A pressure swing adsorption oxygen production system and oxygen production process

Abstract

The present invention relates to a pressure swing adsorption oxygen production system and an oxygen production process thereof. The pressure swing adsorption oxygen production system comprises at least 2n adsorption systems and n blowers, the blowers being connected in parallel with the adsorption towers of the adsorption systems, where n is a natural number not less than 1; the adsorption system comprises a product gas tank, a vacuum pump and two adsorption towers, the product gas tank being connected in parallel with the gas production outlet of the adsorption tower, the blowers being connected in parallel with the bottom openings of the adsorption towers for inputting raw gas, and the vacuum pump being also connected in parallel with the bottom openings of the adsorption towers for exhausting gas when the adsorption towers are depressurized; the interior of the adsorption tower comprises, from outside to inside, an air inlet area, an adsorption area and an air outlet area, the bottom of the air inlet area being connected to the bottom opening of the adsorption tower, a plurality of adsorption disks being arranged from top to bottom in the adsorption area, the adsorption disks comprising a plurality of adsorption blocks, the adsorption disks being connected to a movable rack close to the inner wall of the adsorption tower by connecting cables, and the adsorption blocks being movable between the adsorption disks and the movable rack by the connecting cables.

Description

Technical Field

[0001] The present invention belongs to the technical field of pressure swing oxygen production, and in particular relates to a pressure swing adsorption oxygen production system and an oxygen production process thereof. Background Art

[0002] With the development of industrial oxygen production technology, industrial oxygen is widely used in industries such as steel, nonferrous metallurgy, chemicals, furnaces, glass, and papermaking. Industrial oxygen production uses air as a raw material, and oxygen is typically extracted from the air through physical methods. In the early years, cryogenic technology was the primary method, but cryogenics are expensive. Recently, pressure swing adsorption (PSA) has been developed for oxygen production at room temperature. This method uses an adsorbent material that selectively adsorbs nitrogen. It adsorbs nitrogen and other impurities from the air under high pressure, allowing oxygen to pass through the adsorbent to produce high-purity oxygen. The adsorbent is then desorbed and regenerated at a reduced pressure. The pressure fluctuations during the oxygen production process also require power equipment, which is a major energy consumer. For example, a blower is required to supply raw air to the adsorption tower. After adsorption is complete, the blower is vented for standby use. Venting the blower also consumes energy, raising the question of how to effectively utilize the blower to reduce energy consumption and adjust production capacity.

[0003] In addition, the adsorption towers currently used are radial adsorption towers. The adsorption materials are regularly packed in the adsorption zone between the air inlet zone and the air outlet zone. The raw gas must pass through the adsorption zone from the outside to the inside. There is a problem. When the adsorption of the outer layer adsorbent is close to saturation, the raw gas still has to pass through the adsorption zone along the original path. Not only is the resistance large, but also part of the effective adsorption time is wasted, resulting in increased energy consumption and cost. Summary of the Invention

[0004] In view of the above problems, the present invention provides a pressure swing adsorption oxygen production system and an oxygen production process thereof, wherein the pressure swing adsorption oxygen production system comprises at least 2n adsorption systems and n blowers, the blowers being connected in parallel with the adsorption towers of the adsorption systems, where n is a natural number not less than 1;

[0005] The adsorption system includes a product gas tank, a vacuum pump and two adsorption towers. The product gas tank is connected in parallel to the gas outlet of the adsorption tower. A blower is connected in parallel to the bottom opening of the adsorption tower for inputting raw gas. The vacuum pump is also connected in parallel to the bottom opening of the adsorption tower for exhausting when the adsorption tower is depressurized.

[0006] The interior of the adsorption tower includes an air inlet area, an adsorption area and an air outlet area from the outside to the inside. The bottom of the air inlet area is connected to the bottom opening of the adsorption tower. Several adsorption disks are arranged from top to bottom in the adsorption area. The adsorption disks include several adsorption blocks. The adsorption disks are connected to the movable rack near the inner wall of the adsorption tower by connecting ropes. The adsorption blocks can move between the adsorption disks and the movable rack through the connecting ropes.

[0007] Optionally, a gas outlet is provided at the top of the adsorption tower, and the gas outlets of the two adsorption towers of the same adsorption system are also connected to each other. The bottom opening of the adsorption tower of the adsorption system is connected to the outlet pipe, the outlet pipe is connected to the inlet of the three-way valve, the vacuum pump is connected to the first outlet of the three-way valve of the two adsorption towers in parallel through the pipe, and the blower is connected to the second outlet of the three-way valve of the two adsorption towers in parallel through the pipe.

[0008] Optionally, the adsorption tower is cylindrical, and the adsorption zone and the air inlet zone are both circular and sequentially surround the outside of the air outlet zone; a cylindrical positioning cylinder is provided between the adsorption zone and the air outlet zone to define the position of the adsorption block in the innermost circle of the adsorption disk;

[0009] A lower baffle is provided at the bottom of the adsorption tower. The lower baffle is circular and located above the bottom opening. The diameter of the lower baffle is not less than the outer diameter of the adsorption disk and is used to block the raw gas input from the bottom opening.

[0010] Further optionally, the top of the gas outlet zone is connected to a gas production outlet via a gas outlet pipe, so that the obtained high-purity oxygen is discharged from the adsorption tower.

[0011] Further optionally, the positioning cylinder is a frame structure composed of a plurality of vertical rods and horizontal circles to form a mesh;

[0012] A rotating motor is provided above or below the adsorption tower. The rotating shaft connected to the rotating motor penetrates into the adsorption tower and is connected to the inner wall of the top or bottom of the positioning cylinder through several connecting rods, which can drive the positioning cylinder to rotate.

[0013] Optionally, the adsorption disk is annular, and includes a plurality of adsorption rings from the outside to the inside, all of which are concentrically arranged and layered around the adsorption disk, and the diameter of the adsorption ring gradually decreases from the outside to the inside;

[0014] The adsorption ring is composed of several adsorption blocks spliced ​​horizontally from left to right. The adsorption block is fan-shaped and hollow inside for filling adsorption materials. The adsorption block is a mesh cage with evenly distributed mesh holes on the surface to facilitate the entry of raw gas into the adsorption block.

[0015] Optionally, the inner side surface of the innermost adsorption ring of the adsorption disk is in close contact with the outer side surface of the positioning cylinder to prevent the adsorption disk from entering the air outlet area; a plurality of connecting ropes are connected above the positioning cylinder corresponding to an adsorption disk, and the number of connecting ropes corresponding to an adsorption disk is the same as the number of its adsorption blocks, and the connecting rope passes above the center line of the corresponding adsorption block, that is, the center line of the adsorption block corresponding to the connecting rope, and a connecting ring is provided in the middle of the top surface of the adsorption block for being sleeved on the corresponding connecting rope, and a driving device is provided on the connecting ring for driving the adsorption block to slide along the corresponding connecting rope;

[0016] The end points of the connecting rope corresponding to the same adsorption disk are connected to different positions at the same horizontal height of the mobile rack, so that the adsorption blocks of the same adsorption disk can be arranged in a circle at the same height along the circumference of the adsorption tower on the mobile rack.

[0017] Optionally, the movable frame is cylindrical and is arranged close to the inner wall of the adsorption tower and at a certain distance from the inner wall; the movable frame includes a plurality of vertical rods and a plurality of rotating rings, and the vertical rods are evenly arranged along the circumference of the inner wall of the adsorption tower to provide support for the rotating rings;

[0018] The rotating ring is arranged on the vertical rod from top to bottom, and the rotating ring corresponds to the adsorption plate one by one; the rotating ring includes an outer ring and an inner ring. The outer side of the outer ring is fixedly connected to a plurality of vertical rods, and the inner side is provided with a guide rail. The inner ring is slidably connected to the guide rail so that the inner ring can rotate horizontally along the guide rail.

[0019] The end points of the plurality of connecting cables are connected to corresponding positions on the inner side surface of the inner circle, so that the adsorption blocks of the same adsorption disk are arranged in sequence along the corresponding inner circle without overlapping.

[0020] Further optionally, the top of the movable rack is connected to a lifting device, which is provided on the top of the inner wall of the adsorption tower and is used to control the vertical height of the movable rack.

[0021] The oxygen production process of the pressure swing adsorption oxygen production system includes the following steps:

[0022] (1) The first adsorption system includes adsorption tower A, adsorption tower B, product gas tank 1 and vacuum pump 1; the second adsorption system includes adsorption tower C, adsorption tower D, product gas tank 2 and vacuum pump 2; the blowers are connected in parallel with adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D;

[0023] (2) The blower inputs the raw gas to the adsorption tower A, and the adsorption tower A adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 1. At the same time, the adsorption tower B completes the previous round of adsorption and two equalization pressure drops. At this time, the vacuum pump 1 vacuums and desorbs the adsorption tower B;

[0024] At the same time, the previous round of adsorption in adsorption tower D is completed, and the gas production outlet of adsorption tower D is only connected to the gas production outlet of adsorption tower C, releasing the excess pressure of adsorption tower D into adsorption tower C, the pressure of adsorption tower D drops for the first time, the pressure of adsorption tower C rises for the first time, and adsorption tower C continues to be vacuumed for desorption; then, adsorption tower D continues to release the excess pressure into adsorption tower C, the pressure of adsorption tower D drops for the second time, and at the same time, vacuum pump 2 is switched and connected to adsorption tower D, vacuuming and desorbing adsorption tower D, and the pressure of adsorption tower C rises for the second time;

[0025] (3) Adsorption tower A adsorbs oxygen, while adsorption tower B is vacuuming and desorbing. The gas outlet of adsorption tower A is connected in parallel to product gas tank 1 and the gas outlet of adsorption tower B, and the gas produced by adsorption tower A is used to flush the adsorption bed of adsorption tower B;

[0026] At the same time, the adsorption tower D continues to evacuate and desorb, and the gas outlet of the adsorption tower C is connected to the product gas tank 2, which is used for final filling with the gas produced therein to prepare for the next adsorption oxygen production;

[0027] (4) After oxygen production is completed in adsorption tower A, the gas outlet of adsorption tower A is connected only to the gas outlet of adsorption tower B, and the excess pressure of adsorption tower A is released into adsorption tower B. The pressure of adsorption tower A decreases for the first time, and the pressure of adsorption tower B increases for the first time. Adsorption tower B continues to evacuate and desorb;

[0028] At the same time, the blower switches to connect to adsorption tower C, inputs raw gas to adsorption tower C, adsorption tower C adsorbs and produces oxygen, and the product oxygen is input into product gas tank 2. At the same time, adsorption tower D completes the previous round of adsorption and two equalization pressure drops. At this time, vacuum pump 2 evacuates and desorbs adsorption tower D;

[0029] (5) Adsorption tower A continues to release excess pressure into adsorption tower B, and adsorption tower A is pressure-reduced for the second time. At the same time, the vacuum pump is switched to adsorption tower A to evacuate and desorb adsorption tower A, and adsorption tower B is pressure-raised for the second time.

[0030] At the same time, adsorption tower C continues to adsorb oxygen, while adsorption tower D continues to vacuum and desorb;

[0031] (6) Adsorption tower A continues to evacuate and desorb, and the gas outlet of adsorption tower B is connected to product gas tank 1, and the gas produced therein is used for final filling;

[0032] At the same time, adsorption tower C continues to adsorb oxygen, while adsorption tower D is evacuated for desorption. The gas output of adsorption tower C is connected in parallel to product gas tank 2 and the gas output of adsorption tower D, and the gas output of adsorption tower C is used to flush the adsorption bed of adsorption tower D.

[0033] (7) After the oxygen production in adsorption tower C is completed, the blower inputs the raw gas to adsorption tower B, adsorption tower B adsorbs and produces oxygen, and the product oxygen is input into product gas tank 1, while adsorption tower A continues to evacuate and desorb;

[0034] At the same time, the gas production outlet of adsorption tower C is only connected to the gas production outlet of adsorption tower D, and the excess pressure of adsorption tower C is released into adsorption tower D. The pressure of adsorption tower C drops for the first time, and the pressure of adsorption tower D rises for the first time. Adsorption tower D continues to be vacuumed and desorbed. Then, adsorption tower C continues to release the excess pressure into adsorption tower D. The pressure of adsorption tower C drops for the second time. At the same time, vacuum pump 2 is switched and connected to adsorption tower C to vacuum and desorb adsorption tower C, and the pressure of adsorption tower D rises for the second time.

[0035] (8) Adsorption tower B adsorbs oxygen, and at the same time, while adsorption tower A is evacuated for desorption, the gas outlet of adsorption tower B is connected in parallel to product gas tank 1 and the gas outlet of adsorption tower A, and the gas produced by adsorption tower B is used to flush the adsorption bed of adsorption tower A;

[0036] At the same time, the adsorption tower C continues to evacuate and desorb, and the gas outlet of the adsorption tower D is connected to the product gas tank 2, and the gas produced therein is used for final filling;

[0037] (9) After oxygen production is completed in adsorption tower B, the gas production outlet of adsorption tower B is only connected to the gas production outlet of adsorption tower A, and the excess pressure of adsorption tower B is released into adsorption tower A. The pressure of adsorption tower B is reduced for the first time, and the pressure of adsorption tower A is increased for the first time. Adsorption tower A continues to be vacuumed and desorbed; then, adsorption tower B continues to release the excess pressure into adsorption tower A, and the pressure of adsorption tower B is reduced for the second time. At the same time, the vacuum pump is switched to be connected to adsorption tower B, and the pressure of adsorption tower B is increased for the second time.

[0038] At the same time, the blower inputs raw gas to the adsorption tower D, which adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 2. At the same time, the adsorption tower C continues to vacuum and desorb;

[0039] (10) Adsorption tower B continues to evacuate and desorb, and the gas outlet of adsorption tower A is connected to product gas tank 1, and the gas produced therein is used for final filling to prepare for the next adsorption oxygen production;

[0040] Adsorption tower D absorbs and produces oxygen. At the same time, while adsorption tower C is evacuated and desorbed, the gas output outlet of adsorption tower D is connected in parallel to product gas tank 2 and the gas output outlet of adsorption tower D. The gas output of adsorption tower D is used to flush the adsorption bed of adsorption tower C.

[0041] After step (10), the operation of step (2) is repeated, and the two adsorption systems can be operated continuously in combination.

[0042] Optionally, the adsorption tower in the present invention is filled with adsorption material, and the adsorption material is selected from one or more of Li-LSX molecular sieve, Sr-LSX molecular sieve, Ca-LSX molecular sieve, Ca-Li-LSX molecular sieve, and 5A molecular sieve.

[0043] Optionally, the adsorption pressure inside the adsorption tower is 35-60 kPa, optimized to 40-55 kPa; the desorption pressure of the adsorption tower is -65 to -35 kPa, optimized to -55 to -40 kPa. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a structural schematic diagram of the adsorption tower of Example 1;

[0045] Figure 2 1 is a top view of the adsorption tower of Example 1;

[0046] Figure 3 Schematic diagram of the coordination between the adsorption disk and the connecting cable of Example 1;

[0047] Figure 4Schematic diagram of the structure of the positioning cylinder of Example 1;

[0048] Figure 5 This is a process diagram of the pressure swing adsorption oxygen production system of Example 2;

[0049] Figure 6 This is an operational flow chart of the oxygen production process of Example 2;

[0050] Figure 7 This is a process diagram of the pressure swing adsorption oxygen production system of Comparative Example 1;

[0051] Figure 8 This is an operational flow chart of the oxygen production process of Comparative Example 1.

[0052] In the accompanying drawings, 1-blower, 2-product gas tank one, 3-product gas tank two, 4-vacuum pump one, 5-vacuum pump two, 6-gas outlet, 7-bottom opening, 8-air inlet area, 9-adsorption area, 10-air outlet area, 11-adsorption plate, 12-adsorption block, 13-movable frame, 14-connecting rope, 15-positioning cylinder, 16-lower partition, 17-upper partition, 18-rotating motor, 19-connecting rod, 20-adsorption ring, 21-connecting ring, 22-vertical rod, 23-rotating ring, 24-outer ring, 25-inner ring. DETAILED DESCRIPTION

[0053] Example 1

[0054] This embodiment provides a pressure swing adsorption oxygen production system, such as Figures 1-4 As shown, it includes two adsorption systems and a blower 1, and the blower 1 is connected in parallel to the adsorption tower of the adsorption system;

[0055] The adsorption system includes a product gas tank, a vacuum pump and two adsorption towers. The product gas tank is connected in parallel to the gas outlet 6 of the adsorption tower. The blower 1 is connected in parallel to the bottom opening 7 of the adsorption tower for inputting raw gas. The vacuum pump is also connected in parallel to the bottom opening 7 of the adsorption tower for exhausting when the adsorption tower is depressurized.

[0056] The interior of the adsorption tower includes an air inlet area 8, an adsorption area 9 and an air outlet area 10 from the outside to the inside. The bottom of the air inlet area 8 is connected to the bottom opening 7 of the adsorption tower. A number of adsorption disks 11 are provided from top to bottom in the adsorption area 9. The adsorption disk 11 includes a number of adsorption blocks 12. The adsorption disk 11 is connected to a movable rack 13 close to the inner wall of the adsorption tower by a connecting rope 14. The adsorption block 12 can move between the adsorption disk 11 and the movable rack 13 through the connecting rope 14.

[0057] A gas production outlet 6 is provided at the top of the adsorption tower, and the gas production outlets of the two adsorption towers of the same adsorption system are also connected to each other. The bottom opening 7 of the adsorption tower of the adsorption system is connected to the outlet pipe, and the outlet pipe is connected to the inlet of the three-way valve. The vacuum pump is connected to the first outlet of the three-way valve of the two adsorption towers in parallel through a pipe, and the blower is connected to the second outlet of the three-way valve of the two adsorption towers in parallel through a pipe.

[0058] Valves are provided on the connecting pipelines between the product gas tank, vacuum pump, blower 1, gas outlet of the adsorption tower and the bottom opening to facilitate the control of the opening and closing of different pipelines.

[0059] The adsorption tower is cylindrical, and the adsorption zone 9 and the air inlet zone 8 are both circular and sequentially surround the outside of the air outlet zone 10; a cylindrical positioning cylinder 15 is provided between the adsorption zone 9 and the air outlet zone 10 to define the position of the adsorption block 12 on the innermost circle of the adsorption disk 11;

[0060] A lower baffle 16 is provided at the bottom of the adsorption tower. The lower baffle 16 is circular and is located above the bottom opening 7. The diameter of the lower baffle 16 is not less than the outer diameter of the adsorption disk 11. It is used to block the raw gas input from the bottom opening 7, so that the raw gas flows radially along the bottom of the adsorption tower to the bottom of the outermost air inlet area 8 of the adsorption tower, and then flows upward along the air inlet area 8 to the adsorption area 9.

[0061] An upper baffle 17 is provided on the top of the adsorption zone 9 and the air inlet zone 8 . The upper baffle 17 is annular and is used to prevent the gas from directly rising from the adsorption zone 9 and the air inlet zone 8 and being discharged from the gas production outlet 6 .

[0062] The positioning cylinder 15 is a frame structure composed of a number of vertical rods and horizontal circles to form a mesh;

[0063] A rotating motor 18 is provided above the adsorption tower. The rotating shaft connected to the rotating motor 18 penetrates into the adsorption tower and is connected to the inner wall of the top of the positioning cylinder 15 through a plurality of connecting rods 19, which can drive the positioning cylinder 15 to rotate.

[0064] The adsorption disk 11 is annular and includes a plurality of adsorption rings 20 from the outside to the inside. All adsorption rings 20 are concentrically arranged and surround the adsorption disk 11 in layers. The diameter of the adsorption rings 20 gradually decreases from the outside to the inside.

[0065] The adsorption ring 20 is composed of several adsorption blocks 12 spliced ​​horizontally from left to right. The adsorption block 12 is fan-shaped and hollow inside for filling adsorption material. The adsorption block 12 is a mesh cage with mesh holes evenly distributed on the surface to facilitate the entry of raw gas into the adsorption block 12.

[0066] The adsorption blocks 12 of the two adjacent adsorption rings 20 are staggered in the horizontal direction to prevent the center lines of the two adsorption blocks 12 corresponding to the inner and outer ring positions from being on the same radial line.

[0067] The inner side of the adsorption ring 20 on the innermost side of the adsorption disk is in close contact with the outer side of the positioning cylinder 15 to prevent the adsorption disk 11 from entering the air outlet area 10; the positioning cylinder 15 is connected to a plurality of connecting ropes 14 above each adsorption disk 11, and the number of connecting ropes 14 corresponding to each adsorption disk 11 is the same as the number of its adsorption blocks 12, and the connecting rope 14 passes above the center line of the corresponding adsorption block 12, that is, the connecting rope 14 corresponds to the center line of the adsorption block 12, and a connecting ring 21 is provided in the middle of the top surface of the adsorption block 12 for being sleeved on the corresponding connecting rope 14, and a driving device is provided on the connecting ring 21 for driving the adsorption block 12 to slide along the corresponding connecting rope 14, for example, from the adsorption disk 11 to the movable frame 13;

[0068] The end points of the connecting ropes 14 corresponding to the same adsorption disk 11 are connected to different positions at the same horizontal height of the mobile frame 13, so that the adsorption blocks 12 of the same adsorption disk 11 can be arranged in a circle at the same height along the circumference of the adsorption tower on the mobile frame 13.

[0069] The connecting rope 14 is a steel rope with spiral patterns on the outer surface and has a certain flexibility. The driving device is fixedly connected to the corresponding connecting ring 21. A through hole is provided in the driving device. The internal thread of the inner wall of the through hole is adapted to the external thread of the steel rope. A gear can be connected to the outside of the through hole. As long as the driving gear rotates forward or reverse, the driving device can be driven to move back and forth along the steel rope.

[0070] Since the air inlet area 8, adsorption area 9 and air outlet area 10 are arranged from the outside to the inside in the adsorption tower, the inner diameter of the adsorption area 9 is smaller than that of the air inlet area 8. After the adsorption blocks 12 of a circle of adsorption rings 20 slide onto the movable rack 13, they are dispersed and will not fill a circle. The adsorption blocks 12 of the same adsorption disk 11 can be slid to different positions at the same height of the movable rack 13 through the connecting rope 14 to form a circle. Because the adsorption blocks 12 of the two adjacent adsorption rings 20 are horizontally staggered, the center lines of the adsorption blocks located in the inner and outer rings of the same adsorption disk 11 can be minimized from coinciding. However, it is possible that the center lines of the adsorption blocks of two adsorption rings separated by one or two rings may be on the same straight line. In this case, if not adjusted, the starting points of the connecting cables corresponding to the adsorption blocks of the inner ring and the connecting cables corresponding to the adsorption blocks of the outer ring will coincide on the positioning ring, which may affect the smooth sliding of the two adsorption blocks. In this case, the present invention staggers the starting points of the connecting cables corresponding to the adsorption blocks of the outer and inner rings slightly, while the end points of the connecting cables are still at different positions at the same height on the movable frame. Since the adsorption blocks of the outer ring reach saturation first and the adsorption blocks of the inner ring reach saturation later, the adsorption blocks of the outer ring slide onto the movable frame first via the connecting cables, and the adsorption blocks of the inner ring move later. The spacing between the two adjacent adsorption disks is very small, only accommodating the connecting cables corresponding to the lower adsorption disk. Therefore, the filling density of the adsorption area 9 is still very high.

[0071] The movable frame 13 is cylindrical and is arranged close to the inner wall of the adsorption tower and at a certain distance from the inner wall. The movable frame 13 includes a plurality of vertical rods 22 and a plurality of rotating rings 23. The vertical rods 22 are evenly arranged along the circumference of the inner wall of the adsorption tower to provide support for the rotating rings 23.

[0072] The rotating ring 23 is arranged on the vertical rod 22 from top to bottom, and the rotating ring 23 corresponds to the suction plate 11 one by one. The rotating ring 23 includes an outer ring 24 and an inner ring 25. The outer side of the outer ring 24 is fixedly connected to the plurality of vertical rods 22, and the inner side is provided with a guide rail. The inner ring 25 is slidably connected to the guide rail so that the inner ring 25 can rotate horizontally along the guide rail.

[0073] The end points of the plurality of connecting cables 14 are connected to corresponding positions on the inner side surface of the inner ring 25 , so that the adsorption blocks 12 of the same adsorption disk 11 are arranged in sequence along the corresponding inner ring 25 without overlapping.

[0074] The end point of each connecting cable 14 is connected to the inner ring 25 with a limiting component. When the corresponding adsorption block 12 slides to the inner ring 25, the connecting ring 21 touches the limiting component, and the limiting component clamps the connecting ring 21, thereby positioning it. Since there is a gap between the movable frame 13 and the inner wall of the adsorption tower, the connecting ring 21 is located in the middle of the adsorption block 12, and part of the adsorption block 12 is located in the space between the movable frame 13 and the inner wall, keeping the adsorption block 12 stable.

[0075] The limiting component can be an openable and closable lock. When the connecting ring 21 touches the lock, the lock is sensed and closed to lock the connecting ring 21.

[0076] The top of the movable frame 13 is connected to a lifting device, which is provided on the top of the inner wall of the adsorption tower and is used to control the vertical height of the movable frame 13 .

[0077] Since there is a distance between the mobile frame 13 and the inner wall of the adsorption tower, the rotating circle 23 of the mobile frame needs to rotate, and support is needed for the mobile frame 13, which can be in various forms. For example, the bottom of the vertical rod 22 of the mobile frame can be inserted into the bottom plate of the adsorption tower, and the upper, middle and lower three-layer clamping positions are provided in the insertion hole, so that the mobile frame 13 can be supported after moving up and down; or a plurality of grooves are provided on the inner wall of the adsorption tower, and the outer side surface of the mobile frame 13 is inserted into the groove through a plurality of support rods, and the upper, middle and lower three-layer clamping positions are provided in the groove, so that the mobile frame 13 can be supported after moving up and down; the lifting device also provides support for the mobile frame 13, and the lifting device can select conventional equipment with lifting function, such as a hydraulic device, a lever lifting device, a lifting device composed of a gear and a motor, etc.

[0078] During adsorption, the adsorption blocks 12 of the adsorption disk 11 are put together to form the adsorption disk 11. The height of the adsorption disk 11 is controlled by the corresponding connecting ropes 14. At this time, the adsorption disk 11 and the corresponding rotating circle 23 are at the same horizontal height. The raw gas from the air inlet area 8 flows radially to the adsorption area 9, and flows from the outside to the inside through the adsorption disk 11. The adsorption material in the adsorption blocks of the outermost circle is first saturated with adsorption and needs to slide outward to the mobile rack 13. The lifting device controls the overall downward movement of the mobile rack 13 by a small height, for example, 5-20 cm, so that the starting point of all the connecting ropes 14 is higher than the end point. At the same time, under the action of the driving device of the adsorption blocks of the outermost circle, the outermost adsorption blocks of all adsorption disks 11 slide along their corresponding connecting ropes 14 to the corresponding inner circle 25 of the rotating circle and are fixed in position. At the same time, the adsorption blocks of other circles do not move. The lifting mechanism controls the return of the movable frame 13 to the same height as the corresponding adsorption disc 11, with the connecting cable 14 horizontal. Adsorption continues. When the adsorption blocks in the secondary outer ring are saturated, the above operation is repeated, sliding the adsorption blocks in the secondary outer ring to the corresponding positions on the inner ring 25 and securing them. As the thickness of the adsorption disc 11 decreases, the resistance to the feed gas passing through the adsorption zone 9 also decreases, and the adsorption material is always unsaturated, resulting in high adsorption efficiency and low energy consumption. The adsorption process is completed until all adsorption blocks 12 are saturated and slide to the inner ring 25 for positioning.

[0079] At this time, the connecting cable 14 is horizontal, and the inner ring 25 rotates horizontally along the guide rail, driving the adsorption block 12 to rotate. Since the starting point of the connecting cable 14 is connected to the positioning cylinder 15, the positioning cylinder 15 also rotates at the same speed under the action of the rotating motor 18, ensuring that the connecting cable 14 does not twist or become entangled. During adsorption, the raw gas passes through the adsorption zone 9 from the outside to the inside, blowing the adsorbent material in the adsorption block 12 toward the gas outlet zone 10. When the inner ring 25 drives the adsorption block 12 to rotate, the adsorbent material in the adsorption block 12 moves outward under the action of centrifugal force, achieving the purpose of loosening and reorganizing the adsorbent material, facilitating sufficient desorption.

[0080] After the inner ring 25 and the positioning cylinder 15 stop rotating, the desorption operation can be carried out. At this time, the adsorption blocks 12 are dispersed and arranged. Compared with desorption after being combined into the adsorption disk 11, the desorbed gas does not need to flow inward and pass through the inner ring adsorption blocks, which reduces the gas flow resistance and avoids the desorbed gas from being re-adsorbed in small amounts on the adsorption material of the inner ring.

[0081] After desorption, the lifting device controls the movable frame 13 to move up a small height, for example, 5-20 cm, so that the starting point of all the connecting ropes 14 is lower than the end point. Then, the limiting components of the original innermost circle of adsorption blocks are loosened. Under the action of the driving device, the adsorption blocks of the innermost circle slide along their corresponding connecting ropes 14 to the positioning cylinder 15, and the adsorption blocks of the second inner circle slide back to the outside of the innermost circle of adsorption blocks. In this way, the adsorption blocks 12 of all adsorption circles are reset in turn and re-formed into adsorption disks 11, waiting for the next adsorption. If the adsorption oxygen production step is short, only one or several outer circles of adsorption circles may be completely adsorbed and moved to the movable frame. When the adsorption tower enters the next adsorption oxygen production step, the remaining adsorption blocks of the adsorption bed will continue to be used.

[0082] Example 2

[0083] This embodiment provides an oxygen production process of a pressure swing adsorption oxygen production system. The pressure swing adsorption oxygen production system is the same as that of Example 1. The oxygen production process is as follows: Figure 5 As shown, the following steps are included:

[0084] (1) The first adsorption system includes adsorption tower A, adsorption tower B, product gas tank 2 and vacuum pump 4, and the second adsorption system includes adsorption tower C, adsorption tower D, product gas tank 3 and vacuum pump 5. The blower is connected in parallel with adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D;

[0085] (2) The blower inputs the raw gas to the adsorption tower A, and the adsorption tower A adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 2. At the same time, the adsorption tower B completes the previous round of adsorption and two equalization pressure drops. At this time, the vacuum pump 4 evacuates the adsorption tower B for desorption;

[0086] At the same time, the last round of adsorption in adsorption tower D is completed, and the gas production outlet of adsorption tower D is only connected to the gas production outlet of adsorption tower C, releasing the excess pressure of adsorption tower D into adsorption tower C, the pressure of adsorption tower D is reduced for the first time, the pressure of adsorption tower C is increased for the first time, and adsorption tower C continues to be vacuumed for desorption; then, adsorption tower D continues to release the excess pressure into adsorption tower C, the pressure of adsorption tower D is reduced for the second time, and at the same time, vacuum pump 2 5 is switched and connected to adsorption tower D, vacuuming and desorbing adsorption tower D, and the pressure of adsorption tower C is increased for the second time;

[0087] (3) Adsorption tower A adsorbs oxygen, while adsorption tower B is vacuuming and desorbing. The gas outlet of adsorption tower A is connected in parallel to product gas tank 2 and the gas outlet of adsorption tower B, and the gas produced by adsorption tower A is used to flush the adsorption bed of adsorption tower B.

[0088] At the same time, the adsorption tower D continues to evacuate and desorb, and the gas outlet of the adsorption tower C is connected to the product gas tank 2 3, and the gas produced therein is used for final filling to prepare for the next adsorption oxygen production;

[0089] (4) After oxygen production is completed in adsorption tower A, the gas outlet of adsorption tower A is connected only to the gas outlet of adsorption tower B, and the excess pressure of adsorption tower A is released into adsorption tower B. The pressure of adsorption tower A decreases for the first time, and the pressure of adsorption tower B increases for the first time. Adsorption tower B continues to evacuate and desorb;

[0090] At the same time, the blower switches to connect to the adsorption tower C, inputs the raw gas to the adsorption tower C, the adsorption tower C adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 2 3. At the same time, the adsorption tower D completes the previous round of adsorption and two equalization pressure drops. At this time, the vacuum pump 2 5 evacuates the adsorption tower D for desorption;

[0091] (5) Adsorption tower A continues to release excess pressure into adsorption tower B, and adsorption tower A is pressure-reduced for the second time. At the same time, vacuum pump 4 is switched to be connected to adsorption tower A to evacuate and desorb adsorption tower A, and adsorption tower B is pressure-raised for the second time.

[0092] At the same time, adsorption tower C continues to adsorb oxygen, while adsorption tower D continues to vacuum and desorb;

[0093] (6) Adsorption tower A continues to evacuate and desorb, and the gas outlet of adsorption tower B is connected to product gas tank 2, and the gas produced therein is used for final filling;

[0094] At the same time, adsorption tower C continues to adsorb oxygen, while adsorption tower D is evacuated for desorption. The gas outlet of adsorption tower C is connected in parallel to the product gas tank 2 3 and the gas outlet of adsorption tower D, and the gas produced by adsorption tower C is used to flush the adsorption bed of adsorption tower D.

[0095] (7) After the oxygen production in adsorption tower C is completed, the blower inputs the raw gas to adsorption tower B, and adsorption tower B adsorbs and produces oxygen. The product oxygen is input into product gas tank 2, and at the same time, adsorption tower A continues to evacuate and desorb;

[0096] At the same time, the gas production outlet of adsorption tower C is only connected to the gas production outlet of adsorption tower D, and the excess pressure of adsorption tower C is released into adsorption tower D. The pressure of adsorption tower C drops for the first time, and the pressure of adsorption tower D rises for the first time. Adsorption tower D continues to be vacuumed and desorbed. Then, adsorption tower C continues to release the excess pressure into adsorption tower D, and the pressure of adsorption tower C drops for the second time. At the same time, vacuum pump 2 5 is switched and connected to adsorption tower C to vacuum and desorb adsorption tower C, and the pressure of adsorption tower D rises for the second time.

[0097] (8) Adsorption tower B adsorbs oxygen, and at the same time, adsorption tower A is evacuated for desorption. The gas outlet of adsorption tower B is connected in parallel to product gas tank 2 and the gas outlet of adsorption tower A, and the gas produced by adsorption tower B is used to flush the adsorption bed of adsorption tower A.

[0098] At the same time, the adsorption tower C continues to evacuate and desorb, and the gas outlet of the adsorption tower D is connected to the product gas tank 2 3, and the gas produced therein is used for final filling;

[0099] (9) After oxygen production is completed in adsorption tower B, the gas production outlet of adsorption tower B is only connected to the gas production outlet of adsorption tower A, and the excess pressure of adsorption tower B is released into adsorption tower A. The pressure of adsorption tower B is reduced for the first time, and the pressure of adsorption tower A is increased for the first time. Adsorption tower A continues to be vacuumed and desorbed; then, adsorption tower B continues to release the excess pressure into adsorption tower A, and the pressure of adsorption tower B is reduced for the second time. At the same time, vacuum pump 4 is switched and connected to adsorption tower B, and adsorption tower B is vacuumed and desorbed, and the pressure of adsorption tower A is increased for the second time.

[0100] At the same time, the blower inputs raw gas to the adsorption tower D, which adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 2 3, while the adsorption tower C continues to evacuate and desorb;

[0101] (10) Adsorption tower B continues to evacuate and desorb, and the gas outlet of adsorption tower A is connected to product gas tank 2, and the gas produced therein is used for final filling to prepare for the next adsorption oxygen production;

[0102] Adsorption tower D adsorbs oxygen, and at the same time, while adsorption tower C is evacuated for desorption, the gas output outlet of adsorption tower D is connected in parallel to product gas tank 2 3 and the gas output outlet of adsorption tower D, and the gas output part of adsorption tower D is used to flush the adsorption bed of adsorption tower C;

[0103] After step (10), the operation of step (2) is repeated, and the two adsorption systems can be operated continuously in combination.

[0104] The adsorption materials filled in the adsorption tower of this embodiment are all Li-LSX molecular sieves.

[0105] The adsorption pressure inside the adsorption tower is 53.8 kPa; the desorption pressure of the adsorption tower is -47.1 kPa, both of which are gauge pressures.

[0106] Attachment Figure 6 In the figure, A is adsorption, ED1 is the first equalizing pressure drop, ED2+V is the second equalizing pressure drop and vacuum desorption at the same time, V is vacuum desorption, O2P+V is the flushing of the bed with produced gas and vacuum desorption at the same time, ER1+V is the first equalizing pressure increase and vacuum desorption at the same time, ER2 is the second equalizing pressure increase, and FR is final charging.

[0107] Comparative Example 1

[0108] This comparative example provides an oxygen production process of a pressure swing adsorption oxygen production system. The pressure swing adsorption oxygen production system is the same as that of Example 1, except that Figure 7 As shown, it also includes a buffer tank 1 and a buffer tank 2. Each adsorption tower is connected in parallel with the buffer tank 1 and the buffer tank 2. The oxygen production process includes the following steps:

[0109] (1) Same as Example 2;

[0110] (2) The blower inputs the raw gas to the adsorption tower A, the adsorption tower A adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 1;

[0111] At the same time, adsorption tower B completes the previous round of adsorption. At this time, vacuum pump 1 evacuates adsorption tower B for desorption. At the same time, buffer tank 2 is connected to the gas outlet of adsorption tower B, and the gas in buffer tank 2 is used to flush the adsorption bed of adsorption tower B. Then, adsorption tower B stops evacuating, buffer tank 1 is connected to the gas outlet of adsorption tower B, and the gas in buffer tank 1 is used to increase the pressure of adsorption tower B, which is the first equalization pressure increase. Then, the gas in buffer tank 1 or buffer tank 2 is used to finally charge adsorption tower B (the final charge to reach the pressure required for the next adsorption).

[0112] At the same time, after the adsorption tower C completes the second equalization pressure drop of the previous round, the vacuum pump 2 evacuates the adsorption tower C for desorption; then, while evacuating and desorbing, the buffer tank 2 is connected to the gas outlet of the adsorption tower C to flush the bed layer of the adsorption tower C;

[0113] At the same time, adsorption tower D has completed the previous round of adsorption. At this time, the gas production outlet of adsorption tower D is connected to buffer tank 1, and the excess pressure of adsorption tower D is released into buffer tank 1, that is, adsorption tower D undergoes the first pressure drop. Then, buffer tank 2 is connected to the gas production outlet of adsorption tower D, and the excess pressure of adsorption tower D is released into buffer tank 2. Adsorption tower D undergoes the second pressure drop. At the same time, vacuum pump 2 vacuums and desorbs adsorption tower D. Then, adsorption tower D is disconnected from buffer tank 2 and only vacuums and desorbs.

[0114] (3) After the oxygen production of adsorption tower A is completed, buffer tank 1 is connected to the gas production outlet of adsorption tower A, and the excess pressure of adsorption tower A is released into buffer tank 1, and adsorption tower A is subjected to the first pressure drop; then, buffer tank 2 is connected to the gas production outlet of adsorption tower A, and the excess pressure of adsorption tower A is released into buffer tank 2, and adsorption tower A is subjected to the second pressure drop, and at the same time, vacuum pump 1 is used to evacuate and desorb adsorption tower A; then, adsorption tower A is disconnected from buffer tank 2, and only evacuates and desorbs;

[0115] At the same time, the blower inputs raw gas to adsorption tower B, which produces oxygen through adsorption, and the product oxygen is successively input into buffer tank 1 and buffer tank 2;

[0116] At the same time, the adsorption tower C continues to flush the bed layer. Then, the adsorption tower C stops evacuating. The buffer tank 1 is connected to the gas outlet of the adsorption tower C. The gas in the buffer tank 1 is used to increase the pressure of the adsorption tower C, which is the first equalization pressure increase. Then, the gas in the buffer tank 1 or the buffer tank 2 is used to finally charge the adsorption tower C.

[0117] At the same time, the adsorption tower D continues to be evacuated and desorbed. Then, the vacuum pump 2 evacuates and desorbs the adsorption tower D. At the same time, the buffer tank 2 is connected to the gas outlet of the adsorption tower D, and the gas in the buffer tank 2 is used to flush the adsorption bed of the adsorption tower D.

[0118] (4) After oxygen production is completed in adsorption tower B, buffer tank 1 is connected to the gas production outlet of adsorption tower B, and the excess pressure of adsorption tower B is released into buffer tank 1, and adsorption tower B is subjected to the first pressure drop; then, buffer tank 2 is connected to the gas production outlet of adsorption tower B, and the excess pressure of adsorption tower B is released into buffer tank 2, and adsorption tower B is subjected to the second pressure drop, while vacuum pump 1 is used to evacuate and desorb adsorption tower B; then, adsorption tower B is disconnected from buffer tank 2 and only evacuates and desorbs adsorption;

[0119] At the same time, the adsorption tower A continues to be vacuumed and desorbed. Then, while continuing to vacuum and desorb, the buffer tank 2 is connected to the gas outlet of the adsorption tower A, and the gas in the buffer tank 2 is used to flush the adsorption bed of the adsorption tower A;

[0120] At the same time, the blower inputs raw gas to the adsorption tower C, which produces oxygen through adsorption, and the product oxygen is successively input into the buffer tank 1 and the buffer tank 2;

[0121] At the same time, adsorption tower D continues to flush the bed layer; then, adsorption tower D stops evacuating, buffer tank 1 is connected to the gas outlet of adsorption tower D, and the gas in buffer tank 1 is used to increase the pressure of adsorption tower D, which is the first equalization pressure increase; then, the gas in buffer tank 1 or buffer tank 2 is used to finally charge adsorption tower D;

[0122] (5) At the same time, the blower inputs the raw gas to the adsorption tower D, and the adsorption tower D adsorbs and produces oxygen, and the product oxygen is successively input into the buffer tank 1 and the buffer tank 2;

[0123] At the same time, after the adsorption tower C completes oxygen production, the buffer tank 1 is connected to the gas production outlet of the adsorption tower C to release the excess pressure of the adsorption tower C into the buffer tank 1, and the adsorption tower C undergoes a first pressure drop; then, the buffer tank 2 is connected to the gas production outlet of the adsorption tower C to release the excess pressure of the adsorption tower C into the buffer tank 2, and the adsorption tower C undergoes a second pressure drop, while the vacuum pump 2 vacuums and desorbs the adsorption tower C; then, the adsorption tower C is disconnected from the buffer tank 2 and only vacuums and desorbs;

[0124] At the same time, adsorption tower B continues to evacuate and desorb; then, adsorption tower D flushes the bed;

[0125] At the same time, adsorption tower A continues to flush the bed; then, adsorption tower A stops evacuating, buffer tank one is connected to the gas outlet of adsorption tower A, and the gas in buffer tank one is used to increase the pressure of adsorption tower A, which is the first equalization pressure increase; then, the gas in buffer tank one or buffer tank two is used to finally charge adsorption tower A, preparing for the next adsorption oxygen production.

[0126] Attachment Figure 8In the figure, A is adsorption, ED1 is the first equalizing pressure drop, ED2+V is the second equalizing pressure drop and vacuum desorption at the same time, V is vacuum desorption, ED2P+V is the flushing of the bed layer with produced gas and vacuum desorption at the same time, ER1 is the first equalizing pressure rise, and FR is the final charge.

[0127] By the attached Figure 6 and Figure 8 It can be seen that the blower is in use at every moment, avoiding ineffective discharge of the blower and making 100% use of the blower and vacuum pump.

[0128] The power consumption of Example 2 and Comparative Example 1 is 0.298 kWh / Nm 3 and 0.308kWh / Nm 3 The power consumption of comparative example 1 is higher than that of embodiment 2 because the average pressure of the fan during air intake is higher.

[0129] Comparative Example 2

[0130] This comparative example provides an oxygen production process of a pressure swing adsorption oxygen production system, which is the same as Example 2. The pressure swing adsorption oxygen production system is the same as Example 1, except that the adsorption material is regularly packed in the adsorption area of ​​the adsorption tower, which is an integral circular ring and cannot be moved. No adsorption plate, movable frame, connecting rope and positioning cylinder are provided.

[0131] The power consumption of Example 2 and Comparative Example 2 is 0.298 kWh / Nm 3 and 0.347kWh / Nm 3 ,It can be seen that the energy consumption of the traditional radial adsorption tower is relatively high.

Claims

1. A pressure swing adsorption oxygen production system, characterized in that: An adsorption tower comprising at least 2n adsorption systems and n blowers, wherein the blowers are connected in parallel with the adsorption systems, and n is a natural number not less than 1; The adsorption system includes a product gas tank, a vacuum pump and two adsorption towers. The product gas tank is connected in parallel to the gas outlet of the adsorption tower. A blower is connected in parallel to the bottom opening of the adsorption tower for inputting raw gas. The vacuum pump is also connected in parallel to the bottom opening of the adsorption tower for exhausting when the adsorption tower is depressurized. The interior of the adsorption tower includes an air inlet area, an adsorption area, and an air outlet area from the outside to the inside. The bottom of the air inlet area is connected to the bottom opening of the adsorption tower. A plurality of adsorption disks are arranged from top to bottom in the adsorption area. The adsorption disks include a plurality of adsorption blocks. The adsorption disks are connected to a movable rack near the inner wall of the adsorption tower by a connecting cable. The adsorption blocks can move between the adsorption disks and the movable rack via the connecting cable. The adsorption tower is cylindrical, and the adsorption zone and the air inlet zone are both circular and surround the outside of the air outlet zone in sequence; a cylindrical positioning cylinder is provided between the adsorption zone and the air outlet zone to define the position of the adsorption block in the innermost circle of the adsorption disk; A lower baffle is provided at the bottom of the adsorption tower. The lower baffle is circular and located above the bottom opening to block the raw gas input from the bottom opening. The adsorption plate includes several adsorption circles from the outside to the inside. All adsorption circles are concentrically arranged. The adsorption circle is composed of several adsorption blocks spliced ​​horizontally from left to right. The inner side of the innermost adsorption ring of the adsorption disk is in close contact with the outer side of the positioning cylinder; a plurality of connecting cables are connected above each adsorption disk of the positioning cylinder, and the connecting cables pass above the center line of the corresponding adsorption block. A connecting ring is provided in the middle of the top surface of the adsorption block for being sleeved on the corresponding connecting cable, and a driving device is provided on the connecting ring for driving the adsorption block to slide along the corresponding connecting cable; The mobile frame includes several vertical rods and several rotating rings. The vertical rods are evenly arranged along the circumference of the inner wall of the adsorption tower to provide support for the rotating rings. The rotating ring is arranged on the vertical rod from top to bottom, and the rotating ring corresponds to the adsorption plate one by one; the rotating ring includes an outer ring and an inner ring. The outer side of the outer ring is fixedly connected to a plurality of vertical rods, and the inner side is provided with a guide rail. The inner ring is slidably connected to the guide rail so that the inner ring can rotate horizontally along the guide rail. The end points of several connecting cables are connected to corresponding positions on the inner side of the inner circle, so that the adsorption blocks of the same adsorption disk are arranged in sequence along the corresponding inner circle without overlapping; The top of the movable frame is connected to a lifting device, which is arranged on the top of the inner wall of the adsorption tower and is used to control the vertical height of the movable frame.

2. The pressure swing adsorption oxygen production system according to claim 1, characterized in that: A gas outlet is provided at the top of the adsorption tower, and the gas outlets of the two adsorption towers of the same adsorption system are also connected to each other. The bottom opening of the adsorption tower of the adsorption system is connected to the outlet pipe, and the outlet pipe is connected to the inlet of the three-way valve. The vacuum pump is connected to the first outlet of the three-way valve of the two adsorption towers in parallel through the pipe, and the blower is connected to the second outlet of the three-way valve of the two adsorption towers in parallel through the pipe.

3. The pressure swing adsorption oxygen production system according to claim 1, characterized in that: The diameter of the lower partition is not less than the outer diameter of the adsorption disk.

4. The pressure swing adsorption oxygen production system according to claim 3, characterized in that: The positioning cylinder is a frame structure consisting of a number of vertical rods and horizontal circles to form a network; A rotating motor is provided above or below the adsorption tower. The rotating shaft connected to the rotating motor penetrates into the adsorption tower and is connected to the inner wall of the top or bottom of the positioning cylinder through several connecting rods, which can drive the positioning cylinder to rotate.

5. The pressure swing adsorption oxygen production system according to claim 4, characterized in that: The adsorption disk is annular, and the adsorption rings are layered around the adsorption disk, and the diameter of the adsorption rings gradually decreases from the outside to the inside; The adsorption block is fan-shaped and hollow inside, which is used to fill the adsorption material. The adsorption block is a mesh cage type with mesh holes evenly distributed on the surface to facilitate the entry of raw gas into the adsorption block.

6. The pressure swing adsorption oxygen production system according to claim 5, characterized in that: The number of connecting cables corresponding to an adsorption disk is the same as the number of its adsorption blocks. The end points of the connecting rope corresponding to the same adsorption disk are connected to different positions at the same horizontal height of the mobile rack, so that the adsorption blocks of the same adsorption disk can be arranged in a circle at the same height along the circumference of the adsorption tower on the mobile rack.

7. The pressure swing adsorption oxygen production system according to claim 6, characterized in that: The movable frame is cylindrical and is arranged close to the inner wall of the adsorption tower and has a certain distance from the inner wall.

8. The oxygen production process of the pressure swing adsorption oxygen production system according to claim 2, characterized in that: The following steps are involved: (1) The first adsorption system includes adsorption tower A, adsorption tower B, product gas tank 1 and vacuum pump 1; the second adsorption system includes adsorption tower C, adsorption tower D, product gas tank 2 and vacuum pump 2; the blower is connected in parallel with adsorption tower A, adsorption tower B, adsorption tower C and adsorption tower D; (2) The blower inputs the raw gas to the adsorption tower A, and the adsorption tower A adsorbs and produces oxygen. The product oxygen is input into the product gas tank 1. At the same time, the adsorption tower B completes the previous round of adsorption and two equalization pressure drops. At this time, the vacuum pump 1 vacuums and desorbs the adsorption tower B; At the same time, the previous round of adsorption in adsorption tower D is completed, and the gas production outlet of adsorption tower D is only connected to the gas production outlet of adsorption tower C, releasing the excess pressure of adsorption tower D into adsorption tower C, the pressure of adsorption tower D drops for the first time, the pressure of adsorption tower C rises for the first time, and adsorption tower C continues to be vacuumed for desorption; then, adsorption tower D continues to release the excess pressure into adsorption tower C, the pressure of adsorption tower D drops for the second time, and at the same time, vacuum pump 2 is switched and connected to adsorption tower D, vacuuming and desorbing adsorption tower D, and the pressure of adsorption tower C rises for the second time; (3) Adsorption tower A absorbs oxygen, and at the same time, adsorption tower B is vacuuming and desorbing. The gas outlet of adsorption tower A is connected in parallel to product gas tank 1 and the gas outlet of adsorption tower B, and the gas produced by adsorption tower A is used to flush the adsorption bed of adsorption tower B; At the same time, the adsorption tower D continues to evacuate and desorb, and the gas outlet of the adsorption tower C is connected to the product gas tank 2, which is used for final filling with the gas produced therein to prepare for the next adsorption oxygen production; (4) After oxygen production is completed in adsorption tower A, the gas outlet of adsorption tower A is only connected to the gas outlet of adsorption tower B, and the excess pressure of adsorption tower A is released into adsorption tower B. The pressure of adsorption tower A drops for the first time, and the pressure of adsorption tower B rises for the first time. Adsorption tower B continues to evacuate and desorb; At the same time, the blower switches to connect to adsorption tower C, inputs raw gas to adsorption tower C, adsorption tower C adsorbs and produces oxygen, and the product oxygen is input into product gas tank 2. At the same time, adsorption tower D completes the previous round of adsorption and two equalization pressure drops. At this time, vacuum pump 2 evacuates and desorbs adsorption tower D; (5) Adsorption tower A continues to release excess pressure into adsorption tower B, and the pressure of adsorption tower A drops for the second time. At the same time, the vacuum pump is switched to adsorption tower A to evacuate and desorb adsorption tower A, and the pressure of adsorption tower B rises for the second time. At the same time, adsorption tower C continues to adsorb oxygen, while adsorption tower D continues to vacuum and desorb; (6) Adsorption tower A continues to evacuate and desorb, and the gas outlet of adsorption tower B is connected to product gas tank 1, and the gas produced therein is used for final filling; At the same time, adsorption tower C continues to adsorb oxygen, while adsorption tower D is evacuated for desorption. The gas output of adsorption tower C is connected in parallel to product gas tank 2 and the gas output of adsorption tower D, and the gas output of adsorption tower C is used to flush the adsorption bed of adsorption tower D. (7) After the oxygen production in adsorption tower C is completed, the blower inputs the raw gas to adsorption tower B, and adsorption tower B adsorbs and produces oxygen. The product oxygen is input into product gas tank 1, while adsorption tower A continues to evacuate and desorb; At the same time, the gas production outlet of adsorption tower C is only connected to the gas production outlet of adsorption tower D, and the excess pressure of adsorption tower C is released into adsorption tower D. The pressure of adsorption tower C drops for the first time, and the pressure of adsorption tower D rises for the first time. Adsorption tower D continues to be vacuumed and desorbed. Then, adsorption tower C continues to release the excess pressure into adsorption tower D. The pressure of adsorption tower C drops for the second time. At the same time, vacuum pump 2 is switched and connected to adsorption tower C to vacuum and desorb adsorption tower C, and the pressure of adsorption tower D rises for the second time. (8) Adsorption tower B adsorbs oxygen. At the same time, while adsorption tower A is vacuuming and desorbing, the gas outlet of adsorption tower B is connected in parallel to product gas tank 1 and the gas outlet of adsorption tower A. The gas produced by adsorption tower B is used to flush the adsorption bed of adsorption tower A. At the same time, the adsorption tower C continues to evacuate and desorb, and the gas outlet of the adsorption tower D is connected to the product gas tank 2, and the gas produced therein is used for final filling; (9) After the oxygen production of adsorption tower B is completed, the gas production outlet of adsorption tower B is only connected to the gas production outlet of adsorption tower A, and the excess pressure of adsorption tower B is released into adsorption tower A. The pressure of adsorption tower B drops for the first time, and the pressure of adsorption tower A rises for the first time. Adsorption tower A continues to be vacuumed and desorbed; then, adsorption tower B continues to release the excess pressure into adsorption tower A, and the pressure of adsorption tower B drops for the second time. At the same time, the vacuum pump is switched to be connected to adsorption tower B, and the pressure of adsorption tower B is vacuumed and desorbed, and the pressure of adsorption tower A rises for the second time. At the same time, the blower inputs raw gas to the adsorption tower D, which adsorbs and produces oxygen, and the product oxygen is input into the product gas tank 2. At the same time, the adsorption tower C continues to vacuum and desorb; (10) Adsorption tower B continues to evacuate and desorb, and the gas outlet of adsorption tower A is connected to product gas tank 1, and the gas produced therein is used for final filling to prepare for the next adsorption oxygen production; Adsorption tower D absorbs and produces oxygen. At the same time, while adsorption tower C is evacuated and desorbed, the gas output outlet of adsorption tower D is connected in parallel to product gas tank 2 and the gas output outlet of adsorption tower D. The gas output of adsorption tower D is used to flush the adsorption bed of adsorption tower C. After step (10), the operation of step (2) is repeated, and the two adsorption systems can be operated continuously in combination.

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