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Combustion of Turkish lignites and olive residue: Experiments and kinetic modelling

机译：土耳其褐煤和橄榄渣的燃烧：实验和动力学模型

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This study investigated the combustion behavior and kinetics of Turkish fuels. Two lignite coals from Tuncbilek and Soma region, and olive residue, were used, all within a size range of 106-125 mm. Experiments were performed in a thermogravimetric analyzer (TGA) coupled with a differential thermal analyzer (DTA), under three different heating rates, namely 15, 20, and 40 degrees C/min. Based on the weight loss (TG) and derivative weight loss (DTG) curves, the characteristic temperatures were determined, three different conversion stages were identified, and a combustibility index was calculated for the major stage of combustion. In addition, combustion kinetics parameters of each fuel were determined using the Coats-Redfern method. Experimental results revealed that all three fuels went through a decomposition stage followed by the combustion stage(s). Tuncbilek and Soma lignite had one major combustion stage at an approximate peak temperature of 500 degrees C, while olive residue had two distinct stages for combustion at peak temperatures of 290 degrees C and 423 degrees C. Burnout temperatures of olive residue were always lower than either of the lignites, and an increase in heating rate from 20 to 40 degrees C/min shifted the burnout to higher temperatures. Combustibility index of lignites was similar at low heating rates, whereas at higher heating rates the combustibility of Tuncbilek was approximately twice that of Soma lignite. Olive residue presented values of combustibility which were at least fivefold those of the lignites. During the major stage of combustion and at 20 degrees C/min, Tuncbilek lignite had the highest apparent activation energy of approximately 100 kJ/mol, while Soma lignite and olive residue had similar apparent activation energies of approximately 40 kJ/mol. Increasing heating rate clearly increased the reactivity, combustibility, and burnout temperatures of all fuel samples. Apparent activation energies decreased with a shift in the heating rate from 20 to 40 degrees C/min, whereas between 15 and 20 degrees C/min the values were approximately constant. (C) 2017 Elsevier Ltd. All rights reserved.
机译：这项研究调查了土耳其燃料的燃烧行为和动力学。使用了来自Tuncbilek和Soma地区的两种褐煤，以及橄榄渣，均在106-125 mm的范围内。实验是在热重分析仪（TGA）和差示热分析仪（DTA）结合下，以三种不同的加热速率（即15、20和40摄氏度/分钟）进行的。根据重量损失（TG）和导数重量损失（DTG）曲线，确定特征温度，确定三个不同的转化阶段，并为燃烧的主要阶段计算可燃性指数。另外，使用Coats-Redfern方法确定每种燃料的燃烧动力学参数。实验结果表明，所有三种燃料都经历了分解阶段，随后是燃烧阶段。 Tuncbilek和Soma褐煤在约500摄氏度的峰值温度下有一个主要燃烧阶段，而橄榄渣在290摄氏度和423摄氏度的峰值温度下有两个不同的燃烧阶段。橄榄渣的燃尽温度始终低于两者之一褐煤的加热和升温速率从20摄氏度/分钟增加到40摄氏度/分钟将燃尽转移到更高的温度。在低加热速率下褐煤的可燃性指标相似，而在较高加热速率下，通比比克的可燃性大约是索马褐煤的可燃性的两倍。橄榄渣的可燃性值至少是褐煤的五倍。在燃烧的主要阶段，在20摄氏度/分钟的温度下，通比比克褐煤的表观活化能最高，约为100 kJ / mol，而索马褐煤和橄榄渣的表观活化能相似，约为40 kJ / mol。提高加热速率明显提高了所有燃料样品的反应性，可燃性和燃尽温度。表观活化能随着加热速率从20到40摄氏度/分钟的变化而降低，而在15到20摄氏度/分钟之间，该值近似恒定。 （C）2017 Elsevier Ltd.保留所有权利。

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