Thermo-kinetic Combustion Performance of Date Palm Fronds: Isothermal TGA Study and Kinetic Modeling
Keywords:
Date palm frond, combustion, reactivity, kinetics, thermodynamic parametersAbstract
This study investigates the characteristics of the Sudanese date palm frond (DPF) residues as potential fuel and available agricultural waste in arid regions. The effects of combustion temperatures (800, 900 and 1000 °C) on thermal behaviour, reactivity, thermo-kinetics, and combustion performance were examined via thermogravimetric analyzer (TGA). The shrinking core models (SCM) or phase boundary-controlled reactions (R2 and R3) and homogeneous model (HM), or the first-order chemical reaction (O1) through the Coats Redfern method, were applied to estimate the kinetic parameters. As well as to find the optimum reaction model. The achieved results explored that, DPF showed high volatile matter content (69.84%), high calorific value (15.92 MJkg-1), high oxygen content (54.31%) and low fixed carbon (12.93%) making it comparable to other common biomass fuels. The DPF combustion process occurred at two stages, the first one was primary devolatilization at temperature region of 146- 364 °C, While the last stage was the char combustion occurred between 402- 478 °C. The maximum weight loss rate and reactivity were found to be proportional to the temperature at stage 1 and inversely at stage 2. While the thermodynamics, kinetics, combustion ignition and combustion performance parameters decreased as the combustion temperature increased for both reaction stages. The reactivity was improved by 2.4- 17.99% at stage 1 and decreased by 6.36- 9.64% at stage 2. Among the kinetic models, model R2 provided Lowest values of thermo-kinetics parameters for all investigation temperatures. However, model O1 showed the highest values. According to Lowest values of activation energies obtained, the model R2 was best one.
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