ISSN:
1573-4889
Schlagwort(e):
Hot corrosion
;
B-1900
;
fluidized bed coal combustor
Quelle:
Springer Online Journal Archives 1860-2000
Thema:
Maschinenbau
Notizen:
Abstract Calcium sulfate deposits in fluidized bed coal combustors are thought to contribute to heat transfer tube hot corrosion observed in test beds. Although Na2SO4 caused catastrophic hot corrosion of B-1900 superalloy at 900°C in air, the corrosion due to CaSO4/Na2SO4 mixtures resembled that of simple oxidation, both in scale appearance and kinetics. High scale calcium content suggested a solid state reaction with CaSO4 that did not compromise the protective scale. Although trace vanadium pentoxide added to a high percentage CaSO4 mixture was shown to be innocuous, trace lead oxide caused catastrophic hot corrosion. However, the mechanism is unknown. This suggests that the latter coal impurity warrants attention as a possible severe corrosive threat, although CaSO4 itself appears innocuous in an oxidizing environment.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1007/BF00662036
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