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Experiments and stochastic simulations of lignite coal during pyrolysis and gasification

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  • Ahmed, I.I.
  • Gupta, A.K.

Abstract

Lignite pyrolysis and gasification has been conducted in a semi batch reactor at reactor temperatures of 800–950°C in 50°C intervals. CO2 has been used as the gasifying agent for gasification experiments. The objective of this investigation is to understand the mechanism of syngas evolution during pyrolysis and to unravel the effect of CO2 on pyrolysis mechanism. Stochastic simulations of lignite pyrolysis have been conducted using Gillespie algorithm. Two reaction mechanisms have been used in the simulations; first order, single step mechanism and the FLASHCHAIN mechanism. The first order single step mechanism was successful in fitting cumulative yield of CO2, CO, CH4 and other hydrocarbons (CnHm). The first order, single step failed to fit the cumulative yield of hydrogen, which suggests a more complex mechanism for hydrogen evolution. Evolution of CO2, CO, CH4, CnHm and H2 flow rates has been monitored. The only effect of CO2 on pyrolysis mechanism is promotion of reverse water gas shift reaction for the experiments described here. Methane evolution extended for slightly longer time than other hydrocarbons and hydrogen evolution extended for a slightly longer time than methane. This indicated the evolution of hydrogen via further pyrolysis of aliphatic hydrocarbon. It is also suggested that this step occurs in series after aliphatic hydrocarbons evolution by bridges scission.

Suggested Citation

  • 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.
    • Handle: RePEc:eee:appene:v:102:y:2013:i:c:p:355-363
    DOI: 10.1016/j.apenergy.2012.07.049
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    References listed on IDEAS

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    1. Ahmed, I. & Jangsawang, W. & Gupta, A.K., 2012. "Energy recovery from pyrolysis and gasification of mangrove," Applied Energy, Elsevier, vol. 91(1), pages 173-179.
    2. 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.
    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. Ahmed, I.I. & Gupta, A.K., 2011. "Kinetics of woodchips char gasification with steam and carbon dioxide," Applied Energy, Elsevier, vol. 88(5), pages 1613-1619, May.
    6. Ahmed, I. & Gupta, A.K., 2009. "Evolution of syngas from cardboard gasification," Applied Energy, Elsevier, vol. 86(9), pages 1732-1740, September.
    7. Ahmed, I. & Gupta, A.K., 2009. "Characteristics of cardboard and paper gasification with CO2," Applied Energy, Elsevier, vol. 86(12), pages 2626-2634, December.
    8. 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.
    9. Ahmed, I.I. & Gupta, A.K., 2012. "Sugarcane bagasse gasification: Global reaction mechanism of syngas evolution," Applied Energy, Elsevier, vol. 91(1), pages 75-81.
    10. Nipattummakul, Nimit & Ahmed, Islam & Kerdsuwan, Somrat & Gupta, Ashwani K., 2010. "High temperature steam gasification of wastewater sludge," Applied Energy, Elsevier, vol. 87(12), pages 3729-3734, December.
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