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Interactions between oil shale and its semi-coke during co-combustion

机译：共燃过程中油页岩与其半焦之间的相互作用

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摘要

In the present work, thermogravimetric analysis was employed to investigate the interactions between oil shale and its semi-coke during co-combustion process. During the test, the blends of semi-coke and oil shale were prepared at different blending ratios of 1:0,4:1,3:1,2:1,1:1, and 0:1. The results indicated some interactions were detected between oil shale and semi-coke during the tests. The rapid combustion of organic matter in oil shale, which led to the fuel particle temperature's rapid increase and made semi-coke ignite in advance, improved the co-combustion characteristics in terms of ignition temperature (T_i), the temperature reaching the maximum mass loss rate (T_(max)), the maximum mass loss rate (R_(max)) the combustibility index (C) and the specific reactivity of the co-combustion. With the increase in semi-coke mass fraction in the blends, the specific reactivity of the samples was found to decrease gradually due to lower volatile content and high carbon condensation structure in semi-coke. As the temperature increased, the specific reactivity of the samples first gradually increased, then decreased attributed to the oxidation of selectivity. The poor diffusion caused mainly by the ash shells made the decomposition of minerals more complicated. It was also analyzed that the 'particle groups' phenomenon that the dispersed particles are agglomerated by some forces in semi-coke ash went against the decomposition of minerals.rnActivation energies E from distributed activation energy (DAEM) slowly decreased at the initial stage, then increased sharply over a narrow conversion region, which indicted a difficult burnout stage. Meantime, a power law model was employed to investigate quantitatively the interactions. The experimental reaction orders could be predicted accurately from the calculated values. At the third stage, the kinetic parameters E_3 and A_3 were almost as much as the calculated values. At the low temperature region (470-540 ℃), there was little difference between kinetic parameters E and A from the experiment data and the calculated data.
机译：在目前的工作中，采用热重分析法研究了共燃过程中油页岩与其半焦之间的相互作用。在测试过程中，半焦炭和油页岩的共混物以不同的混合比1：0,4：1,3：1,2：1,1：1和0：1进行制备。结果表明在测试过程中检测到油页岩和半焦之间存在一些相互作用。油页岩中有机物的快速燃烧导致燃料颗粒温度的快速升高并提前使半焦点燃，从而改善了着火温度（T_i）的共燃特性，温度达到最大质量损失燃烧率（T）（T_（max）），最大质量损失率（R_（max）），可燃指数（C）和混合燃烧的比反应性。随着共混物中半焦质量分数的增加，发现样品的比反应性由于半焦中较低的挥发物含量和高碳缩合结构而逐渐降低。随着温度升高，样品的比反应性首先逐渐升高，然后由于选择性的氧化而降低。主要由灰壳引起的不良扩散使矿物的分解更加复杂。分析还发现，半焦灰中的某些力使分散的颗粒团聚的``颗粒群''现象不利于矿物的分解.rn活化能E（DAEM）的活化能E在初始阶段缓慢下降，然后在狭窄的转化区域内急剧增加，这表明一个艰难的倦怠阶段。同时，采用幂律模型对相互作用进行定量研究。实验反应顺序可以根据计算值准确预测。在第三阶段，动力学参数E_3和A_3几乎等于计算值。在低温区域（470-540℃），从实验数据和计算数据得出的动力学参数E和A之间几乎没有差异。

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  • 来源
    《Fuel》 |2009年第8期|1520-1529|共10页
  • 作者

    Qing Wang; Haigang Wang; Baizhong Sun; Jingru Bai; Xiaohui Guan;

  • 作者单位

    School of Energy Resources and Mechanical Engineering, Northeast Dianli University, Jilin 132012, China;

    School of Energy Resources and Mechanical Engineering, Northeast Dianli University, Jilin 132012, China;

    School of Energy Resources and Mechanical Engineering, Northeast Dianli University, Jilin 132012, China;

    School of Energy Resources and Mechanical Engineering, Northeast Dianli University, Jilin 132012, China;

    School of Energy Resources and Mechanical Engineering, Northeast Dianli University, Jilin 132012, 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

    thermogravimetric analysis co-combustion; semi-coke; oil shale; reactivity;

    机译：热重分析共燃烧;半焦油页岩;反应性;

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