Air Pollution Control - The Niro Spray Drying Absorption - SDA -
process has, been installed at more than 100 locations.
More
than 25 years ago we developed spray drying for the absorption of acid gases
present in combustion gases. The Niro Spray Drying Absorption - SDA - process
has, since its commercial recognition in the late 1970s, been installed at more
than 100 locations, primarily at coal-fired power generating stations and at
waste incinerators. The technology has, since the early 1980s, found similar
and widespread application in North America and Europe; the process found a
strong foothold in the Far East during the 1990s.
Today, our SDA
process has developed into a mature and highly versatile technology which is
applied at combustion plants ranging from small household waste incinerators to
large coal-fired boilers. The process has also been applied to flue gas
cleaning at industrial plants. This cleaning is often combined with treatment
of effluent or other waste streams.
Flue Gas Desulphurisation -
FGD - uses our SDA process. Flue Gas Desulphurisation is applied to more than
50 coal and oil-fired boilers and power generating stations worldwide. These
FGD plants are built in cooperation between ourselves and international or
local companies. We also work either in joint ventures, as a sub-supplier, or
via licensing of the Niro SDA technology to our business partners. We supply
technical support and essential components to our business partners and
licensees.
FGD plants at coal-fired power generating stations
using our SDA technology may be installed directly after the air pre-heater, so
that the SDA system consisting of one or more spray dryer absorber modules and
downstream particulate collectors remove flue gas, fly ash and sulphur dioxide.
A fly ash pre-collector may be installed in places where it is desired to
separate the fly ash and the scrubber end-product into separate end uses.
The SDA process uses less water than some other FGD processes, and the
process is so flexible that many types of waste water may be used. Treated
sewage water, cooling tower blow-down or other waste waters may be used in the
SDA plants. Even seawater may be used as process water.
Flue Gas
Cleaning - FGC - at Waste Incineration Plants using the our SDA process is
installed at more than 100 waste incineration lines around the world. The
majority of these incinerators are for Municipal Solids Waste - MSW, but the
technology has also been successfully applied to many incinerators for
hazardous chemical waste and several other industrial applications. For Flue
Gas Cleaning waste incineration plants, we provide technology directly to the
end user, although many plants are commissioned with ourselves as a supplier of
know-how with key components delivered to an international or local supplier.
Flue Gas Cleaning plants at waste incinerators which apply the SDA
process, are most often designed to control the stack emissions of a multitude
of harmful components such as:
- hydrogen chloride
- sulfur dioxide
- hydrogen fluoride
- fly ash
- dioxins
- mercury
- other heavy metals