An integrated multi-gas supply system

Abstract

The present invention discloses an integrated multi-gas supply system, which relates to the technical field of gas supply equipment and includes: an oxygen-enriched compression assembly including a first filter, an oxygen-enriched compressor, a first post-treatment unit, and an oxygen-enriched gas storage tank connected in sequence; an air separation assembly including a second filter, a first air compressor, a second post-treatment unit, a membrane separation assembly, and a nitrogen-enriched gas storage tank, and the oxygen-enriched gas flows back to the oxygen-enriched compression assembly; an air compression assembly including a third filter, a second air compressor, a third post-treatment unit, and a compressed air storage tank; an oxygen-enriched overflow valve, and the oxygen-enriched finished gas treated by the first post-treatment unit is transported to the oxygen-enriched gas storage tank or overflows to the compressed air storage tank through the oxygen-enriched overflow valve; a nitrogen-enriched overflow valve, and the nitrogen-enriched gas is transported to the nitrogen-enriched gas storage tank or overflows to the compressed air storage tank through the nitrogen-enriched overflow valve. This application can supply oxygen-enriched gas, nitrogen-enriched gas, and compressed air simultaneously, with low energy consumption and high operating efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of gas supply equipment, and particularly to an integrated multi-component gas supply system. Background Art

[0002] At present, for most process industries involving combustion processes, gas supply stations are often established using air separation technologies such as traditional cryogenic air separation, pressure swing adsorption (PSA), vacuum pressure swing adsorption (VPSA), and membrane methods to supply gases such as oxygen, nitrogen, and argon required by them. However, in existing gas supply stations, most are mainly supplied with oxygen and nitrogen, with large investment specifications, high operating unit consumption, and inability to provide large-scale compressed air for users simultaneously. In particular, gas supply stations based on the cryogenic method also have defects such as high operating costs, high maintenance costs, and high safety requirements.

[0003] Meanwhile, due to the narrow adjustment range, large investment intensity, and high operation and maintenance requirements of existing gas supply stations, they can often only be constructed in a centralized manner and require relatively complex pipe networks to be erected for long-distance transportation. However, in actual use, most end-users in process industries are often dispersed. For example, in the steel industry, the pre-ironmaking process and the post-steelmaking process belong to different sections. This dispersion makes it necessary to configure complex pipe networks in the gas supply and distribution of gas supply stations. On the one hand, the gas consumption demand of users is not necessarily constant, mostly showing periodic or quasi-periodic or even random change characteristics, and the required gas flow is not necessarily large; on the other hand, compressed air stations and traditional air separation stations are often constructed independently. It can be seen that large gas supply stations constructed in a traditional centralized manner will inevitably have high distribution energy consumption, a lot of leakage, and it is difficult to adapt to automatic adjustment under multiple working conditions.

[0004] In addition, the complex changes in actual user needs, the discrete characteristics of user distribution, and the increasing demand for oxygen-enriched gas applications have all put forward higher requirements for gas supply stations to adapt to the trend of carbon peak and carbon neutrality. For example, taking the pulverized coal injection process in the steel industry as an example, the pulverized coal injection process requires the gas supply station to provide nitrogen-rich gas to keep the pulverized coal in a boiling state of multiphase flow before pulverized coal injection to ensure the high efficiency and stability of pulverized coal injection. At the same time, the spray gun of the pulverized coal injection process requires compressed air to eject the pulverized coal. Since the pulverized coal injection process has requirements for the ejection characteristics of pulverized coal, the corresponding compressed air pressure is usually above 0.8 MPa, and even reaches 1.3 MPa according to different blast furnace characteristics and process requirements. That is to say, in the blast furnace ironmaking process, pulverized coal injection is a process that requires both other gases and compressed air. A steel enterprise usually has multiple blast furnaces, and these blast furnaces usually have a certain discrete distribution characteristic, with large and complex demands for oxygen-enriched gas, nitrogen-rich gas, and compressed air.

[0005] In the actual use process, in order to ensure the stable and smooth operation of the blast furnace, the corresponding compressed air compressor and the blast furnace usually adopt a one-to-one supply method. However, in this one-to-one method, for the selection of the air compressor corresponding to the compressed air, generally, the design selection surplus needs to be amplified twice to adapt to the development of subsequent new production capacity, and this double amplification results in most compressors on site operating inefficiently. If a centrifugal air compressor is used, the opening degree of its inlet guide vane is relatively small, and in severe cases, there will even be a blow-off phenomenon; if a screw air compressor is used, there is a relatively high unloading rate. Considering the changes in the blast furnace production process itself, this inefficient supply system itself also has fluctuations. At the same time, for nitrogen with a small demand, it needs to be remotely supplied through the corresponding pipe network and gas supply station. This is a double waste. On the one hand, the equipment corresponding to the compressed air operates inefficiently and the energy consumption remains high, while the corresponding nitrogen needs to be supplied by the gas supply station.

[0006] For another example, in the actual operation process of various cement, ceramic, and glass kilns, in order to ensure the high-efficiency energy conservation of the corresponding kiln combustion and reduce greenhouse gas emissions, oxygen-enriched operation is also required. This oxygen-enriched gas is based on a dual system of oxygen-enriched air and ordinary compressed air. The oxygen-enriched gas required by this kind of kiln requires a relatively low oxygen concentration. If traditional cryogenic methods or PSA (VPSA) methods are used to produce oxygen-enriched gas, there are problems such as large investment intensity, high operating energy consumption, difficulty in adapting to the periodic changes in the gas consumption of the kiln, and it is also particularly important for the reliable and stable operation of the gas station.

[0007] It can be seen from this that for gas-consuming end-users with characteristics of distributed discreteness, diverse gas demands, and fluctuating gas consumption, the existing gas supply stations have problems such as large transmission and distribution losses, high equipment energy consumption, low system energy efficiency, and high operating costs, and it is difficult to meet the diverse, high-energy-efficiency, and high-quality requirements of different process industries for gas. Summary of the Invention

[0008] 1. Technical problems to be solved by the invention

[0009] Aiming at the technical problems that the existing gas supply stations are not suitable for gas-consuming end-users with characteristics of distributed discreteness, diverse gas demands, and fluctuating gas consumption, and at the same time, there are problems such as large transmission and distribution losses, high equipment energy consumption, low system efficiency, and high operating costs, the present invention provides an integrated multi-gas supply system, which can simultaneously provide oxygen-enriched gas, nitrogen-enriched gas, and compressed air to users, is suitable for end-users with distributed discreteness, diverse gas demands, and fluctuating gas consumption, and has high system efficiency, low operating energy consumption, and low cost.

[0010] 2. Technical solutions

[0011] To solve the above problems, the technical solution provided by the present invention is as follows:

[0012] An integrated multi-gas supply system, comprising: an oxygen-enriched compression assembly, the oxygen-enriched compression assembly includes a first filter, an oxygen-enriched compressor, a first post-treatment unit and an oxygen-enriched gas storage tank connected in sequence;

[0013] An air separation assembly, the air separation assembly includes a second filter, a first air compressor, a second post-treatment unit, a membrane separation assembly and a nitrogen-enriched gas storage tank connected in sequence, the membrane separation assembly is used to separate oxygen-enriched gas and nitrogen-enriched gas from air, and the oxygen-enriched gas separated by the membrane separation assembly is refluxed to the oxygen-enriched compression assembly;

[0014] An air compression assembly, the air compression assembly includes a third filter, a second air compressor, a third post-treatment unit and a compressed air storage tank connected in sequence;

[0015] Wherein, the first post-treatment unit is connected to the compressed air storage tank, and an oxygen-enriched overflow valve is provided on the pipeline between the first post-treatment unit and the compressed air storage tank. The oxygen-enriched finished gas treated by the first post-treatment unit is transported to the oxygen-enriched gas storage tank or overflowed to the compressed air storage tank through the oxygen-enriched overflow valve; the membrane separation assembly is connected to the compressed air storage tank, and a nitrogen-enriched overflow valve is provided on the pipeline between the membrane separation assembly and the compressed air storage tank. The nitrogen-enriched gas separated by the membrane separation assembly is transported to the nitrogen-enriched gas storage tank or overflowed to the compressed air storage tank through the nitrogen-enriched overflow valve.

[0016] In this application, the oxygen-enriched compression assembly serves as an oxygen-enriched supply branch to supply oxygen-enriched gas to end users; the air separation assembly separates oxygen-enriched gas and nitrogen-enriched gas through the membrane separation assembly, provides oxygen-enriched gas to the oxygen-enriched compression assembly, and at the same time, serves as a nitrogen-enriched supply branch to supply nitrogen-enriched gas to end users; the air compression assembly serves as a compressed air supply branch to supply compressed air to end users.

[0017] During operation, air passes through the first filter, the second filter, and the third filter respectively, and flows into the oxygen-enriched compressor, the first air compressor, and the second air compressor correspondingly. For the first air compressor, the compressed air after being processed by the first air compressor enters the second post-treatment unit for dehumidification, dust removal, and oil removal, and then enters the membrane separation module. The air is separated into oxygen-enriched gas and nitrogen-enriched gas according to different permeation rates. Among them, the oxygen-enriched gas flows back to the oxygen-enriched compression module through the control valve, and after being processed, enters the oxygen-enriched gas storage tank. After stabilizing the system pressure, oxygen-enriched gas with the required concentration is provided to the end user. Or, according to the gas consumption change and operating conditions of the end user, through the oxygen-enriched overflow valve, the excess oxygen-enriched gas or all the oxygen-enriched gas after meeting the required amount of oxygen-enriched gas for the end user is overflowed into the compression pipeline corresponding to the compressed air storage tank. This setting can not only improve the operating efficiency of the entire gas supply system, but also directly serve as a backup system for obtaining compressed air to supply compressed air to the end user demanding compressed air. In addition, the nitrogen-enriched gas enters the nitrogen-enriched gas storage tank through the pipeline. After stabilizing the system pressure, nitrogen-enriched gas with the required concentration is provided to the end user. Or, according to the gas consumption change and operating conditions of the end user, through the nitrogen-enriched overflow valve, after meeting the required amount of nitrogen-enriched gas for the end user, the excess nitrogen-enriched gas or all the nitrogen-enriched gas is overflowed into the compression pipeline corresponding to the compressed air storage tank to form the mixed compressed air. This setting can not only reduce the energy consumption of the entire compression pipeline in the compressed air module, optimize the operating energy consumption of the entire gas supply system, but also serve as a backup system for obtaining compressed air and improve the regulation ability of nitrogen. For the second air compressor, the compressed air after compression enters the corresponding third post-treatment unit for dehumidification, dust removal, and oil removal in sequence, and then enters the corresponding compressed air storage tank. After stabilizing the system pressure, the required compressed air is provided to the end user.

[0018] It can be seen from this that the integrated multi-gas supply system in this application can supply oxygen-enriched gas, nitrogen-enriched gas, and compressed air to the end user at the same time in terms of gas supply types, and provide any one or two of the oxygen-enriched gas, nitrogen-enriched gas, and compressed air according to the needs of the end user, realizing the integration and diversification of the supply system, and adapting to end users with distributed applications, diverse gas demands, and fluctuating gas consumption. In terms of layout, it can be either centralized or distributed. In terms of operation, through the overflow mode of oxygen-enriched gas and nitrogen-enriched gas, it can serve as a backup system for compressed air, ensuring the safe operation of the entire system, significantly reducing the operating energy consumption and operating cost of the entire gas supply system, and improving the system efficiency.

[0019] Optionally, a branch pipeline is provided on the membrane separation module, and an oxygen-enriched outlet valve is provided on the branch pipeline.

[0020] Optionally, there are multiple groups of the air compression assemblies, and the multiple groups of air compression assemblies are connected in parallel.

[0021] Optionally, a master control fluid control valve is provided on the pipeline between the second air compressor and the third post-treatment unit, and the master control fluid control valve is close to the third post-treatment unit.

[0022] Optionally, a first gas pressure sensor and a first gas flow sensor are provided at the air inlet of the third post-treatment unit, and a second gas pressure sensor and a second gas flow sensor are provided at the air outlet of the third post-treatment unit.

[0023] Optionally, when the oxygen-enriched compressor, the first air compressor or the second air compressor is a centrifugal air compressor or an oil-free screw compressor, the corresponding first post-treatment unit, second post-treatment unit or third post-treatment unit is an integrated multi-mode intelligent and efficient dryer; or, when the oxygen-enriched compressor, the first air compressor or the second air compressor is an oil-injected screw compressor or a water-injected screw compressor, the corresponding first post-treatment unit, second post-treatment unit or third post-treatment unit is a blast zero-air-consumption dryer, and a fourth filter is provided on the blast zero-air-consumption dryer.

[0024] Optionally, the membrane separation assembly has an air inlet, a nitrogen-rich air outlet and an oxygen-enriched air outlet. A compressed air pressure sensor and a compressed air flow sensor are provided at the air inlet. A nitrogen-rich pressure sensor, a nitrogen-rich flow sensor and a nitrogen-rich concentration sensor are provided at the nitrogen-rich air outlet. An oxygen-enriched pressure sensor, a first oxygen-enriched flow sensor and a first oxygen-enriched concentration sensor are provided at the oxygen-enriched air outlet.

[0025] Optionally, the temperature of the compressed air at the air inlet of the membrane separation assembly is 40-60 °C.

[0026] Optionally, the membrane separation assembly is connected to the pipeline between the first filter and the oxygen-enriched compressor. An air flow sensor and an oxygen concentration sensor are provided at the air outlet of the first filter. A second oxygen-enriched flow sensor and a second oxygen-enriched concentration sensor are provided on the pipeline connecting the membrane separation assembly to the pipeline between the first filter and the oxygen-enriched compressor. A mixed gas flow sensor and a total oxygen concentration sensor are provided at the air outlet of the oxygen-enriched compressor.

[0027] Optionally, the exhaust pressure of the first air compressor is greater than the exhaust pressure of the second air compressor.

[0028] 3. Beneficial effects

[0029] Adopting the technical solution provided by the present invention, compared with the prior art, it has the following beneficial effects:

[0030] (1) An integrated multi-gas supply system proposed in an embodiment of the present application can supply oxygen-rich gas, nitrogen-rich gas, and compressed air to end-users simultaneously in terms of gas supply types. Additionally, according to the needs of end-users, it can provide any one or a mixture of two of oxygen-rich gas, nitrogen-rich gas, and compressed air, realizing the integration and diversification of the supply system and adapting to end-users with distributed applications, diverse gas demands, and fluctuating gas consumption. In terms of layout, it can be either centralized or distributed. In terms of operation, through the overflow mode of oxygen-rich gas and nitrogen-rich gas, it can serve as a backup system for compressed air, ensuring the safe operation of the entire system, significantly reducing the operation energy consumption and operation cost of the entire gas supply system, and improving system efficiency.

[0031] (2) An integrated multi-gas supply system proposed in an embodiment of the present application is provided with branch pipelines, enabling the oxygen-rich gas separated by the membrane separation module to be directly transported through the branch pipelines to end-users for use. The oxygen-rich outlet valve is used to control the connection and disconnection between the branch pipelines and end-users. At the same time, it can be adaptively adjusted according to the concentration and flow rate of oxygen-rich gas required by end-users, or it can also flow back to the inlet of the oxygen-rich compressor through the control valve and be mixed with the air treated by the first filter, then enter the oxygen-rich compressor for compression treatment and be connected to the corresponding oxygen-rich gas pipeline. Thus, it can be seen that the oxygen-rich gas in the present application can be directly diversely applied.

[0032] (3) An integrated multi-gas supply system proposed in an embodiment of the present application is provided with a main pipeline fluid control valve, enabling the entire air compression module pipeline to adopt an optimized operation concept based on the main pipeline. Under the action of the control valve, the corresponding third post-treatment unit ensures the balanced gas flow rate of the gas flowing through the third post-treatment unit, and at the same time, according to the actual operation process, ensures that the resistance of the compressed air post-treatment pipeline can be optimized and controlled based on the number of units. The optimized control of the post-treatment system resistance based on the main pipeline adopted in the present application is a control target that cannot be achieved by traditional technologies.

[0033] (4) An integrated multi-gas supply system proposed in an embodiment of the present application is provided with the second gas pressure sensor and the second gas flow sensor to detect the pressure and flow rate of the gas at the outlet of the third post-treatment unit. At the same time, in combination with the control valve on its corresponding pipeline, by controlling this valve, the dynamic balance of the gas flow rate in the third post-treatment unit is ensured, thereby ensuring the efficient operation of the third post-treatment unit.

[0034] (5) An integrated multi - gas supply system proposed in the embodiments of the present application, by adopting different types of compressors and equipping corresponding processing units, can ensure that the compressed air entering the membrane separation module is oil - free and water - free. After passing through the membrane separation module, the finished gas can directly be oil - free and water - free without the need for secondary quality treatment.

[0035] (6) An integrated multi - gas supply system proposed in the embodiments of the present application, by setting the air flow sensor to detect the air flow Q1 discharged from the outlet of the first filter, the oxygen concentration sensor to detect the oxygen concentration ε1 in the air discharged from the first filter; the second oxygen - enriched flow sensor to detect the oxygen - enriched flow Q2 of the oxygen - enriched gas separated by the membrane separation module flowing back to the pipeline between the first filter and the oxygen - enriched compressor, and the second oxygen - enriched concentration sensor to detect the oxygen - enriched concentration ε2 of the oxygen - enriched gas separated by the membrane separation module flowing back to the pipeline between the first filter and the oxygen - enriched compressor; the mixed - gas flow sensor to detect the total mixed flow Q3 of the oxygen - enriched gas and air discharged from the outlet of the oxygen - enriched compressor, and the total oxygen concentration sensor to detect the total oxygen concentration ε3 of the oxygen discharged from the outlet of the oxygen - enriched compressor. Based on the detection of the above various control parameters, an oxygen - enriched gas - to - air mixing ratio model is established. Through this model, under the condition of the oxygen concentration ε1 in the given air, for the demand of the target oxygen concentration, that is, ε3, of the end - user, with the change of the oxygen - enriched concentration ε2 of the oxygen - enriched gas separated by the membrane separation module flowing back to the pipeline between the first filter and the oxygen - enriched compressor, the corresponding oxygen - enriched gas - to - air mixing ratio can achieve digital visual real - time monitoring of the oxygen - enriched gas - to - air mixing ratio. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic flow - structure diagram of an integrated multi - gas supply system proposed in the embodiments of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] To further understand the content of the present invention, the present invention will be described in detail in combination with the drawings and embodiments.

[0038] The present application will be further described in detail below in conjunction with the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only for explaining the relevant invention, rather than limiting the invention. Additionally, it should be noted that for the sake of convenience in description, only the parts related to the invention are shown in the drawings. The terms such as "first", "second", etc. in the present invention are set for the convenience of describing the technical solution of the present invention and have no specific limiting effect. They are all general references and do not constitute a limiting effect on the technical solution of the present invention. It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is 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 thus should not be construed as a limitation to the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. Unless otherwise clearly specified and limited, the terms "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] Embodiment 1

[0040] Combined with the attached Figure 1, this embodiment provides an integrated multi-gas supply system, including: an oxygen-enriched compression assembly, the oxygen-enriched compression assembly includes a first filter 1, an oxygen-enriched compressor 2, a first post-treatment unit 3, and an oxygen-enriched gas storage tank 4 connected in sequence; an air separation assembly, the air separation assembly includes a second filter 5, a first air compressor 6, a second post-treatment unit 7, a membrane separation assembly 8, and a nitrogen-enriched gas storage tank 9 connected in sequence, the membrane separation assembly 8 is used to separate oxygen-enriched gas and nitrogen-enriched gas from air, and the oxygen-enriched gas separated by the membrane separation assembly 8 flows back to the oxygen-enriched compression assembly; an air compression assembly, the air compression assembly includes a third filter 10, a second air compressor 11, a third post-treatment unit 12, and a compressed air storage tank 13; wherein, the first post-treatment unit 3 is connected to the compressed air storage tank 13, and an oxygen-enriched overflow valve 14 is provided on the pipeline between the first post-treatment unit 3 and the compressed air storage tank 13, and the oxygen-enriched finished gas treated by the first post-treatment unit 3 is transported to the oxygen-enriched gas storage tank 4 or overflows to the compressed air storage tank 13 through the oxygen-enriched overflow valve 14; the membrane separation assembly 8 is connected to the compressed air storage tank 13, and a nitrogen-enriched overflow valve 15 is provided on the pipeline between the membrane separation assembly 8 and the compressed air storage tank 13, and the nitrogen-enriched gas separated by the membrane separation assembly 8 is transported to the nitrogen-enriched gas storage tank 9 or overflows to the compressed air storage tank 13 through the nitrogen-enriched overflow valve 15.

[0041] In this application, the oxygen-enriched compression assembly serves as an oxygen-enriched supply branch to supply oxygen-enriched gas to end-users; the air separation assembly separates oxygen-enriched gas and nitrogen-enriched gas through a membrane separation assembly, provides oxygen-enriched gas to the oxygen-enriched compression assembly, and at the same time serves as a nitrogen-enriched supply branch to supply nitrogen-enriched gas to end-users; the air compression assembly serves as a compressed air supply branch to supply compressed air to end-users. During operation, air passes through the first filter 1, the second filter 5, and the third filter 10 respectively and flows into the oxygen-enriched compressor 2, the first air compressor 6, and the second air compressor 11 correspondingly. For the first air compressor 6, the compressed air processed by the first air compressor 6 enters the second post-treatment unit 7 for dehumidification, dust removal, and oil removal, and then enters the membrane separation assembly 8. The air separates into oxygen-enriched gas and nitrogen-enriched gas according to different permeation rates; among them, the oxygen-enriched gas returns to the oxygen-enriched compression assembly, mixes with the air processed by the first filter 1, is compressed by the oxygen-enriched compressor 2, and then enters the first post-treatment unit 3 for dehumidification, dust removal, and oil removal, and then enters the oxygen-enriched gas storage tank 4. After stabilizing the system pressure, it provides oxygen-enriched gas with the required concentration to end-users; alternatively, according to the gas consumption change and working conditions of end-users, through the oxygen-enriched overflow valve 14, the excess oxygen-enriched gas or all of the oxygen-enriched gas after meeting the required amount of oxygen-enriched gas for end-users is overflowed into the compressed air storage tank 13. This setting can not only improve the operating efficiency of the entire gas supply system but also directly serve as a backup system for obtaining compressed air to supply compressed air to end-users who need compressed air; in addition, the nitrogen-enriched gas enters the nitrogen-enriched gas storage tank 9 through a pipeline. After stabilizing the system pressure, it provides nitrogen-enriched gas with the required concentration to end-users; alternatively, according to the gas consumption change and working conditions of end-users, through the nitrogen-enriched overflow valve 15, after meeting the required amount of nitrogen-enriched gas for end-users, the excess nitrogen-enriched gas or all of the nitrogen-enriched gas is overflowed into the compressed air storage tank 13 to form mixed compressed air. This setting can not only reduce the energy consumption of the entire compression pipeline in the compressed air assembly, optimize the operating energy consumption of the entire gas supply system, but also serve as a backup system for obtaining compressed air and improve the regulation ability of nitrogen. For the second air compressor 11, the compressed air after compression enters the corresponding third post-treatment unit 12 for dehumidification, dust removal, and oil removal in sequence, and then enters the corresponding compressed air storage tank 13. After stabilizing the system pressure, it provides the required compressed air to end-users.It can be seen from this that the integrated multi-gas supply system in the present application can supply oxygen-rich gas, nitrogen-rich gas, and compressed air to end-users simultaneously in terms of gas supply types, and can also provide a mixture of any one or two of oxygen-rich gas, nitrogen-rich gas, and compressed air according to the needs of end-users, realizing the integration and diversification of the supply system and adapting to end-users with distributed applications, diverse gas demands, and fluctuating gas consumption; in terms of layout, it can be either centralized or distributed; in terms of operation, through the overflow mode of oxygen-rich gas and nitrogen-rich gas, it can be used as a backup system for compressed air, ensuring the safe operation of the entire system, significantly reducing the operation energy consumption and operation cost of the entire gas supply system, and improving the system efficiency.

[0042] In actual operation, the first filter 1, the oxygen-rich compressor 2, the first post-treatment unit 3, and the oxygen-rich gas storage tank 4, the second filter 5, the first air compressor 6, the second post-treatment unit 7, the membrane separation module 8, and the nitrogen-rich gas storage tank 9, the third filter 10, the second air compressor 11, the third post-treatment unit 12, and the compressed air storage tank 13 are all connected by pipelines; control valves 16 are correspondingly provided on the pipelines, and the control valves 16 are used to control the opening, cutting-off, and opening / closing degree of the pipelines between each component, and further control the flow rate, pressure, and concentration of the gas.

[0043] In actual operation, the membrane separation module 8 is connected to the pipeline between the first filter 1 and the oxygen-rich compressor 2 through a pipeline, so that the oxygen-rich gas separated by the membrane separation module 8 flows back to the oxygen-rich compression module and is mixed with the air treated by the first filter 1, and then enters the oxygen-rich compressor 2 for compression; the pipeline between the first post-treatment unit 3 and the oxygen-rich gas storage tank 4 is connected to the pipeline between the third post-treatment unit 12 and the compressed air storage tank 13 through an oxygen-rich overflow valve 14, so that the oxygen-rich finished gas treated by the first post-treatment unit 3 overflows to the compressed air storage tank 13; the pipeline between the membrane separation module 8 and the nitrogen-rich gas storage tank 9 is connected to the pipeline between the third post-treatment unit 12 and the compressed air storage tank 13 through a nitrogen-rich overflow valve 15, so that the nitrogen-rich gas separated by the membrane separation module 8 overflows to the compressed air storage tank 13.

[0044] In actual operation, gas outlet valves 20 are provided at the outlets of the oxygen-rich gas storage tank 4, the nitrogen-rich gas storage tank 9, and the compressed air storage tank 13, and the gas outlet valves 20 are used to control the corresponding oxygen-rich gas storage tank 4, nitrogen-rich gas storage tank 9, and compressed air storage tank 13 to provide gas with the required concentration to end-users.

[0045] In actual operation, a control system is further included, which is used to control the working states of each component in the entire gas supply system.

[0046] In this application, the membrane separation module belongs to the prior art.

[0047] In actual operation, during the use of the integrated multi-gas supply system of this application, the overflow modes involved can be generally divided into the following three types:

[0048] (1) Nitrogen-rich / oxygen-rich gas adaptive overflow mode; that is, under the corresponding concentration conditions of oxygen-rich gas and nitrogen-rich gas, according to the user's requirements for gas, it is adaptively supplied, including concentration, flow rate, and pressure. At the same time, the excess oxygen-rich / nitrogen-rich gas overflows into the pipeline of the compressed air module through the corresponding nitrogen-rich overflow valve 15 or oxygen-rich overflow valve 14, generally the compressed air storage tank 13.

[0049] For example, for nitrogen-rich gas, generally due to considering the local resistance of the membrane separation module 8, the exhaust pressure of the corresponding nitrogen-rich gas is usually higher than the pressure of the compressed air branch. On the premise of meeting the nitrogen demand of the end user, the first air compressor 6 with a higher selected pressure is started according to the designed operating condition point, so as to ensure the lowest energy consumption per unit mass of nitrogen during the nitrogen production process. At this time, the part of nitrogen that the end user cannot consume can overflow into the corresponding compressed air pipeline in the air compression module through the nitrogen-rich overflow valve, that is, the corresponding compressed air storage tank 13. This mode ensures the efficient operation of high-pressure equipment in the system on the one hand, and directly optimizes the energy consumption of the compressed air system based on the overflow system on the other hand.

[0050] (2) Full nitrogen overflow mode; in the actual process, not all end users need nitrogen. However, if the membrane separation module 8 is put into operation, nitrogen-rich gas with a certain pressure will inevitably be generated. If this part of air is discharged, it will obviously cause double waste of system energy consumption and cost. Therefore, for sites that require oxygen-rich gas but do not need nitrogen, the full nitrogen overflow mode is adopted, and the nitrogen-rich gas generated by the membrane separation module directly overflows into the compressed air pipeline in the corresponding air compression module, that is, the corresponding compressed air storage tank 13.

[0051] (3) Nitrogen-rich overflow valve 15 and oxygen-rich overflow valve 14 closed mode; for the gas supply system, it is first necessary to meet the requirements of different end users for oxygen-rich and nitrogen-rich gases. If the end user continuously requires the gas supply system to supply gas at full load, the nitrogen-rich overflow valve 15 and oxygen-rich overflow valve 14 are closed. At this time, oxygen-rich and nitrogen-rich fully meet the user's needs, and this mode is the basic selection mode of the overflow mode.

[0052] Embodiment 2

[0053] Combined with the attached Figure 1, An integrated multi-gas supply system according to this embodiment. Compared with the technical solution of Embodiment 1, a branch pipe 17 is provided on the membrane separation module 8, and an oxygen-rich outlet valve 19 is provided on the branch pipe 17. The oxygen-rich gas separated by the membrane separation module 8 can be directly transported to the end user through the branch pipe 17 for use. The oxygen-rich outlet valve 19 is used to control the connection and disconnection between the branch pipe 17 and the end user. At the same time, it can be adaptively adjusted according to the concentration and flow rate of the oxygen-rich gas required by the end user. It can also flow back to the inlet of the oxygen-rich compressor 2 through the control valve 16, mix with the air treated by the first filter, enter the oxygen-rich compressor 2 for compression treatment, and be connected to the corresponding oxygen-rich gas pipeline. It can be seen from this that the oxygen-rich gas of this application can be directly and diversely applied.

[0054] Embodiment 3

[0055] An integrated multi-gas supply system according to this embodiment. Compared with the technical solution of Embodiment 1, there are multiple groups of the air compression modules, and multiple groups of the air compression modules are connected in parallel. In actual operation, as Figure 1 shown, there are two groups of the air compression modules. One group is for use, and the other group is for standby. Once the air compression module for use fails, the standby one can be started to ensure the normal operation of the air supply pipeline of the entire compressed air module.

[0056] Embodiment 4

[0057] Combined with the attached Figure 1 , An integrated multi-gas supply system according to this embodiment. Compared with the technical solution of Embodiment 3, a main control fluid control valve 18 is provided on the pipeline between the second air compressor 11 and the third post-treatment unit 12, and the main control fluid control valve 18 is close to the third post-treatment unit 12. By setting the main control fluid control valve 18, the entire air compression module pipeline adopts an optimized operation concept based on the main control system. Under the action of the control valve 16, the corresponding third post-treatment unit 12 ensures the balanced gas flow rate flowing through the third post-treatment unit 12, and according to the actual operation process, ensures that the resistance of the compressed air post-treatment pipeline can be optimized and controlled based on the number of units. The application adopts an optimized control of the resistance of the post-treatment system based on the main control system, which is a control target that cannot be achieved by traditional technologies.

[0058] Embodiment 5

[0059] An integrated multi-gas supply system according to this embodiment. Compared with the technical solution of Embodiment 4, a first gas pressure sensor and a first gas flow sensor (not shown in the figure) are provided at the air inlet of the third post-treatment unit 12, and a second gas pressure sensor and a second gas flow sensor (not shown in the figure) are provided at the air outlet of the third post-treatment unit 12.

[0060] For the pipeline of the air compression component, when operating with a main pipeline system, although decoupling of the second air compressor 11 and the third post-treatment unit 12 can be achieved, that is, if the second air compressor 11 needs to be repaired, the third post-treatment unit 12 will not be affected. However, during actual operation, dynamic balance control of the gas flow rate processed in the third post-treatment unit 12 needs to be achieved. Based on real-time monitoring of the gas flow rate during the operation of the third post-treatment unit 12, in this application, the second gas pressure sensor and the second gas flow sensor are provided to detect the pressure and flow rate of the gas at the outlet of the third post-treatment unit 12. At the same time, in combination with the control valve 16 on its corresponding pipeline, by controlling this valve, the dynamic balance of the gas flow rate processed in the third post-treatment unit 12 is ensured, thereby ensuring the efficient operation of the third post-treatment unit 12.

[0061] At the same time, in actual application, considering the resistance loss during the entire operation of the third post-treatment unit 12, in this application, the first gas pressure sensor and the second gas pressure sensor are used to monitor in real time the pressure P1 of the gas at the inlet of the third post-treatment unit 12 and the gas pressure P2 at the outlet. The overall resistance loss corresponding to the third post-treatment unit 12 is ΔP = P1 - P2; the corresponding pipeline design resistance ΔP0 = P 10 -P 20 , where P 10 is the inlet pressure of the pipeline design, and P 20 is the outlet pressure of the pipeline design; the resistance ratio model parameter is obtained: η = ΔP / ΔP0.

[0062] During actual use, if η ≧ 1, within the characteristics range of the third post-treatment unit 12 (usually referring to a dryer), based on the operation of the main pipeline system, an additional standby dryer is enabled to optimize the resistance loss of the pipeline of the third post-treatment unit 12.

[0063] Example 6

[0064] For an integrated multi-gas supply system according to this example, compared with the technical solution of Example 1, when the oxygen-enriched compressor 2, the first air compressor 6, or the second air compressor 11 is a centrifugal air compressor or an oil-free screw compressor, the corresponding first post-treatment unit 3, the second post-treatment unit 7, or the third post-treatment unit 12 is an integrated multi-mode intelligent and efficient dryer; or, when the oxygen-enriched compressor 2, the first air compressor 6, or the second air compressor 11 is an oil-injected screw compressor or a water-injected screw compressor, the corresponding first post-treatment unit 3, the second post-treatment unit 7, or the third post-treatment unit 12 is a blast zero-air-consumption dryer, and a fourth filter is provided on the blast zero-air-consumption dryer.

[0065] In actual operation, the oxygen-enriched compressor 2, the first air compressor 6 or the second air compressor 11 is any one of an oil-injected screw compressor, a centrifugal air compressor, a water-injected screw compressor, and an oil-free screw compressor. In this application, when the oxygen-enriched compressor 2, the first air compressor 6 or the second air compressor 11 is a centrifugal air compressor or an oil-free screw compressor, an integrated multi-mode intelligent high-efficiency dryer is used for treatment. Compared with the traditional drying device, this dryer has low energy consumption, can make full use of the compressed waste heat and the environmental cooling capacity, and can achieve multi-level dew point control (from atmospheric dew point -20°C to pressure dew point -40°C).

[0066] At the same time, as Figure 1 shown, when the oxygen-enriched compressor 2, the first air compressor 6 or the second air compressor 11 is an oil-injected screw compressor or a water-injected screw compressor, a blowing zero-air-consumption dryer is used. A fourth filter is provided on the blowing zero-air-consumption dryer. The post-treatment unit in this way can avoid the problem of regeneration air consumption in traditional micro-heat or heatless drying.

[0067] In this application, by using different types of compressors and equipped with corresponding treatment units, it can be ensured that the compressed air entering the membrane separation module 8 can be oil-free and water-free, and after passing through the membrane separation module 8, the finished gas can directly be oil-free and water-free without the need for secondary quality treatment.

[0068] It should be noted that the structure and the specific working principle of the integrated multi-mode intelligent high-efficiency dryer in this application belong to the prior art. For details, please refer to the description in CN201910399803.1, a low-energy consumption general multi-mode intelligent adsorption drying method for compressed air preparation. Here, this application will not elaborate further; at the same time, the blowing zero-air-consumption dryer also belongs to the prior art and will not be elaborated further here.

[0069] Example 7

[0070] For an integrated multi-component gas supply system in this embodiment, compared with the technical solution of Embodiment 1, the membrane separation module 8 has an air inlet, a nitrogen-rich air outlet, and an oxygen-rich air outlet (not marked in the figure). A compressed air pressure sensor and a compressed air flow sensor (not shown in the figure) are provided at the air inlet. A nitrogen-rich pressure sensor, a nitrogen-rich flow sensor, and a nitrogen-rich concentration sensor (not shown in the figure) are provided at the nitrogen-rich air outlet. An oxygen-rich pressure sensor, a first oxygen-rich flow sensor, and a first oxygen-rich concentration sensor (not shown in the figure) are provided at the oxygen-rich air outlet.

[0071] In practical applications, the second post-treatment unit 7 is connected to the air inlet, the nitrogen-rich gas outlet is connected to the nitrogen-rich gas storage tank 9, and the oxygen-rich gas outlet is connected to the oxygen-rich gas compressor 2. By setting a compressed air pressure sensor and a compressed air flow sensor to monitor the pressure and flow rate of the compressed air entering the membrane separation module 8; at the same time, by setting a nitrogen-rich pressure sensor, a nitrogen-rich flow sensor, and a nitrogen-rich concentration sensor to monitor the pressure, flow rate, and concentration of nitrogen at the nitrogen-rich gas outlet; and by setting an oxygen-rich pressure sensor, a first oxygen-rich flow sensor, and a first oxygen-rich concentration sensor to monitor the pressure, flow rate, and concentration of oxygen at the oxygen-rich gas outlet, the operation of the membrane separation module 8 under different working conditions can be monitored in this way.

[0072] On this basis, according to the changing characteristics of user requirements and the fluctuations of the process and environmental conditions, during actual gas supply, each gas path can achieve adaptive control. By controlling target parameters, such as the concentration, pressure, and flow rate of the oxygen-rich gas and the concentration, pressure, and flow rate of the nitrogen-rich gas, the pressure of the corresponding compressor and the pressure difference of the membrane separation module 8 in the gas compression pipeline can be controlled in real time, ensuring that the concentration and flow rate of the corresponding oxygen-rich and nitrogen-rich gas paths are adjusted within the corresponding ranges.

[0073] Example 8

[0074] For an integrated multi-gas supply system in this embodiment, compared with the technical solution of Example 7, the temperature of the compressed air at the air inlet of the membrane separation module 8 is 40 - 60 °C.

[0075] In practical applications, the regulation of the temperature of the compressed air at the air inlet of the membrane separation module 8 is achieved by setting the control valve 16 on the pipeline between the second post-treatment unit 7 and the membrane separation module 8 as a valve based on pump-valve integration control technology. For details, please refer to the valve control method and valve for integrated dynamic flow balance and energy control disclosed in CN202010219988.6. That is, by controlling the cooling water system, the temperature of the compressed air at the air inlet of the membrane separation module 8 is accurately controlled within the range of 40 - 60 °C. During actual use, if the temperature of the compressed air at the air inlet of the membrane separation module 8 is lower than 40 °C, it is difficult to optimize the flow rate of the compressed air entering the membrane separation module 8. If the temperature of the compressed air at the air inlet of the membrane separation module 8 is higher than 60 °C, it is not conducive to the stability of the membrane material in the membrane separation module 8. The setting of this temperature range provides a good temperature environment for the subsequent operation of the membrane separation module 8, thereby improving the separation efficiency of the membrane separation module 8.

[0076] Example 9

[0077] An integrated multi-gas supply system according to this embodiment, compared with the technical solution of Embodiment 1, the membrane separation module 8 is connected to the pipeline between the first filter 1 and the oxygen-enriched compressor 2. An air flow sensor and an oxygen concentration sensor are provided at the air outlet of the first filter 1. A second oxygen-enriched flow sensor and a second oxygen-enriched concentration sensor (not shown in the figure) are provided on the pipeline connecting the membrane separation module 8 to the pipeline between the first filter 1 and the oxygen-enriched compressor 2. A mixed gas flow sensor and a total oxygen concentration sensor (not shown in the figure) are provided at the air outlet of the oxygen-enriched compressor 2.

[0078] Generally, the oxygen concentration requirements of end-user processes have a certain degree of volatility. The control of this volatility places requirements on the concentration of oxygen-enriched gas and the mixing ratio of oxygen-enriched gas to air. In this application, the air flow sensor is provided to detect the air flow rate Q1, kg / min, discharged from the air outlet of the first filter 1, and the oxygen concentration sensor is provided to detect the oxygen concentration ε1, %, contained in the air discharged from the first filter 1. The second oxygen-enriched flow sensor is provided to detect the oxygen-enriched flow rate Q2, kg / min, of the oxygen-enriched gas separated by the membrane separation module 8 and returned to the pipeline between the first filter 1 and the oxygen-enriched compressor 2, and the second oxygen-enriched concentration sensor is provided to detect the oxygen-enriched concentration ε2, %, of the oxygen-enriched gas separated by the membrane separation module 8 and returned to the pipeline between the first filter 1 and the oxygen-enriched compressor 2. The mixed gas flow sensor is used to detect the total mixed flow rate Q3, kg / min, of oxygen-enriched and air discharged from the air outlet of the oxygen-enriched compressor 2, and the total oxygen concentration sensor is provided to detect the total oxygen concentration ε3, %, of the oxygen discharged from the air outlet of the oxygen-enriched compressor 2. Based on the detection of the above various control parameters, this application establishes an oxygen-enriched gas and air mixing ratio model, specifically as follows:

[0079] First, according to the law of conservation of oxygen mass, the basic relationship between the air flow rate Q1 discharged from the air outlet of the first filter 1 and the oxygen concentration ε1 contained in the air:

[0080] Q3 = Q1 + Q2 (1)

[0081] Q3 * ε3 = Q1 * ε1 + Q2 * ε2 (2)

[0082] Generally, in actual working conditions, the oxygen-rich gas separated by the membrane separation module 8 returns to the oxygen-rich flow rate Q2 in the pipeline between the first filter 1 and the oxygen-rich compressor 2. The oxygen-rich concentration ε2 of the oxygen-rich gas separated by the membrane separation module 8 that returns to the pipeline between the first filter 1 and the oxygen-rich compressor 2, the total mixed flow rate Q3 of oxygen-rich and air, the concentration ε1 of oxygen contained in the air, and the total concentration ε3 of oxygen discharged at the outlet of the oxygen-rich compressor 2, % are easily detectable. However, for the target demand of the end user for the oxygen concentration, that is, the total concentration ε3 of oxygen discharged at the outlet of the oxygen-rich compressor 2, visual control of the mixing ratio of the oxygen-rich gas and air needs to be achieved.

[0083] By substituting the above formula (1) into formula (2), we obtain: (Q1 + Q2)*ε3 = Q1*ε1 + Q2*ε2 (3);

[0084] Then, after adjustment, we obtain Q2*(ε3 - ε2) = Q1*(ε1 - ε3) (4);

[0085] Finally, the mixing ratio of the oxygen-rich gas and air is obtained as: Δ = Q2 / Q1 = (ε1 - ε3) / (ε3 - ε2).

[0086] In this application, through the above-built mixing ratio model of the oxygen-rich gas and air, under the condition of the concentration ε1 of oxygen contained in the established air, facing the demand of the end user for the target oxygen concentration, that is, ε3, with the difference of the oxygen-rich concentration ε2 to be pressurized, the corresponding mixing ratio of the oxygen-rich gas and air can achieve digital visual real-time monitoring of the mixing ratio of oxygen-rich and air.

[0087] In actual operation, for the oxygen-rich compressor 2, the oxygen-rich concentration to be pressurized in the mixed gas at the inlet can be adjusted, and at the same time, according to the requirements of the end user for the oxygen-rich concentration, the mixing ratio and the corresponding flow rate of the oxygen-rich and air can be controlled. In actual operation, the adjustment of the oxygen-rich flow rate to match the corresponding compressor form can adopt industrial frequency loading and unloading, variable frequency control, or the control of the opening of the inlet guide vane; at the same time, a corresponding control valve 16 is used at the outlet of the post-treatment unit to control the outlet pressure of the corresponding gas storage tank.

[0088] Embodiment 10

[0089] For an integrated multi-gas supply system in this embodiment, compared with the technical solution of Embodiment 1, the exhaust pressure of the first air compressor 6 is greater than the exhaust pressure of the second air compressor 11.

[0090] From the perspective of optimizing gas supply, due to the resistance loss of the membrane separation module 8 itself, in this application, the exhaust pressure of the first air compressor 6 is set to be greater than the exhaust pressure of the second air compressor 11, so as to ensure that when the demand of the end user changes, the nitrogen-rich gas can overflow into the pipeline in the compressed air module through the nitrogen-rich overflow valve 15, thereby optimizing the energy consumption of the gas supply system to the greatest extent and improving the overall operating efficiency of the gas supply system.

[0091] The present invention and its embodiments are schematically described above. The description is not restrictive. What is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if those of ordinary skill in the art are inspired by it and design similar structural modes and embodiments without creative efforts without departing from the purpose of the present invention, they shall fall within the protection scope of the present invention.

Claims

1. An integrated multi-gas supply system, characterized in that, Comprising: An oxygen-enriched compression assembly, which includes a first filter, an oxygen-enriched compressor, a first post-treatment unit, and an oxygen-enriched gas storage tank connected in sequence; An air separation assembly, which includes a second filter, a first air compressor, a second post-treatment unit, a membrane separation assembly, and a nitrogen-enriched gas storage tank connected in sequence. The membrane separation assembly is used to separate oxygen-enriched gas and nitrogen-enriched gas from air, and the oxygen-enriched gas separated by the membrane separation assembly is refluxed to the oxygen-enriched compression assembly; An air compression assembly, which includes a third filter, a second air compressor, a third post-treatment unit, and a compressed air storage tank connected in sequence; Wherein, the first post-treatment unit is connected to the compressed air storage tank, and an oxygen-enriched overflow valve is provided on the pipeline between the first post-treatment unit and the compressed air storage tank. The oxygen-enriched finished gas processed by the first post-treatment unit is transported to the oxygen-enriched gas storage tank or overflows to the compressed air storage tank through the oxygen-enriched overflow valve; the membrane separation assembly is connected to the compressed air storage tank, and a nitrogen-enriched overflow valve is provided on the pipeline between the membrane separation assembly and the compressed air storage tank. The nitrogen-enriched gas separated by the membrane separation assembly is transported to the nitrogen-enriched gas storage tank or overflows to the compressed air storage tank through the nitrogen-enriched overflow valve; There are multiple groups of the air compression assemblies, and multiple groups of the air compression assemblies are connected in parallel; The exhaust pressure of the first air compressor is greater than the exhaust pressure of the second air compressor.

2. The integrated multi-gas supply system according to claim 1, characterized in that A branch pipeline is provided on the membrane separation assembly, and an oxygen-enriched outlet valve is provided on the branch pipeline.

3. The integrated multi-gas supply system according to claim 1, wherein A main control fluid control valve is provided on the pipeline between the second air compressor and the third post-treatment unit, and the main control fluid control valve is close to the third post-treatment unit.

4. The integrated multi-gas supply system according to claim 3, wherein, A first gas pressure sensor and a first gas flow sensor are provided at the inlet of the third post-treatment unit, and a second gas pressure sensor and a second gas flow sensor are provided at the outlet of the third post-treatment unit.

5. The integrated multi-gas supply system according to claim 1, wherein, When the oxygen-enriched compressor, the first air compressor or the second air compressor is a centrifugal air compressor or an oil-free screw compressor, the corresponding first post-treatment unit, the second post-treatment unit or the third post-treatment unit is an integrated multi-mode intelligent and efficient dryer; or, when the oxygen-enriched compressor, the first air compressor or the second air compressor is an oil-injected screw compressor or a water-injected screw compressor, the corresponding first post-treatment unit, the second post-treatment unit or the third post-treatment unit is a blast zero-air-consumption dryer, and a fourth filter is provided on the blast zero-air-consumption dryer.

6. The integrated multi-gas supply system according to claim 1, wherein The membrane separation assembly has an air inlet, a nitrogen-enriched gas outlet and an oxygen-enriched gas outlet. A compressed air pressure sensor and a compressed air flow sensor are provided at the air inlet, a nitrogen-enriched pressure sensor, a nitrogen-enriched flow sensor, and a nitrogen-enriched concentration sensor are provided at the nitrogen-enriched gas outlet, and an oxygen-enriched pressure sensor, a first oxygen-enriched flow sensor, and a first oxygen-enriched concentration sensor are provided at the oxygen-enriched gas outlet.

7. The integrated multi-gas supply system according to claim 6, characterized in that, The temperature of the compressed air at the air inlet of the membrane separation module is 40 - 60 °C.

8. The integrated multi-gas supply system according to claim 1, characterized in that, The membrane separation module is connected to the pipeline between the first filter and the oxygen-enriched compressor. An air flow sensor and an oxygen concentration sensor are provided at the air outlet of the first filter. A second oxygen-enriched flow sensor and a second oxygen-enriched concentration sensor are provided on the pipeline connecting the membrane separation module to the pipeline between the first filter and the oxygen-enriched compressor. A mixed gas flow sensor and a total oxygen concentration sensor are provided at the air outlet of the oxygen-enriched compressor.

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