first passes through the water-absorbing adsorbent F in the lower layer of the adsorption tower C during the pressure-boosting adsorption stage to absorb water (H2O) and carbon dioxide (CO2), thereby forming dry and clean air. Some of this dry air, without passing 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 oxygen-producing adsorbent G), directly enters the dry air storage tank H through the first dry air branch pipe P8-1 for storage, preparing for subsequent adsorbent cleaning and regeneration. 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 air 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 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 pipes, which include pipe connectors and pipe monomers. Two adjacent pipe monomers are connected by the pipe connectors. The pipe connectors include a connecting pipe 1 and two connectors 2. The two connectors 2 are movably connected to the two ends of the connecting pipe 1. An ear plate 3 is fixed to the outer surface of one end of the connecting pipe 1 close to the connector 2. An adjustment ring groove 4 is respectively opened on both sides of the interior of the connecting pipe 1. An adjustment ring 6 is slidably connected to the interior of 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 the connecting inner tube 9. 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. 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. A guide block 7 is fixed to the outer surface of the adjusting ring 6. The guide block 7 is slidably connected to the inside of the connecting head 2. Connected in the guide groove 1 5, the outer surface of the connecting inner tube 9 is fixed with a guide block 2 12, the inner wall of the connecting head 2 is provided with a guide groove 2 13 that cooperates with the guide block 2 12, the end of the connecting inner tube 9 is fixed with an annular slider 15, and the outer surface of the adjusting ring 6 is provided with an annular slide groove that cooperates with the annular slider 15; the pipeline composed of the pipeline connector and the pipeline monomer can be partially replaced with the pipeline connector or the pipeline monomer according to the damage of the pipeline during use, thereby reducing the cost of pipeline maintenance.

[0046] See 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 both ends of the delivery pipe 16. A through delivery channel 14 is provided between the delivery pipe 16 and the delivery head 17. A blocking mechanism is provided in the inner wall of the delivery head 17. The outer surface of the delivery head 17 is provided with a limiting component that cooperates with the blocking mechanism. The blocking mechanism includes a number of sliding grooves 18 evenly provided 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. The sliding groove 18 is connected to the delivery head 17 at one end and is provided with a slide groove 19 that cooperates with a triangular blocking plate 21. The sliding groove 18 is slidably connected to the inside of the sliding groove 18. The sliding plate 20 is located in the slide groove 19 and one end is connected to the 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. The outer surface of the triangular sealing plate 21 is provided with an inclined surface 22 near the opening end of the conveying channel 14. Several triangular sealing plates 21 are assembled into a circular plate structure that cooperates with 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 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 surface of the circumference of the delivery head 17. The external thread 26 is threadedly sleeved with an internal thread ring 27. The end of the internal thread ring 27 is rotatably connected to a sliding ring 28 that is linearly slidably connected to the outer surface of the delivery head 17. The end of the sliding ring 28 is fixed with a limiting block 29 that cooperates with the limiting hole 25. Through the design of the limiting assembly, the expanded sealing mechanism can be limited before the connection relationship between the pipeline connector and the pipeline monomer is released during normal use of the pipeline and during pipeline maintenance, so that the end of the pipeline connector can be conveniently withdrawn from the pipeline monomer. After the connection relationship between the pipeline connector and the pipeline monomer is released, the sealing mechanism housed in the delivery head 17 can be limited to prevent the sealing mechanism from moving arbitrarily and causing leakage of liquid in the delivery head.

[0048] See 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. The ear plate 3, the connecting head 2 and the conveying head 17 are all provided with a bolt hole 31 that matches 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 a local pipe monomer needs to be replaced, the locking long bolt 30 is removed from the pipe connector and the pipe monomer. Then, the connecting pipe 1 is rotated. While the connecting pipe 1 rotates, the threaded drive of the external thread 10 and the internal thread 11, coupled with the rotation limit of the guide block 2 and the guide groove 2, allows 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 accommodated in the connecting head 2, and the other end of the connecting inner tube 9 is gradually inserted into the interior of 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 be threaded and rotated on the delivery head 17. When the internal thread ring 27 rotates, 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. When 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 sealing 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 sealing between the slide groove 19 and the delivery head 17.

[0050] Although this specification is described according to implementation methods, not every implementation method contains only one independent technical solution. This narrative method 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 can also be appropriately combined to form other implementation methods 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. 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), 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 atmosphere through a vacuum main pipe (P4), a first vacuum branch pipe (P4-1) and a second vacuum branch pipe (P3-2). The branch pipe (P4-2) is connected to the inlet ends of the first adsorption tower (C) and the second adsorption tower (D) respectively. The vacuum pump (B) is also connected to the atmosphere through the second vent pipe (P2). The outlet ends of the first adsorption tower (C) and the second adsorption tower (D) are 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). The other end of the air cleaning main pipe (P5) is connected to the dry air storage tank (H). The first adsorption tower (C) and the second adsorption tower ( D) The outlet ends of the two 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), 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) and the adsorbent in the upper layer is an oxygen-generating adsorbent (G). The inlet of the dry air storage tank (H) One branch is connected to the top of the water-absorbing adsorbent (F) in the first adsorption tower (C) through a first dry air branch pipe (P8-1), and another branch at 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 a 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).

2. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 1, characterized in that: The valve system includes 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 return oxygen 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 air extraction switch valve 1 (V4-1) and the The second exhaust 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 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 return oxygen 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); and 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).

3. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 2, 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 A connecting pipe (1) and two connecting heads (2), wherein the two connecting heads (2) are movably connected to the two ends of the connecting pipe (1), and an ear plate (3) is fixed to the outer surface of one end of the connecting pipe (1) near the connecting head (2). An adjusting ring groove (4) is respectively provided on both sides of the interior of the connecting pipe (1), and 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 the connecting inner pipe (9), and the connecting inner pipe (9) is linearly slidably connected inside the connecting head (2). An outer thread (10) is provided on the outer surface of the connecting inner pipe (9), and an inner thread (11) matching the outer thread (10) is provided on the inner wall of the opening of the connecting pipe (1).

4. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 3, 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), and 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) is provided on the inner wall of the connecting head (2) to match the guide block (12), an annular slider (15) is fixed at the end of the connecting inner tube (9), and an annular sliding groove is provided on the outer surface of the adjusting ring (6) to match the annular slider (15).

5. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 4, 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 both 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 position limiting component cooperating with the blocking mechanism being provided on the outer surface of the delivery head (17).

6. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 5, 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) is provided with a sliding groove (19) cooperating with a triangular blocking plate (21), the interior of the sliding groove (18) is slidably connected to a sliding plate (20), one end of the sliding plate (20) located in the sliding groove (19) is fixedly connected to the triangular blocking plate (21), and the triangular blocking plate (21) is provided with a plurality of sliding grooves (18) uniformly arranged in the inner wall of the conveying head (17), and the end of the sliding groove (18) is fixedly connected to the triangular blocking plate (21), and the triangular blocking plate (21) is fixedly connected to the triangular blocking plate (21). ) is inserted into the conveying channel (14) inside the conveying head (17), and 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). 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), and the sliding block (23) is slidably connected in the chute (19). A spring (24) is provided between the sliding block (23) and the inner wall of the chute (19).

7. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 6, characterized in that: 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); 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); and a limiting block (29) matching the limiting hole (25) is fixed to the end of the sliding ring (28).

8. The energy-saving vacuum pressure swing adsorption oxygen production equipment according to claim 7, characterized in that: The 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) that matches the locking long bolt (30).

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