Title:
Characterization of the Ash Melting Properties by Various Biomass Ashes
Author(s):
Marro, R., Friese, K., Grzechnik, A., Spliethoff, H., Gaderer, M.
Document(s):
Paper
Poster
Abstract:
For the high - temperature combustion of biomass, investigations were carried out in an electrically heated entrained flow reactor to analyze the fly ash by varying different parameters. Using torrefied biomass, birch, spruce and straw were used. In general, the main constituents of their ash fractions are K, Si, Ca and Mg, resulting in high alkali indices, which predict a large fouling tendency. We studied the fusibility and flow properties of the bottom ash of the reactor and the laboratory ash. To distinguish the melting behavior of the ashes, different ex - situ measurement methods were used. The characteristic temperatures, given by the ash melting microscope (AMM) will be compared with the data of differential scanning calorimeter (DSC). The thermal decomposition properties were studied using thermogravimetric analysis (TGA). With these analyses it was possible to determine and to delimit qualitatively the fusibility of the ash. To characterize the ash composition we used two main techniques: X - ray fluorescence (XRF) to chemically analyze the samples and X - ray diffraction (XRD) to determine the mineral composition the samples. Furthermore, chemical equilibrium calculations with the program FactSage were used to understand the nature of the gases, liquids and solids resulting from the biomass combustion. The volume fraction of the liquid and solid phase within a specific temperature range was calculated and will be compared with the data of the AMM and DSC.
Keywords:
combustion, fly ash, straw, reactor, torrefied biomass
Topic:
Biomass Conversion Technologies for Heating, Cooling and Electricity
Subtopic:
Solid biofuels combustion for small and medium scale applications
Event:
22nd European Biomass Conference and Exhibition
Session:
2BV.2.39
Pages:
705 - 710
ISBN:
978-88-89407-52-3
Paper DOI:
10.5071/22ndEUBCE2014-2BV.2.39
Price:
FREE
