Experiments on Combustion Thermodynamics and Kinetics for Different Coal Ranks

IF 0.8 4区 工程技术 Q4 CHEMISTRY, MULTIDISCIPLINARY
Genyin Cheng, Ruoting Fan, Junhong Si
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Abstract

To investigate combustion thermodynamics and kinetics for different coal rank, TG-DSC test was conducted on long-flame coal (LFC), gas-fed coal (GFC), and coke coal (CC) under different heating rates. Based on the DSC curve, the combustion process of coal can be divided into five stages: dehydration and desorption stage, chemical adsorption stage, transition stage, combustion stage, and burnout stage. With the increase in heating rate, the combustion characteristic parameters and the exothermic quantity show an upward trend. Under the consistent condition of the heating rate, the coal rank is positively correlated with its characteristic temperature, and negatively correlated with the maximum exothermic quantity. The kinetics experimental results show that the differential method exhibited higher fitting coefficients compared to the integral method, indicating its greater reliability in calculating results. Moreover, the activation energy increased with the increase of the coal rank under the same heating rate. CC has the highest activation energy, followed by GFC and LFC. These findings provide data support for the combustion law of similar coal types.

Abstract Image

不同等级煤的燃烧热力学和动力学实验
为了研究不同等级煤的燃烧热力学和动力学,在不同加热速率下对长焰煤(LFC)、给气煤(GFC)和焦煤(CC)进行了 TG-DSC 试验。根据 DSC 曲线,煤的燃烧过程可分为五个阶段:脱水解吸阶段、化学吸附阶段、过渡阶段、燃烧阶段和燃尽阶段。随着加热速率的增加,燃烧特性参数和放热量呈上升趋势。在加热速率一致的条件下,煤的等级与其特征温度呈正相关,与最大放热量呈负相关。动力学实验结果表明,与积分法相比,微分法的拟合系数更高,表明其计算结果更可靠。此外,在相同的加热速率下,活化能随煤炭等级的增加而增加。CC 的活化能最高,其次是 GFC 和 LFC。这些发现为类似煤种的燃烧规律提供了数据支持。
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来源期刊
Solid Fuel Chemistry
Solid Fuel Chemistry CHEMISTRY, MULTIDISCIPLINARY-ENERGY & FUELS
CiteScore
1.10
自引率
28.60%
发文量
52
审稿时长
6-12 weeks
期刊介绍: The journal publishes theoretical and applied articles on the chemistry and physics of solid fuels and carbonaceous materials. It addresses the composition, structure, and properties of solid fuels. The aim of the published articles is to demonstrate how novel discoveries, developments, and theories may be used in improved analysis and design of new types of fuels, chemicals, and by-products. The journal is particularly concerned with technological aspects of various chemical conversion processes and includes papers related to geochemistry, petrology and systematization of fossil fuels, their beneficiation and preparation for processing, the processes themselves, and the ultimate recovery of the liquid or gaseous end products.
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