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Performance of the CNEN MHD Blow-Down Loop Facility

Abstract

The CNEN facility has been designed, manufactured and used for alkali-seeded noble gas MHD energy conversion research, as the major experimental effort during the first five-year CNEN Research Programme on MHD. The main specifications and the general arrangement with information on preliminary commissioning tests of some components were given at the Salzburg Symposium. Since then the facility has been successfully commissioned and from March 1967 has been working on MHD experiments. Efforts were made to reduce any adverse effects on the experimental MHD results that were due to inherent limitations of an experimental apparatus (particularly under open-circuit conditions). Great emphasis was placed on problems of caesium vaporization and the mixing with helium, the purity level of the mixture, measurements and the control system. The insulation of the plasma from ground was carefully treated, increasing the ratio between insulator resistance and typical plasma resistance as much as possible. Fluidynamic tests at room and high temperatures have shown that stability in the gas parameters (temperature, pressure and mass flow) can be maintained within few per cent for tens of seconds after a transient, giving a behaviour similar to a continuously running system. The high- temperature, alumina pebble-bed heater has successfully operated, bringing  More>>
Authors:
Bertolini, E.; Brown, R.; Gasparotto, M.; Gay, P.; Toschi, R. [1] 
  1. Laboratorio Conversione Diretta, CNEN, Frascati (Italy)
Publication Date:
Nov 15, 1968
Product Type:
Conference
Report Number:
IAEA-SM-107/201
Resource Relation:
Conference: Symposium on Magnetohydrodynamic Electrical Power Generation, Warsaw (Poland), 24-30 Jul 1968; Other Information: 6 refs., 21 figs.; Related Information: In: Electricity from MHD, 1968. Vol. II. Closed-Cycle MHD with Gaseous Working Fluids. Proceedings of a Symposium on Magnetohydrodynamic Electrical Power Generation| 620 p.
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ALUMINIUM OXIDES; CESIUM; CNEN; ELECTRICAL FAULTS; ELECTRODES; ENERGY CONVERSION; HELIUM; MAGNETOHYDRODYNAMICS; MAGNETS; NITROGEN; PERFORMANCE; PLASMA; PULSES; TANTALUM; TEMPERATURE RANGE 1000-4000 K; THERMAL SHOCK
OSTI ID:
22184130
Research Organizations:
International Atomic Energy Agency, Vienna (Austria)
Country of Origin:
IAEA
Language:
English
Other Identifying Numbers:
Other: ISSN 0074-1884; TRN: XA13M4320008665
Submitting Site:
INIS
Size:
page(s) 987-1015
Announcement Date:
Jan 30, 2014

Citation Formats

Bertolini, E., Brown, R., Gasparotto, M., Gay, P., and Toschi, R. Performance of the CNEN MHD Blow-Down Loop Facility. IAEA: N. p., 1968. Web.
Bertolini, E., Brown, R., Gasparotto, M., Gay, P., & Toschi, R. Performance of the CNEN MHD Blow-Down Loop Facility. IAEA.
Bertolini, E., Brown, R., Gasparotto, M., Gay, P., and Toschi, R. 1968. "Performance of the CNEN MHD Blow-Down Loop Facility." IAEA.
@misc{etde_22184130,
title = {Performance of the CNEN MHD Blow-Down Loop Facility}
author = {Bertolini, E., Brown, R., Gasparotto, M., Gay, P., and Toschi, R.}
abstractNote = {The CNEN facility has been designed, manufactured and used for alkali-seeded noble gas MHD energy conversion research, as the major experimental effort during the first five-year CNEN Research Programme on MHD. The main specifications and the general arrangement with information on preliminary commissioning tests of some components were given at the Salzburg Symposium. Since then the facility has been successfully commissioned and from March 1967 has been working on MHD experiments. Efforts were made to reduce any adverse effects on the experimental MHD results that were due to inherent limitations of an experimental apparatus (particularly under open-circuit conditions). Great emphasis was placed on problems of caesium vaporization and the mixing with helium, the purity level of the mixture, measurements and the control system. The insulation of the plasma from ground was carefully treated, increasing the ratio between insulator resistance and typical plasma resistance as much as possible. Fluidynamic tests at room and high temperatures have shown that stability in the gas parameters (temperature, pressure and mass flow) can be maintained within few per cent for tens of seconds after a transient, giving a behaviour similar to a continuously running system. The high- temperature, alumina pebble-bed heater has successfully operated, bringing the helium-caesium mixtures up to 2000 Degree-Sign K and up to 4 atm abs pressure, and undergoing seven thermal cycles, for a total of more than 2000 hours operation at top temperature. Preheated generator ducts using alumina as insulator and tantalum for electrodes performed satisfactorily, very much attention having been given in the design to reduction of thermal shocks and to obviating possible paths for caesium leakage and short-circuiting of electrode leads. The pulsed liquid nitrogen precooled magnet has been run for about 50 pulses at high field ( Asymptotically-Equal-To 4.5 tesla) with an operating time of about 10 seconds per pulse. The performance of each item and the whole performance of the facility as an experimental apparatus for closed-cycle MHD research is discussed and the technical solutions adopted for plasma insulation from ground are analysed in detail. (author)}
place = {IAEA}
year = {1968}
month = {Nov}
}