CN103826379B - Nonequilibrium plasma generation device and particulate powder surface modification treatment system - Google Patents

Abstract

The invention discloses an unbalanced plasma generating device and a granular powder surface modification treatment system, which include a cavity, a shielding net, and a high-voltage electrode unit and a low-voltage electrode unit arranged in the cavity; the high-voltage electrode unit is arranged on the high-voltage electrode insulation On the lower surface of the cover plate, the high-voltage electrode unit includes a plurality of high-voltage line electrodes arranged in a uniform array, and a plurality of first through holes arranged in a uniform array are arranged on the high-voltage electrode insulating cover plate; one end of each high-voltage line electrode is connected to the lead wire of the high-voltage electrode One end of the high-voltage wire electrode is fixed; the other end of the high-voltage wire electrode is fixed by the high-voltage electrode fixing bolt, and the other end of the high-voltage electrode lead is drawn out through the first through hole; and each high-voltage electrode lead is connected as the pulse high-voltage input end of the unbalanced plasma generating device. The invention adopts the high-voltage nanosecond repetition frequency pulse to directly drive the non-equilibrium plasma in the air under the atmospheric pressure, the discharge peak current density is higher, the efficiency of generating active particles is better, and the non-equilibrium of the plasma is also higher.

Description

Non-equilibrium plasma generation device and granular powder surface modification treatment system

technical field

The invention belongs to the field of gas discharge and plasma application, and relates to a non-equilibrium plasma generating device and a granular powder surface modification treatment system.

Background technique

In recent years, atmospheric pressure air non-equilibrium plasma has received special attention due to its unique advantages and huge application prospects. Non-thermal equilibrium plasma is a partially ionized low-temperature plasma in which the electron and ion temperatures differ greatly. This kind of plasma contains a large number of active particles such as electrons, metastable ions, and free radicals, and has strong reactivity, so it has application prospects in many fields such as energy, materials, mechanical processing, and environmental protection. One of the most important research directions is the application exploration for surface modification of materials. Most of the non-equilibrium plasma used in the treatment of materials focuses on the treatment of macroscopic finished products such as thin films. As an intermediate material with wider and special uses than macroscopic finished products, the research on surface modification treatment of granular powder is relatively limited. less. Granular powder materials have a much larger contact area with the gas than films or similar materials. Therefore, the surface morphology and structure of the powder after plasma treatment, and even the particle size may change significantly.

At present, the relatively mature methods for generating non-equilibrium plasma in atmospheric pressure air are dielectric barrier discharge and corona discharge, such as CN101838800.B. Due to the existence of insulating medium, the distance of the discharge gap is generally relatively small in dielectric barrier discharge, which affects the structural expansion and practical application of the discharge electrode. In addition, the dielectric barrier layer may change its properties and cause pollution during use, and its material properties may also affect the discharge. Reaction affects. The disadvantage of corona discharge is that the ionization of the gas is mainly concentrated near the electrode, it is difficult to obtain a large volume of plasma in the entire space atmosphere, and the plasma ionization efficiency is limited, and the energy of the generated electrons is not high, so it is difficult to apply large-scale industrial production. Therefore, low-cost and continuous generation of large-area or large-volume non-thermal equilibrium plasma in the natural environment of normal temperature and atmospheric pressure air is of great significance for the industrial application of plasma.

Contents of the invention

Aiming at the defects of the prior art, the present invention provides a non-equilibrium plasma generating device, the purpose of which is to solve the problems existing in the existing plasma discharge forms that it is difficult to obtain a large volume of plasma, the energy utilization efficiency is low, and the discharge peak current density is small. , Low efficiency of generating active particles, poor plasma imbalance, large use restrictions, high application cost and other technical problems.

The invention provides an unbalanced plasma generating device, which includes a cavity, a shielding net, and a high-voltage electrode unit and a low-voltage electrode unit arranged in the cavity; the two opposite surfaces of the cavity are used as high-voltage electrode insulating cover plates and The low-voltage electrode insulation cover plate, the two opposite sides are used as shielding nets, and the other two opposite sides are used as sealing insulation plates; the high-voltage electrode unit is arranged on the lower surface of the high-voltage electrode insulation cover plate, and the high-voltage electrode unit includes A plurality of high-voltage line electrodes arranged in a uniform array, a plurality of first through holes arranged in a uniform array are arranged on the insulating cover plate of the high-voltage electrodes; one end of each high-voltage line electrode is fixed to one end of the lead wire of the high-voltage electrode; The other end of the high-voltage wire electrode is fixed by the high-voltage electrode fixing bolt, and the other end of the high-voltage electrode lead is drawn out through the first through hole; and each high-voltage electrode lead is connected as the pulse of the unbalanced plasma generating device. High-voltage input terminal; the low-voltage electrode unit is arranged on the lower surface of the low-voltage electrode insulating cover plate, and the low-voltage electrode unit includes a plurality of low-voltage line electrodes arranged in a uniform array; the low-voltage electrode insulating cover plate is provided with A plurality of second through holes arranged in a uniform array; one end of each low-voltage line electrode is fixed to one end of the low-voltage electrode lead; the other end of the low-voltage line electrode is fixed by the low-voltage electrode fixing bolt, and the low-voltage electrode lead The other end of the electrode is led out through the second through hole; and each low-voltage electrode lead is connected to the ground.

Wherein, the structure of the high voltage line electrode and the low voltage line electrode is the same, the diameter of the high voltage line electrode is 0.2 mm to 1 mm; the length of the high voltage line electrode is 10 cm to 200 cm.

Wherein, the vertical distance between the high-voltage line electrodes and the low-voltage line electrodes is 2 cm to 8 cm, and the horizontal distance between the high-voltage line electrodes in the high-voltage electrode unit is 5 cm to 15 cm.

Wherein, the repetition frequency of nanosecond pulses received by the pulse high voltage input terminal of the unbalanced plasma generating device is 100 Hz to 1000 Hz, the voltage amplitude is 50 kV to 150 kV, and the rising edge time of a single high voltage pulse is 30 ns.

Wherein, the mesh diameter of the shielding net is 0.5 mm.

The present invention also provides a granular powder surface modification treatment system, including a non-equilibrium plasma generating device, a pulse generator and a storage cage. The high-voltage input end is connected; the storage cage is used to collect processed particles; the non-equilibrium plasma generation device is the above-mentioned non-equilibrium plasma generation device.

The present invention can bring following technical effect:

(1) A high-voltage nanosecond repetition frequency pulse is used to directly drive the non-equilibrium plasma in the air under atmospheric pressure. The experimental results show that compared with the dielectric barrier discharge and corona discharge, the discharge peak current density in this discharge form is higher, resulting in The efficiency of the active particles is better and the non-equilibrium of the plasma is higher.

(2) The line array electrodes can have different lengths and numbers, which can increase the volume of the atmospheric pressure non-equilibrium plasma distribution in the discharge, so that the air ionization area can be filled in the entire discharge device, and the energy utilization efficiency of the pulse power supply can be improved.

(3) The line array electrode is set in an open air environment at normal temperature and pressure, does not require complicated dielectric barrier insulating layers, and abandons expensive and cumbersome vacuum and inflation systems. It is easy to construct a Stable non-equilibrium plasma generator. Thereby making its use less restrictive, and the application cost is greatly reduced.

Description of drawings

Fig. 1 is a schematic diagram of a non-equilibrium plasma generating device and a surface modification treatment system for granular powders of the present invention.

Fig. 2 is a schematic front view of the non-equilibrium plasma generating device of the present invention.

Fig. 3 is a schematic view of the reverse side of the non-equilibrium plasma generating device of the present invention.

Throughout the drawings, the same reference numerals are used to designate the same elements or structures, wherein:

1 is an unbalanced plasma generating device, 101 is a high-voltage line electrode; 102 is a low-voltage line electrode; 103 is a high-voltage electrode lead; 104 is a low-voltage electrode lead; 105 is a high-voltage electrode insulation cover; 106 is a low-voltage electrode insulation cover; 107 is 108 is the second through hole; 109 is the plasma generation area; 110 is the left shielding mesh; 111 is the right shielding mesh; 112 is the side insulation cover plate; 113 is the high voltage electrode fixing bolt; 114 is the low voltage Electrode fixing bolts; 2 is a pulse generator; 3 is particles to be processed; 4 is processed particles; 5 is a storage cage; 51 is a half-open insulating box; 52 is an electrostatic shielding plate.

detailed description

In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention.

The non-equilibrium plasma generating device 1 provided by the embodiment of the present invention can be applied to surface modification treatment of materials, sterilization and disinfection of medical instruments and equipment, and the like. Fig. 1 shows the structure of the non-equilibrium plasma generating device 1, and for the convenience of explanation, only shows the part related to the embodiment of the present invention, which is now described in detail as follows:

The unbalanced plasma generating device 1 includes a cavity, a shielding net, and a high-voltage electrode unit and a low-voltage electrode unit arranged in the cavity; wherein the cavity can be a cuboid cavity; the opposite surfaces of the cuboid cavity are respectively high-voltage electrode insulation The cover plate 105 and the low-voltage electrode insulation cover plate 106; the two opposite sides of the cuboid cavity are shielding nets 110, 111; the other two opposite sides of the cuboid cavity are sealing insulating plates 112.

The high-voltage electrode unit is arranged on the lower surface of the high-voltage electrode insulating cover plate 105. The high-voltage electrode unit includes a plurality of high-voltage line electrodes 101 arranged in a uniform array; Holes 107; one end of each high-voltage line electrode 101 is fixed to one end of the high-voltage electrode lead wire 103; the other end of the high-voltage line electrode 101 is fixed by a high-voltage electrode fixing bolt 113, and the other end of the high-voltage electrode lead wire 103 is drawn through the first through hole 107; and each The high-voltage electrode leads 103 are connected as the pulse high-voltage input end of the unbalanced plasma generating device 1 .

The low-voltage electrode unit is arranged on the lower surface of the low-voltage electrode insulating cover plate 106. The low-voltage electrode unit includes a plurality of low-voltage line electrodes 102 arranged in a uniform array; Through hole 108; one end of each low-voltage line electrode 102 is fixed to one end of low-voltage electrode lead 104; the other end of low-voltage line electrode 102 is fixed by low-voltage electrode fixing bolt 114, and the other end of low-voltage electrode lead 104 is drawn through the second through hole 108; And each low-voltage electrode lead 103 is connected to ground.

In the embodiment of the present invention, the high-voltage electrode leads 103 and the low-voltage electrode leads 104 cannot be arranged on the same plane, so as to avoid the electric field formed between the electrode leads from affecting the electric field distribution between the line electrodes, thereby causing an unbalanced plasma generation area Concentrate on one side of the device; the high-voltage electrode leads 103 and the low-voltage electrode leads 104 are respectively arranged on both sides of the high-voltage electrode insulating cover plates 105 and 106 .

In actual work, the high-voltage repetition frequency nanosecond pulse is applied to the two ends of the high and low voltage electrode leads 103, 104, thereby forming an extremely uneven electric field between the high and low line array electrodes, and the extremely uneven field causes the air to discharge . As the distance between the high and low line array electrodes changes, the form of the discharge will also change. Appropriately selecting the distance between the high and low line array electrodes can obtain a diffuse glow discharge between spark discharge and corona discharge. The atmospheric pressure non-equilibrium plasma generated by the diffuse glow discharge is evenly distributed between the high and low line array electrodes.

Generally speaking, compared with the prior art, the above technical solution conceived by the present invention can obtain the following advantages:

(1) The device uses a high-voltage nanosecond repetition frequency pulse to directly drive non-equilibrium plasma in air under atmospheric pressure. The experimental results show that compared with dielectric barrier discharge and corona discharge, the discharge peak current density in this discharge form Larger, more efficient generation of active particles and higher plasma non-equilibrium.

(2) In this device, the line array electrodes can have different lengths and numbers, which can increase the volume of the atmospheric pressure non-equilibrium plasma distribution in the discharge, so that the air ionization area is filled in the entire discharge device, and the utilization of pulse power energy is improved. efficiency.

(3) In this device, the line array electrode is set in an open air environment at normal temperature and pressure, without the need for a complicated dielectric barrier insulating layer, and the expensive and cumbersome vacuum and inflation system is abandoned, and it is easy to construct a compact, light-weight, An unbalanced plasma generator with small size and stable performance. Thereby making its use less restrictive, and the application cost is greatly reduced.

In the embodiment of the present invention, both the high-voltage wire electrode 101 and the low-voltage wire electrode 102 can use wire-shaped electrodes. An inhomogeneous electric field is a necessary condition for generating non-equilibrium plasma at atmospheric pressure. The high-voltage line electrode 101 and the low-voltage line electrode 102 can be made of copper, aluminum, graphite and other conductors. The process of making electrodes belongs to the known technology known to those skilled in the art, and will not be repeated here.

In the embodiment of the present invention, the left and right shielding nets and the high and low voltage electrode fixing bolts are all made of insulating materials, and the mesh diameter of the shielding net is 0.5mm. The role of the shielding net is to filter out large-diameter magazine particles entering the unbalanced plasma generator 1, and to ensure that the internal working conditions of the unbalanced plasma generator 1 are always maintained at atmospheric pressure air conditions, and expensive and cumbersome vacuum and gas filling systems are discarded , so that the conditions of use of the device are not limited.

In the embodiment of the present invention, the diameters of the high-voltage line electrodes 101 and the low-voltage line electrodes 102 may be selected from 0.2 mm to 1 mm. The length adjustment range of the high-voltage wire electrode 101 and the low-voltage wire electrode 102 can be between 10 cm and 200 cm. The diameter and length of the high and low voltage line electrodes 101 and 102 are set mainly for the purpose of forming an extremely uneven electric field between the electrodes, which is also one of the necessary conditions for the generation of non-equilibrium plasma in the air.

Wherein, the vertical distance between the high-voltage line electrodes 101 and the low-voltage line electrodes 102 can be between 2 cm and 8 cm, and the horizontal distance between the high-voltage line electrodes 101 in the high-voltage electrode unit can be between 5 cm and 15 cm. The arrangement of each low-voltage line electrode 102 in the low-voltage electrode unit is the same as that in the high-voltage electrode unit. The vertical and horizontal spacings of the high and low-voltage line electrodes 101 and 102 are also set for the purpose of forming an extremely uneven electric field between the electrodes. Experiments have found that as the vertical spacing of the electrodes decreases, the discharge changes from a diffuse glow discharge to the wire. The form of spark discharge develops, and with the increase of the vertical distance between electrodes, the discharge develops from diffuse glow discharge to weak corona discharge. Similarly, as the horizontal spacing of electrodes decreases, the discharge develops from diffuse glow discharge to filamentary spark discharge, and as the horizontal spacing of electrodes increases, the discharge develops from large-volume diffuse glow discharge to individual A separate diffuse glow discharge develops.

In the embodiment of the present invention, the repetition frequency of the nanosecond pulses received by the pulsed high-voltage input terminal of the unbalanced plasma generating device 1 is within 100 Hz to 1000 Hz, the voltage amplitude is within 50 kV to 150 kV, and the rising edge time of a single high-voltage pulse is 30ns. The selection of the amplitude and rising edge of the pulse high voltage is also aimed at forming an extremely uneven electric field between the electrodes, which is also a necessary condition for the generation of non-equilibrium plasma in the air. Experiments have found that as the rising time of the high-voltage pulse decreases, the discharge develops from a filamentous spark discharge to a diffuse glow discharge that can generate non-equilibrium plasma, and the greater the amplitude of the nanosecond pulse, the higher the frequency. The higher the discharge intensity, the greater the discharge intensity of the glow discharge, and gradually make the discharge develop from diffuse glow discharge to filamentary spark discharge.

In order to further illustrate the non-equilibrium plasma generating device 1 provided by the embodiment of the present invention, it is now described in detail in conjunction with specific examples as follows:

In practice, by adjusting the amplitude, rising edge time and repetition frequency of high-voltage nanosecond pulses, as well as adjusting the material, diameter, length, horizontal spacing, vertical spacing, and number of wire array electrodes, a large number of In the discharge experiment, a large number of examples of large-volume diffuse discharge have been obtained. The specific examples are as follows.

This embodiment is a device for generating non-equilibrium plasma in the air for surface modification treatment of granular powder, and its structural layout is shown in Fig. 1 , Fig. 2 and Fig. 3 . The high-voltage line electrode 101 and the low-voltage line electrode 102 are graphite wires with a diameter of 0.8mm and a length of 100cm. The number of high-voltage and low-voltage line array electrode lines is 6 respectively. The vertical spacing between the line array electrodes is 4cm, and the horizontal spacing is 12cm. The input pulse amplitude of the pulse high voltage input terminal of the unbalanced plasma generating device 1 is 120kV, the rising edge time is 30ns, the repetition frequency is 500Hz, and the particle 4 to be treated is nano-carbon black. In the experiment, a large-volume diffuse discharge plasma was generated, and the properties of the nano-carbon black material were improved after treatment.

The specific examples of each parameter in the non-equilibrium plasma generating device 1 provided by the embodiment of the present invention are detailed in the following table:

Table 1

The non-equilibrium plasma generation device 1 provided by the embodiment of the present invention can be applied to a granular powder surface modification treatment system. As shown in Figure 1, the granular powder surface modification treatment system includes an non-equilibrium plasma generation device 1, a The generator 2 and the storage cage 5; wherein the pulse generator 2 is connected to the pulse high-voltage input end of the unbalanced plasma generating device 1 through a high-voltage wire; In the plasma generation device, after entering the plasma generation area, the granular powder material is subjected to plasma surface modification treatment, and the treated particles 4 enter the storage cage 5 through the right shielding net 111 under the wind force of the blower. Finally, the processed particles 4 are deposited under the electrostatic shielding plate under the action of surface electrostatic adsorption, thereby completing the collection of particle powder materials.

Among them, the unbalanced plasma generating device 1 includes a high-voltage line electrode 101, a low-voltage line electrode 102, a high-voltage electrode lead 103, a low-voltage electrode lead 104, a high-voltage electrode insulating cover plate 105, a low-voltage electrode insulating cover plate 106, a first through hole 107, and a first through hole 107. Two through holes 108 , plasma generation area 109 , left shielding mesh 110 , right shielding mesh 111 , side insulation cover 112 , high voltage electrode fixing bolts 113 , and low voltage electrode fixing bolts 114 .

The storage cage 5 includes a semi-open insulating box 51 and an electrostatic shielding plate 52 .

The unbalanced plasma generating device 1 is a rectangular parallelepiped unbalanced plasma generating device, and the structural design and arrangement of the entire generator are front-back and center-symmetrical. The upper and lower surfaces of the unbalanced plasma generator 1 are composed of a high-voltage electrode insulating cover plate 105 and a low-voltage electrode insulating cover plate 106 . The high-voltage line electrode 101 is placed on the lower surface of the high-voltage electrode insulating cover plate 105 , and the low-voltage line electrode 102 is placed on the upper surface of the high-voltage electrode insulating cover plate 106 . The first through hole 107 is located at one end of the high voltage electrode insulating cover plate 105 , and the second through hole 108 is located at one end of the low voltage electrode insulating cover plate 106 . The high-voltage electrode leads 103 are led downward through the first through hole 107 , and the low-voltage electrode lead 104 is led upward through the second through hole 108 . One end of the high-voltage wire electrode 101 is fixed to the lower end of the high-voltage electrode lead wire 103 by winding, and a reliable electrical connection is obtained; the other end of the high-voltage wire electrode 101 is fixed by a high-voltage electrode fixing bolt 113 . Similarly, one end of the low-voltage line electrode 102 is fixed to the upper end of the high-voltage electrode lead wire 104 by winding, and a reliable electrical connection is obtained; the other end of the low-voltage line electrode 102 is fixed by a low-voltage electrode fixing bolt 114 . In order to avoid distortion of the electric field between the line array electrodes caused by the electric field between the high-voltage and low-voltage electrode leads, the connection ends of the high-voltage line electrodes 101 and the low-voltage line electrodes 102 and the respective leads are not taken on the same vertical plane, but are respectively It is fixed at the front and rear ends of the unbalanced plasma generating device 1 . At the same time, the fixing between the high-voltage wire electrode 101 and the low-voltage wire electrode 102 and the high-voltage and low-voltage insulating cover plates are all detachable connections, so as to facilitate electrode replacement in practical applications.

The plasma generation region 109 is located between the high voltage line electrode 101 and the low voltage line electrode 102 . The left and right sides of the unbalanced plasma generating device 1 are respectively a left shielding net 110 and a right shielding net 111, and the front and rear sides are side insulating covers 112, which are connected with the high voltage electrode insulating cover 105 and the low voltage electrode insulating cover. The plates 106 together constitute a semi-closed plasma generation chamber under atmospheric pressure.

In the present invention, the high-voltage line electrode 101 and the low-voltage line electrode 102 are conductive filaments, which can be made of metal conductors such as copper and aluminum, or non-metallic conductors such as graphite. The number of high-voltage line electrodes 101 and low-voltage line electrodes 102 is adjustable, specifically, it can be adjusted between 1 and 20. The diameters of the high-voltage line electrodes 101 and the low-voltage line electrodes 102 are between 0.2 mm and 1 mm. The lengths of the high-voltage line electrodes 101 and the low-voltage line electrodes 102 can also be adjusted, and the specific adjustment range is between 10 cm and 200 cm. Diffuse discharge non-equilibrium thermal plasma can only be generated under the condition of extremely uneven electric field. In view of this, the vertical distance between the high-voltage line electrode 101 and the low-voltage line electrode 102 is between 2cm and 8cm, and the horizontal distance is between 5cm and 15cm. .

The high-voltage electrode insulating cover 105 , the low-voltage electrode insulating cover 106 and the side insulating cover 112 are made of high-insulating materials, such as plexiglass and epoxy resin.

The high-voltage electrode leads 103 and the low-voltage electrode leads 104 can be made of conductive materials such as copper wires and aluminum wires, with a diameter of 0.8mm. The first through hole 107 and the second through hole 108 are circular through holes with a diameter of 1 mm.

The shielding net 110 on the left side and the shielding net 111 on the right side are both made of insulating materials, and the mesh diameter of the shielding net is 0.5 mm, so as to filter out large-diameter foreign matter particles entering the unbalanced plasma generator 1 . The high-voltage electrode fixing bolts 113 and the low-voltage electrode fixing bolts 114 are also made of insulating materials. During the discharge process, the plasma generation region 109 is in a large-volume space dispersed discharge state.

The pulse generator 2 is connected to the unbalanced plasma generating device 1 through a high-voltage wire. The particles 3 to be treated can be organic granular powders such as nano-carbon black and PET film materials, and the treated particles 4 are organic granular powders such as nano-carbon black and PET film materials after plasma surface modification. Storage cage 5 is a semi-open cube box. The semi-open insulating box 51 is made of insulating material, to prevent the influence of the electric field in the plasma generation area, materials such as plexiglass and epoxy resin can be selected; the electrostatic shielding plate 52 is made of metal conductive material, and can be selected from copper, iron, Aluminum and other materials.

In the actual operation of the system, the pulse generator 2 provides high-voltage nanosecond pulses with a repetition frequency required for diffuse discharge for both ends of the high-voltage and low-voltage line array electrodes in the unbalanced plasma generation device 1. The repetition frequency of the applied pulses can be 100Hz It can be adjusted within 1000Hz, the voltage amplitude can be adjusted within 50kV to 150kV, and the rising edge time of a single high-voltage pulse is at the nanosecond level, specifically 30ns. After the high-voltage nanosecond pulse is applied to both ends of the line array electrodes, a large-volume diffuse discharge non-equilibrium thermal plasma under atmospheric pressure air conditions is generated in the central area of the non-equilibrium plasma generating device. The particles 3 to be treated are blown into the unbalanced plasma generating device 1 by the blower through the left shielding net 110, and enter the plasma generating area 109. After the plasma surface modification treatment, the granular powder material has been treated. Particles 4 enter the storage cage 5 through the right shielding net 111 under the wind force of the blower. Finally, the processed particles 4 are deposited under the electrostatic shielding plate 52 under the action of surface electrostatic adsorption, thereby completing the collection of particle powder materials.

In atmospheric air environment, gas discharge is more often manifested as spark channel discharge and corona discharge. Diffuse glow discharge is a special discharge form between spark discharge and corona discharge. The non-thermal equilibrium plasma generated by diffuse discharge is a partially ionized low-temperature plasma, and the temperature difference between electrons and ions is very large. The treatment of materials by non-equilibrium plasma mostly focuses on the treatment of macroscopic finished products such as thin films. Compared with thin films or similar materials, the contact area between granular powder materials and gases is much larger. Therefore, the surface morphology and structure of the powder after plasma treatment, and even the particle size may change significantly.

Generally speaking, compared with the prior art, the above technical solution conceived by the present invention can obtain the following advantages:

(1) The granular powder surface modification treatment system introduced in the present invention can generate a large volume of non-equilibrium plasma, thereby increasing the contact area between the granular powder and the plasma, so that the surface modification treatment of the granular powder material can be carried out More fully, greatly improving the efficiency of powder surface modification treatment.

(2) In this system, the surface modification treatment of powdery particles is carried out in an air environment at normal temperature and pressure, and no complicated dielectric barrier insulating layer is required, which avoids the pollution of the particles by the material of the dielectric barrier layer during the surface modification process.

(3) The system abandons the expensive and cumbersome vacuum and inflation systems, and it is easy to construct a device system with compact structure, light weight, small volume and stable performance. Therefore, the limitation of the use of the system is small, which is of great significance for the industrial application of plasma.

It is easy for those skilled in the art to understand that the above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention, All should be included within the protection scope of the present invention.

Claims (5)

1. a particulate powder surface modification treatment system, comprise nonequilibrium plasma generation device (1), pulse generator (2) and storage cage (5), described pulse generator (2) is connected by the high voltage pulse input of high-voltage conducting wires with described nonequilibrium plasma generation device (1); Described storage cage (5) is for collecting processed particle (4); It is characterized in that, described nonequilibrium plasma generation device (1) comprises cavity, gauze screen and the high-field electrode unit that is arranged in cavity and low-field electrode unit;

Two surfaces relative in described cavity are as high voltage electrode insulation cover plate (105) and low-field electrode insulation cover plate (106), two relative sides are as gauze screen (110,111), and two other relative side is as sealed insulation plate (112);

Described high-field electrode unit is arranged on the lower surface of described high voltage electrode insulation cover plate (105), described high-field electrode unit comprises the high-voltage line electrode (101) of multiple uniform array arrangement, and described high voltage electrode insulation cover plate (105) is provided with first through hole (107) of multiple uniform array arrangement; The go between one end of (103) of one end of each high-voltage line electrode (101) and described high-field electrode is fixed; The other end of described high-voltage line electrode (101) is fixed by described high-field electrode set bolt (113), and the other end of described high-field electrode lead-in wire (103) is drawn by described first through hole (107); And using the high voltage pulse input as described nonequilibrium plasma generation device after each high-field electrode lead-in wire (103) connection;

Described low-field electrode unit is arranged on the lower surface of described low-field electrode insulation cover plate (106), and described low-field electrode unit comprises the low-voltage line electrode (102) of multiple uniform array arrangement; Described low-field electrode insulation cover plate (106) is provided with second through hole (108) of multiple uniform array arrangement; The go between one end of (104) of one end of each low-voltage line electrode (102) and described low-field electrode is fixed; The other end of described low-voltage line electrode (102) is fixed by described low-field electrode set bolt (114), and the other end of described low-field electrode lead-in wire (104) is drawn by described second through hole (108); And ground connection after each low-field electrode lead-in wire (103) is connected.

2. particulate powder surface modification treatment system as claimed in claim 1, it is characterized in that, described high-voltage line electrode (101) is identical with the structure of described low-voltage line electrode (102), and the diameter of described high-voltage line electrode (101) is 0.2mm to 1mm; The length of described high-voltage line electrode (101) is 10cm to 200cm.

3. particulate powder surface modification treatment system as claimed in claim 1 or 2, it is characterized in that, the vertical interval of described high-voltage line electrode (101) and low-voltage line electrode (102) is 2cm to 8cm, and the level interval of each high-voltage line electrode (101) in high-field electrode unit is 5cm to 15cm.

4. particulate powder surface modification treatment system as claimed in claim 3, it is characterized in that, the repetition rate of the nanosecond pulse of the high voltage pulse input reception of described nonequilibrium plasma generation device is 100Hz to 1000Hz, voltage magnitude is 50kV to 150kV, and the rising time of single high-voltage pulse is 30ns.

5. particulate powder surface modification treatment system as claimed in claim 3, it is characterized in that, the mesh diameter of described gauze screen (110,111) is 0.5mm.