4.8 Article

Gas-pressurized torrefaction of biomass wastes: The optimization of pressurization condition and the pyrolysis of torrefied biomass

期刊

BIORESOURCE TECHNOLOGY
卷 319, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124216

关键词

Biomass; Gas-pressurized torrefaction; Pressure; Pyrolysis

资金

  1. National Key Research and Development Program of China [SQ2019YFC190252]
  2. National Natural Science Foundation of China [21776109]
  3. Talented Young Scientist Program
  4. Double first-class research funding of China-EU Institute for Clean and Renewable Energy [ICARERP-2018-BIOMASS-003]
  5. foundation of State Key Laboratory of Coal Combustion (FSKLCCA2011)

向作者/读者索取更多资源

The novel gas-pressurized (GP) torrefaction process showed improved properties of biomass pyrolysis products with an optimal operating pressure of 1.7 MPa. Compared to conventional torrefaction, GP torrefaction reduced acid content in bio-oil and increased the calorific value of biogas.
A novel gas-pressurized (GP) torrefaction with high oxygen removal efficiency at mild temperature was proposed in our previous work. However, the optimal condition of the GP torrefaction and subsequent pyrolysis of the torrefied biomass were not clear. In this work, the effect of pressure on the GP torrefaction and pyrolysis product properties of the torrefied biomass were studied in detail. The results show that the pressure increasing from 1.7 MPa to 5.0 MPa just slightly contributed to further oxygen removal, and 1.7 MPa was thus selected as the optimum pressure. The GP torrefaction significantly improved the product property of biomass pyrolysis compared to the conventional torrefaction (AP torrefaction). The acids content in bio-oil was reduced from 15-20% to less than 5%, and the calorific value of biogas increased to as high as 16.57-19.31 MJ/Nm(3). Furthermore, an overall conversion mechanism of combined GP torrefaction and subsequent pyrolysis of biomass was proposed.

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