Study of the combustion mechanism of oil shale semicoke in a thermogravimetric analyzer
Study of the combustion mechanism of oil shale semicoke in a thermogravimetric analyzer
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DOI：
10.1007/s10973-007-8659-6
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发表时间：
2008-06
影响因子：
4.4
通讯作者：
Xiangxin Han;Xiumin Jiang;Z. Cui
中科院分区：
文献类型：
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作者：
Xiangxin Han;Xiumin Jiang;Z. Cui
油页岩半焦是在蒸馏炉中形成的，是严重的环境污染源，被归类为危险固体废物。针对油页岩半焦在燃烧中的工业应用，本文对其燃烧特性进行了热分析。在Pyris热重分析仪上进行了半焦的热解和燃烧实验。通过热解曲线与燃烧曲线的比较，推断了不同炭化温度下制备的半焦样品的着火机理，发现炭化温度较低的半焦样品为均相着火，随着炭化温度的升高，半焦样品向非均相转变。研究了碳化温度和升温速率对燃烧过程的影响。最后，用二元线性回归方法计算了半焦的燃烧动力学参数，结果表明，活化能随升温速率的增加而增大。
Oil shale semicoke, formed in retort furnaces, is a source of severe environmental pollution and is classified as a dangerous solid waste. For the industrial application of oil shale semicoke in combustion, this present work focused on the thermal analysis of its combustion characteristics. The pyrolysis and combustion experiments of semicoke were conducted in a Pyris thermogravimetric analyzer. From the comparison of pyrolysis curves with combustion curves, the ignition mechanism of semicoke samples prepared at different carbonization temperatures was deduced, and was found to be homogeneous for semicoke samples obtained at lower carbonization temperature, shifting to heterogeneous with an increase in the carbonization temperature. The effect of carbonization temperatures and heating rates on the combustion process was studied as well. At last, combustion kinetic parameters of semicoke were calculated with the binary linear regression method, showing that activation energy will increase with increasing the heating rate.