Economizer Efficiency :
Economizer
is used to increase efficiency, reduce waste and conserve energy by using waste
heat for the heating feed water in boiler system. We can get efficiency of Economizer
closer to 88 - 95%. Economizer is installed in between boiler and chimney to
recover heat from the hot flue gases which are released in atmosphere through
chimney. By installing economizer, we can enhance the overall energy efficiency
of the boiler system. Economizer can be either condensing or non-condensing
economizer. By installing economizer, we can increase reduce the fuel
consumption by up to 20%. Every approx. 15 Degree C reduction in stack
temperature, we can increase 1% boiler efficiency.
The
efficiency of the economizer is the ratio of the heat gained by the feed water
passing through the tubes of economizer and the heat given away by the hot flue
gases passing over the tubes of the economizer.
Economizer
efficiency = Ma (T2 - T1) / Mf x Cp (Tf1 - Tf2)
Cp =
Specific heat of flue gases
Ma =
Mass of steam produced per kg of fuel burnt
Mf = Mass of flue gases produced per kg of
fuel burnt
Tf1=
Temperature of hot flue gases entering in economizer
Tf2
= Temperature of hot flue gases leaving from economizer
T1 =
Feed water temperature entering in economizer
T2 =
Feed water temperature leaving from economizer
