Modeling coal pyrolysis in a cocurrent downer reactor--颗粒学报PARTICUOLOGY

Zhang, Y., Zhao, Y., & He, X. (2015). Modeling coal pyrolysis in a cocurrent downer reactor. Particuology, 21, 154-159. https://doi.org/10.1016/j.partic.2014.06.015

Modeling coal pyrolysis in a cocurrent downer reactor

Yan Zhang ^{a b}, Yuehong Zhao ^a, Xianfeng He ^a^*

a State Key Laboratory of Multiphase Complex Systems, Institute of Process Engineering, Chinese Academy of Sciences, Beijing 100190, China
b University of Chinese Academy of Sciences, Beijing 100049, China

10.1016/j.partic.2014.06.015

Volume 21, August 2015, Pages 154-159

Received 21 January 2014, Revised 29 April 2014, Accepted 22 June 2014, Available online 27 December 2014, Version of Record 6 June 2015.

E-mail: xfhe@ipe.ac.cn

Highlights

• A model combining coal pyrolysis kinetics with hydrodynamic in a downer reactor was developed.

• Yields of key pyrolysis products and hydrodynamic characteristics could be predicted.

• Calculated results via this model showed reasonable agreements with experimental data.

Abstract

In this paper, a model for fast coal pyrolysis in a cocurrent downer reactor is developed, in which both hydrodynamics and coal pyrolysis kinetics are simultaneously considered. The results of simulations based on this model display reasonable agreement with experimental data obtained using Huolinhe coal as the feedstock, and this model is therefore suitable for predicting the fast pyrolysis of specific coal types. A series of simulations of fast coal pyrolysis in a cocurrent downer demonstrated that coal devolatilization is almost complete in the inlet region within a time span of 0.4 s, and that higher temperatures improve the pyrolysis efficiency. However, the yield of liquid products is decreased with increasing pyrolysis temperatures, especially above 670 °C, because of additional cracking of the liquids.

Graphical abstract

Keywords

Coal pyrolysis; Model; Cocurrent downer; Low-rank coal

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