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Titolo:
Power consumption measurements for ac and pulsed dc for electrostatic coalescence of water-in-oil emulsions
Autore:
Lee, CM; Sams, GW; Wagner, JP;
Indirizzi:
Texas A&M Univ, Dept Nucl Engn, Separat Grp, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 at Grp, College Stn, TX 77843 USA
Titolo Testata:
JOURNAL OF ELECTROSTATICS
fascicolo: 1, volume: 53, anno: 2001,
pagine: 1 - 24
SICI:
0304-3886(200106)53:1<1:PCMFAA>2.0.ZU;2-8
Fonte:
ISI
Lingua:
ENG
Soggetto:
LIQUID-PHASE SEPARATION; W/O EMULSION; HIGH-VOLTAGE; FIELDS; DEMULSIFICATION;
Keywords:
electrostatic coalescence; demulsification; water-in-oil emulsions; true root mean square power consumption measurements; processing costs;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
--discip_EC--
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Wagner, JP Texas A&M Univ, Dept Nucl Engn, Separat Grp, College Stn, TX 77843 USA Texas A&M Univ College Stn TX USA 77843 lege Stn, TX 77843 USA
Citazione:
C.M. Lee et al., "Power consumption measurements for ac and pulsed dc for electrostatic coalescence of water-in-oil emulsions", J ELECTROST, 53(1), 2001, pp. 1-24

Abstract

True root mean square power consumption measurements for coalescence of well-defined water-in-oil (W/O) emulsions [reverse osmosis water dispersed inIsopar M and stabilized with Paranox 100 surfactant] are presented for a 2-1 Teflon insulated electrostatic coalescer. Estimated electricity costs for processing 1000 barrels (42 gal basis) of the emulsion were as low as $0.37 and $0.39 under 60Hz ac and pulsed de (i.e., half-wave rectified ac) fields, respectively. These data compare favorably with actual operating costsfor an equivalent volume of crude oil for NATCO designed full-scale electrostatic coalescer systems with noninsulated electrodes. Contrary to observations by other investigators including past tests in our own laboratory, acfields were more effective in increasing coalescence rate than pulsed de fields. Normalized power consumption data show that the optimized frequency for coalescence with electricity costs as the important factor was at 60 Hz(i.e., the lowest frequency tested) in spite of dramatic increases in throughputs at higher frequencies of 120, 400 and 600 Hz. Comparative tests using identically prepared W/O emulsions showed that the coalescence rate withthe present system was up to 11-fold higher as compared to a geometricallysimilar coalescer using a patented plastic-sealed electrode under identical 600 Hz ac fields. (C) 2001 Elsevier Science B.V. All rights reserved.

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Documento generato il 06/08/20 alle ore 12:58:08