Catalytic pyrolysis of tobacco rob: Kinetic study and fuel gas produced
ABSTRACT The pyrolysis kinetics of tobacco rob (TR) was investigated using thermogravimetric analysis (TGA) under inert atmosphere, adding chemicals (dolomite and NiO) as catalysts by catalytic-mixing method. The TGA results showed that mass loss and mass loss rates were affected by catalysts. The conversion rates increased while the activation energy decreased. Moreover, the thermal decomposition behaviors of TR were studied in the fixed-bed reactor using dolomite and NiO/γ-Al2O3 as catalysts by catalyst-bed method. A series of experiments had been performed to explore the effects of catalysts, and reaction temperature on the composition and yield of fuel gas. The experiments demonstrated that the catalysts had a high activity of cracking tar and hydrocarbons, as well as yielding a high fuel gas production. For both methods, dolomite and NiO revealed better catalytic performance as a view of enhancing conversion rates and increasing product gas yield.
- SourceAvailable from: Wenhua Gao
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- "Varhegyi et al. (2010) believed that the combustion of tobacco included a step of devolatilization and a step of burning the formed char. Yang et al. (2011) found that by using Dolomite and NiO/␥-Al 2 O 3 as catalysts, during pyrolysis, mass loss increased, pyrolysis temperature decreased, activation energy decreased, and fuel gas yield increased. Kinetic studies of thermal decomposition are essential when investigating the use of biomass for the production of energy and new materials, thus the primary goal of this work was to investigate the reaction models describing the pyrolysis process of tobacco stems and tobacco leaves (Bridgwater et al., 1999; Senneca, 2007; Tsamba et al., 2006). "
ABSTRACT: Tobacco is a very abundant bio-based resource in nature, and large amounts of tobacco residues are produced from the cigarette industry, which can be exploited and utilized for energy. In this work, the pyrolysis of tobacco residues including stems and leaves was analyzed by a Thermogravimetric Analysis (TGA) instrument and the corresponding derivative thermogravimetric analysis (DTG). The TGA curves were obtained at the heating rate of 10 °C/min and with temperature range from 25 °C to 700 °C. The results indicated that the pyrolysis of tobacco stems and tobacco leaves included three stages: dehydration, main devolatilization, and continuous devolatilization. More importantly, between the temperature range of 200 °C and 350 °C, by using the Coats–Redfern equation, correlation coefficients of different reaction models describing the pyrolysis of tobacco stems and leaves were predicted, and the best-fit models for different stages of pyrolysis were found. The activation energies as well as frequency factors (A) from the best-fit models were calculated.Industrial Crops and Products 12/2012; 44:152–157. DOI:10.1016/j.indcrop.2012.10.032 · 2.84 Impact Factor
Article: Waste and fuels from waste[Show abstract] [Hide abstract]
ABSTRACT: Thermogravimetric studies provide the basis for qualification of materials and suitability of biomass fuels and fuels formed from waste to convert them into fuel gas generated in the generator process. The paper presents the results of the analysis of thermal decomposition (thermogravimetric research) of fuel from waste, sewage sludge and wastes from the agro-food: potato pulp and rapeseed meal. Studies have shown how some biofuels and fuel formed from waste reach the semi-coke and coke structure, which is important later, in modeling industry degassing process. The most effective seems to be using rapeseed meal in generator process, since the thermal decomposition occurs in the form of transformation in the temperature range 200–500 °C. On the basis of quantity analysis of gaseous transformation products from the above mentioned transformations, the calorific value of after process gases has been calculated. The highest calorific value is represented by a gas resulting from rapeseed meal pyrolysis ~10,040 kJ/Nm3. The solid residue obtained by dry decomposition of potato pulp has the highest energy value when compared with products from other fuels.Journal of Thermal Analysis and Calorimetry 08/2012; 109(2). DOI:10.1007/s10973-012-2397-0 · 2.04 Impact Factor
Conference Paper: Influence of molten salts on pyrolysis characteristics of rice straw[Show abstract] [Hide abstract]
ABSTRACT: In order to investigate the effects of molten salts on pyrolysis characteristics of rice straw, the pyrolysis behaviors of rice straw had been investigated with thermogravimtirc analysis by changing cations (Na+, K+) and anions (Cl-, CO32- and SO42-) of the molten salts, respectively. The results indicated that the pyrolysis of rice straw was occurred in the range of 200°C and 400°C. With the increase of heating rate, hysteresis was existed during the pyrolysis process, and the maximum weight loss rate increased. The pyrolysis happened at a lower temperature range and the volatile matter vapored easily under the role of CO32-, and SO42- had advantages of fixing charcoal under the same cation conditions. Compared with Na+, it was easier for K+ to generate charcoal under the same anion conditions. Integration method Ozawa was used in kinetic analysis on the samples processed by deducting the added salts, the results showed that the activation energy of rice straw under the role of NaCl, Na2SO4 and KCl decreased compared with that of the sample without additives, while the activation energy processed by Na2CO3 increased. This research can provide a certain reference for the exploitation and utilization of agricultural residues.Biobase Material Science and Engineering (BMSE), 2012 International Conference on; 01/2012