Ratio of primary air to secondary air increases with increase in the rank of coal, because the__________________?
Correct answer: B. Ratio of fixed carbon to volatile matter increases
- A. High rank coals have higher amount of volatile matter
- B. Ratio of fixed carbon to volatile matter increases
- C. Oxygen content progressively decreases
- D. Calorific value of the coal increases
Explanation
As coal rank increases, volatile matter decreases while fixed carbon becomes a larger fraction of the coal. More air must therefore be supplied as primary air for the solid carbon, increasing the primary-to-secondary air ratio.
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