High temperature corrosion of superheater materials below deposited biomass ashes in biomass combusting atmospheres

摘要

The aim of this work is to investigate the corrosion behaviour of superheater materials below deposited ashes in biomass combusting atmospheres. The materials were exposed in three different settings (without deposits, with filter ash and with cyclone ash). Exposure tests were carried out with variation of water and HCl content for 360 h at 535 deg C. The HCl addition led to higher mass losses of materials than those without HCI addition. The rate of mass loss is proportional to the deposition aggressiveness and water content in the HCl containing atmospheres. NiCr rich superalloys are more resistant than austenitic and ferritic steels.