An intelligent compression system for molecular sieves used in energy-saving pressure swing adsorption oxygen production equipment

Abstract

The present invention discloses an intelligent compression system for molecular sieves for energy-saving pressure swing adsorption oxygen production equipment, which relates to the technical field of molecular sieves and comprises: an adsorber having a cylinder body, the top of which is detachably connected to a top cover; an inner hole cylinder, a middle hole cylinder and an outer hole cylinder sequentially distributed in the cylinder body, wherein an oxygen-generating adsorbent is arranged between the inner hole cylinder and the middle hole cylinder, and a dehydration adsorbent is arranged between the middle hole cylinder and the outer hole cylinder; a compression membrane, which is detachably fixed to the adsorber, and the compression membrane is located above the inner hole cylinder, the middle hole cylinder and the outer hole cylinder, and a first space is formed between the top of the compression membrane and the adsorber; and an air supply system, which is used to supply air to the first space so as to compress the compression membrane with a first air pressure, and to compress the oxygen-generating adsorbent and the dehydration adsorbent through the compression membrane.

Description

Technical Field

[0001] The invention relates to the technical field of molecular sieves, in particular to an intelligent molecular sieve compacting system for energy-saving pressure swing adsorption oxygen production equipment. Background Art

[0002] As more and more process gas processes use molecular sieves and other fillers to selectively adsorb certain components in the raw gas to obtain the required product gas, there are more and more various compression methods for protecting molecular sieve fillers, such as spring pressure drop, gravity compression, mechanical compression, etc. Each has its own characteristics. For low-pressure process such as VPSA pressure swing adsorption oxygen production, there is mechanical compression, which is relatively cumbersome and cannot ensure that every point is in a compressed state. It is also necessary to manually tighten the compression screw every once in a while, which is laborious and the screw is prone to deformation and failure; there is also spring compression, which will permanently deform and lose elasticity after a period of use, and the compression effect will be weakened; there are also materials with relatively large bulk density such as porcelain balls and steel balls, which use their own weight to compress the molecular sieve, which is easy to form an arch phenomenon, causing the partition to tilt or deform, etc.

[0003] The compression system is very important. It not only maintains process stability, but also ensures the life of the molecular sieve packing. It is a key device for the long-term stable operation of the equipment.

[0004] Therefore, it is necessary to provide an energy-saving pressure swing adsorption oxygen production equipment with a molecular sieve intelligent compression system to solve the above problems. Summary of the invention

[0005] To achieve the above object, the present invention provides the following technical solution: an energy-saving pressure swing adsorption oxygen production equipment molecular sieve intelligent compression system, comprising:

[0006] An adsorber having a cylinder, the top of which is detachably connected to a top cover;

[0007] An inner hole cylinder, a middle hole cylinder, and an outer hole cylinder are sequentially distributed in the cylinder body, wherein an oxygen-generating adsorbent is arranged between the inner hole cylinder and the middle hole cylinder, and a dehydration adsorbent is arranged between the middle hole cylinder and the outer hole cylinder;

[0008] A compression film is detachably fixed on the adsorber, and the compression film is located above the inner hole cylinder, the middle hole cylinder, and the outer hole cylinder, and a first space is formed between the top of the compression film and the adsorber; and

[0009] The air supply system is used to supply air to the first space so as to compress the compression membrane with a first air pressure and compress the oxygen generating adsorbent and the dehydration adsorbent through the compression membrane.

[0010] Further, preferably, the compression film is a disc-shaped structure, and radially outward therefrom are successively a first film body, a second film body, and a third film body, wherein the third film body is detachably fixed on the adsorber, and there is a first height difference between the third film body and the first film body.

[0011] Further, preferably, a ring plate is fixed on the side wall of the adsorber for carrying the third membrane body, and a plurality of bolts are also arranged on the side wall of the adsorber and are spaced apart along the circumference of the adsorber, the height of the bolts is adjustable, and a clamping ring is commonly connected to the bottom of the plurality of bolts, and the third membrane body can be clamped onto the ring plate by the clamping ring;

[0012] The thickness of the third film body is greater than that of the first film body and the second film body.

[0013] Further, preferably, a liquid pre-compression component is placed on the upper surface of the compression film.

[0014] Further, preferably, the liquid pre-compression assembly comprises:

[0015] Support ring;

[0016] A ferrule, wherein the ferrule is sleeved on the outside of the bolt and the ferrule is fixed on the support ring, and the bolt is arranged on the side wall of the adsorber; and

[0017] The sealing film is fixed on the inner side of the support ring, and liquid is preset inside the sealing film. In a natural state, there is a second height difference between the lower surface of the support ring and the lower surface of the sealing film, and the second height difference is smaller than the first height difference.

[0018] Further, preferably, in a natural state, the weight of the liquid pre-compression component acts on the compression membrane.

[0019] Furthermore, preferably, an annular gap is left between the outer porous tube and the cylinder body to allow oxygen to enter the annular gap and be discharged. The upper surface of the outer porous tube is higher than the first membrane body, and the side of the support ring close to the second membrane body is inclined and gradually inclined toward the outside of the support ring from bottom to top so as to press the second membrane body tightly in the outer porous tube.

[0020] Further, preferably, a support plate is fixed to the inner surface of the sealing membrane, and the diameter of the support plate is larger than the diameter of the inner bore cylinder.

[0021] Further, as a preference, the air supply system includes a first pipeline for supplying air to the first space, a pressure reducing valve and an automatic air supply valve are connected in series on the first pipeline, another pressure reducing valve is connected in parallel on one side of the pressure reducing valve, and a bypass valve is connected in parallel on one side of the automatic air supply valve, and a safety valve and an air pressure sensor are also provided on the first pipeline, and when the air pressure sensor detects that the air pressure is lower than a first threshold value, the automatic air supply valve replenishes air.

[0022] Compared with the prior art, the present invention provides an energy-saving molecular sieve intelligent compression system for pressure swing adsorption oxygen production equipment, which has the following beneficial effects:

[0023] 1. Simple construction and low material costs;

[0024] 2. Regardless of whether the molecular sieve is unevenly filled or settles naturally or partially in the later stage, the gas flow can fill it immediately to ensure that the compression at each point is stable;

[0025] 3. The pressure in the independent chamber is constant, which can ensure that the molecular sieve and other fillers at each point are subjected to the same pressure, so as to avoid local crushing and extend the life of the molecular sieve (expensive);

[0026] 4. The gas supply system automatically detects, replenishes and compresses air, and does not require manual operation or intervention, which is safe and reliable.

[0027] 5. Reduce the ineffective volume in the adsorber, reduce the operating load of power equipment, and save energy and reduce consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of a molecular sieve intelligent compression system for energy-saving pressure swing adsorption oxygen production equipment;

[0029] Figure 2 A schematic diagram of the structure of the adsorber in the molecular sieve intelligent compression system for an energy-saving pressure swing adsorption oxygen production equipment Figure 1 ;

[0030] Figure 3 A schematic diagram of the structure of the adsorber in the molecular sieve intelligent compression system for an energy-saving pressure swing adsorption oxygen production equipment Figure 2 ;

[0031] Figure 4 for Figure 2 A schematic diagram of the enlarged structure at point A;

[0032] Figure 5 for Figure 3 A schematic diagram of the enlarged structure at B;

[0033] In the figure: 1. pressure reducing valve; 2. automatic air supply valve; 3. bypass valve; 4. safety valve; 5. air pressure sensor; 6. adsorber; 61. cylinder; 62. top cover; 63. oxygen generating adsorbent; 64. dehydration adsorbent; 65. outer hole cylinder; 7. compression membrane; 71. first membrane body; 72. second membrane body; 73. third membrane body; 8. liquid pre-pressure assembly; 81. support plate; 82. support ring; 83. sealing membrane; 84. ferrule; 9. ring plate; 10. compression ring; 11. bolt. DETAILED DESCRIPTION

[0034] The terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned description of the drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequential order. It should be understood that the terms used in this way can be interchangeable under appropriate circumstances, which is merely a way of distinguishing the objects of the same attributes when describing them in the embodiments of the present application. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, so that the process, method, system, product or equipment comprising a series of units need not be limited to those units, but may include other units that are not clearly listed or inherent to these processes, methods, products or equipment.

[0035] Example: Please refer to Figure 1-5 In an embodiment of the present invention, a molecular sieve intelligent compacting system for an energy-saving pressure swing adsorption oxygen production equipment is provided, comprising:

[0036] The adsorber 6 comprises a cylinder 61, and a top cover 62 is detachably connected to the top of the cylinder 61;

[0037] An inner hole cylinder, a middle hole cylinder, and an outer hole cylinder 65 are sequentially distributed in the cylinder body 61, wherein an oxygen generating adsorbent 63 is arranged between the inner hole cylinder and the middle hole cylinder, and a dehydrating adsorbent 64 is arranged between the middle hole cylinder and the outer hole cylinder 65;

[0038] A compression film 7 is detachably fixed on the adsorber 6, and the compression film 7 is located above the inner hole cylinder, the middle hole cylinder, and the outer hole cylinder 65, and a first space is formed between the top of the compression film 7 and the adsorber 6; and

[0039] The air supply system is used to supply air to the first space so as to compress the compression membrane 7 with a first air pressure, and compress the oxygen generating adsorbent 63 and the dehydrating adsorbent 64 through the compression membrane 7 .

[0040] Among them, the inner pore tube, the middle pore tube, and the oxygen-generating adsorbent 63 constitute a first molecular sieve for adsorbing nitrogen molecules, etc., and the middle pore tube, the outer pore tube 65, and the dehydrating adsorbent 64 constitute a second molecular sieve for adsorbing water molecules;

[0041] During implementation, the gas supply system is started to prepare to supply gas to the first space (between the top of the compression membrane 7 and the adsorber 6). The gas supply system needs to be able to accurately control the gas pressure to achieve uniform compression of the molecular sieve layer.

[0042] The air supply system supplies air to the first space, so that the compression film presses the molecular sieve downward. The size of the compression force can be controlled by adjusting the air supply system to meet different process requirements. Whether the molecular sieve is unevenly filled or naturally settles as a whole or partially in the later stage, the gas flow can fill it immediately to ensure that the compression at each point is stable.

[0043] The working process is as follows: the raw gas enters the adsorber 6 and flows through the molecular sieve. The oxygen-generating adsorbent selectively adsorbs nitrogen and other gases to separate oxygen, and the dehydrating adsorbent removes moisture from the gas flow to ensure the dryness of the oxygen.

[0044] During the adsorption process, the gas supply system monitors the state and compression force of the molecular sieve in real time, and adjusts the pressure and flow as needed to maintain the optimal compression state and gas processing efficiency.

[0045] In this embodiment, unnecessary energy consumption is reduced by precisely controlling the pressing force. This energy-saving feature is particularly important in the low-pressure VPSA process.

[0046] Compared with traditional mechanical compaction methods, the intelligent compaction system reduces the wear and replacement frequency of mechanical parts, reduces maintenance costs and downtime, and uniform and proper compaction helps reduce the wear and breakage of the molecular sieve, extends its service life, and reduces long-term operating costs.

[0047] In this embodiment, the compression film 7 is a disc-shaped structure, and radially outward therefrom are the first film body 71, the second film body 72, and the third film body 73, wherein the third film body 73 is detachably fixed on the adsorber 6, and there is a first height difference between the third film body 73 and the first film body 71.

[0048] In this embodiment, the first height difference between the first film body 71 and the third film body 73 is to provide a certain elastic space when compressed, allowing the molecular sieve to expand and contract during the adsorption process, thereby reducing stress damage caused by the volume change of the molecular sieve.

[0049] In addition, a ring plate 9 is fixed on the side wall of the adsorber 6 for carrying the third membrane body 73. A plurality of bolts 11 are also provided on the side wall of the adsorber 6 and are distributed at intervals along the circumference of the adsorber 6. The height of the bolts 11 is adjustable. The bottoms of the plurality of bolts 11 are commonly connected with a clamping ring 10, and the third membrane body 73 can be clamped onto the ring plate 9 through the clamping ring 10.

[0050] The thickness of the third film body 73 is greater than the thickness of the first film body 71 and the second film body 72 .

[0051] In this embodiment, the height of the bolt 11 is adjustable, so that during installation or maintenance, the third membrane body 73 can be loosened or compressed by lifting or lowering the bolt. This design allows for convenient fixing and replacement of the compression membrane.

[0052] In specific implementation, when the bolt 11 is lowered and fixed at an appropriate height, the clamping ring 10 will press the third membrane 73 tightly to ensure that it is fixed on the ring plate 9, so as to cooperate with other components to form a sealed and stable clamping system.

[0053] When the compression membrane needs to be replaced or the molecular sieve layer needs to be maintained, the height of the bolt 11 can be raised to release the compression of the third membrane body 73, so that the compression membrane can be conveniently removed or replaced.

[0054] More specifically, in this embodiment, a first nut is fixed on the side wall of the adsorber 6 , and a bolt 11 is threadedly connected to the first nut. The height of the bolt 11 can be adjusted by rotating the bolt.

[0055] Furthermore, a liquid pre-compression component 8 is placed on the upper surface of the compression film 7 .

[0056] In this embodiment, the liquid pre-pressing assembly 8 is placed on the upper surface of the compression membrane 7, and the first pre-pressing pressure is applied to the compression membrane by the dead weight of the liquid. Such liquid pre-pressing helps to uniformly pre-press the molecular sieve layer in the initial stage.

[0057] On the basis of liquid pre-compression, gas pressure is subsequently applied to the compression membrane through the air supply system to supplement and adjust the compression force to achieve the desired compression state.

[0058] Since the liquid is fluid, it can be evenly distributed on the compression membrane to fill possible gaps and ensure that the pressure on the molecular sieve layer is uniform. Therefore, the liquid pre-compression component 8 provides a highly adaptable pre-tightening force that can be adjusted according to the molecular sieve filling situation and process requirements.

[0059] It is worth mentioning that in this embodiment, liquid pre-compression can reduce dependence on gas, thereby reducing gas consumption and improving energy efficiency, and the liquid pre-compression component provides a stable pre-tightening force, which helps to maintain the stability of the molecular sieve layer and the long-term operation of the equipment.

[0060] Of course, in actual applications, it may be necessary to optimize the pressure ratio of liquid and gas, as well as the design of the liquid pre-pressing components through experiments and tests to ensure the best compression effect and system performance.

[0061] In this embodiment, the liquid pre-compression component 8 includes:

[0062] Support ring 82;

[0063] a plurality of ferrules 84 corresponding to the bolts 11 , the ferrules 84 being sleeved on the outside of the bolts 11 and fixed on the support ring 82 ; and

[0064] The sealing film 83 is fixed to the inner side of the support ring 82, and liquid is preset inside the sealing film 83. In a natural state, there is a second height difference between the lower surface of the support ring 82 and the lower surface of the sealing film 83, and the second height difference is smaller than the first height difference.

[0065] In this embodiment, the clamping sleeve 84 is used to be sleeved on the outside of each bolt 11, so as to limit the position of the liquid pre-compression assembly so that it will not rotate, ensuring the stability of the entire structure, and the sealing film 83 is fixed on the inner side of the support ring 82, and liquid is preset inside. The function of the sealing film is to maintain the integrity of the liquid and control the distribution of the liquid, while preventing liquid leakage.

[0066] In this embodiment, there is a second height difference between the lower surface of the support ring 82 and the lower surface of the sealing film 83, and this height difference is smaller than the first height difference (the height difference between the first film body 71 and the third film body 73). This design is to ensure that the liquid can be evenly distributed on the compression film when the pre-tightening pressure is applied, and at the same time, there is enough space for the gas to supplement the pressure.

[0067] In this embodiment, the liquid is evenly distributed on the compression membrane through the sealing membrane 83, providing uniform pre-tightening pressure, which helps to improve the adsorption efficiency of the molecular sieve. Through the fixation of the ferrule 84 and the support ring 82, the liquid pre-tightening assembly, the bolts and the compression membrane form a stable structure, which helps to maintain long-term operational stability.

[0068] In addition, in a natural state, the weight of the liquid pre-compression component 8 acts on the compression membrane 7 .

[0069] In this embodiment, the weight of the liquid pre-pressing component 8 acts on the pressing film 7, thereby providing pre-pressing pressure for the pressing film 7. Liquid is pre-set in the liquid pre-pressing component 8, and the weight of the liquid can be calculated according to the density and volume of the liquid, which makes the measurement of the pre-pressing pressure relatively simple. The pre-pressing pressure can be easily changed by adjusting the volume of the liquid or replacing liquids of different densities.

[0070] In this embodiment, an annular gap is left between the outer hole tube 65 and the cylinder body 61 to allow oxygen to enter the annular gap and be discharged. The upper surface of the outer hole tube 65 is higher than the first membrane body 71. The side of the support ring 82 close to the second membrane body 72 is inclined and gradually inclines toward the outside of the support ring 82 from bottom to top so as to press the second membrane body 72 into the outer hole tube 65.

[0071] In this embodiment, the side of the support ring 82 close to the second membrane body 72 is designed to be inclined, and gradually inclines toward the outside of the support ring from bottom to top. This design helps to evenly press the second membrane body 72 into the outer hole tube 65, and the clamping ring 10 can press the third membrane body 73 onto the ring plate 9, thereby achieving double compression and high stability.

[0072] A support plate 81 is fixed to the inner surface of the sealing film 83 , and the diameter of the support plate 81 is larger than the diameter of the inner bore tube.

[0073] In this embodiment, the diameter of the support plate 81 is larger than the diameter of the inner hole tube, which enables the support plate 81 to cover the entire cross-section of the inner hole tube, provide uniform support for the sealing film 83, and ensure that the liquid can be evenly distributed on the compression film; the presence of the support plate 81 enhances the structural stability of the entire liquid pre-compression assembly, helps to maintain the shape and position of the assembly during the compression process, and the support plate 81 helps to optimize the distribution of the liquid and reduce the problem of uneven compression caused by uneven liquid distribution.

[0074] In this embodiment, the air supply system includes a first pipeline that supplies air to the first space, and a pressure reducing valve 1 and an automatic air supply valve 2 are connected in series on the first pipeline. Another pressure reducing valve is connected in parallel to one side of the pressure reducing valve 1, and a bypass valve 3 is connected in parallel to one side of the automatic air supply valve 2. A safety valve 4 and an air pressure sensor 5 are also provided on the first pipeline. When the air pressure sensor 5 detects that the air pressure is lower than the first threshold value, the automatic air supply valve 2 supplies air.

[0075] In this embodiment, through the pressure reducing valve 1 and the automatic air supply valve 2, the system can accurately control the air pressure to meet the requirements of different processes for the clamping force, and the setting of the safety valve 4 ensures that the system will not be over-pressurized under abnormal circumstances, thereby improving the safety of the system. In addition, the cooperation of the automatic air supply valve 2 and the air pressure sensor 5 realizes the automation of the air supply system, improves the operating efficiency and system stability, and the existence of the bypass valve 3 makes it easy to bypass the system when maintaining or replacing the valve, which is convenient for operation.

[0076] More specifically, dry, oil-free air, nitrogen or oxygen (pressure ≥ 0.1MPa, atmospheric dew point ≤ -60°C) is decompressed by the pressure reducing valve 1 and then enters the first space through the automatic air supply valve 2. To prevent the pressure reducing valve 1 from malfunctioning, the pressure reducing valve 1 is configured as a dual-circuit, one for use and one for backup; the automatic air supply valve 2 is also provided with a bypass valve 3; and a safety valve 4 is provided on the first pipeline entering the first space as the final protection measure. When the adsorber 6 is in operation, the PLC control program automatically detects the working pressure of the first space through the air pressure sensor 5 to stabilize it within a fixed range. When the working pressure is lower than the set first threshold, an opening command is issued to the automatic air supply valve 2 to start air supply. When the pressure reaches the set second threshold, a closing command is issued to the automatic air supply valve 2 to end air supply.

[0077] When the automatic air supply valve 2 or the pressure reducing valve 1 fails and causes the working pressure of the first space to be too high or too low, the PLC control program issues a shutdown command and the adsorber 6 stops working to protect the compression membrane and other components and then the molecular sieve.

[0078] In addition, after the PLC control program is set, it automatically counts the number of gas replenishments within a period of time and compares it with the previous statistical period, and automatically alarms when a large change occurs.

[0079] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An energy-saving pressure swing adsorption oxygen production equipment molecular sieve intelligent compression system, characterized in that: include: An adsorber (6) comprising a cylinder (61), the top of which is detachably connected to a top cover (62); An inner hole cylinder, a middle hole cylinder, and an outer hole cylinder (65) are sequentially distributed in the cylinder body (61), wherein an oxygen generating adsorbent (63) is arranged between the inner hole cylinder and the middle hole cylinder, and a dehydration adsorbent (64) is arranged between the middle hole cylinder and the outer hole cylinder (65); A compression film (7) is detachably fixed to the adsorber (6), and the compression film (7) is located above the inner hole cylinder, the middle hole cylinder, and the outer hole cylinder (65), and a first space is formed between the top of the compression film (7) and the adsorber (6); and an air supply system, which is used to supply air to the first space so as to compress the compression film (7) with a first air pressure, and to compress the oxygen-generating adsorbent (63) and the dehydration adsorbent (64) through the compression film (7); The compression film (7) is a disc-shaped structure, and radially outwardly therefrom are a first film body (71), a second film body (72), and a third film body (73), wherein the third film body (73) is detachably fixed to the adsorber (6), and there is a first height difference between the third film body (73) and the first film body (71); A ring plate (9) is fixed on the side wall of the adsorber (6) for supporting the third membrane body (73). A plurality of bolts (11) are also arranged on the side wall of the adsorber (6) and are spaced apart along the circumference of the adsorber (6). The height of the bolts (11) is adjustable. The bottoms of the plurality of bolts (11) are commonly connected to a clamping ring (10), and the third membrane body (73) can be clamped onto the ring plate (9) through the clamping ring (10); The thickness of the third film body (73) is greater than the thickness of the first film body (71) and the second film body (72); A liquid pre-pressing component (8) is placed on the upper surface of the pressing film (7), and in a natural state, the weight of the liquid pre-pressing component (8) acts on the pressing film (7); The liquid pre-pressing component (8) comprises: Support ring (82); a ferrule (84), wherein the ferrule (84) is sleeved on the outside of the bolt (11) and the ferrule (84) is fixed on the support ring (82), and the bolt (11) is arranged on the side wall of the adsorber (6); and A sealing film (83) is fixed to the inner side of the support ring (82), and a liquid is pre-placed inside the sealing film (83). In a natural state, a second height difference exists between the lower surface of the support ring (82) and the lower surface of the sealing film (83), and the second height difference is smaller than the first height difference; A support plate (81) is fixed to the inner surface of the sealing membrane (83). The diameter of the support plate (81) is larger than the diameter of the inner hole cylinder. The support plate (81) can cover the entire cross-section of the inner hole cylinder, providing uniform support for the sealing membrane (83) and ensuring that the liquid can be evenly distributed on the compression membrane.

2. According to claim 1, the molecular sieve intelligent compression system for energy-saving pressure swing adsorption oxygen production equipment is characterized in that: An annular gap is left between the outer porous tube (65) and the cylinder body (61) to allow oxygen to enter the annular gap and be discharged. The upper surface of the outer porous tube (65) is higher than the first membrane body (71). The side of the support ring (82) close to the second membrane body (72) is inclined and gradually inclines toward the outer side of the support ring (82) from bottom to top so as to press the second membrane body (72) into the outer porous tube (65).

3. The intelligent compression system for molecular sieves used in energy-saving pressure swing adsorption oxygen production equipment according to claim 1 is characterized in that: The air supply system comprises a first pipeline for supplying air to the first space, a pressure reducing valve (1) and an automatic air supply valve (2) being connected in series on the first pipeline, another pressure reducing valve being connected in parallel on one side of the pressure reducing valve (1), and a bypass valve (3) being connected in parallel on one side of the automatic air supply valve (2), and a safety valve (4) and an air pressure sensor (5) being provided on the first pipeline, and when the air pressure sensor (5) detects that the air pressure is lower than a first threshold value, the automatic air supply valve (2) supplies air.

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