Detailed kinetic analysis and modelling of the dry gasification reaction of olive kernel and lignite coal chars |
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| Affiliation: | 1. Department of Mechanical Engineering, University of Western Macedonia, Kozani, Greece;2. Instituto de Ciencia y Tecnología del Carbono (INCAR-CSIC), Oviedo, Spain;3. School of Production Engineering and Management, Technical University of Crete, Chania, Crete, Greece;4. Chemical Process & Energy Resources Institute, Centre for Research & Technology Hellas, Thessaloniki, Greece;1. Pan African University for Life and Earth Sciences Institute (Including Health and Agriculture), PAULESI, University of Ibadan, Nigeria;2. Schlumberger Offshore Service Limited, the Netherlands;3. National Oil Corporation of Kenya, Kenya;1. Boreskov Institute of Catalysis SB RAS, Lavrentiev Ave. 5, Novosibirsk, 630090, Russia;2. Powder Metallurgy Institute, National Academy of Sciences of Belarus, 41 Platonov Str., Minsk, 220005, Belarus;1. Center of Excellence in Catalysis and Catalytic Reaction Engineering, Department of Chemical Engineering, Faculty of Engineering, Chulalongkorn University, Phyathai Road, Wang Mai, Phatumwan, Bangkok 10330, Thailand;2. Energy Research Institute, Chulalongkorn University, Phyathai Road, Wang Mai, Phatumwan, Bangkok 10330, Thailand;1. Industrial, Energy & Environmental Systems Lab (IEESL), School of Production Engineering and Management, Technical University of Crete, GR-73100, Chania, Greece;2. Department of Mechanical Engineering, University of Western Macedonia, Bakola & Salviera, 50100, Kozani, Greece;3. Chemical Process and Energy Resources Institute, Centre for Research and Technology Hellas, 6th Km Charilaou-Thermi Rd., 57001, Thessaloniki, Greece |
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| Abstract: | The dry gasification process of solid fuels is a promising pathway to mitigate and utilize captured CO2 emissions toward syngas generation with tailored composition for several downstream energy conversion and chemical production processes. In the present work, comprehensive kinetic analysis and reaction modelling studies were carried out for olive kernel and lignite coal chars gasification reaction using pure CO2 as gasifying agent. Chars reactivity and kinetics of the gasification reactions were thoroughly examined by thermogravimetric analysis at three different heating rates and correlated with their physicochemical properties. The reactivity of olive kernel char, as determined by the mean gasification reactivity and the comprehensive gasification characteristic index, S, was almost three times higher compared to that of the lignite coal char. It was disclosed that the fixed carbon content and alkali index (AI) have a major impact on the reactivity of chars. The activation energy, Ea, estimated by three different model-free kinetic methods was ranged between 140 and 170 kJ/mol and 250–350 kJ/mol for the olive kernel and lignite coal chars, respectively. The activation energy values for the lignite coal char significantly varied with carbon conversion degree, whereas this was not the case for olive kernel char, where the activation energy remained essentially unmodified throughout the whole carbon conversion range. Finally, the combined Malek and Coats-Rendfrem method was applied to unravel the mechanism of chars-CO2 gasification reaction. It was found that the olive kernel char-CO2 gasification can be described with a 2D-diffusion mechanism function (D2) whereas the lignite coal char-CO2 gasification follows a second order chemical reaction mechanism function (F2). |
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| Keywords: | Olive kernel char Lignite coal char Model-free kinetic analysis Mechanistic considerations |
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