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Diffusion Modeling in TGA in Context of CO2 Gasification of Char

G. Samdani1 S. Mahajani1 A. Ganesh1 P. Aghalayam2 R. K. Sapru3 D. K. Mathur3
1Department of Chemical Engineering, Indian Institute of Technology Bombay, Mumbai, India
2Indian Institute of Technology Madras, Chennai, India
3UCG Group, IRS, ONGC, Chankheda, Ahmadabad

Total surface averaged reaction rate profile at different time.

The Thermo- Gravimetric Apparatus (TGA) is often used for kinetics determination. In TGA setup, gasification reaction may be limited by the reach (diffusion) of the gasification agent to the internal surfaces of the char particles. In addition to this, after some time, ash is formed between the bulk of the gas and the upper surface of char. The present modeling exercise is aimed at examining the diffusion effects on TGA gasification experiments using CO2 as a gasification agent. CO2 gasification data and kinetics parameters are available. (Mandapati, 2012).

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