Title :
The modified model for pyrolysis of cylindrical wood
Author :
Xinzhi Liu ; Jianfeng Shen ; Shuguang Zhu ; Houlei Zhang ; Bin Li
Author_Institution :
Sch. of Energy & Power Eng., Nanjing Univ. of Sci. & Technol., Nanjing, China
Abstract :
Pyrolysis is known as one of the promising thermochemical conversion techniques in producing solid (charcoal), liquid (tar) and gaseous products. In the present study, deposition coefficient, i.e. the fraction of volatile and gases deposited on the char due to the secondary reaction, is introduced to modify the chemical kinetics model and the heat transfer model. The fourth order Runge-Kutta method is used to solve the kinetic model and the tri-diagonal matrix algorithm is used to solve the heat transfer model for cylindrical wood with the radius in the range 0.003 m ~ 0.011 m and the final pyrolysis temperature in the range 623 K ~ 780 K. The numerical results provide the final pyrolysis time and the effects of secondary reaction. As the wood radius increases, the final pyrolysis time and the effect of secondary reaction increase. Finally, the model developed in the present study is validated by experimental data. It is shown that the simulating results based on the modified model agree well with experimental results and are better than that based on models in literatures which does not consider deposition coefficient.
Keywords :
Runge-Kutta methods; chemical energy conversion; heat transfer; matrix algebra; pyrolysis; reaction kinetics; wood products; chemical kinetics model; cylindrical wood pyrolysis; deposition coefficient; fourth order Runge-Kutta method; gaseous product; heat transfer model; liquid product; pyrolysis time; secondary reaction effect; solid product; thermochemical conversion techniques; tridiagonal matrix algorithm; Biological system modeling; Biomass; Data models; Gases; Heat transfer; Mathematical model; Temperature distribution; biomass; chemical kinetics model; deposition coefficient; heat transfer mode; pyrlysis;
Conference_Titel :
Materials for Renewable Energy and Environment (ICMREE), 2013 International Conference on
Print_ISBN :
978-1-4799-3335-8
DOI :
10.1109/ICMREE.2013.6893678