Energy savings of 35 % achieved by
drive modernization in Chemnitz
Electrical Solutions Reference
Instrumentation, Controls & Electrical
SPPA-E3000 Drive Modernization
is the modernization of drive systems with
frequency converters and energy-efficient
motors. This energy engineering solution
is helping the CHP plant Chemnitz-Nord to
achieve energy and thus cost savings of 35 %.
The Result
■ Lower energy costs for
auxiliaries service thanks
to state-of-the-art drive
technology
■ Reduced maintenance
costs through electronic
speed regulation
■ Short payback time thanks
to efficient technology
The Plant
The Chemnitz-Nord combined heat and power
(CHP) plant is a steam power plant fired using
local lignite. It is operated by eins energie in
sachsen GmbH & Co. KG and comprises three
units with a total electrical output of 220 MVA.
Steam cogeneration supplies the neighboring
households with district heating via a 300 km
long pipeline network and 1400 domestic
connections. The power plant, which commenced operation in 1986, was modernized
between 2006 and 2010.
The Task
In order to improve its own cost structure, the
Stadtwerke Chemnitz utility – now eins energie
in sachsen GmbH & Co. KG – planned the optimization of the power plant's internal energy
balance for unit B. As the largest consumers
of electrical energy, the pump drives were the
focus of attention.
Our Solution
The update with SPPA-E3000 Drive Modernization has enabled the significant reduction
in energy consumption at the CHP plant
Chemnitz-Nord.
Replacing the motors with modern, more
efficient motors significantly improved the
efficiency of the drives for the hot water
circulation pumps and the feed water pump.
A further saving in terms of electrical energy
was achieved by installing frequency converters, as these operate the motors optimally at
their load point.
The infinitely variable regulation of speed and
thus of pump flow rate serves to realize
operation that reduces strain on the plant.
The modernization of the feed water pump
and the associated drive is particularly beneficial due to frequent part-load operation.
Taken as a whole, the modernization of the
drive systems has made a great contribution
to improving the cost base, and has paid for
itself within a short period. In light of the
wholly positive experiences, modernization of
the drive systems is also being performed in
units A and C.
"By employing SPPA-E3000
Drive Modernization and
retrofit measures on the pump,
we have been able to cut the
energy consumption of the hot
water pump drives by 35 %.
At the same time we've
significantly reduced wear-andtear on our plant and thus
maintenance outlay. All in all
it's a satisfactory result for us.“
Silvia Trümper, Manager, CHP Chemnitz-Nord,
eins energie in sachsen GmbH & Co. KG
Answers for energy.
Published by and copyright © 2012:
Siemens AG, Energy Sector
Freyeslebenstrasse 1
91058 Erlangen, Germany
For more information contact
sppa-e3000.energy@siemens.com
www.siemens.com/energy/sppa-e3000
Siemens AG
Fossil Power Generation
Instrumentation, Controls & Electrical
Siemensallee 84
76187 Karlsruhe, Germany
E306_FR_DrMod_Chemnitz_e_V2-0
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The information in this document contains
general descriptions of the technical options
available, which may not apply in all cases.
The required technical options should therefore
be specified in the contract.