Page 16 - Bosch Boiler House Component

16 | Boiler house components

Feed water cooling module FWM

The flue gas temperature is an important criterion for  Thermal stresses caused by too cold feed water
assessing the efficiency of a steam boiler system. Older flowing into the boiler
and smaller systems have often relatively high flue gas  Corrosion caused by unwanted condensation of the
temperatures, which is accompanied by unnecessary flue gas when it is cooled down too much
high fuel costs. For systems with medium to high oper-
ating hours technical solutions for reducing the flue gas The feed water cooling module FWM is an effective
losses such as condensing heat exchangers or air and reliable method of reducing energy costs.
preheating systems pays off quickly. However, the feed
water cooling module is the most cost-effective alterna- Equipment level
tive for systems with lower operating hours. It is easy The feed water cooling module consists of an insulated
to retrofit and particularly suitable for: plate-type heat exchanger, valves, pipe connection
 Boilers with low to medium condensate pieces and temperature sensors. It is delivered instal-
recirculation lation-ready on a base frame. The dimensioning of the
 Systems without modules for fresh water module and the parameterisation of the control are
preheating made specifically to order – based on the system’s
 In the case of continual hot water demand, e.g. mode of operation.
for office buildings or industrial processes
 Boiler systems with economizers but without Benefits at a glance:
downstream condensing heat exchangers  Up to 1.8 % fuel cost saving
 Boilers with low operating hours, e.g. production  Easy retrofitting to older systems thanks
with single-shift operation to a small space requirement and simple piping
 Boilers with an output < 10 t/h  Matched control for safe operation of the boiler and
components
Construction  Quick amortisation, even on systems with few
Cold make-up water is heated up in the feed water operating hours
cooling module by using the warm feed water in a heat  Ready for operation with just a few connections
exchanger. As a result of the feed water cooling down,  Simple commissioning, operation and maintenance
there is a larger temperature difference between the
water and flue gas in the economizer. The flue gas
outlet temperature decreases due to the better heat
transfer in the economizer. The firing efficiency is thus
enhanced by up to 1.8 %. The control of the module
ensures that the temperatures and flow rates are al-
ways within the permitted range. It thereby prevents:

Water/Condensate 1 Feed water cooling module
Steam 2 Economizer
Flue gas 3 Steam boiler
4 Water service module
Extremely simplified diagram