TPT May 2009

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45 May 2009
Technology Update
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The inductive heating plant at Rohrwerk
Maxhütte GmbH, supplied by SMS
Elotherm, went into full-scale production
in summer 2008. The order to supply this
facility for the preheating and reheating of
shells had been placed with SMS Elotherm
in summer 2007.
The preheating system comprises a
medium-frequency supply system with
a capacity of 3,600kW at a frequency of
2,000Hz. It feeds two inductors that are
tandem-arranged between the roller tables
ahead of a gas-fired furnace.
After running through the inductive
preheating system, the shells undergo
further heating in the gas-fired furnace. On
this, they are heated over their full length
inside the downstream inductive reheating
system.
Rohrwerk Maxhütte had requested that
the insufficient performance of the gas-
fired furnace be increased while limiting
the temperature load on the furnace during
the process, and that the
temperature differences over
the shell length be eliminated.
There are two systems provided
for inductive reheating, each
equipped with one inductor
having a capacity of 1,800kW
at 1,000Hz. Inductive reheating
ensures an optimal and
equalized temperature over the
full length of the shells.
Profibus facilities connect the
converters with the PLC control
and the visualization system as well as
the entire process. Temperature control of
the plant is implemented via temperature
cameras and speed signals that are issued
by the laser measuring instruments and a
measuring device.
SMS Elotherm’s excellent references in the
field of heating plants markedly contributed
to receipt of the order. The customer had
the opportunity to inspect latest plants and
equipment, for instance the new seamless
tube plant supplied by SMS Meer to
Byelorussian Steel Works (BMZ) in Belarus.
Also in operation at BMZ are inductive
stirring facilities as well as an inductive
heating plant from SMS Elotherm.
SMS Elotherm GmbH – Germany
Fax: +49 2191 891 726
Email:
Website:
Inductive heating plant in operation
at Rohrwerk Maxhütte
 Inductive heating plant with a capacity of 2 x 1,800kW for reheating
shells (Rohrwerk Maxhütte photo)