Fluidized Bed Combustion and Gasification of Biomass Fuels

Fluidized bed technologies harness the dynamic suspension of solid particles by an upward flow of gas or steam to achieve efficient heat and mass transfer during the thermochemical conversion of biomass. In combustion mode, bubbling and circulating fluidized beds accommodate a wide variety of feedstocks—from woody residues to agricultural by-products—while maintaining uniform temperatures and low emissions of nitrogen oxides and particulate matter. Gasification, often realised in dual fluidized bed reactors, employs partial oxidation and steam or oxygen carriers to convert solid biomass into a mixture of hydrogen, carbon monoxide and light hydrocarbons (syngas). This syngas can be upgraded to heat, power, biofuels or chemical intermediates, supporting decarbonisation of power, transport and industrial sectors. Key challenges include ash-induced agglomeration, tar formation and bed material degradation, which influence operational stability and product quality. Advances in bed material engineering, process staging and catalyst incorporation are enhancing conversion efficiency and durability. The global imperative to transition to renewable energy has placed fluidized bed conversion at the forefront of sustainable biomass utilisation, offering modular solutions for both large-scale power plants and decentralised heat networks.

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Fluidized Bed Combustion and Gasification of Biomass Fuels publication trend

The graph below shows the total number of articles in fluidized bed combustion and gasification of biomass fuels across all publications each year (not limited to Nature Index journals).

Technical terms

Fluidized bed: A reactor regime in which solid particles are suspended by an upward gas or steam flow, promoting intense mixing and uniform temperature.

Bubbling fluidized bed (BFB): A fluidized bed operating at low gas velocities where gas bubbles rise through the particle bed, used for combustion and gasification.

Circulating fluidized bed (CFB): A higher‐velocity fluidized bed in which particles entrain and recirculate, offering enhanced heat transfer and scale‐up potential.

Dual fluidized bed gasification (DFB): A configuration with separate combustion and gasification chambers, exchanging bed materials to supply heat and oxygen, producing tar‐lean syngas.

Agglomeration: The undesirable sticking or clumping of bed particles due to ash melting, leading to defluidisation and operational instability.

Oxygen carrier: A solid material (often metal oxide) that transfers oxygen in chemical looping processes, enabling decoupled combustion and gasification reactions.

References

1. Agglomeration behaviour of various biomass fuels under different air staging conditions in fluidised bed technology for renewable energy applications. Renewable Energy (2024).
2. Role of Particle Geometry on the Structural Integrity of Sand and Rock Ilmenite Used as Oxygen Carrier in Combustion of Woody Biomass. Energy & Fuels (2024).
3. Surface characterization of ash-layered olivine from fluidized bed biomass gasification. Biomass Conversion and Biorefinery (2020).