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.
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 109(2). · 1.98 Impact Factor
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ABSTRACT: The removal of CO2 and tar in fuel gas produced by biomass thermal conversion has aroused more attention due to their adverse effects on the subsequent fuel gas application. High quality fuel gas production from sawdust pyrolysis with CaO was studied in this paper. The results of pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS) experiments indicate that the mass ratio of CaO to sawdust (Ca/S) remarkably affects the behavior of sawdust pyrolysis. On the basis of Py-GC/MS results, one system of a moving bed pyrolyzer coupled with a fluid bed combustor has been developed to produce high quality fuel gas. The lower heating value (LHV) of the fuel gas was above 16MJ/Nm(3) and the content of tar was under 50mg/Nm(3), which is suitable for gas turbine application to generate electricity and heat. Therefore, this technology may be a promising route to achieve high quality fuel gas for biomass utilization.Bioresource Technology 01/2014; 156C:78-83. · 5.04 Impact Factor
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ABSTRACT: Castor beans are one of the world's top ten oil crops, with approximately 50% castor oil and 50% castor meal being obtained after a two-stage pressing process (cold and hot pressing). Nevertheless, castor meal still contains a significant amount of residual oil, due to the mechanical limitations of current pressing technology, and this can be further extracted from by means of thermal pyrolysis. In the study, the Taguchi method is performed to optimize the thermal pyrolysis of castor meal in order to maximize the yield of pyrolytic oil. The effects of different parameters on castor meal pyrolysis are investigated, namely the pyrolytic temperature, residence time, heating rate and nitrogen flow rate. The pyrolysis control factors were selected and categorized into three levels. Based on the Taguchi design concept, an L9 orthogonal array was chosen for the experiments. The results show that the maximum yield of 19.61% (g-pyrolytic oil/g-castor meal) pyrolytic oil is obtained when the castor meal is subjected to a pyrolytic temperature of 400 °C, residence time of 120 min, heating rate of 20 °C/min, and the nitrogen flow rate of 200 mL/min. The effective sequence of different parameters on castor meal pyrolysis is the nitrogen flow rate, pyrolytic temperature, residence time and heating rate, respectively. The results of the experiment confirm that there were some differences between the theoretical and experimental yields because of certain assumptions in the Taguchi method and the non-uniformity of castor meal. As to the external energy input for castor meal pyrolysis, a preliminary assessment of electric power consumption was 3.27 kW-hr for the treatment of 1 kg castor meal at 400 °C for a period of 60 min.Energy 07/2014; · 4.16 Impact Factor