hEat rEcOvEry 15
Steam management brings major
savings in condensate recovery
ith oil and gas prices system as part of its energy saving campaign.
Steam is a major utility remaining unpredictable, Before the project, water entered the boiler at
and, as Sean Ottewell
controlling the cost of around 68 or 70°C. It now arrives at between 138
reports, its proper
W the energy used during and 142°C, according to facilities manager Paul
management is bringing
processing is especially challenging. Rising Gale: “There was a lot of work going on at the
substantial savings to
energy prices can quickly eat into the cost base time, but it’s fair to say that the savings from this
users.
of any process, damaging profitability and project were in the region of 25 per cent of the
competitiveness. As a major utility supplying gas used by the boiler.”
El vapor es una fuente
many processing applications, steam is a highly The FREME system passes condensate from
de energía fundamental,
effective heating medium and many companies the steam distribution system through a flash
y tal como informa Sean have invested in improving their steam system steam separation vessel. The separate flash steam
Ottewell, su gestión
efficiency over the years. One area of focus and condensate streams each travel through
adecuada aporta
has been condensate recovery. Energy from a dedicated plate heat exchanger, where they
substanciales ahorros a
condensate is widely used to pre-heat boiler feed heat the pressurised feed water before it enters
los usuarios.
water, lowering fuel costs and increasing boiler the boiler. The two returning streams are then
efficiency. In fact, each 6°C temperature boost recombined and sent back to the boiler feed tank.
Dampf ist eine bewährte
achieved by condensate recovery will knock one At this point the combined stream is sub-cooled,
Energiequelle und laut
percent off a typical boiler energy bill. so it is sufficiently warm to begin heating the cold
einem Bericht von Sean However, some condensate recovery systems feed but not hot enough to cause cavitation in the
Ottewell sorgt der are so effective that too much energy is sometimes feed pump.
richtige Umgang mit
captured. With the boiler feed tank running A great advantage of the FREME system
Dampf für beträchtliche
at atmospheric pressure feedwater is usually is that it can be supplied as a pre-engineered,
Ersparnisse.
maintained at just 85°C or 90°C. Higher skid-mounted system, taking the stress out of
temperatures risk cavitation in the boiler feed designing, specifying, building and installing
pump, causing significant damage. This places a steam, hot water and other systems (Fig. 1).
natural limit on the amount of heat that can be Buying a complete package from a single supplier
injected into the feed tank. For some plants this also ensures that all the components will be
➠
can mean that all the recovered heat from
condensate cannot be used and often the
only option is to let it drain away.
An innovative heat recovery system
from Spirax Sarco solves this problem by
creating a completely sealed steam system
and transferring the heat from the flash
steam and recovered condensate into
the high pressure side of the boiler feed
pumps. The water entering the boiler can
be raised to well above 100°C without
causing pump cavitation.
The benefit is a significant lowering
of steam-raising costs and an increase in
boiler efficiency. The Spirax Sarco flash
recovery energy management equipment
(FREME) system also recycles all water
through the system, reducing water and
chemical treatment costs.
With concerns about rising energy
costs Abbey Corrugated, the UK’s
leading corrugated board sheet feeder,
commissioned Spirax Sarco to project Fig. 1. The FREME system is supplied as a pre-engineered,
manage the installation of a FREME skid-mounted system.
www.engineerlive.com
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