IDEAS home Printed from https://ideas.repec.org/a/eee/appene/v88y2011i12p4667-4677.html
   My bibliography  Save this article

Particle size, porosity and temperature effects on char conversion

Author

Listed:
  • 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
    as

    Download full text from publisher

    File URL: http://www.sciencedirect.com/science/article/pii/S0306261911003710
    Download Restriction: Full text for ScienceDirect subscribers only
    File URL: https://libkey.io/10.1016/j.apenergy.2011.06.001?utm_source=ideas
    LibKey link: if access is restricted and if your library uses this service, LibKey will redirect you to where you can use your library subscription to access this item
    ---><---

    As the access to this document is restricted, you may want to search for a different version of it.

    References listed on IDEAS

    as
    1. 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.
    2. 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.
    3. 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.
    4. Ahmed, I. & Gupta, A.K., 2009. "Characteristics of cardboard and paper gasification with CO2," Applied Energy, Elsevier, vol. 86(12), pages 2626-2634, December.
    5. 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.
    6. 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.
    7. 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.
    Full references (including those not matched with items on IDEAS)

    Citations

    Citations are extracted by the CitEc Project, subscribe to its RSS feed for this item.
    as


    Cited by:

    1. Liu, Jiaxun & Yang, Xiuchao & Liu, Jianguo & Jiang, Xiumin, 2024. "Microscopic pyrolysis mechanisms of superfine pulverized coal based on TG-FTIR-MS and ReaxFF MD study," Energy, Elsevier, vol. 289(C).
    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.
    3. 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.

    Most related items

    These are the items that most often cite the same works as this one and are cited by the same works as this one.
    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. 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.
    3. 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.
    4. 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.
    5. Nipattummakul, Nimit & Ahmed, Islam I. & Kerdsuwan, Somrat & Gupta, Ashwani K., 2012. "Steam gasification of oil palm trunk waste for clean syngas production," Applied Energy, Elsevier, vol. 92(C), pages 778-782.
    6. Guangul, Fiseha M. & Sulaiman, Shaharin A. & Ramli, Anita, 2014. "Study of the effects of operating factors on the resulting producer gas of oil palm fronds gasification with a single throat downdraft gasifier," Renewable Energy, Elsevier, vol. 72(C), pages 271-283.
    7. Déparrois, N. & Singh, P. & Burra, K.G. & Gupta, A.K., 2019. "Syngas production from co-pyrolysis and co-gasification of polystyrene and paper with CO2," Applied Energy, Elsevier, vol. 246(C), pages 1-10.
    8. 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.
    9. Udomsirichakorn, Jakkapong & Salam, P. Abdul, 2014. "Review of hydrogen-enriched gas production from steam gasification of biomass: The prospect of CaO-based chemical looping gasification," Renewable and Sustainable Energy Reviews, Elsevier, vol. 30(C), pages 565-579.
    10. Zhan, Xiuli & Zhou, ZhiJie & Wang, Fuchen, 2010. "Catalytic effect of black liquor on the gasification reactivity of petroleum coke," Applied Energy, Elsevier, vol. 87(5), pages 1710-1715, May.
    11. Chen, Wei-Hsin & Lin, Bo-Jhih, 2013. "Hydrogen and synthesis gas production from activated carbon and steam via reusing carbon dioxide," Applied Energy, Elsevier, vol. 101(C), pages 551-559.
    12. Mohammad I. Jahirul & Mohammad G. Rasul & Ashfaque Ahmed Chowdhury & Nanjappa Ashwath, 2012. "Biofuels Production through Biomass Pyrolysis —A Technological Review," Energies, MDPI, vol. 5(12), pages 1-50, November.
    13. Xu, Z.R. & Zhu, W. & Li, M. & Zhang, H.W. & Gong, M., 2013. "Quantitative analysis of polycyclic aromatic hydrocarbons in solid residues from supercritical water gasification of wet sewage sludge," Applied Energy, Elsevier, vol. 102(C), pages 476-483.
    14. 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.
    15. 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.
    16. Zhang, Qinglin & Dor, Liran & Fenigshtein, Dikla & Yang, Weihong & Blasiak, Wlodzmierz, 2012. "Gasification of municipal solid waste in the Plasma Gasification Melting process," Applied Energy, Elsevier, vol. 90(1), pages 106-112.
    17. Kantarelis, E. & Yang, W. & Blasiak, W. & Forsgren, C. & Zabaniotou, A., 2011. "Thermochemical treatment of E-waste from small household appliances using highly pre-heated nitrogen-thermogravimetric investigation and pyrolysis kinetics," Applied Energy, Elsevier, vol. 88(3), pages 922-929, March.
    18. Zhou, Chunguang & Zhang, Qinglin & Arnold, Leonie & Yang, Weihong & Blasiak, Wlodzimierz, 2013. "A study of the pyrolysis behaviors of pelletized recovered municipal solid waste fuels," Applied Energy, Elsevier, vol. 107(C), pages 173-182.
    19. Arpa, Orhan & Yumrutas, Recep & Demirbas, Ayhan, 2010. "Production of diesel-like fuel from waste engine oil by pyrolitic distillation," Applied Energy, Elsevier, vol. 87(1), pages 122-127, January.
    20. Singh, P. & Déparrois, N. & Burra, K.G. & Bhattacharya, S. & Gupta, A.K., 2019. "Energy recovery from cross-linked polyethylene wastes using pyrolysis and CO2 assisted gasification," Applied Energy, Elsevier, vol. 254(C).

    Corrections

    All material on this site has been provided by the respective publishers and authors. You can help correct errors and omissions. When requesting a correction, please mention this item's handle: RePEc:eee:appene:v:88:y:2011:i:12:p:4667-4677. See general information about how to correct material in RePEc.

    If you have authored this item and are not yet registered with RePEc, we encourage you to do it here. This allows to link your profile to this item. It also allows you to accept potential citations to this item that we are uncertain about.

    If CitEc recognized a bibliographic reference but did not link an item in RePEc to it, you can help with this form .

    If you know of missing items citing this one, you can help us creating those links by adding the relevant references in the same way as above, for each refering item. If you are a registered author of this item, you may also want to check the "citations" tab in your RePEc Author Service profile, as there may be some citations waiting for confirmation.

    For technical questions regarding this item, or to correct its authors, title, abstract, bibliographic or download information, contact: Catherine Liu (email available below). General contact details of provider: http://www.elsevier.com/wps/find/journaldescription.cws_home/405891/description#description .

    Please note that corrections may take a couple of weeks to filter through the various RePEc services.

    IDEAS is a RePEc service. RePEc uses bibliographic data supplied by the respective publishers.