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ABSTRACT
The influence of torrefaction temperature on biomass pyrolysis was studied by thermogravimetric with precise temperature control to simulate the real experimental condition. The torrefaction and pyrolysis experiments of three components (cellulose, hemicellulose and lignin) of biomass were carried out in the thermogravimetric analyzer. The results show that the weight loss of hemicellulose was significant at T200 (the torrefaction of 200℃) and T250 (the torrefaction of 250℃). When the torrefaction temperature was increased to 300°C, 74.4 wt% of cellulose was lost in the heat holding stage, and 61.9 wt% of hemicellulose was lost, while the thermal degradation of lignin is slight. According to the results of pyrolysis experiments, the pyrolysis of hemicellulose was easier with the increase of torrefaction temperature. The T300 (the torrefaction of 300℃) had great effect on cellulose and the weight loss peak basically disappeared. Lignin showed a similar trend, but the maximum weight loss peak moved to high temperature with the increase of torrefaction temperature. Torrefaction can promote the production of H2 during cellulose pyrolysis, and the maximum impact was observed at T300. T200 inhibited the formation of H2, CH4, CO products from hemicellulose and lignin pyrolysis, while T250 and T300 promoted. Compared with the raw cellulose pyrolysis, the activation energy of the samples after torrefaction at T200 and T250 increased, but decreased to 152.19 KJ/mol at T300. With the increase of torrefaction temperature, the unstable side-chain structure of most hemicellulose and a fraction of lignin were decomposed at T200 and T250, resulting in a trend of activation energy initially increasing and then decreasing.
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Yanyang Mei
Yanyang Mei is currently working as Assistant Professor in the School of Mechanical and Power Engineering, Henan Polytechnic University, Jiaozuo, China. He received his PhD in Thermal Power Engineering in 2017 from Huazhong University of Science and Technology, China. His research interests are efficient utilization technology of biomass.
Yanxin Zheng
Yanxin Zheng is currently studying as a postgraduate in the Henan Polytechnic University, Jiaozuo, China. He will receive his Master degree in Major in energy power in 2024 from Henan Polytechnic University, China. His research interests are torrefaction pretreatment and its effect on pyrolysis characteristics of biomass.
Hongchuan Chai
Hongchuan Chai is from Lanzhou, China, and he has now received his master’s degree in Major in energy power at Henan Polytechnic University. His research interests are co-pyrolysis characteristics of biomass and low-rank pulverized coal.
Ying Chen
Ying Chen is currently studying as a postgraduate in the Henan Polytechnic University, Jiaozuo, China. She will receive her Master of Engineering in fluid machinery and engineering in 2024 from Henan Polytechnic University, China. Her research interests are intensive torrefaction and pellets technologies of biomass.