Fuels and Combustion
Which of the following accentuates clinker-ing trouble on furnace grate burning coal?

Thick fire bed and preheated primary air
Low forced draught and fuel bed temperature
All of these
Low reactivity of carbonised residue containing high proportions of iron & sulphur

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Fuels and Combustion
Cannel coal

Has a high volatile matter content and burns with a luminous smoky flame
Is non-coking
Is a non-banded coal which can be ignited easily with a match stick or candle flame, hence is so named
All of these

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