Characterization of Vinasse for Thermochemical Conversion - Fuel Fractionation, Release of Inorganics, and Ash-Melting Behavior

A1 Journal article (refereed)

Internal Authors/Editors

Publication Details

List of Authors: Meheretu Jaleta Dirbeba, Anders Brink, Maria Zevenhoven, Nikolai DeMartini, Daniel Lindberg, Leena Hupa, Mikko Hupa
Publisher: American Chemical Society
Publication year: 2019
Journal: Energy and Fuels
Journal acronym: energy&fuels
Volume number: 33
Issue number: 7
Start page: 5840
End page: 5848
eISSN: 1520-5029


distribution of ash-forming elements in dried vinasse was characterized by
sequentially leaching it in H2O, NH4Ac, and HCl. In addition, the release of inorganics during
combustion and CO2 gasification of the vinasse at 900 °C in a single
particle reactor was determined. Furthermore, the vinasse was ashed at 500 °C,
and the melting behavior of the ash as a function of temperature was first
predicted using FactSage thermodynamic calculations and then validated using
differential scanning calorimetry (DSC)−thermogravimetric analysis (TGA)
measurements. The fuel fractionation results revealed that almost all of the
ash-forming elements, except Si, Al, and Fe, in the vinasse were completely
water-soluble. Moreover, unlike other solid fuels, significant portions of Si,
Al, and Fe in the vinasse were water-soluble, owing to its origin, juice from
water-extracted cane stalks, and acidic nature. Analysis results of the ashes
from the combustion and gasification experiments showed that none of the water-
and acetate-soluble Si, Al, Fe, and P in the vinasse was released during
combustion and gasification. However, significant levels of the water- and
acetate-soluble K, Na, Ca, Mg, S, and Cl were released during the vinasse
thermal conversion in both gas conditions, with the release levels being higher
in CO2 than in O2. The thermodynamic calculation and DSC−TGA measurement
results showed that the initial melting temperature of the vinasse ash was
640−645 °C, and the temperatures corresponding to 15 and 70% melt fractions
were 650 and 670−690 °C, respectively. The low-temperature melting ash and the
release of significant amounts of water- and acetate-soluble alkali and alkali
chlorides during thermal conversion suggest that vinasse is a challenging fuel
for combustion and gasification in conventional boilers and gasifiers.


Ash-forming elements, Ash-melting behavior, Fuel fractionation, Thermochemical conversion, Vinasse


Last updated on 2020-25-09 at 06:38