Abstract:
Flue gas desulfurization (FGD) is the current state-of-the art
technology used for removing sulfur dioxide (SO2) from the exhaust flue
gases in power plants that burn coal or oil to produce steam for the steam
turbines that drive their electricity generators. Sulfur dioxide is responsible
for acid rain formation. Tall flue gas stacks disperse the emissions by
diluting the pollutants in ambient air and transporting them to other regions.
Sulfur dioxide exhaust should be removed, rather than emitted high
into the atmosphere where it affects many more people. A number of
countries now have regulations limiting the height of flue gas stacks.
As a result of stringent environmental protection regulations
regarding SO2 emissions that have been enacted in a great many countries,
SO2 is now being removed from flue gases by a variety of methods: wet
scrubbing using a slurry of sorbent, usually limestone or lime, to scrub the
gases; spray-dry scrubbing using similar sorbent slurries; dry sorbent
injection systems.
For a typical coal-fired power station, FGD will remove 95 percent or
more of the SO2 in the flue gases.
The goal of this research is represented by the toxic emission of the
combustion plants, resulted from the technologic processes, meaning SO2,
witch overcomes the 400 mg/Nmc values, level imposed by the European
Parliament by Directive 2001/80/EC. If this directive is not respected, then
the large combustion plants from Oltenia area: CET Işalniţa, CET Şimnic
and CET Turceni will be closed.
Thus, was carried out a feasibility study which initial included 12
projects with advantages and disadvantages for the Oltenia area. Following
of evaluation criteria, it was choose the conceptual project on forcing
oxidation bases of wet chalk; the product resulted from desulfurization being
the gypsum (FGD technology).
