Chemical composition of agromass ash and its influence on ash melting characteristics
Laen...
Kuupäev
2018
Kättesaadav alates
Autorid
Čepauskienė, D.
Pedišius, N.
Milčius, D.
Ajakirja pealkiri
Ajakirja ISSN
Köite pealkiri
Kirjastaja
Abstrakt
The increasing demand for biofuels leads to a growing need for agromass, such as
herbaceous plants and agricultural waste.
However, agromass contains high quanitites of alkali
metals, mainly potassium and sodium, which limits agromass usage in
thermoconversion
processes. Alkali metals react with other ash forming elements which leads to ash related
problems such as agglomeration, fouling and slagging during agromass burning. In this study,
chemical composition and melting behaviour of ashes form
ed at 550
°
C
are investigated. Three
herbaceous plants (reed canary grass, hemp, orchard grass), four types of agricultural waste
(straws of rye, wheat, buckwheat and canola) and two types of woody biomass (birch, spruce) are
selected. Ash
melting behaviou
r, composition and bulk structure are determined using a high
temperature furnace with a video camera, inductively coupled plasma atomic emission
–
spectrometry and
X
–
ray diffraction
technique, respectively
. Ash
melting behaviour of selected
agromass types s
hows that the hemp ash has the highest shrinkage starting temperature which
reaches 1
,
079
°C. This is due to the high content of calcium and low content of potassium and
sodium in hemp ash. T
hree main components calcium carbonate, potassium sulfate and pot
assium
chloride have been identified in ashes after agromass and woody biomass are heat
–
treated at
temperature of 550
°C.
Kirjeldus
Article
Märksõnad
agromass, agrofuels, ash, ash melting, alkali metals, articles