Oxygen production system and oxygen production method

Abstract

The present invention discloses an oxygen production system and an oxygen production method. The oxygen production system includes an air compressor, a desiccant, a dry tank and an oxygen generator connected in sequence. The gas outlet ends of the two adsorption towers in the desiccant are respectively connected to the tail gas discharge port of the air intake control component in the oxygen generator through a one-way flow component. The one-way flow component allows the gas to flow only in one direction to the two adsorption towers. A ventilation component with controllable on and off is connected between the gas outlet ends of the two adsorption towers in the desiccant. The tail gas discharge port of the air intake control component in the oxygen generator is connected to an exhaust component with controllable on and off. The oxygen production method is to first switch the oxygen generator, use the tail gas of the oxygen generator to equalize the pressure of the desiccant, then empty the tail gas of the oxygen generator, switch the desiccant, and then use the tail gas of the oxygen generator to regenerate the desiccant. The present invention has the advantages of low energy consumption, simple structure, low cost, easy implementation and popularization, and can avoid affecting the regeneration of the oxygen generator itself.

Description

Technical Field

[0001] The invention relates to the technical field of compressed air purification equipment, and in particular to an oxygen production system and an oxygen production method. Background Art

[0002] In the field of compressed air purification, due to its special air intake requirements, the reversing function of air intake and exhaust is often required. For example, Figure 1 The figure shows a typical pressure swing adsorption oxygen production circuit system used in an existing oxygen concentrator. The working process and principle of the pressure swing adsorption oxygen production circuit system are as follows: the first solenoid valve 1 and the fourth solenoid valve 4 cooperate with each other to form a first gas circuit, the second solenoid valve 2 and the third solenoid valve 3 cooperate with each other to form a second gas circuit. When the first adsorption tower 100 is working, the second solenoid valve 2 and the third solenoid valve 3 are closed, the first solenoid valve 1 and the fourth solenoid valve 4 are opened, and the gas source enters the first adsorption tower 100 through the first solenoid valve 1. The first adsorption tower 100 is filled with adsorbent. Most of the purified gas enters the downstream and is provided to the gas-using equipment. A small part (about 16% to 20%) enters the second adsorption tower 200 through the throttle valve 7 (the gas pressure after passing through the throttle valve 7 is approximately equal to the atmospheric pressure) for backblowing (or analysis). When the second adsorption tower 200 is working, the first solenoid valve 1 and the fourth solenoid valve 4 are closed, the second solenoid valve 2 and the third solenoid valve 3 are opened, and the gas source enters the second adsorption tower 200 through the second solenoid valve 2. The second adsorption tower 200 is filled with adsorbent. Most of the purified gas enters the downstream and is provided to the gas-using equipment. A small part (about 16% to 20%) enters the first adsorption tower 100 through the throttle valve 7 (the gas pressure after passing through the throttle valve 7 is approximately equal to the atmospheric pressure) to backflush (or analyze, regenerate) the impurity gas trapped in the adsorbent in the previous cycle. After the backflush gas passes through the first adsorption tower 100, the tail gas is emptied through the third solenoid valve 3. The first gas circuit and the second gas circuit work alternately, so that the gas source alternately passes through the first adsorption tower 100 and the second adsorption tower 200 for purification. At the same time, when one adsorption tower is working, the other adsorption tower is fed with backflush gas to regenerate the adsorbent.

[0003] In order to avoid the impact of sudden pressure changes on downstream gas-using equipment and to slow down the pulverization of the adsorbent in the first adsorption tower 100 and the second adsorption tower 200 due to sudden pressure changes, an equalization stage will be added to the intake air before switching between the first adsorption tower 100 and the second adsorption tower 200. At the same time, in order to improve the oxygen recovery efficiency and reduce energy consumption, a top-bottom equalization method is adopted (the gas enters from the top of the adsorption tower, and the pressure is gradually built up in the adsorption tower to complete the equalization): after the adsorbent in the second adsorption tower 200 is fully regenerated, the fourth solenoid valve 4 is closed in advance, so that the pressure in the second adsorption tower 200 is gradually increased from normal pressure to the working pressure, and then the first solenoid valve 1 is closed, and the second solenoid valve 2 and the third solenoid valve 3 are opened at the same time.

[0004] The commonly used oxygen production systems are as follows: Figure 2 As shown, it includes an air compressor 101, a cold dryer 102, a dry tank 103 and an oxygen generator 104 connected in sequence. The structural principle of the oxygen generator 104 is the aforementioned pressure swing adsorption oxygen production circuit system. Its oxygen production process is: the compressed gas generated by the air compressor 101 is processed by the cold dryer 102 (dew point +3℃~+5℃. Note: dew point is an indicator for judging the water content. The lower the dew point, the less water content), and the moisture in the air is removed to obtain relatively clean and dry compressed air. The cleaner the air source entering the oxygen generator 104, the easier it is to ensure the oxygen concentration of the finished product. At the same time, the more stable the gas production, the longer the service life of the adsorbent used in the oxygen generator 104. The cold dryer 102 is widely used in air pretreatment processes due to its simple manufacturing process and low cost. At present, it occupies most of the domestic air treatment market.

[0005] With the understanding of the characteristics of the molecular sieve of the oxygen generator, it is found that the cleanliness of the air plays a vital role in the purity and stability of the subsequent oxygen production. Therefore, the original air handling unit cold dryer 102 is further replaced with a better treatment effect adsorption dryer 105 (dew point can reach -40℃). Figure 3 As shown. It has been proved that after the introduction of the desiccant 105 into the oxygen production process, the oxygen concentration at the outlet of the oxygen generator 104 reaches the required standard more quickly, and the life of the molecular sieve is greatly improved. However, since the manufacturing principle of the desiccant 103 is still pressure swing adsorption, the desiccant 105 needs to consume 16%-20% of the dry compressed air at its own outlet as regeneration gas in order to maintain stable operation (this regeneration gas comes from the regeneration method of its own outlet, which is called "self-regeneration" method). Therefore, in order to meet the original oxygen production, it is necessary to increase the gas output of the air compressor 101. From the results, the self-regeneration oxygen production process of the desiccant 105 will increase the energy consumption per unit oxygen production.

[0006] From the composition of the exhaust gas of the oxygen generator 104, although the exhaust gas of the oxygen generator 104 is a mixed gas of nitrogen and oxygen (nitrogen-rich gas), it is a dry gas with a low dew point, and the total amount of gas discharged is more than the amount of gas required for the regeneration of the adsorption dryer 105. In other words, the exhaust gas discharged by the oxygen generator 104 can meet the requirements of the regeneration gas of the adsorption dryer 105 in terms of dryness and gas volume. Based on this, if Figure 4 As shown, there is a prior art that adds a buffer tank 106 to the oxygen production system, connects the exhaust gas outlet of the oxygen generator 104 to the buffer tank 106 through a pipeline with a first one-way valve 107, and then connects the gas outlet ends of the first adsorption tower 100 and the second adsorption tower 200 in the adsorption dryer 105 to the buffer tank 106 through a second one-way valve 108, respectively, and replaces the throttle valve 5 connected to the gas outlet ends of the first adsorption tower 100 and the second adsorption tower 200 in the adsorption dryer 105 with a first on-off control valve 109, and connects a pipeline with a second on-off control valve 110 to the exhaust gas outlet of the oxygen generator 104.

[0007] By making the above adjustments to the oxygen production system, when the second adsorption tower 200 of the oxygen generator 104 is pressure-equalized, the second solenoid valve 2 and the third solenoid valve 3 of the oxygen generator 104 can be opened first to allow a portion of the nitrogen-rich gas in the first adsorption tower 100 to enter the buffer tank 106, and then the second on-off control valve 110 can be opened a few seconds later, so that the remaining nitrogen-rich gas in the first adsorption tower 100 is discharged through the third solenoid valve 3 and the second on-off control valve 110 of the oxygen generator 104, so that the first adsorption tower 100 is quickly depressurized, reaching the lowest pressure point in the shortest time, and entering the optimal regeneration condition, until entering the next pressure-equalizing state and then closing the third solenoid valve 3 and the second on-off control valve 110 of the oxygen generator 104.

[0008] Since the first adsorption tower 100 and the second adsorption tower 200 in the desiccant 105 are connected to the buffer tank 106 through the second one-way valve 108, the nitrogen-rich gas in the buffer tank 106 will push open the second one-way valve 108 with a lower pressure, enter the regeneration chamber, and analyze the adsorbent. The first on-off control valve 109 in the desiccant is used as a pressure equalizing valve. Only when it is in a pressure equalizing state, the first on-off control valve 109 is opened to input the gas from the working chamber into the regeneration chamber, and increase the pressure of the regeneration chamber from 0 to the working pressure, so as to achieve the purpose of pressure equalization.

[0009] The interval time between the opening of the third solenoid valve 3 and the second on-off control valve 110 of the oxygen generator 104 determines the amount of nitrogen-rich gas entering the buffer tank 106. The PSA principle requires that the pressure of the regeneration chamber should be as low as possible, so the pressure should be reduced rapidly after the original working chamber is switched to the regeneration chamber. Because the buffer tank 106 is a closed container, the pressure reduction rate of the original regeneration chamber will slow down with time before the second on-off control valve 110 is opened. Therefore, the air intake time of the buffer tank 106 cannot be too long. The appropriate amount of nitrogen-rich gas entering the buffer tank 106 can not only ensure the backflush gas volume of the dryer 105, but also not affect the regeneration of the oxygen generator 104 itself. This requires theoretical calculation and actual testing to determine.

[0010] From the above analysis, it can be seen that the exhaust gas emission after pressure equalization of the oxygen generator 104 is actually divided into two steps, that is, the first step is to store a part of the exhaust gas in the buffer tank 106, and the second step is to discharge the remaining exhaust gas through the second on-off control valve 110.

[0011] Compared with the self-regeneration oxygen production process of the desiccant 105, this process can use the tail gas of the oxygen generator 104 to regenerate the desiccant 105, greatly reducing the gas consumption of the desiccant and effectively reducing the unit energy consumption of oxygen production. The existence of the buffer tank 106 "organically" separates the desiccant 105 and the oxygen generator 104, so that the PSA actions of the two do not affect each other.

[0012] However, the nitrogen-rich tail gas from the oxygen generator 104 only participates in the regeneration of the desiccant 105, but does not participate in the pressure equalization of the desiccant 105. The gas exhausted from the chamber to be regenerated after the air intake of the oxygen generator 104 is switched is still the dry gas from the outlet of the oxygen generator 104, that is, the process still consumes the dry gas from the outlet of the desiccant 105. It can be seen that the high-pressure nitrogen-rich gas of the oxygen generator 104 is not fully utilized. At the same time, the existence of the buffer tank 105 will affect the pressure reduction rate of the regeneration chamber of the oxygen generator 104, thereby affecting the regeneration efficiency of the oxygen generator 104. In addition, the buffer tank 104 and its pipeline structure are complex, which will not only increase the equipment cost, but also increase the installation and maintenance cost. Summary of the invention

[0013] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide an oxygen production system with low energy consumption, simple structure, low cost, easy implementation and popularization and application. Correspondingly, an oxygen production method is provided which can reduce energy consumption and avoid affecting the regeneration of the oxygen generator itself.

[0014] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0015] An oxygen production system comprises an air compressor, a dryer, a dry tank and an oxygen concentrator which are connected in sequence, wherein the dryer and the oxygen concentrator each comprise two adsorption towers, the air inlet ends of the two adsorption towers are connected to the dry tank via an air inlet control component, the air outlet ends of the two adsorption towers are connected to an exhaust control component, the air outlet ends of the two adsorption towers in the dryer are respectively connected to an exhaust gas discharge port of an air inlet control component in the oxygen concentrator via a one-way flow component, the one-way flow component allows gas to flow only in one direction to the two adsorption towers, a ventilation component whose on / off controllable is connected between the air outlet ends of the two adsorption towers in the dryer, and an exhaust component whose on / off controllable is connected to an exhaust gas discharge port of the air inlet control component in the oxygen concentrator.

[0016] In the above-mentioned oxygen production system, preferably, the one-way flow component includes a first pipeline, one end of which is connected to the exhaust gas outlet of the oxygen generator, and the gas outlet ends of the two adsorption towers in the dryer are respectively connected to the other end of the first pipeline through a first one-way valve.

[0017] In the above oxygen production system, preferably, the ventilation component includes a second pipeline, the gas outlet ends of the two adsorption towers in the desiccant are connected through the second pipeline, and the second pipeline is provided with a first on-off control valve.

[0018] In the above oxygen production system, preferably, the exhaust component comprises an exhaust pipeline connected to the tail gas discharge port of the oxygen generator, and the exhaust pipeline is provided with a second on-off control valve for controlling the on-off of the exhaust pipeline.

[0019] In the above-mentioned oxygen production system, preferably, the exhaust control component of the dryer includes a first outlet pipe, and the outlet ends of the two adsorption towers in the dryer are respectively connected to the first outlet pipe through a second one-way valve that allows the gas to flow only in one direction to the first outlet pipe; the exhaust control component of the oxygen concentrator includes a second outlet pipe, and the outlet ends of the two adsorption towers in the oxygen concentrator are respectively connected to the second outlet pipe through a third one-way valve that allows the gas to flow only in one direction to the second outlet pipe, and the outlet ends of the two adsorption towers in the oxygen concentrator are connected via a throttle valve.

[0020] In the above-mentioned oxygen production system, preferably, the air intake control component includes a tail gas discharge port and an air intake port, the air intake end of each adsorption tower is connected to the tail gas discharge port through an independent third on-off control valve, and the air intake end of each adsorption tower is connected to the air intake port through an independent fourth on-off control valve.

[0021] As a general technical concept, the present invention also provides an oxygen production method for the above oxygen production system, wherein the oxygen production method is as follows: the time from the start of adsorption work of each adsorption tower of the adsorption dryer to the switch to another adsorption tower for adsorption work is set as S1, and the time from the start of adsorption work of each adsorption tower of the oxygen generator to the switch to another adsorption tower for adsorption work is set as S2, so that S1 is equal to S2; the adsorption tower performing adsorption work during the operation of the adsorption dryer is defined as Tower A, and the other adsorption tower is defined as Tower B; the adsorption tower performing adsorption work during the operation of the oxygen generator is defined as Tower C, and the other adsorption tower is defined as Tower D;

[0022] The switching time of the adsorption dryer is later than the switching time of the oxygen generator. When the oxygen generator switches from adsorption work of tower C to adsorption work of tower D, the exhaust component is disconnected first, so that the tail gas discharged from the oxygen generator enters tower B through the one-way circulation component to pressurize tower B. After a preset time, the ventilation component and the exhaust component are connected, so that the gas in tower C is emptied through the exhaust component, and at the same time, the gas output from the air outlet of tower A enters tower B through the ventilation component to pressurize tower B again, so that the pressure in tower B reaches the preset working pressure, and then the adsorption dryer switches from adsorption work of tower A to adsorption work of tower B; when the pressure of tower A drops to zero, the exhaust component is disconnected, so that the tail gas of the oxygen generator enters tower A through the one-way circulation component to regenerate tower A.

[0023] In the above oxygen production method, preferably, the preset time is less than S2 / 20.

[0024] As a general technical concept, the present invention also provides another oxygen production method of the above oxygen production system, in which the oxygen production method is as follows: the time from the start of adsorption work of each adsorption tower of the adsorption dryer to the switch to another adsorption tower for adsorption work is set as S1, and the time from the start of adsorption work of each adsorption tower of the oxygen generator to the switch to another adsorption tower for adsorption work is set as S2, so that S1 is an integer multiple of S2; the adsorption tower that performs adsorption work during the operation of the adsorption dryer is defined as Tower A, and the other adsorption tower is defined as Tower B; the adsorption tower that performs adsorption work during the operation of the oxygen generator is defined as Tower C, and the other adsorption tower is defined as Tower D;

[0025] In the time period of S1, the time when the adsorption dryer is switched is later than the time when the oxygen generator is last switched, and when the oxygen generator is last switched from tower C to tower D for adsorption, the exhaust component is first disconnected to allow the tail gas discharged from the oxygen generator to enter tower B through the one-way circulation component to pressurize tower B. After a preset time, the ventilation component and the exhaust component are connected to allow the gas in tower C to be emptied through the exhaust component, and at the same time, the gas output from the gas outlet of tower A enters tower B through the ventilation component to pressurize tower B again, so that the pressure in tower B reaches the preset working pressure, and then the adsorption dryer is switched from tower A to tower B for adsorption; when the pressure of tower A drops to zero, the exhaust component is disconnected to allow the tail gas of the oxygen generator to enter tower A through the one-way circulation component to regenerate tower A;

[0026] When the oxygen generator switches from Tower C to Tower D for adsorption at other times, first disconnect the ventilation component and the exhaust component, and equalize the pressure from Tower C to Tower D. When the pressure of Tower D reaches the predetermined working pressure, first connect the exhaust component to quickly reduce the pressure of Tower C to zero, then close the exhaust component and open the ventilation component at the same time, so that the exhaust gas discharged from the homemade oxygen generator continues to enter Tower B through the one-way flow component to regenerate Tower B.

[0027] In the above oxygen production method, preferably, the preset time is less than S2 / 20.

[0028] Compared with the prior art, the advantages of the present invention are:

[0029] In the oxygen production system of the present invention, during the production process, after the high-pressure nitrogen-rich gas generated during the regeneration of the adsorption tower in the oxygen generator is discharged from the tail gas outlet, the high-pressure nitrogen-rich gas discharged from the tail gas outlet of the oxygen generator can be selectively entered into the air inlet end of each adsorption tower in the adsorption dryer by controlling the connection and disconnection of the exhaust assembly, and used for the pressure equalization and regeneration of the adsorption tower in the adsorption dryer. When the oxygen production amount of the oxygen generator remains unchanged, the air supply of the air compressor can be reduced, thereby reducing the energy consumption per unit oxygen production. In addition, the air outlet ends of the two adsorption towers in the adsorption dryer are directly connected to the tail gas outlet of the oxygen generator through a one-way flow assembly, which can reduce pipeline connections, make the process smoother, and reduce the equipment installation and maintenance costs, making it easy to implement and promote application.

[0030] The oxygen production method of the present invention makes full use of the high-pressure nitrogen-rich tail gas of the oxygen generator to balance the pressure and regenerate the dehydrator, which can greatly save dry air at the outlet of the dehydrator and further reduce the energy consumption per unit oxygen output. At the same time, in the pressure equalization process of the dehydrator, the high-pressure nitrogen-rich tail gas of the oxygen generator is first used for pre-pressurization for a preset time, and then the dry air generated by the dehydrator itself is used for pressure equalization again, and the high-pressure nitrogen-rich tail gas of the oxygen generator is emptied for a period of time, and then the high-pressure nitrogen-rich tail gas of the oxygen generator is used to regenerate the dehydrator, which can avoid affecting the regeneration of the oxygen generator itself. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 This is the schematic diagram of the pressure swing adsorption oxygen production system.

[0032] Figure 2 This is the schematic diagram of the existing oxygen production system using a cold dryer.

[0033] Figure 3 The schematic diagram of the existing oxygen production system using an adsorption dryer is shown in FIG.

[0034] Figure 4 The schematic diagram of the oxygen production system of the existing adsorption dryer and buffer tank.

[0035] Figure 5 It is a schematic diagram of the oxygen production system of the present invention.

[0036] Legend:

[0037] 1. Air compressor; 2. Dryer; 3. Dry tank; 4. Oxygen generator; 101. Adsorption tower; 1011. Air inlet; 1012. Air outlet; 102. Air inlet control component; 1021. Exhaust outlet; 1022. Air inlet; 103. Exhaust control component; 1031. First outlet pipe; 1032. Second outlet pipe; 201. First pipeline; 202. Second pipeline; 203. Exhaust pipeline; 301. First one-way valve; 302. Second one-way valve; 303. Third one-way valve; 401. First on-off control valve; 402. Second on-off control valve; 403. Third on-off control valve; 404. Fourth on-off control valve; 501. Throttle valve. DETAILED DESCRIPTION

[0038] The present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0039] Embodiment 1:

[0040] like Figure 5 As shown, the oxygen production system of this embodiment includes an air compressor 1, a dryer 2, a dry tank 3 and an oxygen concentrator 4 which are connected in sequence. The dryer 2 and the oxygen concentrator 4 each include two adsorption towers 101. The air inlet ends 1011 of the two adsorption towers 101 are connected to the dry tank 3 through an air inlet control component 102. The air outlet ends 1012 of the two adsorption towers 101 are connected to an exhaust control component 103. The air outlet ends 1012 of the two adsorption towers 101 in the dryer 2 are respectively connected to an exhaust gas discharge port 1021 of the air inlet control component 102 in the oxygen concentrator 4 through a one-way flow component. The one-way flow component allows the gas to flow only in one direction to the two adsorption towers 101. A ventilation component with controllable on / off is connected between the air outlet ends 1012 of the two adsorption towers 101 in the dryer 2. The exhaust gas discharge port 1021 of the air inlet control component 102 in the oxygen concentrator 4 is connected to an exhaust component with controllable on / off.

[0041] In the oxygen production system, during the production process, after the high-pressure nitrogen-rich gas generated during the regeneration of the adsorption tower 101 in the oxygen generator 4 is discharged from the tail gas discharge port 1021, the high-pressure nitrogen-rich gas discharged from the tail gas discharge port 1021 of the oxygen generator 4 can be selectively entered into the air inlet 1011 of each adsorption tower 101 in the desiccant 2 by controlling the connection and disconnection of the exhaust component, and used for the pressure equalization and regeneration of the adsorption tower 101 in the desiccant 2. When the oxygen production of the oxygen generator 4 remains unchanged, the air supply of the air compressor 1 can be reduced, thereby reducing the energy consumption per unit oxygen production. In addition, the air outlets 1012 of the two adsorption towers 101 in the desiccant 2 are directly connected to the tail gas discharge port 1021 of the oxygen generator 4 through a one-way flow component, which can reduce pipeline connections, make the process smoother, and reduce the equipment installation and maintenance costs, making it easy to implement and promote application.

[0042] In this embodiment, the one-way flow assembly includes a first pipeline 201, one end of which is connected to the tail gas discharge port 1021 of the oxygen generator 4, and the gas outlets 1012 of the two adsorption towers 101 in the dryer 2 are respectively connected to the other end of the first pipeline 201 through a first one-way valve 301. It has a simple and compact structure, low cost, and is easy to assemble.

[0043] In this embodiment, the ventilation component includes a second pipeline 202, and the air outlet ends 1012 of the two adsorption towers 101 in the dryer 2 are connected through the second pipeline 202. The second pipeline 202 is provided with a first on-off control valve 401. The first on-off control valve 401 is used to control the oxygen output from the air outlet end 1012 of one adsorption tower 101 to be passed into another adsorption tower 101 for pressure equalization. The structure is simple and compact, the cost is low, and it is easy to assemble.

[0044] In this embodiment, the exhaust assembly includes an exhaust pipeline 203 connected to the exhaust outlet 1021 of the oxygen generator 4, and a second on-off control valve 402 is provided on the exhaust pipeline 203 for controlling the on-off of the exhaust pipeline 203. It has a simple and compact structure, low cost and easy assembly.

[0045] In this embodiment, the exhaust control component 103 of the dryer 2 includes a first air outlet pipe 1031, and the air outlet ends 1012 of the two adsorption towers 101 in the dryer 2 are respectively connected to the first air outlet pipe 1031 through a second one-way valve 302 that allows the gas to flow only in one direction to the first air outlet pipe 1031; the exhaust control component 103 of the oxygen generator 4 includes a second air outlet pipe 1032, and the air outlet ends 1012 of the two adsorption towers 101 in the oxygen generator 4 are respectively connected to the second air outlet pipe 1032 through a third one-way valve 303 that allows the gas to flow only in one direction to the second air outlet pipe 1032, and the air outlet ends 1012 of the two adsorption towers 101 in the oxygen generator 4 are connected through a throttle valve 501.

[0046] In this embodiment, the air intake control component 102 includes an exhaust gas emission port 1021 and an air intake port 1022. The air intake end 1011 of each adsorption tower 101 is connected to the exhaust gas emission port 1021 through an independent third on-off control valve 403, and the air intake end 1011 of each adsorption tower 101 is connected to the air intake port 1022 through an independent fourth on-off control valve 404.

[0047] The above-mentioned air intake control component 102 and exhaust control component 103 can meet the air intake and exhaust requirements of the desiccant machine 2 and the oxygen concentrator 4. In other embodiments, the air intake control component 102 and the exhaust control component 103 can also adopt other existing forms as long as they can meet the air intake and exhaust requirements of the desiccant machine 2 and the oxygen concentrator 4.

[0048] Embodiment 2:

[0049] The oxygen production method of the oxygen production system of Example 1 is adopted. The oxygen production method is as follows: the time from the start of adsorption work of each adsorption tower 101 of the adsorption dryer 2 to the switch to another adsorption tower 101 for adsorption work is set as S1, and the time from the start of adsorption work of each adsorption tower 101 of the oxygen generator 4 to the switch to another adsorption tower 101 for adsorption work is set as S2, so that S1 is equal to S2; the adsorption tower 101 performing adsorption work during the operation of the adsorption dryer 2 is defined as tower A, and the other adsorption tower 101 is defined as tower B; the adsorption tower 101 performing adsorption work during the operation of the oxygen generator 4 is defined as tower C, and the other adsorption tower 101 is defined as tower D;

[0050] The time when the adsorption dryer 2 is switched is later than the time when the oxygen generator 4 is last switched. When the oxygen generator 4 switches from adsorption work in tower C to adsorption work in tower D, the exhaust component is disconnected first, so that the tail gas discharged from the oxygen generator 4 enters tower B through the one-way circulation component to pressurize tower B. After a preset time, the ventilation component and the exhaust component are connected, so that the gas in tower C is emptied through the exhaust component, and at the same time, the gas output from the gas outlet 1012 of tower A enters tower B through the ventilation component to pressurize tower B again, so that the pressure in tower B reaches the preset working pressure, and then the adsorption dryer 2 switches from adsorption work in tower A to adsorption work in tower B; when the pressure in tower A drops to zero, the exhaust component is disconnected, so that the tail gas of the oxygen generator 4 enters tower A through the one-way circulation component to regenerate tower A.

[0051] This oxygen production method makes full use of the high-pressure nitrogen-rich tail gas of the oxygen generator 4 to equalize the pressure and regenerate the desiccant 2, which can greatly save dry air at the outlet of the desiccant 2 and further reduce the energy consumption per unit oxygen output. At the same time, during the pressure equalization process of the desiccant 2, the high-pressure nitrogen-rich tail gas of the oxygen generator 4 is first used for preliminary pressurization for a preset time, and then the dry air generated by the desiccant 2 itself is used for re-equalization, and the high-pressure nitrogen-rich tail gas of the oxygen generator 4 is emptied for a period of time, and then the high-pressure nitrogen-rich tail gas of the oxygen generator 4 is used to regenerate the desiccant 2, which can avoid affecting the regeneration of the oxygen generator 104 itself.

[0052] In this embodiment, the preset time is less than S2 / 20. This can prevent the pressure equalization time from tower C to tower B from being too long, which would occupy the regeneration time of tower C and affect the oxygen production effect, while making the most of the dry nitrogen-rich gas in tower C. Preferably, the preset time range is S2 / 30 to S2 / 20 to achieve the best effect.

[0053] Embodiment 3:

[0054] An oxygen production method using the oxygen production system of Example 1, the oxygen production method is as follows: the time from the start of adsorption work of each adsorption tower 101 of the adsorption dryer 2 to the switch to another adsorption tower 101 for adsorption work is set as S1, and the time from the start of adsorption work of each adsorption tower 101 of the oxygen generator 4 to the switch to another adsorption tower 101 for adsorption work is set as S2, so that S1 is an integer multiple of S2; the adsorption tower 101 performing adsorption work during the operation of the adsorption dryer 2 is defined as tower A, and the other adsorption tower 101 is defined as tower B; the adsorption tower 101 performing adsorption work during the operation of the oxygen generator 4 is defined as tower C, and the other adsorption tower 101 is defined as tower D;

[0055] In the time period of S1, the time when the adsorption dryer 2 is switched is later than the time when the oxygen generator 4 is last switched, and when the oxygen generator 4 switches from the adsorption work of tower C to the adsorption work of tower D for the last time, the exhaust component is first disconnected, so that the tail gas discharged from the oxygen generator 4 enters tower B through the one-way circulation component to pressurize tower B, and after a preset time, the ventilation component and the exhaust component are connected, so that the gas in tower C is emptied through the exhaust component, and at the same time, the gas output from the gas outlet 1012 of tower A enters tower B through the ventilation component to pressurize tower B again, so that the pressure in tower B reaches the preset working pressure, and then the adsorption dryer 2 switches from the adsorption work of tower A to the adsorption work of tower B; when the pressure of tower A drops to zero, the exhaust component is disconnected, so that the tail gas of the oxygen generator 4 enters tower A through the one-way circulation component to regenerate tower A;

[0056] When the oxygen generator 4 switches from tower C to tower D for adsorption at other times, the ventilation component and the exhaust component are disconnected first, and the pressure is equalized from tower C to tower D. When the pressure of tower D reaches the predetermined working pressure, the exhaust component is connected first to quickly reduce the pressure of tower C to zero, and then the exhaust component is closed, and the ventilation component is opened at the same time, so that the tail gas discharged from the oxygen generator 4 continues to enter tower B through the one-way flow component to regenerate tower B. In this way, during the time period of the oxygen generator 4 in S1, except for the last time when the oxygen generator 4 is switched, the desiccant 3 only uses the normal pressure backflush gas from the oxygen generator 4; and when the desiccant 3 needs to switch the working chamber, it can make full use of the high-pressure backflush gas from the last switch of the oxygen generator 4 to equalize the pressure, thereby saving energy to the maximum extent.

[0057] This oxygen production method makes full use of the high-pressure nitrogen-rich tail gas of the oxygen generator 4 to equalize the pressure and regenerate the desiccant 2, which can greatly save dry air at the outlet of the desiccant 2 and further reduce the energy consumption per unit oxygen output. At the same time, during the pressure equalization process of the desiccant 2, the high-pressure nitrogen-rich tail gas of the oxygen generator 4 is first used for preliminary pressurization for a preset time, and then the dry air generated by the desiccant 2 itself is used for re-equalization, and the high-pressure nitrogen-rich tail gas of the oxygen generator 4 is emptied for a period of time, and then the high-pressure nitrogen-rich tail gas of the oxygen generator 4 is used to regenerate the desiccant 2, which can avoid affecting the regeneration of the oxygen generator 104 itself.

[0058] In this embodiment, the preset time is less than S2 / 20. This can prevent the pressure equalization time from tower C to tower B from being too long, which would occupy the regeneration time of tower C and affect the oxygen production effect, while making the most of the dry nitrogen-rich gas in tower C. Preferably, the preset time range is S2 / 30 to S2 / 20 to achieve the best effect.

[0059] The above is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments. For those skilled in the art, improvements and changes obtained without departing from the technical concept of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An oxygen production method for an oxygen production system, the oxygen production system comprising an air compressor (1), a desiccant (2), a dry tank (3) and an oxygen production machine (4) connected in sequence, the desiccant (2) and the oxygen production machine (4) each comprising two adsorption towers (101), the air inlet ends (1011) of the two adsorption towers (101) being connected to the dry tank (3) via an air inlet control component (102), and the air outlet ends (1012) of the two adsorption towers (101) being connected to an exhaust control component (103), characterized in that: The gas outlet ends (1012) of the two adsorption towers (101) in the adsorption dryer (2) are respectively connected to the tail gas discharge port (1021) of the air intake control component (102) in the oxygen concentrator (4) via a one-way flow component, the one-way flow component allows the gas to flow only in one direction to the two adsorption towers (101), a ventilation component that can be controlled to be on and off is connected between the gas outlet ends (1012) of the two adsorption towers (101) in the adsorption dryer (2), and the tail gas discharge port (1021) of the air intake control component (102) in the oxygen concentrator (4) is connected to an exhaust component that can be controlled to be on and off; The oxygen production method comprises setting the time from the start of adsorption work of each adsorption tower (101) of the desiccant (2) to the switch to another adsorption tower (101) for adsorption work as S1, and the time from the start of adsorption work of each adsorption tower (101) of the oxygen generator (4) to the switch to another adsorption tower (101) for adsorption work as S2, so that S1 is equal to S2; the adsorption tower (101) performing adsorption work during the operation of the desiccant (2) is defined as tower A, and the other adsorption tower (101) is defined as tower B; the adsorption tower (101) performing adsorption work during the operation of the oxygen generator (4) is defined as tower C, and the other adsorption tower (101) is defined as tower D; The time when the adsorption dryer (2) is switched is later than the time when the oxygen generator (4) is switched. When the oxygen generator (4) switches from adsorption operation in tower C to adsorption operation in tower D, the exhaust component is first disconnected, so that the tail gas discharged from the oxygen generator (4) enters tower B through the one-way circulation component to pressurize tower B. After a preset time, the ventilation component and the exhaust component are connected, so that the gas in tower C is emptied through the exhaust component. At the same time, the gas output from the gas outlet (1012) of tower A enters tower B through the ventilation component to pressurize tower B again, so that the pressure in tower B reaches the preset working pressure, and then the adsorption dryer (2) switches from adsorption operation in tower A to adsorption operation in tower B. When the pressure in tower A drops to zero, the exhaust component is disconnected, so that the tail gas of the oxygen generator (4) enters tower A through the one-way circulation component to regenerate tower A.

2. The oxygen production method according to claim 1, characterized in that: The one-way flow component comprises a first pipeline (201), one end of which is connected to the tail gas discharge port (1021) of the oxygen generator (4), and the gas outlet ends (1012) of the two adsorption towers (101) in the desiccant (2) are respectively connected to the other end of the first pipeline (201) via a first one-way valve (301).

3. The oxygen production method according to claim 1, characterized in that: The ventilation assembly comprises a second pipeline (202), and the gas outlet ends (1012) of the two adsorption towers (101) in the desiccant (2) are connected via the second pipeline (202). The second pipeline (202) is provided with a first on-off control valve (401).

4. The oxygen production method according to claim 1, characterized in that: The exhaust assembly comprises an exhaust pipeline (203) connected to an exhaust gas discharge port (1021) of an oxygen concentrator (4), and a second on-off control valve (402) for controlling the on-off of the exhaust pipeline (203) is provided on the exhaust pipeline (203).

5. The oxygen production method according to any one of claims 1 to 4, characterized in that: The exhaust control component (103) of the desiccant (2) comprises a first exhaust pipe (1031), and the exhaust ends (1012) of the two adsorption towers (101) in the desiccant (2) are respectively connected to the first exhaust pipe (1031) via a second one-way valve (302) that allows gas to flow only in one direction toward the first exhaust pipe (1031); the exhaust control component (103) of the oxygen concentrator (4) comprises a second exhaust pipe (1032), and the exhaust ends (1012) of the two adsorption towers (101) in the oxygen concentrator (4) are respectively connected to the second exhaust pipe (1032) via a third one-way valve (303) that allows gas to flow only in one direction toward the second exhaust pipe (1032), and the exhaust ends (1012) of the two adsorption towers (101) in the oxygen concentrator (4) are connected via a throttle valve (501).

6. The oxygen production method according to any one of claims 1 to 4, characterized in that: The air intake control component (102) comprises an exhaust gas discharge port (1021) and an air intake port (1022); the air intake end (1011) of each adsorption tower (101) is connected to the exhaust gas discharge port (1021) via an independent third on-off control valve (403); and the air intake end (1011) of each adsorption tower (101) is connected to the air intake port (1022) via an independent fourth on-off control valve (404).

7. The oxygen production method according to claim 1, characterized in that: The preset time is less than S2 / 20.

8. An oxygen production method for an oxygen production system, the oxygen production system comprising an air compressor (1), a desiccant (2), a dry tank (3) and an oxygen production machine (4) connected in sequence, the desiccant (2) and the oxygen production machine (4) each comprising two adsorption towers (101), the air inlet ends (1011) of the two adsorption towers (101) being connected to the dry tank (3) via an air inlet control component (102), and the air outlet ends (1012) of the two adsorption towers (101) being connected to an exhaust control component (103), characterized in that: The gas outlet ends (1012) of the two adsorption towers (101) in the adsorption dryer (2) are respectively connected to the tail gas discharge port (1021) of the air intake control component (102) in the oxygen concentrator (4) via a one-way flow component, the one-way flow component allows the gas to flow only in one direction to the two adsorption towers (101), a ventilation component that can be controlled to be on and off is connected between the gas outlet ends (1012) of the two adsorption towers (101) in the adsorption dryer (2), and the tail gas discharge port (1021) of the air intake control component (102) in the oxygen concentrator (4) is connected to an exhaust component that can be controlled to be on and off; The oxygen production method comprises setting the time from the start of adsorption work of each adsorption tower (101) of the desiccant (2) to the switch to another adsorption tower (101) for adsorption work as S1, and the time from the start of adsorption work of each adsorption tower (101) of the oxygen generator (4) to the switch to another adsorption tower (101) for adsorption work as S2, so that S1 is an integer multiple of S2; the adsorption tower (101) performing adsorption work during the operation of the desiccant (2) is defined as tower A, and the other adsorption tower (101) is defined as tower B; the adsorption tower (101) performing adsorption work during the operation of the oxygen generator (4) is defined as tower C, and the other adsorption tower (101) is defined as tower D; In the time period S1, the time when the adsorption dryer (2) is switched is later than the time when the oxygen generator (4) is last switched, and when the oxygen generator (4) switches from the adsorption operation of tower C to the adsorption operation of tower D for the last time, the exhaust component is first disconnected, so that the tail gas discharged from the oxygen generator (4) enters tower B through the one-way circulation component to pressurize tower B. After a preset time, the ventilation component and the exhaust component are connected, so that the gas in tower C is emptied through the exhaust component, and at the same time, the gas output from the gas outlet (1012) of tower A enters tower B through the ventilation component to pressurize tower B again, so that the pressure in tower B reaches the preset working pressure, and then the adsorption dryer (2) switches from the adsorption operation of tower A to the adsorption operation of tower B. When the pressure of tower A drops to zero, the exhaust component is disconnected, so that the tail gas of the oxygen generator (4) enters tower A through the one-way circulation component to regenerate tower A. When the oxygen generator (4) switches from tower C to tower D for adsorption at other times, the ventilation component and the exhaust component are first disconnected, and the pressure is equalized from tower C to tower D. When the pressure of tower D reaches the predetermined working pressure, the exhaust component is first connected to quickly reduce the pressure of tower C to zero, and then the exhaust component is closed and the ventilation component is opened at the same time, so that the exhaust gas discharged from the self-made oxygen generator (4) continues to enter tower B through the one-way flow component to regenerate tower B.

9. The oxygen production method according to claim 8, characterized in that: The preset time is less than S2 / 20.

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