Storage weathering of coal results in_______________?
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Answer: D. All A., B. and C.
Explanation
Weathering causes atmospheric oxygen to attack the coal matrix, leading to internal micro-fracturing. This oxidation breakdown increases the friability of the coal, causing lumps to crumble easily. Oxidized volatile bitumens lose their softening capability, resulting in a severe decrease in caking capacity. Storage weathering is a slow low temperature oxidation process that degrades stacked coal piles. Friability measures the tendency of solid materials to break down into smaller pieces during handling. Caking capacity is essential for coke manufacturing, making weathered coal unsuitable for blast furnaces.
Power plant operators rotate coal inventory stockpiles to prevent severe weathering and degradation. Degraded friable coal generates excessive dust during pneumatic conveying and mechanical handling operations. Proper storage management protects the economic value and combustion performance of stored coal reserves. Option reduction in coal size is correct, but friability and caking capacity are equally valid impacts. Option increase in friability is correct, but size reduction and caking loss also occur simultaneously. Option all a b and c correctly groups all the detrimental effects caused by storage coal weathering.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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