The power generation by co-firing of coal and biomass is the most economical and efficient technology for existing coal-fired power plants to achieve CO_2 emission reduction and large-scale efficient utilization of biomass. However

due to the significant alkali metal content in biomass

serious issues such as ash deposits

slagging

and corrosion arise during co-firing of coal and biomass

posing substantial threats to safe and economically viable operation of boiler equipment. Comparative analysis on slagging characteristics of heating surfaces in coal-fired boilers

biomass-fired boilers

and co-firing boilers of coal and biomass are conducted

with their influencing factors investigated. The slagging characteristic evaluating indicators for boilers firing different fuels and co-firing boilers are comprehensively discussed and evaluated. Furthermore

the applicability of these slagging evaluation indicators in specific boiler equipment is assessed. A comprehensive analysis reveals that the ash components in the fuel determine the physical and chemical properties of ash residues. The ash fusion characteristics reflect the tendency and temperature of solid-liquid transformation of ash residues

whereas ash viscosity relates to ash flowability and its propensity to deposit as slag on heating surfaces. A comprehensive consideration of these aspects enables a more accurate evaluation of boiler heating surface slagging characteristics.