Title:
Characteristics of Producer Gas and Ash during Biomass (Direct) Gasification in an Autothermal Pilot-Scale Bubbling Fluidized Bed Reactor
Author(s):
Tarelho, L.A.C., Ribeiro, J.P.S.P.O., Pio, D.T., Ribeiro, C.A.R., Matos, M.A.A.
Document(s):
Paper
Poster
Abstract:
Results from direct biomass gasification with air in an autothermal pilot-scale bubbling fluidized bed reactor are presented. The fluidized bed was operated with temperatures in the range 790ºC to 870ºC. For the operating conditions used, namely equivalence ratio in the range 0.21 to 0.35, the dry gas composition was 11.3 to 17.2%v CO, 2.8 to 5.0%v CH4, 1.0 to 2.2%v C2H4 and 5.8 to 12.7%v H2. The higher concentration of combustible gases, in particular H2, was observed during gasification of wood pellets, and for an equivalence ratio of 0.24. The lower heating value of the dry gas was in range 3.8 MJ/Nm3 to 6.1 MJ/Nm3, with the higher values observed for wood pellets and lower equivalence ratios. The bottom bed particles showed to have catalytic effect to improve producer gas quality, namely in terms of H2. The bottom bed ash show a composition that reflects the original sand bed (silica sand) properties, showing small concentration of inorganic chemical elements typical of the biomass (Ca, K, Na). The fly ash also show Si as the most abundant element, although the chemical elements typical of the biomass are present in relative higher amount when compared to bottom ash, being Ca or K the second most abundant.
Keywords:
biomass, gasification, fluidized bed, ashes
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Gasification for power, CHP and polygeneration
Event:
23rd European Biomass Conference and Exhibition
Session:
2DV.1.10
Pages:
780 - 791
ISBN:
978-88-89407-516
Paper DOI:
10.5071/23rdEUBCE2015-2DV.1.10
Price:
FREE
