Chemical looping gasification of maceral from low-rank coal: Products distribution and kinetic analysis on vitrinite

doi:10.1016/j.cjche.2020.11.021

Chinese Journal of Chemical Engineering ›› 2021, Vol. 36 ›› Issue (8): 233-241.DOI: 10.1016/j.cjche.2020.11.021

Chemical looping gasification of maceral from low-rank coal: Products distribution and kinetic analysis on vitrinite

Bo Zhang, Bolun Yang, Wei Guo, Song Wu, Jie Zhang, Zhiqiang Wu

Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China

Received:2020-08-31 Revised:2020-10-22 Online:2021-09-30 Published:2021-08-28
Contact: Zhiqiang Wu
Supported by:
The authors gratefully acknowledges the support of the National Natural Science Foundation of China (22038011, 51976168), the K. C. Wong Education Foundation, China Postdoctoral Science Foundation (2019M653626), Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2020-KF-06), the Promotion Plan for Young People of Shaanxi Association for Science and Technology (20180402), and the Technology Foundation for Selected Overseas Chinese Scholar in Shaanxi Province (2018015).

Chemical looping gasification of maceral from low-rank coal: Products distribution and kinetic analysis on vitrinite

Bo Zhang, Bolun Yang, Wei Guo, Song Wu, Jie Zhang, Zhiqiang Wu

Shaanxi Key Laboratory of Energy Chemical Process Intensification, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, 710049, China

通讯作者: Zhiqiang Wu
基金资助:
The authors gratefully acknowledges the support of the National Natural Science Foundation of China (22038011, 51976168), the K. C. Wong Education Foundation, China Postdoctoral Science Foundation (2019M653626), Foundation of State Key Laboratory of High-efficiency Utilization of Coal and Green Chemical Engineering (2020-KF-06), the Promotion Plan for Young People of Shaanxi Association for Science and Technology (20180402), and the Technology Foundation for Selected Overseas Chinese Scholar in Shaanxi Province (2018015).

Abstract

Abstract: The product distribution and kinetic analysis of low-rank coal vitrinite were investigated during the chemical looping gasification (CLG) process. The acid washing method was used to treat low-rank coal, and the density gradient centrifugation method was adopted to obtain the coal macerals. By combining thermogravimetric analysis and online mass spectrometry, the influence of the heating rate and oxygen carrier (Fe₂O₃) blending ratio on product distribution was discussed. The macroscopic kinetic parameters were solved by the Kissinger-Akahira-Sunose (KAS) method, and the main gaseous product formation kinetic parameters were solved by the iso-conversion method. The results of vitrinite during slow heating chemical looping gasification showed that the main weight loss interval was 400-600℃, and the solid yield of sample vitrinite-Fe-10 at different heating rates was 64.30%-69.67%. When β=20℃·min^-1, the maximum decomposition rate of vitrinite-Fe-10 was -0.312%·min^-1. The addition of Fe₂O₃ reduced the maximum decomposition rate, but by comparing the chemical looping conversion characteristic index, it could be inferred that the chemical looping gasification of vitrinite might produce volatile substances higher than the pyrolysis process of vitrinite alone. The average activation energy of the reaction was significantly reduced during chemical looping gasification of vitrinite, which was lower than the average activation energy of 448.69 kJ·mol^-1 during the pyrolysis process of vitrinite alone. The gaseous products were mainly CO and CO₂. When the heating rate was 10℃·min^-1, the highest activation energy for CH₄ formation was 21.353 kJ·mol^-1, and the lowest activation energy for CO formation was 9.7333 kJ·mol^-1. This study provides basic data for exploring coal chemical looping gasification mechanism and reactor design by studying the chemical looping gasification process of coal macerals.

Key words: Coal, Vitrinite, Chemical looping process, Gasification, Products distribution, Reaction kinetics

摘要： The product distribution and kinetic analysis of low-rank coal vitrinite were investigated during the chemical looping gasification (CLG) process. The acid washing method was used to treat low-rank coal, and the density gradient centrifugation method was adopted to obtain the coal macerals. By combining thermogravimetric analysis and online mass spectrometry, the influence of the heating rate and oxygen carrier (Fe₂O₃) blending ratio on product distribution was discussed. The macroscopic kinetic parameters were solved by the Kissinger-Akahira-Sunose (KAS) method, and the main gaseous product formation kinetic parameters were solved by the iso-conversion method. The results of vitrinite during slow heating chemical looping gasification showed that the main weight loss interval was 400-600℃, and the solid yield of sample vitrinite-Fe-10 at different heating rates was 64.30%-69.67%. When β=20℃·min^-1, the maximum decomposition rate of vitrinite-Fe-10 was -0.312%·min^-1. The addition of Fe₂O₃ reduced the maximum decomposition rate, but by comparing the chemical looping conversion characteristic index, it could be inferred that the chemical looping gasification of vitrinite might produce volatile substances higher than the pyrolysis process of vitrinite alone. The average activation energy of the reaction was significantly reduced during chemical looping gasification of vitrinite, which was lower than the average activation energy of 448.69 kJ·mol^-1 during the pyrolysis process of vitrinite alone. The gaseous products were mainly CO and CO₂. When the heating rate was 10℃·min^-1, the highest activation energy for CH₄ formation was 21.353 kJ·mol^-1, and the lowest activation energy for CO formation was 9.7333 kJ·mol^-1. This study provides basic data for exploring coal chemical looping gasification mechanism and reactor design by studying the chemical looping gasification process of coal macerals.

关键词: Coal, Vitrinite, Chemical looping process, Gasification, Products distribution, Reaction kinetics

Bo Zhang, Bolun Yang, Wei Guo, Song Wu, Jie Zhang, Zhiqiang Wu. Chemical looping gasification of maceral from low-rank coal: Products distribution and kinetic analysis on vitrinite[J]. Chinese Journal of Chemical Engineering, 2021, 36(8): 233-241.

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Chemical looping gasification of maceral from low-rank coal: Products distribution and kinetic analysis on vitrinite

Chemical looping gasification of maceral from low-rank coal: Products distribution and kinetic analysis on vitrinite

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