Research of Slag Accumulation Reduced by Hydrogen in Circulation Circuits with Lead-Containing Heat Carriers View Full Text


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Article Info

DATE

2021-11-03

AUTHORS

V. V. Ul’yanov, M. M. Koshelev, Yu. A. Teplyakov

ABSTRACT

A thermodynamic analysis into the processes of slag accumulation during interaction of lead and lead-bismuth coolants with gaseous oxidants was carried out. It is shown that the oxidation of lead-containing coolants will lead to the formation of lead oxide, while the formation of bismuth oxide is unlikely. The possibility of selective oxidation of iron, chromium, and nickel to their oxides without the formation of slag from solid lead oxide with a dosed supply of a gaseous oxidizer to lead-containing coolants has been determined by calculation. It was revealed that the formation of solid lead oxide is unlikely when water vapor acts on lead-containing coolants. The calculation showed that it is necessary to extract the formed hydrogen from water vapor to a ratio of 1 : 20 000 or less in order to create conditions for the formation of solid lead oxide. The regularities of the formation of lead oxide during depressurization of a circuit with a lead-containing coolant and their interaction with atmospheric oxygen have been investigated. According to the results of the experiment, the largest amount of solid PbO is formed upon contact with oxygen in a circuit not filled with a coolant and cooled to ambient temperature. Short-term depressurization of the loop in the hot state led to the formation of a smaller mass of PbO, and the presence or absence of a coolant in the loop had an insignificant effect on the mass of the PbO formed. The possibility for the formation of solid PbO during a microleak of a steam generator in the TT-2M stand with a Pb–Bi coolant has been investigated. Under the experimental conditions, it was not possible to obtain solid lead oxide, and the achieved limiting content of dissolved lead oxide turned out to be 550 times less than the saturation concentration. More... »

PAGES

848-855

Identifiers

URI

http://scigraph.springernature.com/pub.10.1134/s0040601521100074

DOI

http://dx.doi.org/10.1134/s0040601521100074

DIMENSIONS

https://app.dimensions.ai/details/publication/pub.1142368471


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