US 11,719,147 B2
Exhaust gas after-treatment system of an engine designed as gas engine or dual-fuel engine, engine and method for operating the same
Klaus Strobl, Inchenhofen (DE)
Assigned to MAN ENERGY SOLUTIONS SE, Augsburg (DE)
Filed by MAN Energy Solutions SE, Augsburg (DE)
Filed on Nov. 14, 2022, as Appl. No. 17/986,857.
Claims priority of application No. 102021129852.0 (DE), filed on Nov. 16, 2021.
Prior Publication US 2023/0151753 A1, May 18, 2023
Int. Cl. F01N 13/08 (2010.01); F01N 3/20 (2006.01); F01N 3/24 (2006.01)
CPC F01N 3/2053 (2013.01) [F01N 13/087 (2013.01); F01N 3/24 (2013.01)] 9 Claims
OG exemplary drawing
 
1. An exhaust gas after-treatment system (1) of an engine configured as a gas engine or as a dual-fuel engine, comprising:
a catalyst (3) that can be flowed through by exhaust gas,
a control tube (4) extending through a recess (5) in the catalyst (3), which control tube (4) is movable relative to the catalyst (3) and which can likewise be flowed through by exhaust gas, wherein the control tube (4) at a first axial end portion (4a) carries a first closure body (13) and carries a second closure body (14) at a second axial end portion (4b) that is opposite the first axial end portion (4a),
an actuator (6) configured to move the control tube (4) relative to the catalyst (3) depending on at least one operating condition of the engine and/or on at least one operating condition of the exhaust gas after-treatment system such that:
in a first relative position of the control tube (4) relative to the catalyst (3), the first closure body (13) is axially spaced apart from the catalyst (3) so that the catalyst (3) can be flowed through by exhaust gas but not the control tube (4) and the second closure body (14), seals a gap (15) between the control tube (4) and the catalyst (3), and
in a second relative position of the control tube (4) relative to the catalyst (3) the first closure body (13) axially seals the catalyst (3) and prevents the catalyst (3) from being flowed through by exhaust gas so that the control tube (4) can be flowed through by exhaust gas but not the catalyst (3) and the second closure body (14), is axially spaced apart from the gap (15) between the control tube (4) and the catalyst (3).