In order to provide a flow device which is of simple construction and is operable reliably and in an energy-efficient manner, it is proposed that the flow device comprise the following: a plurality of flow segments which each comprise one or more flow bodies and through which a stream of raw gas is arranged to flow for removing impurities in a cleaning mode, wherein the stream of raw gas is arranged to be supplied to the flow segments via a raw gas supply system and wherein a stream of clean gas that has been cleaned by means of the flow segments is removable from the flow segments by means of a clean gas removal system; a regeneration device for regenerating the flow segments, wherein the regeneration device comprises a docking device for establishing a temporary connection between one or more flow segments that are to be regenerated on the one hand and a heating device and/or a flushing device of the regeneration device on the other hand.

The invention relates to an exhaust gas purification system applied to an internal combustion engine. The engine has a turbocharger including a turbine wheel and a housing for housing the turbine wheel. The housing defines a turbine outlet passage communicating with an exhaust gas discharging part of the turbine wheel. The engine further has an exhaust passage part communicating with an exhaust gas outlet of the turbine outlet passage. The system comprises an exhaust gas purification apparatus disposed in the exhaust passage part at a position adjacent to the exhaust gas outlet of the turbine outlet passage. Further, the apparatus includes an exhaust gas purification member. The member is provided such that its density in a peripheral part of the exhaust passage part is larger than that in a central part of the exhaust passage part and a flow passage resistance per unit volume of the member at an area of the central part of the exhaust passage part is smaller than that at an area of the peripheral part of the exhaust passage part.

A holding material includes a stack of a first mat and a second mat, the first mat including alumina fibers that include 60 wt % or more of alumina and 40 wt % or less of silica, and the second mat including silica fibers that include 60 wt % or more of silica and 40 wt % or less of alumina and having a surface pressure higher than that of the first mat as measured at a gap bulk density of 0.30 g/cm.sup.3.

A device to trap and remove particulate matter from exhaust of internal combustion engines, without increasing resistance to the flow of engine exhaust is disclosed herein. The system is provided with a single or a plurality of ducts (1 & 2) through which exhaust gases enter tangentially into a hollow chamber (3), causing the gases to spin at high speeds. The spinning gases generate centrifugal force resulting in separation of particulate matter from the exhaust gases. The hollow chamber (3) contains ports (4) and radial projections (5) on its axial surface to allow the separated particulate matter to enter into a trap (6). The particulate matter entering the trap (6) gets stuck to a fine mesh of high temperature resistant porous material that may or may not be electrically charged. The trap (6) is enclosed in a cover (7) that encases the fine mesh which surrounds the ports (4) and radial projections (5). The cover (7) has a single or plurality of ducts (8) connecting the trap (6) to the low pressure area of the rotating gases in the hollow chamber (3) through the port (9) provided at the proximal end of the hollow chamber (3).

An Exhaust Aftertreatment System (EATS) arrangement includes a housing, a pre-SCR insert, a PF insert, a first main SCR insert and an exhaust pipe. The pre-SCR insert, the PF insert and the first main SCR insert are arranged in the housing and are each removably mounted in the housing such that each insert may be removed separately from the housing, the pre-SCR insert being mounted along a first geometric axis, the PF insert being mounted along a second geometric axis and the first main SCR insert is mounted along a third geometric axis, the first geometric axis being parallel with the second geometric axis and the third geometric axis is parallel with the first and the second geometric axes or coincides with either one of the first and the second geometric axis and is parallel with the other one of the first and the second geometric axis.

A heat-resistant body has a cavity for exhaust gas, which is open at opposite ends. The body has first wall portions, each of which delimits a first portion of the cavity. Each first wall portion has an outer region and an inner region which has planar protrusions which each extend from the outside region inward into the associated first cavity portion, the planar protrusions tapering along the longitudinal extent in their width directed perpendicularly to the longitudinal extent and being mutually laterally spaced. Each planar protrusion of a first wall portion is rotated or shifted relative to a planar protrusion of an adjacent first wall portion. The body has second wall portions, each of which delimits a second portion of the cavity and is disposed between two adjacent first wall portions. The cross-sectional area of each second cavity portion is larger than the cross-sectional area of each first cavity portion.

A holding material includes a stack of a first mat and a second mat, the first mat including alumina fibers that include 60 wt % or more of alumina and 40 wt % or less of silica, and the second mat including silica fibers that include 60 wt % or more of silica and 40 wt % or less of alumina and having a surface pressure higher than that of the first mat as measured at a gap bulk density of 0.30 g/cm.sup.3.

The invention relates to an exhaust gas purification system applied to an internal combustion engine. The engine has a turbocharger including a turbine wheel and a housing for housing the turbine wheel. The housing defines a turbine outlet passage communicating with an exhaust gas discharging part of the turbine wheel. The engine further has an exhaust passage part communicating with an exhaust gas outlet of the turbine outlet passage. The system comprises an exhaust gas purification apparatus disposed in the exhaust passage part at a position adjacent to the exhaust gas outlet of the turbine outlet passage. Further, the apparatus includes an exhaust gas purification member. The member is provided such that its density in a peripheral part of the exhaust passage part is larger than that in a central part of the exhaust passage part and a flow passage resistance per unit volume of the member at an area of the central part of the exhaust passage part is smaller than that at an area of the peripheral part of the exhaust passage part.

A particle filter (2) for filtering exhaust gas in an internal combustion engine includes a housing and a filter element. A simplified installation and/or simplified replacement of the filter element (5) and/or improved sealing of the housing (4) results if the filter element (5) is supported in an inner jacket (9), which is supported radially in an outer jacket (12) and is arranged so as to be axially movable in the outer jacket (12). The inner jacket (9) is axially supported on a ring (24), which is supported axially on a cover (22) that closes an installation opening (20) of the housing (4) via at least one supporting element (25) in order to transmit pressure forces. A muffler (1) is provided having such a particle filter (2), wherein a section of a muffler housing (3) of the muffler (1) forms the housing (4) of the particle filter (2).