摘要:
A heating module (1) for an exhaust-gas purification system connected to the outlet of an internal combustion engine comprises a catalytic burner, with an HC injector (14) and with an oxidation catalytic converter (12) positioned downstream of the HC injector (14) in the flow direction of the exhaust gas, for supplying thermal energy to an exhaust-gas purification unit of the exhaust-gas purification system. It is provided here that the heating module (1) has a main section (2), a secondary section (3) which comprises the catalytic burner (12, 14), and a device (4, 5) for controlling the exhaust-gas mass flow flowing through the secondary section (3). In a first embodiment, the main section (2) has, in the inlet region of the heating module (1), an overflow pipe portion (6) which has overflow openings (7), between which overflow diverting chambers (8) is simulated, parallel to the main section (2) of the heating module (1), the secondary section portion (11) with the oxidation catalytic converter (12). In another embodiment, it is provided that the secondary section (3) has, at the inlet side and outlet side, in each case one diverting chamber (8) which extends in the radial direction from the main section (2), between which diverting chamber (8) is simulated, parallel to the main section (2) of the heating module (1), the secondary section portion (11) with the oxidation catalytic converter (12).
摘要:
A heating module (1) for an exhaust-gas purification system connected to the outlet of an internal combustion engine comprises a catalytic burner, with an HC injector (14) and with an oxidation catalytic converter (12) positioned downstream of the HC injector (14) in the flow direction of the exhaust gas, for supplying thermal energy to an exhaust-gas purification unit of the exhaust-gas purification system. It is provided here that the heating module (1) has a main section (2), a secondary section (3) which comprises the catalytic burner (12, 14), and a device (4, 5) for controlling the exhaust-gas mass flow flowing through the secondary section (3). In a first embodiment, the main section (2) has, in the inlet region or the heating module (1), an overflow pipe portion (6) which has overflow openings (7), between which overflow diverting chambers (8) is situated, parallel to the main section (2) of the heating module (1), the secondary section portion (11) with the oxidation catalytic converter (12). In another embodiment, it is provided that the secondary section (3) has, at the inlet side and outlet side, in each case one diverting chamber (8) which extends in the radial direction from the main section (2), between which diverting chambers (8) is situated, parallel to the main section (2) of the heating module (1), the secondary section portion (11) with the oxidation catalytic converter (12).
摘要:
The invention relates to a method for feeding thermal energy into an exhaust emission control unit (2) connected in the exhaust gas system of an internal combustion engine by heating the exhaust gas flowing to the exhaust emission control unit (2). Said exhaust gas is heated to a SET temperature. In said method, the exhaust gas discharged from the internal combustion engine is heated to the SET temperature by converting hydrocarbons (HCs) metered into the exhaust gas flow at two oxidation catalytic converters (7, 10) series-connected in the flow direction of the exhaust gas.
摘要:
The invention relates to a method for feeding thermal energy into an exhaust emission control unit (2) connected in The exhaust gas system of an internal combustion engine by heating the exhaust has flowing to the exhaust emission control unit (2). Said exhaust has is heated to a SET temperature by converting hydrocarbons (HCs) metered into the exhaust has flow at two oxidation catalytic Converters (7, 10) series-connected in the flow direction of the exhaust gas.
摘要:
A reducing agent dosing device for delivering a reducing agent into the exhaust gas system 8 of the internal combustion engine 2 of a motor vehicle, comprising a reducing agent tank 3 connected to the exhaust gas system 8 via a supply line 5, 7 with a dosing valve 6 for delivering a specific quantity of reducing agent. The dosing valve 6 is disposed at a distance from the exhaust gas system 8 in the supply line 5, 7 and the output of the dosing valve 6 terminates in a mixing chamber 7. Compressed air, provided by the charge air of a charging group 10 of the internal combustion engine 2, flows though the mixing chamber in the direction toward the exhaust gas system 8 to mix the reducing agent output with an air stream.
摘要:
A device for exhaust-gas purification utilizes reduction of nitrogen oxides which are present in the exhaust gas from internal combustion engines by way of gaseous ammonia with an SCR catalytic converter. The functions of the device are monitored with regard to their line paths with connections, valves and sensors by referring to these elements themselves using suitable control circuitry via the evaluation and control unit.
摘要:
A converter for a device for supplying ammonia (NH3) into the exhaust gas flow of a combustion engine comprising a pressure-tight reaction vessel 2 for generating NH3 by heating a substance thermolytically separating NH3 under the effect of heat, and a heating unit 10 for heating the reaction vessel 2 to the operating temperature for generating the NH3, is defined thereby that the reaction vessel 2 usefully comprises in the region of its bottom an outlet 4 provided with connection means and an inlet 3, spaced apart from the outlet 4, also provided with connection means, with which connection means the interior of the reaction vessel 2 is connectable to a filling and withdrawal unit 13 for drawing off a carrier medium disposed in the reaction vessel 2, and for filling the reaction vessel 2 with new substance thermolytically separating NH3 transported by the carrier medium.
摘要:
An exhaust gas purification system for denoxing exhaust gases has a converter containing a substance thermolytically separable into NH3, a feed line connecting the converter with an exhaust gas line for supplying NH3 into the exhaust gas flow therein, a dosing device in the feed line for dosing the NH3 to be introduced into the exhaust gas flow, a heatable cold-start store connected to the feed line between the converter and dosing device for providing the substance during starting of a combustion unit connected to the exhaust gas line, an air feeding device having two air conduits provided with valves wherein one conduit is connected to the feed line between the cold-start store and dosing device and the other conduit is connected to a mixing chamber located in the feed line after the dosing device, and a reservoir container for storing the substance connected to a filling pipe terminating in the converter.
摘要:
Exhaust gas aftertreatment system, especially for a diesel engine. The invention proposes an exhaust gas aftertreatment system having an exhaust gas particulate filter (3), a nitrogen oxide reduction catalytic converter (7, 8) connected downstream of the exhaust gas particulate filter, and an apparatus (17) for adding reducing agent. As claimed in the invention, the exhaust gas particulate filter (3) is designed as a porous cylindrical filter body having a substantially radial exhaust gas inflow direction into the filter body, a filter inner region (26) for filtered exhaust gas, and an axial exhaust gas outflow direction out of the filter inner region (26), and reducing agent is added into the filter inner region (26) via the apparatus (17) for adding reducing agent. Use in motor vehicles, in particular in commercial vehicles.
摘要:
A filter assembly for an exhaust gas purification system of an internal combustion engine. The filter assembly, has porous filter plate elements, connected with each other on their outer as well as on their inner peripheries, forming in pairs as filter pockets. Catalytic agents such as ammonia are applied to the filter pockets on the outer and/or inner sides to oxidize carbon black contained in the combustion gas. In particular, this filter assembly is compact and can be used for diesel engines of motor vehicles.