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@PHDTHESIS{Kopsch:1006938,
author = {Kopsch, Markus},
othercontributors = {Müller, Michael and Peschel, Andreas},
title = {{I}norganic trace substances in a sorption enhanced
gasification process and their removal},
school = {Rheinisch-Westfälische Technische Hochschule Aachen},
type = {Dissertation},
address = {Aachen},
publisher = {RWTH Aachen University},
reportid = {RWTH-2025-02830},
pages = {1 Online-Ressource : Illustrationen},
year = {2024},
note = {Veröffentlicht auf dem Publikationsserver der RWTH Aachen
University 2025; Dissertation, Rheinisch-Westfälische
Technische Hochschule Aachen, 2024},
abstract = {The energy supply by biomass, especially by biomass
residues, currently enjoys high acceptance among the German
population due to the energy crisis. A process that enables
the use of biomass residues for power generation is the
Ca-looping gasification process proposed in the European
GICO-Project. This process requires a hot gas conditioning
(HGC) unit for a gasifier and a calciner to remove inorganic
trace substances. To this end, extensive equilibrium
calculations with FactSage were conducted for the GICO
gasifier (650 °C), and calciner (920 °C), showing that
aluminosilicates, Sr-, and Ba-based sorbents could reduce
the alkali, respectively sour gas (H2S/SO2, HCl)
concentration to sub ppmv levels. Condensation calculations
reveal the need for temperature-resistant H2S sorbents since
conventional ones, e.g. Zn2TiO4, tend to evaporate, leading
to the condensation of unwanted salts, and oxides. Since the
release behavior of inorganic trace species and their
adsorptive removal under gasification-like conditions
between 650 °C and 700 °C has hardly been investigated,
the experimental focus of this work is placed on the
gasifier operating at 650 °C. The release behavior of
inorganic trace substances from raw, water-leached, and
hydrochar biomass samples was investigated using molecular
beam mass spectrometry (MBMS). The sorption capacity of
aluminosilicates, alkaline earth, and rare earths-based
sorbents was determined by mass spectrometry (MS) in fixed
bed lab-scale investigations. The investigations showed that
aluminosilicates are suitable for alkali removal.
Furthermore, the results indicate that Ca-stabilized Sr- and
Ba-sorbents reduce H2S sufficiently. In both cases,
concentrations could be brought below 1 ppmv. Compatibility
experiments between filter material (Al- and Ca-Mg-silicate
fibers) and sorbents were conducted to investigate the
possibility of integrating the sorbents into the filter
candles in order to allow a more compact HGC design. Since
the Zn-sorbents are not reacting with the filter candle
material, they can be integrated into the filter candle.
However, aluminum- and silicate-phases are formed when using
Sr- and Ba-based sorbents leading to potential risks such as
the formation of cracks. Based on the modeling calculations,
release, sorption, and compatibility experiments, chemical
HGC concepts for different sorbents are proposed.},
cin = {413410 / 057700},
ddc = {620},
cid = {$I:(DE-82)413410_20140620$ / $I:(DE-82)057700_20231115$},
pnm = {GICO - Gasification Integrated with CO2 capture and
conversion (101006656)},
pid = {G:(EU-Grant)101006656},
typ = {PUB:(DE-HGF)11},
doi = {10.18154/RWTH-2025-02830},
url = {https://publications.rwth-aachen.de/record/1006938},
}
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