While the ultimate and proximate analyses provide information on the basic elements of fuel and quality of fuels (heat value, volatile matter, emission potential (based on N and S contents)), the temperature of the start and end pyrolysis, and rate of release of VM are provided by Thermo gravimetric Analyses (TGA). In addition, the modeling of pyrolysis, gasification, various energy conversion processes (see Chapter 2 of this book by Agarwal), co-firing, and reburn behavior and also understand the ignition behavior and NOX reduction characteristics of biomass and coal fuel, fundamental pyrolysis and ignition experiments must be conducted to generate data on fuel properties. Experiments were conducted in a Thermo Gravimetric Analyzer/Differential Thermal Analyzer (TGA/DTA) in both N2 and air environment.