Title:
Development of a Fuel Flexible Condenser Coupled to a Small-scale Combustion Technology Based on Extreme Air Staging - CFD Based Development and Operation Experiences
Author(s):
Thek, G., Benesch, C., Brunner, T., Obernberger, I., Kerschbaum, M., Popovic, D.
Document(s):
Paper
Abstract:
Condensing biomass boilers gained increasing importance in the residential heating sector within recent years but the fuels for residential condensing biomass boilers are almost exclusively restricted to high quality wood fuels (namely pellets and wood chips). As it is a dedicated aim of the EC and the EU member states to promote the utilisation of biomass fuels for energy production as a measure for CO2 emission mitigation and since high quality wood fuel resources are not available in high volumes in many European regions, the fuel spectrum to be applied in residential biomass combustion systems must be broadened in order to cover the rising fuel demand while avoiding increasing fuel prices in future. Moreover, measures to further increase the thermal efficiency of residential biomass boilers are urgently required to use the available biomass potentials as efficiently as possible and to keep them competitive in comparison to fossil fuel based systems, also in terms of energy labelling. Within an EU funded project a condenser based on the diffusion bonding technology has been developed for a fuel flexible biomass boiler based on extreme air staging with ultra-low emissions and optimised in terms of compactness and high efficiency. The development work has been supported by CFD (computational fluid dynamics) simulations. Subsequently, a condenser prototype has been manufactured and tested during a comprehensive test run program with two different biomass fuels (forest residues, miscanthus pellets). The results, which are presented in this paper, show, that an economically attractive solution could be reached which is able to fulfil the requirements for fuel flexible operation and to ensure high efficiencies of the overall plant.
Keywords:
biomass, combustion, efficiency, emissions, flue gas condensation, fuel flexibility
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Biomass and bioliquids combustion for small and medium scale applications
Event:
27th European Biomass Conference and Exhibition
Session:
2AO.5.4
Pages:
454 - 461
ISBN:
978-88-89407-19-6
Paper DOI:
10.5071/27thEUBCE2019-2AO.5.4
Price:
FREE
