When we examine more closely to the wood pellet surface
that we will look smooth, slippery and shiny.
Even as smooth
surface, slick and shiny that there are
people who say that wood pellets
are specially coated. Obviously this
statement is groundless because especially not supported
with a strong argument. Production of several tons, tens
to hundreds to thousands of
tons per day of
wood pellets will produce the number of units
very much. How about
coating process? And how many
substances are used
so that the coating and still economically? Altogether
these people can
not give an answer.
Smooth
surface, slippery and shiny
is really due to the lignin in the wood
tends to be resin that have
plastic property. If mold is stretched and
the temperature increased, the heat and absence of air condition in the shell will cause pyrolysis is
characterized by outer skin
darkened by carbonized. This appears
more clearly in the process of screw briquetteproduction, which also features on heater in the die so that the outer skin
of the briquette carbonized.
The
main components of biomass are cellulose compounds, hemiselulose
and lignin. Each of these compounds has a different thermal decomposition temperature. Carbonization occurs when
compounds of lignin in the biomass decomposes
at a temperature of about 400 C. The table looks like this below.
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