Evolution of oxygen functional groups during lignite pyrolysis process

MIAO Shuwei; FU Peifang; LIU Yang; YUE Fang

doi:10.19666/j.rlfd.201710110

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Evolution of oxygen functional groups during lignite pyrolysis process

更新时间：2025-09-28

- Evolution of oxygen functional groups during lignite pyrolysis process
- Thermal Power Generation Vol. 47, Issue 8, Pages: 16-21(2018)
- 作者机构：
  
  华中科技大学煤燃烧国家重点实验室
- 作者简介：
- 基金信息：
- DOI：10.19666/j.rlfd.201710110
  CLC： TK16
- Published Online：02 August 2018，
  
  Published：2018
- 稿件说明：
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MIAO Shuwei, FU Peifang, LIU Yang, et al. Evolution of oxygen functional groups during lignite pyrolysis process[J]. Thermal power generation, 2018, 47(8): 16-21.
DOI：

MIAO Shuwei, FU Peifang, LIU Yang, et al. Evolution of oxygen functional groups during lignite pyrolysis process[J]. Thermal power generation, 2018, 47(8): 16-21. DOI： 10.19666/j.rlfd.201710110.

摘要

基于热重红外技术(TG-FTIR)对神华褐煤进行热解实验研究

在线检测热解过程中含氧气体的释放规律

并通过傅里叶变换显微红外分析不同温度下煤焦样中含氧官能团的赋存状态和含量变化。将宏观产物信息与微观含氧官能团的变化相结合

推断出含氧官能团在热解过程中的演化以及发生的基团反应

以达到揭示褐煤热解机理的目的。结果表明:热解过程中的含氧气体生成特性可以较好地反映煤中的羟基、羧基、羰基等含氧官能团的演变规律;煤中的含氧官能团具有较高的活性

大部分有机含氧官能团的转化主要发生在500℃以下

在500℃以上除少量的氢键难以去除外

其他含氧官能团均检测不到;500℃以上的含氧气体释放主要来源于煤中的矿物质分解。

Abstract

On the basis of thermogravimetric-Fourier transform infrared spectroscopy(TG-FTIR) technology

the pyrolysis of Shenhua lignite was studied and the release rules of oxygen-containing gas during the pyrolysis process were explored. Meanwhile

the occurrences and content of oxygen functional groups in char were analyzed at different temperatures by Fourier transform infrared spectroscopy. The information of macroscopic product and the change of microscopic oxygen functional groups were combined to deduce the evolution and reaction of oxygen functional groups during the pyrolysis process. Therefore

the pyrolysis mechanism of lignite was revealed. The results showed that the generation features of oxygen-containing gas during the pyrolysis process can reveal the evolution of oxygen functional groups such as hydroxyl groups

carboxyl groups and carbonyl groups. The oxygen functional groups had high activity. In addition

the conversion of most of organic oxygen functional groups occurred below 500 ℃. And above 500 ℃

other oxygen functional groups cannot be detected except a small amount of hydrogen bonds which is difficult to remove. The release of oxygen-containing gas above 500 ℃ was mainly due to the decomposition of minerals in coal.

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