Influence of the natural aluminium oxide layer on ... - ALU-WEB.DE

Abbildungen: promeos
Resource efficiency at increased process quality
becomes <strong>the</strong> dominating driver for investments
in industry, and so in <strong>the</strong> world <strong>of</strong> casting.
An optimized melting and material logis-
tics process requires optimum temperature
control <strong>of</strong> material and casting equipment, including
melting furnace, transportation ladles
or launders and casting moulds.
MELTING, RECYCLING & HEAT TREATMENT
New standards in gas-fired heating <strong>of</strong> moulds, ladles, launders
and melting furnaces through flameless burner technology
Jochen Volkert, promeos GmbH
Fig.1: Porous burner
Fig. 2: Different designs <strong>of</strong> <strong>the</strong> porous burner
Based on its flameless high performance industry
burner portfolio, promeos <strong>of</strong>fers new
preheating and tempering solutions all along
<strong>the</strong> process line. Energy savings <strong>of</strong> up to 75%
and increased process stability due to enhanced
control measures have been approved
at numerous foundries all across <strong>the</strong> metal
processing market.
The clou is as easy as impressing: <strong>the</strong>
absence <strong>of</strong> a free flame as spot-type heating
source and <strong>the</strong> infinitely adjustable heat flux
(similar to a dimming lamp) are core features
to avoid inhomogeneity and inefficiency in
heating ladles, launders or moulds.
Porous burner technology
In a porous burner (Fig. 1) <strong>the</strong> combustion takes
place in a porous high temperature ceramic,
<strong>the</strong> combustion reactor, instead <strong>of</strong> in an open
flame. This results in a flameless, volumetric
combustion in <strong>the</strong> form <strong>of</strong> glowing ceramic
foam which can be used as a radiating surface
as well as a homogenous source <strong>of</strong> heat. Any
shapes are possible such as round or square
burners, lines, cylinders, rings, rhombuses and
o<strong>the</strong>r specially tailored shapes (Fig. 2).
Special applications require special solutions,
for example line shaped burner heads
Table 1: Heating systems for casting moulds: benefits / value proposition
which concentrate <strong>the</strong> heat from convection
and radiation exactly where it is needed.
The length <strong>of</strong> a reactor can thus be extended
if desired. Dimensions <strong>of</strong> several meters in
length with a reactor width from 15 to 200 mm
allow specific burning performances from 2
to 600 kW/m in length.
Based on <strong>the</strong> unique features <strong>of</strong> <strong>the</strong> flameless
porous burner combustion technology,
promeos develops and manufactures tailored
heating systems for process applications.
Furnace engineering is required for both
process technology and manufacturing to ensure
optimum product quality. The outstanding
design features <strong>of</strong> promeos burners and its
ease <strong>of</strong> integration into any kind <strong>of</strong> apparatus
allow <strong>the</strong> heat to be distributed over / into <strong>the</strong>
required area / volume and applied where <strong>the</strong>
process needs it, as opposed to being directed
to only one spot. promeos supplies ‘tailor
made suits’ for your individual needs, powerful
and efficient.
The unique combination <strong>of</strong> features like <strong>the</strong>
power density, a rapid and precise power adjustment
(similar to electric heating devices),
a homogeneous heat flux and its compact and
modular design result in <strong>the</strong> following benefits:
• enhanced quality <strong>of</strong> your products
+ reduced preheating times The high energy density and heat transfer via
infrared radiation and controlled convention allow
an unmatched quick heating <strong>of</strong> <strong>the</strong> moulds.
Generally <strong>the</strong> preheating times are cut down
50% and more.
+ homogeneous temperature distribution So called ‘hot spots’ that are due to local fire or
flames are completely eliminated because <strong>of</strong> <strong>the</strong>
homogeneity <strong>of</strong> <strong>the</strong> heat input. In combination
with <strong>the</strong> continuously variable power control <strong>of</strong>
<strong>the</strong> burners <strong>the</strong> preheating <strong>of</strong> <strong>the</strong> mould can be
controlled optimally.
+ production time Production time is gained due to <strong>the</strong> shortened
heating-up time and corresponding process control.
+ less scrap production The ideal preheating <strong>of</strong> <strong>the</strong> mould reduces <strong>the</strong>
number <strong>of</strong> required ‘warm castings’ – waste reduction
is <strong>the</strong> consequence.
+ durability <strong>of</strong> <strong>the</strong> tools The homogeneous temperature distribution reduces
<strong>the</strong>rmal stress and <strong>the</strong>reby automatically
increases <strong>the</strong> lifetime <strong>of</strong> <strong>the</strong> tools.
Σ ROI < 24 months, guaranteed
< 12 months, mostly
Usually your investment is recovered within a
period <strong>of</strong> max. 12 months. We will compile you
with a detailed amortization calculation with
every <strong>of</strong>fer you receive from us.
ALUMINIUM · EAC CONGRESS 2011 63