A STUDY OF CO-COMBUSTION CHARACTERISTICS OF BIOMASS AND COAL IN DIFFERENT RATIOS

Abstract

Co-burning biomass with coal technology for coal-fired thermal power plants is
of interest due to its potential to reduce gas emissions to the environment. The co-
combustion characteristics of the mixture of two types of coal/biomass fuels including
the degradation stages, flash point and combustion temperature are completely
different from separate combustion cases. The study was conducted to evaluate this
co-combustion property when mixing acacia wood pellet with anthracite coal with
ratio 5, 10, 15, 25%. This is the usually considered ratio for applying direct co-firing in
pulverized coal-fired boilers. The result shows that there is an improvement in the
combustion characteristics of coal is improved in mixing with biomass. The mixture
has an early flash point and the sample weight reduction as well. Regarding a ratio of
less than 15% of biomass, the co-combustibility of the mixture is not much different
from that of coal, but the general ignition temperature of the mixture is earlier.