Exhaust gas aftertreatment system

An exhaust gas aftertreatment device for an internal combustion engine, comprising

• an introduction device comprising a burner, a fuel-and-air supply device, a combustion chamber, an exhaust gas line, an injection device for injecting hydrocarbons into the exhaust gas line, and an outlet, wherein
• the injection device is configured to inject a quantity of hydrocarbons that is injected separately from any fuel output by the fuel-and-air supply device,
• the introduction device is configured to at least partially evaporate and chemically modify the hydrocarbons injected from the injection device by at least one of crack reactions and partial oxidation, while suppressing ignition of the injected hydrocarbons,
• the introduction device is configured for joining to an exhaust pipe carrying a process exhaust gas output from an internal combustion engine for introducing the at least partially evaporated and chemically modified hydrocarbons into the process exhaust gas, and
• the introduction device is configured to output the partially evaporated and chemically modified hydrocarbons, via the introduction device outlet, without the partially evaporated and chemically modified hydrocarbons having been reacted by a catalytic coating.

An exhaust gas aftertreatment system for an internal combustion engine, comprising

• an introduction device for introducing hydrocarbons into an exhaust pipe carrying a process exhaust gas output from an internal combustion engine, and
• a treatment device downstream of an outlet of the introduction device, the treatment device configured for the process exhaust gas to flow therethrough and to increase the process exhaust gas temperature by oxidation of hydrocarbons introduced from the introduction device, wherein
• the introduction device comprises a burner, a fuel-and-air supply device, a combustion chamber, an exhaust gas line, an injection device for injecting hydrocarbons into the exhaust gas line, and the outlet that opens into the exhaust pipe,
• the treatment device comprises at least one catalytically coated component, the catalytic coating comprising a platinum fraction that, at least in a part-region of the catalytic coating, amounts to less than 50% of the overall mass of all catalytically active substances in the part-region of the catalytic coating,
• the injection device is configured to inject a quantity of hydrocarbons that is injected separately from any fuel output by the fuel-and-air supply device,
• the introduction device is configured to at least partially evaporate and chemically modify the hydrocarbons injected from the injection device by at least one of crack reactions and partial oxidation, while suppressing ignition of the injected hydrocarbons, and
• the system is configured such that the hydrocarbons partially evaporated and chemically modified by the introduction device first contact a catalytic coating while in the presence of process exhaust gas output from the internal combustion engine.