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Chemical fractionation of inorganic constituents in entrained flow gasification of slurry from straw pyrolysis

Mielke, Konrad; Kolb, Thomas; Müller, Michael

Abstract (englisch):
Pressurized entrained-flow gasification (PEFG) of straw biomass is currently being studied as a potentially sustainable
and economically viable process to produce fuels and other vital chemicals. In the process chain the
gasification is integrated and straw is converted via pyrolysis into a bioslurry consisting of a liquid, tar-rich phase
and char. Afterwards, the slurry is gasified into a tar-free, low-methane syngas which is a basic reactant for the
synthesis of biofuels. At the high temperatures over 1200 ◦C the ash constituents of the char in the bioslurry melt
and flow down the inner wall as slag. The slag viscosity has to be in a certain range to form a protective layer at
the reactor wall and to guarantee a continuous removing. For this reason, the composition of the molten ash at
the reactor wall has to be well known. Due to several fractionation processes in the gasifier the composition of
the slag at the reactor wall does not correspond directly with the slurry ash. Therefore, experiments were conducted
to identify depletion and enrichment processes in the gasifier. Finally, the composition of the slag at the
reactor wall is obtained and can be used for the adjustment of the viscosity.

Zugehörige Institution(en) am KIT Engler-Bunte-Institut (EBI)
Institut für Technische Chemie (ITC)
Publikationstyp Zeitschriftenaufsatz
Publikationsmonat/-jahr 10.2020
Sprache Englisch
Identifikator ISSN: 0961-9534
KITopen-ID: 1000123308
HGF-Programm 34.14.02 (POF III, LK 01) Vergasung
Erschienen in Biomass and bioenergy
Verlag Elsevier
Band 141
Seiten Art.-Nr. 105732
Vorab online veröffentlicht am 27.08.2020
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