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

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

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Fuels and Combustion
Producer gas containing least amount of tar is produced by the

Atmospheric pressure gasification of coal (e.g., in Kopper-Totzek gasifier)
Partial combustion of large size (< 50 mm) coke
Partial combustion of coal
High pressure gasification of coal (e.g. in Lurgi gasifier)

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