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High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes
SJR: 0.137 SNIP: 0.341 CiteScore™: 0.43

ISSN Print: 1093-3611
ISSN Online: 1940-4360

High Temperature Material Processes: An International Quarterly of High-Technology Plasma Processes

DOI: 10.1615/HighTempMatProc.v13.i2.50
pages 165-177

SPEED DETERMINATION OF AUTO-ELECTRO-MAGNETIC ROTATION (AEMR) OF DC ARC IN "PLASMALAB" FFP-PLASMA REACTOR

V. Hadzhiyski
“PLASMALAB” - Plasma Metallurgy Research Laboratory, University of Chemical Technology and Metallurgy - Sofia, 8 “Kliment Ohridsky” Blvd., 1156, Sofia, Bulgaria
Mihail K. Mihovsky
“PLASMALAB” - Plasma Metallurgy Research Laboratory, University of Chemical Technology and Metallurgy - Sofia, 8 “Kliment Ohridsky” Blvd., 1156, Sofia, Bulgaria

ABSTRACT

The new "PLASMALAB" FFP-reactor consists of plasma torch with hollow cathode (or common graphite hollow cathode), coaxially mounted over a vertical cylindrical reactor-anode.
The original technical solution for series connection of an inductor, coaxially mounted on the tube reactor-anode in the anode electric chain, allows arc rotation which is generated by the arc own current (Auto-Electro-Magnetic Rotation -AEMR).
The designed and manufactured experimental stand makes possible the test of a graphite model of a new "PLASMALAB" FFP-plasma reactor. Experiments involving a common hollow graphite cathode (without plasma torch with water cooled nozzle) are performed on that stand. The advantage of this variant is that it is not necessary to blow plasma gas, which additionally cools the reactor space. In principle, this is one of the new solutions in the "PLASMALAB" reactor design.
The main aim of this actual work is to develop an original scheme for measurement of speed rotation of DC arc, burning in an axial magnetic field. Rotation speeds of the arc spots (cathode and anode) under Auto-Electro-Magnetic Rotation are found. as functions of arc current and magnetic-field power.
The results found employing the graphite model (new "PLASMALAB" FFP-plasma reactor) show that the rotation speed of the cathode spot is by an order lower than that of the anode spot. The maximal average rotation speed of the cathode spot found is about 800 min−1 at arc current 250 A and a distance between cathode front and inductor end - Δ = 50 mm. Under the same conditions, the maximal average rotation speed of the anode spot is over 10 000 min−1.

REFERENCES

  1. MacRae DR, Plasma Reduction of Iron Ores to Raw Steel.

  2. Mihovsky M. and Tzonev Tz., Advenced Plasma Furnace and Technology for Reduction Processing.

  3. Mihovsky M., Tzonev Tz., and Lucheva B., Plasma Torch-Reactor for Reduction Processing in Metallurgy.

  4. Mihovsky M., Tzonev Tz., and Lucheva B., Motion Organization of Plasma Arc in Plasma Torch-FFP-Reactor System.

  5. Essiptchouk A.M., Sharakhovsky L.I., and Marotta A., A new formula for the rotational velocity of magnetically driven arcs.

  6. Essiptchouk A.M., Marotta A., and Sharakhovsky L.I., The effect of arc velocity on cold electrode erosion.

  7. Chau S.W., Hsu K.L., Lin D.L., and Tzeng C.C., Experimental study on copper cathode erosion rate and rotational velocity of magnetically driven arcs in a well-type cathode non-transferred plasma torch operating in air.

  8. Paik S., Huang P.C., Heberlein J., and Pfender E., Determination of arc root position in a DC Plasma Torch.

  9. Coudert J.F., Planche M.P., and Fauchais P., Characterisation of DC Plasma Torch Voltage Fluctuations.

  10. Brillhac J.F., Pateyron, B.G. Delluc, Coudert J.F., and Fauchais P., Behavior of DC vortex Plasma Torches Part I, Button type Cathode.

  11. Szente N., Munz R.A., and Drouet M., lectrode erosion in plasma torches.

  12. Mihovsky M., Hadzhiyski V., and Todorov L., Electromagnetic and Gas Dynamic Control of Transferred Plasma Arc in Metallurgical Plasma Reactors and Furnaces.


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