Name : [in Japanese]
Location : [in Japanese]
Date : October 30, 2024 - October 31, 2024
Pages 22-23
Biomass generally contains higher potassium and chlorine, compared with coal. Therefore, gaseous KCl generated during combustion adheres on heat transfer tubes due to condensation. However, KCl within ash deposit concentrates at the interface between tube surface and ash deposit layer in Circulating Fluidized Bed (CFB) and/or conventional boilers. In this study, the experiments on KCl condensation, using a compressed ash pellet, showed the feasibility that gaseous KCl penetrated inside the ash deposit and condensed at the surface of heat transfer tubes. Additionally, the effects of S, Si and Ca on Cl deposit were also discussed by lab-scale ash-deposition experiments, using eight samples of coal and biomass fuels. The experimental results showed that both S and Si could reduce Cl condensation, while Ca promoted the Cl deposit on the heat transfer tubes.
