chemical physics of discharges - Argonne National Laboratory
chemical physics of discharges - Argonne National Laboratory chemical physics of discharges - Argonne National Laboratory
Acknowledgements . 303 The author is indebted to a number of his colleagues and to Dr. C.A.Walley of the Department of Electrical Engineerlng for manv helpful discussions. Refcrcnrcs. (1) Andcrsen W . H . , Zwollnski B.J., Parlin R.B., 1nd.Eng.Cheni. ,1959.%.(4).527. Breirer A.L. , W~sthai cr J.W. , J .Phvs .Chem. , 1929.2.883 (Cf. also J .Phys .Chem. 1930. '4. 153) Cotton W. J. , Trans .Elect rocheni.Soc. , 1947. 2, 407, 419. Devins .J .C. , Burton M. , J .Anier.Chem.Soc. , 1954., 3. 2618. Ilowatson A.M., "Introduction to Gas Discharges" (Pergamon. PreSS,1965). Imperial Chemical .Industries, U.K.Patents 948,772; 958,776; 958,777; 958,778; 9GG,40G (all 1964). Kraaij\.cld Von H.J., Waterman J.I., Brennstoff-Chemic?, 1961.42.(12),369. Llewellyn-Jones F., "Ionisation an? Breakdpwn in Gases", (Methuen & Co. Lrd. 1966). AlcCarthy R.L., J.Chem.Phys., 1954, 22, 13FO. hliya-zaki, Takahashi, Nippon Ragaku Zasshi, 1958. 3. 553. Sergio R. Unpublished Work, University of 'Newcastle upon Tyne. England. Thornton J.D., Chem.Proccssing, 1966. (2), SG. Thornton J.D., Charlton W.D., Spedding P.L.., "Hydrazine,Synthesis in a Silent Electrical Discharge" (to be published).
GENERATION AND MEASUREMENT OF AUDIO FREQUENCY POWER FOR CHEMICAL-ELECTRICAL DISCHARGE PROCESSES \ James C. Fraser '. Research and Development Center General Electric Company Schenectady.. New York In developing equipment for use in high voltage, high frequency chemical-electrical processing, we have built a number of different types of "corona" power supplies. At the start, from the standpoint of the electrical equipment, let us use "corona" in its broadest sense. We will define a "corona" discharge as an electric discharge produced by capacitively exciting a gaseous medium lying between two spaced electrodes, at least one of which is insulated from the gaseous medium by a dielectric barrier. A corona discharge may be maintained over wide ranges of pressure and frequency, although atmospheric pressure and frequencies in the audio range substantially above power trans- mission values are typically employed. Since the power which can be dissipated in a corona reactor or cell is a function of the supply frequency, we have settledarbitrarily on the audio range (3,000 to 10,000 cycles per second) as a desirable compromise. It is within the l i m i t s of rotating machinery and solid state components, presents no undue corona reactor heat dissipation problems, and provides a happy compromise between operating voltages, reactor size, and economy of operation. The ratings for the basic electrical components are dependent upon the characteristics of the corona reactor and the impedance load which it represents to the power supply. Corona reactor values which affect these ratings are: a. The corona power required b. The electrode corona power density and, thereby, the electrode cooling or heat dissipation capability C. The gaseous atmosphere present d. The gaseous gap spacing e. The barrier material and dielectric constant From these values we can determine: a. b. c. Peak voltage required to initiate corona Barrier thickness required to withstand the total voltage across the barrier in the event of an arc across the gap Barrier, gaseous gap, and total reactor capacitance d. e. f. Maximum operating voltage Capacitive charging, or displacement, current drawn by the reactor Corona resistive current . g. h. Resultant load current Power factor of the corona reactor load I .I 1 ? \ 1 \ '\
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Acknowledgements .<br />
303<br />
The author is indebted to a number <strong>of</strong> his colleagues and to Dr. C.A.Walley<br />
<strong>of</strong> the Department <strong>of</strong> Electrical Engineerlng for manv helpful discussions.<br />
Refcrcnrcs.<br />
(1) Andcrsen W . H . , Zwollnski B.J., Parlin R.B., 1nd.Eng.Cheni. ,1959.%.(4).527.<br />
Breirer A.L. , W~sthai cr J.W. , J .Phvs .Chem. , 1929.2.883 (Cf. also J .Phys .Chem.<br />
1930. '4. 153)<br />
Cotton W. J. , Trans .Elect rocheni.Soc. , 1947. 2, 407, 419.<br />
Devins .J .C. , Burton M. , J .Anier.Chem.Soc. , 1954., 3. 2618.<br />
Ilowatson A.M., "Introduction to Gas Discharges" (Pergamon. PreSS,1965).<br />
Imperial Chemical .Industries, U.K.Patents 948,772; 958,776; 958,777; 958,778;<br />
9GG,40G (all 1964).<br />
Kraaij\.cld Von H.J., Waterman J.I., Brennst<strong>of</strong>f-Chemic?, 1961.42.(12),369.<br />
Llewellyn-Jones F., "Ionisation an? Breakdpwn in Gases", (Methuen & Co.<br />
Lrd. 1966).<br />
AlcCarthy R.L., J.Chem.Phys., 1954, 22, 13FO.<br />
hliya-zaki, Takahashi, Nippon Ragaku Zasshi, 1958. 3. 553.<br />
Sergio R. Unpublished Work, University <strong>of</strong> 'Newcastle upon Tyne. England.<br />
Thornton J.D., Chem.Proccssing, 1966. (2), SG.<br />
Thornton J.D., Charlton W.D., Spedding P.L.., "Hydrazine,Synthesis in a<br />
Silent Electrical Discharge" (to be published).
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