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Kinetic and thermodynamic analyses of dried oily sludge pyrolysis
Journal of the Energy Institute ( IF 5.6 ) Pub Date : 2020-12-24 , DOI: 10.1016/j.joei.2020.12.002
Imtiaz Ali , Rumaisa Tariq , Salman Raza Naqvi , Asif Hussain Khoja , Muhammad Taqi Mehran , Muhammad Naqvi , Ningbo Gao

Oily sludge has the potential to utilize in pyrolysis process effectively because of higher product recovery and lower harmful emissions. Due to the complex nature of reactions, it is necessary to evaluate the thermo-kinetic behavior of the process to make it commercially feasible. This study includes thermal degradation behavior, the kinetic and thermodynamic analysis of dry oily sludge by applying Friedman and Vyazovkin method (model-free approach), and Coats-Redfern method (model-fitting approach) with the help of thermogravimetric analysis TGA at different heating rates (5, 20, 40 °C/min). The active region was from 20 to 60% conversion range because the maximum conversion occurs in this region. The overall activation energy decreases as the conversion increases from a lower range (60%) to a higher range (80%) for all satisfied models. The estimated range of pre-exponential coefficient for each model was to 4.91E+15 to 2.30E-01min−1 in the conversion range of 20–60% and 9.80E+02 to 4.89E-04min−1 in the conversion range 60–80%. The overall value of the change in enthalpy ΔH and change in Gibbs free energy ΔG decrease as the conversion increases from the lower range to the higher range.



中文翻译:

干燥油性污泥热解的动力学和热力学分析

由于更高的产品回收率和更低的有害排放量,含油污泥具有在热解过程中有效利用的潜力。由于反应的复杂性质,有必要评估该方法的热动力学行为以使其在商业上可行。这项研究包括热降解行为,通过使用Friedman和Vyazovkin方法(无模型方法)和利用Coats-Redfern方法(模型拟合方法)在不同加热条件下进行热重分析TGA来干燥油性污泥的动力学和热力学分析。速率(5、20、40°C / min)。有源区域的转换范围为20%到60%,因为最大转换发生在该区域。对于所有满意的模型,总的活化能随着转化率从较低范围(60%)增大到较高范围(80%)而降低。-1中的20-60%和9.80E + 02至4.89E-04min转换范围-1在转换范围60-80%。焓变ΔH和吉布斯自由能变化ΔG的总值随着转化率从较低范围到较高范围的增加而减小。

更新日期:2021-01-02
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