Page 62 - Industrial Plant 2015
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Fig. 4 - Spig environmentally friendly air cooled condenser transfer coefficient unchanged during the lifetime of
the plant.
ACC testing
The ACC was subjected to thermal performance, noise
testing criteria and electrical consumption validation
and was totally successful in meeting the strict technical
contractual requirements (figure 5). The official
performance test was carried out with Unico, Spig
Online monitoring System, in remote mode.
After the final commissioning completed in September
2013, with the aim to demonstrate the full compliance
to the contractual guarantees, Spig and Ansaldo
Energia arranged an intensive ACC performance test
plan between December 2013 and February 2014. The
tests were executed according to VGB-R 131
international standard. All the critical parameters of the
ACC were monitored through the Unico System, the
new generation wireless data logging developed by
Spig’s laboratories specifically for dry and wet cooling
applications.
The ACC was tested under several operating
conditions, different steam loads, turbine by-pass and
Spig supplied the cooling system
complete with single row tube bundles,
steam ducts, piping, structural steel,
vacuum systems and all integral
components of the entire system
Fig. 5 – ACC testing The design of the environmentally friendly Spig ACC shut-downs. The ACC was indeed able to successfully
consists of six parallel roofs, each one completed by keep the expected turbine back-pressure and deliver a
seven cells using the state-of-the-art single row reliable performance in a wide range of ambient
aluminium flat steel tubes with brazed aluminium conditions.
corrugated fins, built on an overall 94 × 79 (m × m) During the same period an extended investigation on
footprint (figure 4). This technology offers better the ACC noise emissions was also carried out by Spig
thermal performance, lower power consumption, and Ansaldo Energia technical specialists. Both
higher reliability and a smaller plot area when mechanical equipment and main steam duct noise
compared to the commonly used multi row technology. emissions were checked by means of electronic noise
Spig supplied the cooling system complete with analyzers.
single row tube bundles, steam ducts, piping, The challenging contractual ACC noise limitations were
structural steel, vacuum systems and all integral successfully matched at the design operating
components of the entire system. The condenser conditions. Finally, the ACC was certified by the power
has been supplied with a semi-automatic tube plant end user as ready for commercial operations.
bundles cleaning system, consisting of high pressure
spray water suitable to clean up the tube bundles A unique online monitoring
outside surface. This system is aimed to keep them system
free of any deposit and maintaining the overall heat
Unico Spig continuous online monitoring system has
been designed to improve plant efficiency by processing
Industrial Plants - May 2015
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