JP7187250B2 - Exhaust gas aftertreatment system and method for exhaust gas aftertreatment - Google Patents

Description

The present invention relates to exhaust gas aftertreatment systems. Furthermore, the invention relates to a method for exhaust gas aftertreatment.

From practice, at least one further exhaust gas aftertreatment assembly arranged upstream of the particle filter, seen in the direction of flow of the exhaust gas, and/or downstream of the particle filter, seen in the direction of flow of the exhaust gas, as exhaust gas aftertreatment assembly. Exhaust gas aftertreatment systems for internal combustion engines are known that include at least one further exhaust gas aftertreatment assembly. An exhaust gas aftertreatment assembly arranged upstream of the particle filter, seen in the direction of flow, is in particular an oxidation catalytic converter that oxidizes nitric oxide (NO) to nitrogen dioxide (NO ₂ ). An exhaust gas aftertreatment assembly arranged downstream of the particle filter, seen in the direction of flow, can be a silencer. In particular, if, viewed in the flow direction of the exhaust gas stream, the oxidation catalytic converter for the oxidation of NO to NO ₂ is arranged upstream of the particulate filter, the conversion of NO to NO ₂ in the oxidation catalytic converter The oxidation of is given by the following formula:
2NO+ _O2 → _2NO2
, with the help of residual oxygen O ₂ contained in the exhaust gas stream.

During this oxidation of nitric oxide to nitrogen dioxide, the equilibrium of the oxidation reaction at elevated temperatures is on the side of nitric oxide. This means that the proportion of nitrogen dioxide that can be achieved at high temperatures is very limited.

In the particle filter, the nitrogen dioxide obtained in the oxidation catalytic converter is converted into carbon monoxide (CO), carbon dioxide (CO ₂ ), nitrogen (N ₂ ), and nitric oxide (NO). In the process, continuous removal of carbon-containing particulate matter or soot that accumulates within the particulate filter occurs due to passive regeneration of the particulate filter, this conversion being expressed by the following equation:
_2NO2 +C→2NO+ _CO2
NO2 +C→NO+CO
2C+ _2NO2 → _N2 + _2CO2
happens according to

In particular, if such passive regeneration of the particulate filter cannot result in complete conversion of the carbon-containing particulate matter or soot that accumulates within the particulate filter, the carbon or soot percentage within the particulate filter increases, The particulate filter then tends to clog, as a result of which finally the so-called exhaust gas back pressure to the internal combustion engine connected upstream of the exhaust gas aftertreatment system increases. An increase in exhaust gas back pressure to the internal combustion engine reduces the power output of the internal combustion engine and causes an increase in fuel consumption.

In order to avoid the build-up of carbon-containing particulate matter or soot in the particle filter and thus clogging of the particle filter, it is already known from practice to provide the particle filter with a catalytic coating. Platinum-containing coatings are preferentially used here. However, the use of such particle filters with a catalytic coating prevents the filling of the particle filter with carbon-containing particulate matter, ie soot, only to an insufficient extent.

In particular, if the internal combustion engine in which the exhaust gas aftertreatment system is operating operates on highly sulfur-containing fuels such as heavy fuel oil, as is usually the case with diesel internal combustion engines on ships, ash and soot A further problem exists that as a result of the high degree of occurrence, clogging of the particulate filters of the exhaust gas aftertreatment system can likewise occur. In particular, in the case of internal combustion engines running on heavy oil, the ash and soot produced can shorten the maintenance interval of the particle filter so significantly that practical work on the exhaust gas aftertreatment system is no longer possible. be.

For the above reasons, it is therefore already known from practice to replace the particle filter in the exhaust gas aftertreatment system with a filter-free particle separator. In the case of a particle separator, the exhaust gas does not flow through any filter media, and the exhaust gas stream is directed and deflected along a textured surface to separate particles.

A method for separating particles from the exhaust gas of an internal combustion engine is known from US Pat. Diffusion within the stagnant zone of the flow separates the particles. Separation of particles _from the exhaust gas by diffusion is readily possible according to methods known from US Pat. The problem is that it is often not possible. For this reason, particle separators must store particles until adequate _NO2 for later carbon oxidation is available. However, the particle filter should not clog during the process.

A further particle separator is known from US Pat. In this particle separator the exhaust gas is also continuously deflected in order to separate particles from the exhaust gas.

EP 1072765 German Patent Application No. 102008029520

Exhaust gas with a particle separator, in which the separated particles, in particular carbon particles, can be intermediately stored for later oxidation and soot and ash can be discharged to avoid clogging of the particle separator. An aftertreatment system is required. Proceeding from this, the present invention is based on the object of creating a new type of exhaust gas aftertreatment system and a new type of method for exhaust gas aftertreatment.

This object is solved by an exhaust gas aftertreatment system according to claim 1. The exhaust gas aftertreatment system includes at least one particle separator module for removing soot and ash particles from the exhaust gas, and the exhaust gas to be cleaned is sent to the particle separator via at least one exhaust gas feed line. and the exhaust gas cleaned in the particle separator can be discharged from the particle separator via at least one exhaust gas discharge line, each particle separator module comprising: including a plurality of flue gas flow paths through which the flue gas may flow, through which the flue gas exiting the flue gas delivery line may be directed in the direction of the flue gas discharge line, the flue gas flow channels being delimited by adjacent flow control elements; wherein the flow control element delimits macroscopic structures within the exhaust gas flow path, such as areas of drift with exhaust gas turbulence and/or areas of stagnant flow and/or areas of flow with varying flow velocities, Each particle separator module includes a plurality of cleaning passages through which the exhaust gas and/or compressed air may flow, the plurality of cleaning passages extending transversely to the exhaust gas flow path, and the plurality of is likewise delimited by the flow control element, and at least within such portion of the flow control element that separates the exhaust gas flow path from the cleaning passage, flow through the cleaning passage recesses are introduced for the passage of the exhaust gas to be discharged and/or for the passage of compressed air flowing through the cleaning passages, the surface of the flow control element facing the exhaust gas flow path Via the recesses it can be cleaned of soot and/or ash.

In the case of the particle filter of the exhaust gas aftertreatment system according to the invention, the carbon particles can be intermediately stored for oxidation and the ash and soot can be discharged to avoid clogging of the particle filter. . Carbon particles are separated by diffusion and/or convection of the particles on the surface of the exhaust gas flow path. Ash and soot can be effectively removed from the particle filter by cleaning passages through which compressed air and/or exhaust gas can be directed.

According to a further development, the surface of the flow control element facing the exhaust gas flow path forms a microscopic structure. Preferentially, the microscopic structure extends the effective surface area of the macroscopic structure, the microscopic structure preferentially having a roughness between 0.05 μm and 50 μm. Microscopic structures on the surface of the flow control element, facing the exhaust gas flow path, improve the separation of particles from the exhaust gas by diffusion and/or convection. Here, a microstructural roughness between 0.05 μm and 50 μm is particularly suitable for forming a thin stagnant boundary film of separated particles, which tends to have a flow velocity of zero. Thus, it can be avoided that the particles are freed again by the flow.

According to a further development, the flow control elements include flat or two-dimensionally formed flow control elements and contoured or three-dimensionally formed flow control elements, which are sandwich-like or laminated. are designed to alternate in a similar manner to form multiple layers of flue gas channels and cleaning channels. Preferentially, as a macroscopic structure, the flow control element formed in three dimensions has a flow-conducting profile extending in the direction of the exhaust gas flow path and a A laterally extending flow-accumulating contour and a flow diverting opening are formed.

Flow control elements sandwich-like or stacked-like on top of each other forming or delimiting the exhaust gas channel and the cleaning channel separate the carbon particles by diffusion and/or convection. and for cleaning particle filters of ash and soot.

According to a further advantageous further development, the flow control element has a wall thickness of between 40 and 150 μm, preferably between 40 and 100 μm, particularly preferably between 40 and 60 μm. Such thin wall thickness of the flow control element allows effective flow control, effective separation of carbon particles and effective cleaning of the particle separator in each case with a compact design. .

A method for exhaust gas aftertreatment according to the invention is defined in claim 13 .

Advantageous further developments of the invention result from the subclaims and the following description. Exemplary embodiments of the invention are explained in more detail by means of the drawings, without being restricted thereto.

1 is a block diagram of an exhaust gas aftertreatment system; FIG. FIG. 2 is a view of a detail of FIG. 1; FIG. 3 is a view of a detail of FIG. 2;

The present invention relates to an exhaust gas aftertreatment system for internal combustion engines, preferentially for internal combustion engines used on board ships, operating on highly sulfur-containing fuels, such as heavy oil.

FIG. 1 shows an exemplary embodiment of an exhaust gas aftertreatment system 2 arranged downstream of an internal combustion engine 1 . The exhaust gas aftertreatment system 2 of FIG. 1 includes a particle separator 3 arranged downstream of the internal combustion engine.

Here, both upstream of the particle separator 3, seen in the direction of flow of the exhaust gas, and also downstream of the particle separator 3, seen in the direction of flow of the exhaust gas, there is at least one further exhaust gas aftertreatment component of the exhaust gas aftertreatment system. It is pointed out that it can be arranged in each case. Upstream of the particle separator 3 an oxidation catalytic converter may be arranged for the oxidation of NO to _NO2 , for example. Downstream of the particle separator 3, for example, a muffler can be arranged.

The exhaust gas 4 to be cleaned can be fed to the particle separator 3 via an exhaust gas feed line, not shown in detail.

After the exhaust gas to be cleaned has flowed through the particle separator 3, the cleaned exhaust gas 5 preferentially passes through the particle separator 3 via at least one exhaust gas discharge line, which is likewise not shown in detail. can be discharged from

In the block diagram of FIG. 1, particle separator 3 includes two particle separator modules 6. In FIG. These two particle separator modules 6 shown in FIG. 1 are connected in parallel.

It is hereby noted that to such particle separator modules 6 connected in parallel, additionally or alternatively the particle separator 3 may also comprise particle separator modules 6 connected in series. pointed out in

Each particle separator module 6 of the particle separator 3 allows the exhaust gas to flow through (see FIGS. 2 and 3), and the exhaust gas coming out of the exhaust gas feed line passes through in the direction of the exhaust gas discharge line. It includes a plurality of exhaust gas flow paths 10 that can be directed to. Said channel 10 is preferentially metal and/or ceramic and/or quartz-containing and/or glass-containing and/or silicon-containing and/or silica-containing adjacent flow control elements 8, 9 The adjacent flow control elements are within the exhaust gas flow path 10 macroscopic structures in the millimeter (mm) size range or in the centimeter (cm) size range, in particular exhaust gas turbulence Forming or delimiting areas of drift with flow and/or areas of stagnation of flow and/or areas of varying flow velocities. In addition to the exhaust gas flow path 10, particularly in the area of the particle separator module 6 where the carbon particles are separated by diffusion and/or convection, each particle separator module 6 is in each case equipped with an exhaust gas and/or It includes a plurality of cleaning passages 11 through which compressed air can flow, extending transversely to the exhaust gas flow path 10 and also delimited by flow control elements 8,9.

Some or part of the flow control elements 8, 9 are correspondingly delimited on the one hand on the first side of the exhaust gas flow path 10 and on the one on the second side of the cleaning passage 11. there is Such flow elements 8, 9 or at least such portions of the flow control elements 8, 9 which separate the exhaust gas flow path 10 on the one hand and the cleaning passage 11 on the other hand from each other have cleaning passages 11. Recesses are introduced for the passage of the exhaust gas flowing through and/or the compressed air flowing through the cleaning passages 11, so that the exhaust gases and/or the compressed air flowing through the cleaning passages 11 pass through these. The surfaces or surface portions of the flow control elements 8, 9, which flow through the recesses and thus face the exhaust gas flow path 10, are cleaned of soot and/or ash so that they face the exhaust gas flow path 10. The surfaces or surface portions of the flow control elements 8, 9, which are in contact, can be cleaned of soot and/or ash by the recesses.

The flow control elements 8, 9 comprise on the one hand a flat plate-like and thus two-dimensionally formed flow control element 8 and on the other hand an undulating and therefore three-dimensionally embodied flow element 9. , which are alternately arranged on top of each other in a sandwich-like or stacked-like manner, as is evident from FIGS. That is, a plurality of layers of the exhaust gas passage 10 and the cleaning passage 11 are formed.

The flow control elements 8, 9 in this case preferentially have a wall thickness between 40 and 150 μm, preferably between 40 and 100 μm, particularly preferably between 40 and 60 μm, and The result is a correspondingly thin film-like formation.

Also, the flow control elements 8, 9 may be embodied as extended metal layers or grid-like.

The three-dimensionally formed flow control element 9 is in this case as a macroscopic structure a guide contour 12 extending in the direction of the exhaust gas channel 10 and a It forms a flow collection profile 13 extending into the rim, as well as a flow diverting opening 14 in which turbulent flow is normally formed. The three-dimensionally formed flow control element 9 can be a contoured extended metal layer.

In each case, a two-dimensionally formed flow control element 8 separates two adjacent three-dimensionally formed flow control elements 9 from each other and, as a macroscopic structure, forms a flow guide opening 15. is doing. The two-dimensionally formed flow control element 8 can be a smooth extended metal layer.

exhaust gas flowing through the exhaust gas channel 10 of a layer and accumulating in the area of the flow accumulation profile 13 of this layer passes through the diverting opening 14 into another exhaust gas channel 10 in the adjacent layer, or into the exhaust gas channel 10 of the same layer via the openings 14 of the subsequent cleaning channel 11 and the subsequent diverting profile 12, the exhaust gas in the area of this exhaust gas channel It can then flow again to some extent in the direction of the exhaust gas discharge line until it re-enters the region of the following flow accumulation profile 13 .

This subsequent flow collecting profile 13 allows the exhaust gases to pass through the openings 14 into the diversion channels 10 of the adjacent layers or through the subsequent cleaning channels 11 and openings 14 of the subsequent diversion profiles 12. It is made to flow again into the exhaust gas channel 10 in the same layer.

Therefore, the exhaust gas flowing through the diversion channel 10 does not flow through any filter media, and the exhaust gas is deflected multiple times, in the process, in particular of the flow accumulation profile 13, in which areas of flow stagnation occur. Within the region, particles may separate by diffusion and/or convection.

In order to facilitate the separation of particles from the exhaust gas by diffusion and/or convection, the microscopic structure preferentially builds up a roughness between 0.05 μm and 50 μm in the region of these surfaces, thereby macroscopically are formed on the flow control elements 8, 9, ie on the surfaces or surface portions of the flow control elements 8, 9 facing the diversion channel 10, in order to extend the effective surface area of the target structure. That is, structures within the range of micrometers (μm).

Specifically, when the roughness of the microstructure is between 0.05 μm and 50 μm, a thin stagnant boundary film can form within the region of the macroscopic structure, where the flow velocity tends to zero. be. This prevents particles separated in the region of the rough surface from being liberated again by the exhaust gas stream.

Specifically, the microscopic structures that can be formed within the region of the flow-accumulating macroscopic structures can be formed by machining and/or chemical treatment of each surface.

Therefore, by brushing and/or grinding and/or scraping and/or blasting and/or stamping and/or needling, the surface roughness is adjusted on the surface of the macroscopic structure and the microscopic structure is then formed as a structure to be brushed and/or a structure to be ground and/or a structure to be scraped and/or a structure to be peened and/or a structure to be stamped and/or a structure to be needled. It is possible to form In addition, chemical treatments such as etching and/or galvanizing and/or anodizing can form microscopic structures, such that the microscopic structures are then formed into etched structures and/or It is formed as a galvanized structure and/or an anodized structure. Additionally, a corona treatment of the surface to form microscopic structures can be performed.

Furthermore, a preferential metal alloying of the flow control elements 8, 9 can be applied, so that their surface structure changes under the influence of heat and/or changes in the ph value. change with

An example of this is the introduction of aluminum into the alloy of the flow control elements 8,9. At high temperatures, aluminum migrates to the surface where it forms aluminum clusters. The alloying material for the flow control element can be selected such that the surface can be easily corroded or oxidized.

Due to the oxidizing and corrosive atmosphere of the exhaust gas, it is thus possible during operation of the internal combustion engine to increase the roughness of the surface in the region of the exhaust gas channel 10 . Even after a short run-in phase this works well so that mechanical or chemical treatment of the surface of the flow control element can be omitted.

It is also possible to apply a metal powder with subsequent fixing of the powder to the flow control element by soldering or sintering to form a defined microscopic structure with a defined roughness. be.

As already explained, the flow control element 9 is three-dimensionally formed. In addition to this, the flow control element 9 may be corrugated and/or foldable.

In particular, the surfaces of the flow control elements 8, 9 facing the exhaust gas flow path 10 and serving for particle separation by diffusion and/or convection, forming the flow accumulation profile 13, are effectively For cleaning, recesses have been introduced into the portion of the flow control elements 8, 9, particularly by perforations or slits, in which exhaust gases and/or compressed air flowing through the cleaning passages 11 are Through the recess, it is directed into the exhaust gas channel 10, thus removing soot and/or ash from the surface.

The cleaning channel 11 extends in this case transversely to the exhaust gas channel 10, in particular the cleaning channel 11 forms an angle between 20° and 160° with the exhaust gas channel 10. , preferably an angle between 50° and 120°, particularly preferably an angle between 80° and 100°, in particular an angle of 90°. Here, the cleaning passage 11 preferentially directs the exhaust gas conducted through the cleaning passage 11 or the compressed air conducted through the cleaning passage 11 through the recess or perforation to the flow control element 8, It is closed at one end to lead into the corresponding part of 9.

The dimensions of the macroscopic structures are preferentially in the range of millimeters or centimeters and thus several times larger than the dimensions of the largest particles to be separated. The macroscopic openings for flow are arranged preferentially so that they promote the formation of turbulence. Furthermore, the formation of flow stagnation zones is promoted. Regions with varying flow velocities are created.

The flow control elements 8, 9 of each particle separator module 6 are enclosed within a canister to provide each particle separator module 6 in this manner. A plurality of particle separator modules 6 may be arranged in a common housing 17 forming parallel and/or series connections of particle separator modules 6 . FIG. 1 shows very schematically such a housing 17 for a plurality of particle separator modules 6 and a canister 16 for each particle separator module 6 . The particle separator modules 6 are preferentially arranged within the common housing 17 in such a way that the particle separator modules 6 can be removed from the housing 17 in a non-destructive manner.

The canister 16 allows adjacent particle separator modules 6 to be sealed against each other by profiles that are inserted into each other, for example based on the key-locking principle with the taper and cone of the canister 16 .

The housing 17 of the particle separator 3 allows the particle separator module 6 to both be supplied with the exhaust gas to be cleaned and to be discharged via the housing 17 with the cleaned exhaust gas. be. Compressed air led through the cleaning passage 11 of the particle separator module 6 can also be supplied to it through the housing 17 of the particle separator 3 . Here, a recovery chamber, namely a recovery chamber for the exhaust gas and a recovery chamber for the compressed air, is formed in the housing for directing the exhaust gas and the compressed air coming from this recovery chamber in the direction of the exhaust gas channel 10 and the cleaning channel 11. can be Compressed air directed through cleaning passage 11 is preferentially forwarded from particle separator module 6 to particle separator module 6 .

In the exhaust gas aftertreatment, preferentially the exhaust gas channel 10 and the cleaning channel 11 are not flowed through at the same time. In particular, in particular when the exhaust gas aftertreatment system comprises two or more particle separators 3, and in particular the first particle separator 3 is used for cleaning the exhaust gas, in the process of which the exhaust gas is It is provided that the second particle separator 3 is cleaned when it is led through the exhaust gas channel 10 and for this purpose the exhaust gas and/or the compressed air are led through its cleaning channel 11, In the area of the particle separator 3 of 2, the exhaust gas flow through its exhaust gas channel 10 then preferentially stops completely or is reduced.

Further, the method is characterized in that during the cleanup stage in which the soot and ash are swirled, the extraction of these swirled solids from the particle separator 3 and their subsequent recovery in a suitable vessel are carried out. can be improved. It can be emptied at any time.

In order to produce a particle separator according to the invention flow control elements 8, 9 are provided and the microscopic structures on the flow control elements 8, 9 can be formed either before or after the formation of the macroscopic structures. .

The formation of microstructures is preferentially blasting and/or grinding and/or stamping and/or needling and/or etching and/or galvanizing and/or anodizing and/or brushing and/or This is achieved by corona irradiation or the like.

To manufacture the particle separator module 6, the procedure is such that the basic body of the flow control elements 8, 9 is first micronized by blasting and/or grinding and/or stamping and/or needling and/or etching of particles. A visual structure may be provided. Following this, a macroscopic structure is formed by molding or soldering or welding, thus forming a three-dimensionally formed flow control element 9 . By stamping or drilling, the openings 14, 15 forming the connection of adjacent exhaust gas channels 10 can be produced in the finished installation state. This is followed by a stacking of the flow control elements 8, 9, preferentially alternating with two-dimensionally formed flow control elements 8 and three-dimensionally formed flow control elements 9 layered on top of each other. It is formed by Specifically, such stacks can be formed into an approximately cylindrical body, preferentially perpendicular to the direction in which the exhaust gas flow path extends, by twisting them in an S-shape. Such a body may be placed within canister 16 . Laminated or cylindrical flow control elements 8, 9 arranged on top of each other may be permanently joined together, for example by welding or soldering. Also, the microscopic structures can be formed subsequent to the completion of the macroscopic structures. The stack formed by stacking flow control elements 8, 9 to form a microscopic structure is microscopically deposited on all surfaces by immersion in an etchant and subsequent removal of the etchant. A structure can be provided.

1 internal combustion engine
2 Exhaust gas aftertreatment system
3 Particle separator
4 Cleaned exhaust gas
5 Cleaned exhaust gas
6 Particle separator module
7 Compressed air
8, 9 flow control element
10 Exhaust gas flow path
11 Purification Passage
12 Conductor profile
13 Flow Accumulation Profile
14, 15 Diversion openings
16 Canister
17 Housing

Claims (13)

Said internal combustion engine (1) having a particle separator (3) arranged downstream of the internal combustion engine (1), consisting of at least one particle separator module (6) for removing soot and ash particles from the exhaust gas. An exhaust gas aftertreatment system (2) for an engine (1), comprising:
The exhaust gas to be cleaned can be fed to the particle separator (3) via at least one exhaust gas feed line, in which the cleaned exhaust gas can be discharged from said particle separator (3) via at least one exhaust gas discharge line,
each said particle separator module (6) comprises a plurality of exhaust gas flow paths (10) through which said exhaust gas is capable of flowing; the exhaust gas emerging from the exhaust gas delivery line can be directed in the direction of the exhaust gas discharge line;
Said exhaust gas flow path (10) is bounded by adjacent flow control elements (8, 9), said adjacent flow control elements being biased within said exhaust gas flow path (10) with exhaust gas turbulence. delimiting macroscopic structures such as basins and/or areas of stagnation and/or areas of flow with varying flow velocities;
Each particle separator module (6) comprises a plurality of cleaning passages (11) through which the exhaust gas and/or compressed air can flow, and the plurality of cleaning channels. a passageway extending transversely to said exhaust gas flow path (10) and said plurality of cleaning passageways being similarly delimited by said flow control elements (8, 9);
of said exhaust gases flowing through said cleaning passages (11) within at least such portions of said flow control elements (8, 9) separating said exhaust gas flow paths (10) from said cleaning passages (11); said flow control element (8 , 9) is cleaned of soot and/or ash via said recesses ,
characterized in that the ash particles and the soot particles swirled in the cleaning stage of the particle separator module (6) are extracted from the particle separator module (6) and collected in a container, Exhaust gas aftertreatment system . 2. Exhaust post-gas according to claim 1, characterized in that the surfaces of the flow control elements (8, 9) facing the exhaust gas flow path (10) form a microstructure. processing system. Said microscopic structure is a structure to be ground and/or a structure to be stamped and/or a structure to be needled and/or a structure to be brushed and/or a structure to be peened and/or an etched structure and/or anodized structure and/or 3. The exhaust gas aftertreatment system according to claim 2, characterized in that it is formed as a galvanized structure. 4. An exhaust gas aftertreatment system according to claim 2 or 3, characterized in that said microstructures have a roughness of between 0.05 [mu]m and 50 [mu]m. 5. An exhaust gas aftertreatment system according to any one of claims 2 to 4, characterized in that said microscopic structures extend the effective surface area of said macroscopic structures. 6. Exhaust gas according to any one of the preceding claims, characterized in that the cleaning passage (11) and the exhaust gas flow path ( 10 ) comprise an angle between 20[deg.] and 160[deg.]. aftertreatment system. Said flow control elements (8, 9) include a two-dimensionally formed flow control element (8) and a three-dimensionally formed flow control element (9), these flow control elements being sandwiched from claim 1, characterized in that they are designed to alternate in a single or layered manner and form a plurality of layers of said exhaust gas channels (10) and said cleaning channels (11). 7. The exhaust gas post-treatment system according to any one of 6 . 8. Exhaust gas aftertreatment system according to claim 7 , characterized in that the flow control elements (8, 9) have a wall thickness between 40 [mu]m and 150 [mu]m. The three-dimensionally formed flow control element (9) as the macroscopic structure has a guiding contour (12) extending in the direction of the exhaust gas channel and 9. Exhaust gas aftertreatment system according to claim 7 or 8 , characterized in that it develops into a flow collecting profile (13) extending transversely to it and into a diverting opening (14). 10. The method according to any one of claims 7 to 9 , characterized in that the two-dimensionally formed flow control element (8) as macroscopic structure forms a flow guide opening (15). 11. An exhaust gas aftertreatment system according to paragraph 1. 11. An exhaust gas aftertreatment system according to any one of the preceding claims, characterized in that the flow control elements (8, 9) of each particle separator module ( 6 ) are enclosed by a canister. . 12. The method according to any one of claims 1 to 11 , characterized in that a plurality of particle separator modules (6) are arranged in a common housing where they are connected in parallel and/or in series. Exhaust gas aftertreatment system. Method for exhaust gas aftertreatment of exhaust gases leaving an internal combustion engine, comprising a particle separator, in which an exhaust gas aftertreatment system (2) according to any one of claims 1 to 12 is connected in parallel. (3), if a first particle separator (3) is utilized for cleaning said exhaust gas and in said process said exhaust gas is directed through said exhaust gas flow path (10) thereof, a second is cleaned, for this purpose said exhaust gas and/or flowing compressed air is led through said cleaning passages (11) thereof, said process in said second particle separation A method for exhaust gas aftertreatment, wherein the exhaust gas flow through the exhaust gas flow path (10) of the machine is reduced or blocked.

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