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ReCyclone® System

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Uploaded on Jul 7, 2010

ReCyclones are the most efficient cyclone systems worldwide for particulate matter emisson control and powder recovery from gas streams.

A Mechanical ReCyclone (ReCyclone MH) is made up of a Hurricane (high efficiency cyclone) with a particle separator (straightthrough cyclone), placed downstream of the cyclone -- called the "recirculator".

The main purpose of the recirculator is to reintroduce the fine uncaptured
particles into the cyclone after they have been driven to the outer walls of the recirculator by centrifugal forces. While this tangential gas stream
is enriched in particles, the axial gas stream exhaust to the stack is
practically invisible.
Recirculation is achieved through an additional fan or a venturi.

Since the recirculation system only serves the purpose of dust concentration,
the particles are exclusively collected in the cyclone and the need for moving parts is thus avoided.

Efficiency increases due to recirculation and agglomeration of very small particles with larger ones coming directly from the process. A
ReCyclone MH decreases emissions of best cyclones in the market by 75%.

As other cyclone systems, ReCyclones MH are very robust, do
not have temperature limitations and do not have moving parts which
need to be frequently changed.

ReCyclone EH -
Finally, recent adoption of electrostatic recirculation in the same cyclone
system has successfully proven to further reduce particle emissions,
even in the [1;5] μm particle size range, assuring future regulation
compliance, particularly where legal limits are very tight, with the objective
of bag filter redundancy.

A dc high voltage is applied to the concentrator, allowing the recirculation
of very fine nanometric particles, more resistant to centrifugal forces, to the cyclone collector.

After having been separated in the recirculator and concentrated
in the recirculation flow, electrically charged fine particles are attracted
by the cyclone walls, while agglomerating with larger particles entering
the system -- both promoting their
easier capture.

Since particles are not captured on the walls of the recirculator, contrary
to ESPs, ReCyclones EH are immune to either low or high dust electrical resistivity and the HV required power is only 10 to 15 % of
that used in ESPs.

Electrostatic reciculation for fine particle capture was the winner
of the Portuguese Environmental Press Award in 2008 and Nominee
for the European Environmental Press Award 2008.

Applications include particulate matter (PM) emission control in boilers and furnaces and powder recovery
in the pharmaceutical, food and chemical industries.

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