Furnace Purge would involve allowing some minimum quantity of air to flow
through the furnace (without fuel) for a specified period of time to remove any
unburnt fuel. This activity is done every time boiler is started by running Air
fans and Draft fans as required. It is expected that with 30% airflow
maintained for a period of 5 min, the volume of air is adequate for the furnace
to be purged completely of all the unburnt fuel that may be residual in the
furnace during the previous firing operations thereby removing possible uncontrolled
ignition/explosion during next firing operation.The Purge cycle is performed
with furnace maintained under the design pressure(draft) conditions.
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