Free radical in situ analysis and change of spontaneous combustion characteristics after pre-oxidation for thermal upgraded lignite

LIU Lihua; CHU Mo; DANG Tongtong; CHANG Zhibing; QU Yang

doi:10.11949/j.issn.0438-1157.20170532

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Free radical in situ analysis and change of spontaneous combustion characteristics after pre-oxidation for thermal upgraded lignite

更新时间：2025-12-10

- Free radical in situ analysis and change of spontaneous combustion characteristics after pre-oxidation for thermal upgraded lignite
- CIESC Journal Issue 10, Pages: 3967-3977(2017)
- 作者机构：
  
  1. 河南城建学院材料与化工学院,河南,平顶山,467000
  2. 中国矿业大学(北京)化学与环境工程学院,北京,100083
- 作者简介：
- 基金信息：
- DOI：10.11949/j.issn.0438-1157.20170532
  CLC： Q536
- Online First：05 October 2017，
  
  Published：05 October 2017
- 稿件说明：
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LIU Lihua, CHU Mo, DANG Tongtong, et al. Free radical in situ analysis and change of spontaneous combustion characteristics after pre-oxidation for thermal upgraded lignite[J]. CIESC Journal, 2017, (10): 3967-3977.
DOI：

LIU Lihua, CHU Mo, DANG Tongtong, et al. Free radical in situ analysis and change of spontaneous combustion characteristics after pre-oxidation for thermal upgraded lignite[J]. CIESC Journal, 2017, (10): 3967-3977. DOI： 10.11949/j.issn.0438-1157.20170532.

摘要

针对不同温度热提质褐煤新鲜样及其自然环境中储存一定时间后的预氧化样，利用订制的自燃测定实验装置测得各样品的自燃倾向性差异，采用X-band电子自旋共振波谱仪进行自由基动态原位分析，研究预氧化对热提质褐煤自燃特性的影响。结果表明，热提质温度升高，新鲜样的自燃倾向性降低。但随着储存时间延长，105~500℃热提质褐煤发生预氧化，自燃倾向性不同程度地增加，400℃热提质后的预氧化样与原煤一样易自燃。在自燃氧化过程中，与新鲜样不同，预氧化样的吸氧量增加，自由基浓度也增加。预氧化不仅使热提质褐煤自由基增加；且在自燃的加速氧化阶段后期，不断产生自由基，维持氧化自热升温。而400℃热提质褐煤新鲜样在自燃氧化初期消耗大量小分子自由基，损失达80%，因不能持续产生活性自由基难以维持自燃氧化反应进行。

Abstract

The difference of spontaneous combustion liability of fresh samples (SA) and pre-oxidation samples (SB) of lignite upgraded at different temperature

were tested by the experiment equipment of temperature programming.Free radicals in situ were dynamically analyzed by X-band electron spin resonance spectroscopy (ESR) and the effect of pre-oxidation on spontaneous combustion liability was surveyed.The results showed that the spontaneous combustion liability of SA reduced with rising upgrading temperature.With the storage time extension in natural environment

lignite upgraded at 105-500℃ was effected by pre-oxidation.The spontaneous combustion liability increased in varying degrees

and lignite upgraded at 400℃ became easy to spontaneous combustion as well as raw lignite.During the oxidation process of spontaneous combustion

being different from fresh samples

the free radical concentration for pre-oxidation samples increased with increasing adsorbed oxygen amount.Pre-oxidation not only improved the free radical amount of upgraded lignite

but also made the continuous generation of new free radical and kept the self-heating and temperature rising in the later part of accelerating oxidation phase.But micromolecule free radicals were rapidly consumed and loss 80% for the fresh sample upgraded at 400℃

which made it could not provide new free radicals and maintain oxidation reaction.

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