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首页> 外文期刊>Fuel >Reaction kinetics of pulverized coal-chars derived from inertinite-rich coal discards: Gasification with carbon dioxide and steam
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Reaction kinetics of pulverized coal-chars derived from inertinite-rich coal discards: Gasification with carbon dioxide and steam

机译：来自富含惰质石的煤渣的粉状煤焦的反应动力学：用二氧化碳和蒸汽气化

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An investigation was undertaken to determine the kinetics of gasification of coal-chars (pulverized) derived from typical South African inertinite-rich (high-ash) coals involving char reactions with carbon dioxide and steam and the effects of carbon monoxide and hydrogen. The chars used were characterized with respect to structural, chemical, mineralogical and petrographic (maceral content) properties and gasification experiments were conducted in a TGA at atmospheric pressure with different gas mixtures within a temperature range of 1073-1223 K. The shrinking core model with a controlling surface reaction was shown to be applicable for the gasification of pulverized coal-chars consisting of essentially of carbon-rich particles. The validity of this model can be attributed to the core having an exceptional low porosity (high inertinite parent coal) and consequently negligible penetration of the gases. It was found that the gasification intrinsic reaction rates could be adequately described by Langmuir-Hinshelwood type rate equations and that established equations have been validated with corresponding constants according to new data processing procedures. It was found that the reaction rate constants for coal-chars derived from inertinite-rich (76-80 percent) coal discards were different to results published in the literature and that the intrinsic reaction rates differed only slightly (order of magnitude) for coal-chars with similar maceral (inertinite) compositions and different total ash contents. The marked inhibiting effect of the carbon monoxide and hydrogen on the carbon dioxide/carbon monoxide and steam/hydrogen gasification reactions is shown and relevant constants are reported. Experiments were done and models evaluated for a multi-component gasification mixture consisting of a feed mixture of carbon dioxide, carbon monoxide, steam and hydrogen. Reaction constants determined with results from binary mixtures were used to predict results and it was found that the overall rate is best described with the assumption that the important reactions proceed on separate sites.
机译：进行了一项调查，以确定由典型的富含南非惰质石（高灰分）的南非煤制成的煤焦（粉状）的气化动力学，涉及与二氧化碳和蒸汽的炭反应以及一氧化碳和氢气的影响。对所用焦炭的结构，化学，矿物学和岩石学（宏观含量）特性进行了表征，并在大气压下于1073-1223 K的温度范围内在不同气体混合物下于TGA中进行了气化实验。已证明控制表面反应适用于气化基本上由富碳颗粒组成的煤粉的气化。该模型的有效性可以归因于岩心具有极低的孔隙度（高惰化母煤），因此气体的渗透率可忽略不计。已经发现，气化内在反应速率可以用Langmuir-Hinshelwood型速率方程来充分描述，并且已建立的方程已根据新的数据处理程序用相应的常数进行了验证。结果发现，从富含惰质石（76-80％）的煤屑中提取的煤焦的反应速率常数与文献中公布的结果不同，对于煤-，固有反应速率仅略有不同（数量级）。具有类似的一般（惰性）组成和不同的总灰分含量的炭。显示了一氧化碳和氢气对二氧化碳/一氧化碳和蒸汽/氢气气化反应的显着抑制作用，并报道了相关常数。对由二氧化碳，一氧化碳，蒸汽和氢气的进料混合物组成的多组分气化混合物进行了实验并评估了模型。由二元混合物的结果确定的反应常数用于预测结果，并且发现在重要反应在单独的位置进行的前提下，可以最好地描述总速率。

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