Oxygen generation system and oxygen concentration rapid increasing method

Abstract

The invention provides an oxygen generation system and a rapid oxygen concentration increasing method. The oxygen generation system comprises air pretreatment equipment, a first-stage oxygen generation module and a second-stage oxygen generation module which are connected in sequence; the method comprises the steps that the first-stage oxygen generation module starts to be started from a pressure equalizing stage, and the second-stage oxygen generation module starts to be started from an air inlet stage. The system has the advantages that the oxygen increasing speed of the oxygen generation system is high; and less unqualified oxygen is generated during oxygen production, so that energy is saved.

Description

Technical Field

[0001] The present application belongs to the technical field of oxygen production, and specifically relates to an oxygen production system and a method for rapidly increasing oxygen concentration. Background Art

[0002] In the existing oxygen production system, the principle of oxygen production with an oxygen concentration of 99.5% is as follows: air compression and air pretreatment equipment provide clean and dry compressed air as raw gas and instrument air for separation. Then it is separated by two-stage pressure swing adsorption: the first-stage adsorption separator mainly removes nitrogen and a small amount of argon to produce enriched oxygen with a concentration of about 93%, and the second-stage adsorption separator removes the argon in the enriched oxygen with a concentration of about 93% produced in the previous stage, and outputs it as qualified oxygen through process circulation and booster. In the process, in order to obtain higher efficiency, the process circulation compressor can continuously pressurize the intermediate process gas again and return it to the adsorption separator for purification, which effectively improves the total recovery rate of adsorption separation and achieves the purpose of efficiently producing oxygen with a concentration of 99.5%.

[0003] The steps of producing oxygen with a concentration of 99.5% using an existing oxygen production device generally include:

[0004] Step 1: Start the cold dryer for 60 seconds, then start the air compressor for 30 seconds, and then start the first-stage oxygen production module. Start the first-stage oxygen production module randomly, starting at the step where it was paused last time;

[0005] Step 2: When starting the first stage of oxygen production, start the second stage of oxygen production module synchronously. The second stage of oxygen production module starts randomly. The circulation compressor, oxygen booster and other components will be started at the same step where it was paused last time.

[0006] The existing oxygen production has the following defects:

[0007] 1. The oxygen concentration increases slowly, the oxygen production balance is difficult to establish, and the hospital's requirements cannot be responded to in time;

[0008] 2. When producing oxygen, unqualified oxygen will continue to be produced and discharged into the atmosphere, wasting energy;

[0009] 3. The entire oxygen production process takes about 20 minutes from startup to oxygen concentration reaching the standard, and the startup time is too long. Summary of the invention

[0010] The purpose of this application is to overcome the defect of slow increase in oxygen concentration.

[0011] In order to achieve the above objectives, the present application proposes an oxygen production system, comprising:

[0012] The air pretreatment equipment, the first-stage oxygen production module and the second-stage oxygen production module are connected in sequence;

[0013] The air pretreatment equipment comprises: an air compressor, an air-water separator, a cold dryer, a first filter, an air buffer tank, a second filter and an instrument air tank connected in sequence by pipelines;

[0014] The first-stage oxygen production module includes:

[0015] The first adsorption tower, the second adsorption tower, the first-stage buffer tank, and the first air release valve;

[0016] a first shuttle valve, a first connection end of which is connected to the instrument gas tank, and a second connection end of which is connected to the inlet of the first adsorption tower;

[0017] a second shuttle valve, a first connecting end of which is connected to the second connecting end of the first shuttle valve and the inlet of the first adsorption tower, and a second connecting end of which is connected to the first air release valve;

[0018] a twelfth shuttle valve, a first connection end of which is connected to the instrument gas tank, and a second connection end of which is connected to the inlet of the second adsorption tower;

[0019] a thirteenth shuttle valve, a first connection end of which is connected to the second connection end of the twelfth shuttle valve and the inlet of the second adsorption tower, and a second connection end of which is connected to the first air release valve;

[0020] a third shuttle valve, a first connection end of which is connected to the second connection end of the twelfth shuttle valve and the inlet of the second adsorption tower, and a second connection end of which is connected to the outlet of the first adsorption tower;

[0021] a fourteenth shuttle valve, a first connecting end of which is connected to the second connecting end of the first shuttle valve and the inlet of the first adsorption tower, and a second connecting end of which is connected to the outlet of the second adsorption tower;

[0022] a fourth shuttle valve, a first connection end of which is connected to the outlet of the first adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank;

[0023] a fifteenth shuttle valve, a first connection end of which is connected to the outlet of the second adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank;

[0024] a fifth shuttle valve, a first connection end of which is connected to the outlet of the first adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank; and

[0025] a sixteenth shuttle valve, a first connection end of which is connected to the outlet of the second adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank;

[0026] The second-stage oxygen production module includes:

[0027] The third adsorption tower, the fourth adsorption tower, the second air release valve, the circulating compressor, and the second-stage buffer tank;

[0028] a sixth shuttle valve, a first connection end of which is connected to the outlet of the first-stage buffer tank, and a second connection end of which is connected to the inlet of the third adsorption tower;

[0029] A seventeenth shuttle valve, a first connection end of which is connected to the outlet of the first-stage buffer tank, and a second connection end of which is connected to the fourth adsorption tower;

[0030] a seventh shuttle valve, a first connection end of which is connected to the second connection end of the sixth shuttle valve and the inlet of the third adsorption tower, and a second connection end of which is connected to the inlet of the circulating compressor;

[0031] An eighteenth shuttle valve, a first connection end of which is connected to the second connection end of the seventeenth shuttle valve and the inlet of the fourth adsorption tower, and a second connection end of which is connected to the inlet of the circulation compressor;

[0032] an eighth shuttle valve, a first connection end of which is connected to the first connection end of the seventh shuttle valve, and a second connection end of which is connected to the outlet of the circulating compressor;

[0033] a nineteenth shuttle valve, a first connection end of which is connected to the first connection end of the eighteenth shuttle valve, and a second connection end of which is connected to the outlet of the circulating compressor;

[0034] a ninth shuttle valve, a first connection end of which is connected to the inlet of the third adsorption tower, and a second connection end of which is connected to the outlet of the fourth adsorption tower;

[0035] a twentieth shuttle valve, a first connection end of which is connected to the inlet of the fourth adsorption tower, and a second connection end of which is connected to the outlet of the third adsorption tower;

[0036] a tenth shuttle valve, a first connection end of which is connected to the outlet of the third adsorption tower, and a second connection end of which is connected to the second air release valve;

[0037] a twenty-first shuttle valve, a first connecting end of which is connected to the outlet of the fourth adsorption tower, and a second connecting end of which is connected to the second air release valve;

[0038] an eleventh shuttle valve, a first connection end of which is connected to the inlet of the circulating compressor, and a second connection end of which is connected to the inlet of the second buffer tank; and

[0039] A twenty-second shuttle valve has a first connection end connected to the outlet of the circulating compressor, and a second connection end connected to the inlet of the second-stage buffer tank.

[0040] As an improvement to the above system, various components of the system are connected by stainless steel pipes.

[0041] The present application also provides a method for rapidly increasing oxygen concentration, which is implemented based on the above oxygen production system, and the method comprises:

[0042] The steps of starting and operating the oxygen production system include:

[0043] The first step is to start the cold dryer to make the air temperature reach the set temperature;

[0044] The second step is to start the air compressor to make the pressure of the air buffer tank reach a first set pressure;

[0045] The third step is to start the first-stage oxygen production module;

[0046] Step 4: when the third adsorption tower was running when the second-stage oxygen production module was stopped last time, the sixth shuttle valve and the tenth shuttle valve are opened; when the fourth adsorption tower was stopped last time when the second-stage oxygen production module was stopped, the seventeenth shuttle valve and the twenty-first shuttle valve are opened to discharge the oxygen generated by the first-stage oxygen production module; when the pressure of the first-stage buffer tank is stabilized at the second set pressure, and the oxygen concentration generated by the first-stage oxygen production module reaches the first set concentration and is in a stable state, the second-stage oxygen production module is started;

[0047] Step 5: After the second-stage oxygen production module starts for the first set time, the circulation compressor is started to start the second-stage oxygen production;

[0048] Step 6. When the oxygen concentration is less than the second set concentration, the unqualified gas is discharged. When the oxygen concentration is greater than the second set concentration, the oxygen enters the second-stage buffer tank through the circulation compressor.

[0049] As an improvement of the above method, the operation of the first-stage oxygen production module is a continuous cycle process, including two half cycles, one half cycle is the first adsorption tower oxygen production cycle, and the other half cycle is the second adsorption tower oxygen production cycle;

[0050] The first adsorption tower oxygen production cycle includes:

[0051] A1: Open the third shuttle valve and close the other shuttle valves of the first-stage oxygen production module;

[0052] A2: Open the second shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0053] A3: Open the twelfth shuttle valve, the second shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0054] A4: Open the twelfth shuttle valve, the second shuttle valve and the fifteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0055] A5: Open the twelfth shuttle valve, the second shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0056] A6: Open the twelfth shuttle valve, the second shuttle valve and the fifteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0057] A7: Open the twelfth shuttle valve, the second shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0058] A8: Open the twelfth shuttle valve, the second shuttle valve and the fifteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0059] A9: Open the twelfth shuttle valve, the second shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0060] A10: Open the twelfth shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0061] The second adsorption tower oxygen production cycle includes:

[0062] B1: Open the fourteenth shuttle valve and close the other shuttle valves of the first-stage oxygen production module;

[0063] B2: Open the thirteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0064] B3: Open the first shuttle valve, the thirteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0065] B4: Open the first shuttle valve, the thirteenth shuttle valve and the fourth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0066] B5: Open the first shuttle valve, the thirteenth shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0067] B6: Open the first shuttle valve, the thirteenth shuttle valve and the fourth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0068] B7: Open the first shuttle valve, the thirteenth shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0069] B8: Open the first shuttle valve, the thirteenth shuttle valve and the fourth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0070] B9: Open the first shuttle valve, the thirteenth shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module;

[0071] B10: Open the first shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module.

[0072] As an improvement of the above method, the first adsorption tower oxygen production cycle and the second adsorption tower oxygen production cycle can be started from any step.

[0073] As an improvement of the above method, the oxygen production cycle of the first adsorption tower is started from step A1; the oxygen production cycle of the second adsorption tower is started from step B1.

[0074] As an improvement of the above method, the operation of the second-stage oxygen production module is a continuous cycle process, including two half cycles, one half cycle is the oxygen production cycle of the third adsorption tower, and the other half cycle is the oxygen production cycle of the fourth adsorption tower;

[0075] The third adsorption tower oxygen production cycle includes:

[0076] C1: Open the sixth shuttle valve, the eighteenth shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0077] C2: open the 18th shuttle valve, the 8th shuttle valve, the 10th shuttle valve and the 22nd shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0078] C3: Open the eighth shuttle valve, the tenth shuttle valve and the eleventh shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0079] C4: Open the 20th shuttle valve, the 11th shuttle valve and the 22nd shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0080] The fourth adsorption tower oxygen production cycle includes:

[0081] D1: Open the seventeenth shuttle valve, the seventh shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0082] D2: Open the seventh shuttle valve, the nineteenth shuttle valve, the twenty-first shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0083] D3: Open the 19th shuttle valve, the 21st shuttle valve and the 11th shuttle valve, and close the other shuttle valves of the second-stage oxygen production module;

[0084] D4: Open the ninth shuttle valve, the eleventh shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module.

[0085] As an improvement of the above method, the oxygen production cycle of the third adsorption tower is started from step C1; the oxygen production cycle of the fourth adsorption tower is started from step D1.

[0086] As an improvement of the above method, the method further comprises:

[0087] The shut down step of the oxygen production system comprises:

[0088] When the oxygen production system enters the standby state, first turn off the second-stage oxygen production module, turn off the circulating compressor, and stop the second-stage oxygen production module at step C1 or D1; then turn off the first-stage oxygen production module, and stop the first-stage oxygen production module at step A1 or B1; then turn off the air compressor, and turn off the cold dryer after a third set time delay.

[0089] As an improvement of the above method, the set temperature is -0.7°C-2°C, the first set pressure is 0.6Mpa-0.7Mpa, and the second set pressure is 0.5Mpa-0.6Mpa.

[0090] Compared with the prior art, the advantages of this application are:

[0091] 1. The oxygen production system has a fast oxygen increase speed;

[0092] 2. Less unqualified oxygen is produced during oxygen production, saving energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0093] Figure 1 Shown is the schematic diagram of the oxygen concentrator. DETAILED DESCRIPTION

[0094] The technical solution of the present application is described in detail below with reference to the accompanying drawings.

[0095] like Figure 1 As shown, it is an oxygen production principle diagram of the oxygen production system related to the present application, and the oxygen production system includes: an air pretreatment device, a first-stage oxygen production module and a second-stage oxygen production module connected in sequence.

[0096] The air pretreatment equipment may include: an air compressor 1, an air-water separator 2, a cold dryer 3, a first filter 4, an air buffer tank 5, a second filter 6 and an instrument air tank 7 which are sequentially connected by stainless steel pipes.

[0097] The air compressor 1 is used to provide compressed air for the entire oxygen production system and serves as an air source component.

[0098] The air-water separator 2 is used to separate most of the water contained in the compressed air.

[0099] The cold dryer 3, whose full name is freeze dryer, is used to reduce the temperature of compressed air and remove some moisture from the air.

[0100] The first filter 4 and the second filter 6 are used to remove oil and water impurities, odors, etc. in the air or to remove odorous dust, etc. in the produced oxygen.

[0101] The air buffer tank 5, as a buffer tank for storing air, enables the system to obtain stable compressed air.

[0102] Instrument gas tank 7: provides control gas for the pneumatic components of the entire system, namely the shuttle valve.

[0103] The pipeline after the instrument gas tank 7 can be divided into two branches, the first branch can be connected to the inlet of the first adsorption tower 8 after passing through the first shuttle valve 01A, and the second branch can be connected to the inlet of the second adsorption tower 9 after passing through the twelfth shuttle valve 01B. There can be two branches between the first shuttle valve 01A and the inlet of the first adsorption tower 8, the first branch can be connected to the first air release valve 15 after passing through the second shuttle valve 02A, and the second branch can be connected to the outlet of the second adsorption tower 9 after passing through the fourteenth shuttle valve 03B. There can be two branches between the twelfth shuttle valve 01B and the inlet of the second adsorption tower 9, the first branch can be connected to the first air release valve 15 after passing through the thirteenth shuttle valve 02B, and the second branch can be connected to the outlet of the first adsorption tower 8 after passing through the third shuttle valve 03A. The outlet pipe of the first adsorption tower 8 can be connected to the inlet of the fourth shuttle valve 04A, the outlet pipe of the second adsorption tower 9 can be connected to the inlet of the fifteenth shuttle valve 04B, the outlet pipe of the fourth shuttle valve 04A can be connected to the inlet of the first-stage buffer tank 10 after merging with the outlet pipe of the fifteenth shuttle valve 04B. The outlet pipe of the first adsorption tower 8 can also be connected to the inlet of the fifth shuttle valve 05A, the outlet pipe of the second adsorption tower 9 can also be connected to the inlet of the sixteenth shuttle valve 05B, the outlet pipe of the fifth shuttle valve 05A can be connected to the inlet of the first-stage buffer tank 10 after merging with the outlet pipe of the sixteenth shuttle valve 05B. The above-mentioned first adsorption tower 8, the second adsorption tower 9, the shuttle valves connected to them, the first air release valve 15 and the first-stage buffer tank 10 can together constitute a first-stage oxygen production module.

[0104] The outlet pipeline of the first buffer tank 10 can be divided into two branches, the first branch can be connected to the inlet of the third adsorption tower 11 after the sixth shuttle valve 06A, and the second branch can be connected to the inlet of the fourth adsorption tower 12 after the seventeenth shuttle valve 06B. The pipeline between the sixth shuttle valve 06A and the inlet of the third adsorption tower 11 can have three branches, the first branch can be connected to the outlet of the fourth adsorption tower 12 after the ninth shuttle valve 09A; the second branch can be connected to the inlet of the eighth shuttle valve 08A; the third branch can be connected to the inlet of the seventh shuttle valve 07A. The pipeline between the seventeenth shuttle valve 07B and the inlet of the fourth adsorption tower 12 can have three branches, the first branch can be connected to the outlet of the third adsorption tower 11 after the twentieth shuttle valve 09B; the second branch can be connected to the inlet of the nineteenth shuttle valve 08B; the third branch can be connected to the inlet of the eighteenth shuttle valve 07B. The outlet of the third adsorption tower 11 can be connected to the inlet of the tenth shuttle valve 10A. The outlet of the fourth adsorption tower 12 can be connected to the inlet of the twenty-first shuttle valve 10B. The outlet pipeline of the tenth shuttle valve 10A can be connected to the second air release valve 16 after merging with the outlet pipeline of the twenty-first shuttle valve 10B. The outlet pipeline of the seventh shuttle valve 07A can be divided into two branches after merging with the outlet pipeline of the eighteenth shuttle valve 07B, the first branch can be connected to the inlet of the eleventh shuttle valve 11A, and the second branch can be connected to the inlet of the circulation compressor 14. The outlet pipeline of the circulation compressor 14 can be connected to the inlet of the twenty-second shuttle valve 11B. The outlet pipeline of the twenty-second shuttle valve 11B can be connected to the inlet of the second-stage buffer tank 13 after merging with the outlet pipeline of the eleventh shuttle valve 11A. The outlet pipeline of the eighth shuttle valve 08A can be connected to the inlet of the twenty-second shuttle valve 11B after merging with the outlet pipeline of the nineteenth shuttle valve 08B. The third adsorption tower 11, the fourth adsorption tower 12 and the shuttle valves, the second air release valve 16, the circulation compressor 14 and the second-stage buffer tank 13 described above can together constitute the second-stage oxygen production module.

[0105] The circulating booster 14 is used to compress the oxygen so that the oxygen enters the second-stage buffer tank 13 in a pressurized state.

[0106] The components in the oxygen production system are connected through stainless steel pipes and unions. Unions are connectors that connect the two ends of stainless steel pipes. The interface of each component can be threaded and then welded through stainless steel pipes.

[0107] The method for rapidly increasing oxygen concentration provided in the present application is implemented based on the above oxygen production system and may include:

[0108] The first step is to start the cold dryer 3 to make the air temperature reach -0.7°C to 2°C, preferably 0.7°C.

[0109] The second step is to start the air compressor 1 to make the pressure of the air buffer tank 5 reach 0.6Mpa-0.7Mpa, preferably 0.65Mpa.

[0110] The third step is to start the first-stage oxygen production module. The first-stage oxygen production module starts at step ① or step 2. The pressure equalization step (the step is a continuous cycle, and steps ① to ⑩ are a half cycle, which is the first adsorption tower 8 in oxygen production, arrive The first step is another half cycle, and the second adsorption tower 9 is producing oxygen. The first adsorption tower 8 and the second adsorption tower 9 have symmetry in producing oxygen. According to qualitative analysis and actual tests, from step ① or step 2 Starting in the step equalization phase can achieve the fastest oxygen concentration.

[0111] When the first-stage oxygen production module produces oxygen, each shuttle valve operates as shown in Table 1. The valve marked with 1 in the table indicates that the valve is open, and the valve marked with a blank indicates that the valve is closed.

[0112] Table 1 The opening and closing sequence of oxygen valves in the first-stage oxygen production module

[0113]

[0114] The fourth step is to open the first-stage oxygen production module, and then open the sixth shuttle valve 06A and the tenth shuttle valve 10A (or the seventeenth shuttle valve 06B and the twenty-first shuttle valve 10B, which valve to open depends on the stoppage of the second-stage oxygen production module. The third adsorption tower 11 opens the sixth shuttle valve 06A and the tenth shuttle valve 10A, and the fourth adsorption tower 12 opens the seventeenth shuttle valve 06B and the twenty-first shuttle valve 10B) to discharge the oxygen produced by the first-stage oxygen production module. When the pressure of the first-stage buffer tank 10 is stabilized at 0.5Mpa-0.6Mpa (preferably 0.52Mpa), and the oxygen concentration produced by the first-stage oxygen production module reaches 93%, and the second-stage oxygen production module is started when it is in a stable state. The stable state means that the oxygen concentration is in a constant or rising state within one minute and is higher than 93%. The operation of the second-stage oxygen production module is also a cyclic process, which includes two half-cycles. Steps ① to ④ are a half-cycle, in which the third adsorption tower 11 is producing oxygen, and steps ⑤ to ⑧ are another half-cycle, in which the fourth adsorption tower 12 is producing oxygen. The air intake stage of step ① or step ⑤ (corresponding to the third adsorption tower 11 or the fourth adsorption tower 12) is started. This step of the second-stage oxygen production module is also obtained based on the test. According to the actual test, the oxygen concentration of 99.5% can be reached fastest from step ① or step ⑤. A simple qualitative analysis shows that the oxygen is not consumed in the air intake stage and the oxygen stored in the pipeline of the entire second-stage oxygen production module is in the highest concentration state, so the expected oxygen concentration can be reached fastest from this step.

[0115] When the second-stage oxygen production module produces oxygen, each shuttle valve operates as shown in Table 2. The valve marked with 1 in the table indicates that the valve is open, and the valve marked with a blank indicates that the valve is closed.

[0116] Table 2 The switching sequence of oxygen valves in the second-stage oxygen production module

[0117]

[0118] Step 5: After the second-stage oxygen production module is started for 3 seconds, the circulating compressor 14 is started to start the second-stage oxygen production.

[0119] Step 6: When the oxygen concentration is less than 99.5%, the unqualified gas is discharged. When the oxygen concentration is greater than 99.5%, the oxygen enters the second-stage buffer tank 13 through the circulation compressor 14.

[0120] Because when there is a difference between the oxygen production flow and the oxygen consumption flow, the second-level buffer tank 13 will store pressure, which is beneficial for the hospital to supply oxygen in various scenarios. When the pressure of the second-level buffer tank 13 reaches a certain value, this value can be set according to the needs of the hospital, and the entire system enters standby mode.

[0121] The process of shutting down the entire oxygen production system is:

[0122] When entering the standby state, first turn off the second-stage oxygen production module, turn off the circulating compressor 14, etc., the second-stage oxygen production module stops at the first air intake stage, then turn off the first-stage oxygen production module, stop at the first pressure equalization stage, then turn off the air compressor, and turn off the cold dryer after a delay of 30s.

[0123] The method for rapidly increasing the oxygen concentration in the oxygen production system proposed in the present application is suitable for an ambient temperature of about 35° C. and a humidity of about 52.3% RH.

[0124] In the initial state, the air compressor provides a higher adsorption pressure to the air tank, which is conducive to the rapid establishment of balance in the first stage of oxygen production, and the concentration reaches 93%. After the first stage of oxygen production reaches the required concentration of 93%, the second stage of oxygen production can also quickly reach the concentration, because the second stage of oxygen production is actually a secondary purification of the first stage of oxygen production, removing the argon from 93% to reach a concentration of 99.5%. When the oxygen concentration of the first stage of oxygen production is low, the secondary purification efficiency of the second stage of oxygen production module is reduced, and the oxygen concentration increases slowly. The stop steps of the first stage oxygen production module and the second stage oxygen production module when starting in standby mode, stopping at the pressure equalization, air intake, exhaust, oxygen production, and cleaning steps have different effects on the next startup. When stopping at the exhaust, oxygen production, cleaning and other steps, the oxygen is in the module, which is not conducive to establishing balance. According to actual tests, the first stage of oxygen production module stops at the pressure equalization step, that is, step ① or step ②. The concentration will rise faster when the second-stage oxygen production module stops at the intake step.

[0125] The method for rapidly increasing oxygen concentration provided in the present application utilizes different opening steps of the adsorption tower to greatly improve the oxygen production speed of the oxygen production system.

[0126] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application is described in detail with reference to the embodiments, a person skilled in the art should understand that any modification or equivalent replacement of the technical solution of the present application does not depart from the spirit and scope of the technical solution of the present application and should be included in the scope of the claims of the present application.

Claims

1. An oxygen production system, characterized in that: include: The air pretreatment equipment, the first-stage oxygen production module and the second-stage oxygen production module are connected in sequence; The air pretreatment equipment comprises: an air compressor, an air-water separator, a cold dryer, a first filter, an air buffer tank, a second filter and an instrument air tank connected in sequence by pipelines; The first-stage oxygen production module includes: The first adsorption tower, the second adsorption tower, the first-stage buffer tank, and the first air release valve; a first shuttle valve, a first connection end of which is connected to the instrument gas tank, and a second connection end of which is connected to the inlet of the first adsorption tower; a second shuttle valve, a first connecting end of which is connected to the second connecting end of the first shuttle valve and the inlet of the first adsorption tower, and a second connecting end of which is connected to the first air release valve; a twelfth shuttle valve, a first connection end of which is connected to the instrument gas tank, and a second connection end of which is connected to the inlet of the second adsorption tower; a thirteenth shuttle valve, a first connection end of which is connected to the second connection end of the twelfth shuttle valve and the inlet of the second adsorption tower, and a second connection end of which is connected to the first air release valve; a third shuttle valve, a first connection end of which is connected to the second connection end of the twelfth shuttle valve and the inlet of the second adsorption tower, and a second connection end of which is connected to the outlet of the first adsorption tower; a fourteenth shuttle valve, a first connecting end of which is connected to the second connecting end of the first shuttle valve and the inlet of the first adsorption tower, and a second connecting end of which is connected to the outlet of the second adsorption tower; a fourth shuttle valve, a first connection end of which is connected to the outlet of the first adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank; a fifteenth shuttle valve, a first connection end of which is connected to the outlet of the second adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank; a fifth shuttle valve, a first connection end of which is connected to the outlet of the first adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank; and a sixteenth shuttle valve, a first connection end of which is connected to the outlet of the second adsorption tower, and a second connection end of which is connected to the inlet of the first-stage buffer tank; The second-stage oxygen production module includes: The third adsorption tower, the fourth adsorption tower, the second air release valve, the circulating compressor, and the second-stage buffer tank; a sixth shuttle valve, a first connection end of which is connected to the outlet of the first-stage buffer tank, and a second connection end of which is connected to the inlet of the third adsorption tower; The first connecting end of the seventeenth shuttle valve is connected to the outlet of the first-stage buffer tank, and the second connecting end is connected to the The fourth adsorption tower is connected; a seventh shuttle valve, a first connection end of which is connected to the second connection end of the sixth shuttle valve and the inlet of the third adsorption tower, and a second connection end of which is connected to the inlet of the circulating compressor; An eighteenth shuttle valve, a first connection end of which is connected to the second connection end of the seventeenth shuttle valve and the inlet of the fourth adsorption tower, and a second connection end of which is connected to the inlet of the circulation compressor; an eighth shuttle valve, a first connection end of which is connected to the first connection end of the seventh shuttle valve, and a second connection end of which is connected to the outlet of the circulating compressor; a nineteenth shuttle valve, a first connection end of which is connected to the first connection end of the eighteenth shuttle valve, and a second connection end of which is connected to the outlet of the circulating compressor; a ninth shuttle valve, a first connection end of which is connected to the inlet of the third adsorption tower, and a second connection end of which is connected to the outlet of the fourth adsorption tower; a twentieth shuttle valve, a first connection end of which is connected to the inlet of the fourth adsorption tower, and a second connection end of which is connected to the outlet of the third adsorption tower; a tenth shuttle valve, a first connection end of which is connected to the outlet of the third adsorption tower, and a second connection end of which is connected to the second air release valve; a twenty-first shuttle valve, a first connecting end of which is connected to the outlet of the fourth adsorption tower, and a second connecting end of which is connected to the second air release valve; an eleventh shuttle valve, a first connection end of which is connected to the inlet of the circulating compressor, and a second connection end of which is connected to the inlet of the second buffer tank; and A twenty-second shuttle valve has a first connection end connected to the outlet of the circulating compressor, and a second connection end connected to the inlet of the second-stage buffer tank.

2. The oxygen production system according to claim 1, characterized in that: The various components of the system are connected by stainless steel pipes.

3. A method for rapidly increasing oxygen concentration, implemented based on the oxygen production system according to claim 1 or 2, the method comprising: The steps of starting and operating the oxygen production system include: The first step is to start the cold dryer to make the air temperature reach the set temperature; The second step is to start the air compressor to make the pressure of the air buffer tank reach a first set pressure; The third step is to start the first-stage oxygen production module; Step 4: when the third adsorption tower was running when the second-stage oxygen production module was stopped last time, the sixth shuttle valve and the tenth shuttle valve are opened; when the fourth adsorption tower was stopped last time when the second-stage oxygen production module was stopped, the seventeenth shuttle valve and the twenty-first shuttle valve are opened to discharge the oxygen generated by the first-stage oxygen production module; when the pressure of the first-stage buffer tank is stabilized at the second set pressure, and the oxygen concentration generated by the first-stage oxygen production module reaches the first set concentration and is in a stable state, the second-stage oxygen production module is started; Step 5: After the second-stage oxygen production module starts for the first set time, the circulation compressor is started to start the second-stage oxygen production; Step 6. When the oxygen concentration is less than the second set concentration, the unqualified gas is discharged. When the oxygen concentration is greater than the second set concentration, the oxygen enters the second-stage buffer tank through the circulation compressor.

4. The method for rapidly increasing oxygen concentration according to claim 3, characterized in that: The operation of the first-stage oxygen production module is a continuous cycle process, which includes two half cycles, one half cycle is the oxygen production cycle of the first adsorption tower, and the other half cycle is the oxygen production cycle of the second adsorption tower; The first adsorption tower oxygen production cycle includes: A1: Open the third shuttle valve and close the other shuttle valves of the first-stage oxygen production module; A2: Open the second shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A3: Open the twelfth shuttle valve, the second shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A4: Open the twelfth shuttle valve, the second shuttle valve and the fifteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A5: Open the twelfth shuttle valve, the second shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A6: Open the twelfth shuttle valve, the second shuttle valve and the fifteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A7: Open the twelfth shuttle valve, the second shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A8: Open the twelfth shuttle valve, the second shuttle valve and the fifteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A9: Open the twelfth shuttle valve, the second shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; A10: Open the twelfth shuttle valve, the fifteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; The second adsorption tower oxygen production cycle includes: B1: Open the fourteenth shuttle valve and close the other shuttle valves of the first-stage oxygen production module; B2: Open the thirteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B3: Open the first shuttle valve, the thirteenth shuttle valve and the fifth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B4: Open the first shuttle valve, the thirteenth shuttle valve and the fourth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B5: Open the first shuttle valve, the thirteenth shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B6: Open the first shuttle valve, the thirteenth shuttle valve and the fourth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B7: Open the first shuttle valve, the thirteenth shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B8: Open the first shuttle valve, the thirteenth shuttle valve and the fourth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B9: Open the first shuttle valve, the thirteenth shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module; B10: Open the first shuttle valve, the fourth shuttle valve and the sixteenth shuttle valve, and close the other shuttle valves of the first-stage oxygen production module.

5. The method for rapidly increasing oxygen concentration according to claim 4, characterized in that: The first adsorption tower oxygen production cycle and the second adsorption tower oxygen production cycle can be started from any step.

6. The method for rapidly increasing oxygen concentration according to claim 4, characterized in that: The oxygen production cycle of the first adsorption tower starts from step A1; the oxygen production cycle of the second adsorption tower starts from step B1.

7. The method for rapidly increasing oxygen concentration according to claim 3, characterized in that: The operation of the second-stage oxygen production module is a continuous cycle process, which includes two half-cycles, one half-cycle is the oxygen production cycle of the third adsorption tower, and the other half-cycle is the oxygen production cycle of the fourth adsorption tower; The third adsorption tower oxygen production cycle includes: C1: Open the sixth shuttle valve, the eighteenth shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; C2: open the 18th shuttle valve, the 8th shuttle valve, the 10th shuttle valve and the 22nd shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; C3: Open the eighth shuttle valve, the tenth shuttle valve and the eleventh shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; C4: Open the 20th shuttle valve, the 11th shuttle valve and the 22nd shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; The fourth adsorption tower oxygen production cycle includes: D1: Open the seventeenth shuttle valve, the seventh shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; D2: Open the seventh shuttle valve, the nineteenth shuttle valve, the twenty-first shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; D3: Open the 19th shuttle valve, the 21st shuttle valve and the 11th shuttle valve, and close the other shuttle valves of the second-stage oxygen production module; D4: Open the ninth shuttle valve, the eleventh shuttle valve and the twenty-second shuttle valve, and close the other shuttle valves of the second-stage oxygen production module.

8. The method for rapidly increasing oxygen concentration according to claim 7, characterized in that: The third adsorption tower oxygen production cycle starts from step C1; the fourth adsorption tower oxygen production cycle starts from step D1.

9. The method for rapidly increasing oxygen concentration according to claim 3, characterized in that: The method further comprises: The shut down step of the oxygen production system comprises: When the oxygen production system enters the standby state, first turn off the second-stage oxygen production module, turn off the circulating compressor, and stop the second-stage oxygen production module at step C1 or D1; then turn off the first-stage oxygen production module, and stop the first-stage oxygen production module at step A1 or B1; then turn off the air compressor, and turn off the cold dryer after a third set time delay.

10. The method for rapidly increasing oxygen concentration according to claim 3, characterized in that: The set temperature is -0.7°C-2°C; the first set pressure is 0.6Mpa-0.7Mpa; and the second set pressure is 0.5Mpa-0.6Mpa.

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