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Why air flow is maintained at 30 percent of total air for boiler purging?
Wiki User
∙ 11y ago
The basic objective of purging is to clean up the residual combustibles within the combustion chamber of the boiler rather furnace. The amount of purge air is determined by purpose of the purging. In boiler, out of 100% of the total air, about 30% is to fulfil the stoicheometric requirement of combustion and about 70% is the excess air.
Therefore, 30% air flow is sufficient to blow off the unburnt incombustible and saving thereby unnecessary wastage of fan power.
In another aspect, more than 30% supply may initiate explosive uncontrolled combustion of accumulated combustible within combustion zone if the air: fuel ratio is more air rich and having sufficient temperature to get ignited.
Therefore, assuming maximum 100% fuel availability at the time of purging within the combustion zone purging air is limited to 30% to avoid the air-rich condition as well as to complete the process of purging
Wiki User
∙ 11y ago
sharmaprateek11
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