This image shows a typical boiler energy balance for a boiler in good running condition with no energy efficiency measures added. By first identifying the areas of energy loss and roughly quantifying it, it is easier to estimate the overall savings potential by taking efficiency action in that area. For example, if the blowdown loss is 3% of total input energy, it is not possible to expect a 5% savings of input energy by installing a blowdown heat recovery system.

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Heat Loss in Flue Gases

Economizers

Flue Gas Condensers

Flue Gas Analysis

Flue Gas Analysis Table

Oxygen Control (O2 Trim)

Air Infiltration

Exhaust Draft Control

Vent Dampers

Scale Deposits

Turbulators

 

Combustion Efficiency Improvement

Oxygen Control (O2 Trim)

Air Infiltration

Flue Gas Condensers

Flue Gas Analysis

Exhaust Draft Control

Boiler Reset Control

Boiler Sequence Control

Combustion Air Pre-Heater

 

Heat Loss In Blowdown

Blowdown Control

Blowdown Heat Recovery

Deaerator

Radiation and Convection Losses

Boiler Reset Control

Boiler Sequence Control

Vent Dampers

Exhaust Draft Control

Steam System Improvements

Condensate Return

Flash Steam Recovery

Insulate Fittings

Insulate Steam Pipes

Steam Leaks

Steam Piping Best Practices

Steam Traps

Steam Trap Leaks

Steam Vapor Recompression

Source: Image Boiler Energy Balance from 'Boilers and Heaters: Improving Energy Efficiency' Natural Resources Canada, 2001;