The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering
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May 13-17, 2007
Steam gasification of solid biomass yields high quality producer gases that can be used for efficient combined heat and power production (CHP) and as a renewable resource for chemical syntheses. The dual fluidized bed steam gasification technology provides the necessary heat for steam gasification by circulating hot bed material that is heated in a second fluidized bed reactor by combustion of residual biomass char. The hydrogen content in producer gas of such gasifiers is about 40 vol% (dry basis). Addition of carbonates to the bed material and adequate adjustment of operation temperatures in the reactors allow selective transport of CO2 from gasification to combustion zone (Adsorption Enhanced Reforming – AER concept). An 8 MW (fuel power) CHP plant successfully demonstrates gasification in Guessing, Austria since 2002. A pilot plant (100 kW fuel power) has been recently operated to investigate the potential of the selective CO2 transport achieving a H2 content of 75 vol% (dry basis) in the producer gas. No significant increase in tar formation occurs despite the low gasification temperatures (600-700 °C). It can be shown, that the selective transport of CO2 yields high hydrogen contents in the producer gas and the possibility of operating at lower temperatures increases the efficiency of energy conversion.
Christoph Pfeifer, Tobias Pröll, Bernhard Puchner, and Hermann Hofbauer, "H2-Rich Syngas from Renewable Sources by Dual Fluidized Bed Steam Gasification of Solid Biomass" in "The 12th International Conference on Fluidization - New Horizons in Fluidization Engineering", Franco Berruti, The University of Western Ontario, London, Canada; Xiaotao (Tony) Bi, The University of British Columbia, Vancouver, Canada; Todd Pugsley, University of Saskatchewan, Saskatoon, Saskatchewan, Canada Eds, ECI Symposium Series, (2007). http://dc.engconfintl.org/fluidization_xii/109