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首页> 美国卫生研究院文献>Materials >Effects of Boron Carbide on Coking Behavior and Chemical Structure of High Volatile Coking Coal during Carbonization
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Effects of Boron Carbide on Coking Behavior and Chemical Structure of High Volatile Coking Coal during Carbonization

机译：碳化硼对碳化期间高挥发焦煤焦化行为及化学结构的影响

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Modified cokes with improved resistance to CO2 reaction were produced from a high volatile coking coal (HVC) and different concentrations of boron carbide (B4C) in a laboratory scale coking furnace. This paper focuses on modification mechanism about the influence of B4C on coking behavior and chemical structure during HVC carbonization. The former was studied by using a thermo-gravimetric analyzer. For the latter, four semi-cokes prepared from carbonization tests for HVC with or without B4C at 450 °C and 750 °C, respectively, were analyzed by using Fourier transform infrared spectrum and high-resolution transmission electron microscopy technologies. It was found that B4C will retard extensive condensation and crosslinking reactions by reducing the amount of active oxygen obtained from thermally produced free radicals and increase secondary cracking reactions, resulting in increasing size of aromatic layer and anisotropic degree in coke structure, which eventually improves the coke quality.
机译：通过高挥发性焦煤（HVC）和实验室规模焦化炉中的高挥发性焦煤（HVC）和不同浓度的碳化硼（B4C）产生改进的焦化。本文重点研究了B4C对HVC碳化过程中焦化行为和化学结构影响的改性机制。使用热量重量分析仪研究前者。对于后者，通过使用傅里叶变换红外光谱和高分辨率透射电子显微镜技术分别分别分别在450℃和750℃下使用具有或不具有B4C和750℃的HVC的碳化试验中制备的四个半焦。发现B4C将通过减少从热产生的自由基获得的活性氧量并增加二次裂解反应，延长了广泛的缩合和交联反应，从而增加了芳族层的尺寸和焦炭结构的各向异性程度，最终改善了焦炭质量。

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