Producing ageing gas for exhaust gas after-treatment systems

Abstract

The invention relates to a process of producing ageing gas for ageing components for the after-treatment of exhaust gas in a burner which comprises a combustion chamber with at least one fuel injection nozzle and with a combustion gas supply system with means for generating swirl, wherein the swirl of the combustion air is set as a function of the selected combustion air ratio λ.

Description

FIELD OF THE INVENTION

[0001] The present invention is related to a process for producing ageing gas, and in particular for producing ageing gas for ageing components related to an after-treatment of exhaust gas.BACKGROUND OF THE INVENTION

[0002] Motor vehicles with internal combustion engines are subject to emission laws which, nowadays, can only be complied with by using exhaust gas after-treatment systems which adjoin, and are connected to, the internal combustion engines in the exhaust gas line. The exhaust gas after-treatment systems have to have the service life which is specified by law. For the European Union, after the introduction of exhaust gas stage EURO 4, there is specified a durability in the form of a minimum driving performance of 100,000 km, whereas after the introduction of exhaust gas stage EURO 5, a durability in the form of a minimum driving performance of 160,000 km has been specified. For homologizing a vehicle (type approval), it is necessary to prove permanent ...

Examples

Embodiment Construction

[0068]FIG. 1 shows an inventive burner 10 with a combustion chamber 11, which burner 10 comprises an outer rotationally symmetric burner sheath 12 which extends between an entry flange 1 and an exit flange 14 and comprises three length portions 16, 17, 18 whose diameter decreases from the entry flange to the exit flange and which are connected to one another via conical transition portions 19, 20. A carrier flange 15 which comprises an outer collar and an inner annular projection to be described in greater detail with reference to the following Figures is threaded to the entry flange 13. The collar centres the entry flange 13 to which there is attached the burner sheath 12. On its outside, the inner annular projection at the carrier flange 15 carries a mixing pipe 21 for returning conditioned ageing gas and extends, at a radial distance, along the length of the first two portions 16, 17 of the burner sheath 12 and of the two conical transition portions 19, 20. From the transition po...

FIELD OF THE INVENTION

[0001] The present invention is related to a process for producing ageing gas, and in particular for producing ageing gas for ageing components related to an after-treatment of exhaust gas.BACKGROUND OF THE INVENTION

[0002] Motor vehicles with internal combustion engines are subject to emission laws which, nowadays, can only be complied with by using exhaust gas after-treatment systems which adjoin, and are connected to, the internal combustion engines in the exhaust gas line. The exhaust gas after-treatment systems have to have the service life which is specified by law. For the European Union, after the introduction of exhaust gas stage EURO 4, there is specified a durability in the form of a minimum driving performance of 100,000 km, whereas after the introduction of exhaust gas stage EURO 5, a durability in the form of a minimum driving performance of 160,000 km has been specified. For homologizing a vehicle (type approval), it is necessary to prove permanent ...

Examples

Embodiment Construction

[0068]FIG. 1 shows an inventive burner 10 with a combustion chamber 11, which burner 10 comprises an outer rotationally symmetric burner sheath 12 which extends between an entry flange 1 and an exit flange 14 and comprises three length portions 16, 17, 18 whose diameter decreases from the entry flange to the exit flange and which are connected to one another via conical transition portions 19, 20. A carrier flange 15 which comprises an outer collar and an inner annular projection to be described in greater detail with reference to the following Figures is threaded to the entry flange 13. The collar centres the entry flange 13 to which there is attached the burner sheath 12. On its outside, the inner annular projection at the carrier flange 15 carries a mixing pipe 21 for returning conditioned ageing gas and extends, at a radial distance, along the length of the first two portions 16, 17 of the burner sheath 12 and of the two conical transition portions 19, 20. From the transition po...

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