Research on formation mechanism of typical low-temperature fouling layers in biomass-fired boilers

Abstract

Ash deposition in flue gas covering low-temperature surfaces (120 °C), multi-loose ash layer (120-90 °C), adhering ash layer (90-60 °C), and viscous ash layer (<60 °C). In order to study the formation mechanism of typical low-temperature fouling layers, the following analyses were performed: the boundary temperature of NH4Cl crystallization was calculated, the condensations of H2SO4 and HCl were analyzed, critical deliquescence temperatures (CDTs) of deliquescent chlorides were calculated, and water uptake of deliquescent chlorides under different temperatures and moisture were proposed.

Keywords

• Biomass-fired boilers
• Typical ash layer
• NH4Cl crystallization
• Condensation
• Deliquescent chlorides
• Critical deliquescence temperature