Title:
Characterization of Flue Gas Composition from Combustion of Vapours from Pyrolysis of Residual Forest Biomass in a Prototype of Auger Reactor
Author(s):
Tarelho, L.A.C., Santos, M.C., Marques, C.C., Silva, F.G.C.S., Matos, M.A.A.
Document(s):
Paper
Poster
Abstract:
It was studied the combustion of vapours from pyrolysis of residual forest biomass in a prototype of Auger reactor integrated with a downstream combustion reactor for pyrolysis vapours. Biomass from acacia, gorse, broom, giant reed, and olive bagasse was pyrolyzed in the Auger reactor at 550ºC and with solids residence time between 5 and 7.5 minutes, and the resulting vapours burned in the combustion reactor. The biochar yield was in range 0.24 to 0.30 kg/kg biomass (dry basis), and the biochar Carbon concentration was in range 0.76 to 0.81 kg/kg biochar (dry basis). The combustion of pyrolysis vapours, and in particular the stability and the temperature of the flame, is strongly influenced by a stable feeding of biomass to the pyrolysis reactor. Temperatures in the combustion chamber in the range 550ºC to 1050ºC were observed depending on the biomass type used. An efficient combustion of pyrolysis vapours was observed, as reflected by the relatively low concentration (below 600 mg/Nm3, corrected to 6% O2, dry gas) of CO observed in the exit flue gas. However, relatively high concentrations of NO (expressed as NO2, up to 1920 mg NO2/Nm3, corrected to 6% O2, dry gas) were observed as also relatively high concentrations of HCl (up to 490 mg HCl/Nm3, corrected to 6% O2, dry gas) for some biomass types. The subject of NO and HCl emissions needs to be analysed in further studies in order to improve the performance of the combustion of pyrolysis vapours.
Keywords:
biomass, combustion, pyrolysis, biochar, gas
Topic:
Biomass Conversion to Intermediate Bioenergy Carriers and Sustainable Biofuels
Subtopic:
Pyrolysis
Event:
31st European Biomass Conference and Exhibition
Session:
5BV.8.7
Pages:
934 - 942
ISBN:
978-88-89407-23-3
Paper DOI:
10.5071/31stEUBCE2023-5BV.8.7
Price:
FREE
