A heat treatment system and method based on a magnetic induction electric field

Abstract

The present invention discloses a heat treatment system and method based on a magnetic induction electric field. The heat treatment system includes components such as a magnetic core, a first tube body, a second tube body, a treatment chamber, a magnetic coupling tube, and an exciting coil; wherein a salt bridge inlet is provided at the lower part of the first tube body, and the lower parts of the first and second tube bodies are connected through the magnetic coupling tube, and the upper parts are connected through the treatment chamber, and material flow inlets are provided at the upper parts of the first and second tube bodies; the salt bridge inlet is used to inject a precursor solution of the salt bridge into the first tube body to form a salt bridge in the regions of the first and second tube bodies below the material flow inlets and in the magnetic coupling tube. The present invention can process liquid material media with a conductivity value of 10 μS / cm - 500 mS / cm, with a temperature of 10 - 100 °C and a treatment time of 1 s - 10 min, and can realize multi-field processing including liquid food sterilization, liquid biomass catalysis, and liquid polymer synthesis for liquid materials and other liquid materials.

Description

Technical Field

[0001] The present invention relates to a heat treatment device, and particularly to a heat treatment system and method based on a magnetic induction electric field, belonging to the light industry field. Background Art

[0002] As an important treatment method, heat treatment is not only used in food processing and preservation to improve food quality and extend the storage period of food, but also plays an important role in fields such as biomass catalysis and polymer materials. Currently, traditional heat treatment technologies in industry (such as hot air, water bath, steam heating) are usually in the form of heat conduction, with low heat transfer efficiency, uneven heating, long treatment time, and damage to heat-sensitive elements in the material.

[0003] In recent years, new heat treatment technologies have been developed, mainly aiming to improve production efficiency and reduce energy consumption while maintaining the natural characteristics of the material. These new heat treatment technologies are mainly radio frequency heating technology, microwave heating technology, ohmic heating technology, and high-voltage pulsed electric field heat treatment technology, etc. However, the effect of radio frequency heating on material heat treatment has not been fully studied and verified; microwave heating is faster, but it is prone to uneven heating in the edge area and loss of the natural characteristics of the material; ohmic heating and high-voltage pulsed electric field heat treatment technologies utilize the dielectric properties of the material itself. When an electric current passes through, electrical energy is converted into heat energy inside the material, causing the temperature of the material to rise, so that a rapid heating effect can be achieved and the heating effect is relatively uniform; but both involve direct contact between the electrode plate and the material, and during the heating process, it is easy to cause electrochemical reactions, resulting in scaling of the electrode plate and metal corrosion of the material, thereby changing the material quality and reducing the heat treatment efficiency.

[0004] Considering the challenges brought by globalization and the diverse needs of consumers for industrial application technologies, new technologies must be internationally competitive, ensure product production quality, meet consumer preferences, and comply with environmental protection standards and regulations. Therefore, in order to achieve green, efficient, and uniform heat treatment of liquid materials, it is necessary to study a new heat treatment system. As a physical field technology, the magnetic induction electric field avoids direct contact between the material and the electrode, realizes direct heat generation inside the material medium, and has potential huge application space and industrial value.

[0005] Previously, the inventors of this case proposed a kind of aging treatment device based on magnetic induction electric field, which mainly includes components such as an annular magnetic core, an exciting coil, a magnetic coupling tube, a storage chamber and a treatment chamber. Among them, the exciting coil is wound on the upper side of the annular magnetic core; the magnetic coupling tube is wound on the left and right sides of the annular magnetic core; the storage chamber includes a feeding storage chamber and a discharging storage chamber; the feeding storage chamber and the discharging storage chamber are connected through the treatment chamber, the treatment chamber crosses the central gap of the annular magnetic core, and both ends of the treatment chamber are respectively connected to the magnetic coupling tubes wound on the left and right sides of the annular magnetic core through a three-way connector, and the magnetic coupling tube is filled with a salt bridge composed of sodium chloride and food-grade agar, etc. Although this heat treatment device overcomes the defects of existing technologies such as radio frequency heating, microwave heating, ohmic heating and high-voltage pulsed electric field heat treatment, it still has deficiencies such as serious heating of the magnetic core, large total secondary load impedance, low effective heating voltage and small processing capacity, so it still needs to be improved. Summary of the Invention

[0006] The main object of the present invention is to provide a heat treatment system and method based on magnetic induction electric field to overcome the deficiencies in the prior art.

[0007] To achieve the foregoing invention object, the technical solutions adopted by the present invention include:

[0008] One aspect of the present invention provides a heat treatment system based on magnetic induction electric field, including an annular magnetic core, a first tube body, a second tube body and a treatment chamber; the first side and the second side of the annular magnetic core are wound with magnetic coupling tubes, the third side is wound with an exciting coil, the first side and the second side are arranged away from each other, the third side is arranged between the first side and the second side, and the exciting coil is electrically connected to a high-frequency exciting power supply;

[0009] Wherein, a salt bridge inlet and a first connection port are arranged at the lower part of the first tube body, and a first material flow inlet and a first treatment chamber inlet are arranged at the upper part;

[0010] A second connection port is arranged at the lower part of the second tube body, and a second material flow inlet and a second treatment chamber inlet are arranged at the upper part;

[0011] The first material flow inlet and the second material flow inlet are respectively connected to a material supply device, the first connection port and the second connection port are connected through the magnetic coupling tube, the first treatment chamber inlet and the second treatment chamber inlet are connected through the treatment chamber, and the treatment chamber is also connected to a material receiving device;

[0012] The salt bridge inlet is used to inject a precursor solution of the salt bridge into the first tube body, and the precursor solution of the salt bridge is used to fill the area below the first material flow inlet in the first tube body, the area below the second material flow inlet in the second tube body and the magnetic coupling tube and solidify to form a salt bridge.

[0013] In some embodiments, there are two magnetic coupling tubes, which are respectively wound around the left and right sides of the toroidal magnetic core, and the exciting coil is wound around the upper side of the toroidal magnetic core.

[0014] In some embodiments, the first tube body and the second tube body are respectively arranged in front of and behind the toroidal magnetic core.

[0015] In some embodiments, two first connection ports are arranged at the lower part of the first tube body.

[0016] In some embodiments, two second connection ports are provided at the lower part of the second tube body.

[0017] In some embodiments, the salt bridge inlet is arranged at the bottom end of the first tube body.

[0018] In some embodiments, the first material flow inlet and the second material flow inlet are respectively arranged at the top ends of the first tube body and the second tube body, the first processing chamber inlet is arranged on one side of the upper part of the first tube body and is higher than the top surface of the salt bridge therein, and the second processing chamber inlet is arranged on one side of the upper part of the second tube body and is higher than the top surface of the salt bridge therein.

[0019] In some embodiments, the salt bridge comprises sodium chloride with a concentration of 2 wt% - 40 wt% and food-grade agar with a concentration of 1 wt% - 5 wt%.

[0020] In some embodiments, the first tube body and the second tube body are made of glass tubes.

[0021] In some embodiments, the ratio of the inner diameter of the processing chamber to that of the first tube body or the second tube body is 1:50 - 1:1.

[0022] In some embodiments, the length of the processing chamber is 10 - 100 cm.

[0023] In some embodiments, the magnetic induction current density in the processing chamber is 0.2 - 1 A / cm 2 , and the magnetic induction electric field strength is 100 - 1000 V / cm.

[0024] In some embodiments, the sum of the number of turns of all magnetic coupling tubes is 16 - 50 turns.

[0025] In some embodiments, the number of turns of the exciting coil is 1 - 6 turns.

[0026] In some embodiments, the processing chamber is made of an electrically insulating material.

[0027] In some embodiments, the effective magnetic path length of the toroidal magnetic core is 50 - 150 cm, and the cross-sectional area is 30 - 500 cm 2 .

[0028] In some embodiments, the toroidal core is formed of a magnetic conductive material, and the magnetic conductive material has a saturation magnetic induction intensity of 0.5 - 2.03 T, a coercive force of 0.4 - 40 A / m, an initial magnetic permeability of 1500 - 100000, a maximum magnetic permeability of 6000 - 1000000, and a resistivity of 30 - 5×10 7 μΩ / cm, and a Curie temperature of 220 - 750 °C.

[0029] In some embodiments, the heat treatment system further includes a water-cooling plate connected to the toroidal core. The water-cooling plate is provided with a cooling medium channel, and the cooling medium channel is connected to a water-cooling circulation pump and a water-cooling radiator through a water-cooling liquid inlet and a water-cooling liquid outlet provided on the water-cooling plate to form a circulating water-cooling system.

[0030] Further, there are two water-cooling plates which are symmetrically arranged in front of and behind the toroidal core. At the same time, the two water-cooling plates are arranged in series in the circulating water-cooling system.

[0031] In some embodiments, the material supply device includes more than one sample injection bottle, and the sample injection bottles are respectively communicated with the first material flow inlet and the second material flow inlet through peristaltic pumps.

[0032] In some embodiments, the material receiving device includes a sample receiving bottle.

[0033] In some embodiments, the material supply device and the material receiving device share a material storage container.

[0034] Another aspect of the present invention provides a heat treatment method based on a magnetic induction electric field, which includes:

[0035] Providing the heat treatment system based on a magnetic induction electric field as described above;

[0036] Injecting a precursor solution of the salt bridge from the salt bridge inlet into the first tube body, and filling the areas in the first tube body below the first material flow inlet, the areas in the second tube body below the second material flow inlet, and the magnetic coupling tube with the precursor solution of the salt bridge and solidifying to form a salt bridge;

[0037] Applying an excitation voltage to the excitation coil with a high-frequency excitation power supply;

[0038] Making the materials provided by the material supply device enter the first tube body and the second tube body from the first material flow inlet and the second material flow inlet at a set flow rate, then flowing to the processing chamber, and then being output from the processing chamber and entering the material receiving device,

[0039] Alternatively, the material provided by the material supply device enters the first pipe body and the second pipe body from the first material flow inlet and the second material flow inlet at a set flow rate, then flows to the processing chamber, and after that, is output from the processing chamber and enters the material supply device again.

[0040] In some embodiments, the exciting voltage is 220V - 1800V, the waveform is a double-peak pulse, the frequency is 20 - 80kHz, and the duty cycle is 20% - 100%.

[0041] In some embodiments, the set flow rate is 5mL / min - 300mL / min.

[0042] In some embodiments, the material includes a liquid material with a conductivity of 10us / cm - 500ms / em.

[0043] Compared with the prior art, the present invention has at least the following beneficial effects:

[0044] (1) A heat treatment system provided can generate an alternating induced magnetic field in the toroidal magnetic core by applying a high-frequency voltage to the exciting coil. The alternating magnetic field in the toroidal magnetic core further generates an alternating induced electric field in the magnetic coupling tube. The induced electric field concentrates electrical energy in the glass tube, and the two glass tubes are equivalent to the positive and negative poles of a secondary power supply. Further, considering the diamagnetic characteristics of the liquid material medium and selecting a toroidal magnetic core of iron-based nanocrystalline soft magnetic material within the magnetic permeability range of 20 - 80kHz (the relative magnetic permeability of the liquid material is 0.999971 - 1.00026), it enables effective treatment of the liquid material when the exciting voltage is 220V - 1800V, the double-peak pulse waveform, and the frequency is 20 - 80kHz. Additionally, considering that the liquid material in the processing chamber has a certain conductivity (10us / cm - 500ms / em), electrical energy can be obtained in the induced electric field generated by the alternating magnetic field, and further the electrical energy is converted into heat energy.

[0045] (2) By adopting the structural form of double glass tubes (or tubes made of other materials) on the front and back sides of the toroidal core, the equivalent circuit of the liquid material in the whole loop is changed, which is beneficial to the instantaneous heating and efficient treatment of the liquid material; this is because the salt bridges under the magnetic coupling tube and the two glass tubes reduce the internal impedance of its secondary power supply, and further apply the induced electromotive force to the liquid material in the treatment chamber. Therefore, the induced electric field intensity and induced current density inside the liquid material are further increased, and the heat treatment efficiency is higher. Further, by adopting the double glass tube structural form, the flow path of the liquid material in the whole structure is changed, realizing the instantaneous treatment of the material and the efficient entry and exit of the treatment chamber; this is because the double-pump peristaltic pump is directly connected to the material inlet of the glass tube, driving the material to quickly pass through the treatment chamber, ensuring the uniform partial pressure of the liquid material, avoiding the blockage of the material in the pipeline, and the time of the liquid material in the treatment chamber is shorter and the flow path is smoother.

[0046] (3) The provided heat treatment system and method based on the magnetic induction electric field have a heat treatment efficiency that varies with the conductivity of the material, with a temperature rise of 10 - 100 °C and a treatment time of 1 s - 10 min, and can achieve heat treatment in multiple fields including liquid food sterilization, liquid biomass catalysis, and synthesis of liquid polymer substances for liquid materials such as liquid materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0048] Figure 1 It is a schematic diagram of a heat treatment system based on magnetic induction electric field provided in Embodiment 1;

[0049] Figure 2 It is a front view of a heat treatment system based on magnetic induction electric field provided in Embodiment 1;

[0050] Figure 3 It is a rear view of a heat treatment system based on magnetic induction electric field provided in Embodiment 1;

[0051] Figure 4 It is a side view of a heat treatment system based on magnetic induction electric field provided in Embodiment 1;

[0052] Figure 5 It is a top view of a heat treatment system based on magnetic induction electric field provided in Embodiment 1;

[0053] Figure 6 It is a schematic diagram of a toroidal core in Embodiment 1;

[0054] Figure 7 is a schematic diagram of a water-cooled sheet in Example 1;

[0055] Figure 8 is a schematic diagram of a glass tube in Example 1;

[0056] Figure 9 is a schematic diagram of another glass tube in Example 1;

[0057] Figure 10 is a comparison graph of the heating rate when treating different normal saline with a heat treatment system based on a magnetic induction electric field in Example 2;

[0058] Figure 11 is a comparison graph of the change in the total number of colonies before and after heat treatment of three fruit and vegetable juices with a heat treatment system based on a magnetic induction electric field and during storage in Example 3;

[0059] Figure 12 is a comparison graph of the scores of sensory evaluation indexes of vinegar after being treated with a heat treatment system based on a magnetic induction electric field (treatment group) and newly brewed vinegar (control group) in Example 4.

[0060] Explanation of reference numerals in the drawings: First sample injection bottle 101, second sample injection bottle 102, double-pump peristaltic pump 103, high-frequency excitation power supply 104, sample receiving bottle 105, heat treatment system 200, toroidal magnetic core 201, excitation coil 202, magnetic coupling tube 203, first glass tube 204, treatment chamber 205, water-cooled sheet 206, three-way adapter 207, base 208, salt bridge inlet 209, first connection port 210, first material flow inlet 211, first treatment chamber inlet 212, first water-cooling liquid inlet 213, first water-cooling liquid outlet 214, second glass tube 215, second material flow inlet 216, second treatment chamber inlet 217, second connection port 218, second water-cooling liquid inlet 219, second water-cooling liquid outlet 220, water-cooling system 300, total control power supply 301, water-cooling circulation pump 302, water-cooling radiator 303, first sample injection port 401, second sample injection port 402, sample outlet 403. Detailed implementation manners

[0061] To make the objectives, technical solutions and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0062] Example 1: Refer to Figures 1 - 9 , a heat treatment system based on a magnetic induction electric field provided in this example includes a first sample injection bottle 101, a second sample injection bottle 102, a double-pump peristaltic pump 103, a high-frequency excitation power supply 104, a sample receiving bottle 105, a heat treatment system 200, a water-cooling system 300, etc.

[0063] Please refer to Figures 2 - 5 As shown, the heat treatment system 200 includes: an annular magnetic core 201, an exciting coil 202, a magnetic coupling tube 203, a first glass tube 204, a second glass tube 215, a processing chamber 205, a water-cooling fin 206, a three-way adapter 207, a base 208, a first water-cooling liquid inlet 213, a second water-cooling liquid inlet 219, a first water-cooling liquid outlet 214, and a second water-cooling liquid outlet 220.

[0064] For convenience of description, hereinafter, the first sample injection bottle 101, the second sample injection bottle 102, the first glass tube 204, the first connection port 210, the first material flow inlet 211, the first processing chamber inlet 212, the first water-cooling liquid inlet 213, the first water-cooling liquid outlet 214, the second glass tube 215, the second material flow inlet 216, the second processing chamber inlet 217, the second connection port 218, the second water-cooling liquid inlet 219, and the second water-cooling liquid outlet 220 are respectively abbreviated as the first sample injection bottle 101, the second sample injection bottle 102, the first glass tube 204, the first connection port 210, the first material flow inlet 211, the first processing chamber inlet 212, the first water-cooling liquid inlet 213, the first water-cooling liquid outlet 214, the second glass tube 215, the second material flow inlet 216, the second processing chamber inlet 217, the second connection port 218, the second water-cooling liquid inlet 219, and the second water-cooling liquid outlet 220.

[0065] Please refer to Figures 2 - 3 As shown, in the heat treatment system 200, the exciting coil 202 is wound around the upper side of the annular magnetic core 201; the magnetic coupling tube 203 is wound around the left and right sides of the annular magnetic core 201; the exciting coil 202 is connected to the high-frequency exciting power supply 104.

[0066] Please refer to Figures 4 - 5 As shown, the heat treatment system 200 includes a first glass tube 204 and a second glass tube 215, which are respectively arranged at the front and rear positions of the annular magnetic core 201. A first material flow inlet 211 and a first processing chamber inlet 212 are provided above the first glass tube 204 (for convenience of description, the first glass tube 204 is also referred to as the front glass tube of the annular magnetic core), and a second material flow inlet 216 and a second processing chamber inlet 217 are also provided above the second glass tube 215 (for convenience of description, the first glass tube 204 is also referred to as the rear glass tube of the annular magnetic core). The first material flow inlet 211 and the second material flow inlet 216 are respectively connected to the first sample injection bottle 101 and the second sample injection bottle 102 through a double-pump head peristaltic pump; the first processing chamber inlet 212 and the second processing chamber inlet 217 are communicated through the processing chamber 205.

[0067] Please refer to again Figure 1 and Figure 7, the water cooling system 300 includes: a master control power supply 301, a water cooling circulation pump 302, and a water cooling radiator 303. Among them, the outlet of the water cooling circulation pump 302 is connected to the inlet 213 on the front water cooling fin in the heat treatment system 200. The outlet 214 of the front water cooling fin is communicated with the inlet 219 on the rear water cooling fin. The outlet 220 on the rear water cooling fin is connected to the inlet on the water cooling radiator 303, and the outlet on the water cooling radiator 303 is then connected to the water cooling circulation pump 302 to form a cycle; the water cooling liquid starts from the water cooling circulation pump 302 and enters the water cooling fin according to the above pipeline connection method. The water cooling liquid flows through the pipeline as Figure 7 shown to take away the heat in the toroidal magnetic core. The heat carried by the water cooling liquid is dissipated in the water cooling radiator 303, and finally the water cooling liquid returns to the water cooling circulation pump 302 to form a cycle.

[0068] The lower parts of the first glass tube 204 and the second glass tube 215 are connected through a magnetic coupling tube 203. Below the first glass tube 204 in front of the toroidal magnetic core, there is a salt bridge inlet 209. A mixed solid of sodium chloride with a concentration of 2%-40% (all are wt% unless otherwise specified below) and food-grade agar with a concentration of 1%-5% acts as the salt bridge. After being heated, the mixed solution enters the first glass tube 204 from the salt bridge inlet 209 under the action of a peristaltic pump (for the flow direction of the precursor solution of the salt bridge, please refer to Figure 2 the three arrows located below in the figure), and under the action of air pressure, the mixed solution enters the magnetic coupling tube 203 through the first connection port 210 on the first glass tube 204. After the magnetic coupling tube 203 is filled with the mixed solution, it then enters the second glass tube 215 through the second connection port 218 on the second glass tube 215 behind the toroidal magnetic core, and waits for the position of the mixed solution to fill to a position below the first material flow inlet 211 and the second material flow inlet 216 on the first glass tube 204 and the second glass tube 215. Then, the peristaltic pump is turned off and waits for the mixed solution to cool into a solid.

[0069] The upper parts of the first glass tube 204 and the second glass tube 215 are connected through a processing chamber 205. The liquid to be processed in the first sample injection bottle 101 and the second sample injection bottle 102 enters the first glass tube 204 and the second glass tube 215 through the first material flow inlet 211 and the second material flow inlet 216 under the action of a double-pump-head peristaltic pump 103, and then enters the processing chamber 205 through the first processing chamber inlet 212 and the second processing chamber inlet 217, and then flows to the sampling bottle 105 through a three-way adapter 207 in the processing chamber 205 (for the material flow direction, please refer to Figure 2The four upper arrows in [description] achieve the one-time continuous flow processing of materials; or only one sample bottle is set. Under the action of the double-pump peristaltic pump 103, the liquid material to be processed in the sample bottle enters the first glass tube 204 and the second glass tube 215 through the first material flow inlet 211 and the second material flow inlet 216, and then enters the processing chamber 205 through the first processing chamber inlet 212 and the second processing chamber inlet 217. Then, in the processing chamber 205, it returns to the sample bottle through a three-way adapter 207 to achieve the cyclic processing of materials.

[0070] One of the functions of setting the first glass tube 204 and the second glass tube 215 is to reduce the partial pressure effect of the material flow path in the processing chamber and increase the contact area between the material and the agar solid electrode; another function is to carry the agar solid salt bridge and act as the positive and negative poles of the secondary power supply in the secondary circuit. The main function of setting the agar solid salt bridge is to reduce the internal resistance of the secondary power supply, so that less magnetic induction voltage is distributed in the magnetic coupling tube 203, and thus more magnetic induction voltage or electric energy is distributed to the liquid material in the processing chamber 205, resulting in more electric energy being converted into heat energy in the material. This is because the agar solid salt bridge in the first glass tube 204, the second glass tube 215 and the magnetic coupling tube 203 has high conductivity and low resistance, which increases the output power and reduces the heat loss in the toroidal magnetic core 201 at the same time.

[0071] The first glass tube 204 and the second glass tube 215 are connected to the processing chamber 205 through the first processing chamber inlet 212 and the second processing chamber inlet 217 thereon. The exact middle of the processing chamber 205 is connected to the sample receiving bottle 105 through a three-way adapter 207. The processing chamber 205 refers to the pipeline between the first processing chamber inlet 212, the second processing chamber inlet 217 and the three-way connector 207.

[0072] The heat treatment system based on magnetic induction electric field provided in this embodiment can perform one-time continuous processing or cyclic processing on liquid materials. Figure 1 In [description], the first sample injection bottle 101, the second sample injection bottle 102 and the sample receiving bottle 105 are respectively used to store the materials before and after processing.

[0073] During the heat treatment of materials by the heat treatment system of this embodiment, the high-frequency excitation power supply 104 applies a high-frequency square-wave voltage to the excitation coil 202, causing an alternating magnetic field to be induced in the toroidal magnetic core 201. Since the agar solid salt bridge has a high conductivity, this alternating induced magnetic field generates an alternating induced electric field in the magnetic coupling tube 203 filled with the agar solid salt bridge. At this time, a huge induced electromotive force is formed between the first glass tube 204 and the second glass tube 215. And the liquid material also has a certain conductivity (10 μs / cm - 500 mS / cm), so the rapid heat treatment of the material is achieved under the synergistic action of the thermal effect (Ohmic heating or resistive heating) and non-thermal effect (electric field breakdown) of this induced electromotive force.

[0074] In the heat treatment system 200, the number of turns of the excitation coil above the toroidal magnetic core 201 is 1 - 6 turns, and the sum of the number of turns of the magnetic coupling tubes on the left and right sides of the toroidal magnetic core 201 is 16 - 50 turns; the ratio of the inner diameter of the processing chamber 205 to that of the first glass tube 204 or the second glass tube 215 ranges from 1:50 to 1:1, and the length of the processing chamber 205 is 10 - 100 cm; the magnetic induction current density in the processing chamber 205 is 0.2 - 2 A / cm 2 , and the magnetic induction electric field strength is 100 - 1000 V / cm.

[0075] In the heat treatment system 200, the soft magnetic material used for the toroidal magnetic core 201 is a magnetic conductive material, which includes iron-based nanocrystals, iron-based amorphous, cobalt-based amorphous, permalloy, ferrite, silicon steel sheets, etc.; the effective magnetic path length l of the toroidal magnetic core 201 is 50 - 150 cm, and the cross-sectional area A is 30 - 500 cm 2 ; the saturation magnetic induction intensity (Bs) of the toroidal magnetic core 201 is 0.5 - 2.03 T, the coercive force (Hc) is 0.4 - 40 A / m, the initial magnetic permeability (μi) is 1500 - 100000, the maximum magnetic permeability (um) is 6000 - 1000000, the resistivity is 30 - 5×10 7 μΩ / cm, and the Curie temperature is 220 - 750 °C. As Figure 6 shown, the effective magnetic path length l = (d1 + d2) × 2.

[0076] When using the heat treatment system 200 to heat-treat the material medium, the excitation voltage U is 220 V - 1800 V, the waveform is a double-peak pulse, the frequency f is 20 - 80 kHz, the duty cycle is 20% - 100%, and the flow rate range of the peristaltic pump is 5 mL / min - 300 mL / min.

[0077] The processing chamber 205 and the magnetic coupling tube 203 have electrical insulation properties, and materials such as silica gel, rubber, glass, polytetrafluoroethylene, low / high-density polyethylene, polyvinyl chloride, or polypropylene can be used.

[0078] The heat treatment system based on the magnetic induction electric field provided by this embodiment can complete the cyclic treatment of materials through the treatment chamber 205, or can also complete the continuous treatment of materials through the treatment chamber 205 at one time. It can be widely used in the green, efficient, and uniform heating, sterilization, or catalytic treatment of media such as liquid materials, biomass, and polymer materials, that is, it can be used for the heat treatment of liquid material media with a conductivity value range of 10 us / cm - 500 ms / cm in the treatment chamber.

[0079] To verify the heating effect, sterilization effect, and catalytic effect of the heat treatment system based on the magnetic induction electric field provided by this embodiment, the following Examples 2, 3, and 4 were obtained through experiments using normal saline, fruit and vegetable juices, and vinegar with different conductivities.

[0080] The measurement methods used in the experimental processes of the following Examples 2 - 4 are as follows:

[0081] Total colony determination: It is carried out according to the plate counting method in GB / T 4789.2 - 2016 "Food microbiological examination - Determination of total number of colonies";

[0082] Mold and yeast determination: It is carried out according to the plate counting method in GB / T 4789.15 - 2016 "Food microbiological examination - Enumeration of molds and yeasts".

[0083] Example 2: This example provides a method for heat - treating normal saline with different conductivities using the heat treatment system based on the magnetic induction electric field of Example 1.

[0084] Specifically, as Figure 1 shown, the heat treatment device based on the magnetic induction electric field used in this example includes: a first sample injection bottle 101, a second sample injection bottle 102, a double - pump head peristaltic pump 103, a high - frequency excitation power supply 104, a sample receiving bottle 105, a heat treatment system 200, and a water - cooling system 300; the heat treatment system 200 includes: an annular magnetic core 201, an excitation coil 202, a magnetic coupling tube 203, a first glass tube 204, a second glass tube 215, a treatment chamber 205, a water - cooling fin 206, a three - way adapter 207, a base 208, a first water - cooling liquid inlet 213, a second water - cooling liquid inlet 219, a first water - cooling liquid outlet 214, and a second water - cooling liquid outlet 220; the water - cooling system 300 includes: a total control power supply 301, a water - cooling circulation pump 302, and a water - cooling radiator 303.

[0085] In this example, the excitation coil 202 is wound above the annular magnetic core 201, the number of turns of the excitation coil 202 is 1 turn, and a voltage of 60 kHz, duty cycle 40%, and 600 V is applied to the excitation coil 202 through the high - frequency excitation power supply 104.

[0086] The magnetic conductive material of the toroidal magnetic core 201 is taken as an example of an iron-based nanocrystalline soft magnetic material, with an initial magnetic permeability ui of 80,000, a maximum magnetic permeability um of 400,000, a saturation magnetic induction intensity Bs of 1.25 T, a coercive force Hc of 1.2 A / m, a resistivity of 115 μΩ / cm, and a Curie temperature Tc of 570 °C; the effective magnetic conductive cross-sectional area of the toroidal magnetic core 201 is 42 cm 2 . The magnetic coupling tubes 203 are wound around the left and right sides of the toroidal magnetic core 201, with 15 turns on each side, and the total number of turns of the magnetic coupling tubes 203 is 30 turns; the magnetic coupling tubes 203 and the parts of the first glass tube 204 and the second glass tube 215 filled with agar solid salt bridges serve as the secondary power source; the first glass tube 204, the second glass tube 215, and the treatment chamber 205 serve as the pipelines for the liquid material to flow through. At this time, the first glass tube 204, the second glass tube 215, and the treatment chamber 205 are in a connected state; the cross-sectional area of the treatment chamber 205 is 0.28 cm 2 , and the cross-sectional areas of the first glass tube 204 and the second glass tube 215 are 7 cm 2 (the ratio of the cross-sectional area of the treatment chamber 205 to that of the first glass tube 204 or the second glass tube 215 is approximately 1:25), and the cross-sectional area of the magnetic coupling tube 203 is 0.28 cm 2 ; the material to be processed is pumped from the sample bottle by the double-pump head peristaltic pump 103 through the first glass tube 204 and the second glass tube 215 into the treatment chamber 205, and finally flows into the same sample bottle to achieve the cyclic processing of the material.

[0087] The conductivity of tap water is measured by a conductivity meter to be 473 μS / cm, the conductivity of 0.2% normal saline is 4320 μS / cm, the conductivity of 0.4% normal saline is 7840 μS / cm, and the conductivity of 0.6% normal saline is 11230 μS / cm. When the four kinds of liquid materials with different conductivities flow through the treatment chamber 205, the effective potential difference induced on both ends of the agar solid surface of the first glass tube 204 and the second glass tube 215 is measured by an oscilloscope combined with a high-voltage probe, and the length of the treatment chamber 205 is 20 cm. When the liquid material fills the entire pipeline of the treatment chamber 205, the impedance value is measured by an impedance analyzer. Therefore, the magnitude of the induced current and the induced current density in the treatment chamber 205 can be measured by calculation. In this embodiment, the first sampling port 401, the second sampling port 402, and the sampling port 403 of the liquid material are all immersed in a sample bottle for cyclic processing.

[0088] Set the flow rate of the double-pump head peristaltic pump to 300 mL / min for cyclic treatment, and immerse the multimeter temperature probe in the sample bottle to record the temperature rise of the material. After 200 mL of tap water with an initial room temperature of 25°C and a conductivity of 473 us / cm is cyclically treated in the heat treatment system of the magnetic induction electric field for 10 min, the tap water in the sample bottle rises from 25°C to 65°C, with a temperature rise of 40°C and a heating rate of 4°C / min; after 200 mL of normal saline (0.2%) with an initial room temperature of 25°C and a conductivity of 4320 us / cm is cyclically treated in the heat treatment system of the magnetic induction electric field for 4.5 min, the normal saline (0.2%) rises from 25°C to 93°C, with a temperature rise of 68°C and a heating rate of 15.11°C / min; after 200 mL of normal saline (0.4%) with an initial room temperature of 25°C and a conductivity of 7840 us / cm is cyclically treated in the heat treatment system of the magnetic induction electric field for 3 min, the normal saline (0.4%) rises from 25°C to 95°C, with a temperature rise of 70°C and a heating rate of 23.33°C / min; after 200 mL of normal saline (0.6%) with an initial room temperature of 25°C and a conductivity of 11230 us / cm is cyclically treated in the heat treatment system of the magnetic induction electric field for 2 min, the normal saline (0.6%) rises from 25°C to 90°C, with a temperature rise of 65°C and a heating rate of 32.5°C / min.

[0089] The temperature rise rates of the liquid materials with different conductivities are as follows Figure 10 As shown, the heat treatment system and method based on the magnetic induction electric field provided in this embodiment have a heating effect on the liquid material with a certain conductivity, and the heating rate increases with the increase of the conductivity.

[0090] All in all, compared with the existing heat treatment technology, the method of this embodiment realizes the uniform, efficient and green heat treatment of liquid materials, and has potential industrial application value.

[0091] Example 3: This example provides a method for heat treatment and sterilization of carrot juice, mango juice and orange juice by using the heat treatment system based on the magnetic induction electric field of Example 1.

[0092] Specifically, as Figure 1As shown in the figure, the heat treatment system based on the magnetic induction electric field adopted in this embodiment includes: a first sample injection bottle 101, a second sample injection bottle 102, a double-pump peristaltic pump 103, a high-frequency excitation power supply 104, a sample receiving bottle 105, a heat treatment system 200, and a water cooling system 300. The heat treatment system 200 includes: an annular magnetic core 201, an excitation coil 202, a magnetic coupling tube 203, a first glass tube 204, a second glass tube 215, a treatment chamber 205, a water cooling fin 206, a three-way adapter 207, a base 208, a first water cooling liquid inlet 213, a second water cooling liquid inlet 219, a first water cooling liquid outlet 214, and a second water cooling liquid outlet 220. The water cooling system 300 includes: a total control power supply 301, a water cooling circulation pump 302, and a water cooling radiator 303.

[0093] In this embodiment, the excitation coil 202 is wound above the annular magnetic core 201. The number of turns of the excitation coil 202 is 1 turn. A voltage of 40 kHz, a duty cycle of 80%, and 600 V is applied to the excitation coil 202 through the high-frequency excitation power supply 104.

[0094] Taking the ferromagnetic nanocrystalline soft magnetic material as an example for the magnetic conductive material of the annular magnetic core 201, its initial magnetic permeability ui is 80,000, the maximum magnetic permeability um is 400,000, the saturation magnetic induction intensity Bs is 1.25 T, the coercive force Hc is 1.2 A / m, the resistivity is 115 uΩ / cm, and the Curie temperature Tc is 570 °C; the effective magnetic conductive cross-sectional area of the annular magnetic core 201 is 42 cm 2 . The magnetic coupling tube 203 is wound around the left and right sides of the annular magnetic core 201, with 15 turns on each side, and the total number of turns of the magnetic coupling tube 203 is 30 turns; the parts of the magnetic coupling tube 203 and the first glass tube 204, the second glass tube 215 filled with agar solid salt bridge serve as a secondary power supply and are in direct contact with the material; the first glass tube 204, the second glass tube 215, and the treatment chamber 205 serve as pipelines for the liquid material to flow through. At this time, the first glass tube 204, the second glass tube 215, and the treatment chamber 205 are in a connected state; the cross-sectional area of the treatment chamber 205 is 0.28 cm 2 , the cross-sectional areas of the first glass tube 204 and the second glass tube 215 are 7 cm 2 , (the ratio of the cross-sectional area of the treatment chamber 205 to that of the first glass tube 204 or the second glass tube 215 is about 1:25) the cross-sectional area of the magnetic coupling tube 203 is 0.28 cm 2 ; The material is pumped from the first sample injection bottle 101 and the second sample injection bottle 102 by the double-pump peristaltic pump 103 through the first glass tube 204 and the second glass tube 215 into the treatment chamber 205, and finally into the sample receiving bottle 105, realizing the one-time continuous treatment of the liquid material.

[0095] The conductivity of carrot juice measured by a conductivity meter is 5420 us / cm, the conductivity of mango juice is 9830 us / cm, and the conductivity of orange juice is 14450 us / cm. When the fruit and vegetable juices with three different conductivities flow through the treatment chamber 205, the effective potential difference induced on both ends of the agar solid surface of the first glass tube 204 and the second glass tube 215 is measured by combining an oscilloscope with a high-voltage probe. The length of the treatment chamber 205 is 20 cm. When the liquid material fills the entire pipeline of the treatment chamber 205, its impedance size is measured by an impedance analyzer. Therefore, the magnitude of the induced current and the induced current density in the treatment chamber 205 can be measured by calculation. In this embodiment, the sample inlets 401 and 402 of the liquid material are respectively immersed in the first sample bottle 101 and the second sample bottle 102, and the sample outlet 403 of the liquid material is connected to the sample receiving bottle 105 to achieve one-time continuous flow treatment.

[0096] A double-pump head peristaltic pump is set for one-time continuous treatment, and a multimeter temperature probe is immersed in the sample bottle to record the temperature rise of the material. After the carrot juice with a peristaltic pump flow rate of 50 mL / min, an initial room temperature of 25 °C, and a conductivity of 5420 us / cm is treated in the heat treatment device of the magnetic induction electric field for 8 s, the temperature of the carrot juice rises from 25 °C to 85 °C; after the mango juice with a peristaltic pump flow rate of 100 mL / min, an initial room temperature of 25 °C, and a conductivity of 9830 us / cm is treated in the heat treatment system of the magnetic induction electric field for 6 s, the temperature of the mango juice rises from 25 °C to 87 °C; after the orange juice with a peristaltic pump flow rate of 150 mL / min, an initial room temperature of 25 °C, and a conductivity of 14450 us / cm is treated in the heat treatment system of the magnetic induction electric field for 4 s, the temperature of the orange juice rises from 25 °C to 84 °C.

[0097] Before sample treatment, the total colony counts of carrot juice, mango juice, and orange juice are respectively (5.02 ± 0.01) lg CFU / mL, (4.53 ± 0.01) lg CFU / mL, (3.59 ± 0.02) lg CFU / mL, and the total colony counts of molds and yeasts are respectively (4.98 ± 0.01) lg CFU / mL, (4.45 ± 0.02) lg CFU / mL, (3.41 ± 0.01) lg CFU / mL; after being treated by the heat treatment device of this application, the total colony counts of the three fruit and vegetable juices and the total colony counts of molds and yeasts are not detected, almost all are killed, achieving the sterilization effect.

[0098] After storing for 7 d at 4 °C, the growth conditions of the total colony counts of the three fruit and vegetable juices and the total colony counts of molds and yeasts are as follows Figure 11As shown, the heat treatment system and method based on magnetic induction electric field provided in this embodiment achieve low-temperature sterilization of liquid materials. From the perspectives of sterilization effect and storage period results, the effect of the method in this embodiment is equivalent to that of pasteurization, and even better than pasteurization treatment. This embodiment utilizes the synergistic effect of the thermal effect and non-thermal effect of the induction electric field to achieve the low-temperature sterilization effect, and better retains the nutritional value and flavor of fruit and vegetable juices.

[0099] Example 4: This embodiment provides a method for heat treatment, aging and ripening of black vinegar and rice vinegar by using the heat treatment system based on magnetic induction electric field in Example 1.

[0100] Specifically, as Figure 1 shown, the heat treatment system based on magnetic induction electric field adopted in this embodiment includes: a first sampling bottle 101, a second sampling bottle 102, a double-pump peristaltic pump 103, a high-frequency excitation power supply 104, a heat treatment system 200 and a water cooling system 300. The heat treatment system 200 includes: a toroidal magnetic core 201, an excitation coil 202, a magnetic coupling tube 203, a first glass tube 204, a second glass tube 215, a treatment chamber 205, water cooling fins 206, a three-way adapter 207, a base 208, a first water cooling inlet 213, a second water cooling inlet 219, a first water cooling outlet 214, and a second water cooling outlet 220. The water cooling system 300 includes: a master control power supply 301, a water cooling circulation pump 302, and a water cooling radiator 303.

[0101] In this embodiment, the excitation coil 202 is wound above the toroidal magnetic core 201. The number of turns of the excitation coil 202 is 1 turn, and a voltage of 60 kHz, a duty cycle of 60%, and 600 V is applied to the excitation coil 202 through the high-frequency excitation power supply 104.

[0102] The magnetic conductive material of the toroidal magnetic core 201 is taken as an iron-based nanocrystalline soft magnetic material. Its initial magnetic permeability ui is 80,000, the maximum magnetic permeability um is 400,000, the saturation magnetic induction intensity Bs is 1.25 T, the coercive force Hc is 1.2 A / m, the resistivity is 115 μΩ / cm, and the Curie temperature Tc is 570 °C; the effective magnetic conductive cross-sectional area of the toroidal magnetic core 201 is 42 cm 2 . The magnetic coupling tube 203 is wound around the left and right sides of the toroidal magnetic core 201, with 15 turns on each side, and the total number of turns of the magnetic coupling tube 203 is 30 turns; the parts of the magnetic coupling tube 203 and the first glass tube 204, the second glass tube 215 filled with agar solid salt bridge serve as the secondary power supply and are in direct contact with the material; the first glass tube 204, the second glass tube 215 and the treatment chamber 205 serve as the pipelines for the liquid material to flow through. At this time, the first glass tube 204, the second glass tube 215 and the treatment chamber 205 are in a connected state; the cross-sectional area of the treatment chamber 205 is 0.28 cm 2, the cross-sectional areas of the first glass tube 204 and the second glass tube 215 are 7 cm 2 , (the ratio of the cross-sectional area of the processing chamber 205 to that of the first glass tube 204 or the second glass tube 215 is about 1:25) the cross-sectional area of the magnetic coupling tube 203 is 0.28 cm 2 ; The material is fed from the first sample bottle 101 and the second sample bottle 102 by the double-pump head peristaltic pump 103 through the first glass tube 204 and the second glass tube 215 into the processing chamber 205, and finally into the sample receiving bottle 105, realizing the one-time continuous processing of the liquid material.

[0103] The conductivity of black vinegar measured by the conductivity meter is 30.18 ms / cm, and the conductivity of rice vinegar is 2980 us / cm. When the two kinds of vinegar with different conductivities flow through the processing chamber 205, the effective potential difference induced on the surface of the agar solid at both ends of the first glass tube 204 and the second glass tube 215 is measured by combining an oscilloscope with a high-voltage probe. The length of the processing chamber 205 is 20 cm. When the liquid material fills the entire pipeline of the processing chamber 205, the impedance value is measured by an impedance analyzer. Therefore, the magnitude of the induced current and the induced current density in the processing chamber 205 can be measured by calculation. In this embodiment, the first sample inlet 401 and the second sample inlet 402 of the liquid material are respectively immersed in the first sample bottle 101 and the second sample bottle 102, and the sample outlet 403 of the liquid material is connected to the sample receiving bottle 105 to realize one-time continuous flow processing.

[0104] A double-pump head peristaltic pump is set for one-time continuous processing, and the universal meter temperature probe is immersed in the sample bottle to record the temperature rise of the material. The flow rate of the peristaltic pump is 80 mL / min. After the black vinegar with an initial room temperature of 20 °C and a conductivity of 30.18 ms / cm is processed in the heat treatment system of the magnetic induction electric field for 3.5 s, the temperature of the black vinegar rises from 20 °C to 60 °C, with a temperature rise of 40 °C; the flow rate of the peristaltic pump is 40 mL / min. After the rice vinegar with an initial room temperature of 20 °C and a conductivity of 2980 us / cm is processed in the heat treatment system of the magnetic induction electric field for 7 s, the temperature of the rice vinegar rises from 20 °C to 55 °C, with a temperature rise of 35 °C;

[0105] According to Table 1, the sensory evaluation of the black vinegar and rice vinegar processed by using the heat treatment system and method based on the magnetic induction electric field provided in this embodiment is carried out, and the obtained sensory evaluation results are as follows Figure 12 as shown. The total score of the sensory indexes of the black vinegar and rice vinegar processed in this embodiment is significantly higher than that of newly brewed vinegar; the changes in color and morphology before and after processing are not very large, but the aroma and taste are greatly improved. Generally speaking, the black vinegar and rice vinegar processed in this embodiment are closer to the black vinegar and rice vinegar aged for one year in all aspects, realizing the rapid catalysis and aging of vinegar.

[0106] Table 1: Sensory scoring standard for vinegar

[0107]

[0108]

[0109] Comparative Example 1: A heat treatment system and method based on magnetic induction electric field used in this comparative example are basically the same as those in Example 1, except that the cross-sectional area ratio of the treatment chamber 205 to the first glass tube 204 or the second glass tube 215 is different from that in Example 1.

[0110] As described above, in the heat treatment system based on magnetic induction electric field provided in Example 1, one of the functions of setting the first glass tube 204 and the second glass tube 215 is to reduce the partial pressure effect of the material flow path in the treatment chamber and increase the contact area between the material and the agar solid electrode; another function is to carry the agar solid salt bridge and act as the positive and negative poles of the secondary power supply in the secondary circuit. The main function of setting the agar solid salt bridge is to reduce the internal resistance of the secondary power supply, so that less magnetic induction voltage is distributed in the magnetic coupling tube 203, and thus more magnetic induction voltage or electric energy is distributed to the liquid in the treatment chamber 205, resulting in more electric energy being converted into heat energy in the material. This is because the agar solid salt bridges in the two first glass tubes 204, the second glass tube 215 and the magnetic coupling tube 203 have high conductivity and low resistance, which increases the output power and reduces the heat loss in the toroidal magnetic core 201 at the same time. In order to make the treatment chamber 205 receive more magnetic induction voltage and make the current density and electric field strength in it reach the treatment threshold where the thermal effect and non-thermal effect are coordinated, the cross-sectional area ratio range of the treatment chamber 205 to the first glass tube 204 or the second glass tube 215 is limited to 1:50 - 1:1 in Example 1.

[0111] The following takes physiological saline (0.2%) with a conductivity of 4320 us / cm as an example for a control experiment to verify the influence of the ratio of the cross-sectional area of the treatment chamber 205 to the first glass tube 204 or the second glass tube 215 on the treatment effect of physiological saline. The experimental results of the relevant control experiments are shown in Table 2 below:

[0112] Table 2: Experimental results with different ratios of the cross-sectional area of the treatment chamber 205 to the first glass tube 204 or the second glass tube 215

[0113]

[0114] In Table 2, the temperature of the liquid before treatment is room temperature 25°C; the temperature after treatment is the temperature of the liquid after passing through the heat treatment device; the treatment time is the circulation time of the liquid in the treatment chamber 205, which can be realized by a timer.

[0115] When the cross-sectional area ratio of the processing chamber 205 to the first glass tube 204 or the second glass tube 215 is not within the range of 1:50 - 1:1, if it is greater than 1:1, it will lead to a lower induced electromotive force at both ends of the processing chamber 205, resulting in the current density and electric field strength in the processing chamber 205 not meeting the requirements. Moreover, the toroidal core 201 heats up severely and the toroidal core loss is serious, thus unable to achieve the synergistic heat treatment effect of thermal effect and non-thermal effect. If it is less than 1:50, the diameter of the processing chamber 205 will be smaller, which greatly limits the flow rate and processing capacity. Although the heat treatment effect is better, the processing capacity is very limited. An appropriate cross-sectional area ratio of the processing chamber 205 to the magnetic coupling tube 203, such as 1:25, etc., can achieve a better heat treatment effect, with a short processing time, a fast heating rate, and uniform heating.

[0116] Comparative Example 2: This comparative example is based on CN112167501 A, and a continuous-flow magnetic induction electric field low-temperature sterilization device is used to perform heat treatment on physiological saline (0.2%) with a conductivity of 4320 us / cm. The dimensions, materials, etc. of each component in the continuous-flow magnetic induction electric field low-temperature sterilization device and the corresponding process conditions are basically the same as those in Example 2. The change in the surface temperature of the magnetic core is monitored by an infrared thermal imager; the temperature probe of a multimeter is immersed in the sample bottle to record the temperature rise of the material; the effective potential difference induced at both ends of the agar solid surface of the first glass tube 204 and the second glass tube 215 is measured by an oscilloscope combined with a high-voltage probe; the internal resistance of the secondary power supply and the load impedance are measured by an impedance analyzer. Therefore, the induced current magnitude and induced current density in the processing chamber 205 can be measured by calculation. The parameter comparison and experimental result comparison between Comparative Example 2 and Example 2 are shown in Tables 3 and 4 below:

[0117] Table 3: Parameter comparison between Comparative Example 2 and Example 2

[0118] Core temperature (°C) Effective voltage (V) Internal resistance of secondary power supply (Ω) Load impedance (Ω) Comparative Example 2 150-180 2840 65300 20700 Example 2 35-50 9140 21 11453

[0119] Table 4: Experimental result comparison between Comparative Example 2 and Example 2

[0120] Temperature of the treated liquid (°C) <![CDATA[Current density (A / cm 2 )]]> Electric field strength in the treatment chamber (v / cm) Comparative Example 2 59 0.49 142 Example 2 93 2.85 457

[0121] In Table 4, the temperature of the liquid before treatment is room temperature 25°C; the temperature after treatment is the temperature of the liquid after passing through the heat treatment device; the treatment time is the circulation time of the liquid in the processing chamber 205, which can be achieved by a timer.

[0122] The results show that: compared with Comparative Example 2, the core temperature of Example 2 remains below 50°C and can operate continuously. The salt bridge structure significantly reduces the internal resistance of the secondary power supply, and the effective voltage at both ends of the processing chamber is increased; at the same time, the heating rate of the liquid in Example 2 is faster, and the current density and electric field strength are significantly increased. This is because the internal resistance of the secondary power supply of the continuous-flow magnetic induction electric field low-temperature sterilization device used in Comparative Example 2 is too large and the secondary load impedance is too large, resulting in a small effective voltage, and correspondingly reduced current density and electric field strength.

[0123] It should be understood that the above are only some embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the creative concept of the present invention, other deformations and improvements can be made, and these all belong to the protection scope of the present invention.

Claims

1. A heat treatment system based on a magnetic induction electric field, comprising an annular magnetic core (201), a first tube body (204), a second tube body (215) and a processing chamber (205). Magnetic coupling tubes (203) are wound around the left and right sides of the annular magnetic core (201) respectively, and the first tube body (204) and the second tube body (215) are arranged in front of and behind the annular magnetic core (201) respectively; characterized in that: An exciting coil (202) is wound around the upper side of the toroidal magnetic core (201), and the exciting coil (202) is electrically connected to a high-frequency exciting power supply (104); A salt bridge inlet (209) and a first connection port (210) are provided at the lower part of the first tube body (204), a first processing chamber inlet (212) is provided at one side of the upper part, and a first material flow inlet (211) is provided at the top end; A second connection port (218) is provided at the lower part of the second tube body (215), a second processing chamber inlet (217) is provided at one side of the upper part, and a second material flow inlet (216) is provided at the top end; The first material flow inlet (211) and the second material flow inlet (216) are respectively communicated with a material supply device, the first connection port (210) and the second connection port (218) are communicated through a magnetic coupling tube (203), the first processing chamber inlet (212) and the second processing chamber inlet (217) are communicated through a processing chamber (205), and the processing chamber (205) is also communicated with a material receiving device; The salt bridge inlet (209) is used to inject a precursor solution of the salt bridge into the first tube body (204), and the precursor solution of the salt bridge is used to fill the area below the first material flow inlet (211) in the first tube body (204), the area below the second material flow inlet (216) in the second tube body (215), and the magnetic coupling tube (203) and solidify to form a salt bridge. The first processing chamber inlet (212) is higher than the top surface of the salt bridge in the first tube body (204), and the second processing chamber inlet (217) is higher than the top surface of the salt bridge in the second tube body (215).

2. The heat treatment system based on magnetic induction electric field according to claim 1, characterized in that: Two first connection ports (210) are provided at the lower part of the first tube body (204).

3. The heat treatment system based on magnetic induction electric field according to claim 1, characterized in that: Two second connection ports (218) are provided at the lower part of the second tube body (215).

4. The heat treatment system based on a magnetic induction electric field according to claim 1, characterized in that: The salt bridge inlet (209) is arranged at the bottom end of the first tube body (204).

5. The heat treatment system based on a magnetic induction electric field according to claim 1, wherein: The salt bridge contains sodium chloride with a concentration of 2wt%-40wt% and food-grade agar with a concentration of 1wt%-5wt%.

6. The heat treatment system based on the magnetic induction electric field according to claim 1, characterized in that: The first tube body (204) and the second tube body (215) are made of glass tubes.

7. The heat treatment system based on a magnetic induction electric field according to claim 1, wherein: The ratio of the inner diameter of the processing chamber (205) to that of the first tube body (204) or the second tube body (215) is 1:50 - 1:

1.

8. The heat treatment system based on a magnetic induction electric field according to claim 1, characterized in that: The length of the processing chamber (205) is 10 - 100 cm.

9. The heat treatment system based on magnetic induction electric field according to claim 1, characterized in that: The magnetic induction current density in the processing chamber (205) is 0.2 - 1 A / cm 2 , and the magnetic induction electric field strength is 100 - 1000 V / cm.

10. The heat treatment system based on a magnetic induction electric field according to claim 1, characterized in that: The sum of the number of turns of all the magnetic coupling tubes (203) is 16 - 50 turns.

11. The heat treatment system based on magnetic induction electric field according to claim 1, wherein: The number of turns of the exciting coil (202) is 1 - 6 turns.

12. The heat treatment system based on a magnetic induction electric field according to claim 1, wherein: The processing chamber (205) is made of an electrically insulating material.

13. The heat treatment system based on a magnetic induction electric field according to claim 1, wherein: The annular magnetic core (201) has an effective magnetic path length of 50-150 cm and a cross-sectional area of 30-500 cm 2 .

14. The heat treatment system based on a magnetic induction electric field according to claim 1, characterized in that: The annular magnetic core (201) is formed of a magnetic conductive material, wherein the magnetic conductive material has a saturation magnetic induction intensity of 0.5-2.03 T, a coercive force of 0.4-40 A / m, an initial magnetic permeability of 1500-100000, a maximum magnetic permeability of 6000-1000000, and a resistivity of 30-5×10 7 μΩ / cm, Curie temperature is 220-750 ℃.

15. The heat treatment system based on a magnetic induction electric field according to claim 1, characterized in that, It further includes a water-cooling fin (206) connected to the toroidal magnetic core (201). A cooling medium channel is provided in the water-cooling fin, and the cooling medium channel is connected to a water-cooling circulation pump (302) and a water-cooling radiator (303) through a water-cooling liquid inlet and a water-cooling liquid outlet provided on the water-cooling fin (206) to form a circulating water-cooling system.

16. The heat treatment system based on a magnetic induction electric field according to claim 15, characterized in that: There are two water-cooling fins (206), which are symmetrically arranged in front of and behind the toroidal magnetic core (201). At the same time, the two water-cooling fins (206) are connected in series in the circulating water-cooling system.

17. The heat treatment system based on the magnetic induction electric field according to claim 1, wherein: The material supply device includes more than one sample injection bottle, and the sample injection bottles are respectively communicated with the first material inlet (211) and the second material inlet (216) through peristaltic pumps.

18. The heat treatment system based on magnetic induction electric field according to claim 1, characterized in that: The material receiving device includes a sample receiving bottle (105).

19. The heat treatment system based on a magnetic induction electric field according to claim 1, wherein: The material supply device and the material receiving device share a material storage container.

20. A heat treatment method based on a magnetic induction electric field, characterized in that, Comprising: Providing the heat treatment system based on a magnetic induction electric field according to any one of claims 1-19; Injecting a precursor solution of the salt bridge from the salt bridge inlet (209) into the first tube body (204), and filling the region of the first tube body (204) below the first material inlet (211), the region of the second tube body (215) below the second material inlet (216), and the magnetic coupling tube (203) with the precursor solution of the salt bridge and solidifying to form a salt bridge; Applying an excitation voltage to the excitation coil (202) with a high-frequency excitation power supply (104); Making the material provided by the material supply device enter the first tube body (204) and the second tube body (215) from the first material inlet (211) and the second material inlet (216) at a set flow rate, then flowing to the processing chamber (205), and then being output from the processing chamber (205) and entering the material receiving device, Alternatively, making the material provided by the material supply device enter the first tube body (204) and the second tube body (215) from the first material inlet (211) and the second material inlet (216) at a set flow rate, then flowing to the processing chamber (205), and then being output from the processing chamber (205) and entering the material supply device again; Wherein, the material is selected from liquid materials with a conductivity of 10 us / cm - 500 ms / cm.

21. The heat treatment method according to claim 20, characterized in that: The excitation voltage is 220V - 1800V, the waveform is a double-peak pulse, the frequency is 20 - 80 kHz, and the duty cycle is 20% - 100%.

22. The heat treatment method according to claim 20, wherein: The set flow rate is 5 mL / min - 300 mL / min.

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