Molecular sieve oxygen production equipment and control system and method thereof

Abstract

The invention discloses molecular sieve oxygen generation equipment and a control system and method thereof, and belongs to the field of molecular sieves. Each oxygen generation system comprises an air pretreatment tank, an air compressor, a pressure sensor, a temperature and humidity sensor, a main pipeline, a pipeline system, a gas storage tank, an oxygen storage tank valve, an oxygen storage tank, an oxygen concentration detector, a flow meter, a vacuum pump, an electromagnetic valve, a first adsorber, a second adsorber, a vacuum pressure sensor and an electric cabinet. The prepared molecular sieve is good in adsorption performance and adsorption effect; the adsorption efficiency and the oxygen production safety are improved, the stable purity of the product oxygen is ensured, and the robustness of a control system to the change of working conditions is improved. And meanwhile, single-effect oxygen production, double-effect oxygen production, triple-effect oxygen production and quadruple-effect oxygen production can be realized, different oxygen production levels can be selected according to actual application conditions, the application range of the equipment is greatly expanded, and relatively high practicability is achieved.

Description

Technical Field

[0001] This invention belongs to the field of molecular sieve technology, specifically relating to a molecular sieve oxygen generation device and its control system and method. Background Technology

[0002] Molecular sieve oxygen generators primarily produce high-purity oxygen by adsorbing carbon dioxide and nitrogen from the air using molecular sieves. Specifically, molecular sieve oxygen generators generally employ a pressurized adsorption-atmospheric desorption (HP) method. When the raw air is pressurized by a compressor, it passes through an air pretreatment device to remove solid impurities such as oil and dust, as well as water, and is cooled to room temperature. The treated compressed air then enters the adsorption tower containing the molecular sieves through the inlet valve. Nitrogen and carbon dioxide in the air are adsorbed by the molecular sieves, and the outflowing gas is high-purity oxygen. When the adsorption tower reaches a certain saturation level, the inlet valve closes, the flushing valve opens, and the adsorption tower enters the flushing stage. After flushing is complete, the flushing valve closes, and the desorption valve opens, entering the desorption regeneration stage, thus completing one cycle.

[0003] Currently, molecular sieve oxygen generation equipment mainly faces the following technical problems: 1. During the oxygen production process, molecular sieves of different structures and qualities may experience a decline in adsorption performance and a decrease in adsorption effect after prolonged operation, resulting in oxygen concentrations that cannot meet the usage requirements.

[0004] 2. Challenges in process cycle and control; (1) Optimization of adsorption and desorption time: When the adsorption time is too short, the molecular sieve does not reach saturation, resulting in low production capacity; when the adsorption time is too long, nitrogen penetrates, leading to a decrease in oxygen purity. When the desorption time or vacuum is insufficient, desorption is incomplete, and residual nitrogen will affect the adsorption effect of the next cycle; if desorption is excessive, energy will be wasted.

[0005] (2) Energy recovery and loss in the pressure equalization process: The pressure equalization step (pressure balance between adsorption towers) can save energy significantly, but the pressure equalization process itself has pressure fluctuations and mixing losses, and cannot achieve the theoretical ideal energy recovery efficiency.

[0006] (3) Dew point control: If the pretreatment is not thorough or the regeneration is insufficient, the product oxygen may contain trace amounts of moisture, which may affect certain applications (such as welding and electronic manufacturing).

[0007] (4) Hydrocarbon risk: If oil removal is not thorough, trace amounts of oil vapor entering the oxygen-rich environment may pose a safety hazard of combustion or explosion.

[0008] (5) Oxygen purity fluctuations: Oxygen purity may drop briefly during valve switching, load changes, or operating condition fluctuations. Therefore, a fast-response control system and buffering measures are needed to ensure stable product oxygen purity. Summary of the Invention

[0009] To address the problems existing in the prior art, the present invention provides a molecular sieve oxygen generation device and its control system and method.

[0010] The technical solution adopted by this invention to solve the technical problem is as follows: This invention provides a molecular sieve oxygen generation device, comprising: two identical oxygen generation systems, each system including: an air pretreatment tank with a nitrogen vent, an air compressor, a temperature and humidity sensor, and a gas storage tank mounted on the air pretreatment tank; a piping system connected to the gas storage tank via a main pipeline; a first and a second adsorber connected to the piping system; a pipe seven connected to the first adsorber; a pipe six connected to pipe seven; a solenoid valve two installed between pipe seven and pipe six; a pipe five connected to the second adsorber; a pipe six connected to pipe five; a solenoid valve one installed between pipe five and pipe six; an oxygen storage tank mounted on the first and second adsorbers; an oxygen storage tank valve mounted on the oxygen storage tank; a pipe three connected to the oxygen storage tank valve; an oxygen concentration detector mounted on pipe three; and a pipe four connected to pipe three. A flow meter is installed on pipe four; pipe nine is connected to pipe four; a vacuum pump is installed on the first and second adsorbers for evacuating the first and second adsorbers; a vacuum pressure sensor is installed on the first and second adsorbers for measuring the internal vacuum level; molecular sieves are installed in the first and second adsorbers; the air pretreatment tank is equipped with a compressed air storage tank, a carbon dioxide filter, a moisture filter, and an oil vapor filter; the measuring end of the air compressor extends into the compressed air storage tank; the measuring end of the temperature and humidity sensor extends into the gas storage tank; the gas storage tank is connected to the outlet of the oil vapor filter through pipe one; the gas storage tank has a nitrogen outlet valve, which is connected to the nitrogen exhaust port of the air pretreatment tank through pipe two; pipe nine in both oxygen generation systems is connected to pipe eight.

[0011] Furthermore, the gas storage tank is equipped with a cooling device for cooling the pretreated compressed air to room temperature.

[0012] Furthermore, the compressed air storage tank, carbon dioxide filter, moisture filter, and oil vapor filter are connected in sequence via pipes and solenoid valves.

[0013] Furthermore, pipe eight is connected to pipe ten, pipe ten is connected to pipe eleven, and flow meter two is installed on pipe ten.

[0014] Furthermore, it also includes an electrical control box, which houses the control system.

[0015] Furthermore, the piping system comprises a first air pipe, solenoid valve three, solenoid valve four, a second air pipe, a third air pipe, a fourth air pipe, a fifth air pipe, a sixth air pipe, a seventh air pipe, an eighth air pipe, a ninth air pipe, a tenth air pipe, an eleventh air pipe, a twelfth air pipe, a thirteenth air pipe, a valve, a fifteenth air pipe, solenoid valve five, solenoid valve six, and a sixteenth air pipe; the lower end of the main pipe is connected to the first air pipe and the sixteenth air pipe respectively via pipe connectors; solenoid valve three is installed on the first air pipe; the first air pipe is connected to the third air pipe; the third air pipe is connected to the second air pipe and the sixth air pipe respectively via pipe connectors; the second air pipe is connected to the fourth air pipe; and the second air pipe... A solenoid valve four is installed between the fourth air pipe and the fifth air pipe and the seventh air pipe respectively via pipe connectors; a solenoid valve six is ​​installed on the sixteenth air pipe, which is connected to the eighth air pipe, which is connected to the thirteenth air pipe and the ninth air pipe respectively via pipe connectors, and the thirteenth air pipe is connected to the eleventh air pipe; a solenoid valve five is installed between the thirteenth air pipe and the eleventh air pipe, which is connected to the twelfth air pipe respectively via pipe connectors; the seventh air pipe, the twelfth air pipe, and the fifteenth air pipe are connected via pipe connectors, and the valve is installed on the fifteenth air pipe.

[0016] Furthermore, the molecular sieve is prepared as follows: (1) Weigh NaY zeolite and ZSM-5 zeolite according to the mass ratio of (1-2): (3-5), mix them evenly, calcine them at high temperature and then cool them. Finally, pulverize them to 80-100 mesh to obtain mixed powder. (2) Weigh out raptosite, montmorillonite and dickite in a mass ratio of (0.3-0.5):(0.5-0.9):(0.6-0.8), mix them evenly and then pulverize them to 80-100 mesh. Then add lithium magnesium silicate, the amount of which is 1%-5% of the total amount of raptosite, montmorillonite and dickite. Heat at 90℃-110℃ for 30min-1h, and then disperse, filter and dry the mixture in polyvinyl alcohol to obtain mixed powder II. (3) Weigh mixed powder one and mixed powder two according to the mass ratio of (1-2): (0.1-0.3). After mixing evenly, add crystallization guide agent and react at 90℃-110℃ for 16h-24h. Finally, after drying, grinding and sieving, a preliminary molecular sieve is obtained. Then, it is added to lithium borohydride solution and soaked for 1.5h-3h to obtain the final molecular sieve.

[0017] Furthermore, the preparation method of the crystallization guiding agent is as follows: The sodium aluminate solution and water glass were heated to 30℃-35℃ respectively. The sodium aluminate solution was added to the water glass under strong stirring. The volume ratio of sodium aluminate solution to water glass was (0.15-0.35):(0.5-1.5). After stirring for 10min-15min, the mixture was placed in a constant temperature environment of 30℃-35℃ for 20h-30h to prepare a crystallization guiding agent.

[0018] The present invention provides a control system for a molecular sieve oxygen generator, which specifically includes: The main control module is used to coordinate the operation of the equipment control module, tank control module, valve control module, sensor control module, flow measurement control module, and concentration detection control module, and comprehensively control the entire process of molecular sieve oxygen production. The main control module uses a built-in comparison algorithm to calculate and compare the pressure, temperature and humidity of the compressed air in the compressed air storage tank, the oxygen concentration and flow rate in the oxygen storage tank, and the pressure in the first and second adsorbers with the system settings. The equipment control module is used to control the opening and closing times of the cooling devices in the carbon dioxide filter, moisture filter, oil vapor filter, air compressor, vacuum pump, first adsorber, second adsorber, and gas storage tank; The tank control module is used to control the opening and closing times of the compressed air storage tank, gas storage tank, and oxygen storage tank. The valve control module is used to control the opening and closing times of solenoid valves 1, 2, 3, 4, 5, and 6, as well as the valves of the oxygen storage tank. The sensor control module is used to strictly control the on and off times of the air compressor, temperature and humidity sensor, and vacuum pressure sensor. The flow measurement and control module is used to control the opening and closing times of flow meter 1 and flow meter 2; The concentration detection and control module is used to control the on and off times of the oxygen concentration detector.

[0019] The present invention provides a control method for a molecular sieve oxygen generator, which specifically includes the following steps: Step S1: Air compression process; The equipment control module controls the air compressor to start, the air compressor compresses the outside air and stores the compressed air in the compressed air storage tank, and the sensor control module controls the air compressor to measure the pressure of the compressed air in real time and feed it back to the main control module for calculation and judgment. Step S2: Compressed air pretreatment; When the compressed air pressure reaches the system requirements, the main control module starts the compressed air pretreatment stage; the tank control module controls the compressed air temporary storage tank and gas storage tank to open in sequence, the equipment control module controls the carbon dioxide filter, moisture filter and oil vapor filter to open in sequence, and the sensor control module controls the temperature and humidity sensor to open; the compressed air passes through the carbon dioxide filter to remove carbon dioxide, through the moisture filter to remove moisture, and through the oil vapor filter to remove oil vapor, resulting in clean compressed air, which is temporarily stored in the gas storage tank. The equipment control module controls the cooling device to cool it, and the temperature and humidity sensor measures the temperature and humidity of the compressed air in real time and feeds it back to the main control module for calculation and judgment. Step S2: Adsorption oxygen generation process; When the temperature and humidity of the compressed air meet the system requirements, the main control module starts the adsorption oxygen generation stage. (1) Single-effect oxygen generation process; The equipment control module controls the opening of the first adsorber in the first oxygen generation system. The valve control module controls the opening of solenoid valve six and valve two, while simultaneously controlling the closing of solenoid valve one, solenoid valve two, and other solenoid valves in the pipeline system. The tank control module controls the sequential opening of the gas storage tank and oxygen storage tank. Compressed air sequentially passes through the main pipeline, the sixteenth gas pipe, the eighth gas pipe, and the ninth gas pipe before entering the first adsorber. Nitrogen is efficiently adsorbed by the molecular sieve in the first adsorber, and the resulting oxygen is collected sequentially through the tenth, twelfth, and fifteenth gas pipes into the oxygen storage tank. When a certain amount of oxygen is stored in the oxygen storage tank, the main control module controls all modules to pause operation to stop oxygen generation. At this time, the valve control module is restarted to open the oxygen storage tank valve, and the concentration detection control module is restarted to turn on the oxygen concentration detector. This allows the oxygen in the oxygen storage tank to sequentially pass through pipelines three, four, nine, eight, and ten before reaching pipeline eleven. The oxygen concentration detector measures the oxygen concentration in real time and feeds it back to the main control module. The module performs calculations and judgments. When it detects that the oxygen concentration does not meet the system requirements, the oxygen purity is unqualified. At this time, the connector of pipe eleven is connected to solenoid valve two, the valve control module is restarted to control solenoid valve two to open, and the tank control module is restarted to control the oxygen storage tank to open. The oxygen is reintroduced into the first adsorber through pipe seven for secondary nitrogen adsorption. The obtained oxygen is collected again in the oxygen storage tank. The oxygen concentration detector measures the oxygen concentration in real time until the oxygen concentration meets the system requirements. Then, the valve control module is activated to control solenoid valve two to close, completing the single-effect oxygen generation process. At this time, the connector of pipe eleven is connected to the external oxygen-using equipment to supply oxygen. During the single-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the flow meter one to open. The flow meter one measures the oxygen flow in real time and feeds it back to the main control module for calculation and judgment. The above process is the same when using the second adsorber in the first oxygen generation system, the first adsorber in the second oxygen generation system, or the second adsorber in the second oxygen generation system for single-effect oxygen generation. (2) Dual-effect oxygen generation process; The equipment control module controls the simultaneous opening of the first and second adsorbers in the first oxygen generation system, or the simultaneous opening of the first and second adsorbers in the second oxygen generation system. The valve control module controls the opening of solenoid valves six and three, and valve one. Referring to the single-effect oxygen generation method, oxygen is collected into the oxygen storage tank. The oxygen concentration detector measures the oxygen concentration in real time and feeds it back to the main control module for calculation and judgment. When the oxygen concentration is found to be below the system requirements, the oxygen purity is considered unqualified. At this time, the joint of pipe eleven is connected to solenoid valve two, and the valve control module controls the opening of solenoid valves two and one, distributing the oxygen. The oxygen is reintroduced into the first adsorber via pipe seven and into the second adsorber via pipes six and five for secondary nitrogen adsorption. The resulting oxygen is then collected in the oxygen storage tank. The oxygen concentration detector measures the oxygen concentration in real time until it reaches the system requirements. At this point, the valve control module controls solenoid valves two and one to close, completing the double-effect oxygen generation process. Meanwhile, the oxygen supply equipment is connected to the connector of pipe eleven. During the double-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls flow meter one to open. Flow meter one measures the oxygen flow rate in real time and feeds it back to the main control module for calculation and judgment. (3) Triple-effect oxygen generation process; The equipment control module controls the first and second adsorbers in the first oxygen generation system and the first or second adsorber in the second oxygen generation system to start, and performs triple-effect oxygen generation with reference to the single-effect oxygen generation method and the double-effect oxygen generation method. During the triple-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the flow meter one and flow meter two to start. Flow meter one in the two oxygen generation systems measures the oxygen flow of the two branches in real time and feeds it back to the main control module for calculation and judgment. Flow meter two measures the total oxygen flow in real time and feeds it back to the main control module for calculation and judgment. (4) Four-effect oxygen generation process; The equipment control module controls the first and second adsorbers in the first oxygen generation system and the first and second adsorbers in the second oxygen generation system to be turned on simultaneously, and performs four-effect oxygen generation by referring to the single-effect oxygen generation method, the double-effect oxygen generation method, and the triple-effect oxygen generation method. During the four-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the flow meter one and flow meter two to be turned on. Flow meter one in the two oxygen generation systems measures the oxygen flow of the two branches in real time and feeds it back to the main control module for calculation and judgment. Flow meter two measures the total oxygen flow in real time and feeds it back to the main control module for calculation and judgment. Step S4: Desorption and regeneration process; Taking the single-effect oxygen generation method (1) in the adsorption oxygen generation stage as an example, the equipment control module controls the vacuum pump to turn on and vacuum the first adsorber to reduce the pressure. During the desorption and regeneration process, the sensor control module controls the vacuum pressure sensor to turn on. The vacuum pressure sensor measures the pressure in the first adsorber in real time and feeds it back to the main control module for calculation and judgment. When the pressure reaches the system requirements, the equipment control module controls the vacuum pump to turn off, the valve control module controls the solenoid valve five to turn on, and the tank control module controls the gas storage tank to turn on. The nitrogen desorbed in the first adsorber enters the gas storage tank in sequence through the tenth gas pipe, the eleventh gas pipe, the thirteenth gas pipe, the eighth gas pipe, the sixteenth gas pipe, and the main pipeline. At the same time, the nitrogen in the first adsorber also enters the gas storage tank in sequence through the ninth gas pipe, the eighth gas pipe, the sixteenth gas pipe, and the main pipeline. When it is necessary to remove nitrogen, the nitrogen outlet valve of the gas storage tank is opened, and the nitrogen is removed through the second pipeline and the nitrogen outlet of the air pretreatment tank.

[0020] The beneficial effects of this invention are: 1. The molecular sieve prepared in this invention uses lithium magnesium silicate as the basic structure, and NaY zeolite and ZSM-5 zeolite as the framework structure. The stability of the framework structure is enhanced by adding attapulgite, montmorillonite, and dickite, making the framework structure less prone to breakage and improving the service life of the molecular sieve. Experiments have shown that the prepared molecular sieve can be recycled for 19,000-21,000 hours, greatly improving its service life. Simultaneously, the adsorption performance of the prepared molecular sieve is significantly improved, with excellent nitrogen adsorption effect.

[0021] 2. Process cycle and control optimization; (1) During the adsorption and desorption process, the opening and closing time of the adsorber is strictly controlled by the equipment control module. At the same time, during the desorption process, the pressure in the adsorber is measured in real time by the vacuum pressure sensor and fed back to the main control module for calculation and judgment. This can optimize the adsorption and desorption time, thereby optimizing the process cycle and control process, improving adsorption efficiency, and avoiding resource waste.

[0022] (2) In the air pre-compression and pretreatment stage, moisture is first removed by the moisture filter 103, and the temperature and humidity of the air are measured in real time by the temperature and humidity sensor. When the moisture is not completely removed, the dehydration time can be extended by the control system to ensure that the moisture is completely removed. At the same time, in the desorption and regeneration stage, the nitrogen released by the molecular sieve in the adsorber is returned to the gas storage tank 8 through the original route, which can prevent external moisture from entering the adsorber through the pipeline and ensure the sufficiency of molecular sieve regeneration. In addition, the oxygen concentration is measured in real time by the oxygen concentration detector 12 during the oxygen production process, which can also ensure the oxygen purity requirements.

[0023] (3) Remove steam through an oil vapor filter to improve the safety of oxygen production.

[0024] (4) By designing a fast-response control system, the opening and closing time of each solenoid valve is strictly controlled by the valve control module, so as to achieve extremely high reliability of high-speed switching solenoid valves and ensure stable oxygen purity of the product.

[0025] 3. This invention improves the robustness of the control system to changes in operating conditions by designing a control system and control method, achieving complex, fast, and precise control and parameter optimization (time, pressure, flow rate) of the cyclic process, and by stably controlling the oxygen purity.

[0026] 4. The molecular sieve oxygen generator designed in this invention can achieve single-effect oxygen generation, double-effect oxygen generation, triple-effect oxygen generation, and quadruple-effect oxygen generation. Different oxygen generation levels can be selected according to actual application conditions, which greatly expands the application range of the equipment and has strong practicality. Attached Figure Description

[0027] Figure 1 This is a schematic diagram of the structure of a molecular sieve oxygen generator provided by the present invention.

[0028] Figure 2 This is a schematic diagram of the pipeline system structure.

[0029] Figure 3 This diagram illustrates the connection relationships between the compressed air storage tank, carbon dioxide filter, moisture filter, and oil vapor filter.

[0030] Figure 4 This is a schematic diagram of the structural composition of a control system for a molecular sieve oxygen generator provided by the present invention.

[0031] Figure 5 A flowchart of a control method for a molecular sieve oxygen generator provided by the present invention.

[0032] In the diagram, the components are: air pretreatment tank 1, compressed air storage tank 101, carbon dioxide filter 102, moisture filter 103, oil vapor filter 104, air compressor 2, pressure sensor 3, temperature and humidity sensor 4, main pipeline 5, piping system 6, pipeline one 7, gas storage tank 8, pipeline two 9, oxygen storage tank valve 10, oxygen storage tank 11, oxygen concentration detector 12, pipeline three 13, pipeline four 14, flow meter one 15, vacuum pump 16, pipeline five 17, solenoid valve one 18, pipeline six 19, pipeline seven 20, solenoid valve two 21, and pipe... Pipeline 8 22, Pipeline 9 23, Flowmeter 2 24, Pipeline 10 25, Pipeline 11 26, First Air Pipe 27, Solenoid Valve 3 28, Solenoid Valve 4 29, Second Air Pipe 30, Third Air Pipe 31, Fourth Air Pipe 32, Fifth Air Pipe 33, Sixth Air Pipe 34, Seventh Air Pipe 35, Eighth Air Pipe 36, Ninth Air Pipe 37, Tenth Air Pipe 38, Eleventh Air Pipe 39, Twelfth Air Pipe 40, Thirteenth Air Pipe 41, Valve 42, Fifteenth Air Pipe 43, Solenoid Valve 5 44, Solenoid Valve 6 45, Sixteenth Air Pipe 46, First Adsorber A, Second Adsorber B. Detailed Implementation

[0033] In a first aspect, the present invention provides a molecular sieve oxygen generation device.

[0034] See Figures 1 to 3 As shown, the present invention provides a molecular sieve oxygen generation device, which includes two oxygen generation systems with the same structure. The two oxygen generation systems are connected by a pipe 22, which is connected to a pipe 25. A flow meter 24 is installed at the upper end of the pipe 25, and the upper end of the pipe 25 is connected to a pipe 26. The pipe 26 can be connected to an external oxygen-using device.

[0035] The oxygen generation system is described below, and it includes the following components: Air pretreatment tank 1, air compressor 2, pressure sensor 3, temperature and humidity sensor 4, main pipeline 5, piping system 6, pipeline one 7, gas storage tank 8, pipeline two 9, oxygen storage tank valve 10, oxygen storage tank 11, oxygen concentration detector 12, pipeline three 13, pipeline four 14, flow meter one 15, vacuum pump 16, pipeline five 17, solenoid valve one 18, pipeline six 19, pipeline seven 20, solenoid valve two 21, pipeline nine 23, first adsorber A, second adsorber B, vacuum pressure sensor and electrical control box.

[0036] Specifically, the air pretreatment tank 1 is equipped with a nitrogen vent for discharging nitrogen. Additionally, the air pretreatment tank 1 contains a compressed air storage tank 101, a carbon dioxide filter 102, a moisture filter 103, and an oil vapor filter 104. These components are sequentially connected via pipes and solenoid valves.

[0037] Specifically, the number of air compressors 2 can be set according to actual needs (for example, two units). Air compressors 2 are installed on the upper end of air pretreatment tank 1. Pressure sensor 3 and temperature / humidity sensor 4 are then installed on the upper end of air pretreatment tank 1, respectively, with pressure sensor 3 and temperature / humidity sensor 4 located on opposite sides of air compressor 2. The measuring end of pressure sensor 3 extends into compressed air storage tank 101 to measure the pressure of compressed air in compressed air storage tank 101. The measuring end of temperature / humidity sensor 4 extends into gas storage tank 8 to measure the temperature and humidity of the pretreated compressed air.

[0038] According to the present invention, the air compressor 2 compresses the air and stores it in the compressed air storage tank 101. Then, the compressed air can be processed by passing it through the carbon dioxide filter 102, the moisture filter 103 and the oil vapor filter 104 in sequence to obtain compressed air after removing carbon dioxide, moisture and oil vapor.

[0039] Specifically, the outlet of the oil vapor filter 104 is connected to the lower end of the pipe 7, while the upper end of the pipe 7 extends into the air pretreatment tank 1 and is connected to the gas storage tank 8. The pretreated compressed air can be temporarily stored in the gas storage tank 8.

[0040] Specifically, the gas storage tank 8 is installed on the outer wall of the air pretreatment tank 1. The gas storage tank 8 is equipped with a cooling device to cool the pretreated compressed air to room temperature. Simultaneously, the nitrogen outlet valve of the gas storage tank 8 is connected to the nitrogen vent of the air pretreatment tank 1 via pipe 2 9 for discharging nitrogen.

[0041] Specifically, one end of the main pipeline 5 is connected to the gas storage tank 8, and the other end is connected to the pipeline system 6 through pipeline connectors.

[0042] Specifically, the pipeline system 6 mainly consists of the first air pipe 27, solenoid valve 3 28, solenoid valve 4 29, second air pipe 30, third air pipe 31, fourth air pipe 32, fifth air pipe 33, sixth air pipe 34, seventh air pipe 35, eighth air pipe 36, ninth air pipe 37, tenth air pipe 38, eleventh air pipe 39, twelfth air pipe 40, thirteenth air pipe 41, valve 42, fifteenth air pipe 43, solenoid valve 5 44, solenoid valve 6 45 and sixteenth air pipe 46. The lower end of the main pipe 5 is connected to the first air pipe 27 and the sixteenth air pipe 46 via pipe connectors. A solenoid valve 28 is installed on the first air pipe 27. The first air pipe 27 is connected to the third air pipe 31. The third air pipe 31 is connected to the second air pipe 30 and the sixth air pipe 34 via pipe connectors. The second air pipe 30 is connected to the fourth air pipe 32. A solenoid valve 29 is installed between the second air pipe 30 and the fourth air pipe 32. The fourth air pipe 32 is connected to the fifth air pipe 33 and the seventh air pipe 35 via pipe connectors. A solenoid valve is installed on the sixteenth air pipe 46. The sixteenth air pipe 45 and the sixteenth air pipe 46 are connected to the eighth air pipe 36. The eighth air pipe 36 is connected to the thirteenth air pipe 41 and the ninth air pipe 37 respectively through pipe connectors. The thirteenth air pipe 41 is connected to the eleventh air pipe 39. A solenoid valve 44 is installed between the thirteenth air pipe 41 and the eleventh air pipe 39. The eleventh air pipe 39 is connected to the twelfth air pipe 40 respectively through pipe connectors. The seventh air pipe 35, the twelfth air pipe 40 and the fifteenth air pipe 43 are connected through pipe connectors. A valve 42 is installed on the fifteenth air pipe 43.

[0043] The fifth air pipe 33 and the sixth air pipe 34 are both connected to one end of the second adsorber B; at the same time, the ninth air pipe 37 and the tenth air pipe 38 are both connected to one end of the first adsorber A.

[0044] Specifically, the other end of the second adsorber B is connected to pipe 5 17, which is connected to one end of pipe 6 19. At the same time, a solenoid valve 18 is installed between pipe 5 17 and pipe 6 19. The other end of the first adsorber A is connected to pipe 7 20, which is connected to the other end of pipe 6 19. At the same time, a solenoid valve 21 is installed between pipe 7 20 and pipe 6 19.

[0045] Specifically, the first adsorber A and the second adsorber B are placed in parallel, and the oxygen storage tank 11 can be installed on the first adsorber A and the second adsorber B to save space. The fifteenth gas pipe 43 is connected to the oxygen storage tank 11. At the same time, an oxygen storage tank valve 10 is installed at the upper end of the oxygen storage tank 11. The oxygen storage tank valve 10 is connected to pipe three 13. An oxygen concentration detector 12 is installed on pipe three 13. Pipe three 13 is connected to pipe four 14. A flow meter 15 is installed on pipe four 14. Pipe four 14 is connected to pipe nine 23. Pipe nine 23 in both oxygen generation systems is connected to pipe eight 22 through pipe connectors.

[0046] Specifically, a vacuum pump 16 is installed on the first adsorber A and the second adsorber B, respectively, and the vacuum pump 16 is connected to the first adsorber A and the second adsorber B through pipes. The vacuum pump 16 can be used to evacuate the first adsorber A and the second adsorber B respectively.

[0047] Specifically, vacuum pressure sensors are installed on the first adsorber A and the second adsorber B respectively to measure the vacuum level inside the first adsorber A and the second adsorber B.

[0048] Specifically, molecular sieves are loaded into the first adsorber A and the second adsorber B.

[0049] Preferably, the specific preparation method of the molecular sieve is as follows: (1) Weigh NaY zeolite and ZSM-5 zeolite according to the mass ratio of NaY zeolite to ZSM-5 zeolite of (1-2):(3-5) (preferably 1.5:4), mix them evenly, calcine them at high temperature (preferably 90℃-120℃, more preferably 100℃) and then cool them. Finally, pulverize them to 80-100 mesh (preferably 90 mesh) to obtain mixed powder one; (2) Weigh out raptosite, montmorillonite and dickite in a mass ratio of (0.3-0.5):(0.5-0.9):(0.6-0.8) (preferably 0.4:0.7:0.7), mix them evenly and then pulverize them to 80-100 mesh (preferably 90 mesh). Then add magnesium lithium silicate, the amount of magnesium lithium silicate added is 1%-5% (preferably 3.5%) of the total amount of raptosite, montmorillonite and dickite. Heat at a temperature of 90℃-110℃ (preferably 100℃) for 30min-1h (preferably 45min). Then, disperse, filter and dry the mixture in polyvinyl alcohol to obtain mixed powder II. (3) Weigh out mixed powder one and mixed powder two according to the mass ratio of mixed powder one to mixed powder two of (1-2): (0.1-0.3) (preferably 1.5:0.2). After mixing evenly, add crystallization guiding agent and react at a temperature of 90℃-110℃ (preferably 100℃) for 16h-24h (preferably 20h). Finally, after drying, grinding and sieving, a preliminary molecular sieve is obtained. Then, it is added to lithium borohydride solution and soaked for 1.5h-3h (preferably 2.5h) to obtain the final molecular sieve.

[0050] The specific preparation method of the crystallization guiding agent is as follows: The sodium aluminate solution and water glass are respectively adjusted to 30℃-35℃ (preferably 33℃). Then, the sodium aluminate solution is added to the water glass under strong stirring. The volume ratio of sodium aluminate solution to water glass is (0.15-0.35):(0.5-1.5) (preferably 0.2:1.0). After stirring continuously for 10min-15min, the mixture is placed in a constant temperature environment of 30℃-35℃ (preferably 33℃) for aging treatment for 20h-30h (preferably 25h) to prepare a crystallization guiding agent.

[0051] The molecular sieve prepared in this invention uses lithium magnesium silicate as the basic structure, and NaY zeolite and ZSM-5 zeolite as the framework structure. The stability of the framework structure is enhanced by adding attapulgite, montmorillonite, and dickite, making the framework structure less prone to breakage and improving the service life of the molecular sieve. Experiments have shown that the prepared molecular sieve can be recycled for 19,000-21,000 hours, greatly improving its service life. Simultaneously, the adsorption performance of the prepared molecular sieve is significantly improved, with excellent nitrogen adsorption effect.

[0052] Specifically, the electrical control box can be installed inside the air pretreatment tank 1, and its specific installation location is not limited. A control system is also installed inside the electrical control box to control the efficient operation of the molecular sieve oxygen generator.

[0053] The present invention provides a molecular sieve oxygen generator, the specific method of which is as follows: 1. Air compression stage; The air compressor 2 is started by the control system to compress external air and store the compressed air in the compressed air storage tank 101. During the air compression process, the pressure sensor 3 measures the compressed air pressure in real time and feeds it back to the control system. When the air pressure reaches the system requirements, the compressed air pretreatment stage is started by the control system.

[0054] 2. Compressed air pretreatment stage; The control system activates compressed air storage tank 101, along with carbon dioxide filter 102, moisture filter 103, and oil vapor filter 104. Compressed air is then sequentially processed through these filters to remove impurities such as carbon dioxide, moisture, and oil vapor, resulting in pre-treated compressed air. Simultaneously, the pre-treated compressed air is temporarily stored in gas storage tank 8 via pipeline 7 and cooled by a cooling device. During the pre-treatment stage, the temperature and humidity of the compressed air collected in gas storage tank 8 are measured in real-time by temperature and humidity sensor 4. When the temperature and humidity of the compressed air meet the system requirements, the adsorption oxygen generation stage can be activated via the control system.

[0055] 3. Adsorption oxygen generation stage; After the air compression and adsorption oxygen generation stages, a certain amount of compressed air suitable for oxygen generation is stored in gas storage tank 8. At this point, the adsorption oxygen generation stage can be activated via the control system. Specifically, the adsorption oxygen generation methods can be categorized as follows: (1) Single-effect oxygen generation method; Single-effect oxygen production can be achieved by opening either the first adsorber A or the second adsorber B in the first oxygen production system. For example, when using the first adsorber A for single-effect oxygen production, the control system opens solenoid valve 45 and valve 42 in pipeline system 6, while simultaneously closing solenoid valve 18, solenoid valve 21, and other solenoid valves in pipeline system 6. Compressed air in gas storage tank 8 sequentially passes through main pipeline 5, sixteenth gas pipe 46, eighth gas pipe 36, and ninth gas pipe 37 before entering the first adsorber A. Nitrogen is efficiently adsorbed by the molecular sieve in the first adsorber A, and the resulting oxygen is collected sequentially through tenth gas pipe 38, twelfth gas pipe 40, and fifteenth gas pipe 43 into oxygen storage tank 11. The control system opens valve 10 of the oxygen storage tank, allowing the oxygen in oxygen storage tank 11 to be... After passing through pipes 3 (13), 4 (14), 9 (23), 8 (22), and 10 (25), the oxygen reaches pipe 11 (26). Simultaneously, oxygen concentration is monitored using oxygen concentration detector 12. If the oxygen concentration does not meet system requirements, the oxygen purity is considered insufficient. At this point, the connector of pipe 11 (26) is connected to solenoid valve 2 (21). The control system opens solenoid valve 2 (21) to allow oxygen to be reintroduced through pipe 7 (20) into the first adsorber A for secondary nitrogen adsorption. The obtained oxygen is then collected again in oxygen storage tank 11. Oxygen concentration is monitored in real-time using oxygen concentration detector 12 until the oxygen concentration meets system requirements. Then, solenoid valve 2 (21) is closed, completing the single-effect oxygen generation process. At this point, oxygen supply equipment can be connected to the connector of pipe 11 (26) for oxygen supply.

[0056] When using the second adsorber B for single-effect oxygen production, the above process can be referenced and will not be repeated here.

[0057] During the single-effect oxygen generation process, the oxygen flow rate is measured in real time by the flow meter 15 in the first oxygen generation system. The single-effect oxygen generation method can obtain a low flow rate (e.g., 1-2 L / min) of oxygen supply, which is suitable for application scenarios with low oxygen demand.

[0058] (2) Dual-effect oxygen generation method; Dual-effect oxygen generation can be achieved by simultaneously activating the first adsorber A and the second adsorber B in the first oxygen generation system. By controlling the system to open solenoid valves 6 (45), 3 (28), and 42 in pipeline system 6, oxygen is collected into oxygen storage tank 11, following the single-effect oxygen generation process. Simultaneously, oxygen concentration is detected using oxygen concentration detector 12. If the detected oxygen concentration does not meet system requirements, the oxygen purity is considered insufficient. At this point, the connector of pipeline 11 (26) is connected to solenoid valve 2 (21). The control system then activates solenoid valves 2 (21) and 1 (18) to reintroduce oxygen into the first adsorber A via pipeline 7 (20) and into the second adsorber B via pipelines 6 (19) and 5 (17) for secondary nitrogen adsorption. The resulting oxygen is again collected into oxygen storage tank 11. Oxygen concentration is monitored in real-time using oxygen concentration detector 12 until the oxygen concentration meets system requirements. Then, solenoid valves 2 (21) and 1 (18) are closed, completing the dual-effect oxygen generation process. At this point, the connector of pipeline 11 (26) can be connected to an external oxygen-consuming device for oxygen supply.

[0059] During the dual-effect oxygen generation process, the oxygen flow rate is measured in real time by the flow meter 15 in the first oxygen generation system. The dual-effect oxygen generation method can obtain a medium flow rate (e.g., 2-4 L / min) of oxygen supply, which is suitable for application scenarios with moderate oxygen demand.

[0060] (3) Triple-effect oxygen generation method; Triple-effect oxygen generation can be achieved by simultaneously activating the first adsorber A and the second adsorber B in the first oxygen generation system, and by activating either the first adsorber A or the second adsorber B in the second oxygen generation system.

[0061] In the triple-effect oxygen generator process, flow meters 15 in the two oxygen generator systems measure the oxygen flow rate of each of the two branches in real time, while flow meter 24 measures the total oxygen flow rate in real time. The triple-effect oxygen generator method can obtain a high flow rate (e.g., 4-6 L / min) of oxygen supply, which is suitable for applications with medium to high oxygen demand.

[0062] (4) Four-effect oxygen generation method; Four-effect oxygen generation can be achieved by simultaneously activating the first adsorber A and the second adsorber B in two oxygen generation systems.

[0063] In the four-effect oxygen generation process, flow meter 15 in each of the two oxygen generation systems measures the oxygen flow rate of the two branches in real time, while flow meter 24 measures the total oxygen flow rate in real time. The four-effect oxygen generation method can obtain a large flow rate (e.g., greater than 6 L / min) of oxygen supply, which is suitable for applications with high oxygen demand.

[0064] 4. Desorption and regeneration stage; The molecular sieve is regenerated by reducing the pressure in the first adsorber A and / or the second adsorber B, causing the adsorbed nitrogen gas to be released and discharged.

[0065] Specifically, taking the single-effect oxygen generation method (1) in the adsorption oxygen generation stage as an example, the vacuum pump 16 can be activated by the control system to evacuate the first adsorber A to reduce the pressure. During the process, the pressure in the first adsorber A is measured in real time by the vacuum pressure sensor. When the pressure reaches the system requirements, the vacuum pump 16 is turned off by the control system and the solenoid valve 44 is activated. The nitrogen in the first adsorber A enters the gas storage tank 8 through the tenth gas pipe 38, the eleventh gas pipe 39, the thirteenth gas pipe 41, the eighth gas pipe 36, the sixteenth gas pipe 46, and the main pipeline 5 in sequence. At the same time, the nitrogen in the first adsorber A also enters the gas storage tank 8 through the ninth gas pipe 37, the eighth gas pipe 36, the sixteenth gas pipe 46, and the main pipeline 5 in sequence. When it is necessary to remove nitrogen, the nitrogen outlet valve of the gas storage tank 8 can be opened to remove nitrogen through the pipeline 9 and the nitrogen outlet.

[0066] Secondly, the present invention provides a control system for a molecular sieve oxygen generator.

[0067] See Figure 4 As shown, the control system for a molecular sieve oxygen generator provided by the present invention specifically includes the following components: The main control module is primarily used to coordinate the operation of the equipment control module, tank control module, valve control module, sensor control module, flow measurement control module, and concentration detection control module, comprehensively controlling the entire process of molecular sieve oxygen production. Simultaneously, the main control module also uses a built-in comparison algorithm (which can employ existing technology) to calculate and compare the pressure, temperature, and humidity of the compressed air in the compressed air storage tank 101, the oxygen concentration and flow rate in the oxygen storage tank 11, and the pressure in the first adsorber A and the second adsorber B with the system's set values. The equipment control module is used to strictly control the opening and closing times of the cooling devices in the carbon dioxide filter 102, moisture filter 103, oil vapor filter 104, air compressor 2, vacuum pump 16, first adsorber A, second adsorber B, and gas storage tank 8. The tank control module is used to strictly control the opening and closing times of the compressed air storage tank 101, the gas storage tank 8, and the oxygen storage tank 11. The valve control module is used to strictly control the opening and closing times of each solenoid valve (soleoid valve 18, solenoid valve 21, solenoid valve 328, solenoid valve 49, solenoid valve 544, solenoid valve 645), valve 42, and oxygen storage tank valve 10. The sensor control module is used to strictly control the opening and closing times of pressure sensor 3, temperature and humidity sensor 4, and vacuum pressure sensor. The flow measurement and control module is used to strictly control the opening and closing times of each flow meter (flow meter 15, flow meter 24); The concentration detection and control module is used to strictly control the opening and closing time of the oxygen concentration detector 12.

[0068] Thirdly, the present invention provides a control method for a molecular sieve oxygen generator.

[0069] See Figure 5 As shown, the control method for a molecular sieve oxygen generator provided by the present invention has the following specific implementation process: Step S1: Air compression process; The equipment control module controls the air compressor 2 to start, the air compressor 2 compresses the outside air and stores the compressed air in the compressed air storage tank 101. The sensor control module controls the pressure sensor 3 to measure the pressure of the compressed air in real time and feed it back to the main control module for calculation and judgment.

[0070] Step S2: Compressed air pretreatment; When the pressure of the compressed air reaches the system requirement (e.g., 0.6-1.0 MPa), the main control module starts the compressed air pretreatment stage.

[0071] The tank control module controls the compressed air temporary storage tank 101 and the gas storage tank 8 to open sequentially. The equipment control module controls the carbon dioxide filter 102, the moisture filter 103 and the oil vapor filter 104 to open sequentially. The sensor control module controls the temperature and humidity sensor 4 to open. The compressed air passes through the carbon dioxide filter 102 to remove carbon dioxide, through the moisture filter 103 to remove moisture, and through the oil vapor filter 104 to remove oil vapor, resulting in clean compressed air, which is then temporarily stored in the gas storage tank 8. The equipment control module controls the cooling device to cool the compressed air. The temperature and humidity sensor 4 measures the temperature and humidity of the compressed air in real time and feeds it back to the main control module for calculation and judgment.

[0072] Step S2: Adsorption oxygen generation process; When the temperature and humidity of the compressed air meet the system requirements (e.g., temperature of 25°C and humidity of less than 10% water content), the main control module starts the adsorption oxygen generation stage.

[0073] (1) Single-effect oxygen generation process; The equipment control module controls the opening of the first adsorber A in the first oxygen generation system (which can also be the second adsorber B in the first oxygen generation system, the first adsorber A in the second oxygen generation system, or the second adsorber B in the second oxygen generation system). The valve control module controls the opening of solenoid valve 45 and valve 42, and simultaneously controls the closing of solenoid valve 18, solenoid valve 21, and other solenoid valves in the pipeline system 6. The tank control module controls the gas storage tank 8 and oxygen storage tank 11 to open sequentially. Compressed air enters the first adsorber A after passing through the main pipeline 5, the sixteenth gas pipe 46, the eighth gas pipe 36, and the ninth gas pipe 37. Nitrogen is efficiently adsorbed by the molecular sieve in the first adsorber A. The obtained oxygen is collected into the oxygen storage tank 11 through the tenth gas pipe 38, the twelfth gas pipe 40, and the fifteenth gas pipe 43. When a certain amount of oxygen is stored in the oxygen storage tank 11, the main control module controls each module to stop working to stop oxygen production. At this time, the valve control module is restarted to open the oxygen storage tank valve 10, and the concentration detection control module is restarted to open the oxygen concentration detector 12. The oxygen in the oxygen storage tank 11 passes through pipes 3 13, 4 14, 9 23, 8 22, and 10 25 in sequence to reach pipe 11 26. The oxygen concentration detector 12 measures the oxygen concentration in real time and feeds it back to the main control module for calculation and judgment. When the oxygen concentration is detected to be below the system requirement (e.g., oxygen concentration greater than or equal to 99.5%), the oxygen purity is unqualified. At this time, the connector of pipe 11 26 is connected to solenoid valve 2 21, the valve control module is restarted to open solenoid valve 2 21, and the tank control module is restarted to open the oxygen storage tank 11. The oxygen is reintroduced into the first adsorber A through pipe 7 20 for secondary nitrogen adsorption. The obtained oxygen is collected back into the oxygen storage tank 11. The oxygen concentration detector 12 measures the oxygen concentration in real time until the oxygen concentration reaches the system requirement. Then, the valve control module is activated to close solenoid valve 2 21, completing the single-effect oxygen generation process. At this point, the connector of pipe 1126 can be connected to an external oxygen supply device. During the single-effect oxygen generation process and the oxygen supply process, the flow measurement and control module controls the flow meter 15 to turn on. The flow meter 15 measures the oxygen flow rate in real time and feeds it back to the main control module for calculation and judgment.

[0074] (2) Dual-effect oxygen generation process; The equipment control module controls the simultaneous opening of the first adsorber A and the second adsorber B in the first oxygen generation system (or the first adsorber A and the second adsorber B in the second oxygen generation system). The valve control module controls the opening of solenoid valves 6-45, 3-28, and 42. Referring to the single-effect oxygen generation method, oxygen is collected into the oxygen storage tank 11. The oxygen concentration detector 12 measures the oxygen concentration in real time and feeds it back to the main control module for calculation and judgment. When the oxygen concentration is detected to be below the system requirement (e.g., oxygen concentration greater than or equal to 99.5%), the oxygen purity is considered to be insufficient. If the oxygen supply fails to meet the requirements, the connector of pipe 11 (26) is connected to solenoid valve 2 (21). The valve control module controls solenoid valve 2 (21) and solenoid valve 1 (18) to open, allowing oxygen to be reintroduced into the first adsorber A via pipe 7 (20) and into the second adsorber B via pipes 6 (19) and 5 (17) for secondary nitrogen adsorption. The resulting oxygen is then collected back into the oxygen storage tank 11. The oxygen concentration detector 12 measures the oxygen concentration in real time until it reaches the system requirements. At this point, the valve control module controls solenoid valve 2 (21) and solenoid valve 1 (18) to close, completing the double-effect oxygen generation process. At this point, the connector of pipe 11 (26) can be connected to an external oxygen supply device. During the double-effect oxygen generation and oxygen supply processes, the flow measurement control module controls flow meter 1 (15) to open. Flow meter 1 (15) measures the oxygen flow rate in real time and feeds it back to the main control module for calculation and judgment.

[0075] (3) Triple-effect oxygen generation process; The equipment control module controls the activation of the first adsorber A and the second adsorber B in the first oxygen generation system, and either the first adsorber A or the second adsorber B in the second oxygen generation system, to perform triple-effect oxygen generation, referring to the single-effect and double-effect oxygen generation methods. During triple-effect oxygen generation and oxygen supply, the flow measurement control module controls the activation of flow meter 15 and flow meter 24. Flow meter 15 in both oxygen generation systems measures the oxygen flow rate of the two branches in real time and feeds it back to the main control module for calculation and judgment. Flow meter 24 measures the total oxygen flow rate in real time and feeds it back to the main control module for calculation and judgment.

[0076] (4) Four-effect oxygen generation process; The equipment control module controls the simultaneous activation of the first adsorber A and the second adsorber B in the first oxygen generation system and the first adsorber A and the second adsorber B in the second oxygen generation system, performing four-effect oxygen generation by referring to the single-effect, double-effect, and triple-effect oxygen generation methods. During the four-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the activation of flow meter 15 and flow meter 24. Flow meter 15 in both oxygen generation systems measures the oxygen flow rate of the two branches in real time and feeds it back to the main control module for calculation and judgment. Flow meter 24 measures the total oxygen flow rate in real time and feeds it back to the main control module for calculation and judgment.

[0077] Step S4: Desorption and regeneration process; Taking the single-effect oxygen generation method (1) in the adsorption oxygen generation stage as an example, the equipment control module controls the vacuum pump 16 to start and vacuum the first adsorber A to reduce the pressure. During the desorption and regeneration process, the sensor control module controls the vacuum pressure sensor to turn on. The vacuum pressure sensor measures the pressure in the first adsorber A in real time and feeds it back to the main control module for calculation and judgment. When the pressure reaches the system requirements (e.g., 0.35MPa-0.8MPa), the equipment control module controls the vacuum pump 16 to turn off, the valve control module controls the solenoid valve 44 to turn on, and the tank control module controls the gas storage tank 8 to turn on. The nitrogen desorbed in the first adsorber A enters the gas storage tank 8 sequentially through the tenth gas pipe 38, the eleventh gas pipe 39, the thirteenth gas pipe 41, the eighth gas pipe 36, the sixteenth gas pipe 46, and the main pipeline 5. At the same time, the nitrogen in the first adsorber A also enters the gas storage tank 8 sequentially through the ninth gas pipe 37, the eighth gas pipe 36, the sixteenth gas pipe 46, and the main pipeline 5. When it is necessary to remove nitrogen, the nitrogen outlet valve of the gas storage tank 8 can be opened to remove nitrogen through the nitrogen outlet of the air pretreatment tank 1 via the second pipeline 9.

[0078] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to facilitate the description of this invention and to simplify the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting the scope of protection of this invention.

[0079] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. However, these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A molecular sieve oxygen generator, characterized in that, include: Two identical oxygen generation systems are constructed. Each system includes: an air pretreatment tank with a nitrogen vent; an air compressor, a temperature and humidity sensor, and a gas storage tank mounted on the air pretreatment tank; a piping system connected to the gas storage tank via a main pipeline; a first and second adsorber connected to the piping system; a pipe (seven) connected to the first adsorber; a pipe (six) connected to pipe seven; a solenoid valve (two) installed between pipes seven and six; a pipe (five) connected to the second adsorber; a pipe (six) connected to pipe five; a solenoid valve (one) installed between pipes five and six; an oxygen storage tank mounted on the first and second adsorbers; an oxygen storage tank valve mounted on the oxygen storage tank; a pipe (three) connected to the oxygen storage tank valve; an oxygen concentration detector mounted on pipe three; a pipe (four) connected to pipe three; and a flow meter mounted on pipe four.

1. Pipe 9, connected to pipe 4, is equipped with a vacuum pump installed on the first and second adsorbers for evacuating the first and second adsorbers. A vacuum pressure sensor is also installed on the first and second adsorbers to measure the internal vacuum level. Molecular sieves are installed in the first and second adsorbers. The air pretreatment tank contains a compressed air storage tank, a carbon dioxide filter, a moisture filter, and an oil vapor filter. The measuring end of the air compressor extends into the compressed air storage tank. The measuring end of the temperature and humidity sensor extends into the gas storage tank. The gas storage tank is connected to the outlet of the oil vapor filter via pipe 1. The gas storage tank has a nitrogen outlet valve, which is connected to the nitrogen exhaust port of the air pretreatment tank via pipe 2. Pipe 9 in both oxygen generation systems is connected to pipe 8.

2. The molecular sieve oxygen generator according to claim 1, characterized in that, The gas storage tank is equipped with a cooling device to cool the pre-treated compressed air to room temperature.

3. The molecular sieve oxygen generator according to claim 1, characterized in that, The compressed air storage tank, carbon dioxide filter, moisture filter, and oil vapor filter are connected in sequence via pipes and solenoid valves.

4. The molecular sieve oxygen generator according to claim 1, characterized in that, Pipe 8 is connected to pipe 10, pipe 10 is connected to pipe 11, and flow meter 2 is installed on pipe 10.

5. The molecular sieve oxygen generator according to claim 1, characterized in that, It also includes an electrical control box, which houses the control system.

6. The molecular sieve oxygen generator according to claim 1, characterized in that, The piping system consists of a first air pipe, solenoid valve three, solenoid valve four, a second air pipe, a third air pipe, a fourth air pipe, a fifth air pipe, a sixth air pipe, a seventh air pipe, an eighth air pipe, a ninth air pipe, a tenth air pipe, an eleventh air pipe, a twelfth air pipe, a thirteenth air pipe, a valve, a fifteenth air pipe, solenoid valve five, solenoid valve six, and a sixteenth air pipe. The lower end of the main pipe is connected to the first air pipe and the sixteenth air pipe via pipe connectors. Solenoid valve three is installed on the first air pipe. The first air pipe connects to the third air pipe. The third air pipe is connected to the second air pipe and the sixth air pipe via pipe connectors. The second air pipe is connected to the fourth air pipe. The second air pipe connects to the sixth air pipe. A solenoid valve four is installed between the four air pipes. The fourth air pipe is connected to the fifth and seventh air pipes respectively through pipe connectors. A solenoid valve six is ​​installed on the sixteenth air pipe. The sixteenth air pipe is connected to the eighth air pipe. The eighth air pipe is connected to the thirteenth and ninth air pipes respectively through pipe connectors. The thirteenth air pipe is connected to the eleventh air pipe. A solenoid valve five is installed between the thirteenth and eleventh air pipes. The eleventh air pipe is connected to the twelfth air pipe respectively through pipe connectors. The seventh, twelfth, and fifteenth air pipes are connected through pipe connectors. The valve is installed on the fifteenth air pipe.

7. The molecular sieve oxygen generator according to claim 1, characterized in that, The molecular sieve is prepared as follows: (1) Weigh NaY zeolite and ZSM-5 zeolite according to the mass ratio of (1-2): (3-5), mix them evenly, calcine them at high temperature and then cool them. Finally, pulverize them to 80-100 mesh to obtain mixed powder. (2) Weigh out raptosite, montmorillonite and dickite in a mass ratio of (0.3-0.5):(0.5-0.9):(0.6-0.8), mix them evenly and then pulverize them to 80-100 mesh. Then add lithium magnesium silicate, the amount of which is 1%-5% of the total amount of raptosite, montmorillonite and dickite. Heat at 90℃-110℃ for 30min-1h, and then disperse, filter and dry the mixture in polyvinyl alcohol to obtain mixed powder II. (3) Weigh mixed powder one and mixed powder two according to the mass ratio of (1-2): (0.1-0.3). After mixing evenly, add crystallization guide agent and react at 90℃-110℃ for 16h-24h. Finally, after drying, grinding and sieving, a preliminary molecular sieve is obtained. Then, it is added to lithium borohydride solution and soaked for 1.5h-3h to obtain the final molecular sieve.

8. The molecular sieve oxygen generator according to claim 7, characterized in that, The preparation method of the crystallization directing agent is as follows: The sodium aluminate solution and water glass were heated to 30℃-35℃ respectively. The sodium aluminate solution was added to the water glass under strong stirring. The volume ratio of sodium aluminate solution to water glass was (0.15-0.35):(0.5-1.5). After stirring for 10min-15min, the mixture was placed in a constant temperature environment of 30℃-35℃ for 20h-30h to prepare a crystallization guiding agent.

9. The control system of a molecular sieve oxygen generator as described in any one of claims 1-8, characterized in that, include: The main control module is used to coordinate the operation of the equipment control module, tank control module, valve control module, sensor control module, flow measurement control module, and concentration detection control module, and comprehensively control the entire process of molecular sieve oxygen production. The main control module uses a built-in comparison algorithm to calculate and compare the pressure, temperature and humidity of the compressed air in the compressed air storage tank, the oxygen concentration and flow rate in the oxygen storage tank, and the pressure in the first and second adsorbers with the system settings. The equipment control module is used to control the opening and closing times of the cooling devices in the carbon dioxide filter, moisture filter, oil vapor filter, air compressor, vacuum pump, first adsorber, second adsorber, and gas storage tank; The tank control module is used to control the opening and closing times of the compressed air storage tank, gas storage tank, and oxygen storage tank. The valve control module is used to control the opening and closing times of solenoid valves 1, 2, 3, 4, 5, and 6, as well as the valves of the oxygen storage tank. The sensor control module is used to strictly control the on and off times of the air compressor, temperature and humidity sensor, and vacuum pressure sensor. The flow measurement and control module is used to control the opening and closing times of flow meter 1 and flow meter 2; The concentration detection and control module is used to control the on and off times of the oxygen concentration detector.

10. A control method for a molecular sieve oxygen generator as described in any one of claims 1-8, characterized in that, Includes the following steps: Step S1: Air compression process; The equipment control module controls the air compressor to start, the air compressor compresses the outside air and stores the compressed air in the compressed air storage tank, and the sensor control module controls the air compressor to measure the pressure of the compressed air in real time and feed it back to the main control module for calculation and judgment. Step S2: Compressed air pretreatment; When the compressed air pressure reaches the system requirements, the main control module starts the compressed air pretreatment stage; the tank control module controls the compressed air temporary storage tank and gas storage tank to open in sequence, the equipment control module controls the carbon dioxide filter, moisture filter and oil vapor filter to open in sequence, and the sensor control module controls the temperature and humidity sensor to open; the compressed air passes through the carbon dioxide filter to remove carbon dioxide, through the moisture filter to remove moisture, and through the oil vapor filter to remove oil vapor, resulting in clean compressed air, which is temporarily stored in the gas storage tank. The equipment control module controls the cooling device to cool it, and the temperature and humidity sensor measures the temperature and humidity of the compressed air in real time and feeds it back to the main control module for calculation and judgment. Step S2: Adsorption oxygen generation process; When the temperature and humidity of the compressed air meet the system requirements, the main control module starts the adsorption oxygen generation stage. (1) Single-effect oxygen generation process; The equipment control module controls the opening of the first adsorber in the first oxygen generation system. The valve control module controls the opening of solenoid valve six and valve two, while simultaneously controlling the closing of solenoid valve one, solenoid valve two, and other solenoid valves in the pipeline system. The tank control module controls the sequential opening of the gas storage tank and oxygen storage tank. Compressed air sequentially passes through the main pipeline, the sixteenth gas pipe, the eighth gas pipe, and the ninth gas pipe before entering the first adsorber. Nitrogen is efficiently adsorbed by the molecular sieve in the first adsorber, and the resulting oxygen is collected sequentially through the tenth, twelfth, and fifteenth gas pipes into the oxygen storage tank. When a certain amount of oxygen is stored in the oxygen storage tank, the main control module controls all modules to pause operation to stop oxygen generation. At this time, the valve control module is restarted to open the oxygen storage tank valve, and the concentration detection control module is restarted to turn on the oxygen concentration detector. This allows the oxygen in the oxygen storage tank to sequentially pass through pipelines three, four, nine, eight, and ten before reaching pipeline eleven. The oxygen concentration detector measures the oxygen concentration in real time and feeds it back to the main control module. The module performs calculations and judgments. When it detects that the oxygen concentration does not meet the system requirements, the oxygen purity is unqualified. At this time, the connector of pipe eleven is connected to solenoid valve two, the valve control module is restarted to control solenoid valve two to open, and the tank control module is restarted to control the oxygen storage tank to open. The oxygen is reintroduced into the first adsorber through pipe seven for secondary nitrogen adsorption. The obtained oxygen is collected again in the oxygen storage tank. The oxygen concentration detector measures the oxygen concentration in real time until the oxygen concentration meets the system requirements. Then, the valve control module is activated to control solenoid valve two to close, completing the single-effect oxygen generation process. At this time, the connector of pipe eleven is connected to the external oxygen-using equipment to supply oxygen. During the single-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the flow meter one to open. The flow meter one measures the oxygen flow in real time and feeds it back to the main control module for calculation and judgment. The above process is the same when using the second adsorber in the first oxygen generation system, the first adsorber in the second oxygen generation system, or the second adsorber in the second oxygen generation system for single-effect oxygen generation. (2) Dual-effect oxygen generation process; The equipment control module controls the simultaneous opening of the first and second adsorbers in the first oxygen generation system, or the simultaneous opening of the first and second adsorbers in the second oxygen generation system. The valve control module controls the opening of solenoid valves six and three, and valve one. Referring to the single-effect oxygen generation method, oxygen is collected into the oxygen storage tank. The oxygen concentration detector measures the oxygen concentration in real time and feeds it back to the main control module for calculation and judgment. When the oxygen concentration is found to be below the system requirements, the oxygen purity is considered unqualified. At this time, the joint of pipe eleven is connected to solenoid valve two, and the valve control module controls the opening of solenoid valves two and one, distributing the oxygen. The oxygen is reintroduced into the first adsorber via pipe seven and into the second adsorber via pipes six and five for secondary nitrogen adsorption. The resulting oxygen is then collected in the oxygen storage tank. The oxygen concentration detector measures the oxygen concentration in real time until it reaches the system requirements. At this point, the valve control module controls solenoid valves two and one to close, completing the double-effect oxygen generation process. Meanwhile, the oxygen supply equipment is connected to the connector of pipe eleven. During the double-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls flow meter one to open. Flow meter one measures the oxygen flow rate in real time and feeds it back to the main control module for calculation and judgment. (3) Triple-effect oxygen generation process; The equipment control module controls the first and second adsorbers in the first oxygen generation system and the first or second adsorber in the second oxygen generation system to start, and performs triple-effect oxygen generation with reference to the single-effect oxygen generation method and the double-effect oxygen generation method. During the triple-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the flow meter one and flow meter two to start. Flow meter one in the two oxygen generation systems measures the oxygen flow of the two branches in real time and feeds it back to the main control module for calculation and judgment. Flow meter two measures the total oxygen flow in real time and feeds it back to the main control module for calculation and judgment. (4) Four-effect oxygen generation process; The equipment control module controls the first and second adsorbers in the first oxygen generation system and the first and second adsorbers in the second oxygen generation system to be turned on simultaneously, and performs four-effect oxygen generation by referring to the single-effect oxygen generation method, the double-effect oxygen generation method, and the triple-effect oxygen generation method. During the four-effect oxygen generation process and the oxygen supply process, the flow measurement control module controls the flow meter one and flow meter two to be turned on. Flow meter one in the two oxygen generation systems measures the oxygen flow of the two branches in real time and feeds it back to the main control module for calculation and judgment. Flow meter two measures the total oxygen flow in real time and feeds it back to the main control module for calculation and judgment. Step S4: Desorption and regeneration process; Taking the single-effect oxygen generation method (1) in the adsorption oxygen generation stage as an example, the equipment control module controls the vacuum pump to turn on and vacuum the first adsorber to reduce the pressure. During the desorption and regeneration process, the sensor control module controls the vacuum pressure sensor to turn on. The vacuum pressure sensor measures the pressure in the first adsorber in real time and feeds it back to the main control module for calculation and judgment. When the pressure reaches the system requirements, the equipment control module controls the vacuum pump to turn off, the valve control module controls the solenoid valve five to turn on, and the tank control module controls the gas storage tank to turn on. The nitrogen desorbed in the first adsorber enters the gas storage tank in sequence through the tenth gas pipe, the eleventh gas pipe, the thirteenth gas pipe, the eighth gas pipe, the sixteenth gas pipe, and the main pipeline. At the same time, the nitrogen in the first adsorber also enters the gas storage tank in sequence through the ninth gas pipe, the eighth gas pipe, the sixteenth gas pipe, and the main pipeline. When it is necessary to remove nitrogen, the nitrogen outlet valve of the gas storage tank is opened, and the nitrogen is removed through the second pipeline and the nitrogen outlet of the air pretreatment tank.

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