Mixing coal with RDF prevented or weakened chlorine
deposition markedly. South African coal (co-combusted with
RDF up to 40% portion) hindered Cl deposition. Alkali
deposition was weak and its increase with RDF portion was
also weak for SAC-containing blends. In contrast to this, Polish
coal allowed some Cl deposition at 50- up from wind-side at
both probe temperatures with 40% enb RDF (see Fig. 7b–c)
and alkali deposition was much stronger than for the
corresponding blends of SAC/RDF. Protection ability of Polish
coal collapsed in the 40PC60RDF experiment and deposits up
to 18.4 wt.% Cl were produced (found 50- up from wind-side
position at 420 -C, Fig. 7c).
The molar ratio Cl/(K+Na) in deposits gives an estimate of
alkali compounds. Cl/(K+Na)<1 suggests that other alkali compounds are present besides chlorides, Cl/(K+Na)=1
suggests that all alkalies are deposited as chlorides, and Cl/
(K+Na)>1 indicates that Cl is also bound to other metals than
alkalies. Cl/(Na+K) varied between 0.5 and 0.8 in Cl-rich
deposits (on lee-side and 50- from wind-side) with blends
containing Polish coal, suggesting that chloride deposition was
due to condensation of alkali chloride vapor. Cl deposition was
weak on wind-side because the main deposition mechanism to
this position is impaction (rather than condensation or
diffusion, which dominates at the other positions).
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