Doosan - Vado e Torno Edizioni

The manufacturer’s
responses are
also clear: on
construction sites
too there is the
need for devices
that will capture
the graphitic
combustion
residues, just as
it happens
‘on the road’.
Filtering soot before the Final
APPROACHING
ZERO
TOLERANCE
It is now clear that also in construction the particulate fi ltration will be
present on machinery and on genset on building sites. The approach for
regeneration is active. The tendency is to focus on the Dpf and Scr pair
as a global solution. These are the sector’s protagonists
Just prior to the Tier4 Final
it has become clear: starting
from the first January 2014
those who will produce engines
with 0.02 g/kWh exhaust
of particulate will be allowed
on both the American and European
market. The manufacturer’s
responses are also clear:
on construction sites too there
is the need for devices that will
capture the graphitic combustion
residues, just as it happens
‘on the road’. Amongst the
off-road applications, the most
common systems are those that
trigger regeneration through
engine glow plugs, burners or
pre or post-oil injection. Some
of the Dpf manufacturers have
redeemed from this approach,
like Hjs, that could present at
Bauma the upgrade of its Crt
technology (Continuously regenerating
trap).
Another common tendency
amongst the manufacturers is
the integration of Dpf and Scr,
that had already been shown
at the Samoter two years ago.
The integrated retrofit (named
‘Scrt’) actually enables to attack
both fine particles and nitrogen
oxides upon exhaustion.
Baumot
The Swiss specialist has adopted
aggressive policies for the
heavy automotive, especially
for buses, taking over Twintec
and Interkat (strategic synergy
for the development of Dpf-
Doc-Scr integrated systems),
and re-launches on the off-road.
There are two ‘active’ versions:
the Ba-F uses a burner,
the Ba-H a coil, while the Ba-A
uses the organometallic additive
and is applied to fuels with
sulphur levels above 350 ppm.
Dinex
In Denmark, the whole production
process has been implemented
in house. The DiPex
is a cordierite filter, permeated
with rare-earth elements, and
an alveolar structure; the Di-
Sic, on the other hand, is compatible
with fuels with sulphur
levels of 50 ppm and uses the
Fbc(fuel born catalysed). A
post-combustion triggers the
regeneration and is suitable
for applications such as wheel
loaders and all the machinery
that works at low loads. Dinex
too is focusing on the filter
and post-treatment pair: with a
patented lining implementing
thermal insulation.
Eminox
The British firm from Gainsborough
is one of the European
brands for anti-pollution devices
and uses Fbc as well as Crt
and Scr for NOx and catalysts.
The Art (Active regeneration
trap) abbreviation identifies the
Eminox system for low tempe-
To the left, Hjs.
Down, from left
to right, the swiss
Baumot and the
italian one, Pirelli
Eco Technology.
Up, another italian
player, Bersy. In
the middle of
the page, Dinex.
On the left, after
Bersy, Puritech. On
the top, the other
swiss, Hug, and
an application.
ratures. In the catalogue we also
find the Scrt system, that has
been tested on London buses.
Hjs
Germans are experts on Crt and
will probably deliver an important
message in Monaco. Full
range for Hjs, that uses the Scr,
also coupled with Dpf. The
Cb2 (Catalytic bypass burner)
system was conceived for engines
with two-stage supercharge.
The system downstream to the
turbo, between the rotor and the
filtrating unit, comprises two
catalysts and a burner.
For ‘lazy’ applications the Ar
(Active regeneration) formula
is also available: a coil receives
the signals of back pressure
sent by the control unit.
Hug
There is rumour that in Elsau,
in Switzerland, the prospective
of Euro 6 under discussion. For
now, the Mobiclean R is available
in four versions: Basic,
Advanced, Electro and Flame.
The latter uses a burner for
pre-injections (it works at low
speeds on applications such as
cement mixers and compactors),
and the Electro has a resistor
for regeneration with the
engine swithed off (for example
on fork lifts). The systems for
post-treatment with urea were
initially been developed by Hug
on stationary machinery.
Pirelli Eco Technology
The Feelpure is a ceramic extrusion
with alveolar structure,
that utilises an orgometallic catalyst.
The Ar (Aided regeneration)
version uses four or six
glow plugs, for low work load
applications. The Feelpure is
also available in the Platinum
version, permeated with precious
metals, therefore without
additive, and Downox, which
combines Scr and Dpf. Pirelli
has just started a joint venture
(Eco emission enterprise) with
the American industrial giant
for Cdti catalysts.
Puritech
Within the German portfolio,
the Dpf family of beehive filters
with constant regeneration
through catalytic lining, designed
for medium loads, is divided
into two classes that differ
with the addition of a pre-filter
on the Dpf-2. The Dbs/Das series
use both spontaneous and
additive-mediated regeneration
and the oil-injection in the prefilter
variation, when it is required
by back pressure.
Fabio Butturi
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