Page 8 - Bosch Modernisation of Boiler Systems

8 | Modernisation of boiler systems

Modernisation measures in detail

Save fuel costs through heat recovery ...

... from flue gas up to 14 %
The flue gas temperature can be reduced by more
than 100 Kelvin through the use of a flue gas heat A 10 % fuel
saving in a
exchanger (economizer). A downstream condensation system with
heat exchanger extracts further energy from heat and 10 t/h steam
condensation. capacity means
a saving of up
to 150,000
... from condensate up to 12 % euros per year.
Condensate is water that has already been treated
and that also contains energy. By feeding it back to
the water circuit, less cold fresh water has to be
treated and heated.

... from desalting up to 1 %
Desalting water contains energy in form of pressure
and heat that can be recovered. Further, wasting of
fresh water to cool down this hot boiler water can be
avoided.

Save energy costs through the firing ...

... of up to 40 % by switching fuel
Energy costs per kWh vary depending on the fuel.
Switching to another fuel can often have a payback A fuel price
difference of
period of only a few months while generating savings 20 % per kWh
over decades. If multi-fuel firing is retrofitted, peak saves up to
loads can be covered by a second fuel. 285,000 euros
per year on
a 10 ton boiler.
... of up to 4 % by optimising the firing
Combustion control balances out changes in opera-
ting conditions, such as temperature, pressure and
gas quality – for a high level of combustion efficiency.
Intelligent system control and a high modulation
range reduce unnecessary cold starts and pre-ventila-
tion losses when starting up. Reduced
dependence on
one fuel thanks
... reduce the power consumption of up to 75 % to multi-fuel
through efficient electrical consumers firing.
Conventional firing fans are operated at 100 % load
even when the boiler is at partial load. The excess
energy is “destroyed” by throttling the air flow.
Speed-controlled motors and burner control not only
save you power, your boiler will also be significantly
quieter at partial load.