WO2020133099A1 - Continuous induction heating reactor - Google Patents

Abstract

Disclosed is a continuous induction heating reactor, comprising a magnetic loop (101), a primary coil (102), a magnetic coupling tube (103) and a reaction cavity (104), wherein the magnetic loop (101) is made of a magnetically conductive material; the primary coil (102) and the magnetic coupling tube (103) are both wound around the magnetic loop (101), and the magnetic coupling tube (103) is connected to the reaction cavity (104); and a sample inlet (201) and a sample outlet (202) are arranged in the exact middle of the magnetic coupling tube (103) or the reaction cavity (104). The continuous inductive heating reactor heats a low-magnetic-conductivity sample with an electrical conductivity without any metal pole plate and electrode and without any external heat source or radiation, and is suitable for an open continuous flow treatment.

Description

Continuous induction thermal reactor Technical field

The invention relates to a continuous induction thermal reactor, which belongs to the technical field of chemical industry, food and environment.

Background technique

In the last century, in order to achieve magnetocaloric sterilization in developed countries such as Europe and the United States, researchers placed the liquid food coil in an alternating magnetic field, hoping to use induced current to induce its inductive heating effect. Unfortunately, it was not included in the sample. The occurrence of thermal effects has been observed, that is, the magnetocaloric sterilization of liquid food cannot be achieved (Reference: Sudhir K. Sastry; Jeffrey T. Barach. Ohmic heating and inductive heating. Journal of Food Science, 65(4), 42-46. ). This is because normally, liquid samples (liquid foods, biochemical solutions, plant extracts, organic waste liquids, etc.) have very low magnetic permeability, that is, their relative magnetic permeability is close to zero, so they will not cross The variable magnetic field produces a response. That is to say, when the alternating magnetic field directly acts on the above-mentioned low-permeability liquid sample, there will be no eddy current effect (eddy current or induced current) inside the sample, and no thermal effect will occur. All kinds of chemical reactions, sterilization treatment, extraction and hydrolysis processing need to input energy to the materials. Therefore, the heat treatment technology is expected to be able to perform high-efficiency heating on the sample and complete an extremely fast heat and mass transfer process inside the sample. In the past few decades, various new physics-assisted heating technologies have been conceived, such as radio frequency heating, microwave heating, and ohmic heating, which can quickly heat the above liquid samples. Although the traditional induction heating technology uses an alternating magnetic field as the excitation source, it can only heat iron-based materials with high magnetic permeability.

In addition to high-efficiency heating, the above technologies (RF heating, microwave heating, ohmic heating) also have different degrees of difference. Radio frequency heating and microwave heating belong to dielectric heating technology. They use electromagnetic waves of different frequencies to excite molecules with different dipole moments to cause heat. Ohm heating, also known as Joule heating or resistance heating, usually uses metal plates to directly contact the sample, and uses an electric field to excite a sufficiently large current density inside the conductive sample to induce rapid heat generation. However, ohmic heat treatment can cause poor electrochemical reactions between the plates, lead to corrosion or scaling of the plates, lower processing efficiency, heavy metal leakage, and sample contamination. Especially in acidic and alkaline environments, and high current density, the above problems will appear immediately, so it greatly limits the scope of application of ohmic heating. In addition, although RF heating also uses metal plates, the sample does not need to be in direct physical contact with it, so the above problems do not occur, but the sample temperature rise rate is not as good as that of ohmic electric field treatment. This is because the specific frequency electromagnetic wave emitted by the polar plate in the radio frequency heating only acts on the macromolecular substance whose physical size is equivalent to the wavelength of the electromagnetic wave.

At present, neither academia nor industry can directly use alternating magnetic fields to stimulate low permeability samples to generate heat rapidly. In response to the above problems, there is an urgent need to develop a new type of physics heating reactor.

Summary of the invention

The continuous induction thermal reactor according to the present invention uses alternating magnetic flux in a magnetic circuit to excite a continuous flow of low-permeability materials or reaction medium to allow it to quickly generate heat. And by setting the sample inlet and the sample outlet at the center of the magnetic coupling tube or the reaction chamber, the continuous flow materials or reaction media of each branch in the reaction chamber are guaranteed to have equal residence time. The continuous flow materials or reaction media can be The continuous processing is completed through the reaction chamber at one time. When a large number of continuous flow materials or reaction media are processed, the thermal reaction process of all continuous flow materials or reaction media can be continuously completed without manual intervention.

In addition to realizing rapid heat and mass transfer to liquid samples, the continuous induction thermal reactor is green and pollution-free, and is suitable for use in thermal sterilization, thermal killing of enzymes, thermal extraction, and catalytic synthesis. The core parameters of the continuous induction thermal reactor are the initial permeability of the magnetically permeable material of the magnetic circuit and the total magnetic flux Φ it can carry, where the total magnetic flux Φ is equal to the magnetic flux density B in the magnetic circuit and the effective conductance of the magnetic circuit The product of the magnetic area S, that is Φ=BS. The voltage ratio between the primary coil and the magnetic coupling tube follows Faraday's principle of electromagnetic induction. The impedance Z of the material or reaction medium in the reaction chamber can be tested using an impedance analyzer, so as to estimate its induced current density J according to Ohm's law, that is, I = U/Z, J = I/S, where U-the reaction chamber two The induced voltage at the terminal is the effective potential difference; I—the induced current intensity in the reaction chamber; S—the cross-sectional area of the reaction chamber.

The continuous induction thermal reactor can be modularly connected in series to improve processing efficiency.

The first object of the present invention is to provide a continuous induction thermal reactor, including: a magnetic circuit, a primary coil, a magnetic coupling tube, and a reaction chamber;

Among them, the sample inlet and the sample outlet are set at the center of the magnetic coupling tube or the reaction chamber, to ensure that the continuous flow of materials or reaction media of each branch stay in the reaction chamber for the same time, and the continuous flow of materials or reaction media is one-off Complete continuous processing through the reaction chamber;

The magnetic circuit is composed of a magnetically conductive material. The primary coil and the magnetic coupling tube are wound around the magnetic circuit. The magnetic coupling tube is connected to the reaction chamber. The continuous induction thermal reactor includes at least one magnetic coupling tube and at least one reaction chamber.

In one embodiment, the reaction chamber and the magnetic coupling tube are supports for the flow of the reaction medium and have electrical insulation, and the inner diameter of the reaction chamber is smaller than the inner diameter of the magnetic coupling tube.

In one embodiment, the ratio of the cross-sectional area of the reaction chamber to the cross-sectional area of the magnetic coupling tube is 1:1.3 to 1:50.

In one embodiment, after the power source applies a voltage to the primary coil, the total magnetic flux carried in the magnetic circuit ranges from 0-10 Wb, and the initial magnetic permeability of the magnetic circuit is 800-90000.

In one embodiment, the alternating magnetic flux in the magnetic circuit can cause a low-permeability reaction medium in the magnetic coupling tube to produce an effective potential difference, causing the material or reaction medium in the reaction chamber to induce current The density is 1-80 A/cm ² to cause the sample to quickly generate heat.

In one embodiment, the conductivity of the material or reaction medium is in the range of 0.1-40 S/m.

In one embodiment, the induction current loop exists only between the magnetic coupling tube and the reaction chamber, and the sample inlet and the sample outlet have no leakage, are safe, and are used for open continuous flow processing.

In one embodiment, the reaction chamber and the magnetic coupling tube have electrical insulation.

A second object of the present invention is to provide a heating device that uses the above-described continuous induction heat reactor, and the heating device heats a substance having a conductivity in the range of 0.1-40 S/m.

In one embodiment, the substance is a flowable substance.

The third object of the present invention is to provide the application of the continuous induction thermal reactor and/or the heating device in the fields of chemical industry, food and environment.

The beneficial effects of the invention

The continuous induction thermal reactor provided by the invention enables the material with low permeability or the reaction medium to quickly generate heat by using an alternating magnetic field and a reasonable circuit structure design; and by setting the inlet and outlet to the magnetic field The central position of the coupling tube or reaction chamber ensures that the continuous flow materials or reaction media of each branch stay in the reaction chamber for the same time. The samples can be processed continuously through the reaction chamber at one time. For large batches of continuous flow materials Or when the reaction medium is processed, the thermal reaction process of all continuous flow materials or reaction medium can be completed continuously without manual intervention. The induction thermal reactor does not use any metal plates and electrodes for heating the sample, has no external heat source and radiation, is green and efficient, and is suitable for continuous processing.

Working principle of the invention

The principle of the induction thermal reactor is to use the alternating magnetic field in the magnetic circuit to induce an effective potential difference in the material or the reaction medium fluid based on the closed circuit structure, amplify the induced current, and make the low permeability sample with conductivity quickly generate heat.

BRIEF DESCRIPTION

In order to more clearly explain the technical solutions in the embodiments of the present invention, the drawings required in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For a person of ordinary skill in the art, without paying any creative work, other drawings can be obtained based on these drawings.

FIG. 1 is a schematic diagram of a continuous induction thermal reactor I;

Figure 2 is a schematic diagram of a continuous induction thermal reactor II;

Figure 3 is a schematic diagram of continuous induction thermal reactor III;

Among them, 101-magnetic circuit; 102-primary coil; 103-magnetic coupling tube; 104-reaction chamber; 201-sample inlet; 202-sample outlet.

detailed description

In view of the shortcomings in the prior art, the inventor of the present application has been able to propose the technical solution of the present invention through long-term research and extensive practice. The technical solution, its implementation process and principle will be further explained as follows.

Example 1

The continuous induction thermal reactor I, as shown in FIG. 1, includes a magnetic circuit 101, a primary coil 102, a magnetic coupling tube 103, and a reaction chamber 104;

Among them, the primary coil 102 is wound on the magnetic circuit 101, the number of turns of the primary coil 102 is 6 turns, 500V voltage is applied to the primary coil 102 by the power supply, the magnetic flux in the magnetic circuit 101 is 0.06Wb, at this time, the conduction of the magnetic circuit 101 The magnetic material is cold-rolled silicon steel, the initial relative permeability is 1000, the magnetic flux density during operation is 1.2T, the effective magnetic permeability cross-sectional area of the magnetic circuit 101 is 0.05m ² ; the magnetic coupling tube 103 is wound on the magnetic circuit 101, The number of turns of the magnetic coupling tube 103 is 36; the magnetic coupling tube 103 and the reaction chamber 104 serve as supports for the continuously flowing reaction medium. At this time, the magnetic coupling tube 103 is connected to the reaction chamber 104, and the cross section of the reaction chamber 104 The area is 0.36 cm ² and the cross-sectional area of the magnetic coupling tube 103 is 1 cm ^2. When the reaction medium with conductivity of 2.35 S/m (25° C., 0.2% HCl and 0.3% Na ₂ CO ₃ ) is pumped into the circulation reaction chamber At 104, the effective potential difference received is 3000V, the length of the reaction chamber 104 is 20cm, and the impedance is 2000Ω when the reaction medium fills the reaction chamber 104, so the induced current in the reaction chamber 104 is 1.5A and the induced current density It is 2.78A/cm ² ; the inlet 201 of the reaction medium is located in the middle of the magnetic coupling tube 103, and the outlet 202 of the reaction medium is located in the middle of the reaction chamber 104. When the flow rate is 3.2ml/min, the retention time of the reaction medium confluence of each branch through the reaction chamber 104 is 135s, which is tested by an infrared thermal imager. After the reaction medium at room temperature of 25°C continuously passes through the induction thermal reactor I, The temperature of the outgoing reaction medium rose to 93.7°C.

Example 2

The continuous induction thermal reactor II, as shown in FIG. 2, includes a magnetic circuit 101, a primary coil 102, a magnetic coupling tube 103, and a reaction chamber 104;

Among them, the primary coil 102 is wound on the magnetic circuit 101, the number of turns of the primary coil 102 is 12 turns, the 2000V voltage is applied to the primary coil 102 by the power supply, the magnetic flux in the magnetic circuit 101 is 0.12Wb, at this time, the conduction of the magnetic circuit 101 The magnetic material is cobalt-based amorphous, the initial relative permeability is 35000, the magnetic flux density during operation is 0.8T, the effective magnetic permeability cross-sectional area of the magnetic circuit 101 is 0.15m ² ; the magnetic coupling tube 103 is wound on the magnetic circuit 101 , The number of turns of the magnetic coupling tube 103 is 48; the magnetic coupling tube 103 and the reaction chamber 104 serve as supports for the continuously flowing reaction medium. At this time, the magnetic coupling tube 103 is connected to the reaction chamber 104, and the reaction chamber 104 The cross-sectional area is 0.16 cm ² and the cross-sectional area of the magnetic coupling tube 103 is 2.3 cm ^2. When the reaction medium with conductivity of 3.47 S/m (25° C., 0.6% NaOH and 0.2% KCl) is pumped into the circulation reaction chamber 104 , The effective potential difference received is 8000V, the length of the reaction chamber 104 is 10cm, and the impedance is 1600Ω when the reaction medium fills the reaction chamber 104, so the induced current in the reaction chamber 104 is 5A, and the induced current density is 31.25 A/cm ² ; the inlet 201 of the reaction medium is located in the middle of the magnetic coupling tube 103, and the outlet 202 of the reaction medium is located in the middle of the reaction chamber 104. When the flow rate is 10ml/min, the retention time of the reaction medium confluence of each branch through the reaction chamber 104 is 10s, which is tested by an infrared thermal imager. The reaction medium at room temperature of 25°C flows out after continuously passing through the induction thermal reactor II The temperature of the reaction medium rose to 96.5°C.

Example 3

The continuous induction thermal reactor III, as shown in FIG. 3, includes a magnetic circuit 101, a primary coil 102, a magnetic coupling tube 103, and a reaction chamber 104;

Among them, the primary coil 102 is wound on the magnetic circuit 101, the number of turns of the primary coil 102 is 8 turns, a voltage of 1800V is applied to the primary coil 102 by the power supply, the magnetic flux in the magnetic circuit 101 is 0.32Wb, at this time, the conduction of the magnetic circuit 101 The magnetic material is iron-based nanocrystals, the initial relative permeability is 90000, the magnetic flux density during operation is 1.6T, the effective magnetic permeability cross-sectional area of the magnetic circuit 101 is 0.20m ² ; the magnetic coupling tube 103 is wound on the magnetic circuit 101 , The number of turns of the magnetic coupling tube 103 is 40; the magnetic coupling tube 103 and the reaction chamber 104 serve as supports for the continuously flowing reaction medium. At this time, the magnetic coupling tube 103 is connected to the reaction chamber 104, and the reaction chamber 104 The cross-sectional area is 0.5 cm ² and the cross-sectional area of the magnetic coupling tube 103 is 3.6 cm ^2. When the reaction medium with conductivity of 0.28 S/m (25°C, 0.1% HNO ₃ and 0.1% NaCl) is pumped into the circulation reaction chamber At 104 hours, the effective potential difference received is 9000V, the length of the reaction chamber 104 is 25cm, and the impedance is 15000Ω when the reaction medium fills the reaction chamber 104, so the induced current in the reaction chamber 104 is 0.6A and the induced current density It is 1.2A/cm ² ; the inlet 201 of the reaction medium is located in the middle of the magnetic coupling tube 103, and the outlet 202 of the reaction medium is located in the middle of the magnetic coupling tube 103. When the flow rate is 10ml/min, the retention time of the confluence of the reaction medium of each branch through the reaction chamber 104 is 75s, which is tested by an infrared thermal imager. The reaction medium at room temperature of 25°C flows out after continuously passing through the induction thermal reactor III The temperature of the reaction medium rose to 72.8°C.

The continuous induction thermal reactor provided by the invention enables the material with low permeability or the reaction medium to quickly generate heat by using an alternating magnetic field and a reasonable circuit structure design; and by setting the inlet and outlet to the magnetic field The central position of the coupling tube or reaction chamber ensures that the continuous flow materials or reaction media of each branch stay in the reaction chamber for the same time. The samples can be processed continuously through the reaction chamber at one time. For large batches of continuous flow materials Or when the reaction medium is processed, the thermal reaction process of all continuous flow materials or reaction medium can be completed continuously without manual intervention. The induction thermal reactor does not use any metal plates and electrodes for heating the sample, has no external heat source and radiation, is green and efficient, and is suitable for continuous processing.

Although the present invention has been described in detail with reference to the foregoing embodiments, for those skilled in the art, it can still modify the technical solutions described in the foregoing embodiments, or equivalently replace some of the technical features therein. Within the spirit and principle of the present invention, any modifications, equivalent replacements, improvements, etc., shall be included in the protection scope of the present invention. Although the present invention has been disclosed as the preferred embodiments above, it is not intended to limit the present invention. Anyone familiar with this technology can make various changes and modifications without departing from the spirit and scope of the present invention. The protection scope of the present invention shall be defined by the claims.

Claims (10)

1. The continuous induction thermal reactor is characterized by comprising: a magnetic circuit, a primary coil, a magnetic coupling tube, and a reaction chamber;

   Among them, the sample inlet and the sample outlet are set at the center of the magnetic coupling tube or the reaction chamber, and the continuous flow of materials or reaction medium passes through the reaction chamber at one time to complete the continuous processing;

   The magnetic circuit is composed of a magnetically conductive material. The primary coil and the magnetic coupling tube are wound around the magnetic circuit. The magnetic coupling tube is connected to the reaction chamber. The continuous induction thermal reactor includes at least one magnetic coupling tube and at least one reaction chamber.
2. The continuous induction thermal reactor according to claim 1, wherein the inner diameter of the reaction chamber is smaller than the inner diameter of the magnetic coupling tube.
3. The continuous induction thermal reactor according to claim 1, wherein the ratio of the cross-sectional area of the reaction chamber to the cross-sectional area of the magnetic coupling tube is 1:1.3 to 1:50.
4. The continuous induction thermal reactor according to claim 1, wherein after the power source applies a voltage to the primary coil, the total magnetic flux carried in the magnetic circuit is in the range of 0-10Wb, and the initial magnetic permeability of the magnetic circuit is 800-90000 .
5. The continuous induction thermal reactor according to claim 1, characterized in that the instantaneous induced voltages at both ends of the reaction chamber have opposite polarities, and the induced current density in the reaction chamber is 1-80A/cm ² .
6. The continuous induction thermal reactor according to claim 1, characterized in that the induction current loop exists only between the magnetic coupling tube and the reaction chamber, and the sample inlet and the sample outlet have no leakage and are used for open continuous Stream processing.
7. The continuous induction thermal reactor according to claim 1, wherein the reaction chamber and the magnetic coupling tube have electrical insulation.
8. A heating device, characterized in that the heating device adopts the continuous induction heat reactor according to any one of claims 1-7, and the heating device heats a substance with a conductivity in the range of 0.1-40 S/m .
9. The heating device according to claim 8, wherein the substance is a flowable substance.
10. Use of the continuous induction thermal reactor according to any one of claims 1-7 and/or the heating device according to any one of claims 8-9 in the fields of chemical industry, food and environment.

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