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Low temperature pyrolysates distribution and kinetics of Zhaotong lignite

机译:昭通褐煤的低温热解产物分布及动力学

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摘要

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 WC 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. (C) 2016 Elsevier Ltd. All rights reserved.
机译:本文旨在确定昭通褐煤在低温热解过程中产生的所有物种的分布,并推导合适的动力学模型。使用没有载气的固定床反应器系统。对于产品(焦油,天然气和半焦油)分布的确定,在不同的操作因素上进行了实验。使用气相色谱仪(GC),气相色谱仪/质谱选择性检测器系统(GC / MSD),傅立叶变换红外光谱(FTIR),氮吸附-解吸等温线分析和扫描电子显微镜(SEM)分析热解产物的特性。 Coats-Redfern的动力学模型被用作预测实验演化曲线的基础。在此可以看出,温度,加热速率和粒度在低温热解产物的分布中起着关键作用。同时,提出WC和O / C的原子比与产物收率有一定的相关性。通过实验分数讨论了Costs-Redfern积分模型的预测,表明该模型适用于说明褐煤在低温热解过程中的反应机理。 (C)2016 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Energy Conversion & Management》 |2016年第4期|11-19|共9页
  • 作者单位

    Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China;

    Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China;

    Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China;

    Taiyuan Univ Technol, Key Lab Coal Sci & Technol, Minist Educ & Shanxi Prov, Taiyuan 030024, Peoples R China;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Lignite; Low temperature pyrolysis; Tar; Gas; Semi-char; Kinetics;

    机译:褐煤;低温热解;焦油;煤气;半焦;动力学;

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