4. Results
4.1. 100 kW CFB reactor
4.1.1. Combustion performance
For the 100 kW CFB reactor, stoichiometry varied
between 1.3 and 1.5 and gas temperature in the riser was
between 830 -C and 940 -C (Fig. 1). Table 3 shows the
measured mean flue gas composition. Excluding CO,
fluctuation in composition was minor during the stable
period. From time to time, RDF formed blocks, which led
to uneven feeding followed by peaking CO values, which
markedly increased the mean CO concentrations. This
phenomenon is best observed with fuels 80PC20RDF and
40PC60RDF. The staging was not optimal for blends with
high volatile content (less primary air should have been fed to
achieve stronger NOx reduction). With RDF-containing feedstocks,
low moisture (about 8 wt.%) and high volatiles
content (79 wt.%) of RDF led to a sharp increase in
temperature in the secondary air feeding zone (1–1.5 m
from the bottom of the riser) indicating fast drying, pyrolysis
and volatiles combustion in the lower parts of the reactor.
4. Results4.1. 100 kW CFB reactor4.1.1. Combustion performanceFor the 100 kW CFB reactor, stoichiometry variedbetween 1.3 and 1.5 and gas temperature in the riser wasbetween 830 -C and 940 -C (Fig. 1). Table 3 shows themeasured mean flue gas composition. Excluding CO,fluctuation in composition was minor during the stableperiod. From time to time, RDF formed blocks, which ledto uneven feeding followed by peaking CO values, whichmarkedly increased the mean CO concentrations. Thisphenomenon is best observed with fuels 80PC20RDF and40PC60RDF. The staging was not optimal for blends withhigh volatile content (less primary air should have been fed toachieve stronger NOx reduction). With RDF-containing feedstocks,low moisture (about 8 wt.%) and high volatilescontent (79 wt.%) of RDF led to a sharp increase intemperature in the secondary air feeding zone (1–1.5 mfrom the bottom of the riser) indicating fast drying, pyrolysisand volatiles combustion in the lower parts of the reactor.
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