High Temperature Air Filtration
8
glosfume
®
and dry scrubbing –
a perfect partnership
Emissions may contain acid gases such as HCl, HF, SO
2
and dioxins. Pollutants can be neutralized
by scrubbing, using sodium bicarbonate or lime and activated carbon.
The disadvantages of conventional
bag filter systems
Where lime is normally used as the scrubbing medium it must be maintained in a temperature
range of 100 to 130°C. At higher temperatures consumption increases and efficiency falls.
If sodium bicarbonate is used, the operating temperature must be maintained between 140 and
200°C. At 200°C there is a risk that the filter bags will catch fire.
Finally, bag filters must operate at lower gas velocities and therefore require the addition of
costly reaction towers and recycle lines to achieve efficient dry scrubbing.
The advantages of using sodium bicarbonate
with glosfume
®
filters
Sodium bicarbonate remains fully active with no variation in consumption between 140 and
450°C. To ensure optimum efficiency and the fullest use of the sodium bicarbonate, each
complete
glosfume
®
filter unit has been carefully modelled using computational fluid dynamics
(CFD) to plot the pattern of particulate retention positions. CFD design also helps to ensure that
pollutants are uniformly presented over the whole of each filter element and that the absorbent
is drawn onto the elements where the reaction takes place.
All
glosfume
®
filters are designed to function efficiently and reliably over the important range of
between 140 and 450°C.
A one-tonne big bag feeder injects absorbent
Injection point of absorbent
