Study on oxy-fuel combustion of rice straw using thermogravimetric (TG) analysis coupled with Fourier transform infrared (FTIR) spectroscopy to get the combustion characteristics and its behavior during combustion process.
Different oxy-fuel conditions, consist of 21%O₂ / 79% CO₂, 30%O₂ / 70% CO₂, and pure oxygen was investigated using TG-FTIR technique. Air-combustion was also investigated as the base case.
The combustion characteristics and indices were calculated from TG results, weight loss rate. The gas species released and its concentration was the results from FTIR.
The replacement of N2 by CO2 in air-combustion causes the relatively poor combustibility in oxy-fuel condition, delayed char combustion process, lower the maximum weight loss, increase ignition and burnout temperature. However, the increasing oxygen concentration resulted in larger maximum weight loss, decrease ignition temperature and increase combustion performance indices.
From FTIR measurement, major gas species released are CO, CO2, CH4, and H2O for all experiments. The concentration of CO2 in oxy-fuel condition will broadening the devolatilization and bring out the autothermal reforming (ATR), so more CO release at higher temperature.
Hendrik, H., Wu, M. H., Lin, T. H. (2014), Growth of CuO Nanowires on a Copper Wire through Thermal Oxidation, paper presented at 31th National Conference on Mechanical Engineering of CSME, Taichung, Taiwan.