Estudo dos parâmetros cinéticos da pirólise do bagaço de cana-de-açúcar

• Autor(a) principal: Silva, Jean Constantino Gomes da
• Data de Publicação: 2017
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações da UFPB
• Texto Completo: https://repositorio.ufpb.br/jspui/handle/123456789/12765
• topic: Bagaço de cana-de-açúcar; Biomassa; Método isoconversional; Parâmetros cinéticos e pirólise; Biomass; Isoconversional method; Kinetic parameter; Pyrolysis and sugarcane bagasse; Energia renováveis; CNPQ::ENGENHARIAS

Environmental concerns, generated by the use of fossil fuels, has made countries look for energy-efficient alternatives in order to supply the energy demand in a sustainable way. In this context, wastes generated by agricultural and industrial sectors, which generally do not have economic value, can represent an important energy source. The recovery of these residues can be performed through a thermochemical conversion process such as pyrolysis. The pyrolysis products are gas, liquid and/or solid compounds that it can be used as an energy source or Raw material for chemical industry. However, to obtain a higher efficiency of pyrolytic conversion reactors, it is necessary to know the physicochemical characteristics, the thermal behavior and the kinetic parameters of the chemical reactions. Thus, the main aim of this work is to evaluate the kinetic parameters (activation energy, pre-exponential factor and reaction model) of the pyrolysis process of sugarcane bagasse, besides observing the physicochemical properties and thermal behavior of this residue. The physicochemical characterization was performed through proximate analysis, ultimate analysis, high heating value calculation, X-ray fluorescence (XRF) and Fourier transform infrared spectroscopy (FTIR). The thermogravimetric behavior of the sugarcane bagasse pyrolysis process was observed through thermogravimetric analysis based on variation of parameters of mass, particle diameter, chemical composition and atmosphere. For kinetic parameters evaluate of sugarcane bagasse pyrolysis were used weight loss data at five different heating rates (2, 5, 10, 20 and 30 ºC min-1) under gas flow of nitrogen (99.997%), where the isoconversional methods of Friedman Flynn-Wall-Ozawa (FWO) and Kissinger-Akahira-Sunose (KAS) were initially applied to obtain activation energy values. The pre-exponential factor and reaction model were obtained through the effect of compensation and masterplot, respectively. From the results of the physicochemical characteristics, it can be observed that the sugarcane bagasse presents a satisfactory applicability at pyrolytic system, due to its low moisture and ash content, and with a significant potassium composition between the inorganic compounds. Different thermal behavior could be observed by variation of parameters of mass, particle diameter, chemical composition and atmosphere. The kinetic parameters evaluated from the isoconversional methods showed that the KAS method presents better application, among the three methods used, due to the results of the kinetic parameters present a smaller difference between experimental results.