The cement market is one of the main international development targets for Area Impianti.
The company’s consolidated experience in the filtration and conditioning of flue gas and its successful track record in large-scale calcining furnaces allow it to rise confidently to the challenges posed by a new sector.
In addition to traditional electrofilters and bag filters, in this sector there are exciting opportunities to use revamping techniques in order to switch from electrofilters to bag filters, as well as the most recent catalytic DeNOx applications.
The treatment of dust-laden flue gas deriving from kiln furnaces and from other sources of pollution typically found in cement works is carried out mostly using dust collectors.
We generally use electrostatic precipitators or bag filters.
Bag filters are more efficient, but they require continuous working temperatures of below 220°C; as such, it is often necessary to subject the flue gas to conditioning.
Alternatively, a heat recovery system can be inserted, which also functions as a cooling stage.
The other pollutants generally processed at cement works are nitrogen oxides.
For limited efficiencies, they can be treated through the injection of urea or ammonia in the area immediately downstream (in the same direction as the flue gas) of the precalciner or the kiln, in an area at around 900°C.
In more modern plants, SCR catalytic systems are utilised. Thanks to Area Impianti’s experience and to the patents it holds, these systems may be installed almost regardless of the temperature.