Calculate Boiler Efficiency

Boiler Efficiency = Boiler capacity

Fuel energy

% n = Msteam x (E steam- Efw)

Nvc x Mfuel

Msteam = Boiler capacity Kg./hr

E fw = Enthalpy water supply Kcal/Kg

E steam = Enthalpy steam Kcal/Kg

Nvc = Fuel heat value (kcal/kg or kcal/Nm)

M fuel = Mass fuel Nm / hr.

Nvc = Fuel heat value (kcal/kg or kcal/Nm)

M fuel = Mass fuel Nm / hr.

% n = Boiler efficiency

Example Boiler 10 t/h working pressure 13 barg feed water temperature 102 oC fuel heat value 10200 kcal/kg

Boiler efficiency 90% Find fuel consumption?

Msteam = Boiler capacity Kg./hr

E fw = 102 Kcal/Kg

E steam = 663.45 Kcal/Kg

Nvc = 10200 kcal/kg

% n = 0.90

Calculate Boiler Efficiency

M fuel = 10000 x ( 663.45 102 )

10200 x 0.90

= 611.6 kg/hr.

Change unit = 611.6/0.84

= 728.1 liter/hr

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