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Mass transfer studies during CO2 gasification of torrefied and pyrolyzed chars

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  • Vincent, Shubha Shalini
  • Mahinpey, Nader
  • Aqsha, Aqsha

Abstract

A comparative study on CO2 gasification kinetics of flax straw char produced by two different processes, namely, torrefaction and pyrolysis was investigated using a TGA (thermogravimetric analyzer). The objective of this research was to investigate the diffusion and surface reactions that occur during the CO2 gasification of the torrefied and pyrolyzed char particles. Gasification experiments were carried out at four different gasification temperatures from 750 to 900 °C and for different particle sizes (<90 μm–925 μm). The effects of temperature, particle size, and the char type on the rate of CO2 gasification were determined. The 50% conversion rate showed an increase in the reactivity values, along with an increase in the temperature, and decreased with an increase in the particle size for both the char types. The diffusional parameters such as effective diffusivity, effectiveness factor, and the DLI (diffusion limitation index) were calculated from the experimental data for both the char types. BET (Brunauer-Emmett-Teller) analysis and SEM (Scanning Electron Microscopy) analysis were performed to determine the surface area and to study the structural morphology of the char types. Torrefied char had a greater surface area than the pyrolyzed char.

Suggested Citation

  • Vincent, Shubha Shalini & Mahinpey, Nader & Aqsha, Aqsha, 2014. "Mass transfer studies during CO2 gasification of torrefied and pyrolyzed chars," Energy, Elsevier, vol. 67(C), pages 319-327.
    • Handle: RePEc:eee:energy:v:67:y:2014:i:c:p:319-327
    DOI: 10.1016/j.energy.2013.12.034
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    1. Prins, Mark J. & Ptasinski, Krzysztof J. & Janssen, Frans J.J.G., 2006. "More efficient biomass gasification via torrefaction," Energy, Elsevier, vol. 31(15), pages 3458-3470.
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    2. Tian, Hong & Hu, Qingsong & Wang, Jiawei & Chen, Donglin & Yang, Yang & Bridgwater, Anthony V., 2021. "Kinetic study on the CO2 gasification of biochar derived from Miscanthus at different processing conditions," Energy, Elsevier, vol. 217(C).
    3. Hu, Fan & Xiong, Biao & Liu, Xuhui & Huang, Xiaohong & Li, Yu & Liu, Zhaohui, 2023. "Optimized TGA-based experimental method for studying intrinsic kinetics of coal char oxidation under moderate or intense low-oxygen dilution oxy-fuel conditions," Energy, Elsevier, vol. 265(C).
    4. Hu, Fan & Xiong, Biao & Huang, Xiaohong & Liu, Zhaohui, 2023. "Theoretical analysis and experimental verification of diminishing the diffusion influence on determination of char oxidation kinetics by thermo-gravimetric analysis," Energy, Elsevier, vol. 275(C).
    5. Lopez, Gartzen & Alvarez, Jon & Amutio, Maider & Arregi, Aitor & Bilbao, Javier & Olazar, Martin, 2016. "Assessment of steam gasification kinetics of the char from lignocellulosic biomass in a conical spouted bed reactor," Energy, Elsevier, vol. 107(C), pages 493-501.
    6. Baath, Yuvraj Singh & Nikrityuk, Petr A. & Gupta, Rajender, 2022. "Experimental and numerical verifications of biochar gasification kinetics using TGA," Renewable Energy, Elsevier, vol. 185(C), pages 717-733.

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