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Abstract

A plasma method and apparatus for purifying an offgas containing inorganic and organic pollutants. A plasma torch (26) is formed by interaction of the offgas (6) with an electric field (E) created by a voltage (V) applied between one or more couples of electrodes (16) arranged upstream/along a purification chamber (1); the electric field is such that an electric discharge takes place which ionizes the offgas (6) and causes a redistribution of atoms/molecules, thus creating longer molecules, which form a liquid residue (23), and shorter molecules, which form a purified gas (7). The gas undergoes an expansion that is caused by a diverging portion (21) of the purification chamber and assists preliminary cooling of the of fgas/purified gas (6/7). A tube-bundle exchanger (2) is provided and has a cross section larger than the outlet port (14) of the chamber to allow further expansion/cooling. A scrubber (3) is arranged downstream exchanger (2).

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First Claim