How to Calculate Boiler Efficiency

To some extend, boiler efficiency directly affects its cost and factory’s productive efficiency, therefore, customers are always looking for a higher efficiency boiler and boiler makers are trying their best to improve boilers’ efficiency to better meet market’s demands. Somehow a boiler’s actual efficiency depends its brand, burner, auxiliaries, installation, operator, fuel, etc.

high efficiency gas oil fired boiler to 98.17%

There are two method to measure the boiler efficiency, that is, direct method and indirect method.

Direct method -direct method of boiler efficiency test is more usable or more common

boiler efficiency =Q*(Hg-Hf)/q*GCV *100 Q =Total steam flow Hg= Enthalpy of saturated steam in k cal/kg Hf =Enthalpy of feed water in kcal/kg q= quantity of fuel use in kg/hr GCV =gross calorific value in Kcal/kg like pet coke (8200 KCAL/KG)

indirect method -to measure the boiler efficiency in indirect method we need a following parameter like 1)Ultimate analysis of fuel (H2,S2,S,C moisture constraint,ash constraint); 2)percentage of O2 or CO2 at flue gas; 3)flue gas temperature at outlet; 4)ambient temperature in deg c and humidity of air in kg/kg; 5)GCV of flue in Kcal/kg 6)ash percentage in combustible fuel 7)GCV of ash in Kcal/kg.

ZBG is a trusted boiler manufacturer, supplier and exporter, supplying high efficiency steam boilers, hot water boilers and power plant boilers for global customers. Our WNS series gas oil fired boiler efficiency is up to 95%, and some CFB boiler efficiency can reach 91.86%! Find more high efficiency boilers, contact us by emailing to zbgboiler@zzboiler.com or call 86-371-86062323!