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