Pressure swing adsorption oxygen generator

Abstract

The utility model discloses a pressure swing adsorption oxygen generator, which relates to the technical field of pressure swing adsorption oxygen generators and comprises an oxygen storage tank, a clean air storage tank and a process tank. The oxygen storage tank is respectively connected with the tower A and the tower B through connecting pipes; a four-way cavity is arranged on a connecting pipe between the oxygen storage tank and the tower A and a connecting pipe between the oxygen storage tank and the tower B. When the unit runs to the balance process, gas is taken from an outlet above the tower A and passes through the tower A current-limiting flange, the tower B pressure-equalizing pneumatic valve is opened, and when the gas passes through the four-way cavity between the tower A current-limiting flange and the tower B current-limiting flange, one path of gas flows to an outlet of the tower B from the tower B current-limiting flange, and the other path of gas flows to an outlet of the tower B from the tower B current-limiting flange. And the other path is guided to an air inlet of the tower B through a pipeline where the pressure equalizing pneumatic valve of the tower B is located, due to the existence of the flow limiting orifice plate, most of the total balance air quantity is guided to the bottom of the tower B, a large amount of balance air moves from bottom to top when entering the bottom of the tower B, and due to the deceleration effect of the flow limiting plate, the balanced compressed air has sufficient time to be adsorbed by a bed layer.

Description

Technical Field

[0001] This utility model specifically relates to the field of pressure swing adsorption (PSA) oxygen generator technology, and specifically to a PSA oxygen generator. Background Technology

[0002] A pressure swing adsorption (PSA) oxygen generator is a device that uses PSA technology to separate oxygen from the air. PSA oxygen generator technology is relatively mature in China, and the mainstream pressure equalization method currently used is a two-stage equalization method. This involves equalizing the pressure from the adsorption tower outlet to the adsorption tower outlet (upper equalization) and simultaneously equalizing the pressure from the adsorption tower inlet to the adsorption tower inlet (lower equalization). This equalization method is mature, reliable, and widely used.

[0003] During oxygen generator operation, towers A and B work alternately. After one tower becomes saturated, the remaining compressed gas inside the tower is collected through a balancing process and transferred to the other tower for gas reuse and rapid pressurization. The larger the total amount of compressed air transferred to the other tower during balancing, the lower the total compressed air consumption of the oxygen generator, resulting in greater energy savings. However, in actual operation, the amount of compressed air transferred from one tower to another for balancing is limited. Excessive balancing gas will lead to a decrease in adsorption efficiency in the other tower (mainly because the nitrogen content in the compressed air introduced into the tower at the end of the balancing process is too high; the high-concentration nitrogen cannot be adsorbed by the molecular sieve bed in time, resulting in a lower oxygen concentration output during subsequent adsorption. During commissioning, to meet performance standards, the amount of compressed air during balancing must be reduced to satisfy process requirements). This increases the air-to-oxygen ratio and overall power consumption, which is detrimental to cost control for the enterprise. Utility Model Content

[0004] The purpose of this invention is to provide a pressure swing adsorption (PSA) oxygen generator. In this structure, gas is drawn from the top of tower A. At the end of adsorption in each tower, the oxygen content in the enriched gas mixture at the top is the highest. This results in a higher oxygen content in the compressed air supplied to tower B compared to previous processes. During the adsorption process in tower B, a higher flow rate is achieved while consuming less compressed air to produce the same concentration of finished oxygen, thus saving energy and electricity. Because the two adsorption towers of the PSA oxygen generator operate alternately, a balancing process is performed on tower A when tower B finishes adsorption, thereby solving the problems mentioned in the background technology.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] A pressure swing adsorption oxygen generator includes an oxygen storage tank, a clean air storage tank, and a process tank; the oxygen storage tank is connected to tower A and tower B respectively via connecting pipes; a four-way cavity is provided on the connecting pipe between the oxygen storage tank and towers A and B, and two outlets of the four-way cavity are connected to towers A and B respectively via flow limiting flanges of tower A and tower B.

[0007] The connecting pipe between the oxygen storage tank and towers A and B is equipped with a gas backflush check valve, a gas backflush ball valve, and an outlet control shut-off valve.

[0008] As a further technical solution of this utility model, an air exhaust valve, an air inlet valve, an equalizing valve, and an outlet valve for tower A are provided between the connecting pipe and tower A; an air exhaust valve, an air inlet valve, an equalizing valve, and an outlet valve for tower B are provided between the connecting pipe and tower B.

[0009] As a further technical solution of this utility model, the air exhaust valve, air inlet valve, and pressure equalization valve of tower A, as well as the air exhaust valve, air inlet valve, and pressure equalization valve of tower B, are installed on the pipeline that is divided by the four-way cavity.

[0010] As a further technical solution of this utility model, the connecting pipe is also connected to the equipment flow control instrument; the equipment flow control instrument is connected to a non-conforming gas venting valve through a pipe.

[0011] As a further technical solution of this utility model, an air dryer is also installed on the base on which the oxygen storage tank, clean air storage tank, process tank, and tower A and tower B are mounted; the air dryer has an air inlet and an air outlet at the top; wherein the air inlet and air outlet are respectively connected to an air foreign matter filter; the air foreign matter filter is connected to the process tank through a connecting pipe, and a process tank control pneumatic valve is installed on the connecting pipe.

[0012] As a further technical solution of this utility model, the connecting pipe between tower A and tower B is also equipped with an upper pressure equalization shut-off valve, an AB venting control pneumatic valve, and a main inlet balloon valve.

[0013] As a further technical solution of this utility model, the connecting pipe of the clean air storage tank is provided with a finished air supply pneumatic valve and a finished air sterilization filter.

[0014] Compared with the prior art, the beneficial effects of this utility model are:

[0015] This invention draws gas from the top of tower A. At the end of each adsorption tower's adsorption process, the oxygen content in the enriched mixed gas at the top is the highest. This results in a higher oxygen content in the compressed air supplied to tower B compared to previous processes. Furthermore, during the adsorption process in tower B, a higher flow rate is achieved while consuming less compressed air, resulting in energy savings. Since the two adsorption towers of the pressure swing adsorption oxygen generator operate alternately, a balancing process is performed on tower A when tower B's adsorption process ends, maintaining the same process. Attached Figure Description

[0016] Figure 1 This is a top view of the present invention.

[0017] Figure 2 This utility model Figure 1 The main view.

[0018] Figure 3 This utility model Figure 1 Side view.

[0019] Figure 4 This utility model Figure 1 Another perspective structural diagram.

[0020] Figure 5 This utility model Figure 2 Enlarged view of the local structure at point A in the middle.

[0021] In the diagram: 1-Tower A exhaust pneumatic valve, 2-Tower B exhaust pneumatic valve, 3-Tower A inlet pneumatic valve, 4-Tower B inlet pneumatic valve, 5-Tower A equalizing pressure pneumatic valve, 6-Tower B equalizing pressure pneumatic valve, 7-Finished gas supply pneumatic valve, 8-Unqualified gas venting pneumatic valve, 9-Tower A flow-limiting flange, 10-Upper equalizing shut-off valve, 11-Tower B flow-limiting flange, 12-AB exhaust control main pneumatic valve, 13-Process tank control pneumatic valve, 14-Tower B outlet... Pneumatic valve, 15-A Tower outlet pneumatic valve, 16-Main inlet ball valve, 17-Gas backflush check valve, 18-Gas backflush ball valve, 19-Outlet control shut-off valve, 20-Waste venting silencer, 21-Oxygen storage tank, 22-Clean air storage tank, 23-Process tank, 24-Finished product gas sterilization filter, 25-Equipment flow control instrument, 26-Air foreign matter filter, 27-Air dryer, 28-Connecting pipe. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-5 In this embodiment of the present invention, a pressure swing adsorption oxygen generator includes an oxygen storage tank 21, a clean air storage tank 22, and a process tank 23; the oxygen storage tank 21 is connected to tower A and tower B respectively via connecting pipes 28; a four-way cavity is provided on the connecting pipes 28 between the oxygen storage tank 21 and towers A and B, and two outlets of the four-way cavity are connected to towers A and B respectively via flow limiting flanges 9 and 11 of tower B;

[0024] The oxygen storage tank 21 is connected to tower A and tower B by a gas backflush check valve 17, a gas backflush ball valve 18 and an outlet control shut-off valve 19 on the connecting pipe 28.

[0025] The connecting pipe 28 is provided with an A-tower exhaust pneumatic valve 1, an A-tower inlet pneumatic valve 3, an A-tower equalization pneumatic valve 5, and an A-tower outlet pneumatic valve 15 between the connecting pipe 28 and tower A; the connecting pipe 28 is provided with a B-tower exhaust pneumatic valve 2, a B-tower inlet pneumatic valve 4, a B-tower equalization pneumatic valve 6, and a B-tower outlet pneumatic valve 14 between the connecting pipe 28 and tower B.

[0026] By adopting the above technical solution, when the unit reaches the balancing process, gas is taken from the outlet at the top of tower A, passes through the flow-limiting flange 9 of tower A, and the pressure equalization pneumatic valve 6 of tower B is opened. When the gas passes through the four-way cavity between the flow-limiting flange 9 of tower A and the flow-limiting flange 11 of tower B, one path flows from the flow-limiting flange 11 of tower B to the outlet of tower B, and the other path is guided to the air inlet of tower B through the pipeline where the pressure equalization pneumatic valve 6 of tower B is located. Among them, due to the presence of the flow-limiting orifice plate, most of the total balancing gas volume is guided to the bottom of tower B. When a large amount of balancing gas enters the bottom of tower B, it moves from bottom to top, and due to the deceleration effect of the flow-limiting plate, the compressed air being balanced has sufficient time to be adsorbed by the bed.

[0027] In this embodiment, the air exhaust valve 1, air inlet valve 3, and pressure equalization valve 5 of tower A, as well as the air exhaust valve 2, air inlet valve 4, and pressure equalization valve 6 of tower B, are installed on the pipeline that is divided by the four-way cavity.

[0028] The connecting pipe 28 is also connected to the equipment flow control instrument 25; the equipment flow control instrument 25 is connected to the non-conforming gas venting valve 8 via a pipe.

[0029] An air dryer refrigerated dryer 27 is also installed on the base of the oxygen storage tank 21, clean air storage tank 22, process tank 23, and towers A and B. The air dryer refrigerated dryer 27 has an air inlet and an air outlet at the top. The air inlet and air outlet are respectively connected to an air foreign matter filter 26. The air foreign matter filter 26 is connected to the process tank 23 through a connecting pipe 28, and a process tank control pneumatic valve 13 is installed on the connecting pipe 28.

[0030] By adopting the above technical solution, gas is drawn from the top of tower A. At the end of adsorption in each tower, the oxygen content in the enriched mixed gas at the top is the highest. This results in a higher oxygen content in the compressed air supplied to tower B compared to previous processes. During the adsorption process in tower B, a higher flow rate can be obtained while consuming less compressed air to achieve the same oxygen concentration in the finished oxygen product, thus achieving energy saving and power conservation.

[0031] In this embodiment, the connecting pipe 28 between tower A and tower B is also equipped with an upper pressure equalization shut-off valve 10, an AB venting control pneumatic valve 12, and a main inlet balloon valve 16.

[0032] The clean air storage tank 22 is equipped with a finished air supply pneumatic valve 7 and a finished air sterilization filter 24 on its connecting pipe 28.

[0033] By adopting the above technical solution, since the two adsorption towers of the pressure swing adsorption oxygen generator work alternately, when the adsorption in tower B ends, it will perform a balancing process to tower A, and the process is the same; similarly, when adsorption tower B is working, all symmetrical parts are reversed.

[0034] The working principle of this utility model is as follows: When the unit reaches the balancing process, gas is taken from the outlet above tower A, passes through the flow limiting flange 9 of tower A, and the pressure equalization pneumatic valve 6 of tower B is opened. When the gas passes through the four-way cavity between the flow limiting flange 9 of tower A and the flow limiting flange 11 of tower B, one path flows from the flow limiting flange 11 of tower B to the outlet of tower B, and the other path is guided to the air inlet of tower B through the pipeline where the pressure equalization pneumatic valve 6 of tower B is located. Among them, due to the presence of the flow limiting orifice plate, most of the total balancing gas volume is guided to the bottom of tower B. When a large amount of balancing gas enters the bottom of tower B, it moves from bottom to top, and due to the deceleration effect of the flow limiting plate, the compressed air being balanced has sufficient time to be adsorbed by the bed.

[0035] Gas is drawn from the top of tower A. At the end of each adsorption tower, the oxygen content in the enriched mixed gas at the top is the highest. This results in a higher oxygen content in the compressed air supplied to tower B compared to the previous process. When tower B is in the adsorption process, it can output the same concentration of finished oxygen while obtaining a larger flow rate and consuming less compressed air, thus achieving energy saving.

[0036] Since the two adsorption towers of the pressure swing adsorption oxygen generator work alternately, when the adsorption in tower B ends, it will perform a balancing process to tower A, and the process is the same; similarly, when adsorption tower B is working, all symmetrical parts are reversed.

[0037] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0038] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A pressure swing adsorption oxygen generator, characterized in that: It includes an oxygen storage tank (21), a clean air storage tank (22), and a process tank (23); the oxygen storage tank (21) is connected to tower A and tower B respectively through connecting pipes (28); a four-way cavity is provided on the connecting pipes (28) between the oxygen storage tank (21) and tower A and tower B, and two outlets of the four-way cavity are connected to tower A and tower B respectively through the flow limiting flange (9) of tower A and the flow limiting flange (11) of tower B; The oxygen storage tank (21) is equipped with a gas backflush check valve (17), a gas backflush ball valve (18), and an outlet control shut-off valve (19) on the connecting pipe (28) between tower A and tower B. The connecting pipe (28) is provided with an A-tower exhaust pneumatic valve (1), an A-tower inlet pneumatic valve (3), an A-tower equalization pneumatic valve (5), and an A-tower outlet pneumatic valve (15) between the connecting pipe (28) and tower A; the connecting pipe (28) is provided with a B-tower exhaust pneumatic valve (2), a B-tower inlet pneumatic valve (4), a B-tower equalization pneumatic valve (6), and a B-tower outlet pneumatic valve (14) between the connecting pipe (28) and tower B. The A tower exhaust air valve (1), A tower inlet air valve (3), A tower equalizing air valve (5), B tower exhaust air valve (2), B tower inlet air valve (4), and B tower equalizing air valve (6) are installed on the pipeline that is divided by the four-way cavity.

2. The pressure swing adsorption oxygen generator according to claim 1, characterized in that: The connecting pipe (28) is also connected to the equipment flow control instrument (25); the equipment flow control instrument (25) is connected to the non-conforming gas venting valve (8) through a pipe.

3. The pressure swing adsorption oxygen generator according to claim 2, characterized in that: An air dryer (27) is also installed on the base of the oxygen storage tank (21), clean air storage tank (22), process tank (23), and towers A and B. The air dryer (27) has an air inlet and an air outlet at the top. The air inlet and air outlet are connected to an air foreign matter filter (26). The air foreign matter filter (26) is connected to the process tank (23) through a connecting pipe (28), and a process tank control pneumatic valve (13) is installed on the connecting pipe (28).

4. The pressure swing adsorption oxygen generator according to claim 1, characterized in that: The connecting pipe (28) between tower A and tower B is also equipped with an upper equalization shut-off valve (10), an AB venting control pneumatic valve (12), and a main inlet balloon valve (16).

5. A pressure swing adsorption oxygen generator according to claim 1, characterized in that: The clean air storage tank (22) is equipped with a finished air supply pneumatic valve (7) and a finished air sterilization filter (24) on the connecting pipe (28).

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