As an aside, do we need to consider degradation risk with MMC's stockpiled hard coking coal? Does it need to be discounted in price after some period of time?
Coal begins to lose energy almost the minute it’s mined, through a variety of means.
Upon exposure to the atmosphere, a slow oxidation process begins, essentially burning away heat content. Once the coal is handled—through loading, shipping, unloading, stockpiling, and reclaiming—it will lose energy from dust and fines at each step of the process. In addition, moisture is typically gained during shipping and storage, which results in a variety of negative impacts at the power station. While the coal lies in storage, the oxidation process will continue, accelerated by exposure to the elements, potentially leading to spontaneous combustion.
Although most coal power station personnel understand that these three mechanisms—loss of energy through oxidation, dust and fines, and added moisture—will affect their coal stockpiles, the magnitude of the degradation is often unknown. This article explores the root causes of each of these energy loss pathways, how they affect a power station, the magnitude of the degradation that can occur, and methods for reducing both coal mass and coal quality losses.
http://www.powermag.com/who-moved-my-btus-the-pitfalls-of-extended-coal-storage/
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