CN111151182A - Method and device for driving and transporting low-conductivity liquid by using high-frequency traveling wave magnetic field - Google Patents
Method and device for driving and transporting low-conductivity liquid by using high-frequency traveling wave magnetic field Download PDFInfo
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- CN111151182A CN111151182A CN201811312228.9A CN201811312228A CN111151182A CN 111151182 A CN111151182 A CN 111151182A CN 201811312228 A CN201811312228 A CN 201811312228A CN 111151182 A CN111151182 A CN 111151182A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F33/00—Other mixers; Mixing plants; Combinations of mixers
- B01F33/45—Magnetic mixers; Mixers with magnetically driven stirrers
- B01F33/451—Magnetic mixers; Mixers with magnetically driven stirrers wherein the mixture is directly exposed to an electromagnetic field without use of a stirrer, e.g. for material comprising ferromagnetic particles or for molten metal
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Abstract
The invention discloses a method and a device for driving and transporting low-conductivity liquid by using a high-frequency traveling wave magnetic field. Three inductors are wound around the wall of the low conductivity liquid container in a specific manner, wherein a high frequency current is conducted in one of the inductors and a high frequency current is induced in the latter two inductors. The high frequency current generates a traveling magnetic field around the inductive coil, and this changing magnetic field interacts with eddy currents induced in the low conductivity liquid to generate lorentz forces that drive the low conductivity liquid. The invention provides a non-contact stirring method, which can stir low-conductivity liquid without placing a stirring paddle in a container.
Description
Technical Field
The invention relates to a method and a device for driving and transporting low-conductivity liquid by utilizing a high-frequency traveling wave magnetic field, which can realize non-contact stirring of the low-conductivity liquid and belongs to the fields of chemistry and chemical engineering, hydromechanics, engineering thermophysics, material engineering, resource environment and the like.
Background
The existing method for stirring low-conductivity liquid is to stretch stirring paddles or put magnetons and the like into a container for mechanical stirring, and the mechanical stirring is in a contact type and is not suitable for high-temperature, high-pressure and strong-corrosivity environments. The strain rate of the fluid near the mechanical stirring blade is very large, the stirring intensity distribution is not uniform, and the stirring area is limited near the stirring blade.
Disclosure of Invention
The invention aims to provide a device and a method for non-contact stirring of low-conductivity liquid aiming at the defect of direct contact of the existing mechanical stirring technology. The schematic of the travelling wave magnetic field is shown in figure 1. The phase speed c of the travelling wave magnetic field is f multiplied by L, wherein L is the polar distance, f is the frequency, and the frequency f of the high-frequency travelling wave magnetic field is in the order of hundreds of kilohertz and is far greater than the power frequency (50Hz) of the liquid metal electromagnetic stirring. Under the condition of the same polar distance, the phase speed of the high-frequency traveling wave magnetic field is far greater than that of a liquid metal electromagnetic pump, the traveling wave magnetic field has remarkable movement, and considerable eddy current can be formed in low-conductivity liquid.
The device for stirring the low-conductivity liquid by the high-frequency traveling wave magnetic field comprises three inductance coil devices which are wound in a specific sequence and have a specific position structure. High-frequency current is conducted in the driving phase coil, an induced magnetic field generated by the driving phase coil links the upper induction phase coil and the lower induction phase coil, and induced current is generated in the induction phase coils. The overall circuit diagram of the device is shown in fig. 2, and the winding method diagram of the inductance coil is shown in fig. 3. The schematic diagram of the placement method is shown in fig. 4, where the triangle symbol represents the driving phase, and the circle symbol and the square symbol represent the two sensing phases, respectively. The solid symbols indicate that the winding direction is out of the plane of the paper, and the dotted symbols in the middle indicate that the winding direction is in the plane of the paper.
And an inductance coil L1 which is connected with a resistor R1 and a capacitor C1 in series, wherein a high-frequency power supply is connected in parallel at two ends of the capacitor, and the inductance coil is a driving phase.
The inductance coil L2 is connected with the resistor R2 and the capacitor C2 in series to form a passive loop, and the inductance coil is an induction phase;
the inductance coil L3 is connected with the resistor R3 and the capacitor C3 in series to form a passive loop, and the inductance coil is an induction phase;
the virtual coil 1, the virtual coil 2 and the virtual coil 3 are respectively induced eddy currents of the driving phase, the induction phase 1 and the induction phase 2 in the low-conductivity liquid, the resistance value of the induced eddy currents is Rc, and the self-inductance value is Lc.
K1 is the mutual inductance generated by the mutual interlinkage of the driving phase and the induction phase 1, and the 6 coils are interlinked in pairs to generate 15 mutual inductances in total.
The invention provides a device for stirring low-conductivity liquid in a non-contact way by using a high-frequency traveling wave magnetic field, wherein the frequency of a high-frequency power supply is 100-400 kHz, the specific working frequency of the high-frequency power supply is determined by the equivalent impedance of a loop, and the high-frequency power supply works at the resonance point of the loop.
The invention provides a device for stirring low-conductivity liquid by a high-frequency traveling wave magnetic field. Adjusting the position of the inductance coil will affect the mutual inductance value between the induction phase and the driving phase, further affect the amplitude and phase of the current in the induction phase, further affect the impedance of the whole loop, the resonance point of the system will change, further affect the working frequency of the system, and the phase difference range of the induction phase and the driving phase is 45-90 degrees.
The radius of the container used by the device for stirring the low-conductivity liquid in a non-contact way by using the high-frequency traveling wave magnetic field is smaller than the skin depth of the high-frequency traveling wave magnetic field in the low-conductivity liquid, so that the traveling wave magnetic field can effectively permeate into all the liquid in the container.
The device for stirring the low-conductivity liquid in the high-frequency traveling wave magnetic field in a non-contact way has the advantages that: non-contact stirring can be realized, and mechanical transmission parts such as stirring paddles and the like are not needed in the container. The stirring force is from the Lorentz force generated by the interaction of the changed magnetic field and the eddy current induced in the low-conductivity liquid, and the Lorentz force acts on the whole low-conductivity liquid.
Drawings
FIG. 1 schematic representation of a travelling-wave magnetic field
Fig. 2 is a schematic circuit diagram of the whole device.
FIG. 3 schematically illustrates a method of placing an inductor
Fig. 4 is a schematic diagram of a winding method of an inductance coil.
FIG. 5 flow diagram of liquid in vessel
Detailed Description
The invention provides a device and a method for stirring low-conductivity liquid by using a high-frequency traveling wave magnetic field. The device connection method is shown in figure 1, and the winding method and the placement method of the inductance coil are respectively shown in figure 2 and figure 3.
The coil in the device is formed by winding a copper pipe, water is filled in the middle for cooling, and the diameter of the coil is 1.5cm and can also be expanded to 1-3 cm. The coil is hollow, and the wall thickness is 2mm, also can adjust the wall thickness according to actual conditions. The three inductance coils are wound in the same way, and the self-inductance values are approximately the same. The capacitance can be flexibly adjusted according to the inductance value, and the range of the capacitance is
0.20μF～0.24μF。
The coil can be cooled by circulating water, and the temperature of the circulating water is not higher than 35 ℃.
The center positions of the three coils in the device are adjustable, wherein the driving phase is positioned in the middle, the two induction phases are respectively arranged at the upper side and the lower side, and the distances between the center lines of the two induction phases and the center lines of the driving phase are the same. And finely adjusting the position of the induction phase to ensure that the phase difference range of the induction phase and the driving phase current is 45-90 degrees, and the phase difference of the current can be measured by a Rogowski coil.
The container in the device of the invention needs to be made of insulating material and has the resistivity of 1010～1022Omega · m is generally glass, organic glass, plastic, etc., and the high-frequency traveling wave magnetic field can penetrate almost without loss. To facilitate flow observation, the container wall material may also use a transparent medium.
The low conductivity liquid stirred by the device of the invention can be saline solution, ionic liquid and the like. Conductive ions can be doped into the non-conductive solution, and the conductivity range is 0.1-100S/m. (claims)
The upper part of the coil of the device is wound by two turns, and the lower part of the coil is wound by two turns. In practice, N circles can be set according to the current and the requirement of the induced magnetic field, wherein N is more than or equal to 1 and less than or equal to 3.
The device of the invention can be used for stirring, conveying and driving. The device can be integrated into a conveying unit, and the conveying unit can be uniformly distributed on the pipeline at intervals for long-pipe-section conveying occasions.
Claims (9)
1. A method and apparatus for driving and transporting low-conductivity liquid by high-frequency travelling-wave magnetic field features that the non-contact stirring apparatus and method are used to drive the low-conductivity liquid by Lorentz force, which is a volume force generated by the interaction between high-frequency travelling-wave magnetic field and eddy current induced in the low-conductivity liquid. The high-frequency traveling wave magnetic field is derived from a high-frequency current conducted in one driving inductance coil and high-frequency currents induced in two induction inductance coils. The high-frequency traveling wave magnetic field has the frequency of 100 kHz-400 kHz, the skin depth can reach the decimeter level in low-conductivity liquid, the phase speed can reach the 100km/s level, and the magnetic field movement speed is obvious.
2. The device for stirring the low-conductivity liquid by the high-frequency traveling wave magnetic field according to claim 1, wherein mechanical transmission parts such as stirring paddles and the like are not arranged in the container, so that non-contact stirring can be realized, and the device is suitable for application occasions with high vacuum degree, high temperature and high pressure.
3. An apparatus for stirring a liquid with low conductivity by a high frequency traveling wave magnetic field according to claim 1, comprising three inductor devices wound in a specific order and structured in specific positions. Each inductance coil comprises an upper part and a lower part which are opposite in winding direction, and each part comprises 1-3 turns of coils. The three inductance coils are arranged in a staggered mode and surround the outer side of the container. The overall circuit diagram of the device is shown in fig. 2, the winding method diagram of the inductance coil is shown in fig. 3, the placing method diagram is shown in fig. 4, and the device comprises:
s1, an inductance coil L1, a resistor R1 and a capacitor C1 which are connected in series, and a high-frequency power supply is connected in parallel at two ends of the capacitor;
s2, an inductance coil L2, a resistor R2 and a capacitor C2 are connected in series to form a passive loop;
s3, an inductance coil L3, a resistor R3 and a capacitor C3 are connected in series to form a passive loop;
s4, a dotted line ring 1, a dotted line ring 2 and a dotted line ring 3 are respectively induced eddy currents of the driving phase, the induction phase 1 and the induction phase 2 in the low-conductivity liquid, the resistance value of the induced eddy currents is Rc, and the self-inductance value is Lc;
s5 and K1 are mutual inductances generated by mutual interlinkage of the driving phase and the induction phase 1, and the 6 coils are interlinked pairwise to generate 15 mutual inductances in total.
4. The device for stirring the low-conductivity liquid by the high-frequency traveling wave magnetic field according to claim 1, wherein the power supply is a high-frequency power supply, the frequency is 100 kHz-400 kHz, and the specific working frequency point can be changed according to the equivalent impedance value of an external circuit.
5. The apparatus for stirring a low conductivity liquid with a high frequency traveling wave magnetic field according to claim l, wherein the center positions of the three inductors are adjustable up and down. The mutual inductance value between the induction phase and the driving phase is influenced by adjusting the position of the inductance coil, so that the amplitude and the phase of current in the induction phase are further influenced, the phase difference range of the induction phase and the driving phase is 45-90 degrees, and the amplitude range is 0.5-2 degrees.
6. The coil in the device is formed by winding a copper pipe, water is filled in the middle for cooling, and the diameter of the coil is 1.5cm and can also be expanded to 1-3 cm. The coil is hollow, and the wall thickness is 2mm, also can adjust the wall thickness according to actual conditions. The three inductance coils are wound in the same way, and the self-inductance values are approximately the same. The capacitance value can be flexibly adjusted according to the inductance value, and the capacitance value range is 0.20 muF-0.24 muF.
7. An apparatus for agitating a low conductivity liquid using a high frequency traveling wave magnetic field according to claim 1, wherein the low conductivity liquid to be agitated is a saline solution, an ionic liquid, or the like. For the non-conductive solution, conductive liquid can be doped, and the conductivity range is 0.1-100S/m.
8. Device for stirring liquids of low conductivity with a magnetic field of high frequency travelling waves according to claim 1, characterized in that a flow of the order of cm/s or even more is achieved.
9. The device of the invention can be used for stirring, conveying and driving. The device can be integrated into a conveying unit, and the conveying unit can be uniformly distributed on the pipeline at intervals for long-pipe-section conveying occasions.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811312228.9A CN111151182A (en) | 2018-11-07 | 2018-11-07 | Method and device for driving and transporting low-conductivity liquid by using high-frequency traveling wave magnetic field |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811312228.9A CN111151182A (en) | 2018-11-07 | 2018-11-07 | Method and device for driving and transporting low-conductivity liquid by using high-frequency traveling wave magnetic field |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114100392A (en) * | 2021-11-15 | 2022-03-01 | 郝建强 | Preparation method of non-contact hydrogen fuel cell cooling liquid |
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|---|---|---|---|---|
| CN1449313A (en) * | 2000-06-27 | 2003-10-15 | Abb股份有限公司 | Method and device for continuous casting of metals in a mold |
| CN101491824A (en) * | 2009-02-25 | 2009-07-29 | 杨吉林 | Upper continuous casting electromagnetic stirring device |
| US20100163207A1 (en) * | 2007-08-03 | 2010-07-01 | Forschungszentrum Dresden-Rossendorf E. V. | Method and device for the electromagnetic stirring of electrically conductive fluids |
| CN102071469A (en) * | 2011-01-13 | 2011-05-25 | 西北工业大学 | Directional solidification device with traveling-wave magnetic field generator |
| CN104096813A (en) * | 2013-04-12 | 2014-10-15 | 宝山钢铁股份有限公司 | Magnetic field generator and electromagnetic stirring device adopting magnetic field generator |
-
2018
- 2018-11-07 CN CN201811312228.9A patent/CN111151182A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1449313A (en) * | 2000-06-27 | 2003-10-15 | Abb股份有限公司 | Method and device for continuous casting of metals in a mold |
| US20100163207A1 (en) * | 2007-08-03 | 2010-07-01 | Forschungszentrum Dresden-Rossendorf E. V. | Method and device for the electromagnetic stirring of electrically conductive fluids |
| CN101491824A (en) * | 2009-02-25 | 2009-07-29 | 杨吉林 | Upper continuous casting electromagnetic stirring device |
| CN102071469A (en) * | 2011-01-13 | 2011-05-25 | 西北工业大学 | Directional solidification device with traveling-wave magnetic field generator |
| CN104096813A (en) * | 2013-04-12 | 2014-10-15 | 宝山钢铁股份有限公司 | Magnetic field generator and electromagnetic stirring device adopting magnetic field generator |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114100392A (en) * | 2021-11-15 | 2022-03-01 | 郝建强 | Preparation method of non-contact hydrogen fuel cell cooling liquid |
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