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International Conference on Innovative Applied Energy    

E-Proceedings ISBN: 978-1-912532-05-6

St Cross College, University of Oxford, United Kingdom



Thermogravimetric Analysis of Coal and Sawdust Blends for Efficient Syngas Production



Munmi Bhattacharyya, Pinakeswar Mahanta and Kaustubha Mohanty

Centre for Energy, IIT Guwahati, Assam, India



Paper Abstract

Coal and biomass stands as a candidate source to gasification technology for production of high calorific value synthesis gas. However, the concept of co-gasification has geared up by blending feed-stocks, preferably coal and biomass blends to avoid the lacunae of fossil fuels and deranging effects of coal and biomass individually. Using thermo-gravimetric analysis technique, the pyrolysis kinetic parameters of low grade Indian coal and a biomass material (sawdust) blend were investigated at various heating rates 5, 10 and 20 K/min under Argon atmosphere (gas flow rate: 20ml/min). Four decomposition stages (moisture removal, devolatilization, pyrolysis and char formation) were obtained for coal-biomass blends. Friedman differential method was utilized considering conversion at a single value at various temperatures as a priority analytical method. Ea was calculated from the slope of linear plots without any influence of other parameters whilst A and k were calculated from the intercept of linear plots. In this theory considering it to be a first order reaction, activation energy obtained was approx. 12.17-104.74 kJ/mol whereas, pre-exponential factor differs for different thermal events with its value decreasing with increase in conversion. Sawdust blended with coal showed high Ea and A values because of the complexity of lignin structure. The decomposition of lignin composes of several chemical reactions, such as the cleavage of α-and β-aryl-aryl-ether linkages, splitting of aliphatic side chains from the aromatic rings and cleavage of carbon-carbon linkage between lignin units. It is also notified that char reactivity is inversely proportional to pyrolysis heating rate. Further, the obtained DTG profiles during co-pyrolysis experiments were used to study the interaction between coal and biomass to evaluate whether such synergistic interactions prevailed between the two feedstocks. 

Paper Keywords
Coal/Sawdust Blend, Syngas, Kinetics, Synergy, Thermogravimetric analysis, Friedman Model, Pre-exponential factor, Activation Energy, Rate Constant, Order of reaction.
Corresponding author Biography

Munmi Bhattacharyya is a 3rd year PhD Research Student of the Centre for Energy, IIT Guwahati. Munmi is a post-graduate of the Institute of Chemical Technology, University of Mumbai, where she received a M.Tech (First Division) in Green Technology (2014). Her research interests include energy, green technology, combustion and gasification, catalysis and reaction kinetic studies. Currently, she works in the topic entitled “Co-gasification of coal and biomass blends along with hot gas scrubbing” under the supervision of Prof. Pinakeswar Mahanta and Prof. Kaustubha Mohanty, Centre for Energy, IIT Guwahati. She has done couple of experiments on thermogravimetric analysis for coal-biomass blends along with its DSC studies and is working on the thermodynamic and kinetic modelling of the process. During her tenure in M. Tech program, she worked on “Studies on CO2 reforming of methane” in the Department of Chemical Engineering, Institute of Chemical Technology Mumbai with the application of commercial catalysts and lab-based catalysts.
Further, Munmi Bhattacharyya is a graduate in (B. Tech Biotechnology) from Amity University Noida, Uttar Pradesh where her focus areas relied on chemical reaction engineering, biochemical engineering, bioprocess technology, thermodynamics and genetics. She has also published a review paper (a database) during her program in B.Tech. Biotechnology on “a cancer gene SEMA3B” in “Atlas of Genetics and Cytogenetics in Oncology and Haematology”. To add on, she also has a one-year work experience in the Division of Chemical Engineering, CSIR-North East Institute of Science and Technology as a Project Assistant Level-II in the project “Scale up of secondary metabolites siderophore in a lab-scale bioreactor and its kinetic studies” prior to her M. Tech Program.

The International Conference on Innovative Applied Energy (IAPE’18)