Improvement of service life of turbine blade in wet region T-S-002

Mar. 12, 2012
T-S-002 / 766-90172

REASON FOR SUGGESTION:

A condensing turbine being operated in a wet steam region may have its blade surface erosion due to drain produced during long-term operation, leading to an accident of broken blade(s) in a worst case as well as reduction in efficiency.

DETAILS OF SUGGESTION:

Replace the blades (application limit of blade height : 200 mm) in a relatively high wet (＜10%) stage with those so-called ceramic-ion plated which are Nitrided titanium (TiN)-top coat and chrome (Cr)-under coat. Thereby, higher erosion resistance and longer service life will be obtained.