TY - JOUR
T1 - Impact of HTC reaction conditions on the hydrochar properties and CO2 gasification properties of spent grains
AU - Ulbrich, Markus
AU - Preßl, Dieter
AU - Fendt, Sebastian
AU - Gaderer, Matthias
AU - Spliethoff, Hartmut
N1 - Publisher Copyright:
© 2017 Elsevier B.V.
PY - 2017
Y1 - 2017
N2 - The impact of residence time and temperature during hydrothermal carbonization (HTC) on hydrochar properties and CO2 gasification properties has been studied for brewers' spent grain (BSG), treated at temperatures from 180 °C to 280 °C and residence times from 0.5 to 12 hours. Lower heating values (LHV) of the hydrochars are found to increase to values of bituminous coal and anthracite as reaction severity increases. Temperature is found to have a greater influence on the LHV of the hydrochar than residence time. Mass and energy yields decrease with increasing reaction severity. With higher reaction severity decreased molar O/C and H/C ratios as well as decreased volatile contents and increased fixed carbon contents are observed. The influence of residence time is more pronounced for the formation of fixed carbon, main carbonization reactions occur for a reaction severity greater than 180 °C and 0.5 hours. Char reactivity is found to decrease with increasing carbonization reaction severity with a strong influence of both residence time and temperature due to the formation of fixed carbon in the hydrochar. Activation energies are decreased with increased carbonization temperature but only mildly affected by residence time. Hereby the catalytic influence of ash compounds has to be further determined.
AB - The impact of residence time and temperature during hydrothermal carbonization (HTC) on hydrochar properties and CO2 gasification properties has been studied for brewers' spent grain (BSG), treated at temperatures from 180 °C to 280 °C and residence times from 0.5 to 12 hours. Lower heating values (LHV) of the hydrochars are found to increase to values of bituminous coal and anthracite as reaction severity increases. Temperature is found to have a greater influence on the LHV of the hydrochar than residence time. Mass and energy yields decrease with increasing reaction severity. With higher reaction severity decreased molar O/C and H/C ratios as well as decreased volatile contents and increased fixed carbon contents are observed. The influence of residence time is more pronounced for the formation of fixed carbon, main carbonization reactions occur for a reaction severity greater than 180 °C and 0.5 hours. Char reactivity is found to decrease with increasing carbonization reaction severity with a strong influence of both residence time and temperature due to the formation of fixed carbon in the hydrochar. Activation energies are decreased with increased carbonization temperature but only mildly affected by residence time. Hereby the catalytic influence of ash compounds has to be further determined.
KW - Biomass pretreatment
KW - CO gasification
KW - Gasification kinetics
KW - Hydrothermal carbonization
KW - Renewable energies
UR - http://www.scopus.com/inward/record.url?scp=85027493048&partnerID=8YFLogxK
U2 - 10.1016/j.fuproc.2017.08.010
DO - 10.1016/j.fuproc.2017.08.010
M3 - Article
AN - SCOPUS:85027493048
SN - 0378-3820
VL - 167
SP - 663
EP - 669
JO - Fuel Processing Technology
JF - Fuel Processing Technology
ER -