Design and operation of a gas cleaning system for biomass gasification in a two-stage air-blown downdraft gasifier to meet quality requirements of solid oxide fuel cells

A comprehensive review of primary strategies for tar removal in biomass gasification

“…Regarding the different reactor configurations based on fixed beds, Bui et al [332] developed the two-stage throatless reactor combining two single-stage downdraft gasifiers (one above the other) and reported that tar content was about 40 times lower (about 50 mg Nm − 3 ) than for a single-stage reactor operating under similar conditions. More recently, Restrepo et al [333] designed, built and operated a 50 kWe two-stage downdraft gasifier with an extensive gas cleaning system, and reported that the quality of the gas is good enough for use in SOFCs. Sulc et al [334] also used a fixed-bed based reactor arrangement, but in this case the first stage was an updraft fixed bed reactor.…”