Thermal Transformations of Low-Metamorphozed Kuzbass Coals in Different Atmospheres and Prediction of Coal Hydrogenation Ability in Direct Liquefaction Processes.

Autor: Ushakov, K. Yu., Petrov, I. Ya., Bogomolov, A. R.
Zdroj: Solid Fuel Chemistry; Jul2021, Vol. 55 Issue 4, p207-215, 9p
Abstrakt: 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. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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