Oxy-combustion of corn, sunflower, rape and microalgae bioresidues and their blends from the perspective of thermogravimetric analysis

• We study the effects of CO2 in oxidation of several biomasses and its blends.
• Two isoconversional kinetic models are proposed to obtain kinetic parameters.
• Kinetic parameters are calculated to improve equipment design investigation.
• Microalgae has a lower thermal degradation than lignocellulosic biomasses.
• The blending of corn-rape improves de oxy-combustion of individual biomasses.

Thermogravimetric analysis was used to study and compare the oxy-combustion of different blends of corn bioresidues with sunflower, rape and algae bioresidues. Non-isothermal thermogravimetric data were used to obtain the oxy-combustion kinetics of these bioresidues. This paper reports on the application of the Vyazovkin and Ozawa-Flynn-Wall isoconversional methods to evaluate the kinetic parameters (energy activation, pre-exponential factor and reaction order) in the oxy-combustion of the bioresidues studied.The activation energy obtained from corn oxy-combustion (E∼168.9 kJ mol−1) was lower than that from the blends (corn-sunflower, E∼189.0 kJ mol−1 and corn-microalgae, E∼201.9 kJ mol−1) whereas the activation energy obtained from the corn-rape blend was the lowest (E∼155.9 kJ mol−1).Both the Vyazovkin and Ozawa-Flynn-Wall methods yielded similar results.