The boiler has five rows of six burners on two sides. These burners are fed with coal, bio-propane, wood, and MBM (Meat and Bone Meal) - animal residue foam injected into the boiler. MBM is very erosive, so the flow is deviated by a deflector plate in the burner, however, the spray still impacts on the opposite wall generating localized erosion and corrosion due to a small deposits on the wall facing the MBM burners.
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