Which of the following factors favours high thermal stability of coke in the blast
furnace?
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A.
High chemical reactivity
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B.
Absence of large lumps in feed coke
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C.
Low carbonisation temperature
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D.
Maximum inert inclusions of large sizes
Correct Answer:
B. Absence of large lumps in feed coke
Explanation:
The thermal stability of coke in a blast furnace is primarily enhanced by the absence of large lumps in the feed coke. When coke contains large, irregular lumps, it is more susceptible to thermal shock and mechanical stress, leading to premature cracking and degradation as it descends through the furnace. Using more uniform, smaller-sized coke—such as nut coke—improves the consistency of the burden, ensures more stable gas permeability, and provides better resistance to the extreme temperature fluctuations within the thermal reserve zone. Unlike high chemical reactivity, which can lead to excessive carbon loss, or low carbonization temperatures, which result in physically weaker "immature" coke, a controlled particle size without oversized lumps maintains the structural integrity required to support the furnace burden.
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