The results of the proximate and ultimate analysis of combusted
fuels is shown in Tables 4 and 5. The investigation was made according
to the corresponding Polish standards and the results are
quite typical for those type of fuels. As indicated by the data in
Table 4 coal sample contained much more ash than biomass and
agromass fuels. It also contained over two times less volatiles than
the other fuel samples. The high heating values of the fuels were
roughly between 18 MJ kg1 (agromass) and almost 22 MJ kg1
(coal). It is interesting that he lowest ash content was determined
for sunflower þ woodchip mixture fuel (1.7% - mass fraction) and the value was lower than the ash content of both the woodchips
and the sunflower pellets (cf. Table 4). Such situation happened
since the sunflower þ woodchip mixture fuel was not just a
mixture of ‘pure’ sunflower pellets (fuel for the test No. 1 e cf.
Table 3) and ‘pure’ woodchips (fuel for the test No. 3 e cf. Table 3)
but that particular fuel mixture was prepared outside of the plant
by different supplier and from different ‘raw’ biomass then the fuels
combusted during tests No. 1 and No. 3. Accordingly, the parameters