In industrial smoking, generators are most
often used, in which the sawdust or wood
chips are automatically fed onto a plate or
grate heated to a controlled temperature of
about 350 ° C. The air needed for smoldering
is blown from below the plate. The temperature
in the layer of sawdust depends on the
temperature of the heated grate and on the
volume of supplied air. When small mesh
sawdust is used, the fl ow of air may be hindered
and the temperature tends to be below
that of the plate. Such smoke is rich in
CO. Adding wood chips to the pile increases
the temperature and makes the smoke richer
in phenols. However, in the presence of too
large chips, the development of smoke may
be disturbed by the occurrence of fl ame.