Mathematical Modeling of Heat-Exchange Processes in Outdoor Storage of Frozen Coal
Yu. A. Khokholov1, V. L. Gavrilov2, V. I. Fedorov1
1Chersky Institute of Mining of the North, Siberian Branch, Russian Academy of Sciences, Yakutsk, 677980 Russia
2Chinakal Institute of Mining, Siberian Branch, Russian Academy of Sciences, Novosibirsk, 630091 Russia
Keywords: криолитозона, уголь, хранение, открытый склад, окисление, моделирование, тепломассообмен, Центральная и Северная Якутия, Permafrost zone, coal, storage, outdoor storage, oxidation, modeling, heat and mass exchange, Central and North Yakutia
Abstract
The modeling procedure is developed to describe heat-exchange processes in outdoor summer storage piles of frozen coal produced in winter. This procedure takes into account thermophysical properties of coal and the pile bottom soil, pile structure, climatic factors and presence of a heat-insulating coating over the pile. In terms of central Yakutia, it is shown that maximum transition of coal from frozen state (piling in January-Marhc) top thawed condition at the pile height more than 5 m will make 25-35% by the end of the warm season (beginning of October). Application of simple and available heat-insulating materials can reduce thawing intensity by up to 2 times. Natural cold weakens the aggravating effect of oxidizing processes on coal quality in long-term storage of coal and its shipment to remote and hard-to-reach places.
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