Experimental study and thermodynamic analysis of coal spontaneous combustion characteristics

IF 1.9 4区工程技术 Q4 ENERGY & FUELS

Combustion Theory and Modelling Pub Date : 2022-12-09 DOI:10.1080/13647830.2022.2153742

Minbo Zhang, Zichao Wang, Longkang Wang, Zhen Zhang, Dangyu Zhang, Chunxin Li

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引用次数: 6

Abstract

Spontaneous coal combustion is one of the most common disasters in coal mine production. In order to explore the mechanism of coal spontaneous combustion more deeply, coal samples from the Yangdong wellfield of Jizhong Energy were selected for oxidative heat energy analysis experiments. A temperature-programmed experiment was selected to study the changes in characteristic parameters during the low-temperature oxidation of coal under different air supply conditions. TG-DSC experiments were conducted to study the characteristic temperature changes and thermodynamic characteristics of coal combustion processes at different heating rates. The study results show that the coal is most easily oxidised in the low-temperature oxidation stage when the air supply is 120 ml/min. The oxygen consumption rate, CO generation rate, and maximum and minimum heat release intensity are all greater at this airflow than under other conditions. The process of spontaneous combustion of coal has six characteristic temperature points and is divided into five stages. The characteristic temperature of the coal sample increased with the increase of the heating rate, and the TG/DTG curve showed a hysteresis phenomenon. DSC temperature curve shifts toward the high temperature with the increase of the heating rate, and the exothermic region is expanded. Isokinetic analysis (F-W-O and V-W) and Coats-Redfern model for calculating thermodynamic parameters. The activation energy of the samples decreased with the increase of the heating rate in the range of 2∼20°C·min−1 and showed a decreasing trend with the increase of the conversion rate.

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煤自燃特性的实验研究与热力学分析

自燃是煤矿生产中最常见的灾害之一。为了更深入地探讨煤的自燃机理，选取冀中能源杨东井田煤样进行氧化热能分析实验。采用程序升温实验研究了不同供气条件下煤低温氧化过程中特征参数的变化。通过TG-DSC实验研究了不同升温速率下煤燃烧过程的特征温度变化和热力学特性。研究结果表明，当供气量为120时，煤在低温氧化阶段最容易被氧化 ml/分钟。在这种气流下，氧气消耗率、CO生成率以及最大和最小热释放强度都比在其他条件下更大。煤的自燃过程有六个特征温度点，分为五个阶段。煤样的特征温度随着加热速率的增加而增加，TG/DTG曲线呈现滞后现象。DSC温度曲线随着加热速率的增加而向高温方向移动，放热区域扩大。等速分析（F-W-O和V-W）和用于计算热力学参数的Coats-Redfern模型。在2～20°C·min−1的范围内，样品的活化能随着加热速率的增加而降低，并随着转化率的增加呈下降趋势。

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来源期刊

Combustion Theory and Modelling 工程技术-工程：化工

CiteScore

3.00

自引率

7.70%

发文量

审稿时长

6 months

期刊介绍： Combustion Theory and Modelling is a leading international journal devoted to the application of mathematical modelling, numerical simulation and experimental techniques to the study of combustion. Articles can cover a wide range of topics, such as: premixed laminar flames, laminar diffusion flames, turbulent combustion, fires, chemical kinetics, pollutant formation, microgravity, materials synthesis, chemical vapour deposition, catalysis, droplet and spray combustion, detonation dynamics, thermal explosions, ignition, energetic materials and propellants, burners and engine combustion. A diverse spectrum of mathematical methods may also be used, including large scale numerical simulation, hybrid computational schemes, front tracking, adaptive mesh refinement, optimized parallel computation, asymptotic methods and singular perturbation techniques, bifurcation theory, optimization methods, dynamical systems theory, cellular automata and discrete methods and probabilistic and statistical methods. Experimental studies that employ intrusive or nonintrusive diagnostics and are published in the Journal should be closely related to theoretical issues, by highlighting fundamental theoretical questions or by providing a sound basis for comparison with theory.