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Chemistry and Industry of Forest Products ›› 2018, Vol. 38 ›› Issue (4): 95-102.doi: 10.3969/j.issn.0253-2417.2018.04.015

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Characterization and Kinetic of Co-pyrolysis of Coal and Salix Under CO2/N2 Atmospheres

GONG Juhui, SHAO Tingting, WANG Kebing   

  1. College of Science, Inner Mongolia Agricultural University, Huhhot 010018, China
  • Received:2018-01-16 Online:2018-08-25 Published:2018-08-10

Abstract: The pyrolysis of coal,Salix psammophila and mixture of salix and coal(mass ratio coal of salix 1:4,5:5,4:1) under different V(CO2):V(N2) (1:4,5:5,4:1) atmosphere were analyzed by using temperature programmed thermogravimetric analysis. Pyrolysis kinetic parameters were obtained by Coats-Redfern method after the experiment. The interaction between salix and coal were studied. The experimental results showed that the two main pyrolysis temperature sections overlapped each other.When V(CO2):V(N2) was 5:5, the co-pyrolysis of coal and salix with different blends of coal and salix mixtures had promoting effect and the effect was weaker and weaker with the increase of the content of salix. When m(coal):m(salix) was 5:5, the larger the proportion of CO2 atmosphere under different atmosphere proportion at high temperature pyrolysis was, the stronger the interaction between Salix psammophila and coal was. The pyrolysis kinetics analysis by Coats-Redfern method showed that the activation energies were 15-70 kJ/mol, and the activation energy of salix was higher than that of coal. The activation energy required for the high temperature section was greater than that for the low temperature section. Both the CO2/N2 atmosphere ratio and the salix/coal ratio had a certain influence on the activation energy and pre-exponential factors. When V(CO2):V(N2) was 5:5, with the increase of salix in the mixture, and when m(coal):m(salix) was 5:5, with the increase of CO2, the activation energy of the mixture and the change trend of the pre-exponential factor both increased first and then decreased.

Key words: coal, salix, kinetics, thermal gravimetric analysis, interaction effect

CLC Number: