To solve the problems of fouling

slagging

and high-temperature corrosion in an ultra supercritical 1 000 MW unit boiler fueled by Zhundong coal

engineering verification test of nano-high-entropy ceramic coating in separated over fire air(SOFA) area of the boiler rear water wall was carried out

based on the coal characteristics

slagging condition and corrosion type of the boiler. Several methods such as macrographic check

scanning electron microscope(SEM)

X-ray diffraction(XRD)

Raman spectrum

friction coefficient and surface energy test were applied to observe the change of nano-high-entropy ceramic coating before and after experiments

thus to reveal the possible slag resistance and corrosion resistance mechanisms of nano-high-entropy ceramic coating. The results show that

the coating remained intact after 11 months' boiler operation

with no obvious slagging and corrosion pits on the surface and no significantly thinning of the pipe wall. Nano-high-entropy ceramic coating can better solve the problems of fouling

slagging and high-temperature corrosion on the boiler water wall

which provides a guarantee for safe operation of the boiler fueled by Zhundong coal.