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Reaction Kinetics and Reactive Surface Area during Gasification of High-Temperature Biomass Char with CO2

Schneider, Christoph; Stoesser, Philipp; Rincon, Sonia; Kolb, Thomas

Abstract (englisch):
High pressure entrained-flow gasification is an essential step of the bioliq® process chain. In this BtL process, a suspension fuel (slurry) produced from biomass in a fast pyrolysis process is converted to syngas in an oxygen/steam blown entrained flow gasifier (EFG). During the gasification process the slurry undergoes different processes, i.e. evaporation of the liquid phase, rapid char heat-up, secondary pyrolysis of char and char gasification in a CO2- and H2O-rich atmosphere. The latter is the rate-limiting step; thus kinetic data for secondary char gasification is needed for reactor design.
The lab scale experiments presented are designed to simulate the typical reaction conditions a char particle has to undergo in the EFG process, i.e. secondary pyrolysis is conducted applying high heating rates and temperatures. The determination of heterogeneous reaction kinetics of the so produced secondary char with CO2 and H2O as well as first results on the development of morphology and surface chemistry of the secondary char particle are reported.
Secondary pyrolysis of bio-char was carried out in a drop-tube furnace at KIT. Pyrolysis was conducted in nitrogen under atmospheric pressure at 1600 °C and a residence time of 200 ms. ... mehr

Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie (ITC)
Publikationstyp Vortrag
Publikationsdatum 15.02.2018
Sprache Englisch
Identifikator KITopen-ID: 1000080313
HGF-Programm 34.14.04 (POF III, LK 01)
Brennstoffcharakterisierung und Design
Veranstaltung 2nd International Workshop on Oxy-Fuel Combustion, Bochum, 14. - 15.02.2018
Projektinformation HVI GasTech (HGF, HGF IVF, VH-VI-429)
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