Process and installation for recovery and/or purification of dinitrogen oxide contained in an exhaust gas

摘要

The device includes means (4, 5, 6) of passively drying the air by generating an icing phenomenon. These means have at least one air passage in the form of a chicane which remains free during the icing phenomenon. The means of passive drying are means of static drying of the air and include at least two perforated plates (5, 6) separated from each other by the air passage (4). The device has a corridor (7) in which at least two of the perforated plates are offset so the air circulating in the corridor partly passes through one of the perforated plates and partly passes between the plates through the passage. The perforated plates are perpendicular to the walls of the corridor. The size of each perforated plate occupies around three quarters of the size of the corridor and the interplate space occupies one quarter, approximately 100 mm. The perforation rate in the perforated plates is between 30 and 50 %. The perforated plates are flat and are metallic meshes. Mechanical protective chassis for an air filter containing an anti-icing device as described at its air inlet. Ventilation system containing an anti-icing device as described or a chassis as above and the pressure drop ( DELTA Pd) at the anti-icing device level is greater than or equal to the pressure drop ( DELTA Pf) at the filter level.