The various energy efficiency opportunities in boiler systems can be related to combustion, heat transfer, avoidable losses, high auxiliary power consumption, water quality, and blowdown, and are discussed below. 1.Reduce excess air 2.Minimize stack temperature 3.Avoid incomplete combustion 4.Reduce scaling and soot losses

1. Incomplete combustion can arise from a
shortage of air or sulphur of fuel or
poor distribution of fuel.
AVOID INCOMPLETE
COMBUSTION
Every millimeter thickness of soot coating
increases the stack temperature
by about 55ºC. A deposit of 3mm of soot can
cause an increase in fuel
consumption by 2.5%. A 1mm thick scale
(deposit) on the water side could
increase fuel consumption by 5% to 8%.
REDUCE SCALING AND SOOT
LOSSES
360 Proactive Engineer Presents
5 ENERGY
EFFICIENCY
OPPORTUNITIES IN
BOILERS
A small Tips to improve energy efficiency
awareness. Please share it with others.
1. Feed water preheating from waste heat of
stack gases (Every rise of 6ºC in boiler feed
water temperature through waste heat
recovery would offer about 1% fuel savings.)
2. Combustion air preheating from waste heat
of stack gases (For every reduction in flue gas
temperature by 22ºC for heat recovery, fuel
savings of about 1% can be achieved.)
MINIMIZE STACK
TEMPERATURE
To minimize escape of heat through flue gases,
reduce excess air to reach 2-3% O2 at the
flue gases
REDUCE EXCESS AIR
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