Air separation diffused oxygen recovery device

Abstract

The utility model provides an air separation diffused oxygen recovery device, which belongs to the technical field of oxygen recovery and comprises an oxygen storage tank, an exhaust component, a heat exchange tower body and a collecting component. An air inlet is formed in the top of the oxygen storage tank; the exhaust assembly is arranged in the oxygen storage tank and is arranged between the air inlet and the air outlet; when the oxygen content in the oxygen storage tank is accumulated to a preset value, the exhaust assembly is used for communicating the air inlet with the air outlet; the top of the heat exchange tower body is provided with an oxygen inlet and a liquid nitrogen inlet, and the bottom is provided with a liquid oxygen outlet and a nitrogen outlet; an oxygen channel communicated with the oxygen inlet and the liquid oxygen outlet and a nitrogen channel communicated with the liquid nitrogen inlet and the nitrogen outlet are arranged in the heat exchange tower body; the oxygen inlet is communicated with the air outlet; the collecting assembly comprises a nitrogen storage part and a liquid oxygen storage part. The air separation diffused oxygen recovery device provided by the utility model can be reasonably configured according to the amount of oxygen discharged by an air separation device, so that the storage and recovery cost is reduced.

Description

Technical Field

[0001] The utility model belongs to the technical field of oxygen recovery, and more specifically relates to an air separation diffused oxygen recovery device. Background Art

[0002] Air separation unit is abbreviated as air separation unit, which refers to a set of industrial equipment used to separate the various components of gas in the air to produce oxygen, nitrogen, argon, etc. When using air separation unit to produce oxygen, in order to balance the pressure inside the air separation unit, the excess oxygen inside the air separation unit needs to be discharged.

[0003] If the excess oxygen is directly discharged into the air, it will cause a waste of resources. Therefore, it is necessary to recycle the excess oxygen through a recovery device. In the prior art, the excess oxygen is usually collected and completely converted into liquid oxygen for storage in a liquid oxygen storage tank; however, when the excess oxygen is directly converted into liquid oxygen, sufficient liquid nitrogen is also required for heat exchange, which makes the recovery and storage costs high. Utility Model Content

[0004] The utility model aims to provide an air separation oxygen recovery device, aiming to solve the technical problem that the existing oxygen recovery device has a simple structure and needs to completely convert excess oxygen into liquid oxygen, resulting in high recovery and storage costs of liquid oxygen.

[0005] In order to achieve the above-mentioned purpose, the technical solution adopted by the utility model is: to provide an air separation oxygen recovery device, comprising:

[0006] The oxygen storage tank has an air inlet at the top and an air outlet at the bottom; the air inlet is used to communicate with the oxygen discharge end of the air separation;

[0007] An exhaust assembly is disposed in the oxygen storage tank and placed between the air inlet and the air outlet; when the oxygen content in the oxygen storage tank accumulates to a preset value, the exhaust assembly is used to connect the air inlet and the air outlet;

[0008] A heat exchange tower body, wherein an oxygen inlet and a liquid nitrogen inlet are respectively provided at the top, and a liquid oxygen outlet and a nitrogen outlet are provided at the bottom; an oxygen channel connected to the oxygen inlet and the liquid oxygen outlet, and a nitrogen channel connected to the liquid nitrogen inlet and the nitrogen outlet are provided inside the heat exchange tower body; the oxygen channel and the nitrogen channel are used to realize heat exchange; the oxygen inlet is connected to the gas outlet; and

[0009] The collecting assembly includes a nitrogen storage component connected to the nitrogen outlet and a liquid oxygen storage component connected to the liquid oxygen outlet.

[0010] In a possible implementation, the exhaust assembly includes:

[0011] A first partition is horizontally arranged in the oxygen storage tank and divides the oxygen storage tank into an upper chamber connected to the air inlet and a lower chamber connected to the air outlet; an exhaust port is provided on the first partition and passes through the upper and lower parts;

[0012] A conical block is slidably disposed at the exhaust port in a vertical direction, and the cross-sectional size of the conical block gradually increases from top to bottom;

[0013] When the oxygen content in the oxygen storage tank accumulates to the preset value, the conical block slides downward, and forms an annular exhaust gap between the outer wall of the conical block and the exhaust port, and the exhaust gap connects the air inlet and the air outlet through the upper cavity and the lower cavity.

[0014] In some embodiments, an elastic member is provided at the bottom of the conical block, and one end of the elastic member is fixedly supported at the bottom of the lower chamber; when the oxygen content in the oxygen storage tank is lower than the preset value, the elastic member seals the conical block at the exhaust port.

[0015] Exemplarily, a guide column is further provided in the oxygen storage tank, and the guide column is vertically penetrated in the exhaust port and the elastic member, and is slidably connected to the conical block in the vertical direction.

[0016] In a possible implementation, the air separation oxygen recovery device further includes a liquid nitrogen component, an inlet end of the liquid nitrogen component is used to communicate with the liquid nitrogen discharge end of the air separation, and an outlet end is connected to the liquid nitrogen inlet for introducing liquid nitrogen into the nitrogen channel.

[0017] In some embodiments, the liquid nitrogen assembly comprises:

[0018] A liquid nitrogen storage tank, wherein the outlet end is provided with a first pipeline connected to the liquid nitrogen inlet; a delivery pump is also provided on the first pipeline;

[0019] a pressure sensor, disposed on the exhaust assembly; and

[0020] A first control valve, disposed on the first pipeline and wirelessly connected to the pressure sensor;

[0021] When the oxygen content in the oxygen storage tank accumulates to the preset value, the pressure sensor obtains pressure information on the exhaust component, and the first control valve opens.

[0022] Exemplarily, a reflux port is further provided at the lower end of the nitrogen storage component, the reflux port is communicated with the first pipeline, and the connecting end of the reflux port and the first pipeline is placed between the first control valve and the liquid nitrogen storage tank.

[0023] In a possible implementation, the liquid oxygen storage component includes an intermediate buffer tank and a liquid oxygen storage tank connected in sequence, and the intermediate buffer tank is in communication with the liquid oxygen outlet.

[0024] In some embodiments, a first air return port is provided on the top of the intermediate buffer tank, a second air return port is provided on the liquid oxygen storage tank, and both the first air return port and the second air return port are connected to the air inlet.

[0025] In a possible implementation, an exhaust pipe with one end open is further provided on the pipeline connecting the oxygen inlet and the air outlet, and a stop valve arranged close to the open end of the exhaust pipe is provided on the exhaust pipe.

[0026] The solution shown in the embodiment of the present application, compared with the prior art, is to arrange an oxygen storage tank in front of the heat exchange tower body to store part of the oxygen, collect a small amount of excess oxygen discharged by the air separation unit in the oxygen storage tank in advance, and when the amount of stored oxygen reaches a preset value, connect the air inlet and the air outlet through the exhaust assembly, so that the excess oxygen is transferred to the heat exchange tower body for heat exchange, and the oxygen in the oxygen channel is heat exchanged with the liquid nitrogen in the nitrogen channel to liquefy the oxygen to form liquid oxygen, and store it in the liquid oxygen storage component, and the nitrogen formed after the heat exchange is stored in the nitrogen storage component; the air separation oxygen recovery device provided in the present application can be reasonably configured according to the amount of oxygen discharged by the air separation unit, so that when the amount of oxygen is small, it is directly stored in the oxygen storage tank in the form of gas, and when the amount of oxygen reaches a preset value, heat exchange is performed to form liquid oxygen storage, thereby reducing the storage and recovery costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 A schematic diagram of the structure of an air separation oxygen recovery device provided in an embodiment of the utility model;

[0029] Figure 2 For attachment Figure 1 Schematic diagram of the enlarged cross-section structure at point A in the middle.

[0030] In the figure:

[0031] 1. Oxygen storage tank; 11. Air inlet; 12. Air outlet; 2. Exhaust assembly; 21. First baffle; 211. Exhaust port; 22. Upper chamber; 23. Lower chamber; 24. Conical block; 25. Elastic member; 26. Guide column; 3. Heat exchange tower body; 31. Oxygen inlet; 32. Liquid nitrogen inlet; 33. Liquid oxygen outlet; 34. Nitrogen outlet; 4. Nitrogen storage component; 41. Reflux port; 5. Liquid oxygen storage component; 51. Intermediate buffer tank; 511. First air return port; 52. Liquid oxygen storage tank; 521. Second air return port; 6. Liquid nitrogen assembly; 61. Liquid nitrogen storage tank; 62. First pipeline; 63. Pressure sensor; 64. First control valve; 65. Delivery pump; 7. Exhaust pipe; 8. Stop valve. DETAILED DESCRIPTION

[0032] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0033] It should be noted that when an element is referred to as being "disposed on" another element, it may be directly on the other element or indirectly on the other element. It should be understood that the terms "length", "width", "upper", "lower", "front", "back", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0034] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "several" is two or more, unless otherwise clearly and specifically defined.

[0035] Please also read Figure 1 and Figure 2The air separation oxygen recovery device provided by the utility model is now described. The air separation oxygen recovery device comprises an oxygen storage tank 1, an exhaust assembly 2, a heat exchange tower body 3 and a collection assembly; an air inlet 11 is provided at the top of the oxygen storage tank 1, and an air outlet 12 is provided at the bottom; the air inlet 11 is used to communicate with the oxygen discharge end of the air separation; the exhaust assembly 2 is provided in the oxygen storage tank 1, and is placed between the air inlet 11 and the air outlet 12; when the oxygen content in the oxygen storage tank 1 accumulates to a preset value, the exhaust assembly 2 is used to connect the air inlet 11 and the air outlet 12; the top of the heat exchange tower body 3 An oxygen inlet 31 and a liquid nitrogen inlet 32 ​​are respectively provided, and a liquid oxygen outlet 33 and a nitrogen outlet 34 are provided at the bottom; an oxygen channel connecting the oxygen inlet 31 and the liquid oxygen outlet 33, and a nitrogen channel connecting the liquid nitrogen inlet 32 ​​and the nitrogen outlet 34 are provided inside the heat exchange tower body 3; the oxygen channel and the nitrogen channel are used to realize heat exchange; the oxygen inlet 31 is connected to the gas outlet 12; the collecting component includes a nitrogen storage component 4 connected to the nitrogen outlet 34, and a liquid oxygen storage component 5 connected to the liquid oxygen outlet 33.

[0036] It should be understood that the oxygen channel and the nitrogen channel are used to achieve heat exchange, and the heat exchange principle and specific structure belong to the prior art and will not be repeated here; heat exchange is performed so that the oxygen entering the oxygen channel exchanges heat with the liquid nitrogen in the nitrogen channel, thereby forming liquid oxygen and nitrogen; the nitrogen storage component 4 is connected to the nitrogen outlet 34 for collecting the nitrogen formed after the heat exchange; the liquid oxygen storage component 5 is connected to the liquid oxygen outlet 33 for collecting the liquid oxygen formed after the heat exchange.

[0037] It should be noted that when the oxygen content in the exhaust component 2 is lower than the preset value, the air inlet 11 and the air outlet 12 of the oxygen storage tank 1 are not connected. At this time, the oxygen is temporarily stored in the oxygen storage tank 1 and does not enter the heat exchange tower body 3; when the oxygen content in the exhaust component 2 is higher than the preset value, the air inlet 11 and the air outlet 12 of the oxygen storage tank 1 are connected, so that the oxygen stored in the oxygen storage tank 1 enters the heat exchange tower body 3 for heat exchange.

[0038] Compared with the prior art, the air separation oxygen recovery device provided by the utility model is provided with an oxygen storage tank 1 in front of the heat exchange tower body 3 to store part of the oxygen, and a small amount of excess oxygen discharged by the air separation device is first collected in the oxygen storage tank 1, and when the amount of stored oxygen reaches a preset value, the air inlet 11 and the air outlet 12 are connected through the exhaust assembly 2, so that the excess oxygen is transferred to the heat exchange tower body 3 for heat exchange, and the oxygen in the oxygen channel is heat exchanged with the liquid nitrogen in the nitrogen channel to liquefy the oxygen to form liquid oxygen, and stored in the liquid oxygen storage component 5, and the nitrogen formed after the heat exchange is stored in the nitrogen storage component 4; the air separation oxygen recovery device provided in the present application can be reasonably configured according to the amount of oxygen discharged by the air separation device, so that when the amount of oxygen is small, it is directly stored in the oxygen storage tank 1 in the form of gas, and when the amount of oxygen reaches a preset value, heat exchange is performed to form liquid oxygen storage, thereby reducing the storage and recovery costs.

[0039] See also Figure 2 In some possible embodiments, the exhaust assembly 2 includes a first partition 21 and a conical block 24; the first partition 21 is horizontally arranged in the oxygen storage tank 1, and divides the oxygen storage tank 1 into an upper chamber 22 connected to the air inlet 11, and a lower chamber 23 connected to the air outlet 12; the first partition 21 is provided with an exhaust port 211 that passes through from top to bottom; the conical block 24 is slidably arranged at the exhaust port 211 along the vertical direction, and the cross-sectional size of the conical block 24 gradually increases from top to bottom; wherein, when the oxygen content in the oxygen storage tank 1 accumulates to a preset value, the conical block 24 slides downward, and a ring-shaped exhaust gap is formed between the outer peripheral wall of the conical block 24 and the exhaust port 211, and the exhaust gap is connected to the air inlet 11 and the air outlet 12 through the upper chamber 22 and the lower chamber 23 respectively.

[0040] The first partition 21 is used to separate the oxygen storage tank 1 into an upper chamber 22 and a lower chamber 23, and to separate the air inlet 11 and the air outlet 12; the exhaust port 211 is used to connect the air inlet 11 and the air outlet 12 through the upper chamber 22 and the lower chamber 23; since a conical block 24 is provided at the exhaust port 211, the upper chamber 22 and the lower chamber 23 are separated when the outer peripheral wall of the conical block 24 is connected to the exhaust port 211. When the conical block 24 slides downward and an annular exhaust gap is formed between the outer peripheral wall of the conical block 24 and the exhaust port 211, the upper chamber 22 and the lower chamber 23 are connected, and the air inlet 11 and the air outlet 12 are connected, so that the oxygen stored in the upper chamber 22 enters the heat exchange tower body 3 below through the lower chamber 23 and the air outlet 12, thereby performing the oxygen heat exchange step to liquefy and form liquid oxygen.

[0041] It should be understood that, since the cross-sectional size of the conical block 24 gradually increases from top to bottom, when the conical block 24 slides downward, the annular gap between the conical block 24 and the exhaust port 211 gradually increases.

[0042] In addition, a pressure sensor 63 is also provided on the conical block 24; the pressure sensor 63 on the conical block 24 is used to detect the pressure value of the oxygen stored in the upper chamber 22, and the working principle and specific structure of the pressure sensor 63 belong to the prior art and will not be repeated here.

[0043] See also Figure 2 In some embodiments, an elastic member 25 is provided at the bottom of the conical block 24, and one end of the elastic member 25 is fixedly supported at the bottom of the lower chamber 23; when the oxygen content in the oxygen storage tank 1 is lower than a preset value, the elastic member 25 blocks the conical block 24 at the exhaust port 211.

[0044] By providing the elastic member 25 , when the gas pressure in the upper chamber 22 is less than a preset value, the conical block 24 is driven to reset to eliminate the exhaust gap and block the exhaust port 211 , so that oxygen continues to be stored in the upper chamber 22 .

[0045] See also Figure 2 Exemplarily, a guide column 26 is further provided in the oxygen storage tank 1. The guide column 26 penetrates the exhaust port 211 and the elastic member 25 in the vertical direction, and is slidably connected to the conical block 24 in the vertical direction.

[0046] The guide column 26 is provided to allow the conical block 24 to slide up and down along the axial direction of the guide column 26 , thereby preventing the conical block 24 from deviating from the preset track when sliding up and down, thereby preventing the exhaust port 211 from being poorly blocked.

[0047] It should be understood that in order to avoid mutual interference between the guide column 26 and the air inlet 11 and the air outlet 12 , the air inlet 11 and the air outlet 12 may be disposed at the radial outer edge of the guide column 26 .

[0048] See also Figure 1 In some possible embodiments, the air separation oxygen recovery device further includes a liquid nitrogen component 6, the inlet end of the liquid nitrogen component 6 is used to communicate with the liquid nitrogen discharge end of the air separation, and the outlet end is connected to the liquid nitrogen inlet 32 ​​for introducing liquid nitrogen into the nitrogen channel.

[0049] The liquid nitrogen component 6 is provided to collect the liquid nitrogen component of the air separation device, and the liquid nitrogen is transported to the heat exchange tower body 3 to perform heat exchange with oxygen, thereby realizing liquefied oxygen storage.

[0050] See also Figure 1In some embodiments, the liquid nitrogen component 6 includes a liquid nitrogen storage tank 61, a pressure sensor 63 and a first control valve 64; the outlet end of the liquid nitrogen storage tank 61 is provided with a first pipeline 62 connected to the liquid nitrogen inlet 32; a delivery pump 65 is also provided on the first pipeline 62; the pressure sensor 63 is provided on the exhaust component 2; the first control valve 64 is provided on the first pipeline 62 and is wirelessly connected to the pressure sensor 63; wherein, when the oxygen content in the oxygen storage tank 1 accumulates to a preset value, the pressure sensor 63 obtains the pressure information on the exhaust component 2, and the first control valve 64 opens.

[0051] Specifically, the pressure sensor 63 is disposed on the conical block 24 of the exhaust assembly 2 to monitor the oxygen pressure value in the upper chamber 22; and when the oxygen pressure value in the upper chamber 22 reaches a preset value, the first control valve 64 is opened so that the delivery pump 65 inputs liquid nitrogen into the heat exchange tower body 3. It should be understood that the wireless connection between the first control valve 64 and the pressure sensor 63 is a prior art and will not be described in detail herein.

[0052] The delivery pump 65 is used to deliver the liquid nitrogen in the liquid nitrogen storage tank 61 to the first pipeline 62 , and then deliver it to the heat exchange tower body 3 via the first pipeline 62 .

[0053] See also Figure 1 Exemplarily, a reflux port 41 is further provided at the lower end of the nitrogen storage component 4 , the reflux port 41 is connected to the first pipeline 62 , and the connecting end of the reflux port 41 and the first pipeline 62 is placed between the first control valve 64 and the liquid nitrogen storage tank 61 .

[0054] Liquid nitrogen forms nitrogen after heat exchange with oxygen. However, when the heat exchange is insufficient or the flow rate of the delivered liquid nitrogen is greater than the required amount, some liquid nitrogen may remain. At this time, the excess liquid nitrogen can be guided out through the reflux port 41 and refluxed into the first pipeline 62 at the inlet end of the heat exchange tower body 3 to realize the recycling of liquid nitrogen.

[0055] See also Figure 1 In some possible embodiments, the liquid oxygen storage component 5 includes an intermediate buffer tank 51 and a liquid oxygen storage tank 52 connected in sequence, and the intermediate buffer tank 51 is connected to the liquid oxygen outlet 33.

[0056] An intermediate buffer tank 51 is provided to buffer the liquid oxygen formed after the heat exchange, and after the pressure and flow rate of the liquid oxygen are stabilized, the liquid oxygen is transported to the liquid oxygen storage tank 52 for storage.

[0057] See also Figure 1 In some embodiments, a first air return port 511 is provided on the top of the intermediate buffer tank 51 , a second air return port 521 is provided on the liquid oxygen storage tank 52 , and both the first air return port 511 and the second air return port 521 are connected to the air inlet 11 .

[0058] Liquid oxygen is formed after heat exchange with liquid nitrogen. However, when the heat exchange is insufficient, or the oxygen flow rate delivered is higher than the amount that can be converted, some oxygen will remain. When liquid oxygen is stored in the intermediate buffer tank 51 and the liquid oxygen storage tank 52 for a long time, some liquid oxygen will vaporize again to form oxygen. To avoid the waste of this part of oxygen, the excess oxygen can be recovered to the oxygen storage tank 1 through the first return air port 511 and the second return air port 521 to avoid waste.

[0059] See also Figure 1 In some possible embodiments, an exhaust pipe 7 with one end open is further provided on the pipeline connecting the oxygen inlet 31 and the gas outlet 12 , and a stop valve 8 is provided on the exhaust pipe 7 near the open end of the exhaust pipe 7 .

[0060] By providing the exhaust pipe 7 and the stop valve 8, the air in the oxygen storage tank 1 can be discharged before the oxygen is transported into the oxygen storage tank 1, so as to avoid the residual air affecting the quality of the oxygen.

[0061] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. Air separation oxygen recovery device, characterized in that: include: An oxygen storage tank (1) is provided with an air inlet (11) at the top and an air outlet (12) at the bottom; the air inlet (11) is used to communicate with the oxygen discharge end of the air separation; An exhaust component (2) is arranged in the oxygen storage tank (1) and is placed between the air inlet (11) and the air outlet (12); when the oxygen content in the oxygen storage tank (1) accumulates to a preset value, the exhaust component (2) is used to connect the air inlet (11) and the air outlet (12); The heat exchange tower body (3) is provided with an oxygen inlet (31) and a liquid nitrogen inlet (32) at the top, and a liquid oxygen outlet (33) and a nitrogen outlet (34) at the bottom; an oxygen channel communicating with the oxygen inlet (31) and the liquid oxygen outlet (33), and a nitrogen channel communicating with the liquid nitrogen inlet (32) and the nitrogen outlet (34) are provided inside the heat exchange tower body (3); the oxygen channel and the nitrogen channel are used to achieve heat exchange; the oxygen inlet (31) is communicated with the gas outlet (12); and The collecting assembly comprises a nitrogen storage component (4) connected to the nitrogen outlet (34), and a liquid oxygen storage component (5) connected to the liquid oxygen outlet (33).

2. The air separation oxygen recovery device according to claim 1, characterized in that: The exhaust assembly (2) comprises: a first partition (21) arranged horizontally in the oxygen storage tank (1) and dividing the oxygen storage tank (1) into an upper chamber (22) communicating with the air inlet (11) and a lower chamber (23) communicating with the air outlet (12); the first partition (21) is provided with an exhaust port (211) extending vertically; A conical block (24) is slidably disposed at the exhaust port (211) in a vertical direction, and the cross-sectional size of the conical block (24) gradually increases from top to bottom; When the oxygen content in the oxygen storage tank (1) accumulates to the preset value, the conical block (24) slides downward, and forms an annular exhaust gap between the outer peripheral wall of the conical block (24) and the exhaust port (211), and the exhaust gap is connected to the air inlet (11) and the air outlet (12) via the upper chamber (22) and the lower chamber (23).

3. The air separation oxygen recovery device according to claim 2, characterized in that: An elastic member (25) is provided at the bottom of the conical block (24), and one end of the elastic member (25) is fixedly supported at the bottom of the lower chamber (23); when the oxygen content in the oxygen storage tank (1) is lower than the preset value, the elastic member (25) blocks the conical block (24) at the exhaust port (211).

4. The air separation oxygen recovery device according to claim 3, characterized in that: A guide column (26) is also provided in the oxygen storage tank (1). The guide column (26) is vertically inserted into the exhaust port (211) and the elastic member (25), and is slidably connected to the conical block (24) in the vertical direction.

5. The air separation oxygen recovery device according to claim 1, characterized in that: The air separation oxygen recovery device further comprises a liquid nitrogen component (6), the inlet end of the liquid nitrogen component (6) being connected to the liquid nitrogen discharge end of the air separation, and the outlet end being connected to the liquid nitrogen inlet (32) for introducing liquid nitrogen into the nitrogen channel.

6. The air separation oxygen recovery device according to claim 5, characterized in that: The liquid nitrogen assembly (6) comprises: A liquid nitrogen storage tank (61), wherein the outlet end is provided with a first pipeline (62) connected to the liquid nitrogen inlet (32); the first pipeline (62) is also provided with a delivery pump (65); a pressure sensor (63), arranged on the exhaust assembly (2); and a first control valve (64), which is disposed on the first pipeline (62) and is wirelessly connected to the pressure sensor (63); When the oxygen content in the oxygen storage tank (1) accumulates to the preset value, the pressure sensor (63) obtains pressure information on the exhaust component (2), and the first control valve (64) opens.

7. The air separation oxygen recovery device according to claim 6, characterized in that: The nitrogen storage element (4) is further provided with a reflux port (41) at the lower end, the reflux port (41) being in communication with the first pipeline (62), and the connecting end of the reflux port (41) and the first pipeline (62) being disposed between the first control valve (64) and the liquid nitrogen storage tank (61).

8. The air separation oxygen recovery device according to claim 1, characterized in that: The liquid oxygen storage element (5) comprises an intermediate buffer tank (51) and a liquid oxygen storage tank (52) connected in sequence, and the intermediate buffer tank (51) is in communication with the liquid oxygen outlet (33).

9. The air separation oxygen recovery device according to claim 8, characterized in that: The top of the intermediate buffer tank (51) is provided with a first air return port (511), the liquid oxygen storage tank (52) is provided with a second air return port (521), and the first air return port (511) and the second air return port (521) are both in communication with the air inlet (11).

10. The air separation oxygen recovery device according to claim 1, characterized in that: An exhaust pipe (7) with one end open is also provided on the pipeline connecting the oxygen inlet (31) and the gas outlet (12), and a stop valve (8) arranged near the open end of the exhaust pipe (7) is provided on the exhaust pipe (7).

Images