Certified Energy Manager (CEM)

A boiler's flue gas economizer improves overall system efficiency by performing which of the following functions?

Recirculating a portion of the flue gas back into the burner to reduce NOx emissions. Using hot flue gas to preheat the combustion air before it enters the burner. Transferring waste heat from the flue gas to the incoming boiler feedwater. Using a catalyst to promote more complete combustion of fuel.

Correct Answer:

Transferring waste heat from the flue gas to the incoming boiler feedwater.

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