Short Communication Defluidization Using High-Alkali Content Fuels in Fluidized Bed Biomass Gasifiers

Abstract

A major problem however often encountered in fluidized beds is bed agglomeration, which may result in total defluidization, leading to unscheduled downtime and additional costs. This problem is found to be critical in fluidized bed combustion and gasification of biomass fuels which have high ash and alkali contents [1]. Biomass fuels, especially herbaceous plants, often contain significant amounts of silicon, potassium and calcium, together with chlorine and sulphur. These elements tend to form viscous melts which adhere on the surface of the colliding bed particles.When the sticky bed particles collide, the viscous material at the point of contact migrates forming a neck, thus binding the particles to form agglomerates. This phenomenon is called viscous flow sintering.

Cite this Article

Vikas Narayan, Peter Arendt Jensen, Ulrik Birk Henriksen, Peter Glarborg, Weigang Lin, Rasmus Glar Nielsen. Short Communication: Defluidization Using High-Alkali Content Fuels in Fluidized Bed Biomass Gasifiers. Journal of Modern Chemistry & Chemical Technology. 2016; 7(1): 95–98p.