Since the fuel ash and its composition directly affect the gassolids
flow and the conditions in the vicinity of heat exchanger
surfaces and since almost 50% of heat transfer surface failures in
power boilers are associated with malfunctioning of superheaters it
is important for each individual boiler to investigate the potential
effect of the addition of any new fuel on possible increase of solids
accumulation and decrease of the heat transfer rate and tube
damage. Those aspects have to be particularly carefully investigated
when co-combustion of various fuels with coal is performed since
in such case the probability to form any eutectic mixture on the
steel surfaces is significantly increased