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Particle size, porosity and temperature effects on char conversion

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  • Ahmed, I.I.
  • Gupta, A.K.

Abstract

The effect of particle size, porosity and reactor temperature/reaction rate constant on the progress of a char particle conversion has been investigated numerically by solving the transport equation inside a reacting char particle. Numerical simulations have been conducted for three cases that include two extreme cases and one general case. The two extreme cases correspond to a very large Damkohler number (3.2607×103) and a very small Damkohler number (0.0042). The third case corresponds to an intermediate value of Damkohler number. For the very large Damkohler number case, concentration profiles of the gasifying agent showed a steep gradient across the particle and the reaction occurred mostly in outer layer of the particle. This behavior corresponds to a diffusion controlled process. For the very small Damkohler number case, gasifying agent concentration was a straight line parallel to the x-axis, with a y-axis value of the surrounding concentration. The reaction occurred homogeneously across the particle and the degree of conversion was only a function in time. This behavior corresponds to a chemically controlled process. The total conversion of the char particle as a function of time has also been calculated for different particle sizes, initial porosity and reaction rate constant. Variation in conversion profiles as a function of time due to variation in initial porosity and reaction rate constant were limited to a certain extent. Very high initial porosity values tend to shift the process towards a chemically controlled one; any further increase in porosity does not have a positive effect on the conversion–time relationship. Very high reaction rate constants tend to shift the process towards diffusion controlled process. Kinetic parameters have been determined experimentally using a chemically controlled process. The obtained parameters have been used in the model to determine the progress of char particle conversion at an increased reactor temperature of 1000°C. The model has been compared to experimental results at the same temperature (1000°C). The results showed very good agreement.

Suggested Citation

  • Ahmed, I.I. & Gupta, A.K., 2011. "Particle size, porosity and temperature effects on char conversion," Applied Energy, Elsevier, vol. 88(12), pages 4667-4677.
    • Handle: RePEc:eee:appene:v:88:y:2011:i:12:p:4667-4677
    DOI: 10.1016/j.apenergy.2011.06.001
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    References listed on IDEAS

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    1. Erlich, Catharina & Fransson, Torsten H., 2011. "Downdraft gasification of pellets made of wood, palm-oil residues respective bagasse: Experimental study," Applied Energy, Elsevier, vol. 88(3), pages 899-908, March.
    2. Yilgin, Melek & Pehlivan, Dursun, 2009. "Volatiles and char combustion rates of demineralised lignite and wood blends," Applied Energy, Elsevier, vol. 86(7-8), pages 1179-1186, July.
    3. Ahmed, I.I. & Nipattummakul, N. & Gupta, A.K., 2011. "Characteristics of syngas from co-gasification of polyethylene and woodchips," Applied Energy, Elsevier, vol. 88(1), pages 165-174, January.
    4. Ahmed, I. & Gupta, A.K., 2009. "Syngas yield during pyrolysis and steam gasification of paper," Applied Energy, Elsevier, vol. 86(9), pages 1813-1821, September.
    5. Sand, U. & Sandberg, J. & Larfeldt, J. & Bel Fdhila, R., 2008. "Numerical prediction of the transport and pyrolysis in the interior and surrounding of dry and wet wood log," Applied Energy, Elsevier, vol. 85(12), pages 1208-1224, December.
    6. Ahmed, I. & Gupta, A.K., 2009. "Characteristics of cardboard and paper gasification with CO2," Applied Energy, Elsevier, vol. 86(12), pages 2626-2634, December.
    7. Ahmed, I.I. & Gupta, A.K., 2010. "Pyrolysis and gasification of food waste: Syngas characteristics and char gasification kinetics," Applied Energy, Elsevier, vol. 87(1), pages 101-108, January.
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    Cited by:

    1. Ahmed, I.I. & Gupta, A.K., 2013. "Experiments and stochastic simulations of lignite coal during pyrolysis and gasification," Applied Energy, Elsevier, vol. 102(C), pages 355-363.
    2. López-González, D. & Fernandez-Lopez, M. & Valverde, J.L. & Sanchez-Silva, L., 2014. "Gasification of lignocellulosic biomass char obtained from pyrolysis: Kinetic and evolved gas analyses," Energy, Elsevier, vol. 71(C), pages 456-467.

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