The method of producing the plasma flow of electrolyte vapor and device for its implementation

 

The invention relates to devices and methods of preparation, research and application of low-temperature plasma and can be used in the plasma chemistry, plasma technology and plasma processing of materials. The method of producing the plasma flow of the vapor of the electrolyte is in the ignition the glow discharge between the flowing liquid electrolyte and a metallic water-cooled anode rod located above the electrolyte. When this anode rod is installed horizontally with a gap of 3-4 mm between him and the electrolyte. After ignition of the discharge current is increased up to those values, at which the current density on the liquid electrolyte cathode was at least 5 A/cm2. When the electrolyte level rises to the height difference of final and initial levels of the electrolyte was equal to the initial gap between the metal rod anode and electrolyte. Device for receiving a stream of plasma from the vapors of the electrolyte includes a vessel having a hole for pumping electrolyte, current lead mounted within the vessel below the hole, the electrolyte is poured into the vessel above the level of the electrical power supply, a pipe for the supply of electrolyte and water-cooled metal rod ANO is. The anode may have a horseshoe shape of a semicircle or other flat curved geometric lines. Effect: increase the enthalpy of the plasma flow and the increase of its degrees of freedom. 1 C. p. F.-ly, 3 ill.

The invention relates to methods of producing, research and application of low-temperature plasma and can be used in the plasma chemistry, plasma processing technologies of materials and plasma technology, in particular in plasma-chemical reactors.

A method of obtaining the plasma flow of the vapor of the electrolyte in which the electrolyte is fed into the discharge region through the porous dielectric [1]. The disadvantage of this method is that the enthalpy (heat content) of the plasma flow is low, because the current density on porous electrolyte cathode cannot be increased above a certain limit. This is because at high current densities under the action of the reactive power flow of plasma electrolyte is forced inside the porous cathode body and exposed from the electrolyte surface of the porous cathode body collapse under the effects of heat of plasma.

Know of any other way of getting sweat the EC which concerns the electrolyte, filled in the electrolytic bath, and near the open upper end is mounted solid-state anode [2]. The disadvantage of this method is that it is necessary to take additional measures to protect the dielectric tube from the heat of the electric discharge. The heat flux from the plasma increases with increasing current. Therefore, this method is acceptable only for small current densities.

A prototype device for implementing the method selected device containing an electrolytic bath consisting of an open vessel equipped with a busbar, and the electrolyte, a water-cooled anode in the form of a rod that is located vertically above the electrolyte, and the delivery system of the electrolyte [3]. The main disadvantage of the prototype is that the plasma flow is directed along the rod anode and therefore the plasma flow are difficult to use for technological purposes.

The invention aims to increase the enthalpy of the plasma flow and the increase of its degrees of freedom, i.e. the creation of the plasma flow extending further from the electrodes.

This is achieved in that in the method of producing the plasma flow of the vapor of the electrolyte, which consists in the ignition of the glow discharge between the flowing liquid electroly which shall be fixed horizontally with a gap of 3-4 mm between him and the electrolyte and after ignition of the discharge current rises to such a height, to the current density on the cathode electrolyte was not less than 0.5 A/cm2and the electrolyte level rises to the height difference of final and initial levels of the electrolyte was equal to the initial gap between the metal rod anode and electrolyte.

Device to implement the method (Fig.1) consists of a vessel 1, which is supplied by current supply 2, the electrolyte 3, poured into the vessel 1, and a water-cooled anode rod 4, which is located horizontally below the electrolyte. The vessel 1 through the opening 5 in the side wall, which is higher than the electrical power supply 2 is connected to the evacuation system of the electrolyte. To the vessel 1 at a wall located opposite the openings 3, is mounted a pipe 6 through which the vessel 1 communicates with the supply system of the electrolyte. The electrolyte 3 serves as a liquid cathode.

Section anode rod may have a different geometric shape, in particular a rectangular shape with rounded outlines (Fig.2). The anode can be performed not only in the form of a straight rod, but in the form of various flat and curved lines, for example, of a semicircle (Fig.3A) or a horseshoe (Fig.3b).

The method is as follows. Sets the mode of flow of electrolyte through the vessel so that Zaza and known methods ignites the discharge between the electrolyte 3 and the anode 4. The electrolyte is prepared from aqueous solutions of salts, alkalis and acids. Its conductivity should be in the range of 10-4-10-2Ohm·cm-1. Such conductivity of the electrolyte provides combustion in glow discharge mode (diffuse, three-dimensional form).

The discharge current is maintained for 1-2 minutes within 3-4 A. After that, the anode 4 is supplied coolant. This procedure at the beginning of startup of the device is desirable in order drops of the electrolyte formed by the condensation of vapors on the original cold surface of the anode 4, flowing down, not locked bit interval l. Without this procedure, the ignition discharge is difficult. However, the possibility of ignition of the discharge is not eliminated. Further, the discharge is displayed on the mode with a current density of liquid cathode of at least 0.5 A/cm2after which the level of the electrolyte 3 in the vessel 1 rises to 3-4 mm, While the reactive force of the vapor electrolyte deforms the surface of the electrolyte 3 inward, as shown in Fig.2. Bit 7 is lit within the recess in the electrolyte 3. A pair of electrolyte evaporated with a concave surface. This results in a cumulative effect. A pair of electrolyte is directed almost panastereo the anode 4 and extends above the anode. Thus the positive effect of the proposed invention. Since the cross-section of the rod electrode 4 is small, the plasma stream is removed from the anode 4 to a considerable distance. This contributes to the expansion of technological and other opportunities for practical application of the plasma flow. In particular, facilitated the input of the processed material into a plasma stream.

The proposed device is characterized by its simplicity. There are no structural elements (except for the anode), subjected to heat discharge. Therefore, the current density can be increased up to the maximum limit, which is implemented smoldering combustion mode discharge. The resulting plasma stream with high enthalpy. This is another positive effect of the proposed invention.

In the experiments, the current density on the liquid cathode reached 1.0 a/cm2. The electrolyte is prepared from aqueous solutions of salt and baking soda. The anode was made of steel. Used anodes length 4-7 see the Lateral dimensions of the anode were in the range of 8-9 mm, i.e., the length of the anode was much larger than the maximum size of its cross section. Visual observation is ecene anode.

Sources of information

1. RF patent №2169443. Method of creating an electrolyte discharge and device for its implementation. Tasmeem B. H., Tasmeem H. K. 2001, bul. No. 17.

2. A. C. the USSR №1088086. Gaisin F. M., Gizatullina F. A., Dautov, Yu apparatus for producing a glow discharge at atmospheric pressure. 1983.

3. Gaisin F. M., Gizatullina F. A., Kamalov P. P. Power characteristics of discharges in the atmosphere between the electrolyte and the copper anode. Phys-HOM. 1985, No. 4, S. 58-64.

Claims

1. The method of producing the plasma flow of the vapor of the electrolyte, which consists in the ignition of the glow discharge between the flowing liquid electrolyte and a metallic water-cooled anode rod located above the electrolyte, wherein the anode rod is installed horizontally with a gap of 3...4 mm between him and the electrolyte and after ignition of the discharge current is increased up to those values, at which the current density on the liquid electrolyte cathode was at least 5 A/cm2and the electrolyte level rises to the height difference of final and initial levels of the electrolyte was equal to the initial gap between the metal rod anode and electrolyte.

2. Device for Ponce for pumping electrolyte; current lead mounted within the vessel below the hole on the side wall; the electrolyte is poured into the vessel above the level of the electrical power supply; a nozzle for supplying electrolyte attached to the vessel opposite the hole on the side wall, and a metallic water-cooled anode rod located above the electrolyte, characterized in that the metal water-cooled anode rod mounted horizontally, parallel to the surface of the electrolyte in the vessel.

3. The device according to p. 2, characterized in that the water-cooled anode is made u-shaped, semi-circle or other flat curved geometric lines.



 

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