低阶煤羰基结构对其低温热解过程的影响

doi:10.10685/j.issn.1000-6613.2017-2433

化工进展 ›› 2018, Vol. 37 ›› Issue (11): 4257-4264.DOI: 10.10685/j.issn.1000-6613.2017-2433

低阶煤羰基结构对其低温热解过程的影响

刘涛, 王洪超, 常国璋, 郭庆杰

青科技大学化工学院, 清洁化工过程山东省高校重点实验室, 山东青岛 266042

收稿日期:2017-11-24 修回日期:2017-12-25 出版日期:2018-11-05 发布日期:2018-11-05
通讯作者: 郭庆杰,教授。E-mail:qj_guo@yahoo.com。
作者简介:刘涛(1989-),男,博士研究生。
基金资助:
山东省重点研发计划（2016GSF117005）及山东省自然基金重点项目（ZR2015QZ02）。

Influence of carbonyl containing groups on the low-temperature pyrolysis of low-rank coal

LIU Tao, WANG Hongchao, CHANG Guozhang, GUO Qingjie

Key Laboratory of Clean Chemical Processing of Shandong Province, College of Chemical Engineering, Qingdao University of Science & Technology, Qingdao 266042, Shandong, China

Received:2017-11-24 Revised:2017-12-25 Online:2018-11-05 Published:2018-11-05

摘要/Abstract

摘要： 为探究含羰基官能团（CCP）含量和结构对低阶煤（LRC）低温热解过程的影响，本文利用¹³C NMR对4种元素组成相似的LRC结构进行了表征，并利用TG-FTIR和固定床热解反应装置研究了CCP结构对其低温热解过程的影响。研究结果表明，4种LRC元素组成和主要骨架结构类似，CCP结构存在较大差异，芳香结构中CCP摩尔分数大小顺序为BS > BT > ER > QJ，而脂肪结构中CCP含量与之相反。CCP结构和含量对LRC的低温热解过程有着明显的影响，TG-FTIR实验表明，LRC中脂肪结构CCP能够显著促进低温区（30～350℃）CO₂的生成，且含量越高在低温区失重量越大；而芳香结构CCP则促进了高温区（350～550℃）小分子芳烃和脂肪烃的生成，且含量越高，LRC在高温区失重速率越大。低温热解实验证明，热解焦油产率和酚类物质含量与LRC中芳香结构CCP含量呈正相关，与脂肪结构CCP含量呈负相关关系。

关键词: 低阶煤, 含羰基官能团, 低温热解, 脂肪结构, 芳香结构

Abstract: In order to explore the influence of carbonyl containing groups (CCPs) on the low-temperature pyrolysis process of low-rank coal, the content/structure of CCPs and other chemical structures for four kinds of low-rank coals (LRC) which had similar elementary composition were characterized by ¹³C NMR. The influence of CCPs on the LRCs' low-temperature pyrolysis process was investigated in a TGA and a fixed-bed pyrolysis reactor. The results showed that the four LRCs had similar elementary composition and the main frame structure. However, there were big differences in the content and structure of carbonyl containing groups. The mole percent order of CCPs in aromatic structure of the four LRC was BS > BT > ER > QJ, while that in aliphatic structure was just in the reverse order. The results of TG-FTIR showed that CCPs in aliphatic structure resulted in the weight loss in low-temperature stage (30-350℃). A mount of CO₂ was produced at the same time. The CCPs in aromatic structure promoted the generation of small molecule aromatic and aliphatic hydrocarbons and the weight loss in high-temperature stage (350-550℃). The results of low-temperature pyrolysis experiments showed that there was a positive correlation between the tar/phenolic yield and the CCPs content in aromatic structure.

Key words: low-rank coal, carbonyl containing group, low-temperature pyrolysis, aliphatic structure, aromatic structure

中图分类号:

TQ546.1

刘涛, 王洪超, 常国璋, 郭庆杰. 低阶煤羰基结构对其低温热解过程的影响[J]. 化工进展, 2018, 37(11): 4257-4264.

LIU Tao, WANG Hongchao, CHANG Guozhang, GUO Qingjie. Influence of carbonyl containing groups on the low-temperature pyrolysis of low-rank coal[J]. Chemical Industry and Engineering Progress, 2018, 37(11): 4257-4264.

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低阶煤羰基结构对其低温热解过程的影响

Influence of carbonyl containing groups on the low-temperature pyrolysis of low-rank coal

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