Abstract

The yields of coal liquids (maltenes and asphaltenes) formed upon the heat treatment of three low-metamorphosed Kuzbass coals with different hydrogenation ability parameters in an atmosphere of hydrogen were compared. It was found that the H/C atomic ratios, the yields of volatile substances, the relative maximum rates of pyrolysis of coals in a range of 300–500°C, and the ratios between aliphatic and aromatic structures [(D₂₉₂₀ + D₂₈₆₀)/D₁₆₀₀] in the test coals increased linearly with an increase in the yields of liquid products in the order Karakan long-flame coal < Itat brown coal < Barzas sapromixite. The best correlation (R = 0.9792) was observed between the yields of liquid products and the [(D₂₉₂₀ + D₂₈₆₀)/D₁₆₀₀] ratios. The thermal transformations of two types of Barzas sapromixites [a tile-like modification (“tile”) and its weathering product (gunny-like coal)] in different atmospheres (Н₂ and СО₂) were studied. It was found that a higher yield of coal liquids was observed upon the heat treatment of the Barzas sapromixites in an atmosphere of hydrogen, as compared with that upon their thermal conversion in an atmosphere of carbon dioxide. In the course of the heat treatment of the tile-like Barzas coal in an atmosphere of hydrogen, the yield of coal liquids (~37.7 wt %) was higher by a factor of >1.5 and the yield of gases (~10.3 wt %) was lower by a factor of >2 than those in similar experiments with the gunny-like coal.

中文翻译：

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不同气氛下低变质库兹巴斯煤的热转变及直接液化过程中煤加氢能力的预测

摘要

比较了三种不同加氢能力参数的低变质库兹巴斯煤在氢气气氛中热处理后形成的煤液体（麦芽烯和沥青质）的产率。发现 H/C 原子比、挥发性物质的产率、煤在 300-500°C 范围内的最大热解速率以及脂肪族和芳香族结构之间的比率 [( D ₂₉₂₀ + D ₂₈₆₀ )/ D ₁₆₀₀ ] 在测试煤中随着液体产物产量的增加而线性增加，顺序为卡拉坎长焰煤 < Itat 褐煤 < Barzas 腐泥土。最佳相关性 ( R= 0.9792) 在液体产物的产率和 [( D ₂₉₂₀ + D ₂₈₆₀ )/ D ₁₆₀₀ ] 比率之间观察到。两种类型的 Barzas 腐泥土 [一种瓦状变体（“瓦”）及其风化产物（麻状煤）] 在不同大气（Н ₂和 СО ₂）中的热转变) 进行了研究。发现与在二氧化碳气氛中热转化相比，在氢气气氛中热处理 Barzas 腐泥土时观察到更高的煤液体收率。在氢气气氛中对瓦状 Barzas 煤进行热处理的过程中，煤液体的产率（~37.7 wt %）高出 1.5 倍以上，而气体的产率（~10.3 wt %）比用麻状煤进行的类似实验低 2 倍以上。