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Dry process
The dry process involves not only filtration but also the injection
of a suitable reagent in powder form into the gas stream to be scrubbed.
Acid pollutants are captured by adsorption on particles of alkaline
reagent. Additional coke or activated carbon is injected to adsorb
dioxins and furans, as well as numerous other residual pollutants,
in particular certain gaseous heavy metals such as mercury.
Cooling the flue gases to a low temperature improves the dry process
by allowing a wider choice of reagents and/or reducing reagent consumption.
This low temperature dry process uses a water cooling tower or an
exchanger / air recovery unit specially designed to avoid any risk
of corrosion.
No water is used or discharged and the stack plume is almost non-existent.
Reagent injection reactor
This reactor is crucial to optimize diffusion and reagent residence
time in the flue gas before entering the filter.
Electrostatic filter, horizontal or vertical fabric filter
These filters separate particles (ash, excess reagents and reaction products) from the flue gas. Fabric filters optimize the capture of gaseous pollutants by adsorption on the filter cake which forms on the fabric. The filter medium is selected depending on the operating conditions to ensure good filter performance and service life.
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Activities
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