苏鲁豫皖四省毗邻地区天然焦特征及燃烧特性

碳达峰碳中和背景下提高资源利用效率尤为重要，然而天然焦长久以来并未得到应有的重视。我国天然焦资源丰富，在苏鲁豫皖四省毗邻地区的煤矿开采中经常发现由于岩浆岩侵入，煤层受到烘烤而变质为天然焦的现象。广泛采集苏鲁豫皖四省毗邻地区天然焦样品，在描述天然焦宏观及显微特征的基础上，对天然焦开展工业分析、地球化学特征、自燃倾向性和焦尘爆炸性等方面的测试与分析，采用美国TA2100热分析仪测试典型样品的燃烧特性。结果表明:天然焦的宏观物理特性、显微组分特性与煤具有明显的差异性；总体上各项分析指标与无烟煤没有明显的界线，天然焦与同地的残留煤相比，其挥发分产率降低、C/H比大幅提高；天然焦变质程度达到或高于无烟煤阶段，不易自燃、焦尘无爆炸性。燃烧特性测试结果表明山东菏泽赵楼天然焦样品具有较强的反应活性，并根据天然焦的特性探讨了利用方向，认为其在制作型煤、合成氨、碳材料、生产水泥以及CO₂地质封存等方面具有利用价值或潜力。 

Specific properties and combustion characteristics of natural coke from adjacent areas of Jiangsu,Shandong, Henan and Anhui provinces

It is particularly important to improve resource utilization efficiency against the background of carbon peak and carbon neutrality, but the natural coke has not been paid enough attention for a long time. The natural coke is abundant in China and is often found in the mining of coal mines in neighboring areas of Shandong, Henan and Anhui provinces. Due to the intrusion of magmatic rock, the original coal seam is baked and transformed into natural coke. In this study, samples of natural coke from various areas were collected to study its macroscopic and microscopic characteristics. The industrial analysis, geochemical parameters, spontaneous combustion tendency and coke dust explosive were studied. At the same time, typical samples were selected to analyze the combustion characteristics by American TA2100 thermal analyzer. The results show that the macroscopic physical properties and maceral properties of natural coke are obviously different from those of coal. On the whole, there is no obvious boundary about the analysis indexes of natural coke and anthracite. The index of volatile yield and C/H values for natural coke and the residual coal in the same place is significantly decreased by the former, and greatly increased by the latter. The metamorphic degree of natural coke is generally reached or higher than that of anthracite, and it is not easy to spontaneous combustion with its coke dust non-explosive. The analysis of combustion characteristics shows that the natural coke sample has strong reactivity. Furthermore, the utilization direction of natural coke was discussed according to its characteristics, and there is value or potential in the production of briquette, ammonia synthesis, carbon materials, cement production and CO₂ geological storage.