A comparative evaluation of waste wood and herbaceous biomass fireside corrosion behaviours

Biomass/biomass waste (BBW) is a renewable energy source fired in combustion power plants. However, challenges associated include accelerated ‘fireside’ corrosion of heat exchangers. Fireside fuel dependent, e.g. virgin wood fuels have lower fireside risks; as such their demand and cost high. Waste (WWF) herbaceous grass biomass (HGB), generate different environments, influencing exchanger damage. This paper compares the WWF HGB to improve understanding attack mechanisms on T91 374HFG. The species generated been investigated by thermodynamic modelling. Corrosion damage has evaluated high temperature furnace tests at 600 °C, employing well-established deposit recoat method based these evolved species. Vapour condensation fluxes compared for both categories; rates increase with this flux. Deposition from are higher than WWF. For example, average KCl deposition calculated 1566 µg/cm2h 295 per kg feed respectively, explaining comparatively greater experienced plants combusting fuels. chemistries also different: K-containing compounds only (for fuels) versus K-, Na- Ca-containing WWF). Evaluation corroded samples exposed show increased steels under simulated firing conditions matched flux (100 µg/cm2h).