Particulate separator, in particular particulate filter for separating particulates from an exhaust gas flow of a combustion engine

Abstract

The particle separator (1) has different heat transfer areas (a,b) in terms of heat storage capacity or heat conductivity or heat transfer characteristics of exhaust gas flows (3,12,13) along the mainflow direction (x) of the exhaust gas flow through the particle separator. A defined heat quantity is transferred from the exhaust gas flows (3,12,13) over the respective assigned particle separatorsection.

Description

technical field [0001] The invention relates to a particle separator (Partikelabscheider), in particular a particle filter (Partikelfilter), for separating particles from an exhaust gas flow (Abgastrom) of an internal combustion engine (Brennkraftmaschine) according to the preamble of claim 1 . Background technique [0002] A particle separator according to the invention is, on the one hand, a particle separator whose flow channel diameter is significantly larger than the diameter of the largest exhaust gas particle present. On the other hand, it is also commonly referred to as a particulate separator, whose flow channel diameter is within the particle diameter range of the exhaust gas flow, and / or in which the exhaust gas flow flows through a filter medium. Due to this difference, the particulate filter is at risk of clogging, which increases the exhaust back pressure and reduces the engine power (motorleistung) as the amount of separated soot increases. A known possibilit...

AI Technical Summary

Problems solved by technology

The disadvantage of this method is that the nitrogen dioxide formed on the particle filter can only oxidize the particles separated downstream of the catalytically active layer for nitrogen monoxide oxidation, i.e. within the filter medium

But these high-temperature materials are difficult to machine, very expensive, and weigh more than commonly used materials

Another disadvantage of these refractory materials is that their heat capacity is usually higher than that of, for example, cordierite

This causes temperature peaks because the thermal storage capacity taller and flattened

This is especially detrimental for active filter regeneration, as more heat must be supplied to High cushioning action of the filter substrate reaches the ignition point at the filter inlet

Images