Editing Gasification (section)

===Fluidized bed reactor===
[[File:Gasification facility "Advanced Methanol Amsterdam".jpg|thumb|371x371px|Visualisation of proposed fluidized bed gasification facility in Amsterdam designed to convert waste materials into biofuels<ref>{{Cite web|url=https://www.gidara-energy.com/advanced-methanol-amsterdam|title=Advanced Methanol Amsterdam}}</ref>]]

The fuel is [[fluidization|fluidized]] in oxygen and steam or air. The ash is removed dry or as heavy agglomerates that defluidize. The temperatures are relatively low in dry ash gasifiers, so the fuel must be highly reactive; low-grade coals are particularly suitable. The agglomerating gasifiers have slightly higher temperatures, and are suitable for higher rank coals. Fuel throughput is higher than for the fixed bed, but not as high as for the entrained flow gasifier. The conversion efficiency can be rather low due to [[elutriation]] of carbonaceous material.  Recycle or subsequent combustion of solids can be used to increase conversion. Fluidized bed gasifiers are most useful for fuels that form highly corrosive ash that would damage the walls of slagging gasifiers. Biomass fuels generally contain high levels of corrosive ash.

Fluidized bed gasifiers uses inert bed material at a fluidized state which enhance the heat and biomass distribution inside a gasifier.  At a fluidized state, the superficial fluid velocity is greater than the minimum fluidization velocity required to lift the bed material against the weight of the bed. Fluidized bed gasifiers are divided into Bubbling Fluidized Bed (BFB), Circulating Fluidized Bed (CFB) and Dual Fluidized Bed (DFB) gasifiers.