CN113645818A

CN113645818A - Clamping device for eliminating charges in circulating water by permanent magnet and Faraday cage

Info

Publication number: CN113645818A
Application number: CN202111089476.3A
Authority: CN
Inventors: 罗勇芬; 刘牟瀚宇; 王国利; 罗兵; 王婷婷; 廖一帆; 贾磊
Original assignee: Xian Jiaotong University; CSG Electric Power Research Institute
Current assignee: Xian Jiaotong University; CSG Electric Power Research Institute
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2021-11-12
Anticipated expiration: 2041-09-16
Also published as: CN113645818B

Abstract

The invention discloses a clamping device for eliminating charges in circulating water by a permanent magnet and a Faraday cage, which comprises a permanent magnet pole, the Faraday cage, a water pipe and a fixing device, wherein the permanent magnet pole is arranged on the Faraday cage; the permanent magnet pole is connected to the ground potential, the Faraday cage is connected to the ground potential through the battery, and the Faraday cage plays a role in potential clamping on the device and circulating water inside the device; when the converter valve works, the valve is in an open state, circulating water flows into an action area of an external magnetic field, Lorentz force generated by the magnetic field on charged particles in water enables the charged particles to deflect, the deflected charged particles deflect towards an action area of the electric field, and then positive and negative ions enter a Faraday cage under the action of the electric field, are collected by the Faraday cage and enter a battery loop for neutralization; when the converter valve does not work, the valve is closed, the flange is unscrewed, and the Faraday cage can be replaced. The problem of the corrosion of electric particles to converter valve and water cooling system is solved, the influence to electric power system is little, the reliability is high, when changing the electrode, only need to change Faraday cage can.

Description

Clamping device for eliminating charges in circulating water by permanent magnet and Faraday cage

Technical Field

The invention belongs to the field of direct current transmission, and relates to a clamping device for eliminating charges in circulating water by a permanent magnet and a Faraday cage.

Background

Due to regional differences between energy distribution and power requirements, direct current transmission is a good way to meet large-capacity and long-distance transmission, and meanwhile, in order to save cost for replacing a converter valve of a power grid and safely operate, a device for treating charged particles in circulating water needs to be researched urgently.

The converter valve is a vital device in the direct current transmission project, and plays an important role in mutual conversion of direct current and alternating current in the direct current transmission process. However, during normal conversion, the power electronics of the converter valve generate a lot of heat due to switching losses etc. In order to reduce the operating temperature of the converter valve, the converter valve is provided with an auxiliary system, namely a water circulation cooling system, so as to control the temperature of water entering and exiting the converter valve within a reasonable range, and the converter valve is ensured to normally work. The electric and water-cooling circuits which run simultaneously exist in a valve hall of the converter valve, the inner cooling water circuit connects power electronic devices (such as a thyristor or an IGBT) with different potentials in a valve tower of the converter valve, radiating fins, a water-cooling resistor and a water-cooling reactor, and cellulose and lignin are chemically composed of most solid insulating materials, wherein the cellulose has hydroxyl groups, and the lignin has hydroxyl groups, aldehyde groups and carboxyl groups. The liquid is rubbed with these insulating media under constant flow, so that the electron cloud in the radicals is deflected, the cellulose and lignin molecules are covered by positive charges, and the insulating surface is just like a layer of hydrogen atoms with positive polarity. The positive particles have a strong affinity for the negative ions in the liquid, and adsorb the negative ions in the liquid, thereby forming a charged layer on the insulating interface. When the flow velocity of the liquid reaches a certain value, the charges of the charged layer are separated, the negative charge particles stay on the surface of the medium, and the positive charges flow along with the liquid. Meanwhile, different parts of the converter valve have potential differences, so that an electric field is formed in a water cooling system, and negative ions on the inner surface of the medium are separated from the water and enter the water. When the liquid further flows and reaches a certain degree, negatively charged particles on the surface of the medium are discharged to the medium due to overlarge concentration, so that oil flow is charged, and further safety accidents are caused.

Therefore, to ensure that the potentials of all points of a circulating water loop and the corresponding positions of valves are arranged in an equipotential manner, a clamping electrode needs to be additionally arranged, but the electrode can absorb electric charges in water and generate corrosion. However, in actual production and operation, because corrosion of power electronic devices, such as thyristors or IGBT radiators and other metal parts cannot be completely avoided, severe dirt is generated on the platinum metal electrode, and the dirt can cause corrosion damage of the threads of the platinum metal electrode, even the platinum metal electrode is separated from the probe, so that the platinum metal electrode is damaged, and the main reason that water leakage is caused by the sealing failure on a main water pipeline is that the threads of the platinum metal electrode base are corroded and damaged; the separation of the platinum metal electrode base and the probe can cause the potential on the main water pipe to suspend, which causes partial discharge and further accelerates the scaling of the platinum metal electrode. Current countermeasure is for having a power failure to overhaul the scale removal, but, ascends a height and overhauls and can produce a large amount of maintenance cost, spends a large amount of manpower and materials, ascends a height simultaneously and overhauls and also bring the personal safety risk. Most of the current electrodes are platinum metal electrodes, and the traditional electrode replacement method is to replace the whole platinum electrode, so that the cost is increased.

Disclosure of Invention

The invention aims to solve the problems in the prior art and provides a clamping device for eliminating charges in circulating water by using a permanent magnet and a Faraday cage, which has the advantages of reasonable design, easy realization, and a plurality of advantages compared with the traditional method and device, and has the advantages of effective cost reduction when the converter valve is integrally replaced, small influence of the whole device on an electric power system, high reliability and good practical value.

In order to achieve the purpose, the invention adopts the following technical scheme to realize the purpose:

a clamping device for eliminating charges in circulating water by a permanent magnet and a Faraday cage comprises a permanent magnet and a water pipe;

the permanent magnet comprises an N pole and an S pole of an external magnetic field, the N pole and the S pole are arranged on two sides of the main water pipe, are mutually symmetrical in position and are connected to a local potential;

the water pipe comprises a main water pipe, a first water pipe and a second water pipe, one end of the first water pipe is communicated with one side of the main water pipe, the other end of the first water pipe is provided with a first flange, a first Faraday cage is arranged on one side, close to the first flange, in the first water pipe, and a first valve is arranged between the first Faraday cage and the main water pipe; one end of the second water pipe is communicated with the other side of the main water pipe, a second flange is installed at the other end of the second water pipe, a second Faraday cage is installed on one side, close to the second flange, inside the second water pipe, and a second valve is installed between the second Faraday cage and the main water pipe.

The invention is further improved in that:

the first and second faraday cages are connected to a ground potential via first and second batteries, respectively.

The first Faraday cage is located between the first flange and the first valve, the second Faraday cage is located between the second flange and the second valve, the positions of the first Faraday cage and the second Faraday cage are symmetrical, the first Faraday cage collects positively charged particles, and the second Faraday cage collects negatively charged particles.

The battery includes a first battery connected between the first faraday cage and a ground potential and a second battery connected between the second faraday cage and the ground potential to neutralize charged particles collected by the first and second faraday cages.

The first Faraday cage and the second Faraday cage are made of metal materials.

The first water pipe and the second water pipe are symmetrical with each other on the same axis with respect to the main water pipe.

The first valve comprises a valve and a control device for controlling whether negatively charged ions pass through, and the second valve comprises a valve and a control device for controlling whether positively charged ions pass through.

The direction of the external magnetic field is vertical to the axial direction of the first water pipe and the second water pipe.

Compared with the prior art, the invention has the following beneficial effects:

the invention provides a clamping device for eliminating charges in circulating water by a permanent magnet and a Faraday cage, which can be used in occasions needing to cool a converter valve. When the converter valve and the circulating water cooling system work, the valve is opened, and when circulating water flows through an external magnetic field, charged particles in the water deflect under the action of Lorentz force and then enter the Faraday cage to be limited and collected.

Furthermore, the invention is provided with two batteries which are connected in series, the common point of the middle potential of the batteries is connected with two magnetic poles and is connected to the local potential of the converter valve, the other two connection points of the two batteries are respectively connected with a Faraday cage, and the charge in the Faraday cage enters a battery loop to be neutralized.

The device can inhibit discharge in circulating water and reduce corrosion of charged particles to a converter valve and a water cooling system, has small influence on an electric power system and high reliability, and only needs to replace a Faraday cage when an electrode is replaced, wherein the Faraday cage is made of common metal, and compared with a platinum electrode, the cost is greatly saved.

Drawings

In order to more clearly explain the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.

FIG. 1 is a schematic diagram of the practical function of the present invention;

FIG. 2 is a schematic structural view of the present invention;

wherein: 1-N pole, 2-S pole, 3-first Faraday cage, 4-second Faraday cage, 5-first water pipe, 6-second water pipe, 7-first valve, 8-second valve, 9-first battery, 10-second battery, 11-first flange, 12-second flange, 13-ground potential, 14-main water pipe, and 15-magnetic field action area.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.

Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the embodiments of the present invention, it should be noted that if the terms "upper", "lower", "horizontal", "inner", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the present invention is used, the description is merely for convenience and simplicity, and the indication or suggestion that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus, cannot be understood as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance.

Furthermore, the term "horizontal", if present, does not mean that the component is required to be absolutely horizontal, but may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.

In the description of the embodiments of the present invention, it should be further noted that unless otherwise explicitly stated or limited, the terms "disposed," "mounted," "connected," and "connected" should be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The invention is described in further detail below with reference to the accompanying drawings:

referring to fig. 1 and 2, the clamping device for eliminating charges in circulating water by using the permanent magnet and the faraday cage of the present invention comprises the permanent magnet, the faraday cage, a control and fixing device and a battery;

the permanent magnet comprises an N pole 1 and an S pole 2 of an external magnetic field, and the Faraday cage comprises a first Faraday cage 3 and a second Faraday cage 4; the water pipe comprises a first water pipe 5 and a second water pipe 6, the valve comprises a first valve 7 and a second valve 8, and a first flange 11 and a second flange 12 of the flange; the battery comprises a first battery 9 and a second battery 10, and the following steps are provided for solving the practical problems in the implementation of the invention:

the method comprises the following steps: the device is arranged on a main water pipe 14 in a converter valve circulating water system, and at the moment, a magnetic field action area 15 formed by the N pole 1 and the S pole 2 is vertically intersected with the main water pipe 14; the first water pipe 5 and the second water pipe 6, wherein one end of the first water pipe 5 is communicated with one side of the main water pipe 14, the tail end of the other end of the first water pipe is provided with a first flange 11, a first Faraday cage 3 is arranged inside the first water pipe, and a first valve 7 is arranged between the first Faraday cage 3 and the main water pipe 14; the second water pipe 6 and the first water pipe 5 are mutually symmetrical on the same axis, and a second valve 8, a second Faraday cage 4 and a second flange 12 are sequentially and symmetrically arranged from the side close to the main water pipe 14. When the device is installed, two groups of first batteries 9 and second batteries 10 are respectively connected between the Faraday cages and the electrodes on two sides to ensure the potential distribution when the valve and the flange are both in a closed state.

Step two: when the device normally works, the N pole 1 and the S pole 2 of the permanent magnet pole are connected to the ground potential 13, and the first Faraday cage 3 and the second Faraday cage 4 are connected to the ground potential 13 through the first battery 9 and the second battery 10, so that the potential clamping effect is realized on the device and circulating water inside the device. When the converter valve works, the valve comprises a first valve 7 and a second valve 8 which are in an open state; circulating water flows into the magnetic field action area 15, Lorentz force is generated on charged particles in the water by the magnetic field formed by the N pole 1 and the S pole 2, the charged particles are subjected to the action of the Lorentz force in the electromagnetic field, and the requirement of meeting the requirement

Is the lorentz force, q is the amount of charge,

is the velocity of the charged particles and,

is magnetic induction intensity, and the deflection radius of the charged particles in a magnetic field satisfies R ═ mv/Bq.

The deflected positive ions and negative ions are deflected towards the second flange and the first flange respectively, then the positive ions and the negative ions enter the Faraday cage under the action of an electric field in the Faraday cage, the electron energy reaching the Faraday cage is w which is qU, and at the moment, the movement of charged particles in the electric field is collected by the Faraday cage and enters a circuit loop of the battery for neutralization.

Step three: when the converter valve does not work, the first valve 7 and the second valve 8 are closed, the first flange 11 and the second flange 12 are unscrewed, and the first Faraday cage 3 and the second Faraday cage 4 can be replaced.

Step four: when the device needs to be maintained, the part needing maintenance is mainly a Faraday cage; the Faraday cage is made of common metal, compared with expensive platinum metal, the cost is greatly saved, and the maintenance cost is greatly reduced.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A clamping device for eliminating charges in circulating water by a permanent magnet and a Faraday cage is characterized by comprising a permanent magnet and a water pipe;

the permanent magnet comprises an N pole (1) and an S pole (2) of an external magnetic field, the N pole (1) and the S pole (2) are arranged on two sides of the main water pipe (14), are symmetrical in position and are connected to a local potential (13);

the water pipe comprises a main water pipe (14), a first water pipe (5) and a second water pipe (6), one end of the first water pipe (5) is communicated with one side of the main water pipe (14), the other end of the first water pipe is provided with a first flange (11), a first Faraday cage (3) is arranged on one side, close to the first flange (11), in the first water pipe (5), and a first valve (7) is arranged between the first Faraday cage (3) and the main water pipe (14); one end of the second water pipe (6) is communicated with the other side of the main water pipe (14), the other end of the second water pipe is provided with a second flange (12), the second Faraday cage (4) is arranged on one side, close to the second flange (12), inside the second water pipe (6), and the second valve (8) is arranged between the second Faraday cage (4) and the main water pipe (14).

2. Clamping device for permanent magnet and faraday cage elimination of electric charges in circulating water according to claim 1, characterized in that the first faraday cage (3) and the second faraday cage (4) are connected to a ground potential (13) by a first battery (9) and a second battery (10), respectively.

3. Clamping device for permanent magnet and faraday cage elimination of charges in circulating water according to claim 1, characterized in that the first faraday cage (3) is located between the first flange (11) and the first valve (7) and the second faraday cage (4) is located between the second flange (12) and the second valve (8) symmetrically positioned with respect to each other, wherein the first faraday cage (3) collects positively charged particles and the second faraday cage (4) collects negatively charged particles.

4. The permanent magnet and faraday cage clamp for eliminating charge from circulating water according to claim 2, wherein said batteries comprise a first battery (9) and a second battery (10), the first battery (9) being connected between the first faraday cage (3) and the ground potential (13), the second battery (10) being connected between the second faraday cage (4) and the ground potential (13), neutralizing the charged particles collected by the first faraday cage (3) and the second faraday cage (4).

5. Clamping device for permanent magnet and faraday cage elimination of electric charges in circulating water according to claim 1, 2 or 3, characterized in that the first faraday cage (3) and the second faraday cage (4) are of metal.

6. The permanent magnet and faraday cage clamp for removing charges from circulating water of claim 1, wherein said first (5) and second (6) water tubes are symmetrical to each other on the same axis with respect to the main water tube (14).

7. The permanent magnet and faraday cage clamp for removing charge from circulating water of claim 1, wherein the first valve (7) comprises a valve and control means for controlling the passage of negatively charged ions and the second valve (8) comprises a valve and control means for controlling the passage of positively charged ions.

8. The permanent magnet and faraday cage clamp for removing charges from circulating water of claim 1, wherein the direction of said externally applied magnetic field is perpendicular to the axial direction of the first (5) and second (6) water tubes.