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Volume 41 Issue 8
Aug.  2023
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Article Navigation >  ENVIRONMENTAL ENGINEERING  > 2023  >  41(8): 137-144,168
XING Yutong, ZHANG Yiwei, LU Ping. COMBUSTION AND PYROLYSIS CHARACTERISTICS OF HYDROCHARS BY CO-HYDROTHERMAL CARBONIZATION OF VISCOSE FIBER AND POPLAR WOOD[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 137-144,168. doi: 10.13205/j.hjgc.202308017
Citation: XING Yutong, ZHANG Yiwei, LU Ping. COMBUSTION AND PYROLYSIS CHARACTERISTICS OF HYDROCHARS BY CO-HYDROTHERMAL CARBONIZATION OF VISCOSE FIBER AND POPLAR WOOD[J]. ENVIRONMENTAL ENGINEERING , 2023, 41(8): 137-144,168. doi: 10.13205/j.hjgc.202308017
shu

COMBUSTION AND PYROLYSIS CHARACTERISTICS OF HYDROCHARS BY CO-HYDROTHERMAL CARBONIZATION OF VISCOSE FIBER AND POPLAR WOOD

doi: 10.13205/j.hjgc.202308017

  • School of Energy and Mechanical Engineering, Nanjing Normal University, Nanjing 210023, China

  • Received Date: 2022-09-01
    Available Online: 2023-11-15
    Abstract
  • Hydrothermal carbonization is a promising method for pretreatments of high moisture biomass and organic solid wastes. In this paper, hydrochars were prepared from two raw samples of viscose fiber (VF) and poplar wood (PW) in a hydrothermal reactor, the effects of the blending ratio of raw materials on proximate analysis, ultimate analysis, and caloric value of as-prepared hydrochars, and the combustion and pyrolysis characteristics of hydrochars were evaluated by the thermogravimetric analyzer. The results indicated that hydrothermal carbonization can improve the fuel characteristics of raw materials, the contents of fixed carbon and oxygen in raw materials increased significantly from 8.48% and 41.94% to 54.28% and 73.89%, respectively, and the relevant calorific value achieved 29.22 MJ/kg; at the same time, the contents of volatile matter and oxygen decreased significantly from 87.02% and 62.45% to 45.01% and 20.19%, respectively. Through co-hydrothermal pretreatment of raw materials, on one hand, the temperature interval of hydrochar pyrolysis was extended, and the relevant pyrolysis activation energy was decreased; on the other hand, the ignition and combustion characteristics were improved significantly, which made the maximum combustion rate temperature and its temperature interval shift towards a higher temperature zone, and the activation energy of combustion reaction was decreased. The stability of combustion and pyrolysis of hydrochars was enhanced with the increase of the blending ratio of viscose fiber. When the blending ratio of viscose fiber to poplar wood was 5∶5, the comprehensive pyrolysis index, comprehensive combustion index, and ignition index all achieved the maximum values of 6.13×10-8, 9.64×10-7 and 5.27×10-5, respectively. This study showes that the co-hydrothermal of viscose fibers with poplar, to gain high mass solid fuel, effectively improves the shortcomings of hydrothermal carbonization of single raw materials, and provides a reference for the energy utilization of solid waste such as viscose fiber.
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