Effect of oxygen deficient conditions on oxidative spontaneous combustion characteristics of raw coal and water-immersed air-dried bituminous coal

IF 7.8 2区环境科学与生态学 Q1 ENGINEERING, CHEMICAL Process Safety and Environmental Protection Pub Date : 2025-02-07 DOI:10.1016/j.psep.2025.106859

Gaoyang Qu , Jun Deng , Shuaijing Ren , Yang Xiao , Caiping Wang , Jinrui Wang , Xiadan Duan , Lexiangqian Zhang

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Abstract

The effects of low-oxygen conditions on the oxidation and spontaneous combustion characteristics of raw coal and water-immersed air-dried bituminous coal was studied. Via analysis, including Fourier Transform InfraRed (FTIR), ThermoGravimetry (TG) and Differential Scanning Calorimetry (DSC), the chemical groups and elemental composition of the coal samples were studied, as well as the impact of oxygen concentration on changes in weight and heat release of the coal samples. The water immersed coal sample ignites at a lower temperature compared to the raw sample. The water immersed coal sample undergoes spontaneous combustion at a relatively fast rate, requiring a lower temperature for complete reaction, but it releases less heat after combustion compared to the raw coal sample. In an oxygen-deficient environment, the overall exothermic oxidation process of coal exhibits a lag, with the lag effect becoming more pronounced as the oxygen deficiency intensifies, especially noticeable in high-temperature stages. The impact of water immersion and air drying on the spontaneous combustion of coal is lower compared to the influence of oxygen concentration on coal.

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缺氧条件对原煤和水浸风干烟煤氧化自燃特性的影响

研究了低氧条件对原煤和水浸式风干烟煤氧化和自燃特性的影响。通过红外傅立叶变换（FTIR）、热重（TG）、差示扫描量热（DSC）等分析，研究了煤样的化学基团和元素组成，以及氧浓度对煤样重量变化和放热的影响。与原始样品相比，水浸煤样品在较低的温度下点燃。水浸煤样自燃速度较快，反应完全所需温度较低，但燃烧后放出的热量较原煤样少。在缺氧环境下，煤的整体放热氧化过程表现出滞后性，随着缺氧程度的加剧，滞后性更加明显，在高温阶段尤为明显。与氧浓度对煤自燃的影响相比，浸水和风干对煤自燃的影响较小。

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来源期刊

Process Safety and Environmental Protection 环境科学-工程：化工

CiteScore

11.40

自引率

15.40%

发文量

929

审稿时长

8.0 months

期刊介绍： The Process Safety and Environmental Protection (PSEP) journal is a leading international publication that focuses on the publication of high-quality, original research papers in the field of engineering, specifically those related to the safety of industrial processes and environmental protection. The journal encourages submissions that present new developments in safety and environmental aspects, particularly those that show how research findings can be applied in process engineering design and practice. PSEP is particularly interested in research that brings fresh perspectives to established engineering principles, identifies unsolved problems, or suggests directions for future research. The journal also values contributions that push the boundaries of traditional engineering and welcomes multidisciplinary papers. PSEP's articles are abstracted and indexed by a range of databases and services, which helps to ensure that the journal's research is accessible and recognized in the academic and professional communities. These databases include ANTE, Chemical Abstracts, Chemical Hazards in Industry, Current Contents, Elsevier Engineering Information database, Pascal Francis, Web of Science, Scopus, Engineering Information Database EnCompass LIT (Elsevier), and INSPEC. This wide coverage facilitates the dissemination of the journal's content to a global audience interested in process safety and environmental engineering.