A utility boiler in Brazilhave has the similar type and similar design coals as a unit boiler in Qitaihe

China

but the wear problem in the Brazil boiler is far more serious. The on-site sampling and ash sample detection for the above two boilers show that

the wear of the Brazil boiler was mainly caused by fly ash with large particle size. Then

the causes of the formation of large particles and the deposition process were analyzed. The results show that

the key location where large particle fly ash formed is near the horizontal flue. The interaction between sulfur and iron and that between calcium and iron promoted the formation of large particle fly ash. It suggests that

the ignition of ferrite type high sulfur coal should be strengthened to reduce the mass concentration of adhesive co-melt particles in horizontal flue. Or

wash the Brazilian coal to reduce its mineral impurity content

especially minerals containing silicon

aluminum and iron

thus to alleviate the wear of heating surface.