The Effect of Atmosphere Gas on Hot Erosion Properties of the Materials Applied to PFBC Boiler
Keiji SONOYA, Hiroyuki ISOO
Three kinds of materials applied to PFBC boiler have been examined in the atmosphere of the mixed gas (N2-O2-SO2), and the effect of atmosphere gas on hot erosion waste of the materials was studyed. The results obtained are as follows.
(1) The erosion waste of materials is accelerated by SO2, and is restrained by O2.
(2) The erosion waste is small on the condition of low testing velocity below 7m/s.
The erosion waste becomes larger in proportion to the increase of the testing velocity on the condition of the high velocity beyond 7m/s.
(3) The erosion waste becomes smaller at larger Cr content because of a formation of Cr oxide at the most inner layer of an oxide scale.