System for introducing a hazardous substance reduction medium into the exhaust air

Abstract

The invention relates to a system (110) for introducing a pollution-reducing medium, especially a reducing agent (120) and / or a reducing agent precursor, into an exhaust gas flow. The system (110) comprises at least one reservoir (111) for accommodating a stock in the pollution-reducing medium. Said reservoir (111) comprises at least one flexible storage bag (112), especially a plastic bag, for accommodating the pollution-reducing medium. The flexible storage bag (112) has at least one flexible film wall (114) and preferably at least one withdrawal opening (116).

Description

Background technique [0001] The invention originates from known methods and devices for aftertreatment of exhaust gases, in particular of internal combustion engines. Techniques are known in which a pollutant reducing medium, in particular a fluid medium such as a liquid or a gas, is dosed, for example injected, into the exhaust gas. An important example is the injection of urea water solution (HWL) into the exhaust pipe of a diesel engine in a passenger vehicle or a truck in order to reduce the content of nitrogen oxides (NOx) in the exhaust gas, but the present invention does not limited to this example. Here, NOx is reduced with the formation of nitrogen and water in the reduction reaction. This type of method is also commonly referred to as an SCR method (SCR: selective catalytic reduction, selective catalytic reduction). An example of an aqueous urea solution as reducing agent is available, for example, under the trade name "AdBlue". The actual reducing agent, ie gase...

AI Technical Summary

Problems solved by technology

However, a design of this type, which is feasible in principle, is relatively complex in practice and in some cases requires considerable installation space, which can adversely affect the maximum filling volume of the tank system

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