High Temperature Air Filtration
5
How does a glosfume® hot gas filtration unit work?
Polluted waste gases enter the housing on the
dirty side and are drawn through the special,
hollow “ceramic” filter elements into the clean
side. The filter element structure is so fine that
particles cannot pass through it. Instead, they
lay on the outer surface of the element, while
the filtered, clean gases are discharged to
atmosphere.
In time, on the surface of the filter elements
collected particulates increase in thickness,
this creates a higher differential pressure across
the filter elements. The pressure is recovered
by reverse pulse cleaning, at a pre-set time
compressed air is automatically blown back
through the filter elements to discharge the
collected particles as a filter cake. The removed
material falls to the bottom of the filtration
housing and is removed either manually via a
collecting tray or automatically using a screw
conveyor.
Bag filters or glosfume
®
ceramic filter elements?
Bag filters
●
Poor thermal durability
●
Flammable
●
Not resistant to acid and
alkalis when below dew point.
●
Blind when subjected to high
levels of sub-micron particles
●
Typical maximum operating
temperature 200°C
●
Require heat exchangers, spark
arresters, cyclones, reaction
towers
●
Typical emission 5 to
10mg/m
3
glosfume
®
ceramic filter elements
●
Filter media withstand temperatures
to 1000°C
●
Not flammable
●
Totally resistant to acid and alkalis
above or below the dew point
●
Withstands sub-micron particles
●
Typical maximum operating
temperature 450°C (mild steel
housing).
●
No requirement for cyclones, spark
arresters or reaction towers
●
Emission levels < 3mg/m
3
, typically 1
The efficiency of
glosfume
®
filter elements was measured by French Nuclear Fuels in trials at
various sites. The emission levels recorded were as low as 0.0017 mg/Nm
3
.
Section of a BMF filter
