A moving-bed gasifier with internal recycle of pyrolysis gas

Authors: Herri Susanto^a, Antonie A.C.M. Beenackers^∗

A co-current moving bed gasifier with internal recycle and separate combustion of pyrolysis gas has been developed with the aim of producing a design suitable for scaling-up downdraft gasifiers while maintaining a low tar content in the producer gas. Using wood chips with a moisture content of 7–9 wt% (db) as a fuel at a rate of 20 kg h⁻¹, this system produced a gas with a heating value of 4500 kJ m_s⁻³ and a very low tar content of < 0.1 gm_s⁻³.