Title:
Densification of Char from the Gasification of Woody Biomass to High Quality Pellets for Further Energetic Use
Author(s):
Kirsten, C., Pollex, A., Zeng, T.
Document(s):
Paper
Abstract:
In the most wood gasification technologies, char accumulates as fine particles. Depending on the particle size distribution, this may lead to a high dust load and explosion hazards. In addition, the dust has process- related disadvantages for certain applications. If gasifier char is to be used as a fuel for micro-cogeneration plants, a defined and uniform particle size distribution is necessary to ensure a proper material flow into the fuel bed. For the production of pellets from gasification char, the common technology from wood and feed pelleting can be used. The tests were carried out with a ring die press on a pilot scale (30 kW), a 6x20 mm die and a distance between roller and die of 0.5 mm. The moisture content, type and the amount of binder were varied. The tested matrix binders were carboxymethylcellulose (CMC) and starch. During the first pelleting pre-tests, the necessity of a high water content for the densification of the pulverized material was evident to achieve low energy demand during operation while optimal physical-mechanical properties can be achieved by the subsequent drying process and hardening of the binder. However, the bulk density is reduced due to the loss of water. Furthermore, the model evaluation of the durability shows that the amount of binder and the moisture content have a stronger influence compared to the type of binder. For the modelled bulk density, the moisture content seems to have the highest influence.
Keywords:
pellet, char, densification, pelleting
Topic:
Biomass Conversion for Bioenergy
Subtopic:
Biomass pretreatment for solid fuels and production of intermediates
Event:
30th European Biomass Conference and Exhibition
Session:
4CO.12.1
Pages:
604 - 607
ISBN:
978-88-89407-22-6
Paper DOI:
10.5071/30thEUBCE2022-4CO.12.1
Price:
FREE
