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bce ›› 2017, Vol. 51 ›› Issue (4): 8-16.doi: 10.3969/j.issn.1673-5854.2017.04.002

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Analysis Method of Cellulose Pyrolysis Dynamics

BAI Bin1, ZHOU Weihong1, DING Yifei2, XU Anzhuang1, WANG Yujie1, DING Weijing1   

  1. 1. School of Civi Engineering, University of Science and Technology Liaoning, Anshan 114051, China;
    2. Ansteel Engineering Technology Co., Ltd., Anshan 114021, China
  • Received:2016-10-16 Online:2017-07-30 Published:2017-08-03

Abstract: With microcrystalline cellulose as raw material, cellulose pyrolysis experiments under different heating rates were carried out in nitrogen atmosphere by thermogravimetric analyzer, and the pyrolysis kinetic characteristics of cellulose were analyzed. The most probable reaction mechanism function was selected from 41 mechanism functions of thermal analysis kinetics by using the double equal-double steps method and Popescu method, meanwhile, four different thermal analysis methods (Freeman-Carroll method, Coats-Redfern method, Starink method, double equal-double steps method) were used to calculate the activation energy (E) and pre exponential factor (A) of pyrolysis reaction, and the results were analyzed and compared. The results showed that with the increase of the heating rate, the initial pyrolysis temperature of cellulose increased and the rate of pyrolysis weight loss increased; the pyrolysis process of cellulose could be divided into 4 stages, dehydration preheating section (40-120℃), the early period of pyrolysis (120-260℃), the main pyrolysis section (260-400℃) and carbonization section (400-900℃); the main cellulose pyrolysis section was divided into two stages and the activation energies at low temperature (260-350℃) and high temperature (350-400℃) were 166-176 kJ/mol and 171-216 kJ/mol, respectively; anti Jander kinetic model could describe the reaction process of main pyrolysis well; by using single scanning rate method (Freeman-Carroll and Coats-Redfern), the analysis result had a great deviation from the actual value, and the results obtained by the multiple scan rate method were more reliable.

Key words: cellulose, pyrolysis, thermogravimetric analysis, dynamics

CLC Number: