Title:
Co-firing of Pelletized Cassava Rhizome and Eucalyptus Bark in a Fluidized Bed: Studies on the Effects of Co-firing Methods and Bed Material Type on the Combustor Performance and Time-related Bed Behavior
Author(s):
Se, C., Ninduangdee, P., Kuprianov, V.I.
Document(s):
Paper
Abstract:
Cassava rhizome and eucalyptus bark are both promising bioenergy resources in Thailand exhibiting a great energy potential. However, elevated fuel-N and a substantial proportion of potassium in cassava rhizome, and a high moisture content in eucalyptus bark make the individual burning of these biomasses in direct combustion systems to be problematic or even not feasible. In this work, the two biomasses were co-fired in a fluidized-bed combustor, with alternative bed materials, using fuel staging and reburning techniques, to remediate the operational problems. The co-firing methods and operating parameters (excess air, energy fraction of secondary fuel, secondary-to-total air ratio) noticeably affected the combustion and emission performances of the reactor, as well as the physiochemical characteristics of the bed material. Through the co-firing, NO emission from the reactor can be noticeably reduced, as compared to firing pure cassava rhizome (a base fuel), and a greater NO emission reduction was obtained when using reburning. With alternative bed materials (alumina sand and a mixture of alumina and silica sand), the bed agglomeration in the reactor bottom can be substantially decreased, compared to co-firing the selected fuels in a bed of pure silica sand, ensuring a safe operation of the reactor for a relatively long operational time.
Keywords:
biomass, co-firing, NOx emissions, reburning, fluidized bed, fuel staging
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Biomass and bioliquids combustion for small and medium scale applications
Event:
26th European Biomass Conference and Exhibition
Session:
2AO.2.1
Pages:
378 - 389
ISBN:
978-88-89407-18-9
Paper DOI:
10.5071/26thEUBCE2018-2AO.2.1
Price:
FREE
