A synergistic study of reaction kinetics and heat transfer with multi-component modelling approach for the pyrolysis of biomass waste. (1st August 2020)

• Record Type: Journal Article
• Authors: Siddiqi, Hammad; Kumari, Usha; Biswas, Subrata; Mishra, Asmita; Meikap, B.C.
• Is Part Of: Energy. Volume 204(2020)
• Publication Date: 2020-08-01
• Subjects: Biomass -- Kinetics -- Multi-component model -- Heat transfer -- Pyrolysis number; Power resources -- Periodicals; Power (Mechanics) -- Periodicals; Energy consumption -- Periodicals; 333.7905
• DOI: 10.1016/j.energy.2020.117933
• Languages: English
• ISSNs: 0360-5442

Abstract

Abstract: The present work correlates the heat transport phenomenon coupled with reaction kinetics occurring in the pyrolysis of the coconut shell biomass. The kinetics was modelled assuming an independent parallel reaction of three prominent constituents of biomass namely hemicellulose, cellulose and lignin. Based on the Arrhenius theory and three first order reactions, the kinetic parameters were determined. The activation energy was obtained as 145.20 kJ mol −1, 124.55 kJ mol −1 and 78.60 kJ mol −1 for hemicellulose, cellulose and lignin respectively at a heating rate 10 K/min. The corresponding pre-exponential factor ranges from 5.30х10 6 to 9.60х10 9 min −1 . The kinetic parameters followed a linear relationship showing an energy compensation effect with its parameters 0.1020 mol kJ −1 min −1 and 7.7753 min −1 . Further, these kinetic values for individual components along with other thermo-physical properties had been used to evaluate the transport properties of each. Subsequently, heat transfer map predicted the controlling mechanism with varying particle size for three constituents. Pyrolysis number showed the heat propagation was highest for hemicelluloses of the order 10 10, which was further 100 times slower for cellulose and least for lignin. Also, particle size had a predominant effect on transfer properties with a critical size controlling the change of regime for different components. Graphical abstract: Image 1 Highlights: A coupled heat transfer and kinetic study of biomass pyrolysis. Multi-component approach depicted individual component devolatilization. Kinetic compensation effect parameters were 0.1020 mol kJ −1 min −1 and 7.7753 min −1 . Pyrolysis number was highest for hemicellulose of the order 10 10 . A critical particle size for change of regime for different components.