An Overview of Hot Corrosion in Waste-to-Energy Boiler Environment and Its Remedies

摘要

Fireside corrosion of boiler tubes in waste-to-energy plants has been of great concern for plant operators, boiler designers, and boiler tube manufacturers since quite a few number of boiler tubes in these plants suffered from wall thinning due to hot corrosion. The corrosion problem at high temperatures is more serious due to the highly aggressive environment in waste-to-energy plants such as Cl_2, HC1, alkali metals and heavy metals. Corrosion resistant coatings are key technologies to reduce the maintenance in waste-to-energy plants by reducing the hot corrosion problem. Different corrosion resistant coatings processes have been developed such as thermal spray, HVOF, HVSFS, PVD and cold spray. Employing the corrosion resistant coatings ensure the high corrosion and wear resistant of the boiler tubes. The present paper highlights the hot corrosion in waste-to-energy plants, its effects and preventive measures.