Effects of low-temperature rapid pyrolysis treatment on the improvement in caking property of a Chinese sub-bituminous coal,Journal of Analytical and Applied Pyrolysis

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Effects of low-temperature rapid pyrolysis treatment on the improvement in caking property of a Chinese sub-bituminous coal
Journal of Analytical and Applied Pyrolysis ( IF 5.8 ) Pub Date : 2018-10-01 , DOI: 10.1016/j.jaap.2018.08.021
Xiangchun Liu , Qiang Ling , Zhigang Zhao , Ruilun Xie , Delei Yu , Qingping Ke , Zhao Lei , Ping Cui

Abstract We proposed a low-temperature rapid pyrolysis treatment (LTRP) to modify the caking property of a sub-bituminous coal. The coal was thermally treated in a rotating furnace in the temperature range 320–500 °C at a heating rate of ca. 80 °C/min. We also conducted an integrated investigation on some physicochemical properties, which were characterized by ultimate analysis, Fourier transform infrared spectrometer, X-ray photoelectron spectroscopy, pore volume, scanning electron microscopy, and thermogravimetry, of the treated coal to determine the modification mechanism. Caking and coking properties were evaluated by caking index (G) and crucible coking experiments, respectively. The results showed that LTRP significantly increased G, which reached the maximum at 410 °C, implying the existence of an optimum temperature. Crucible coking experiments showed that structure strength and micro-strength indices of the resulting cokes were also improved by LTRP treatment. A mechanism was proposed for the modification of the caking property. Suitable upgrading degree with suitable molecular masses and low melting donor hydrogen rich species presented within the coal, which dominated the development of caking property, was important. The synergistic effect of pore volume and the contents of total acidity groups, volatile matter, hydrogen, and oxygen in the coal determined the suitable upgrading degree.

更新日期：2018-10-01

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