DEVICE FOR REMOVING SOLID PARTICLES FROM EXHAUST GASES, DESIGN OF A UNIT FOR NEUTRALISING HARMFUL WASTE GASES AND A METHOD OF MANUFACTURING SAID UNIT

摘要

The proposed device for removing solid particles from exhaust gases comprises: a rotating combustion chamber (1) and a vortex generator (2) and soot collector (3) separated by an intermediate cavity (7) and situated along the same axis in the direction of the gas flow. A catalytic unit (4) for neutralising harmful waste gases is mounted coaxially inside the soot collector (3). The device has an inlet nozzle (8) and an outlet nozzle (9). The vortex generator is designed as an impeller. The unit (4) for neutralising the harmful waste gases is designed as a cylindrical housing (5) containing longitudinal channels (6) to which on the inside an active catalytic layer is applied. The longitudinal channels (6) in cross section have a curved and closed profile, while the catalytically active layer has the same thickness over the entire internal surface of the longitudinal channels and throughout the section and length of the unit (4). The proposed method of manufacturing the unit (4) is based on the creation of a catalytically active layer based on modified aluminium oxide on the surface of a carrier. The catalytic layer is applied by plasma spray-coating of a flat metallic strip carrier. Catalytically inactive substances are used as base material for the plasma spray-coating. The longitudinal channels (6) are created by corrugation of the carrier across its length after spray-coating of the catalytically active layer. Tape is wound parallel to the corrugations, with the catalytically active layer inside the channels (6). The plasma-forming gas used for the spray-coating is air or another oxygen-containing mixture.