System for producing high-purity oxygen from common oxygen

Abstract

The utility model provides a system for producing high-purity oxygen from common oxygen. The system for producing the high-purity oxygen from the common oxygen comprises a common oxygen source; the catalyst furnace is communicated with the ordinary oxygen gas source and is used for removing combustible components in ordinary oxygen; the rectification cold box is communicated with the catalyst furnace, the rectification cold box comprises a purification rectification tower, a condenser is arranged at the top of the purification rectification tower, an evaporator is arranged at the bottom of the purification rectification tower, in the production process, waste gas is discharged from the top of the purification rectification tower, and high-purity oxygen is discharged from the bottom of the purification rectification tower; and the circulating nitrogen compression part is communicated with the rectification cold box and is used for providing and recovering nitrogen. The system for producing the high-purity oxygen from the common oxygen can solve the problem of how to produce the high-purity oxygen.

Description

Technical Field

[0001] The present application relates to the technical field of high-purity oxygen production, and in particular to a system for producing high-purity oxygen from general oxygen. Background Art

[0002] High-purity oxygen is usually produced by air separation, which removes impurities and improves the purity of oxygen through deep purification, cryogenic distillation and other process flows. Therefore, the production of high-purity oxygen or high-purity liquid oxygen usually requires the use of cryogenic air separation units. However, the cryogenic air separation units currently on the market are mainly used to produce medical oxygen.

[0003] In recent years, the application of high-purity oxygen in various industries has become increasingly widespread. The manufacture of high-performance electronic components requires high-purity oxygen, and the production of polysilicon in the photovoltaic industry also requires high-purity oxygen to remove impurities in polysilicon. With the rapid development of the photovoltaic and electronics industries, there is a gap in the market demand for high-purity oxygen.

[0004] The existing air separation units produce liquid oxygen or gaseous oxygen with an oxygen content of 99.6%. The production scale is large, and the units are all customized for specific gas users. There is no equipment for producing high-purity oxygen. If the existing air separation units are to be renovated, it is necessary to recalculate the unit process, carry out unit renovation design, design and manufacture new equipment, shut down the original equipment for renovation at an appropriate time, and re-commission production verification. The renovation process involves the renovation of instrumentation and electronic control, renovation and maintenance of special equipment, etc. The workload is large and the procedures are complicated, which affects the existing production rhythm. Utility Model Content

[0005] In view of this, the purpose of the present application is to provide a system for producing high-purity oxygen from general oxygen, so as to solve the problem of how to produce high-purity oxygen.

[0006] According to the utility model, a system for producing high-purity oxygen from general oxygen is provided, wherein the system for producing high-purity oxygen from general oxygen comprises: a general oxygen source; a catalyst furnace connected to the general oxygen source and used to remove combustible components in the general oxygen; a distillation cold box connected to the catalyst furnace, the distillation cold box comprising a purification distillation tower, a condenser is provided at the top of the purification distillation tower, and an evaporator is provided at the bottom of the purification distillation tower. During the production process, exhaust gas is discharged from the top of the purification distillation tower, and high-purity oxygen is discharged from the bottom of the purification distillation tower; and a circulating nitrogen compression section connected to the distillation cold box, which is used to provide and recover nitrogen.

[0007] Preferably, the catalyst furnace includes: a regenerator connected to the general oxygen source; a heater connected to the regenerator; a catalytic reactor, one end of the catalytic reactor is connected to the heater, and the other end of the catalytic reactor is connected to the regenerator; and a first cooler, the regenerator is connected to the first cooler, and the first cooler is connected to the distillation cold box.

[0008] Preferably, the catalyst furnace also includes: a first passage connecting the first cooler and the distillation cold box, the first passage being provided with a first molecular sieve adsorber; and a second passage being provided in parallel with the first passage, the second passage being provided with a second molecular sieve adsorber, the second passage being used alternately with the first passage.

[0009] Preferably, the distillation cold box further comprises a heat exchanger, the catalyst furnace is provided with an oxygen inlet pipe, and the oxygen inlet pipe is connected to the purification distillation tower through the heat exchanger.

[0010] Preferably, the distillation cold box also includes: an exhaust gas pipe, which is connected to the top of the purification distillation tower through the heat exchanger; a liquid high-purity oxygen pipe, which is connected to the bottom of the purification distillation tower, and the liquid high-purity oxygen is discharged through the liquid high-purity oxygen pipe; and a gaseous high-purity oxygen pipe, which is equipped with a liquid oxygen pump and is connected to the bottom of the purification distillation tower through the heat exchanger, and the gaseous high-purity oxygen is discharged through the gaseous high-purity oxygen pipe.

[0011] Preferably, the circulating nitrogen compression section comprises: a nitrogen inlet pipe, which is connected to the bottom of the purification distillation tower through the heat exchanger and is used to provide nitrogen to the distillation cold box; and a nitrogen outlet pipe, which is connected to the top of the purification distillation tower through the heat exchanger and is used to recover the nitrogen in the distillation cold box.

[0012] Preferably, the circulating nitrogen compression unit further includes: a circulating hydraulic machine connected to the nitrogen outlet pipe; and a second cooler, the circulating hydraulic machine connected to the second cooler, and the second cooler connected to the nitrogen inlet pipe.

[0013] Preferably, the system for producing high-purity oxygen from general oxygen also includes: a liquid nitrogen replenishing pipe connected to the top of the purification distillation tower; and a liquid nitrogen pipe, the liquid nitrogen pipe connecting the top and bottom of the purification distillation tower, and the liquid nitrogen pipe is equipped with a throttle valve.

[0014] Preferably, the general oxygen source comprises a liquid oxygen tank, the liquid oxygen tank is connected to the catalyst furnace via a liquid oxygen pipeline, and the liquid oxygen pipeline is equipped with a liquid oxygen pump.

[0015] Preferably, the general oxygen source includes an oxygen pipeline, and the oxygen pipeline is connected to the catalyst furnace.

[0016] The utility model discloses a system for producing high-purity oxygen from general oxygen, wherein a general oxygen source can be general oxygen produced by an existing air separation device, a catalyst furnace is connected to the general oxygen source and is used to remove combustible components such as hydrocarbons and hydrogen in the general oxygen, a distillation cold box is connected to the catalyst furnace, and the general oxygen that has undergone a catalytic reaction in the catalyst furnace enters the distillation cold box, and the distillation cold box includes a purification distillation tower, a condenser is provided at the top of the purification distillation tower, and an evaporator is provided at the bottom of the purification distillation tower. During the high-purity oxygen production process, exhaust gas is discharged from the top of the purification distillation tower, and high-purity oxygen is discharged from the bottom of the purification distillation tower to obtain high-purity oxygen, and a circulating nitrogen compression unit is connected to the distillation cold box and is used to provide and recover nitrogen, and the heat load of the evaporator in the purification distillation tower is provided by the circulating nitrogen, so that the problem of how to produce high-purity oxygen can be effectively solved.

[0017] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0019] Figure 1 It is a schematic diagram of a system for producing high-purity oxygen from general oxygen according to the utility model.

[0020] Figure 2 It is a schematic diagram of part of a system for producing high-purity oxygen from general oxygen according to the utility model.

[0021] Figure 3 It is a schematic diagram of another part of the system for producing high-purity oxygen from general oxygen according to the utility model.

[0022] Figure numerals: 1-catalyst furnace; 11-regenerator; 12-heater; 13-catalytic reactor; 14-first cooler; 15-first passage; 150-first molecular sieve adsorber; 16-second passage; 160-second molecular sieve adsorber; 2-distillation cold box; 20-purification distillation tower; 201-condenser; 202-evaporator; 21-heat exchanger; 22-liquid high-purity oxygen pipe; 23-gaseous high-purity oxygen pipe; 3-circulating nitrogen compression section; 31-nitrogen inlet pipe; 32-nitrogen outlet pipe; 33-circulating hydraulic press; 34-second cooler; 4-liquid oxygen pump; 5-oxygen inlet pipe; 6-exhaust pipe; 7-liquid nitrogen replenishing pipe; 8-liquid nitrogen pipe; 80-throttle valve; 91-liquid oxygen tank; 92-oxygen pipeline. DETAILED DESCRIPTION

[0023] The following specific embodiments are provided to help the reader obtain a comprehensive understanding of the methods, devices and / or systems described herein. However, after understanding the disclosure of the present application, various changes, modifications and equivalents of the methods, devices and / or systems described herein will be apparent. For example, the order of operations described herein is merely an example, and is not limited to the order set forth herein, but in addition to the operations that must occur in a particular order, changes that will be apparent after understanding the disclosure of the present application may be made. In addition, in order to improve clarity and brevity, descriptions of features known in the art may be omitted.

[0024] The features described herein may be implemented in different forms and should not be interpreted as being limited to the examples described herein. Rather, the examples described herein have been provided only to illustrate some of the many possible ways of implementing the methods, devices and / or systems described herein that will be apparent after understanding the disclosure of the present application.

[0025] Throughout the specification, when an element (such as a layer, a region, or a substrate) is described as being “on”, “connected to”, “bound to”, “over”, or “covering” another element, it may be directly “on”, “connected to”, “bound to”, “over”, or “covering” another element, or one or more other elements may be present between them. In contrast, when an element is described as being “directly on”, “directly connected to”, “directly bound to”, “directly over”, or “directly covering” another element, there may be no other elements present between them.

[0026] As used herein, the term "and / or" includes any one of the associated listed items and any combination of any two or more items.

[0027] Although terms such as "first," "second," and "third" may be used herein to describe various members, components, regions, layers, or portions, these members, components, regions, layers, or portions are not limited by these terms. Rather, these terms are only used to distinguish one member, component, region, layer, or portion from another member, component, region, layer, or portion. Therefore, without departing from the teachings of the examples described herein, the first member, component, region, layer, or portion referred to may also be referred to as the second member, component, region, layer, or portion.

[0028] For ease of description, spatial relational terms such as "above", "upper", "below", and "lower" may be used herein to describe the relationship of one element to another element as shown in the accompanying drawings. Such spatial relational terms are intended to include different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. For example, if the device in the accompanying drawings is turned over, an element described as being "above" or "upper" relative to another element will subsequently be "below" or "lower" relative to the other element. Therefore, the term "above" includes both "above" and "below" orientations depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., rotated 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly.

[0029] The terms used herein are only used to describe various examples and are not used to limit the examples. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "include", "comprising" and "having" list the existence of the stated features, quantities, operations, components, elements and / or their combinations, but do not exclude the existence or addition of one or more other features, quantities, operations, components, elements and / or their combinations.

[0030] Variations in the shapes shown in the drawings may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the drawings but include variations in shapes that occur during manufacturing.

[0031] The features of the examples described herein may be combined in various ways that will be apparent after understanding the disclosure of the present application. In addition, although the examples described herein have various configurations, other configurations are possible as will be apparent after understanding the disclosure of the present application.

[0032] The utility model provides a system for producing high-purity oxygen from general oxygen, such as Figure 3 As shown, the system for producing high-purity oxygen from general oxygen includes a catalyst furnace 1, a distillation cold box 2 and a circulating nitrogen compression unit 3.

[0033] In the following description, reference will be made to Figures 1 to 3 The specific structure of the above components of the system for producing high-purity oxygen from general oxygen and the connection relationship of the above components are specifically described.

[0034] like Figures 1 to 3 As shown, in the embodiment, the general oxygen source can be connected to the catalyst furnace 1 through a pipeline to provide general oxygen to the catalyst furnace 1. The general oxygen source can be general oxygen produced by an existing air separation device. The catalyst furnace 1 is used to remove combustible components such as hydrocarbons and hydrogen in the general oxygen. The distillation cold box 2 can be connected to the catalyst furnace 1, and the general oxygen enters the distillation cold box 2 after the catalytic reaction in the catalyst furnace 1. A purification distillation tower 20 can be provided in the distillation cold box 2. A condenser 201 can be provided at the top of the purification distillation tower 20, and an evaporator 202 is provided at the bottom of the purification distillation tower 20. In the process of high-purity oxygen production, exhaust gas can be discharged from the top of the purification distillation tower 20, and high-purity oxygen can be discharged from the bottom of the purification distillation tower 20, so as to realize the production of high-purity oxygen (oxygen content 99.999%) from general oxygen (oxygen content 99.6%). The circulating nitrogen compression section 3 is connected to the distillation cold box 2 for providing and recovering nitrogen. The heat load of the evaporator 202 in the purification distillation tower 20 is provided by the circulating nitrogen.

[0035] Preferably, Figures 1 to 3 As shown, in an embodiment, the general oxygen source may include a liquid oxygen tank 91. The liquid oxygen tank 91 may be connected to the catalyst furnace 1 through a liquid oxygen pipeline, and the liquid oxygen pipeline may be installed with a liquid oxygen pump 4, and the liquid oxygen in the liquid oxygen tank 91 is transported to the catalyst furnace 1 through the liquid oxygen pump 4. Preferably, the general oxygen source may also include an oxygen pipeline 92, and the oxygen pipeline 92 is connected to the catalyst furnace 1, and is used to provide oxygen to the catalyst furnace 1. The oxygen in the oxygen pipeline 92 may be provided by an air separation device. Only one of the liquid oxygen tank 91 and the oxygen pipeline 92 may be provided, or both may be provided at the same time. If a liquid oxygen tank 91 is provided, the liquid oxygen needs to be pressurized to a supercritical state so that the liquid oxygen is vaporized in a supercritical state to avoid the concentration and aggregation of hydrocarbons.

[0036] Preferably, Figure 1 and Figure 2As shown, in an embodiment, the catalyst furnace 1 may include a regenerator 11, a heater 12 and a catalytic reactor 13. Among them, the regenerator 11 is connected to the general oxygen source. The heater 12 is connected to the regenerator 11. One end of the catalytic reactor 13 is connected to the heater 12, and the other end of the catalytic reactor 13 is connected to the regenerator 11. The general oxygen of the general oxygen source is first transported to the regenerator 11, then enters the heater 12 for heating, and then enters the catalytic reactor 13 to complete the catalytic reaction, remove combustible components such as hydrocarbons and hydrogen, and finally the general oxygen returns to the regenerator 11 to recover waste heat and reduce energy consumption. The regenerator 11 can be connected to the first cooler 14, and the general oxygen after recovering the waste heat enters the first cooler 14 for cooling (the circulating water pipeline can be used to provide cooling). The first cooler 14 can be connected to the distillation cold box 2.

[0037] More preferably, Figure 1 and Figure 2 As shown, in an embodiment, the catalyst furnace 1 may also include a first passage 15 and a second passage 16, wherein the first passage 15 may be connected to the first cooler 14 and the distillation cold box 2. The first passage 15 may be provided with a first molecular sieve adsorber 150 for removing water vapor and carbon dioxide from the general oxygen. The second passage 16 may be arranged in parallel with the first passage 15, that is, the second passage 16 is also connected to the first cooler 14 and the distillation cold box 2. The second passage 16 may be provided with a second molecular sieve adsorber 160 for removing water vapor and carbon dioxide from the general oxygen. Preferably, the first passage 15 and the second passage 16 may be used alternately, and the first molecular sieve adsorber 150 and the second molecular sieve adsorber 160 are designed with a long cycle, and a single adsorption time is greater than 8 hours. A longer cycle can make the equipment run more smoothly and minimize pressure fluctuations during switching.

[0038] Preferably, Figures 1 to 3 As shown, in the embodiment, the distillation cold box 2 may further include a heat exchanger 21. The catalyst furnace 1 may be provided with an oxygen inlet pipe 5. The first end of the oxygen inlet pipe 5 is connected to the first passage 15 and the second passage 16, and the second end of the oxygen inlet pipe 5 is connected to the purification distillation tower 20 through the heat exchanger 21. The general oxygen in the catalyst furnace 1 is transported to the purification distillation tower 20 through the oxygen inlet pipe 5, and during the process, the general oxygen releases heat at the heat exchanger 21.

[0039] More preferably, Figure 1 and Figure 3As shown, in an embodiment, the distillation cold box 2 may further include a waste gas pipe 6, a liquid high-purity oxygen pipe 22, and a gaseous high-purity oxygen pipe 23. After the general oxygen is fractionated by the purification distillation tower 20, the waste gas with unqualified oxygen content is discharged through the waste gas pipe 6. The waste gas pipe 6 may be connected to the top of the purification distillation tower 20 through a heat exchanger 21. During the process of the waste gas being discharged through the waste gas pipe 6, the waste gas absorbs heat when passing through the heat exchanger 21 to achieve the recovery of cold. After the general oxygen is fractionated by the purification distillation tower 20, the liquid high-purity oxygen with qualified purity is discharged from the bottom of the purification distillation tower 20. The liquid high-purity oxygen pipe 22 may be connected to the bottom of the purification distillation tower 20, and the liquid high-purity oxygen may be discharged through the liquid high-purity oxygen pipe 22 and sent to a vacuum storage tank for storage for standby or sale. The gaseous high-purity oxygen pipe 23 can be connected to the bottom of the purification distillation tower 20 through the heat exchanger 21, and a liquid oxygen pump 4 can be arranged between the gaseous high-purity oxygen pipe 23 and the bottom of the purification distillation tower 20. After being pressurized by the liquid oxygen pump 4, the liquid high-purity oxygen is heated by the heat exchanger 21 and then enters the user pipeline network.

[0040] Preferably, Figure 1 and Figure 3 As shown, in an embodiment, the circulating nitrogen compression part 3 can be a circulating nitrogen compressor. The circulating nitrogen compression part 3 can include a nitrogen inlet pipe 31 and a nitrogen outlet pipe 32. Among them, the nitrogen inlet pipe 31 is connected to the bottom of the purification distillation tower 20 through the heat exchanger 21, and is used to provide nitrogen to the distillation cold box 2. The nitrogen outlet pipe 32 is connected to the top of the purification distillation tower 20 through the heat exchanger 21, and is used to recover the nitrogen in the distillation cold box 2. The nitrogen enters the purification distillation tower 20 through the nitrogen inlet pipe 31 and is preliminarily cooled when passing through the heat exchanger 21. After the nitrogen enters the evaporator 202 and is further cooled, it enters the condenser 201 in the form of liquid nitrogen. The liquid nitrogen is gasified and then enters the circulating nitrogen compression part 3 through the nitrogen outlet pipe 32. During the process, the nitrogen absorbs heat when passing through the heat exchanger 21, thereby realizing the recovery of cold capacity.

[0041] Preferably, Figure 1 and Figure 3 As shown, in the embodiment, the circulating nitrogen compression unit 3 may further include a circulating hydraulic press 33 and a second cooler 34. The circulating hydraulic press 33 may be connected to the nitrogen outlet pipe 32, and the circulating hydraulic press 33 may also be connected to the second cooler 34. The second cooler 34 may be connected to the nitrogen inlet pipe 31. The nitrogen in the distillation cold box 2 is transported to the circulating hydraulic press 33 for compression through the nitrogen outlet pipe 32, and then cooled by the second cooler 34 and then transported to the bottom of the purification distillation tower 20 through the nitrogen inlet pipe 31 to realize nitrogen circulation.

[0042] Preferably, Figure 1 and Figure 3As shown, in an embodiment, the system for producing high-purity oxygen from general oxygen may also include a liquid nitrogen replenishing pipe 7 and a liquid nitrogen pipe 8. Among them, the liquid nitrogen replenishing pipe 7 can be directly connected to the top of the purification distillation tower 20, and is used to input liquid nitrogen into the purification distillation tower 20. On the one hand, it can make up for the cold loss in the distillation cold box 2, and on the other hand, it can make up for the loss of nitrogen. The liquid nitrogen pipe 8 can connect the top and bottom of the purification distillation tower 20, that is, as a passage for the circulation of liquid nitrogen between the condenser 201 and the evaporator 202, the liquid nitrogen pipe 8 can be installed with a throttle valve 80 for adjusting the pressure of liquid nitrogen. Preferably, the process cryogenic valves in the purification distillation tower 20 all use welded bellows sealing valves to ensure no external leakage, thereby fundamentally eliminating possible leakage points, so that the purification distillation tower 20 can operate stably for a long time.

[0043] During use, the general oxygen of the general oxygen source passes through the catalyst furnace 1 to remove combustible components such as hydrocarbons and hydrogen, and then enters the distillation cold box 2. The general oxygen is fractionated in the purification distillation tower 20 of the distillation cold box 2 to generate high-purity oxygen, and the exhaust gas is discharged from the top of the purification distillation tower 20. The heat load in the purification distillation tower 20 is provided by nitrogen, and the nitrogen is recycled through the circulating nitrogen compression part 3. The purification distillation tower 20 uses regular packing, which is safe and reliable in operation, has high distillation stability, and an operating flexibility range of 50% to 110%. The extraction rate of high-purity oxygen extracted by general oxygen is greater than or equal to 80%, so that high-purity oxygen can be produced from general oxygen.

[0044] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-described embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-described embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A system for producing high-purity oxygen from general oxygen, characterized in that: The system for producing high-purity oxygen from general oxygen comprises: General oxygen source; A catalyst furnace connected to the general oxygen source and used to remove combustible components in the general oxygen; a distillation cold box connected to the catalyst furnace, the distillation cold box comprising a purification distillation tower, a condenser is provided at the top of the purification distillation tower, an evaporator is provided at the bottom of the purification distillation tower, and during the production process, waste gas is discharged from the top of the purification distillation tower, and high-purity oxygen is discharged from the bottom of the purification distillation tower; and The circulating nitrogen compression part is connected to the distillation cold box and is used for providing and recovering nitrogen.

2. The system for producing high-purity oxygen from general oxygen according to claim 1, characterized in that: The catalyst furnace comprises: A regenerator connected to the general oxygen source; A heater connected to the regenerator; a catalytic reactor, one end of which is connected to the heater, and the other end of which is connected to the regenerator; and The first cooler, the regenerator is connected to the first cooler, and the first cooler is connected to the distillation cold box.

3. The system for producing high-purity oxygen from general oxygen according to claim 2, characterized in that: The catalyst furnace also includes: a first passage, communicating with the first cooler and the rectification cold box, wherein the first passage is provided with a first molecular sieve adsorber; and The second passage is arranged in parallel with the first passage, the second passage is provided with a second molecular sieve adsorber, and the second passage and the first passage are used alternately.

4. The system for producing high-purity oxygen from general oxygen according to claim 1, characterized in that: The distillation cold box further comprises a heat exchanger, and the catalyst furnace is provided with an oxygen inlet pipe, which is connected to the purification distillation tower through the heat exchanger.

5. The system for producing high-purity oxygen from general oxygen according to claim 4, characterized in that: The rectification cold box also includes: an exhaust gas pipe, the exhaust gas pipe being connected to the top of the purification distillation tower through the heat exchanger; a liquid high-purity oxygen pipe connected to the bottom of the purification distillation tower, through which the liquid high-purity oxygen is discharged; and A gaseous high-purity oxygen pipe is installed with a liquid oxygen pump. The gaseous high-purity oxygen pipe is connected to the bottom of the purification distillation tower through the heat exchanger, and the gaseous high-purity oxygen is discharged through the gaseous high-purity oxygen pipe.

6. The system for producing high-purity oxygen from general oxygen according to claim 4, characterized in that: The circulating nitrogen compression unit comprises: a nitrogen inlet pipe, the nitrogen inlet pipe being connected to the bottom of the purification distillation tower through the heat exchanger, and being used for providing nitrogen to the distillation cold box; and A nitrogen outlet pipe is connected to the top of the purification distillation tower through the heat exchanger and is used to recover the nitrogen in the distillation cold box.

7. The system for producing high-purity oxygen from general oxygen according to claim 6, characterized in that: The circulating nitrogen compression unit also includes: a circulating hydraulic press connected to the nitrogen outlet pipe; and A second cooler, the circulating hydraulic machine is connected to the second cooler, and the second cooler is connected to the nitrogen inlet pipe.

8. The system for producing high-purity oxygen from general oxygen according to any one of claims 1 to 7, characterized in that: The system for producing high-purity oxygen from general oxygen also includes: a liquid nitrogen replenishing pipe connected to the top of the purification distillation tower; and A liquid nitrogen pipe is connected to the top and bottom of the purification distillation tower, and a throttle valve is installed on the liquid nitrogen pipe.

9. The system for producing high-purity oxygen from general oxygen according to claim 1, characterized in that: The general oxygen source comprises a liquid oxygen tank, the liquid oxygen tank is connected to the catalyst furnace through a liquid oxygen pipeline, and the liquid oxygen pipeline is equipped with a liquid oxygen pump.

10. The system for producing high-purity oxygen from general oxygen according to claim 1 or 9, characterized in that: The general oxygen source includes an oxygen pipeline, and the oxygen pipeline is connected to the catalyst furnace.

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