Effects of cellulose, hemicellulose and lignin on biomass pyrolysis kinetics
- PDF / 408,937 Bytes
- 9 Pages / 595 x 842 pts (A4) Page_size
- 65 Downloads / 265 Views
pISSN: 0256-1115 eISSN: 1975-7220
INVITED REVIEW PAPER
INVITED REVIEW PAPER
Effects of cellulose, hemicellulose and lignin on biomass pyrolysis kinetics Lingli Zhu and Zhaoping Zhong† Key Laboratory of Energy Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, P. R. China (Received 7 December 2019 • Revised 1 April 2020 • Accepted 4 April 2020) AbstractIn order to investigate interactions among biomass components on pyrolysis kinetics, pyrolysis experiments of individual components, synthetic biomass (designed by Design-Export software) and natural biomass (rice husk and corn straw) were conducted on a thermogravimetric analyzer (TGA). The results revealed that the pyrolysis behavior of cellulose is sharp, which is with low pyrolysis reaction order (1.38), high activation energy (168.61 kJ/mol) and high pre-exponential factor (3.50E+12 /s). The pyrolysis behavior of hemicellulose and lignin is slower but more complicated, both with high pyrolysis reaction order (2.30, 1.51), low activation energy (126.31, 87.21 kJ/mol), and low pre-exponential factor (9.67E+09, 2.59E+05 /s). Comparison of the experimental and calculated kinetics of synthetic samples confirmed that interactive effects on pyrolysis kinetics exist in the co-pyrolysis process. In particular, the presence of lignin inhibited the pyrolysis reaction rate of synthetic biomass, and cellulose played the dominant role in the activation energy and frequency factor. The pyrolysis reaction order was strongly influenced by hemicellulose owing to its abundant and complex branched chains. The predicted model was also established for calculating kinetic parameters of natural biomass with known proportions of three components. The predicted results were consistent with the experimental ones, validating the effectiveness of the prediction model. Keywords: Biomass Components, Pyrolysis, Kinetics, Interactive Effects, Prediction
compose by reason of connected phenylpropane units. Natural biomass pyrolysis is considered as a comprehensive performance of the co-pyrolysis of cellulose, hemicellulose and lignin. The interaction among three biomass components during copyrolysis process is commonly evaluated by their pyrolysis behavior and product characteristics. Pang et al. predicted natural biomass pyrolysis profiles in the assumption of the pyrolysis behavior of three biomass components were mutually independent during co-pyrolysis process, and the predicted results were with some degree of accuracy [3]. Yang et al. studied the thermogravimetric characteristics of three biomass components on a TGA [4]. The pyrolysis results of synthesized biomass samples indicated that the interaction among three biomass components were trivial. On the contrary, some other researchers declared that the pyrolysis behavior of natural or synthesized biomass cannot be deemed the simple superposition of cellulose, hemicellulose, lignin accounting for their obvious interactions. Liu et al. observed the existence o
Data Loading...
