CN109422249B

CN109422249B - Air separator

Info

Publication number: CN109422249B
Application number: CN201710715518.7A
Authority: CN
Inventors: 刘伟; 王海波; 廖昌建; 戴金玲; 李经伟
Original assignee: China Petroleum and Chemical Corp; Sinopec Dalian Research Institute of Petroleum and Petrochemicals
Current assignee: Sinopec Dalian Petrochemical Research Institute Co ltd; China Petroleum and Chemical Corp
Priority date: 2017-08-20
Filing date: 2017-08-20
Publication date: 2020-05-19
Anticipated expiration: 2037-08-20
Also published as: CN109422249A

Abstract

The invention discloses an air separator which comprises an air entraining section and an oxygen-enriched separation section according to the flowing direction of air, wherein one side of the air entraining section is provided with an air inlet, and a shell of the oxygen-enriched separation section is provided with an oxygen-enriched airflow outlet and a nitrogen-enriched airflow outlet; an air filter and a blower are arranged in the air-entraining section; be provided with a shielding section of thick bamboo in the oxygen boosting separation section, a shielding section of thick bamboo forms concentric sleeve structure with the casing of oxygen boosting separation section, is provided with the fixed axle in the shielding section of thick bamboo, fixed axle and air-blower fixed connection set up the oxygen boosting subassembly at the interval on the fixed axle, the interval is provided with the corona subassembly in the shielding section of thick bamboo. The air separator has the effects of oxygen enrichment and dehumidification, and also has the advantages of safety, reliability, low investment cost and the like.

Description

Air separator

Technical Field

The invention relates to the field of gas separation, in particular to a gas separator for oxygen in air.

Background

The traditional oxygen production method is air cryogenic fractionation, and oxygen and nitrogen with high purity can be produced by the method. However, in many cases, such as waste water treatment, metal smelting, chemical waste gas treatment, etc., high-purity oxygen prepared by cryogenic fractionation is not needed, and the consumption of rich oxygen is relatively large. Therefore, people always pursue more economical and simple oxygen enrichment methods, such as a molecular sieve pressure swing adsorption method and a membrane oxygen enrichment technology.

The membrane method oxygen enrichment is to use an oxygen enrichment membrane to carry out air separation, and the oxygen enrichment membrane technology is advanced and mature. The operating principle of the membrane for separating the air is the selective permeability function of the polymer membrane, so that the membrane is in contact with the air, and under the driving of the pressure difference between the two sides of the membrane, because the oxygen molecules and the nitrogen molecules penetrate through the membrane at different rates, the gas with the high permeation rate is enriched at the permeation side, and the gas with the low permeation rate is enriched at the raw material side, thereby realizing the purpose of separating and purifying the air. The key of the membrane technology is to manufacture a membrane material which has high flux, high selectivity, long service life and easy cleaning. However, in practical application, the problem that the pores of the oxygen-enriched membrane are blocked by dust, impurities and the like exists, so that the service life of the oxygen-enriched membrane is shortened.

Nitrogen in the air on the molecular sieve is a molecule which is preferentially adsorbed, and the pressure swing adsorption method for preparing the oxygen-enriched air is carried out along two paths: on the one hand, the performance of the adsorbent is improved so as to increase the adsorption capacity of nitrogen and the separation coefficient of nitrogen-rich; another aspect is to improve the process flow, and to develop various two-bed and three-bed processes based on oxygen-rich capacity, purity and adsorbent properties, and the increased number of adsorbent beds can increase oxygen production capacity and reduce total electricity consumption, but the complexity of additional investment and increased number of beds is economically prohibitively expensive. So that two-bed and three-bed processes are mostly developed and applied in the industry at present. Because the separation coefficient of oxygen and nitrogen is improved along with the reduction of pressure, the adsorption pressure in the process of preparing oxygen-enriched film by pressure swing adsorption is lower, the power consumption of the process of normal pressure adsorption-vacuum desorption is lower than that of the process of pressure adsorption-normal pressure desorption, the molecular sieve pressure swing adsorption oxygen-enriched method is similar to the oxygen-enriched film oxygen enrichment, and the technology is mature. The voids are larger than those of the oxygen-enriched membrane, but the same problem of clogging of the molecular sieve pores also exists. The blockage of the molecular sieve pores is required to be replaced, which causes great waste of resources and great consumption of cost.

The magnetic method oxygen enrichment technology is the most advanced technology for preparing oxygen-enriched air by the oxygen-enriched combustion energy-saving technology at present, and has the advantages of wide application range, long service life, low energy consumption and low manufacturing cost of the oxygen-enriched air. The method fundamentally solves the defects of the membrane oxygen enrichment method and the molecular sieve pressure swing adsorption oxygen enrichment method at the present stage: such as oxygen-rich membranes and molecular sieves. The principle of the magnetic oxygen enrichment is that different paramagnetism and diamagnetism of oxygen molecules and nitrogen molecules are utilized, so that the two gas molecules are deflected in different directions through a high-magnetism magnetic field to obtain oxygen-enriched air and nitrogen-enriched air, the nitrogen-enriched air is discharged, and the rest is the required oxygen-enriched air. The primary oxygen enrichment concentration of the magnetic oxygen enrichment can reach 26% -30%, and the primary oxygen enrichment concentration can be connected in series in multiple stages, so that the oxygen enrichment concentration can reach a higher level.

Patent CN101020569A discloses a magnetic oxygen-enriched air machine, which mainly comprises an oxygen permeable layer and an oxygen-enriched air pump, wherein the air pump is provided with a diversion cover with a rotating magnetic field, and the magnetic force generated by the rotating magnetic field is used to effectively guide the oxygen gathered on an oxygen gathering device into the air pump, but the magnetic oxygen-enriched air machine has the problems of low oxygen-enriched concentration, small oxygen-enriched air amount and the like.

Patent CN101857200A discloses a novel combination formula magnetic force oxygen boosting device, and the oxygen boosting device adopts tertiary series connection oxygen boosting, improves oxygen purity step by step, nevertheless has oxygen concentration in the actual operation in-process and is higher, and the more difficult problem that breaks away from the magnetic field of oxygen.

Disclosure of Invention

The invention aims to provide an air separator which can realize the functions of oxygen enrichment and dehumidification and has the advantages of simple equipment, safety, reliability, low investment cost and the like.

The invention provides an air separator which comprises an air entraining section and an oxygen-enriched separation section according to the flowing direction of air, wherein one side of the air entraining section is provided with an air inlet, and a shell of the oxygen-enriched separation section is provided with an oxygen-enriched airflow outlet and a nitrogen-enriched airflow outlet; an air filter and a blower are arranged in the air-entraining section; be provided with a shielding section of thick bamboo in the oxygen boosting separation section, a shielding section of thick bamboo forms concentric sleeve structure with the casing of oxygen boosting separation section, is provided with the fixed axle in the shielding section of thick bamboo, fixed axle and air-blower fixed connection, the interval sets up the oxygen boosting subassembly on the fixed axle, the interval is provided with corona assembly in the shielding section of thick bamboo, corona assembly includes that a plurality of is fixed in the corona rod on the shielding section of thick bamboo inner wall, corona rod along shielding section of thick bamboo internal diameter direction evenly distributed sets up 4~20 corona rods, and preferred setting is 8~16 corona rods, the one end of a plurality of corona rod is fixed on the inner wall of a shielding section of thick bamboo, and the other end radially stretches to the fixed axle along a shielding section of thick bamboo, and fixed axle surface between be provided with the clearance, the corona rod is close to the one.

In the air separator, the air-entraining section, the blower, the shielding cylinder, the fixed shaft and the oxygen-enriched separation section are concentric shafts.

Among the above-mentioned air separator, according to the gas flow direction, set up corona subassembly and oxygen boosting subassembly (according to the gas flow direction, corona subassembly is in the front of the oxygen boosting subassembly) at the interval in proper order in the oxygen boosting separation section, corona subassembly and the distance at oxygen boosting subassembly center are 1~3 times, preferred 1.5~2.5 times of magnetic assembly length.

In the air separator, the oxygen enrichment assembly comprises a magnetic assembly and an impeller, the magnetic assembly is of a circular ring cylinder structure, the magnetic assembly is fixed on the fixing shaft, if the magnetic assembly is fixed on the fixing shaft through a rivet, the length of the magnetic assembly is 3-10 times, preferably 5-8 times, of the radius of the fixing shaft.

In the air separator, the oxygen enrichment assembly in the oxygen enrichment separation section is provided with the impeller, the impeller is fixed on the magnetic assembly and comprises 2-8 blades, preferably 4-6 blades, and the blades are uniformly distributed on the outer surface of the magnetic assembly.

In the air separator, a magnetic field transformation assembly is arranged in the oxygen-enriched separation section, and is arranged between the oxygen-enriched assembly and the corona assembly and behind the oxygen-enriched assembly according to the flowing direction of the gas. The magnetic field conversion component can be a magnetic shielding body circular cylinder structure formed by iron, manganese and alloy thereof, and also can be a circular cylinder structure formed by a magnetic body, and when the magnetic field conversion component is the circular cylinder structure formed by the magnetic body, the S pole of the magnetic field conversion component is correspondingly installed with the S pole of the magnetic component of the oxygen enrichment component. The length of the magnetic field transformation assembly is 1/3-2/3 of the length of the magnetic assembly, and preferably 1/2; the center distance between the magnetic field transformation assembly and the oxygen enrichment assembly is 1-3 times, preferably 1.5-2 times, the length of the magnetic assembly, and the magnetic field transformation assembly can be fixed on the fixing shaft through rivets.

In the air separator, the wall of the shielding cylinder is provided with holes, and the aperture ratio is 30-50%.

In the air separator, the fixed shaft is fixedly connected with the rotating shaft of the air blower, and the rotating shaft of the air blower drives the fixed shaft to rotate together.

In the above-mentioned air separator, air cleaner can adopt bolted connection on being fixed in the casing of bleed section, and air cleaner's filter screen material adopts one or several kinds in stainless wire net, inorganic fiber, the ceramic fibre, preferred stainless wire net, and the filter screen aperture is 2mm ~10 mm, preferred 4mm ~8 mm.

In the air separator, the blower can adopt an axial flow fan and a circular pipeline fan, the blower is fixed on the shell of the air entraining section, and preferably, the axis of the blower is superposed with the central line of the air entraining section. The inlet pressure of the blower is-0.1 kPa to-0.5 kPa, preferably-0.1 kPa to-0.3 kPa; the outlet pressure of the blower is 5 to 20kPa, preferably 8 to 15 kPa.

In the air separator, the shielding cylinder, the air entraining section shell and the oxygen-enriched separation section shell are made of materials capable of shielding a magnetic field, such as iron, manganese and alloys thereof.

Compared with the prior art, the air separator has the following advantages:

the air separator can ionize components in the air by arranging the corona rod at the oxygen enrichment separation section, particularly, the corona rod can ionize water contained in the air, the aim of removing water in the air is fulfilled while the oxygen enrichment efficiency is improved, and the air separator has the effects of oxygen enrichment and dehumidification; the impeller arranged in the air separator is beneficial to separating oxygen-enriched air flow from a magnetic field, and the problem that oxygen enrichment is easy to deoxidize is difficult is solved; the oxygen enrichment section is provided with a multi-stage ionization-magnetic field oxygen enrichment stage, so that the concentration of the enriched oxygen can be improved, and the outlet concentration of the oxygen-enriched air flow can reach 30% -35%.

According to the air separator, the magnetic field transformation assembly is arranged on the oxygen enrichment separation section, so that the magnetic field distribution and the magnetic field intensity in the oxygen enrichment separation section are changed, the separation effect of oxygen in a magnetic field is improved, and the problem that oxygen is difficult to separate from the magnetic field in the magnetic method oxygen enrichment process is solved.

The air separator has the characteristics of safety, reliability, simple equipment, low investment and the like.

Drawings

Fig. 1 is a schematic structural diagram of an air separator of the present invention.

FIG. 2 is a schematic view of the connection of the impeller, magnet assembly and stationary shaft.

FIG. 3 is a schematic view of a magnetic field distribution of a magnetic assembly.

Figure 4 is a side view of a corona assembly.

Fig. 5 is a second structural schematic diagram of the air separator of the present invention.

Detailed Description

The following description will further illustrate specific aspects of the present invention by referring to the drawings and specific examples, but not limited to the following examples.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "top", "bottom", and the like indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "provided", "disposed", "connected", "mounted", and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.

As shown in fig. 1, 2 and 3, the invention provides an air separator, which comprises a bleed air section 14 and an oxygen-enriched separation section 15 according to the flow direction of air, wherein one side of the bleed air section 14 is provided with an air inlet 1, and a shell of the oxygen-enriched separation section 15 is provided with an oxygen-enriched air flow outlet 8 and a nitrogen-enriched air flow outlet 7; an air filter 2 and a blower 3 are arranged in the air-entraining section 14; air cleaner 2 is fixed in on the casing of bleed section 14, can adopt bolted connection, and air cleaner 2's filter screen material adopts one or several kinds among stainless wire net, inorganic fiber, ceramic fiber, preferred stainless wire net, and the filter screen aperture is 2mm ~10 mm, preferred 4mm ~8 mm. The air blower 3 can adopt an axial flow fan and a circular pipeline fan, the air blower 3 is fixed on a shell of the air entraining section 14, and preferably, the axis of the air blower 3 is superposed with the central line of the air entraining section 14. The inlet pressure of the blower 3 is-0.1 kPa to-0.5 kPa, preferably-0.1 kPa to-0.3 kPa; the outlet pressure of the blower 3 is 5kPa to 20kPa, preferably 8kPa to 15 kPa. The oxygen enrichment separation section 15 is internally provided with a shielding cylinder 6, the wall of the shielding cylinder 6 is provided with a circular hole, and the aperture ratio is 30-50%. The shielding cylinder 6 and the shell 9 of the oxygen-enriched separation section 15 form a sleeve structure, a fixed shaft 11 is arranged in the shielding cylinder 6, the fixed shaft 11 is fixedly connected with the blower 3, and the fixed shaft 11 is driven by the rotating shaft of the blower 3 to rotate together. The oxygen enrichment assembly 13 is arranged on the fixing shaft 11 at intervals, the oxygen enrichment assembly 13 comprises a magnetic assembly 4 and an impeller 10, the magnetic assembly 4 is of a circular cylinder structure, the magnetic assembly 4 is fixed on the fixing shaft 11 through rivets, and the length of the magnetic assembly 4 is 3-10 times, preferably 5-8 times, of the radius of the fixing shaft. The impeller 10 is fixed on the magnetic component 4, the impeller 10 comprises 2-8 blades, preferably 4-6 blades, and the blades are uniformly distributed on the outer surface of the magnetic component 4. The interval is provided with corona subassembly 5 in the shielding section of thick bamboo 6, corona subassembly 5 includes that a plurality of is fixed in corona rod 16 on the 6 inner walls of shielding section of thick bamboo, corona rod 16 is along 6 internal diameter direction evenly distributed of shielding section of thick bamboo, and corona subassembly 5 sets up 4~20 corona rod 16, and preferred setting 8~16 corona rod 16, the one end of a plurality of corona rod 16 is fixed on the inner wall of shielding section of thick bamboo 6, and the other end radially stretches to fixed axle 11 along shielding section of thick bamboo 6, and is provided with the clearance between the 11 surfaces of fixed axle, corona rod 16 is close to the one end of fixed axle 11 and the distance between the 11 surfaces of fixed axle is 10~50mm, preferred 20~35 mm. The corona component 5 and the oxygen-enriched component 13 are sequentially arranged in the oxygen-enriched separation section 15 at intervals (namely, the corona component 5 is arranged in front of the oxygen-enriched component 13 according to the gas flowing direction), and the distance between the corona component 5 and the center of the oxygen-enriched component 13 is 1-3 times, preferably 1.5-2.5 times, of the length of the magnetic component 4. In the air separator, the air-entraining section 14, the blower 3, the shielding cylinder 6, the fixed shaft 11 and the oxygen-enriched separation section 15 are concentric.

As shown in fig. 4 and 5, the present invention provides a second form of air separator, compared with the air separator shown in fig. 1, the air separator oxygen enrichment separation section 15 is further provided with a magnetic field transformation assembly 12, and the magnetic field transformation assembly 12 is arranged between the oxygen enrichment assembly 13 and the corona assembly 5 and behind the oxygen enrichment assembly 4 according to the gas flow direction. The magnetic field transformation assembly 12 may be a circular cylinder structure composed of magnetic shielding bodies made of iron, manganese and alloys thereof, or a circular cylinder structure composed of magnetic bodies, and when the magnetic field transformation assembly is a circular cylinder structure composed of magnetic bodies, the S pole of the magnetic field transformation assembly is installed corresponding to the S pole of the magnetic assembly of the oxygen enrichment assembly. The length of the magnetic field transformation component 12 is 1/3-2/3, preferably 1/2, of the length of the oxygen enrichment component 13; the central distance between the magnetic field transformation component 12 and the oxygen enrichment component 13 is 1-3 times, preferably 1.5-2 times, the length of the magnetic component 4, and the magnetic field transformation component 12 can be fixed on the fixed shaft 11 through rivets.

The working process of the air separator is as follows: air is introduced by a blower 3 in an air separator, air enters the blower 3 from an air inlet 1 through an air filter 2 to be pressurized, pressurized air flows through a corona component 5 to generate ionization, so that part of air is electrified to be beneficial to oxygen enrichment, ionized air flows through an oxygen enrichment component 13, oxygen is enriched to the surface of an annular magnetic component 4 due to paramagnetism of the oxygen, the oxygen-enriched air flows through a magnetic field transformation component 12 under the pushing action of an impeller 10, the magnetic field direction of the magnetic component 4 is changed under the action of the magnetic field transformation component 12, the situation that the oxygen-enriched air flow is enriched at the S pole of the magnetic component 4 and is difficult to separate is avoided, the oxygen-enriched air sequentially enters the next ionization-magnetic field oxygen enrichment stage, and the oxygen-enriched air flow is discharged from an outlet; the nitrogen gas entering the magnetic field is gathered in the direction of the shell 9 through the sieve holes of the shielding cylinder 6 due to the action of the diamagnetism and the centrifugal force of the impeller 10, and the nitrogen-rich gas flow is discharged from the outlet 7.

Example 1

The air separator in figure 1 is adopted, the filter screen of the air filter 2 is made of a stainless steel wire mesh, the aperture of the filter screen is 4mm,the blower 3 is an axial flow fan, the inlet pressure of the blower 3 is-0.1 kPa, and the outlet pressure of the blower 3 is 10 kPa. The wall of the shielding cylinder 6 is provided with a round hole with the aperture ratio of 50 percent. The length of the magnet assembly 4 is 8 times the radius of the fixed shaft. The device comprises 10 blades of an impeller, 6 blades of an impeller, 12 corona rods 16 arranged on a corona component 5, wherein the distance between one end, close to a fixed shaft 11, of each corona rod 16 and the outer surface of the fixed shaft 11 is 35m, air is filtered by a filter 2, then is pressurized to 10kPa by an air blower 3 and enters an ionization-magnetic field oxygen enrichment section, the ionization-magnetic field oxygen enrichment section is set to be 4-level, and the oxygen concentration of oxygen-enriched airflow is 33% after the air is subjected to ionization-magnetic field oxygen enrichment. The oxygen-enriched energy consumption of the magnetic method is 0.0025 kW.h/Nm³。

Example 2

The air separator in FIG. 5 is adopted, the filter screen of the air filter 2 is made of a stainless steel wire mesh, the aperture of the filter screen is 4mm, the air blower 3 is an axial flow fan, the inlet pressure of the air blower 3 is-0.1 kPa, and the outlet pressure of the air blower 3 is 8 kPa. The wall of the shielding cylinder 6 is provided with a round hole with the aperture ratio of 50 percent. The length of the magnet assembly 4 is 8 times the radius of the fixed shaft. The impeller 10 has 4 blades, the corona component 5 is provided with 16 corona rods 16, and the distance between one end of each corona rod 16 close to the fixed shaft 11 and the outer surface of the fixed shaft 11 is 35 mm. The distance between the corona component 5 and the center of the oxygen enrichment component 13 is 2 times of the length of the magnetic component 4. The magnetic field transformation component 12 adopts a magnetic shielding body, and the length of the magnetic field transformation component 12 is 1/2 of that of the oxygen enrichment component 13; the magnetic field transformation assembly 12 and the oxygen enrichment assembly 13 are both centered at a distance 2 times the length of the magnetic assembly 4. Air is pressurized to 8kPa by a blower 3 after being filtered by a filter 2 and enters an ionization-magnetic field oxygen enrichment section which is set to 4 levels, and the oxygen concentration of oxygen-enriched airflow after the air is subjected to ionization-magnetic field oxygen enrichment is 34 percent. The magnetic shielding body is arranged at the oxygen enrichment separation section 15, so that the problem that oxygen is difficult to separate from a magnetic field in the magnetic method oxygen enrichment process is solved, and the energy consumption in the oxygen enrichment process can be effectively reduced. The oxygen-enriched energy consumption of the magnetic method is 0.0023 kW.h/Nm³。

The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air separator comprises an air entraining section and an oxygen-enriched separation section according to the gas flowing direction, wherein a gas inlet is formed in one side of the air entraining section, and an oxygen-enriched airflow outlet and a nitrogen-enriched airflow outlet are formed in a shell of the oxygen-enriched separation section; a gas filter and a blower are arranged in the gas-guiding section; be provided with a shielding section of thick bamboo in the oxygen boosting separation section, a shielding section of thick bamboo forms concentric sleeve structure with the casing of oxygen boosting separation section, is provided with the fixed axle in the shielding section of thick bamboo, fixed axle and air-blower fixed connection, the interval sets up the oxygen boosting subassembly on the fixed axle, the interval is provided with corona subassembly in the shielding section of thick bamboo, corona subassembly includes that a plurality of is fixed in the corona rod on the shielding section of thick bamboo inner wall, corona rod is along shielding section of thick bamboo internal diameter direction evenly distributed, the one end of a plurality of corona rod is fixed on the inner wall of a shielding section of thick bamboo, and the other end radially stretches to the fixed axle along a shielding section of thick bamboo, and be provided with the clearance between the fixed axle surface, be provided with magnetic field transformation subassembly in the oxygen boosting.

2. The air separator according to claim 1, wherein a corona component and an oxygen-enriched component are sequentially arranged in the oxygen-enriched separation section at intervals according to the gas flow direction, and the distance between the corona component and the center of the oxygen-enriched component is 1-3 times of the length of the magnetic component.

3. The air separator as claimed in claim 1 or 2, wherein a corona component and an oxygen-enriched component are sequentially arranged in the oxygen-enriched separation section at intervals according to the gas flow direction, and the distance between the corona component and the center of the oxygen-enriched component is 1.5-2.5 times of the length of the magnetic component.

4. The air separator according to claim 1, wherein the oxygen enrichment assembly comprises a magnetic assembly and an impeller, the magnetic assembly is of a circular cylinder structure, the magnetic assembly is fixed on the fixed shaft, and the length of the magnetic assembly is 3-10 times of the radius of the fixed shaft.

5. The air separator according to claim 1 or 4, wherein the oxygen enrichment assembly comprises a magnetic assembly and an impeller, the magnetic assembly is of a circular cylinder structure, the magnetic assembly is fixed on the fixed shaft, and the length of the magnetic assembly is 5-8 times of the radius of the fixed shaft.

6. The air separator as claimed in claim 1, wherein an impeller is arranged on the oxygen enrichment assembly in the oxygen enrichment separation section, the impeller is fixed on the magnetic assembly and comprises 2-8 blades, and the blades are uniformly distributed on the outer surface of the magnetic assembly.

7. Air separator according to claim 6, wherein the impeller comprises 4-6 vanes.

8. Air separator according to claim 1, wherein the magnetic field transformation assembly is a magnetically shielded circular cylindrical structure of iron, manganese and alloys thereof, or a magnetic circular cylindrical structure.

9. The air separator as claimed in claim 8, wherein when the magnetic field transformation assembly has a circular cylindrical structure formed of a magnetic body, the S pole thereof is installed to correspond to the S pole of the magnetic assembly of the oxygen enrichment assembly.

10. The air separator according to claim 4, wherein the length of the magnetic field transformation assembly is 1/3-2/3 of the length of the magnetic assembly, the central distance between the magnetic field transformation assembly and the oxygen enrichment assembly is 1-3 times of the length of the magnetic assembly, and the magnetic field transformation assembly is fixed on the fixing shaft.

11. Air separator according to claim 4 or 10, wherein the length of the magnetic field transformation assembly is 1/2 of the length of the magnetic assembly; the center distance between the magnetic field transformation assembly and the oxygen enrichment assembly is 1.5-2 times of the length of the magnetic assembly, and the magnetic field transformation assembly is fixed on the fixing shaft.

12. The air separator of claim 1, wherein the wall of the shielding cylinder is provided with holes, and the hole opening rate is 30-50%.

13. The air separator of claim 1, wherein the corona assembly comprises 4-20 corona rods fixed on the inner wall of the shielding cylinder.

14. The air separator of claim 1, wherein the corona assembly comprises 8-16 corona rods fixed on the inner wall of the shielding cylinder.

15. The air separator according to claim 1, wherein the distance between one end of the corona rod close to the fixed shaft and the outer surface of the fixed shaft is 10-50 mm.

16. The air separator according to claim 1, wherein the distance between one end of the corona rod close to the fixed shaft and the outer surface of the fixed shaft is 20-35 mm.

17. The air separator as claimed in claim 1, wherein the fixing shaft is fixedly coupled to a rotation shaft of the blower, and the fixing shaft is rotated together by the rotation shaft of the blower.

18. The air separator as claimed in claim 1, wherein the air filter is fixed on a shell of the air entraining section, a filter screen of the air filter is made of one or more of a stainless steel wire mesh, inorganic fibers and ceramic fibers, and the aperture of the filter screen is 2 mm-10 mm.

19. The air separator as claimed in claim 18, wherein a filter screen of the air filter is made of a stainless steel wire mesh, and the aperture of the filter screen is 4 mm-8 mm.

20. Air separator according to claim 1, wherein the blower is an axial fan or a circular duct fan, the blower being fixed to the housing of the bleed air section, the axis of the blower coinciding with the centre line of the bleed air section.

21. Air separator according to claim 1, wherein the inlet pressure of the blower is between-0.1 kPa and-0.5 kPa and the outlet pressure of the blower is between 5kPa and 20 kPa.

22. Air separator according to claim 1, wherein the inlet pressure of the blower is between-0.1 kPa and-0.3 kPa; the outlet pressure of the blower is 8kPa to 15 kPa.