"DRY" PURIFICATION DEVICE

The fume purification section, which requires that gas be cooled before being treated and so is placed after a heat exchanger, ideally consists of a bag filter unit preceded by a dry neutralization reactor, with a suitable system for storage, grinding and dosage, fed with specific chemical reactants — usually sodium bicarbonate and active carbonates based on the chemical absorption process "Neutrec®" SOLVAY — used first of all to reduce SO2, HCl, HF and more in general the acidic components of the emissions, in addition to heavy metals and complex and organic compositions and chlorine (IPA and dioxins).

An automatic cleaning system (parallel compressed air at 7 bar controlled by a control panel according to programmable cycles and depending on the differential depression before and after the filters) ensures that the chemical absorption and filtration processes are kept stable and effective as well as fumes discharge; the screw feeder at the bottom of the filter and the discharge valve ensure collected dust is discharged as well as materials resulting from the neutralization process.

A final suction device, equipped with a modulating valve with radial sectors, controlled by a system that detects output depression in the afterburner chamber, guarantees that they are discharge regularly, keeping the incinerator at constant depression according to the value set on the control panel.

A flue at the end of the process discharges fumes at a temperature over 130°C (a condition that guarantees the absence of a visible plume) at an exhaust speed of > 15 m/s.