Investigating combustion kinetics and combustion behavior of low-grade Pakistani coal: isothermal and non-isothermal analyses using thermogravimetric analysis (TGA)

IF 2.2 4区 化学 Q2 Engineering
Mansoor Ahmed Lakhmir, Imran Nazir Unar, Abdul Rehman Jatoi, Jawad Ahmed, Faheem Akhter
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Abstract

Herein, the combustion kinetics of low-grade coal through isothermal and non-isothermal analysis was investigated using thermogravimetric analysis in both N2 and O2 atmospheres. In the non-isothermal method, ignition temperature decreased from (236.45–202.11 °C) and burnout temperature (283.12–281.21 °C) was determined. The low-grade coal samples that underwent kinetic studies were initially treated with alkali and acid treatments. Experimental data were analyzed using the shrinking core model (SCM) and volume model (VM) using the isothermal method. As per results, the combustion curve shifted to higher temperature zones (600 °C, 700 °C, 800 °C, and 900 °C), resulting in an increased peak combustion rate. Higher combustion temperatures corresponded to elevated combustion rates and reduced total combustion times, indicating an improved coal combustion process. Among the models considered, the SCM emerged as the preferred choice for establishing conversion–time relationships and estimating reaction rate constants (k) across a spectrum of temperatures. Predictions based on apparent activation energy (E) and pre-exponential factor (A) were made using the Arrhenius equation. The apparent activation energy for isothermal combustion before and after chemical treatment using SCM (161.57–131.26 kJ/mol) and VM (179.67–138.52 kJ/mol) was determined. This study contributes valuable insights into the intricate dynamics of low-grade coal combustion, particularly emphasizing the significance of temperature variations on combustion characteristics.

在此,利用热重分析法,通过等温和非等温分析,研究了低品位煤在 N2 和 O2 大气中的燃烧动力学。在非等温方法中,着火温度从(236.45-202.11 ℃)下降,燃尽温度(283.12-281.21 ℃)被测定。进行动力学研究的低品位煤样最初经过碱处理和酸处理。实验数据采用收缩核心模型(SCM)和等温法体积模型(VM)进行分析。结果显示,燃烧曲线向高温区(600 ℃、700 ℃、800 ℃ 和 900 ℃)移动,导致峰值燃烧速率增加。燃烧温度越高,燃烧率越高,总燃烧时间越短,表明煤的燃烧过程得到了改善。在所考虑的各种模型中,单片机是建立转化时间关系和估算各种温度下反应速率常数 (k) 的首选。根据表观活化能(E)和预指数(A),使用阿伦尼乌斯方程进行了预测。确定了使用单片机(161.57-131.26 kJ/mol)和 VM(179.67-138.52 kJ/mol)进行化学处理前后的等温燃烧表观活化能。这项研究有助于深入了解低品位煤燃烧的复杂动态,特别是强调温度变化对燃烧特性的重要影响。
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来源期刊
Chemical Papers
Chemical Papers Chemical Engineering-General Chemical Engineering
CiteScore
3.30
自引率
4.50%
发文量
590
期刊介绍: Chemical Papers is a peer-reviewed, international journal devoted to basic and applied chemical research. It has a broad scope covering the chemical sciences, but favors interdisciplinary research and studies that bring chemistry together with other disciplines.
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