Hydrothermal carbonization and torrefaction of cabbage waste
Laen...
Kuupäev
2019
Kättesaadav alates
Autorid
Tamelová, B.
Malaťák, J.
Velebil, J.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
In recent years, waste biomass has been increasingly becoming an energy source. The
utilization of biomass includes a number of potential treatments: thermochemical,
physicochemical and biochemical. In the food industry, significant amounts of biodegradable
wastes are produced which have to be quickly treated to not pose an environmental problem. In
this work cabbage waste (Brassica oleracea var. capitata) was treated by hydrothermal
carbonization and torrefaction.
Hydrothermal carbonization experiments were carried out in a pressure reactor vessel
Berghof BR-300 (inner volume 400 mL, temperature regulation by Berghof BTC 3000). The
carbonization took place at target temperatures 180 °C and 225 °C. Torrefaction tests were
carried out in a thermogravimetric programmable oven LECO TGA701 under nitrogen
atmosphere at temperatures 225 °C, 250 °C and 275 °C. The residence time was 30 min for both
processes. Proximate and elemental composition, as well as calorific value was analysed in all
samples. To express the influence of the treatments on combustion behaviour, stoichiometric
combustion calculations were performed.
The analyses show a positive effect of both torrefaction and hydrothermal carbonization on fuel
properties in the samples. Most obvious is the reduction in oxygen content which depends on the
process temperature. After hydrothermal carbonization at 225 °C the oxygen content was lowered
by 46.7%. The net calorific value increased proportionally with temperature in both processes.
After hydrothermal carbonization at 225 °C the net calorific value increased on average by
3 MJ kg-1
to 20.89 MJ kg-1
. Both tested processes significantly increased the fuel value of this
biodegradable waste.
Kirjeldus
Article
Märksõnad
biomass, biochar, elemental analysis, energy properties, articles