comparison between economizer and air preheater
In terms of Efficiency-
Economizer-Increase
the temperature of feed water
Air
pre heater(APH)-Increase
the temperature of combustion air
In terms of corrosion in boiler-
Economizer-The
corrosion in boiler is due to the dissolve oxygen in the water. These
dissolve gases will come out of water at higher temperature, which will be
taken care in the Economizer automatically.
Air pre heater(APH)-Corrosion can
not avoid just by placing air preheater
In terms of ambient
condition-
Economizer-No any effect
Air pre heater(APH)- if atmospheric conditions change
than result in to the change in the volume of combustion Air, which will affect the efficiency of system.
In terms of repairing/maintenance Cost-
Economizer-High cost in comparison with air preheater
Air pre heater(APH)-Low
cost in comparison with economizer
In terms of heat transfer coefficient -
Economizer-higher 50 to 300 W/m2-deg.C
Air pre heater(APH)- lower 10 to 50 W/m2-deg.C
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