NTF,Dept. of Geot.,Mini. and Enviro.,Dept. of Mat. Sci. and Metal.,Lj. (NTFGRM)
13.
Erozijske poškodbe zaradi mokre pare na grelniku napajalne vode v NE Krško = Erosion damages due to wet steam on feed water heat exchanger in the Krško nuclear power plant
Lovrenčič, Peter ; Vojvodič-Tuma, Jelena ; Celin, Roman
V Nuklearni elektrarni Krško se napajalna voda segreva v regenerativnih grelnikih. To so prenosniki toplote, v katerih teče napajalna voda skozi cevi, okrog cevi pa para, ki je bila na primernem ...mestu odvzeta iz parne turbine. Ta turbinska para vsebuje približno 5 do 12 % vode v obliki drobnih kapljic. Mokra para udarja na vhodu v regenerativni grelnik s hitrostjo 10 do 20 m/s na posebno ploščo, ki ščiti cevi. Tok pare se nato odbije nazaj na plašč regenerativnega grelnika in kondenzira. V NEK erozijsko delovanje mokre pare skrbno spremljajo in na izbranih mestih periodično merijo debelino plašča grelnika. V zadnjih letih so ultrazvočne meritve pokazale, da se debelina plašča okrog priključka cevovoda grelne pare približuje minimalni dopustni, zato je bil med remontom 2001 del plašča izrezan in zamenjan z novim.
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