Low temperature pyrolysates distribution and kinetics of Zhaotong lignite

Low temperature pyrolysates distribution and kinetics of Zhaotong lignite
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昭通褐煤低温热解产物分布及动力学

DOI:
10.1016/j.enconman.2016.02.004
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发表时间:
2016-04
影响因子:
10.4
通讯作者:
Guo Yunfei
Guo Yunfei
中科院分区:
工程技术1区
文献类型:
--
作者:
Xu Ying;Zhang Yongfa;Zhang Guojie;Guo Yunfei

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研究了昭通褐煤低温热解过程中各产物的分布规律,并建立了相应的动力学模型。使用不含载气的固定床反应器系统。对于产物(焦油、气体和半焦)分布的测定,在不同的操作因素下进行了实验。采用气相色谱(GC)、气相色谱/质谱联用(GC/MSD)、傅里叶变换红外光谱(FTIR)、氮气吸附-脱附等温线分析和扫描电镜(SEM)等分析手段对热解产物进行了表征。以Coats-Redfern动力学模型为基础,预测了实验结果。可以看出,温度、加热速率和颗粒尺寸在低温热解物分布中起着关键作用。同时,发现H/C和O/C原子比与产物产率有一定的相关性。用实验馏分对Costs-Redfern积分模型的预测结果进行了讨论,表明该模型能够较好地解释褐煤低温热解反应机理。
This paper aims to determine the distribution of all species produced from Zhaotong lignite under low temperature pyrolysis and to derive an appropriate kinetic model. A fixed bed reactor system with no carrier gas is used. For the products (tar, gas and semi-char) distribution determination, experiments are carried out over different operating factors. The characteristics of pyrolysates are analyzed with Gas Chromatograph (GC), Gas Chromatograph/Mass Selective Detector system (GC/MSD), Fourier transform infrared spectroscopy (FTIR), nitrogen adsorption–desorption isotherm analysis and Scanning Electron Microscope (SEM). The kinetic model of Coats–Redfern is used, as a basis, to predict the experimental evolution curves. It is seen here that temperature, heating rate and particle size play a pivotal role in low temperature pyrolysates distribution. Meanwhile, it is suggested that atomic ratios of H/C and O/C have some correlativity with the yield of products. The prediction of Costs–Redfern integral model is discussed with the experimental fractions, which indicates that the model is suitable to explain the reaction mechanism of lignite during low temperature pyrolysis.
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