The effect of hydrothermal pretreatment on the structure and fast pyrolysis behaviors of ShengLi lignite

doi:10.1016/j.cjche.2021.05.006

中国化学工程学报 ›› 2021, Vol. 35 ›› Issue (7): 265-274.DOI: 10.1016/j.cjche.2021.05.006

• Energy Science and Technology • 上一篇下一篇

The effect of hydrothermal pretreatment on the structure and fast pyrolysis behaviors of ShengLi lignite

Boyang Bai, Luyao Qiang, Suisui Zhang, Zhiwei Peng, Hang Mu, Xiaoxun Ma

School of Chemical Engineering, Northwest University, Xi'an 710069, China;International Scientific and Technological Cooperation Base of the Ministry of Science and Technology (MOST) for Clean Utilization of Hydrocarbon Resources, Xi'an 710069, China;Chemical Engineering Research Center of the Ministry of Education (MOE) for Advanced Use Technology of Shanbei Energy, Xi'an 710069, China;Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi'an 710069, China;Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, China

收稿日期:2021-02-06 修回日期:2021-05-12 出版日期:2021-07-28 发布日期:2021-09-30
通讯作者: Xiaoxun Ma
基金资助:
This work was supported by the National Natural Science Foundation of China (21536009), and Science and Technology Plan Projects of Shaanxi Province (2017ZDCXL-GY-10-03).

The effect of hydrothermal pretreatment on the structure and fast pyrolysis behaviors of ShengLi lignite

Boyang Bai, Luyao Qiang, Suisui Zhang, Zhiwei Peng, Hang Mu, Xiaoxun Ma

School of Chemical Engineering, Northwest University, Xi'an 710069, China;International Scientific and Technological Cooperation Base of the Ministry of Science and Technology (MOST) for Clean Utilization of Hydrocarbon Resources, Xi'an 710069, China;Chemical Engineering Research Center of the Ministry of Education (MOE) for Advanced Use Technology of Shanbei Energy, Xi'an 710069, China;Shaanxi Research Center of Engineering Technology for Clean Coal Conversion, Xi'an 710069, China;Collaborative Innovation Center for Development of Energy and Chemical Industry in Northern Shaanxi, Xi'an 710069, China

Received:2021-02-06 Revised:2021-05-12 Online:2021-07-28 Published:2021-09-30
Contact: Xiaoxun Ma
Supported by:
This work was supported by the National Natural Science Foundation of China (21536009), and Science and Technology Plan Projects of Shaanxi Province (2017ZDCXL-GY-10-03).

摘要/Abstract

摘要： The structure and composition of coal determine its fast pyrolysis characteristics, and the study of the relationship between them can play an important role in the efficient and clean utilization of coal. So, in this work, hydrothermal pretreatment was used to artificially change the structure and composition of ShengLi (SL) lignite, which was used to investigate the influence of structural changes on pyrolysis. The physicochemicalstructure and composition of samples were characterized by X-ray diffraction, specific surface area and porosity analyzer, solid-state ¹³C nuclear magnetic resonance, Fourier transform infrared spectroscopy, and elementalanalyzer. Pyrolysis experiments were carried out in a powder-particle fluidized bed reactor, and the distribution and composition of the pyrolysis products were analyzed. The gasification activity of char was investigated by thermogravimetric analysis with a CO₂ atmosphere. The results show that hydrothermal pretreatment (HTP) can destroy the cross-linking structure of SL lignite, and affect its aromaticity, pore structure, functional group, and carbon structure to change the distribution and composition of pyrolysis products of SL lignite, especially the composition of tar. Finally, the structure-activity relationship between the structure, composition, and pyrolysis characteristics of coal was comprehensively studied.

关键词: Hydrothermal pretreatment, Lignite, Physicochemical structure, Fast pyrolysis

Abstract: The structure and composition of coal determine its fast pyrolysis characteristics, and the study of the relationship between them can play an important role in the efficient and clean utilization of coal. So, in this work, hydrothermal pretreatment was used to artificially change the structure and composition of ShengLi (SL) lignite, which was used to investigate the influence of structural changes on pyrolysis. The physicochemicalstructure and composition of samples were characterized by X-ray diffraction, specific surface area and porosity analyzer, solid-state ¹³C nuclear magnetic resonance, Fourier transform infrared spectroscopy, and elementalanalyzer. Pyrolysis experiments were carried out in a powder-particle fluidized bed reactor, and the distribution and composition of the pyrolysis products were analyzed. The gasification activity of char was investigated by thermogravimetric analysis with a CO₂ atmosphere. The results show that hydrothermal pretreatment (HTP) can destroy the cross-linking structure of SL lignite, and affect its aromaticity, pore structure, functional group, and carbon structure to change the distribution and composition of pyrolysis products of SL lignite, especially the composition of tar. Finally, the structure-activity relationship between the structure, composition, and pyrolysis characteristics of coal was comprehensively studied.

Key words: Hydrothermal pretreatment, Lignite, Physicochemical structure, Fast pyrolysis

Boyang Bai, Luyao Qiang, Suisui Zhang, Zhiwei Peng, Hang Mu, Xiaoxun Ma. The effect of hydrothermal pretreatment on the structure and fast pyrolysis behaviors of ShengLi lignite[J]. 中国化学工程学报, 2021, 35(7): 265-274.

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The effect of hydrothermal pretreatment on the structure and fast pyrolysis behaviors of ShengLi lignite

The effect of hydrothermal pretreatment on the structure and fast pyrolysis behaviors of ShengLi lignite

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