Study on the mechanism of mineral effects on coal oxidation and combustion properties in the Dongsheng Coalfield

IF 6.6 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2026-04-01 Epub Date: 2026-02-26 DOI:10.1016/j.csite.2026.107867

Fengwei Dai , Haotian Yang , Ge Huang , Xun Zhang , Gang Bai

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Abstract

To elucidate the mechanism by which minerals influence coal spontaneous combustion, coal samples from the Fourth Mining Area of the Dongsheng Coalfield were subjected to acid-base delignification to remove minerals and characterize their types and contents. Combined with in-situ infrared spectroscopy, thermogravimetric-mass spectrometry (TG-MS), and programmed temperature-gas chromatography techniques, systematically analyzing the evolution of functional groups, oxygen consumption characteristics, gas products, and differences in combustion behavior before and after mineral removal. Experimental results indicate that the initial temperature for alkane oxidation in ash-removed coal samples increased by 30-70 °C, confirming that minerals significantly catalyze low-temperature alkane oxidation. Mineral component correlation analysis indicates that albite, gypsum, and calcite are key catalytic minerals. During the high-temperature combustion stage, the influence of minerals on combustion behavior exhibited distinct differences among coal samples: After ash removal treatment, the ignition temperature of GJL and LJH coal increased by 58 °C and 42 °C, respectively, while the maximum weight loss rate decreased by 54 % and 15 %. In contrast, the combustion characteristics of HQL and MKQ coal showed minimal changes after ash removal treatment, with MKQ coal exhibiting a slight decrease in ignition temperature. Based on XRF and mineral composition analysis, it is inferred that magnesium doping is a key factor influencing the combustion behavior of carbon skeletons, and its catalytic effect is closely related to the type of support: magnesium-doped materials supported on kaolinite/perlite exhibit significantly stronger catalytic activity than those supported on quartz. This study elucidates the role of key minerals and their occurrence forms in the coal spontaneous combustion process through the correlation between mineral composition, oxidation pathways, and combustion behavior. It lays a crucial experimental and theoretical foundation for deepening the understanding of coal spontaneous combustion mechanisms and advancing prevention and control technologies.

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东胜煤田矿物对煤氧化及燃烧特性影响机理研究

为阐明矿物对煤自燃的影响机理，对东胜煤田四采区的煤样进行了酸碱脱木质素处理，去除矿物，并对其类型和含量进行了表征。结合原位红外光谱、热重质谱（TG-MS）和程控温度-气相色谱技术，系统分析了矿物去除前后官能团的演变、耗氧量特征、气体产物和燃烧行为的差异。实验结果表明，脱灰煤中烷烃氧化起始温度提高了30 ~ 70℃，证实了矿物对烷烃低温氧化的催化作用显著。矿物成分对比分析表明，钠长石、石膏和方解石是主要的催化矿物。在高温燃烧阶段，矿物对煤样燃烧行为的影响表现出明显的差异：除灰处理后，GJL和LJH煤的着火温度分别提高了58℃和42℃，最大失重率分别下降了54%和15%。相比之下，HQL和MKQ煤的燃烧特性在除灰处理后变化不大，MKQ煤的着火温度略有下降。通过XRF和矿物成分分析可知，镁掺杂是影响碳骨架燃烧行为的关键因素，其催化效果与载体类型密切相关：高岭石/珍珠岩上负载的掺镁材料的催化活性明显强于石英上负载的掺镁材料。本研究通过矿物组成、氧化途径和燃烧行为之间的相关性，阐明了关键矿物及其赋存形态在煤自燃过程中的作用。为深化对煤自燃机理的认识，推进防治技术的发展，奠定了至关重要的实验和理论基础。

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来源期刊

Case Studies in Thermal Engineering Chemical Engineering-Fluid Flow and Transfer Processes

CiteScore

8.60

自引率

11.80%

发文量

812

审稿时长

76 days

期刊介绍： Case Studies in Thermal Engineering provides a forum for the rapid publication of short, structured Case Studies in Thermal Engineering and related Short Communications. It provides an essential compendium of case studies for researchers and practitioners in the field of thermal engineering and others who are interested in aspects of thermal engineering cases that could affect other engineering processes. The journal not only publishes new and novel case studies, but also provides a forum for the publication of high quality descriptions of classic thermal engineering problems. The scope of the journal includes case studies of thermal engineering problems in components, devices and systems using existing experimental and numerical techniques in the areas of mechanical, aerospace, chemical, medical, thermal management for electronics, heat exchangers, regeneration, solar thermal energy, thermal storage, building energy conservation, and power generation. Case studies of thermal problems in other areas will also be considered.