Nonmetal sample induced magnetic field generating device and application thereof

Abstract

The invention discloses a nonmetal sample induced magnetic field generating device and application thereof. The non-metal sample induced magnetic field generating device comprises a sample containing pipe, an induced magnetic field carrier and an induced magnetic field carrier cooling system, at least part of the sample containing pipe is wound outside the induced magnetic field carrier, and the sample containing pipe is used for containing a non-metal sample and allowing the non-metal sample in a fluid state to continuously flow; the induced magnetic field carrier is used for generating a high induced magnetic field, the high induced magnetic field can induce a non-metal sample in the sample placing pipe to generate an induced magnetic field, the induced magnetic field is from the change of physicochemical properties of the non-metal sample, and the induced magnetic field carrier cooling system is in heat conduction fit with the induced magnetic field carrier. And at least the temperature of the induced magnetic field carrier is kept at the working temperature.

Description

Technical Field

[0001] The invention particularly relates to a non-metallic sample induced magnetic field generating device and application thereof, belonging to the technical field of non-metallic sample processing. Background Art

[0002] In recent years, with the advancement of sustainable development needs and green new quality production concepts in the fields of materials, chemical industry, biology, food and medicine, a series of new processing technologies, such as ultra-high voltage, terahertz and magnetic field processing, have begun to emerge and have been widely used in various fields. Among them, magnetic field processing has attracted the attention of researchers and business practitioners because of its environmental friendliness and strong penetration into non-metallic materials. Under normal circumstances, alternating magnetic fields can induce eddy currents inside metal materials to achieve heating. However, since non-metallic raw materials themselves do not have ferromagnetism, if alternating magnetic fields are directly applied, eddy currents cannot be effectively generated in non-metallic raw materials, and induced magnetic fields cannot be detected around them. Therefore, the induced magnetic field induction treatment of non-metallic materials by magnetic fields urgently needs to develop a special generating device to achieve it. In theory, by using a high magnetic field to instantly induce atomic and molecular orientation inside non-metallic raw materials, combined with a special device structure, the induced magnetic field of non-metallic samples can be obtained and detected by instruments. Furthermore, the Lenz-Lorentz force affects the electron cloud distribution, ion current and molecular current density of the molecular atoms in the non-metallic raw materials, and then the sample may have an induced magnetic field of a certain intensity, and the physical and chemical properties of the raw materials themselves will also change to a certain extent. For example, the diamagnetic substances and charged ions (Ca 2+ 、Na + , K + The sample's own induced magnetic field can accelerate the violent reciprocating motion of electrolyte ions or charged solutes inside the sample, and then a volumetric thermal effect will occur inside the non-metallic raw material, making the heat distribution more uniform and achieving sample processing. Summary of the invention

[0003] The main purpose of the present invention is to provide a non-metallic sample induced magnetic field generating device and application thereof, so as to overcome the deficiencies in the prior art.

[0004] At present, since the response of non-metallic raw materials to external magnetic fields is extremely weak, if the induced magnetic field of non-metallic raw materials is to be induced by external magnetic fields, and the induced magnetic field can be effectively detected by the Hall sensor or mutual inductor of the instrument, it is necessary to specially design and manufacture special structural devices. When the induced magnetic field carrier works under high power, the magnetic field energy is lost due to magnetic loss and iron loss effects inside the induced magnetic field carrier, and the instantaneous peak intensity of the magnetic field is insufficient, and thus it is impossible to effectively induce the non-metallic material to generate an induced magnetic field. Alternatively, the high magnetic field is not in the optimal frequency region of the magnetic conductor, and it is impossible to induce the non-metallic sample to generate an effective induced magnetic field, resulting in the insignificant effect of the induced magnetic field on the physical and chemical properties of the non-metallic sample.

[0005] The present invention arranges a specific structure to achieve efficient heat exchange inside and outside the induction magnetic field carrier, so that it has the most suitable external magnetic field strength and effective working frequency. At the same time, the cross-sectional area ratio of the sample tube and the induction magnetic field carrier is maintained within a certain range, which can ensure that the induction magnetic field carrier outputs effective power to the non-metallic sample in the sample tube, smoothly induces the induced magnetic field, and avoids the induction magnetic field carrier from being unable to achieve the induction of the induced magnetic field to the non-metallic sample due to the loss of magnetic energy due to excessive temperature rise, that is, no induced magnetic field is generated around the non-metallic sample, and the Hall sensor or current transformer of the instrument cannot be effectively detected.

[0006] In order to achieve the above-mentioned invention object, the technical solution adopted by the present invention includes: The first aspect of an embodiment of the present invention provides a device for generating an induced magnetic field for a non-metallic sample, comprising: a sample tube, an induction magnetic field carrier and an induction magnetic field carrier cooling system, at least a portion of the sample tube is wound around the outside of the induction magnetic field carrier, the sample tube is used to accommodate the non-metallic sample and can allow the non-metallic sample in a fluid state to flow continuously, the induction magnetic field carrier is used to generate a high induction magnetic field, the high induction magnetic field can induce the non-metallic sample in the sample tube to generate an induced magnetic field, the induced magnetic field can change the physical and chemical properties of the non-metallic sample, the induction magnetic field carrier cooling system is thermally coordinated with the induction magnetic field carrier, and is at least used to keep the temperature of the induction magnetic field carrier at the working temperature.

[0007] Furthermore, the magnetic induction intensity of the high induction magnetic field is 0.2 T to 1.5 T, and / or the magnetic field frequency of the high induction magnetic field is 50 Hz to 200 kHz.

[0008] Furthermore, the cross-sectional area of ​​the magnetic path of the induction magnetic field carrier is 3 cm 2 ~500 cm 2 .

[0009] Furthermore, the ratio of the radial cross-sectional area of ​​the sample placement tube to the magnetic path cross-sectional area of ​​the induced magnetic field carrier is 0.0002-4.2.

[0010] Furthermore, the induction magnetic field carrier includes m annular magnetic conductors and an excitation carrier, the excitation carrier is wound outside the m magnetic conductors, and the excitation carrier is electrically connected to a power supply, and m≥1.

[0011] Furthermore, when m≥2, the m magnetic conductors included in the induced magnetic field carrier are arranged in parallel.

[0012] Furthermore, the m magnetic conductors included in the induced magnetic field carrier are arranged in sequence along its own axial direction.

[0013] Furthermore, the material of the magnetic conductor includes at least one of iron-based amorphous, iron-nickel-based amorphous, cobalt-based amorphous, iron-based nanocrystal, and Permalloy crystal, but is not limited thereto.

[0014] Furthermore, the induced magnetic field carrier cooling system includes at least one of a semiconductor refrigeration plate, a metal plate, a constant temperature bath plate, and a constant temperature bath chamber. The constant temperature bath plate and the constant temperature bath chamber are also connected to a refrigeration compressor, a heat exchanger or a circulating air cooler. A constant temperature bath medium is also formed in the constant temperature bath plate or the constant temperature bath chamber.

[0015] Furthermore, the magnetic conductor is attached to the semiconductor refrigeration plate, the metal plate or the constant temperature bath plate, or the magnetic conductor is arranged in the constant temperature bath chamber.

[0016] Furthermore, when m≥2, the m magnetic conductors are alternately arranged with the semiconductor refrigeration plate, the metal plate or the constant temperature bath plate.

[0017] Furthermore, the working temperature is 30°C to 160°C.

[0018] Furthermore, the whole or part of the sample placement tube is electrically insulated.

[0019] Furthermore, the electrical conductivity of the non-metallic sample is 0.01 S / m ~20.0 S / m.

[0020] A second aspect of an embodiment of the present invention provides a method for changing the physical and chemical properties of a non-metallic sample, comprising: Provide the non-metallic sample induced magnetic field generating device, And, placing a non-metallic sample in the sample tube, so that the induction magnetic field carrier generates a high induction magnetic field, and the temperature of the induction magnetic field carrier is maintained at the working temperature by the induction magnetic field carrier cooling system, and the high induction magnetic field induces an induced magnetic field in the non-metallic sample in the sample tube, and the magnetic field strength of the induced magnetic field is 5 μT~5mT.

[0021] Furthermore, the magnetic induction intensity of the high induction magnetic field is 0.2 T to 1.5 T, and / or the magnetic field frequency of the high induction magnetic field is 50 Hz to 200 kHz.

[0022] Furthermore, the operating temperature of the induction magnetic field carrier is 30°C to 160°C.

[0023] Furthermore, the electrical conductivity of the non-metallic sample is 0.01 S / m ~20.0 S / m.

[0024] Furthermore, the non-metallic sample in the sample tube remains in a static or flowing state.

[0025] Compared with the prior art, the advantages of the present invention include: a non-metallic sample induced magnetic field generating device provided by an embodiment of the present invention, which achieves efficient heat exchange inside and outside the induced magnetic field carrier by setting a specific structure, so that it has an optimal induced magnetic field strength and an effective working frequency. At the same time, the cross-sectional area ratio of the sample tube and the induced magnetic field carrier is maintained within a certain range, so that the induced magnetic field carrier can achieve effective power output relative to the non-metallic sample in the sample tube, and successfully induce a detectable induced magnetic field around the non-metallic sample, thereby avoiding the induction of the induced magnetic field to the non-metallic sample due to magnetic energy loss caused by excessive temperature rise. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a structural schematic diagram of a non-metallic sample induced magnetic field generating device provided in Example 1 of the present invention; Figure 2 It is a schematic top view of the structure of a non-metallic sample induced magnetic field generating device provided in Example 1 of the present invention; Figure 3 It is a cross-sectional schematic diagram of an induced magnetic field carrier and a carrier cooling system in a non-metallic sample induced magnetic field generating device provided in Example 2 of the present invention; Figure 4 It is a cross-sectional schematic diagram of an induced magnetic field carrier and a carrier cooling system in a non-metallic sample induced magnetic field generating device provided in Example 3 of the present invention; Figure 5A , Figure 5B They are electron microscope images of citrus peels after treatment in Example 3 and Comparative Example 1; Figure 6 It is a cross-sectional schematic diagram of an induced magnetic field carrier and a carrier cooling system in a non-metallic sample induced magnetic field generating device provided in Example 4 of the present invention; Fig. 7A , Figure 7B The electron microscope images of corn starch after being treated in Example 4 and Comparative Example 2 are respectively; Figure 8It is a cross-sectional schematic diagram of an induced magnetic field carrier and a carrier cooling system in a non-metallic sample induced magnetic field generating device provided in Example 5 of the present invention; Fig. 9A is the appearance of fresh bayberry juice before being treated in Example 5 of the present invention and Comparative Example 3; Fig. 9B , Fig. 9C The following are the appearance pictures of bayberry juice after being processed in Example 5 of the present invention and Comparative Example 3 respectively. DETAILED DESCRIPTION

[0027] In view of the deficiencies in the prior art, the inventor of this case has proposed the technical solution of the present invention after long-term research and extensive practice. The following will further explain the technical solution, its implementation process and principle, etc. in conjunction with the accompanying drawings and specific implementation cases.

[0028] Example 1 See also Figure 1 and Figure 2 , a non-metallic sample induced magnetic field generating device, comprising a sample placement tube 101, an induced magnetic field carrier, an induced magnetic field carrier cooling system, and a control system 112; The induction magnetic field carrier includes m annular magnetizers 102, an excitation carrier 104 and a power supply 108. The sample tube 101 and the excitation carrier 104 are wound on the outside of the m magnetizers 102. The excitation carrier 104 is electrically connected to the power supply 108. The power supply 108 and the induction magnetic field carrier cooling system are electrically connected to the control system 112. The control system 112 regulates and monitors the working parameters of the power supply 108 and the induction magnetic field carrier cooling system so that the induction magnetic field carrier generates a high induction magnetic field. The high induction magnetic field can induce an induced magnetic field in the non-metallic liquid of the sample tube 101. The induction magnetic field carrier cooling system 103 is used for temperature control of the induction magnetic field carrier (mainly the magnetizer).

[0029] In this embodiment, the sample tube 101 is a single-layer or multi-layer spiral coil that is fully or partially electrically insulated. The sample tube 101 is partially or fully wound around the magnetic conductor 102. The sample tube 101 has a feed port 105 and a discharge port 106. The feed port and the discharge port of the multi-layer spiral coil are connected in parallel using a conduit 113 with a T-type connector. The sample tube 101 is also connected to a material pump 107, which is used to pump the non-metallic sample into the sample tube 101. In addition, the local pipeline of the sample tube 101 is connected to a current transformer 111, and the current transformer 111 is connected to an oscilloscope 110 to measure the induced magnetic field generated by the non-metallic liquid in the sample tube 101 induced by the high induction magnetic field. Exemplarily, the sample tube 101 is a two-layer spiral coil, which is wound in parallel on the outside of the magnetic conductor 102. The material of the spiral coil can be PFA, FEP, glass, quartz, silicone or epoxy resin, etc., which are corrosion-resistant and high-temperature resistant materials. The material pump 107 can be a peristaltic pump, a horizontal flow pump, a centrifugal pump, a diaphragm pump, a gear pump, a pressure pump or a screw pump, etc.

[0030] In this embodiment, the excitation carrier 104 is a plurality of metal wires wound in parallel on the magnetic conductor 102. Specifically, the metal wires can be copper wires, silver wires, aluminum wires, etc. In addition, the excitation carrier 104 is electrically connected to a power supply 108 with an output voltage frequency of 50 Hz to 200 kHz to convert electrical energy into magnetic energy of an induced magnetic field carrier, thereby generating a high induction magnetic field.

[0031] In this embodiment, m of the magnetizers 102 can be combined to form a hollow frame structure with a symmetrical shape, and the materials of the magnetizers 102 include: iron-based amorphous, iron-nickel-based amorphous, cobalt-based amorphous, iron-based nanocrystalline, cold-rolled silicon steel, permalloy, ferrite, and ferrite stainless steel. Specifically, the magnetic induction intensity of the induced magnetic field carrier composed of m magnetizers 102 with different cross-sectional areas is 0.2 T ~ 1.5 T. By adjusting the number and cross-sectional area of ​​the magnetizers 102, the magnetic path cross-sectional area of ​​the m magnetizers 102 as a whole is controlled to be 3~500 cm 2 To achieve the adjustment of the induced magnetic field power. For example, when the cross-sectional area of ​​the magnetic path of the m magnetizers 102 as a whole increases or decreases, the maximum output power of the induced magnetic field carrier increases or decreases, thereby generating a higher or lower induced magnetic field in the sample tube. However, excessively increasing the number of magnetizers 102 may lead to a decrease in the utilization rate of magnetic energy, and the gradient effect of the induced magnetic field of each component of the non-metallic sample in the sample tube is aggravated and then offset each other, which has almost no effect on the molecular orientation and cell membrane permeability of the non-metallic sample in the sample tube, or even produces a negative effect.

[0032] In this embodiment, the induction magnetic field carrier cooling system specifically includes a semiconductor refrigeration plate, a metal plate, a constant temperature bath plate or a constant temperature bath chamber; wherein the constant temperature bath plate and the constant temperature bath chamber are connected to a refrigeration compressor, a heat exchanger or a circulating air cooler, and heat is exchanged through a water bath, an oil bath or other fluid medium. Exemplarily, the m magnetizers 102 are spaced and fitted with the constant temperature bath plate, that is, at least one constant temperature bath plate is arranged between adjacent magnetizers 102, and the constant temperature bath plate fits the surface of adjacent magnetizers 102, or at least one magnetizer 102 is fixed and placed inside a constant temperature bath chamber 103 (5), the inlet 103 (2) and outlet 103 (1) of the constant temperature bath plate or the constant temperature bath chamber are connected to a refrigeration compressor 103 (3) and a heat exchanger 103 (4), the temperature in the constant temperature bath plate or the constant temperature bath chamber is detected by a temperature sensor 109, and the temperature of the induction magnetic field carrier (mainly the magnetizer, the same below) is regulated by a control system 112 to be between 30 ℃ and 160 ℃. ℃, and the gaps formed between the m magnetizers 102 can be used for the flow of the constant temperature bath, and the sample tube 101 can be partially or completely wound around the outside of the combination of the constant temperature bath plate and the magnetizer, or partially or completely wound around the outside of the constant temperature bath cavity, or partially or completely wound around the inside of the constant temperature bath cavity and outside the magnetizer 102. The constant temperature bath medium environment is arranged around the induced magnetic field carrier, which can eliminate the leakage inductance loss to a certain extent, promote the formation of the induced magnetic field of the non-metallic sample, and produce a heat dissipation effect incidentally.

[0033] In this embodiment, the control system 112 can be a PLC control system, etc. The numerical control program used by the control system 112 can be obtained commercially, and the circuit structure in the present invention is implemented using methods or technologies known to technicians in this field, and no special limitations are made here.

[0034] In this embodiment, when a non-metallic sample induced magnetic field generating device is in operation, a non-metallic liquid with a conductivity of 0.01 S / m to 20.0 S / m is pumped from a feed port 105 into a sample tube 101 by a material pump 107, and the non-metallic liquid fills the sample tube 101. The flow rate of the non-metallic liquid in the sample tube 101 is uniform, and the time required to pass through the spiral coil of the same length is consistent. The magnetic induction intensity of the high induction magnetic field generated by the induced magnetic field carrier is 0.2 T to 1.5 T, and the magnetic field frequency is 50 Hz to 200 kHz. The induced magnetic field carrier cooling system maintains the temperature of the induced magnetic field carrier (mainly a magnetic conductor, the same below) at 30°C to 160°C, and the induced magnetic field intensity in the non-metallic liquid in the sample tube 101 is B As shown in formula (1); Formula (1) in, is the vacuum permeability, which is 4π×10 -7, I is the induced current inside the non-metallic liquid (measured by the current transformer 111 and the oscilloscope 110), r It is the shortest distance from the axial center of the sample tube to the center of the annular magnetic circuit of the current transformer.

[0035] Example 2 Referring to Example 1, a non-metallic sample induced magnetic field generating device provided in this embodiment is basically the same as Example 1, and the same parts of the two will not be repeated here.

[0036] In this embodiment, the excitation carrier is a high-frequency multi-strand Litz wire, which is composed of 300 copper wires with a diameter of 0.05 mm. The multiple strands are wound in parallel on the magnetizer and are electrically connected to the power supply. The power supply applies an effective voltage of 600V with a frequency of 80 kHz to the excitation carrier; the magnetic material of the magnetizer 201 of the induction magnetic field carrier is iron-based nanocrystal, and the magnetic cross-sections of the three magnetizers 201 are as follows: Figure 3 As shown, the three magnetizers 201 are combined to ensure that the working magnetic induction intensity of the three magnetizers 201 as a whole is 0.7 T. The gap formed between the three magnetizers 201 can be a constant temperature bath flow. The magnetic path cross-sectional areas of the three magnetizers 201 are 8 cm 2 , 11 cm 2 and 8 cm 2 The magnetic path cross-sectional area of ​​the three magnetizers 201 is 27 cm 2 ; The sample tubes are two single-layer PFA spiral coils 202 with an inner diameter of 0.8 cm and a radial cross-sectional area of ​​0.50 cm. 2 The ratio of the radial cross-sectional area of ​​the sample tube to the overall magnetic path cross-sectional area of ​​the three magnetizers of the induction magnetic field carrier is 0.019. The two spiral coils are all wound parallel to the outside of the magnetizer 201. The flowing non-metallic liquid is pumped into the sample tube from the feed port through a peristaltic pump until the non-metallic liquid fills the entire sample tube and finally flows out from the discharge port. The feed port and discharge port of the two spiral coils are respectively connected by a tube with a T-type joint with a cross-sectional area of ​​0.50 cm 2 The PFA tubes are connected in parallel so that the sample can flow through the spiral coils on both sides at the same time. The flow rate of the liquid in the two parallel spiral coils is the same, and the time required to pass through the spiral coils of the same length remains consistent.

[0037] In this embodiment, the induction magnetic field carrier cooling system includes a constant temperature bath chamber 203, a refrigeration compressor and a heat exchanger; three magnetic conductors and a sample tube are fixed and arranged in the constant temperature bath chamber, the inlet and outlet of the constant temperature bath chamber are connected to the refrigeration compressor and the heat exchanger, the constant temperature bath temperature is detected by a temperature sensor, and is regulated by the control system to maintain the working temperature of the induction magnetic field carrier at 80±5°C; the working temperature of the induction magnetic field carrier is measured by a temperature sensor, exemplarily, a thermocouple, a PT100 thermal resistor and an infrared thermal imaging system, and the power supply, the excitation carrier, and the induction magnetic field carrier cooling system are respectively connected to the PLC control system, and the power supply parameters, the magnetic field parameters and the temperature parameters are adjusted and monitored by the PLC control system.

[0038] Example 3 A method for extracting citrus peel polysaccharides. The device for extracting polysaccharides in this embodiment is the induced magnetic field generating device in Example 1.

[0039] The excitation carrier used in this embodiment is a high-frequency multi-strand Litz wire, which is composed of 200 copper wires with a diameter of 0.1 mm. The multi-strand high-frequency multi-strand Litz wires are wound in parallel outside the combination of the constant temperature bath plate 303 and the magnetic conductor 301, and are electrically connected to the power supply. The power supply applies a 50 kHz, 500 V voltage to the excitation carrier; the magnetic conductor of the induction magnetic field carrier is made of iron-based amorphous, and the magnetic radial cross section is as follows: Figure 4 As shown, the working magnetic induction intensity of a magnetizer 301 is 0.3 T, and the cross-sectional area of ​​the magnetic path of the magnetizer is 24 cm 2 The sample tubes are two single-layer PFA spiral coils 302, the inner diameter of the spiral coils 302 is 0.6 cm, and the cross-sectional area is 0.28 cm 2 The ratio of the radial cross-sectional area of ​​the sample tube to the magnetic path cross-sectional area of ​​the magnetic conductor of the induction magnetic field carrier is 0.012. The sample tubes are all wound parallel to the outside of the combination of the constant temperature bath plate 303 and the magnetic conductor 301, and are respectively provided with a feed port and a discharge port. The feed port and the discharge port of the two spiral coils are respectively connected by a tube with a T-joint and the cross-sectional area is 0.28 cm 2 The PFA tubes are connected in parallel so that the feed liquid can flow through the two spiral coils at the same time, and the flow rate of the feed liquid in the tubes is the same, and the time required to pass through the spiral coils of the same length remains consistent.

[0040] The induction magnetic field carrier cooling system used in this embodiment includes two constant temperature bath plates 302, a refrigeration compressor and a heat exchanger; the two constant temperature bath plates are bonded to the surface of the magnetic conductor and connected to the refrigeration compressor and the heat exchanger, and the constant temperature bath temperature is detected by a thermocouple system and regulated by the control system to maintain the working temperature of the induction magnetic field carrier at 75±5°C; the working temperature of the induction magnetic field carrier and the reaction temperature of the slurry are detected by an infrared thermal imaging system, and the power supply, excitation carrier, and induction magnetic field carrier cooling system are respectively connected to the PLC control system, and the power supply parameters, magnetic field parameters and temperature parameters are adjusted and monitored by the PLC control system.

[0041] A method for extracting citrus peel polysaccharides, specifically comprising: (1) Pretreatment of citrus peel suspension: Wash and cut citrus peel into pieces, dry at 60 °C until constant weight, and then grind. Add 4 wt% dilute sulfuric acid solution to the citrus peel powder at a ratio of 1:20 (w / w) and stir for 5 min to mix thoroughly to obtain a citrus peel suspension. The conductivity of the suspension is 1.2 S / m.

[0042] (2) Induced magnetic field acid hydrolysis: The suspension prepared in step (1) was pumped into the induced magnetic field generating device by a peristaltic pump. The current in the sample tube was measured by a current transformer connected to an oscilloscope to be 4.5 A, and the magnetic field strength of the induced magnetic field in the sample tube was 50 mT. When the flow rate of the citrus peel suspension was 10 L / h, the initial temperature of the citrus peel suspension was 25 °C as tested by the infrared imaging system. After continuously passing through the induced magnetic field generating device, the temperature of the citrus peel suspension flowing out was stabilized at 80 ± 1.5 °C, and then the sample tube was continuously circulated for 30 min.

[0043] (3) Post-treatment: The mixed liquid after the treatment in step (2) is subjected to vacuum filtration and rotary evaporation at 45°C until the liquid is concentrated to 25% of the original volume, then the rotary evaporation is stopped.

[0044] (4) Protein removal: The treated solution in step (3) was mixed with a chloroform-n-butanol solution at a volume ratio of 5:1, and the mixture was shaken for 30 min and centrifuged at 5000 r / min for 1 min to remove protein from the solution.

[0045] (5) Washing: After the sample has been treated in step (4), add 4 times the volume of ethanol and filter, and repeat 3 times.

[0046] (6) Drying: Dehydrate at room temperature under a vacuum of 12 Pa for 48 h.

[0047] (7) Grinding: The dried sample was pulverized with a grinder and sieved to obtain polysaccharide with a yield of 72.59%.

[0048] Comparative Example 1 A method for extracting citrus peel polysaccharides, the method for extracting citrus peel polysaccharides in comparative example 1 is substantially the same as that in example 3, except that the induced magnetic field generating device is not used for treatment. That is, in step (2), the mixed liquid prepared in step (1) is directly heated at 80±1.5°C for 30 min for acid hydrolysis.

[0049] Experimental results: The final yield of polysaccharides extracted from citrus peel was 25.67%.

[0050] By comparison, it was found that under the same treatment time, Example 3 can effectively improve the extraction of polysaccharide components in citrus peel, induce the sample to have an induced magnetic field and take effect. At the same time, H + 、SO4 2- The reciprocating motion of the isoelectric ions in the free path is intensified. As shown in FIG5 , the citrus peel ( Figure 5A ) structure is looser, forming more small fragments, promoting the decomposition of citrus peel tissue fibers, and the induced magnetic field environment promotes the opening of cell membrane pores, the precipitation of intracellular substances, and the increase of polysaccharide production, while in Comparative Example 1, the citrus peel ( Figure 5B ) is relatively dense, polysaccharides are not easy to precipitate, and the yield is low.

[0051] Example 4 A method for assisting the preparation of hydroxypropyl corn starch. In this embodiment, the device for assisting the modification of modified starch is the induced magnetic field generating device in Example 1.

[0052] The excitation carrier used in this embodiment is a high-frequency multi-strand Litz wire, which is composed of 300 copper wires with a diameter of 0.05 mm. The multiple high-frequency multi-strand Litz wires are wound in parallel on the outside of the constant temperature bath chamber 403 covering the magnetic conductor 401. The excitation carrier is electrically connected to the power supply, and a voltage of 80 kHz and 800 V is applied to the excitation carrier through the power supply. The material of the magnetic conductor of the induction magnetic field carrier is iron-based nanocrystal, and the radial cross section of the magnetic conductor is as follows: Figure 6 As shown, the working magnetic induction intensity of the three magnetizers 401 is 1.0 T, and the magnetic cross-sectional areas of the three magnetizers are 25, 100 and 25 cm respectively. 2 The sum of the cross-sectional areas of the three magnets along the magnetic path is 150 cm 2 The sample tube is two double-layer FEP spiral coils 402, the inner diameter of the spiral coil 402 is 1.3 cm, and the cross-sectional area of ​​the spiral coil 402 is 1.33 cm 2The ratio of the radial cross-sectional area of ​​the sample tube to the magnetic path cross-sectional area of ​​the magnetic conductor of the induced magnetic field carrier is 0.009. The sample tubes are all wound parallel to the outside of the constant temperature bath chamber 403 covering the magnetic conductor 401. The feed inlet and the discharge outlet of the two spiral coils are respectively connected by a tube with a T-joint with a cross-sectional area of ​​1.33 cm 2 The FEP tubes are connected in parallel so that the liquid can flow through the spiral coils on both sides at the same time, and the flow rate of the liquid in the tube is the same, and the time required to pass through the spiral coils of the same length remains consistent.

[0053] The induction magnetic field carrier cooling system used in this embodiment includes a constant temperature bath chamber, a refrigeration compressor and a heat exchanger; after the three magnetic conductors 401 are fixed, they are placed in a constant temperature bath chamber with a matching appearance and structural dimensions, the inlet and outlet of the constant temperature bath chamber are connected to the refrigeration compressor and the heat exchanger, the constant temperature bath temperature is detected by a PT100 thermal resistor, and is regulated by the control system to maintain the working temperature of the induction magnetic field carrier at 45 ± 5 ° C; the infrared thermal imaging system detects the reaction temperature of the liquid in the sample tube, and the power supply, excitation carrier, and induction magnetic field carrier cooling system are respectively connected to the PLC control system, and the power supply parameters, magnetic field parameters and temperature parameters are adjusted and monitored by the PLC control system.

[0054] A method for assisting the preparation of hydroxypropyl corn starch, specifically comprising: (1) Pretreatment of hydroxypropyl corn starch emulsion: corn starch emulsion was prepared by mixing commercial corn starch and 20 wt% sodium sulfate solution in a mass ratio of 2:3. 1 wt% sodium hydroxide was added to adjust the pH of the corn starch emulsion to 10.5, and 20 wt% propylene oxide was added and stirred for 5 min to fully mix the mixture to obtain a mixed liquid with an electrical conductivity of 0.8 S / m.

[0055] (2) Induced magnetic field treatment: The mixed liquid prepared in step (1) was pumped into the induced magnetic field generating device by a centrifugal pump. The current transformer connected to the oscilloscope measured the current in the sample tube to be 268.75 A, and the magnetic field strength of the induced magnetic field in the sample tube was 2.5 mT. When the flow rate of the mixed solution was 30 L / h, the initial temperature of the mixed solution was 25 °C as tested by the infrared imaging system. After continuously passing through the induced magnetic field generating device, the temperature of the mixed solution flowing out was stabilized at 50±2.5 °C, and then the mixed solution was continuously circulated in the sample tube for 20 min.

[0056] (3) Neutralization, washing, and centrifugation: 1 wt % sulfuric acid was added to adjust the pH of the mixed solution after the treatment in step (2) to 6.5 to terminate the reaction, and the mixture was centrifuged at 2500 r / min for 10 min. The solids were separated after discarding the supernatant, and the mixture was washed with deionized water for two more times. After centrifugation, the supernatant was discarded.

[0057] (4) Drying: Spread the centrifuged sample flat on an evaporating dish and place it in a hot air drying oven for drying at 50 °C for 24 h.

[0058] (5) Crushing: The dried sample is crushed with a crusher and the powder with a fineness of about 100 mesh is sieved out.

[0059] (6) Detection: The hydroxypropyl content in the modified starch was determined according to GB / T 40998-2021, and the degree of substitution (i.e., hydroxypropyl / anhydroglucose) was calculated according to the following formula: DS = 162W / ((100-W) × 58), where W is the mass fraction of hydroxypropyl (%). The mass fraction of hydroxypropyl in the product of Example 4 was 32.51%, and the degree of substitution was 1.35.

[0060] Comparative Example 2 A method for assisting the preparation of hydroxypropyl corn starch. The modified starch auxiliary modification method in this comparative example is substantially the same as that in Example 4, except that the induced magnetic field generating device used in this comparative example includes a magnetizer, and the working magnetic induction intensity is 0.05 T, and the magnetic path cross-sectional area of ​​the magnetizer is 5 cm 2 The inner diameter of the sample tube is 5.4 cm and the cross-sectional area is 22.89 cm 2 , the ratio of the cross-sectional area of ​​the sample tube and the magnetic conductor is 4.58. In step (2), the mixed liquid is pumped into the induced magnetic field generating device, and the current transformer connected to the oscilloscope measures the current in the sample tube to be 0.21 A, and the magnetic field strength of the induced magnetic field induced in the sample tube is 1 mT. When the flow rate of the mixed solution is 30 L / h, the initial temperature of the mixed solution is 25 °C as tested by the infrared imaging system. After continuously passing through the induced magnetic field generating device, the temperature of the outflowing mixed solution can only be stabilized at 26±1.5 °C, and then it is continuously circulated in the sample tube for 20 min for auxiliary modification.

[0061] Experimental results: The mass fraction of hydroxypropyl in the final product of Comparative Example 2 was 3.38%, and the degree of substitution was 0.10.

[0062] Under the action of a suitable induced magnetic field, the starch particles in Example 4 ( Fig. 7A) The porous structure is formed on the surface, which is conducive to the hydroxypropylation of corn starch. The starch chain structure is opened, which makes it easier for the hydroxypropyl functional group to combine with the starch molecules. The working magnetic induction intensity of the induced magnetic field generating device of Comparative Example 2 is only 0.05 T, which is relatively small. Moreover, the total magnetic path cross-sectional area ratio of the sample tube and the magnetic conductor of the induced magnetic field carrier is 4.58, and the sample tube is relatively large. The induced magnetic field detected in the hydroxypropyl corn starch emulsion is extremely weak, and there is no significant thermal effect on the liquid in the sample tube. Moreover, the antimagnetic substances such as hydroxypropyl and starch macromolecules in the hydroxypropyl corn starch emulsion are negligibly affected by the induced magnetic field, and the corn starch structure is intact ( Figure 7B ), the interaction force between the components is weak and the magnetic field energy utilization rate is low, so the hydroxypropyl content and degree of substitution are extremely small.

[0063] Example 5 A method for sterilizing bayberry juice. The device for sterilizing bayberry juice in this embodiment is the induced magnetic field generating device in Example 1.

[0064] The excitation carrier used in this embodiment is a high-frequency multi-strand Litz wire, which is composed of 800 copper wires with a diameter of 0.1 mm. The multi-strand high-frequency multi-strand Litz wires are wound in parallel on the outside of the induction magnetic field carrier formed by the constant temperature bath plate 503 and the magnetizer 501. The excitation carrier is electrically connected to the power supply, and a voltage of 40 kHz and 900 V is applied to the excitation carrier through the power supply; the material of the magnetizer 501 of the induction magnetic field carrier is iron-based nanocrystal, and the magnetic radial cross section of the magnetizer 501 is as follows: Figure 8 As shown, the total working magnetic induction intensity of the five magnetizers 501 is 1.3 T, and the cross-sectional areas of the magnetic paths of the five magnetizers are 7.5, 20, 40, 20, and 7.5 cm, respectively. 2 The sum of the cross-sectional areas of the five magnets along the magnetic path is 95 cm 2 The sample tube is two single-layer glass spiral coils 502, the inner diameter of the spiral coil 502 is 1.6 cm, and the cross-sectional area of ​​the spiral coil 502 is 2.01 cm 2 The ratio of the radial cross-sectional area of ​​the sample tube to the magnetic path cross-sectional area of ​​the magnetic conductor of the induced magnetic field carrier is 0.021. The sample tubes are all wound parallel to the outside of the combination of the constant temperature bath plate 503 and the magnetic conductor 501. The feed inlet and the discharge outlet of the two spiral coils are respectively connected by a tube with a T-joint with a cross-sectional area of ​​2.01 cm 2 The glass tubes are connected in parallel so that the slurry can flow through the spiral coils on both sides at the same time, and the flow rate of the slurry in the tubes is the same, and the time required to pass through the spiral coils of the same length remains consistent.

[0065] The induction magnetic field carrier cooling system used in this embodiment includes four constant temperature bath plates 503, a refrigeration compressor and a heat exchanger; five magnetic conductors are connected to the four constant temperature bath plates at intervals, the constant temperature bath plates are in contact with the surfaces of the magnetic conductors, and the constant temperature bath plates are connected to the refrigeration compressor and the heat exchanger. The temperature of the constant temperature bath is detected by a thermocouple system to control the working temperature of the induction magnetic field carrier to be maintained at 90±5°C; the working temperature of the induction magnetic field carrier and the reaction temperature of the liquid in the sample tube are detected by an infrared thermal imaging system, and the power supply, excitation carrier, and induction magnetic field carrier cooling system are respectively connected to the PLC control system, and the power supply parameters, magnetic field parameters, and temperature parameters are adjusted and monitored by the PLC control system.

[0066] A method for sterilizing bayberry juice, specifically comprising: (1) Pretreatment of bayberry juice raw materials: 30 L of fresh bayberry juice with a conductivity of 0.4 S / m was taken and filled into plastic culture bottles according to the specification of 5 L / bottle, sealed and stored, and coded A1~A6.

[0067] (2) Induced magnetic field treatment: The A3-A4 liquid prepared in step (1) was pumped into the induced magnetic field generating device by a horizontal flow pump. The current in the sample tube was measured by a current sensor connected to an oscilloscope to be 575 A, and the magnetic field strength of the induced magnetic field in the sample tube was 5 mT. When the solution flow rate was 40 L / h, the initial temperature of the solution was 25°C as tested by an infrared imaging system. After continuously passing through the induced magnetic field generating device, the temperature of the outflowing solution stabilized at 65±1.0°C, and the treatment was continued for 15 seconds before sampling.

[0068] (3) Conventional heat treatment: The A5-A6 solution prepared in step (1) was stirred and heated to 65±1.0°C, and then sampled after the treatment was continued for 15 seconds.

[0069] (4) Detection: Take sample A1 that has not been sterilized in step (1), sample A3 that has been treated with an induced magnetic field in step (2), and sample A5 that has been heat-treated in step (3), and perform microbial counts according to the coating method in GB4789.2-2022. Each group of samples is tested three times and the average value is taken. The sterilization rate (%) = (microbial count of the original sample - microbial count of the sample treated with an induced magnetic field) / microbial count of the original sample × 100. The anthocyanin content is determined by the pH differential method (Wang Fengjuan, Sun Feilong, Ye Wenwen, et al. Optimization of the conditions for determining anthocyanins in red chicory by pH differential method [J]. Packaging and Food Machinery, 2018, 36(5): 61-64.), and the anthocyanin retention rate (%) = anthocyanin content after accelerated shelf life test / anthocyanin content of the sample after raw material treatment × 100.

[0070] (4) Accelerated shelf life test: Samples A2 that were not sterilized, A4 that were treated with an induced magnetic field, and A6 that were treated with conventional heat treatment in step (1) were stored at 37°C for 7 days in accordance with the requirements for commercial sterility in GB 4789.26-2023. The total colony count was evaluated and the average value was taken after each group of samples was tested three times.

[0071] Experimental results: Before and after raw material processing

[0072] Accelerated Shelf Life Testing

[0073] The sterilization rates of bayberry juice after induced magnetic field treatment and traditional heat treatment were 99.20% and 33.27%, respectively, and the anthocyanin content decreased by 3.86% and 12.40%, respectively, compared with the unsterilized original sample. After storage at 37 ℃ for 7 days, the untreated A2 and heat-treated A6 showed obvious bulging and spoilage; the A4 after induced magnetic field sterilization did not bulge, and the total colony count did not exceed 2 logarithms, meeting the requirements of commercial sterility. The anthocyanin retention rate of the untreated sample before and after the accelerated shelf life test was 13.11%, while the anthocyanin retention rates of bayberry juice after induced magnetic field treatment and traditional heat treatment were 22.52% and 16.36%, respectively. The anthocyanin retention rate after induced magnetic field treatment was significantly improved, and compared with the single thermal effect, the non-thermal effect of induced magnetic field can promote the killing of microorganisms.

[0074] Comparative Example 3 A method for sterilizing bayberry juice. The method for sterilizing bayberry juice in this comparative example is roughly the same as that in Example 5, except that the induced magnetic field generating device used in this comparative example includes a magnetic conductor, and the working magnetic induction intensity is 1.8 T. In step (2), the slurry is pumped into the induced magnetic field generating device, and the current transformer connected to the oscilloscope measures the current in the sample tube to be 920 A, and the induced magnetic field induced in the sample tube is 8 mT. When the solution flow rate is 40 L / h, the initial temperature of the sample tested by the infrared imaging system is 25°C. After continuously passing through the induced magnetic field generating device, the temperature of the sample flowing out is stabilized at 75±2.0°C, and the sample is sampled after continuing to process for 15 s. At the same time, the temperature of the traditional heat treatment in step (3) is 75±2.0°C.

[0075] Experimental results: Before and after raw material processing

[0076] Accelerated Shelf Life Testing

[0077] After the bayberry juice was treated with induced magnetic field and traditional heat sterilization, the sterilization rates were 87.87% and 38.36%, respectively, and the anthocyanin content was reduced by 8.51% and 14.87% compared with that of the unsterilized ones. After storage at 37 ℃ for 7 days, the untreated B2 and the traditional heat-treated B6 had obvious can swelling, while the B4 after induced magnetic field sterilization did not have can swelling, and the total colony count did not exceed 2 logarithms, reaching commercial sterility. The anthocyanin retention rate of the untreated sample before and after the accelerated shelf life test was 12.72%, while the anthocyanin retention rates of the bayberry juice after induced magnetic field treatment and traditional heat treatment were 16.26% and 14.58%, respectively. Compared with the single traditional thermal effect, the non-thermal effect of the induced magnetic field has a certain promoting effect on the killing of microorganisms, but has no significant effect on the retention rate of anthocyanins.

[0078] Compared with the inactivation effect of the heat effect on microorganisms, fresh bayberry juice ( Fig. 9A ) Under the action of a suitable induced magnetic field, the electroporation of microorganisms is promoted, and the cell membrane ruptures and dies, thereby further enhancing the sterilization effect. Moreover, due to the low sterilization temperature, the bayberry juice ( Fig. 9B ) reduces the loss of heat-sensitive ingredients such as anthocyanins, keeps the color bright, prolongs the shelf life and ensures product safety, while improving the quality of bayberry juice. However, due to the increase in the intensity of the induced magnetic field, the sterilization temperature of the sample increases, and the bayberry juice treated in Example 3 ( Fig. 9C ) The heat-sensitive components such as anthocyanins in the bayberry juice are affected by the strong induced magnetic field, and some of them are hydrolyzed or oxidized, which weakens the color brightness of the bayberry juice.

[0079] It should be noted that the above embodiments are only exemplary descriptions of the present invention, and the various process conditions used therein are relatively typical examples, but after a large number of experiments and verifications by the inventors of this case, the other process conditions listed above are also applicable and can also achieve the technical effects claimed by the present invention. Of course, any large-scale equipment / equipment formed by connecting the induced magnetic field generating devices in series and / or in parallel is also within the scope of protection of the present invention.

[0080] It should be understood that the above embodiments are only for illustrating the technical concept and features of the present invention, and their purpose is to enable people familiar with the technology to understand the content of the present invention and implement it accordingly, and they cannot be used to limit the protection scope of the present invention. The above technical features of the present invention and the technical features specifically described in the following (embodiments) can be combined with each other to form a new or preferred technical solution. Due to space limitations, they will not be described one by one here.

Claims

1. A device for generating an induced magnetic field for a non-metallic sample, characterized in that: include: A sample tube, an induction magnetic field carrier and an induction magnetic field carrier cooling system, wherein at least part of the sample tube is wound around the outside of the induction magnetic field carrier, the sample tube is used to accommodate non-metallic samples and can allow non-metallic samples in a fluid state to flow continuously, the induction magnetic field carrier is used to generate a high induction magnetic field, the high induction magnetic field can induce the non-metallic sample in the sample tube to generate an induced magnetic field, and the induced magnetic field can change the physical and chemical properties of the non-metallic sample, the induction magnetic field carrier cooling system cooperates with the induction magnetic field carrier for thermal conductivity, and is at least used to keep the temperature of the induction magnetic field carrier at the working temperature.

2. The non-metallic sample induced magnetic field generating device according to claim 1, characterized in that: The magnetic induction intensity of the high induction magnetic field is 0.2 T to 1.5 T, and / or the magnetic field frequency of the high induction magnetic field is 50 Hz to 200 kHz.

3. The non-metallic sample induced magnetic field generating device according to claim 1, characterized in that: The cross-sectional area of ​​the magnetic path of the induction magnetic field carrier is 3 cm 2 ~500 cm 2 .

4. The non-metallic sample induced magnetic field generating device according to claim 1, characterized in that: The ratio of the radial cross-sectional area of ​​the sample placement tube to the magnetic path cross-sectional area of ​​the induction magnetic field carrier is 0.0002-4.

2.

5. The non-metallic sample induced magnetic field generating device according to claim 1, 2, 3 or 4, characterized in that: The induction magnetic field carrier includes m annular magnetic conductors and an excitation carrier, the excitation carrier is wound outside the m magnetic conductors, the excitation carrier is electrically connected to a power supply, and m≥1; Preferably, when m≥2, the m magnetic conductors included in the induction magnetic field carrier are arranged in parallel; Preferably, the m magnetic conductors included in the induction magnetic field carrier are arranged in sequence along its own axial direction.

6. The non-metallic sample induced magnetic field generating device according to claim 5, characterized in that: The material of the magnetic conductor includes at least one of iron-based amorphous, iron-nickel-based amorphous, cobalt-based amorphous, nanocrystalline, and permalloy.

7. The non-metallic sample induced magnetic field generating device according to claim 5, characterized in that: The induction magnetic field carrier cooling system includes at least one of a semiconductor refrigeration plate, a metal plate, a constant temperature bath plate, and a constant temperature bath cavity, wherein the constant temperature bath plate and the constant temperature bath cavity are also connected to a refrigeration compressor, a heat exchanger, or a circulating air cooler, and the constant temperature bath plate or the constant temperature bath cavity also contains a constant temperature bath medium; Preferably, the magnetic conductor is attached to the semiconductor refrigeration plate, the metal plate or the constant temperature bath plate, or the magnetic conductor is arranged in the constant temperature bath chamber; Preferably, when m≥2, the m magnetic conductors are alternately arranged with the semiconductor refrigeration plate, the metal plate or the constant temperature bath plate; And / or, the operating temperature is 30°C~160°C.

8. The non-metallic sample induced magnetic field generating device according to claim 1, characterized in that: The whole or part of the sample placement tube is electrically insulated; And / or, the electrical conductivity of the non-metallic sample is 0.01 S / m ~20.0 S / m.

9. A method for changing the physical and chemical properties of a non-metallic sample, characterized in that: include: Provided is a non-metallic sample induced magnetic field generating device as described in any one of claims 1 to 8, And, placing a non-metallic sample in the sample tube, so that the induction magnetic field carrier generates a high induction magnetic field, and the temperature of the induction magnetic field carrier is maintained at the working temperature by the induction magnetic field carrier cooling system, and the high induction magnetic field induces an induced magnetic field in the non-metallic sample in the sample tube, and the magnetic field strength of the induced magnetic field is 5 μT~5 mT.

10. The method for changing the physical and chemical properties of a non-metallic sample according to claim 9, characterized in that: The magnetic induction intensity of the high induction magnetic field is 0.2 T to 1.5 T, and / or the magnetic field frequency of the high induction magnetic field is 50 Hz to 200 kHz; And / or, the operating temperature of the induction magnetic field carrier is 30°C to 160°C; And / or, the electrical conductivity of the non-metallic sample is 0.01 S / m to 20.0 S / m; And / or, the non-metallic sample in the sample tube remains in a static or flowing state.

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