Journal
BIORESOURCE TECHNOLOGY
Volume 320, Issue -, Pages -Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124328
Keywords
Straw; Torrefaction; Functional groups; Nitrogen
Funding
- Fundamental Research Funds for the Central Universities [2020QN61]
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The evolution of CHON functional groups during torrefaction of rice straw at 200-300 degrees C was investigated. Results showed that 300 degrees C was more suitable for rice straw torrefaction due to ideal fuel ratio and significantly improved HHV. The release of N-containing gases during torrefaction should be highly concerned for environmental perspective.
The evolution of CHON functional groups during torrefaction of rice straw at 200-300 degrees C were investigated. The results showed that 300 degrees C was more suitable for rice straw torrefaction due to the ideal fuel ratio, energy densification, energy-mass co-benefit index and the significantly improved HHV of the torrefied products. The functional groups such as O-H, N-H, C-H, C = O in the solids decreased with rising temperature accompanied by the releases of H2O, CH4, CO2, CO and NH3, et al. At 300 degrees C, 40.04% of fuel-N was released in the form of NH3, HCN, HNCO et al. due to the decomposition of N-A which was the overall N-functionality in the raw rice straw. It is worth noting that the absorbance of NH3 and HCN has the same order of magnitude as CO. Therefore, the releases of N-containing gases should be highly concerned for the application of torrefaction technology from the environmental perspective.
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