Nombre: MARIANA DE JESUS LIMA
Tipo: MSc dissertation
Fecha de publicación: 20/03/2018
Supervisor:
Nombre |
Rol |
|---|---|
| TAISA SHIMOSAKAI DE LIRA | Advisor * |
Junta de examinadores:
| Nombre |
Rol |
|---|---|
| BEATRIZ CRISTINA SILVERIO | External Examiner * |
| DANIEL DA CUNHA RIBEIRO | Internal Examiner * |
| TAISA SHIMOSAKAI DE LIRA | Advisor * |
| THIAGO PADOVANI XAVIER | Co advisor * |
Resumen: The current state of the world's energy resources has been contributing to the focus on research and testing that uses the energy present in lignocellulosic biomass to be converted into liquid, gaseous or solid fuels. The agricultural residues are distinguished by the quantity that are generated in agroindustrial countries like Brazil. In this work the coffee bark as agroindustrial residue for energy generation was evaluated through the pyrolysis process. The coffee
husk was characterized, some parameters were evaluated through kinetic models using thermogravimetric analysis, and the pyrolysis reaction was performed for process analysis, besides the characterization of the liquid product by GC/MS. The obtained heat value, 18.17 kJ/g, as well as results of elemental analysis and immediate analysis, show that this biomass has a potential for use as an energy source. By X-ray fluorescence analysis it was possible to identify several metals that make up the residues generated at the
end of the thermal process, being the inorganic compounds and oxides of the elements potassium and calcium found in greater quantity. With the infrared vibrational spectroscopy analysis, it was possible to characterize the biomass connections analyzed and to relate to the main components of lignocellulosic materials, which, through lignocellulosic analysis, identified the concentration of these components. It was determined by thermogravimetric analysis the most appropriate temperature range for pyrolysis of the coffee husk (400-500ºC) and, through the kinetic models, which described the pyrolysis reaction process, it was possible to determine the kinetic energy for the coffee husk (124,10 133,27 kJ/mol). The biomass was submitted to a thermal conversion process, more precisely to conventional pyrolysis in a fixed bed, for the analysis of parameters such as temperature and average diameter, in which the influence
of temperature in this process was highlighted, and the net fraction obtained, phenolic compounds and caffeine. The possibility of forming chemicals with diversified utilities and high added value makes pyrolysis one of the most promising thermal conversion technologies.
Key words: Coffee bark. Pyrolysis. Kinetic parameters.
