期刊
PROCEEDINGS OF THE COMBUSTION INSTITUTE
卷 33, 期 -, 页码 2515-2522出版社
ELSEVIER SCIENCE INC
DOI: 10.1016/j.proci.2010.06.046
关键词
Coal; Oxidation at moderate temperatures; Retarding additives; Control of self-heating phenomena
The impact of an additive on coal oxidation process is studied from the mechanistic perspective, aiming at development of a guideline in search of effective inhibitors for controlling the coal self-heating phenomena. The salt Na3PO4 was chosen as an additive. Behaviors of samples with/without the additive were examined at temperatures up to 400 degrees C both in oxidative and inert atmosphere using a TGA instrument, and the compounds on coal surface during oxidation and pyrolysis were monitored by FT-IR technique. The TGA data show that the impact of the additive on coal oxidation process can be directly evaluated using a parameter defined as the percentage of mass increase at similar to 265 degrees C, and the addition of Na3PO4 slows down the rates of oxygen uptake and decomposition reactions. FT-IR results also indicate that the additive suppresses both the coal oxidation and pyrolysis processes essentially by accelerating the formation of saturated ether linkages. Further analysis suggests that Na3PO4 plays a role in modifying the routes for decomposition of hydroxyl, and subsequently improving the coal thermal stability. (C) 2010 The Combustion Institute. Published by Elsevier Inc. All rights reserved.
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