Boiler Evaporation Ratio Formula
Boiler is one of the most important components for processing plant because which provide heating medium as steam at rate of required quantity with optimum quality. Many customers are concerned about boiler efficiency and boiler evaporation ratio.
Evaporation ratio:
It is ratio of amount of steam generated to the amount fuel consumed by boiler. Evaporation, frequently termed as the capacity of boiler, is the amount of steam, expressed in kg or tonne which it can raise per hour at full load.
The boiler evaporation ratio is expressed as follows:
Evaporation ratio = quantity of steam generation/quantity of fuel consumed.For example quantity of steam Is 310 ton/hr and fuel is 55 ton/hr then the evaporation ratio is 5.63. Evaporation ratio is also known as steam fuel ratio.A drop in evaporation ratio indicates drop in boiler efficiency.Boiler evaporation ratio depends on fuel quality. Higher calorific value of fuel having higher evaporation ratio.
Value of evaporation ratio for different types of boiler is listed as-
1.Coal fired boiler- 4.0-6.0.
2.Oil fired boiler- 13.0-14.5 .
3.Gas fired boiler- 11.0-13.
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