Calculation of Apparent Activation Energy of Coal Oxidation at Low Temperatures by Measuring CO Yield

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Calculation of Apparent Activation Energy of Coal Oxidation at Low Temperatures by Measuring CO Yield

机译：通过测量CO收率计算低温下煤氧化的表观活化能

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By analyzing previous studies on activation energy of coal oxidation at low temperatures, a theoretical calculation model of apparent activation energy is established. Yield of CO is measured by using the characteristic detector of coal oxidation at 30-90 ℃. The impact of parameters, such as airflow and particle size, on activation energies is analyzed. Finally, agreement was obtained between activation energies and the dynamic oxygen absorbed in order to test the accuracy of the model. The results show that: 1) a positive exponential relation between concentration of CO and temperature in the process of the experiment is obtained: increases are almost identical and the initial CO is low; 2) the apparent activation energies increase gradually with the sizes of particle at the same airflow, but the gradients increase at a decreasing rate; 3) the apparent activation energies increase linearly with airflow. For the five coal particles, the differences among the energies are relatively high when the airflow was low, but the differences were low when the airflow was high; 4) the optimum sizes of particle, 0.125-0.25 mm, and the optimum volume of airflow, 100 mL/min, are determined from the model; 5) the apparent activation energies decrease with an increase in oxygen absorbed. A negative exponential relation between the two is obtained.

机译：通过分析以往对煤低温氧化活化能的研究，建立了表观活化能的理论计算模型。使用30-90℃的煤氧化特性检测器测量CO的产率。分析了诸如气流和颗粒大小等参数对活化能的影响。最后，在活化能和吸收的动态氧之间取得了一致，以测试模型的准确性。结果表明：1）在实验过程中，CO的浓度与温度呈正指数关系：增加几乎相同，初始CO较低。 2）在相同气流下，视在活化能随颗粒尺寸的增加而逐渐增加，但梯度以减小的速率增加; 3）表观活化能随气流线性增加。对于这五个煤颗粒，当气流较低时，能量之间的差异较大，而当气流较高时，能量之间的差异较小。 4）从模型中确定最佳颗粒尺寸（0.125-0.25 mm）和最佳气流体积（100 mL / min）; 5）表观活化能随吸收的氧气增加而降低。获得两者之间的负指数关系。

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《矿业科学技术（英文版）》 |2006年第1期|37-41|共5页
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School of Mining and Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;

School of Mining and Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;

School of Mining and Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;

School of Mining and Safety Engineering, China University of Mining & Technology, Xuzhou, Jiangsu 221008, China;

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正文语种 chi
中图分类矿山防火;
关键词
coal oxidation at low temperature; apparent activation energy; particle size; airflow;

机译：低温煤氧化;表观活化能;粒径;气流;

Calculation of Apparent Activation Energy of Coal Oxidation at Low Temperatures by Measuring CO Yield

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