In recent years, some researchers have reported the cogasification
of woody biomass and coal; this has several
advantages as follows [5–7]: the addition of woody biomass
to coal gasification can not only reduce CO2 emissions but
also the problems caused by sulfur and ash contained in
coal; this is because the woody biomass has almost no sulfur
and low ash content. However, biomass gasification is
relatively high-cost and produces relatively the large
amount of tar. Therefore, the co-gasification can not only
reduce the cost of the feedstock but also reduce the problems
that occur in plant operation due to the production
of tar.