Grundfos supplies the high pressure multi stage pumps for steam boilers.
It is a leader in pumps for district heating. Gas turbine combined cycle plants
are often replacing coal plants in district heating systems. At the same
time the distribution systems are being upgraded with new pumps
Steam boilers
Grundfos' unique feeding pumps for steam boilers offer unsurpassed efficiency in
a variety of industrial processes. Each multistage pump is capable of feeding
the boiler between 0.5 and 180 m3 water per hour, and the volume is easily
increased by applying more pumps.
Designed to withstand the high pressure, the high media and ambient temperatures
and the significant number of starts and stops encountered in boiler
applications, the pumps have been optimised in every aspect – and are even
capable of efficiently handling poor inlet conditions. The pumps can further be
supplied with an air-cooled top that protects the shaft seal from any damage
caused by high temperatures.
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Challenge |
Solution |
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The very high temperature of hot liquids can be
damaging to the pump and even destroy the shaft
seal. |
Grundfos offers specially designed shaft seals
that handle liquid temperatures up to 180°C,
without external cooling. |
|
The application's inlet conditions are poor. |
A low NPSH Grundfos pump is available,
efficiently reducing NPSH and eliminating
cavitation. |
|
In high-pressure applications like steam
boilers, the pump is subject to demanding
operating conditions. |
Grundfos' dedicated high pressure pumps have
been reinforced to be able to generate up to 50
bar pressure – without reducing the life of the
shaft seal. |
|
Energy consumption is important to your
customer. |
Grundfos' high-efficient E-solutions
significantly reduce energy consumption by
automatically adjusting pump performance to the
actual need. Naturally, the E-solutions meet
international efficiency standards. |
|
Stock management can be difficult due to the
global differences in voltages and frequencies. |
Grundfos' E-solutions feature dual frequency and
a wide voltage range, allowing you to use the
same solution all over the world. Naturally, the
E-solutions carry the necessary approvals. |
|
In continuous operation it is crucial to avoid
pump failure. |
Grundfos has developed a pump monitor, which can
predict pump failure by monitoring different
parameters. Based on the readings the pump's
condition can be assessed. |
|
Unstable pump curves are a common problem in
high-efficiency pumps. |
Grundfos' E-solutions efficiently stabilise the
pump curves, which greatly facilitate reliable
regulations. |
Important notes
The Situation
Göteborg Energi is a wholly owned subsidiary of Göteborg Kommunala Förvaltnings
AB in Gothenburg, Sweden. The company provides district heating, cooling,
natural gas, energy services, an optical fibre network and an electricity supply
network. The Göteborg Energi district heating network extends over a length of
700 km, and provides heating for more than 90% of all the apartment blocks in
Gothenburg.
Göteborg Energi focuses on providing cost-effective heating, and the company
believes in sharing its knowledge with its customers. This is why Göteborg
Energi almost always recommends speed-regulated pumps. In addition to providing
comfort, Grundfos MAGNA solutions provide customers with the most economical
system available.
Many owners of apartment blocks employ specialists in property management and
residential services, such as Riksbyggen in Gothenburg. Over half a million
people live in dwellings managed by Riksbyggen, an all-round service company
specialising in this kind of facility management.
Riksbyggen manages a number of building complexes in Gothenburg, and in many
cases, central control of the heating applications makes it possible to monitor
several buildings at the same time. Whenever a fault shows up, the company sends
someone responsible for that area to solve the problem as quickly as possible.
The Grundfos Solution
When jobs involving renovation work are required, three partiesare often
involved – the customer/owner, the heating provider and sometimes the company
that manages the buildings and properties.
Grundfos plays an important role by supplying equipment for such renovation
projects. “We always recommend speed-regulated pumps,” says Mr. Roger Svensson,
project engineer at Göteborg Energi AB. “In fact, we’ve installed MAGNA pumps in
our own head office. We use this facility to show customers exactly how the
system works and to point out the advantages and benefits of speedregulated
pumps.”
The Outcome
“Riksbyggen installed MAGNA 65-60 speed-regulated pumps in 84 apartments in
Gothenburg, and we can see a great improvement,” says Mr Stig Ljungberg,
operating technician at Riksbyggen. “The low-flow systems now used in new
buildings require precise programming to achieve cost-effective operation,” he
continues. “We’ve been able to achieve this by programming the Grundfos MAGNA
speed-regulated pumps in smaller steps than were previously possible.”