Mass transfer of corrosion products in high temperature, high pressure water circuits, part 2 - preliminary experiments

Simple item page
dc.contributor.authorEvans, JVen_AU
dc.contributor.authorNicholson, FDen_AU
dc.date.accessioned2007-11-22T04:25:52Zen_AU
dc.date.accessioned2010-04-30T04:37:06Zen_AU
dc.date.available2007-11-22T04:25:52Zen_AU
dc.date.available2010-04-30T04:37:06Zen_AU
dc.date.issued1976-07en_AU
dc.description.abstractThe behaviour of iron oxide crud was studied at 25ºC and over the range 240 to 270ºC in a high pressure water loop. Crud deposition and removal was measured in two parallel, heated Zircaloy-2 tubes using iron-59 as a radioactive tracer. This proved to be a powerful technique capable of detecting crud deposits less than 3 run thick. Rapid deposition of crud was observed following injection into the loop of an iron oxide suspension or a ferric nitrate solution. Crud deposited preferentially on heated surfaces when they were present but not to the exclusion of deposition elsewhere; hot spots on heated surfaces attracted additional deposits. Subcooled boiling appeared to be a more important factor than bulk boiling in the enhancement of crud deposition. The initial rapid deposition of the bulk of the crud throughout the loop was usually followed by a slower transfer of crud from other surfaces to any heated surface present. Unsteady operating conditions, e.g. a change in power, temperature or pH, frequently caused crud bursts, but once steady conditions were re-established the entrained crud was quickly redeposited. The bulk of deposited crud was not readily re-entrained, particularly from heated surfaces, so that crud bursts involved only a fraction of the total crud deposited. Ferric nitrate solutions injected into the loop formed haematite which deposited more slowly and formed more mobile deposits than magnetite which was injected directly into the loop as a slurry. Examination of deposits from both sources showed them to be even and tightly adherent, being removed only with difficulty.en_AU
dc.identifier.citationEvans, J. V., & Nicholson, F. D. (1976). Mass transfer of corrosion products in high temperature, high pressure water circuits part 2, preliminary experiments (AAEC/E376). Lucas Heights, N.S.W.: Australian Atomic Energy Commission Research Establishment.en_AU
dc.identifier.govdoc594en_AU
dc.identifier.isbn0642997373en_AU
dc.identifier.otherAAEC-E-376en_AU
dc.identifier.placeofpublicationLucas Heights, New South Walesen_AU
dc.identifier.urihttp://apo.ansto.gov.au/dspace/handle/10238/584en_AU
dc.language.isoen_auen_AU
dc.publisherAustralian Atomic Energy Commissionen_AU
dc.subjectPrimary coolant circuitsen_AU
dc.subjectSubcooled boilingen_AU
dc.subjectMass transferen_AU
dc.subjectpH valueen_AU
dc.subjectDepositionen_AU
dc.titleMass transfer of corrosion products in high temperature, high pressure water circuits, part 2 - preliminary experimentsen_AU
Files
Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
AAEC-E-376.pdf
Size:
1.24 MB
Format:
Adobe Portable Document Format
Description:
Download
Collections
Scientific and Technical Reports