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@ARTICLE{Bencze:808694,
author = {Bencze, Laszlo and Rys-Matejczuk, Malgorzata and
Yazhenskikh, Elena and Ziegner, Mirko and Müller, Michael},
title = {{I}nvestigation of {V}aporization of alkali {M}etals {F}rom
{S}olidified {G}asifier {S}lags by {K}nudsen {E}ffusion
{M}ass {S}pectrometry},
journal = {Energy $\&$ fuels},
volume = {30},
number = {1},
issn = {0887-0624},
address = {Columbus, Ohio},
publisher = {American Chemical Society},
reportid = {FZJ-2016-02321},
pages = {657-665},
year = {2016},
abstract = {One problem in coal gasification is the release of alkali
species, which can cause fouling and corrosion. Depending on
their composition, slags have a high potential for alkali
retention. Therefore, the vapor pressures of alkali species
(Na, K) over four real solidified gasifier slag samples were
determined over the temperature range 1134 to 1591 K by
Knudsen effusion mass spectrometry (KEMS). In addition, the
residues from the KEMS investigations were studied by X-ray
diffraction (XRD) and scanning electron microscope/energy
dispersive X-ray (SEM/EDX) to determine the phase
composition of the samples and map the alkali distribution.
A strong correlation between the composition of the slags in
terms of amount of acidic oxides (SiO2, Al2O3) and basic
oxides (CaO, FeO) and the volatility was determined. The
volatility results showed that higher acidic oxide content
leads to higher alkali retention capability. The XRD and
SEM/EDX analysis of the KEMS residues showed that an
anorthite type phase contains more Na than all the other
phases in the equilibrium.},
cin = {IEK-2},
ddc = {620},
cid = {I:(DE-Juel1)IEK-2-20101013},
pnm = {111 - Efficient and Flexible Power Plants (POF3-111)},
pid = {G:(DE-HGF)POF3-111},
typ = {PUB:(DE-HGF)16},
UT = {WOS:000368651800071},
doi = {10.1021/acs.energyfuels.5b01620},
url = {https://juser.fz-juelich.de/record/808694},
}