A superconducting magnetic separation sewage treatment system and method with self-cleaning function

Abstract

The present invention discloses a superconducting magnetic separation sewage treatment system and method with a self-cleaning function, which relates to the technical field of sewage treatment, wherein the system includes: a superconducting magnet, a front-stage filter, a magnetic separation cavity, a rear-stage connecting pipe, an air compressor, an air-cooled compressor and a control cabinet; the superconducting magnet includes: a refrigerator cold head, a vacuum dewar shell, a cold screen and a superconducting coil winding; the magnetic separation cavity includes: a magnetic separation cavity shell, a magnetic filter, a magnetic material separation cavity and a magnetic pollutant discharge port. The present application generates a uniform magnetic field and a gradient magnetic field inside the magnetic separation cavity through a superconducting coil winding, so that after the magnetic pollutants are adsorbed on the magnetic filter, they can automatically move to the magnetic material separation cavity and be discharged under the action of the gradient magnetic field, thereby realizing the self-cleaning of the magnetic filter and improving the fluency and efficiency of the superconducting magnetic separation sewage treatment.

Description

Technical Field

[0001] The present application relates to the technical field of sewage treatment, and in particular to a superconducting magnetic separation sewage treatment system and method with a self-cleaning function. Background Art

[0002] Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, medical treatment, and catering. For magnetic pollutants and non-magnetic fine particles, permanent magnets or electromagnets are generally used to separate magnetic pollutants from wastewater, and nano-magnetic powder is used to separate non-magnetic fine particles from wastewater. Therefore, it is necessary to study the magnetic separation wastewater treatment system.

[0003] In the prior art, Chinese patent CN118125573A discloses a mobile sewage superconducting magnetic separation system and separation method, including an installation platform, a superconducting magnet is arranged at the center of the surface of the installation platform, a chiller and a helium compressor are symmetrically arranged on the outside of one end of the superconducting magnet, and an air compressor is arranged at the center of the outside of the other end of the superconducting magnet; a magnetic separation cavity is movably connected inside the superconducting magnet, and the end of the magnetic separation cavity close to the helium compressor is connected to a front-stage filtering mechanism, and the other end of the magnetic separation cavity is connected to a rear-stage connecting pipe, and a magnetic separation cavity is arranged inside the magnetic separation cavity, and the two ends of the magnetic separation cavity are detachably connected to magnetic filter screens. Superconducting magnets are used to separate weak magnetic impurities in sewage. The magnet system adopts a curved superconducting magnet structure to solve the problems of large land occupation and high construction cost of the magnetic separation system under the condition of providing the same magnetic field area.

[0004] During the use of the above-mentioned prior art, when the magnetic pollutants on the magnetic filter are adsorbed to a large extent and a good purification effect cannot be achieved, it is necessary to interrupt the sewage treatment, disassemble the magnetic separation chamber, and manually clean the magnetic filter. As a result, the superconducting magnetic separation sewage treatment system cannot operate uninterruptedly for a long time, and the fluency and efficiency of the superconducting magnetic separation sewage treatment are poor. Summary of the invention

[0005] The present application provides a superconducting magnetic separation sewage treatment system and method with a self-cleaning function, which is used to solve the problem in the prior art that the superconducting magnetic separation sewage treatment system cannot operate uninterruptedly for a long time, and the fluency and efficiency of the superconducting magnetic separation sewage treatment are poor.

[0006] On the one hand, the present application provides a superconducting magnetic separation sewage treatment system with self-cleaning function, including: a superconducting magnet, a front-stage filter, a magnetic separation cavity, a rear-stage connecting pipe, an air compressor, an air-cooled compressor and a control cabinet.

[0007] The superconducting magnet comprises: a refrigerator cold head, a vacuum dewar shell, a cold shield and a superconducting coil winding.

[0008] The magnetic separation chamber comprises: a magnetic separation chamber shell, a magnetic filter screen, a magnetic material separation chamber and a magnetic pollutant discharge port.

[0009] The superconducting magnet is sleeved on the outside of the magnetic separation cavity, one end of the magnetic separation cavity is connected to the front-stage filter, and the other end is connected to the back-stage connecting pipe, the air compressor is connected to the front-stage filter, the air-cooled compressor is connected to the refrigerator cold head, and the control cabinet is electrically connected to the air compressor, the air-cooled compressor, and the superconducting coil winding respectively.

[0010] The cold shield is fixedly arranged on the outside of the superconducting coil winding, the vacuum dewar shell is fixedly arranged on the outside of the cold shield, the refrigerator cold head passes through the vacuum dewar shell and the cold shield, and is connected to the superconducting coil winding in a cooling manner.

[0011] The magnetic filter is fixedly arranged inside the magnetic separation cavity shell, the magnetic material separation cavity is fixedly arranged at the bottom of the magnetic separation cavity shell, and the magnetic pollutant discharge port is located at one side of the magnetic material separation cavity.

[0012] The superconducting coil winding is used to generate a uniform magnetic field and a gradient magnetic field inside the magnetic separation cavity.

[0013] In a possible implementation, the superconducting coil winding includes: a gradient magnetic field winding, a gradient magnetic field skeleton, a uniform magnetic field winding, and a uniform magnetic field skeleton.

[0014] The gradient magnetic field winding is wound on the gradient magnetic field frame, the uniform magnetic field winding is wound on the uniform magnetic field frame, and the gradient magnetic field winding and the gradient magnetic field frame are located outside or inside the uniform magnetic field winding and the uniform magnetic field frame.

[0015] The gradient magnetic field winding is used to generate a gradient magnetic field inside the magnetic separation cavity.

[0016] The uniform magnetic field winding is used to generate a uniform magnetic field inside the magnetic separation cavity.

[0017] In a possible implementation manner, the gradient magnetic field winding includes: a first gradient sub-winding and a second gradient sub-winding.

[0018] The first gradient sub-winding and the second gradient sub-winding are respectively wound on the upper side and the lower side of the gradient magnetic field skeleton.

[0019] The first gradient sub-winding and the second gradient sub-winding are used together to generate a gradient magnetic field inside the magnetic separation cavity.

[0020] In a possible implementation manner, the uniform magnetic field winding is connected in series with a first superconducting closed-loop switch.

[0021] The gradient magnetic field winding is connected in series with a second superconducting closed-loop switch.

[0022] In a possible implementation, the front-stage filter includes: a front-stage filter tube, a high-pressure air valve, a front-stage filter screen and a discharge valve.

[0023] The front-stage filter screen is fixedly arranged inside the front-stage filter tube, the high-pressure gas valve is fixedly arranged on the top of the front-stage filter tube, and the discharge valve is fixedly arranged on the bottom of the front-stage filter tube.

[0024] In a possible implementation, both the superconducting magnet and the magnetic separation cavity adopt an arc-shaped structure.

[0025] In a possible implementation, the vacuum dewar shell is made of ferromagnetic material.

[0026] On the other hand, the present application provides a sewage treatment method of a superconducting magnetic separation sewage treatment system with a self-cleaning function, comprising the following steps:

[0027] Step 1: passing the sewage mixed with nano magnetic powder into a pre-filter for preliminary filtration to obtain primary filtered sewage.

[0028] Step 2: The pre-filtered sewage is passed into the magnetic separation chamber. The magnetic filter in the magnetic separation chamber is magnetized under the action of a uniform magnetic field, and the magnetic pollutants in the pre-filtered sewage are adsorbed on the magnetic filter. The magnetic pollutants are moved to the interior of the magnetic material separation chamber under the action of the gradient magnetic field and discharged from the magnetic pollutant discharge port.

[0029] Step 3: The sewage purified by the magnetic separation chamber is discharged from the rear connecting pipe.

[0030] The superconducting magnetic separation sewage treatment system and method with self-cleaning function in the present application has the following advantages:

[0031] A uniform magnetic field and a gradient magnetic field are generated inside the magnetic separation cavity through superconducting coil windings, so that after the magnetic pollutants are adsorbed on the magnetic filter, they can automatically move to the magnetic material separation cavity and be discharged under the action of the gradient magnetic field, thereby realizing the self-cleaning of the magnetic filter and improving the fluency and efficiency of superconducting magnetic separation sewage treatment.

[0032] The proposed uniform magnetic field winding is connected in series with a first superconducting closed-loop switch, and the gradient magnetic field winding is connected in series with a second superconducting closed-loop switch. The power-off closed-loop operation of the uniform magnetic field winding and the gradient magnetic field winding is achieved through superconducting closed-loop switch technology, which is more energy-efficient and convenient for long-term stable operation in the wild or other power-deficient environments.

[0033] The proposed superconducting magnet and magnetic separation cavity both adopt an arc-shaped structure, which reduces the system volume and reduces the construction cost.

[0034] The proposed vacuum dewar shell adopts ferromagnetic material, which can reduce the influence of superconducting magnet leakage on the operation of surrounding instruments and equipment, and at the same time improve the uniformity of the uniform magnetic field, thereby improving the stability of magnetization of the magnetic filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0036] Figure 1 A schematic diagram of the overall structure of a superconducting magnetic separation sewage treatment system with a self-cleaning function provided in an embodiment of the present application;

[0037] Figure 2 A schematic diagram of a top view of the superconducting magnet provided in an embodiment of the present application;

[0038] Figure 3 A schematic diagram of the structure of a gradient magnetic field winding provided in an embodiment of the present application;

[0039] Figure 4 A schematic diagram of the structure of a uniform magnetic field winding provided in an embodiment of the present application;

[0040] Figure 5 A schematic diagram of power supply for a superconducting magnet provided in an embodiment of the present application;

[0041] Figure 6 A schematic diagram of the structure of the front-stage filter, magnetic separation chamber and rear-stage connecting pipe provided in an embodiment of the present application.

[0042] Description of reference numerals:

[0043] 1-superconducting magnet, 2-front stage filter, 3-magnetic separation cavity, 4-rear stage connecting pipe, 5-air compressor, 6-air-cooled compressor, 7-control cabinet, 11-refrigeration machine cold head, 12-vacuum dewar shell, 13-cold screen, 14-superconducting coil winding, 141-first gradient sub-winding, 142-second gradient sub-winding, 143-gradient magnetic field skeleton, 144-uniform magnetic field winding, 145-uniform magnetic field skeleton, 146-first superconducting closed-loop switch, 147-second superconducting closed-loop switch, 148-winding power supply, 201-high pressure gas valve, 202-front stage filter, 203-discharge valve, 301-magnetic separation cavity shell, 302-magnetic filter, 303-magnetic material separation cavity, 304-magnetic pollutant discharge outlet, 305-cavity cleaning water inlet. DETAILED DESCRIPTION

[0044] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] like Figures 1 to 6 As shown, an embodiment of the present application provides a superconducting magnetic separation sewage treatment system with a self-cleaning function, including: a superconducting magnet 1, a front-stage filter 2, a magnetic separation cavity 3, a rear-stage connecting pipe 4, an air compressor 5, an air-cooled compressor 6 and a control cabinet 7.

[0046] The superconducting magnet 1 comprises a refrigerator cold head 11 , a vacuum dewar housing 12 , a cold shield 13 and a superconducting coil winding 14 .

[0047] The magnetic separation chamber 3 comprises: a magnetic separation chamber housing 301 , a magnetic filter screen 302 , a magnetic material separation chamber 303 and a magnetic pollutant discharge port 304 .

[0048] The superconducting magnet 1 is sleeved on the outside of the magnetic separation cavity 3, one end of the magnetic separation cavity 3 is connected to the front-stage filter 2, and the other end is connected to the back-stage connecting pipe 4, the air compressor 5 is connected to the front-stage filter 2, the air-cooled compressor 6 is connected to the refrigerator cold head 11, and the control cabinet 7 is electrically connected to the air compressor 5, the air-cooled compressor 6, and the superconducting coil winding 14 respectively.

[0049] The cold shield 13 is fixedly arranged on the outside of the superconducting coil winding 14 , the vacuum dewar shell 12 is fixedly arranged on the outside of the cold shield 13 , the refrigerator cold head 11 passes through the vacuum dewar shell 12 and the cold shield 13 , and is connected to the superconducting coil winding 14 in a cold conductive manner.

[0050] The magnetic filter 302 is fixedly disposed inside the magnetic separation chamber housing 301 , the magnetic material separation chamber 303 is fixedly disposed at the bottom of the magnetic separation chamber housing 301 , and the magnetic pollutant discharge port 304 is located at one side of the magnetic material separation chamber 303 .

[0051] The superconducting coil winding 14 is used to generate a uniform magnetic field and a gradient magnetic field inside the magnetic separation cavity 3 .

[0052] Specifically, in this embodiment, the magnetic separation cavity 3 is installed in the room temperature hole of the superconducting magnet 1, and the entire superconducting magnetic separation sewage treatment system is integrated in a space smaller than 2m×2m.

[0053] In this embodiment, the front-stage filter 2 is used to perform preliminary filtration on the sewage to obtain primary filtered sewage; the magnetic separation chamber 3 is used to adsorb the magnetic pollutants in the primary filtered sewage on the magnetic filter 302, and the magnetic pollutants move to the inside of the magnetic material separation chamber 303 under the action of the gradient magnetic field, and are discharged from the magnetic pollutant discharge port 304; the rear-stage connecting pipe 4 is used to discharge the sewage purified by the magnetic separation chamber 3; the air compressor 5 is used to provide high-pressure gas for the front-stage filter 2; the air-cooled compressor 6 is used to provide circulating helium for the refrigerator cold head 11; the control cabinet 7 is used to control the air compressor 5 and the refrigerator cold head 11, and control the power on and off of the superconducting coil winding 14; the refrigerator cold head 11 is used to provide cooling for the superconducting coil winding 14; the magnetic filter 302 is used to magnetize under the action of a uniform magnetic field, adsorb the magnetic pollutants in the primary filtered sewage, and the magnetic pollutants move to the inside of the magnetic material separation chamber 303 under the action of the gradient magnetic field, and are discharged from the magnetic pollutant discharge port 304.

[0054] In this embodiment, three magnetic filter screens 302 are provided and all are made of ferromagnetic material, and the three magnetic filter screens 302 are respectively fixedly provided at both ends and the middle of the magnetic separation chamber housing 301. In other possible embodiments, the magnetic filter screens 302 can also be provided in other quantities and positions.

[0055] In a possible embodiment, the magnetic material sorting cavity 303 is provided with a cavity cleaning water inlet 305, which is located on the side of the magnetic material sorting cavity 303 away from the magnetic pollutant discharge port 304, and is used to pass clean water into the magnetic material sorting cavity 303 for cleaning after each sewage treatment, and the cleaned liquid is discharged from the magnetic pollutant discharge port 304.

[0056] Exemplarily, the superconducting coil winding 14 includes: a gradient magnetic field winding, a gradient magnetic field skeleton 143 , a uniform magnetic field winding 144 and a uniform magnetic field skeleton 145 .

[0057] The gradient magnetic field winding is wound on the gradient magnetic field skeleton 143 , the uniform magnetic field winding 144 is wound on the uniform magnetic field skeleton 145 , and the gradient magnetic field winding and the gradient magnetic field skeleton 143 are located outside or inside the uniform magnetic field winding 144 and the uniform magnetic field skeleton 145 .

[0058] The gradient magnetic field winding is used to generate a gradient magnetic field inside the magnetic separation cavity 3 .

[0059] The uniform magnetic field winding 144 is used to generate a uniform magnetic field inside the magnetic separation cavity 3 .

[0060] Exemplarily, the gradient magnetic field winding includes: a first gradient sub-winding 141 and a second gradient sub-winding 142 .

[0061] The first gradient sub-winding 141 and the second gradient sub-winding 142 are respectively wound on the upper side and the lower side of the gradient magnetic field skeleton 143 .

[0062] The first gradient sub-winding 141 and the second gradient sub-winding 142 are used together to generate a gradient magnetic field inside the magnetic separation cavity 3 .

[0063] Specifically, Figure 3 and Figure 4 As shown, in this embodiment, the gradient magnetic field winding and the gradient magnetic field skeleton 143 are located outside the uniform magnetic field winding 144 and the uniform magnetic field skeleton 145, specifically from outside to inside: gradient magnetic field winding, gradient magnetic field skeleton 143, uniform magnetic field winding 144, uniform magnetic field skeleton 145. In other possible embodiments, the gradient magnetic field winding and the gradient magnetic field skeleton 143 may also be located inside the uniform magnetic field winding 144 and the uniform magnetic field skeleton 145.

[0064] In this embodiment, the gradient magnetic field winding includes a first gradient sub-winding 141 on the upper side of the gradient magnetic field skeleton 143 and a second gradient sub-winding 142 on the lower side, and the directions of the current I of the first gradient sub-winding 141 and the second gradient sub-winding 142 are opposite; at the same time, in order to make the magnetic pollutants subject to downward force, the direction of the current of the uniform magnetic field winding 144 needs to be adjusted.

[0065] In other possible embodiments, the gradient magnetic field winding may also be arranged in other ways.

[0066] Specifically, in this embodiment, the force F exerted on the magnetic pollutant is expressed as follows:

[0067] F=V×μM×gradB

[0068] Wherein, V represents the volume of magnetic pollutants, μM represents the magnetization intensity of magnetic pollutants, and gradB represents the magnetic field gradient in the space where magnetic pollutants are located.

[0069] Exemplarily, the uniform magnetic field winding 144 is connected in series with a first superconducting closed-loop switch 146 .

[0070] The gradient magnetic field winding is connected in series with a second superconducting closed-loop switch 147 .

[0071] Specifically, Figure 5 As shown, in this embodiment, the first superconducting closed-loop switch 146 and the second superconducting closed-loop switch 147 both adopt superconducting coils wound on the heating body, and the first superconducting closed-loop switch 146 and the second superconducting closed-loop switch 147 are both connected in parallel with the winding power supply 148, and the winding power supply 148 is located outside the superconducting magnet 1, and the first superconducting closed-loop switch 146 and the second superconducting closed-loop switch 147 are both located inside the superconducting magnet 1. In the cooling stage of the superconducting magnet 1, the first superconducting closed-loop switch 146 and the second superconducting closed-loop switch 147 are cooled to a temperature lower than the superconducting critical temperature together with the uniform magnetic field winding 144 and the gradient magnetic field winding, and enter the superconducting state; before the uniform magnetic field winding 144 and the gradient magnetic field winding are energized, the first superconducting closed-loop switch 146 and the second superconducting closed-loop switch 147 are heated to a temperature higher than the superconducting critical temperature, and exit the superconducting state; at this time, the winding power supply 148 is used to energize the uniform magnetic field winding 144 and the gradient magnetic field winding, and when the required magnetic field strength and magnetic field gradient are reached, the first superconducting closed-loop switch 146 is stopped from being energized. and the second superconducting closed-loop switch 147 are heated to gradually cool down and re-enter the superconducting state, the first superconducting closed-loop switch 146 short-circuits the uniform magnetic field winding 144, and the second superconducting closed-loop switch 147 short-circuits the gradient magnetic field winding; at this time, the winding power supply 148 can be removed, and the unimpeded current-carrying ability of the superconducting materials of the first superconducting closed-loop switch 146 and the second superconducting closed-loop switch 147 is utilized, so that there is no need to energize the uniform magnetic field winding 144 and the gradient magnetic field winding, thereby realizing the power-off closed-loop operation of the uniform magnetic field winding 144 and the gradient magnetic field winding, which is more energy-saving and convenient for long-term stable operation in the wild or other power-deficient environments.

[0072] Exemplarily, the pre-stage filter 2 includes: a pre-stage filter tube, a high-pressure gas valve 201 , a pre-stage filter screen 202 and a discharge valve 203 .

[0073] The front-stage filter screen 202 is fixedly arranged inside the front-stage filter tube, the high-pressure gas valve 201 is fixedly arranged on the top of the front-stage filter tube, and the discharge valve 203 is fixedly arranged on the bottom of the front-stage filter tube.

[0074] Specifically, in this embodiment, the high-pressure air valve 201 is connected to the air compressor 5. When the sewage mixed with nano-magnetic powder is passed into the pre-filter 2 for preliminary filtration, the larger waste (such as sludge and large particles) in the sewage is filtered out through the pre-filter 202. The high-pressure gas provided by the air compressor 5 enters the pre-filter pipe through the high-pressure air valve 201, and the waste preliminarily filtered out is discharged from the discharge valve 203.

[0075] Exemplarily, the superconducting magnet 1 and the magnetic separation cavity 3 both adopt an arc-shaped structure.

[0076] Specifically, the arc-shaped structure can reduce the volume of the system and the construction cost.

[0077] Exemplarily, the vacuum dewar housing 12 is made of ferromagnetic material.

[0078] Specifically, the vacuum dewar housing 12 is made of ferromagnetic material to reduce the influence of the magnetic leakage of the superconducting magnet 1 on the operation of surrounding instruments and equipment, while improving the uniformity of the uniform magnetic field, thereby improving the stability of magnetizing the magnetic filter 302 .

[0079] The present application also provides a sewage treatment method of a superconducting magnetic separation sewage treatment system with a self-cleaning function, comprising the following steps:

[0080] Step 1: The sewage mixed with nano magnetic powder is passed into the pre-filter 2 for preliminary filtration to obtain primary filtered sewage.

[0081] In step 2, the pre-filtered sewage is passed into the magnetic separation chamber 3. The magnetic filter mesh 302 in the magnetic separation chamber 3 is magnetized under the action of a uniform magnetic field, and the magnetic pollutants in the pre-filtered sewage are adsorbed on the magnetic filter mesh 302. The magnetic pollutants are moved to the interior of the magnetic material separation chamber 303 under the action of the gradient magnetic field, and are discharged from the magnetic pollutant discharge port 304.

[0082] Step three, the sewage purified by the magnetic separation chamber 3 is discharged from the rear connecting pipe 4.

[0083] Specifically, Figure 6 As shown, in this embodiment, the sewage mixed with nano magnetic powder is first passed into the pre-stage filter 2 for preliminary filtration, and the pre-stage filter 202 filters out larger wastes in the sewage to obtain pre-filtered sewage. When the waste in the pre-stage filter 2 accumulates to a certain extent, the high-pressure gas valve 201 and the discharge valve 203 are opened, and the high-pressure gas provided by the air compressor 5 enters the pre-stage filter pipe through the high-pressure gas valve 201, and the waste preliminarily filtered out is discharged from the discharge valve 203.

[0084] Before the primary filtered sewage is passed into the magnetic separation chamber 3, the control cabinet 7 has controlled the winding power supply 148 to energize the uniform magnetic field winding 144 and the gradient magnetic field winding, so that a uniform magnetic field and a gradient magnetic field are generated inside the magnetic separation chamber 3, and the magnetic filter 302 has been magnetized by the uniform magnetic field. Therefore, when the primary filtered sewage is passed into the magnetic separation chamber 3, the magnetic filter 302 adsorbs the magnetic pollutants in the primary filtered sewage, and the magnetic pollutants move to the inside of the magnetic material separation chamber 303 under the action of the gradient magnetic field, and are discharged from the magnetic pollutant discharge port 304, thereby realizing the self-cleaning of the magnetic filter 302.

[0085] Finally, the sewage purified by the magnetic separation chamber 3 is discharged from the rear-stage connecting pipe 4.

[0086] The embodiment of the present application generates a uniform magnetic field and a gradient magnetic field inside the magnetic separation chamber 3 through the superconducting coil winding 14, so that after the magnetic pollutants are adsorbed on the magnetic filter 302, they can automatically move to the magnetic material separation chamber 303 and be discharged under the action of the gradient magnetic field, thereby realizing the self-cleaning of the magnetic filter 302 and improving the fluency and efficiency of superconducting magnetic separation sewage treatment.

[0087] The proposed uniform magnetic field winding 144 is connected in series with a first superconducting closed-loop switch 146, and the proposed gradient magnetic field winding is connected in series with a second superconducting closed-loop switch 147. The power-off closed-loop operation of the uniform magnetic field winding 144 and the gradient magnetic field winding is achieved through superconducting closed-loop switch technology, which is more energy-efficient and convenient for long-term stable operation in the wild or other power-deficient environments.

[0088] The proposed superconducting magnet 1 and magnetic separation cavity 3 both adopt an arc-shaped structure, which reduces the system volume and reduces the construction cost.

[0089] The proposed vacuum dewar housing 12 is made of ferromagnetic material, which can reduce the influence of the magnetic leakage of the superconducting magnet 1 on the operation of surrounding instruments and equipment, and at the same time improve the uniformity of the uniform magnetic field, thereby improving the stability of magnetizing the magnetic filter 302.

[0090] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0091] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A superconducting magnetic separation sewage treatment system with self-cleaning function, characterized in that: include: Superconducting magnet, front stage filter, magnetic separation cavity, back stage connecting pipe, air compressor, air-cooled compressor and control cabinet; The superconducting magnet comprises: a refrigerator cold head, a vacuum dewar shell, a cold shield and a superconducting coil winding; The magnetic separation chamber comprises: a magnetic separation chamber housing, a magnetic filter screen, a magnetic material separation chamber and a magnetic pollutant discharge port; The superconducting magnet is sleeved on the outside of the magnetic separation cavity, one end of the magnetic separation cavity is connected to the front-stage filter, and the other end is connected to the back-stage connecting pipe, the air compressor is connected to the front-stage filter, the air-cooled compressor is connected to the refrigerator cold head, and the control cabinet is electrically connected to the air compressor, the air-cooled compressor, and the superconducting coil winding respectively; The cold shield is fixedly arranged on the outside of the superconducting coil winding, the vacuum dewar shell is fixedly arranged on the outside of the cold shield, the cold head of the refrigerator passes through the vacuum dewar shell and the cold shield, and is connected to the superconducting coil winding by cold conduction; The magnetic filter is fixedly arranged inside the magnetic separation chamber shell, the magnetic substance separation chamber is fixedly arranged at the bottom of the magnetic separation chamber shell, and the magnetic pollutant discharge port is located at one side of the magnetic substance separation chamber; The superconducting coil winding is used to generate a uniform magnetic field and a gradient magnetic field inside the magnetic separation cavity; The superconducting coil winding comprises: a gradient magnetic field winding, a gradient magnetic field skeleton, a uniform magnetic field winding and a uniform magnetic field skeleton; The gradient magnetic field winding is wound on the gradient magnetic field skeleton, the uniform magnetic field winding is wound on the uniform magnetic field skeleton, and the gradient magnetic field winding and the gradient magnetic field skeleton are located outside or inside the uniform magnetic field winding and the uniform magnetic field skeleton; The gradient magnetic field winding is used to generate a gradient magnetic field inside the magnetic separation cavity; The uniform magnetic field winding is used to generate a uniform magnetic field inside the magnetic separation cavity; The gradient magnetic field winding comprises: a first gradient sub-winding and a second gradient sub-winding; The first gradient sub-winding and the second gradient sub-winding are respectively wound on the upper side and the lower side of the gradient magnetic field skeleton; The first gradient sub-winding and the second gradient sub-winding are used together to generate a gradient magnetic field inside the magnetic separation cavity; The uniform magnetic field winding is connected in series with a first superconducting closed-loop switch; The gradient magnetic field winding is connected in series with a second superconducting closed-loop switch.

2. A superconducting magnetic separation sewage treatment system with self-cleaning function according to claim 1, characterized in that: The front stage filter comprises: a front stage filter tube, a high pressure air valve, a front stage filter screen and a discharge valve; The front-stage filter screen is fixedly arranged inside the front-stage filter tube, the high-pressure gas valve is fixedly arranged on the top of the front-stage filter tube, and the discharge valve is fixedly arranged on the bottom of the front-stage filter tube.

3. A superconducting magnetic separation sewage treatment system with self-cleaning function according to claim 1, characterized in that: The superconducting magnet and the magnetic separation cavity both adopt an arc structure.

4. A superconducting magnetic separation sewage treatment system with self-cleaning function according to claim 1, characterized in that: The vacuum dewar shell is made of ferromagnetic material.

5. A sewage treatment method of a superconducting magnetic separation sewage treatment system with a self-cleaning function as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Step 1, passing the sewage mixed with nano magnetic powder into a pre-filter for preliminary filtration to obtain primary filtered sewage; Step 2: The pre-filtered sewage is passed into the magnetic separation chamber. The magnetic filter in the magnetic separation chamber is magnetized under the action of a uniform magnetic field, and the magnetic pollutants in the pre-filtered sewage are adsorbed on the magnetic filter. The magnetic pollutants are moved to the inside of the magnetic material separation chamber under the action of a gradient magnetic field, and are discharged from the magnetic pollutant discharge port. Step 3: The sewage purified by the magnetic separation chamber is discharged from the rear connecting pipe.

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