Study on the characteristics of secondary oxidation and the key reactive groups of fire area coal by different cooling rates

IF 6.4 2区工程技术 Q1 THERMODYNAMICS

Case Studies in Thermal Engineering Pub Date : 2025-03-11 DOI:10.1016/j.csite.2025.106014

Xun Zhang , Ronghai Sun , Bing Lu , Ge Huang , Ling Qiao , Huimin Liang

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引用次数: 0

Abstract

In order to reveal the effects of different cooling rates (slow and rapid) on the secondary oxidation characteristics of coal in coalfield fire area (primary heating to 180 °C). Simultaneous thermal analysis (TG-DSC), programmed heating and in situ Fourier transform infrared (FTIR) experiments were used. Thermodynamic analysis as well as Pearson and grey correlation analyses were used to analyze the low-temperature oxidation processes in raw coal and in coal from the fire area that underwent different cooling rates. The results showed that there was a significant difference of coal. The maximum cumulative heat release of raw coal was 35.942 J. The slow cooling (SC) and rapid cooling (RC) coals were only 17.188 and 23.761 J. At 200 °C, the CO production of the raw coal was 8432 ppm, and the SC and RC coals were 521 and 1166 ppm higher than it, respectively. In the correlation analysis, it was found that the key reactive groups in SC coal were -CH₂ and -COOH, whereas in RC coal it was -CH₂. There are two fundamental reasons for the difference: (1) SC coal accumulated more -COOH groups. (2) The -CH₂ groups of RC coal are more easily oxidized than those of SC coal.

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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.