Thermal Behavior and Kinetics of Raw/Pyrolytic Wood and Coal Blends during Co-combustion Process

摘要

The thermal properties of raw wood (RW)biomass,corresponding pyrolytic wood (PW)biomass,and their blends with anthracite coal (AC)were evaluated under combustion conditions with a thermogravimetric analysis (TGA)method.The blending ratios of the biomass with AC ranging from 0 to 100 mass% were taken into consider-ation to investigate the thermal behavior and kinetics of these blends during their co-combustion.For blends with dif-ferent ratios of the RW to AC and 100% AC (100 AC),two distinct mass loss peaks related to the release or com-bustion process of the volatiles and the combustion of the char were noted.The addition of a higher ratio of RW or PW into AC can improve the combustion process of the blends.The thermal behavior of the RW/AC or PW/AC blends could not be characterized by a simple linear correlation of their pure material thermal behavior.With the RW/PW addition ratios varying from 25 mass% to 80 mass%,the apparent activation energy of the blends gradually decreased from 48.46 to 34.93 kJ/mol and from 82.74 to 37.81 kJ/mol for the RW/AC and PW/AC blends,re-spectively,with high correlation coefficient (R2 )values ranging from 0.995 6 to 0.998 4.