Title:
Combustion Behaviour and Slagging Tendencies of Kaolin Additivated Pellets from Fen Paludicultures in a Small-Scale Biomass Boiler
Author(s):
Kuptz, D., Kuchler, C., Rist, E., Eickenscheidt, T., Mack, R., Schön, C., Drösler, M., Hartmann, H.
Document(s):
Paper
Slide presentation
Abstract:
Fuel quality and combustion behaviour of agricultural pellets from paludiculture straw were tested within the research project “MOORuse”. Pellets were produced from Typha ssp., Phragmites australis, Phalaris arundinacea and Carex ssp..Additivation of pellets with kaolin was applied to reduce particle emissions and slagging. Physical fuel properties of pellets met the requirements of ISO 17225-6. Chemical fuel properties(e.g.K and Na content) indicated high TPM emissions for Typha ssp. Distinct slagging for the other species were predicted (e.g. by Si/K-index). During combustion in a small-scale biomass boiler (30 kW), CO and TPM emissions were high for Typha ssp. (CO: 292 mg/m3, TPM: 115 mg/m3, STC) but were reduced by additivation with 2.3 w-% kaolin (CO: 143 mg/m3, TPM: 94 mg/m3, STC). Slagging was high for Phragmites australis, Phalaris arundinacea and Carex ssp. with >40 w-% of total ash consisting of particles >8 mm. Additivation had no positive effect on slagging. In conclusion, paludiculture pellets are challenging fuels that require sufficient fuel upgrading, e. g. by additivation or fuel blending, and a suitable boiler technique that fulfils the legal requirements for the combustion of agricultural fuels in Germany. These requirements are easier met by medium sized combustions plants >100 kW.
Keywords:
combustion, emissions, slagging, additives, solid biofuel, agropellet, agricultural pellets, kaolin additivation
Topic:
Biomass Conversion for Bioenergy
Subtopic:
Biomass and Bioliquids Combustion for Small and Medium Scale Applications
Event:
29th European Biomass Conference and Exhibition
Session:
2AO.5.4
Pages:
399 - 407
ISBN:
978-88-89407-21-9
Paper DOI:
10.5071/29thEUBCE2021-2AO.5.4
Price:
FREE
