Fuels and Combustion
The function of secondary combustion air is to

Completely burn the volatile matter
Burn the lumpy coal
None of these
Pneumatically convey the pulverised coal

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

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

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