Abstract: The present invention relates to a catalytic article for purifying an exhaust gas containing nitrogen oxides, which comprises a first region containing a vanadium-based SCR catalyst, a second region containing a metal-promoted molecular sieve catalyst, and a third region containing a vanadium-based SCR catalyst, wherein at least part of the second region is located downstream of at least part of the first region and upstream of at least part of the third region in the exhaust gas flow direction, provided that no part of the second region is located upstream of the first region or downstream of the third region. The present invention also relates to a method and a system for treatment of an exhaust gas containing nitrogen oxides by selective catalytic reduction using the catalytic article.

Abstract: A radar antenna device (16) having an antenna arrangement (19) that is accommodated in a housing (17) and is provided with a protective plate (20) for being separated with respect to a furnace atmosphere formed within a furnace chamber, said protective plate (20) being disposed on the housing, a radar-transparent limp material layer (21) comprising pores being disposed as a shield at a distance upstream of the protective plate (20) in such a manner that a space which is separated by the material layer (21) with respect to the furnace chamber is formed, a fluid line opening into said space for applying a fluid flow to the material layer (21).

Abstract: A device for determining the topography of the burden surface in a shaft furnace (10), the device comprising a radar device (20) that scans the burden surface (18) and has an antenna device (22) arranged in the area of a furnace cover (13), the antenna device being arranged on an axis of rotation (24) that is inclined in relation to a vertical axis (15) of the shaft furnace at an angle of inclination ? and being rotatable about the axis of rotation by means of a drive device in such a manner that a radar fan beam (28) formed by the emitted radar radiation of the antenna device is incident upon the burden surface along a profile line p and sweeps across the burden surface as the antenna device rotates.

Abstract: A radar antenna device (16) having an antenna arrangement (19) that is accommodated in a housing (17) and is provided with a protective plate (20) for being separated with respect to a furnace atmosphere formed within a furnace chamber, said protective plate (20) being disposed on the housing, a radar-transparent limp material layer (21) comprising pores being disposed as a shield at a distance upstream of the protective plate (20) in such a manner that a space which is separated by the material layer (21) with respect to the furnace chamber is formed, a fluid line opening into said space for applying a fluid flow to the material layer (21).

Abstract: The invention relates to a device for determining the topography of the burden surface in a shaft furnace (10), the device comprising a radar device (20) that scans the burden surface (18) and has an antenna device (22) arranged in the area of a furnace cover (13), the antenna device being arranged on an axis of rotation (24) that is inclined in relation to a vertical axis (15) of the shaft furnace at an angle of inclination a and being rotatable about the axis of rotation by means of a drive device in such a manner that a radar fan beam (28) formed by the emitted radar radiation of the antenna device is incident upon the burden surface along a profile line p and sweeps across the burden surface as the antenna device rotates.