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Upgrading of waste biomass by hydrothermal carbonization (HTC) and low temperature pyrolysis (LTP): A comparative evaluation

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  • Liu, Zhengang
  • Balasubramanian, Rajasekhar

Abstract

Hydrothermal carbonization (HTC) and low temperature pyrolysis (LTP) were compared on the basis of fuel qualities of biochars obtained from the upgrading of raw biomass in the present study. The results showed that the hydrothermally prepared biochar had higher energy density while the pyrolytic biochar had higher energy yield due to higher biochar yield. Nearly 100% major ash-forming metals were retained in the pyrolytic biochars while the contents of these metals in hydrothermally prepared biochars were less than 40% relative to those of raw biomass, especially for Na and K (less than 11% retention rate). The reactivities of pyrolytic biochars were higher than their respective raw biomass and the main mass loss occurred at low temperatures. The higher combustion temperature ranges and sharply decreased residue suggested that higher thermal efficiency and lower pollutant emissions could be achieved with the hydrothermally prepared biochars than with pyrolytic biochars. As for the process kinetics, HTC showed lower activation energy in the temperature range of 150–300°C in spite of deeper decomposition and carbonization of biomass as compared to LTP.

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  • Liu, Zhengang & Balasubramanian, Rajasekhar, 2014. "Upgrading of waste biomass by hydrothermal carbonization (HTC) and low temperature pyrolysis (LTP): A comparative evaluation," Applied Energy, Elsevier, vol. 114(C), pages 857-864.
    • Handle: RePEc:eee:appene:v:114:y:2014:i:c:p:857-864
    DOI: 10.1016/j.apenergy.2013.06.027
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    References listed on IDEAS

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    1. Saidur, R. & Abdelaziz, E.A. & Demirbas, A. & Hossain, M.S. & Mekhilef, S., 2011. "A review on biomass as a fuel for boilers," Renewable and Sustainable Energy Reviews, Elsevier, vol. 15(5), pages 2262-2289, June.
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    3. Park, Sang-Woo & Jang, Cheol-Hyeon & Baek, Kyung-Ryul & Yang, Jae-Kyung, 2012. "Torrefaction and low-temperature carbonization of woody biomass: Evaluation of fuel characteristics of the products," Energy, Elsevier, vol. 45(1), pages 676-685.
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