Dr. Matthias KUBA

Head of the Unit Fluidized Bed Technology at BIOENERGY 2020+ GmbH, Austria


Talk Title
Increasing the catalytic activity of the bed particle surface through interaction with biomass ash in fluidized bed gasification
Talk Abstract
Awareness of the consequences of climate change is leading to development of technologies using renewable sources to cover the global demand of energy. Biomass is the only renewable carbon source and as such CO 2 -neutral. A dual fluid bed gasification system was developed at the TU Wien. Separation of endothermic gasification from exothermic combustion is the main principle of this technology. This is realized by two separate reactors, connected with each other through a circulating bed material, which acts as heat carrier and catalyst in the process. Combustion provides the heat necessary for gasification. This innovative technology is not only capable of generating electricity and heat but also fuels for transportation and synthetic chemicals. Previous studies showed a modification of the bed material due to its interaction with biomass ash and additives. Especially for residual biomass of lower quality, the ash becomes more dominant in the reator. This interaction of ash and bed material results in the formation of calcium-rich layers on the bed material. Both positive and negative consequences of this layer build-up have been investigated in detail. It could be proven that on the one hand inorganic components involved in the interaction between bed material and biomass ash are critical regarding deposit build-up, especially when foreign matter such as quartz is brought into the fluidized bed together with the feedstock. Further utilization of valuable biomass ash components is highly dependent on this interaction of inorganic components in the process. Improving the management of inorganic streams and controlling temperatures is essential for long-term operation. On the other hand the layer formation leads to an enhancement of the catalytic activity regarding tar reduction in gasification due to the modified particle surface. The improvement of the catalytic activity due to layer formation could be observed for different potential bed materials. It was shown that as long as a bed material, whether it is olivine or e.g. silica sand, has built up a calcium-rich layer, satisfying transformation of tars can be achieved.
This keynote will focus on the knowledge of layer formation on bed particles using different residual biomass fuels and its consequences regarding the performance of fluidizd bed gasification. It will furthermore highlight new results from investigations into the identification of active sites of the ash layered particle surface, where CaO has been identified as enhancing the catalytic activity. When residual biomass, such as manures, were used, P-Ca-conatining components were found to be formed on the surface. This contribution will give a comprehensive overview of ash research conducted in both lab-scale experiments, fundamental analysis and optimizations at the industrial-scale dual fluidized bed gasification plant in Senden, near Ulm, Germany. It will be a comprehensive assessment on ash chemistry in fluidized beds based on long-year experience and new results from collaborative international research work..
Short Biography
Univ.Lecturer Dr. Matthias Kuba is the Head of the Unit Fluidized Bed Technology at BIOENERGY 2020+ GmbH. His team is working primarily in the field of gasification and combustion and is focused on the conversion of biomass, biogenic residues and waste fuels. He leads nationally and internationally funded research projects and is involved in technical consultancy in China. In 2015 he established a close cooperation between BIOENERGY 2020+ GmbH, TU Wien (Austria), LTU Lulea University of Technology (Sweden) and Umea University (Sweden). In the course of this collaboration, Matthias also worked as part-time PhD guest researcher and has received a Kempe scholarship to work as post-doctoral researcher at the Swedish universities. Currently, he is involved as thesis supervisor at both the Swedish universities and at TU Wien. Furthermore, Matthias holds the lecture Thermal Biomass Utilization in the master’s program Chemical Engineering at TU Wien. His publication track is strongly focused on ash transformation in thermo-chemical fluidized bed conversion and the consequences for gasification processes. Within this field of expertise, Matthias acts as regular reviewer for scientific journals and as member of scientific committees in international conferences..
Talk Keywords
Biomass gasification, ash chemistry, ash layer formation, catalytic activity.
Target Audience
Students, Post doctoral, Industry, Doctors and professors
Speaker-intro video

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