ABSTRACT

This study investigated the pyrolysis properties and kinetic behavior of Ermenek (Konya, Turkey) lignite. For this purpose, lignite was carbonized at 500°C and different heating rates (5, 10, 15, and 20°C/min). Proximate, elemental, XRF, and TGA-DTA lignite and chars were performed. Thermal analyses were performed at a heating rate of 10°C/min from room temperature to 1000°C and an inert (N₂) gas flow of 50 ml/min. Peak temperatures and mass losses were determined from the data obtained from the experiments. By examining the thermogram curves, three different temperature regions depended on moisture loss, the release of volatile matter, and fixed carbon combustion. In addition, from these data, kinetic calculations were performed using Arrhenius and Coats-Redfern approaches, and the apparent activation energies were calculated for each region. The activation energy values calculated according to the Coats-Redfern kinetic model are significantly lower than those calculated according to the Arrhenius kinetic model. The highest activation energies calculated were: for Region 1 and Region 2 at 5°C/min heating rate and for Region 3 at 10°C/min heating rate.

摘要

本研究研究了 Ermenek（土耳其科尼亚）褐煤的热解特性和动力学行为。为此，褐煤在 500°C 和不同的加热速率（5、10、15 和 20°C/min）下进行碳化。对褐煤和炭进行了近似分析、元素分析、XRF 分析和 TGA-DTA 分析。热分析以 10°C/min 的加热速率从室温至 1000°C 并在惰性气体 (N ₂）气体流量为 50 毫升/分钟。根据实验获得的数据确定峰值温度和质量损失。通过检查热分析图曲线，三个不同的温度区域取决于水分损失、挥发性物质的释放和固定碳燃烧。此外，根据这些数据，使用阿伦尼乌斯和 Coats-Redfern 方法进行动力学计算，并计算每个区域的表观活化能。根据Coats-Redfern动力学模型计算的活化能值明显低于根据Arrhenius动力学模型计算的活化能值。计算出的最高活化能是：区域 1 和区域 2 的加热速率为 5°C/min，区域 3 的加热速率为 10°C/min。