Pyrolysis characteristics and kinetics analysis of Qinghua coal, Ningxia based on chemical bonding characteristics of macerals

MAO Ning; WANG Qiang; YANG Yan; XU Dunxin; FENG Wei; ZHANG Jinpeng; BAI Hongcun; GUO Qingjie

doi:10.11949/0438-1157.20191156

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Pyrolysis characteristics and kinetics analysis of Qinghua coal, Ningxia based on chemical bonding characteristics of macerals

Energy and environmental engineering | 更新时间：2026-07-24

- Pyrolysis characteristics and kinetics analysis of Qinghua coal, Ningxia based on chemical bonding characteristics of macerals
- CIESC Journal Vol. 71, Issue 2, Pages: 811-820(2020)
- 作者机构：
  
  1. 宁夏大学省部共建煤炭高效利用与绿色化工国家重点实验室，化学化工学院，宁夏银川 750021
  2. 宁夏庆华煤化集团有限公司，宁夏吴忠 751100
- 作者简介：
- 基金信息：
- DOI：10.11949/0438-1157.20191156
  CLC： TQ 530.2
- Received：10 October 2019，
  
  Revised：2019-11-08，
  
  Online First：14 August 2020，
  
  Published：05 February 2020
- 稿件说明：
移动端阅览
毛宁, 王强, 杨妍, 徐敦信, 冯炜, 张金鹏, 白红存, 郭庆杰. 基于显微组分化学键特征的宁夏庆华煤热解特性及动力学分析[J]. 化工学报, 2020, 71(2): 811-820

MAO Ning, WANG Qiang, YANG Yan, XU Dunxin, FENG Wei, ZHANG Jinpeng, BAI Hongcun, GUO Qingjie. Pyrolysis characteristics and kinetics analysis of Qinghua coal, Ningxia based on chemical bonding characteristics of macerals[J]. CIESC Journal, 2020, 71(2): 811-820
毛宁, 王强, 杨妍, 徐敦信, 冯炜, 张金鹏, 白红存, 郭庆杰. 基于显微组分化学键特征的宁夏庆华煤热解特性及动力学分析[J]. 化工学报, 2020, 71(2): 811-820 DOI： 10.11949/0438-1157.20191156.

MAO Ning, WANG Qiang, YANG Yan, XU Dunxin, FENG Wei, ZHANG Jinpeng, BAI Hongcun, GUO Qingjie. Pyrolysis characteristics and kinetics analysis of Qinghua coal, Ningxia based on chemical bonding characteristics of macerals[J]. CIESC Journal, 2020, 71(2): 811-820 DOI： 10.11949/0438-1157.20191156.

摘要

通过X射线光电子能谱和傅里叶红外光谱表征宁夏宁东庆华煤不同显微组分的官能团种类、表面结构元素价态分布及化学键赋存特征。采用热重-质谱联用考察庆华煤镜质组和惰质组在不同热解温度下的失重行为和关键气体组分变化。进一步基于Coats-Redfern模型从化学键断裂特征和反应动力学角度探讨煤镜质组和惰质组的热解行为差异。结果表明，庆华煤显微组分的热解失重峰与相应化学键断裂信息能够很好地吻合。不同显微组分的热重曲线变化趋同，但相同热解温度下镜质组的失重率始终高于惰质组。快速热解阶段镜质组较惰质组表现出更大的失重率和最大失重速率。其主要原因在于镜质组的脂肪族官能团相对含量更高，快速热解阶段会发生更多的C

—C

断裂。不同热解温度下庆华煤显微组分三个主要热解阶段的活化能和频率因子大小次序为：

快速热解阶段

快速缩合阶段

缓慢热解阶段。在快速热解阶段，镜质组和惰质组的平均活化能均约为75 kJ/mol，但镜质组的频率因子更高。

Abstract

X-Ray photoelectron spectroscopy and Fourier transform infrared spectroscopy were used to characterize the functional group types

surface structure element valence distribution and chemical bond occurrence characteristics of Ningxia Ningdong Qinghua coal. Then the mass loss behavior of vitrinite and inertinite of Qinghua coal at different pyrolysis temperatures and the changes of key gas components were investigated by means of the thermogravimetry coupled with mass spectrometry (TG-MS). Furthermore

the differences of pyrolysis behavior between vitrinite and inertinite were discussed from the point of view of chemical bonding breaking and pyrolysis kinetics based on Coats-Redfern model. The results show that the pyrolysis weightlessness peaks of Qinghua coal macerals at different temperatures are in good agreement with the information of corresponding chemical bond breaking. The TG curves of different macerals of Qinghua coal are similar

but the mass loss rate of vitrinite is always higher than that of inertinite at the same pyrolysis temperature. In the fast pyrolysis stage

vitrinite exhibits greater mass loss rate and also maximum mass loss rate than inertinite. The main reason is that the relative content of aliphatic functional groups in vitrinite is higher

and more C

—C

bonds would break down during the fast pyrolysis stage. The order of activation energy and frequency factor of three main pyrolysis stages of Qinghua coal macerals at different pyrolysis temperatures is: fast pyrolysis stage

fast polycondensation stage

slow pyrolysis stage. In the fast pyrolysis stage

the average activation energies of vitrinite and inertinite are both about 75 kJ/mol

but the frequency factor of vitrinite is higher.

关键词

Keywords

references

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