Estudo cinético da pirólise da biomassa palha de milho verde

Abstract

Brazil is a rich country in biomass, an organic material that stores solar energy in the bonds of its components and from the same is produced a sort of energy. Biomass is a great alternative destination for agro-industrial waste in order to avoid economic and environmental problems. The industrial processing with the purpose of using corns generates agro-industrial waste such as corn stover. Green corn stover obtained from the processing of corn can be considered as biomass which is useful as an energy source in the thermochemical conversion process for energy production due to the fact it consists of high lignocellulosic (lignin, cellulose and hemicellulose) load. Regarding this, the main objective of this study was to analyze the kinetics of pyrolysis which refers to the breaking of chemical bonds under thermal energy use on absence of oxygen for green corn stover biomass. The study took place in an inert nitrogen atmosphere with temperatures ranging from 30°C to 950°C for four heating rates of 5, 10, 15 and 20°C/min. The thermokinetics parameters to analyze the pyrolysis were obtained from thermogravimetric analysis and applied to isoconvercional Flynn-Wall-Ozawa, Kissinger and Friedman methods to determine the energy efficiency of green corn stover. The results obtained were in the range from 54,77 to 263,45 kJ/mol for Flynn-Wall-Ozawa, 207,886 kJ/mol for Kissinger, 7,6 to 372,62 kJ/mol for Friedman, and the high heating value was 16,137 MJ/kg, therefore, the green corn stover biomass is satisfactory as an alternative fuel source. The mathematical model was made by the computational system MATLAB.